Bump all dependencies

Reviewed-on: dsprenkels/rushlink#72

.gitignore

@@ -14,8 +14,12 @@
 # Dependency directories (remove the comment below to include it)
 # vendor/
 
-# Generated code from assets using bindata
-bindata.go
-
 # Output binary
 /rushlink
+
+# Any kind of backup files
+*~
+*.bak
+
+# Visual Code local config directory
+.vscode

README.md

@@ -2,6 +2,57 @@
 
 A URL shortener and (maybe) a pastebin server for our #ru community.
 
+## Building
+
+- `go get -u github.com/go-bindata/go-bindata/...`
+- `go generate ./...`
+- `go build ./cmd/rushlink`
+
+## Deploying
+
+We recommend running `rushlink` behind a reverse proxy suitable for processing
+HTTP requests, such as `nginx`, or `haproxy`.
+
+## Sample `nginx` config
+
+```
+server {
+    location / {
+        root    /var/www/rushlink;
+        proxy_pass http://127.0.0.1:8000;
+        proxy_set_header Host rushlink.local;
+        proxy_set_header X-Forwarded-For $remote_addr;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_http_version 1.1;
+    }
+}
+```
+
+`rushlink` automatically detects whether `http` or `https` is used when
+`X-Forwarded-Proto` is correctly set. Otherwise, pass `-root_url
+https://rushlink.local` to the binary (e.g. in the `systemd` unit file).
+
+## Sample `systemd` unit file
+
+As of 1fe9553cc9, `rushlink` expects its database and file store configuration
+in environment variables.
+
+```
+[Install]
+WantedBy=nginx.service
+
+[Service]
+Type=simple
+User=rushlink
+Group=nogroup
+Environment=RUSHLINK_DATABASE_DRIVER=sqlite RUSHLINK_DATABASE_PATH=/var/lib/rushlink/rushlink.sqlite3 RUSHLINK_FILE_STORE_PATH=/var/lib/rushlink/filestore/
+ExecStart=/var/lib/rushlink/rushlink -root_url https://rushlink.local
+```
+
+---
+
+# Background
+
 ## Libraries
 
 Use standard-Go-libraries if the job can be done with those. As of now, these
@@ -18,10 +69,16 @@ are the exceptions:
 
 ## Database
 
-We will be using [`go.etcd.io/bbolt`]. This file should be the *only* file
+Before 1fe9553cc9 we used [`go.etcd.io/bbolt`]. This file should be the *only* file
 apart from our monolithic binary. All settings and keys should go in here.
 Any read-only data resides in the binary file (possibly compressed).
 
+Now, we use Gorm and support SQLite and PostgreSQL as backends.
+
+We provide a migration binary in `cmd/rushlink-migrate-db/`. In environment
+variables, the destination database is configured, and the binary itself
+expects a few flags. Refer to the source for the exact flags.
+
 [`go.etcd.io/bbolt`]: `go.etcd.io/bbolt`
 
 ## Namespacing

assets/css/main.css

@@ -0,0 +1,34 @@
+body {
+    font-family: monospace;
+}
+
+#dropZone {
+    background-color: rgba(0, 0, 0.2, 0.75);
+    color: white;
+    font-size: 60px;
+    font-weight: bold;
+    height: 100%;         
+    left: 0; 
+    padding: 1em;
+    position: fixed;
+    top: 0;
+    transition: visibility 175ms, opacity 175ms;
+    width: 100%;
+    z-index: 999;               
+}
+
+pre {
+    padding-left: 4ex; /* approx 4 monospaced spaces */
+}
+
+.success {
+    color: #008000;
+}
+
+.fail {
+    color: #800000;
+}
+
+.hidden {
+    display: none;
+}

assets/js/copyclipboard.js

@@ -0,0 +1,51 @@
+"use strict";
+
+const COPY_TO_CLIPBOARD_CONTAINER_ID = "copyToClipboardContainer";
+const COPY_TO_CLIPBOARD_STATUS_ID = "copyToClipboardStatus";
+let copyToClipboardCtr = 0;
+
+function copyToClipboardSuccess() {
+    let statusElem = document.getElementById(COPY_TO_CLIPBOARD_STATUS_ID);
+    statusElem.innerText = "URL copied!";
+    statusElem.classList.remove("fail");
+    statusElem.classList.add("success");
+}
+
+function copyToClipboardFail(cause) {
+    let statusElem = document.getElementById(COPY_TO_CLIPBOARD_STATUS_ID);
+    if (!cause) cause = "unknown error";
+    let msg = "copy failed: " + cause;
+    console.log(msg);
+    statusElem.innerText = msg;
+    statusElem.classList.remove("success");
+    statusElem.classList.add("fail");
+}
+
+function copyToClipboard(url) {
+    let copyEventIdx = ++copyToClipboardCtr;
+
+    if (!window.navigator.clipboard) {
+        copyToClipboardFail("could not access clipboard");
+        return;
+    }
+    window.navigator.clipboard.writeText(url).then(() => {
+        if (copyToClipboardCtr !== copyEventIdx) return;
+        copyToClipboardSuccess();
+    }, () => {
+        if (copyToClipboardCtr !== copyEventIdx) return;
+        copyToClipboardFail();
+    });
+}
+
+(function () {
+    if (!window.navigator.clipboard) {
+        let msg = "cannot access clipboard";
+        if (window.location.protocol !== "https:") {
+            msg += ": website not using https"
+        }
+        console.error(msg);
+    } else {
+        let container = document.getElementById(COPY_TO_CLIPBOARD_CONTAINER_ID);
+        container.classList.remove("hidden");
+    }
+})();

assets/js/dragdrop.js

@@ -0,0 +1,48 @@
+"use strict";
+
+window.addEventListener('DOMContentLoaded', (event) => {
+    // The implementation of this drag-drop logic is largely based on the
+    // answer described in <https://stackoverflow.com/a/28226022/5207081>.
+    //
+    // The gist is this: every time the drag enters a new DOM object, it will
+    // fire a new 'dragenter' event on that element.  That is a pain, because
+    // we do not know which element will be the last to receive a dragleave
+    // event, in case the user aborts the process.
+    //
+    // Therefore, we use an Ugly Hack™.  There will be an element with id
+    // 'dropZone', which blocks the complete page.  When a 'dragenter' event
+    // is received on any DOM element, we will unhide this modal page-blocker.
+    // This will guarantee us that the next 'enter' event will be received on
+    // this page-block element.  This event we shall ignore.
+    //
+    // Then, whenever the user stop their drag action, we will receive the
+    // 'dragleave' on the '#dropZone' element.  Now we know when exactly
+    // a drag action is cancelled (and we will hide the modal element
+    // accordingly).
+
+    let dropZone = document.getElementById("dropZone");
+    window.addEventListener("dragenter", (event) => {
+        // User starts a drag action
+        dropZone.style.visibility = "";
+        dropZone.style.opacity = 1;
+    });
+
+    dropZone.addEventListener("drop", (event) => {
+        // User drops a file
+        event.preventDefault();
+        document.getElementById("fileUploadField").files = event.dataTransfer.files;
+        document.getElementById("fileUploadForm").submit();
+    });
+
+    dropZone.addEventListener("dragleave", (event) => {
+        // User cancels drag action
+        dropZone.style.visibility = "hidden";
+        dropZone.style.opacity = 0;
+    });
+
+    window.addEventListener("dragover", (event) => {
+        // Prevent the browser from opening the file, because of a drop event
+        // on the window.  (<https://stackoverflow.com/a/6756680/5207081>)
+        event.preventDefault();
+    });
+});

assets/templates/html/base.html.tmpl

@@ -2,7 +2,9 @@
 <html>
     <head>
         <meta charset="utf-8">
-        <title>{{block "title" .}}rushlink{{end}}</title>{{block "head-append" .}}{{end}}
+        <title>{{block "title" .}}rushlink{{end}}</title>
+        <link rel="stylesheet" type="text/css" href="/css/main.css" />
+        {{block "head-append" .}}{{end -}}
     </head>
     <body>
         {{block "body" .}}

assets/templates/html/index.html.tmpl

@@ -1,20 +1,47 @@
-{{define "body"}}
-<pre>
-#RU URL SHORTENER
-=================
+{{define "head-append"}}
+<script type="text/javascript" src="/js/dragdrop.js" defer></script>
+{{end}}
 
-Based on https://0x0.st/, this site allows you to easily shorten URLs using
+{{define "body"}}
+<div style="visibility:hidden; opacity:0" id="dropZone">File incoming! :D</div>
+<h1>#RU paste-dump</h1>
+
+Based on https://0x0.st/, this site allows you to easily upload files and shorten URLs using
 the command line.
 
-## USAGE
+<h2>Web-API</h2>
+<section>
+    <form id="fileUploadForm" action="/" method="post" enctype="multipart/form-data">
+        <label class="formLabel" for="fileUploadField">Upload a file:</label>
+        <input id="fileUploadField" class="formMain" name="file" type="file" />
+        <input id="fileUploadField" class="formSubmit" type="submit" value="upload!" />
+    </form>
+</section>
+<section>
+    <form id="shortenURLForm" action="/" method="post" enctype="multipart/form-data">
+        <label class="formLabel" for="shortenURLField">Upload a URL:</label>
+        <input id="shortenURLField" class="formMain" name="shorten" type="url" />
+        <input id="shortenURLSubmit" class="formSubmit" type="submit" value="shorten!" />
+    </form>
+</section>
 
-    # Upload a file
-    curl -F'file=@yourfile.png' <a href="{{.Request.Host}}">{{.Request.Host}}</a>
+<h2>Command line API</h2>
+<pre>
+# Upload a file
+curl -F'file=@yourfile.png' <a href="{{.RootURL}}">{{.RootURL}}</a>
 
-    # Shorten a URL
-    curl -F'shorten=http://example.com/some/long/url' <a href="{{.Request.Host}}">{{.Request.Host}}</a>
+# Shorten a URL
+curl -F'shorten=http://example.com/some/long/url' <a href="{{.RootURL}}">{{.RootURL}}</a>
 
-    # Shorten a URL with a token to delete it later
-    curl -F'shorten=http://example.com/some/long/url' -F'deleteToken=' <a href="{{.Request.Host}}">{{.Request.Host}}</a>
+# The first line of the result will contain the shortened URL.
+#
+# In the other lines, you will find other information, including
+# information on how to delete the shortened object.
+
+# Upload output from another process
+figlet Rushlink | curl -F'file=@-' <a href="{{.RootURL}}">{{.RootURL}}</a>
+
+# To upload a file and only extract the shortened URL (i.e. throw away the rest)
+curl -F'file=@yourfile.png' <a href="{{.RootURL}}">{{.RootURL}}</a> | head -n 1
 </pre>
-{{end}}
+{{end}}

assets/templates/html/newRedirectPasteSuccess.html.tmpl

@@ -1,3 +0,0 @@
-{{define "title"}}
-Success - rushlink
-{{end}}

assets/templates/html/pasteMeta.html.tmpl

@@ -1,3 +1,45 @@
 {{define "title"}}
-'{{.Paste.Key}}' meta info - rushlink
-{{end}}
+'{{.Paste.Key}}{{.FileExt}}' metadata - rushlink
+{{end}}
+
+{{define "head-append"}}
+<script type="text/javascript" src="/js/copyclipboard.js" defer></script>
+{{end}}
+
+{{define "body"}}
+<pre id="copyToClipboardContainer" class="hidden">
+<button onclick="copyToClipboard('{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}')">Copy URL to clipboard</button> <span id="copyToClipboardStatus"></span>
+</pre>
+<pre>
+<a href="{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}">{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}</a>
+---
+{{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}
+with delete token: <a href="{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}">{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}</a>
+{{else -}}
+with delete token: &lt;unknown&gt;
+{{end -}}
+type: {{.Paste.Type}}
+state: {{.Paste.State}}
+{{if .Paste.CreatedAt.IsZero -}}
+created: unknown
+{{else -}}
+created: {{.Paste.CreatedAt}}
+{{end -}}
+{{if .Paste.UpdatedAt.IsZero -}}
+last updated: unknown
+{{else -}}
+last updated: {{.Paste.UpdatedAt}}
+{{end -}}
+{{if .Paste.DeletedAt.Valid -}}
+deleted at: {{.Paste.DeletedAt.Time}}
+{{end -}}
+delete token: {{.CanDeleteString}}
+<form action="delete?deleteToken={{.Paste.DeleteToken}}" method="post">
+<input type="submit" name="delete" value="Delete paste"
+{{- if or (eq .Paste.State.String "deleted") (not .CanDeleteBool) -}}
+disabled
+{{- end -}}
+>
+</form>
+</pre>
+{{end}}

assets/templates/txt/index.txt.tmpl

@@ -6,11 +6,19 @@ the command line.
 
 ## USAGE
 
-    # Upload a file
-    curl -F'file=@yourfile.png' {{.Request.Host}}
+# Upload a file
+curl -F'file=@yourfile.png' {{.RootURL}}
 
-    # Shorten a URL
-    curl -F'shorten=http://example.com/some/long/url' {{.Request.Host}}
+# Shorten a URL
+curl -F'shorten=http://example.com/some/long/url' {{.RootURL}}
 
-    # Shorten a URL with a token to delete it later
-    curl -F'shorten=http://example.com/some/long/url' -F'deleteToken=' {{.Request.Host}}
+# The first line of the result will contain the shortened URL.
+#
+# In the other lines, you will find other information, including
+# information on how to delete the shortened object.
+
+# Upload output from another process
+figlet Rushlink | curl -F'file=@-' {{.RootURL}}
+
+# To upload a file and only extract the shortened URL (i.e. throw away the rest)
+curl -F'file=@yourfile.png' {{.RootURL}} | head -n 1

assets/templates/txt/newRedirectPasteSuccess.txt.tmpl

@@ -1,5 +0,0 @@
-{{- if .Request.PostForm.deleteToken  -}}
-{{.Request.Host}}/{{.Paste.Key}}?deleteToken={{.Paste.DeleteToken | urlquery}}
-{{else -}}
-{{.Request.Host}}/{{.Paste.Key}}
-{{end -}}

assets/templates/txt/pasteMeta.txt.tmpl

@@ -1,17 +1,21 @@
-METADATA on <{{.Request.Host}}/{{.Paste.Key}}>:
-
-TYPE: {{.Paste.Type}}
-STATE: {{.Paste.State}}
-{{if .Paste.TimeCreated.IsZero -}}
-CREATED: undefined
+{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}
+---
+{{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}
+with delete token: {{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}
 {{else -}}
-CREATED: {{.Paste.TimeCreated}}
+with delete token: <unknown>
+{{end -}}type: {{.Paste.Type}}
+state: {{.Paste.State}}
+{{if .Paste.CreatedAt.IsZero -}}
+created: unknown
+{{else -}}
+created: {{.Paste.CreatedAt}}
 {{end -}}
-DELETE TOKEN: {{.CanDelete.String}}
+delete token: {{.CanDeleteString}}
 
-{{if and (ne .Paste.State.String "deleted") .CanDelete.Bool}}
+{{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}
 ```
 # To delete this {{.Paste.Type}}, execute:
-curl --request "DELETE" "{{.Request.Host}}/{{.Paste.Key}}?deleteToken={{.Request.URL.Query.Get "deleteToken"}}"
+curl --request "DELETE" "{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}"
 ```
 {{end}}

bindata.go

@@ -0,0 +1,484 @@
+// Code generated for package rushlink by go-bindata DO NOT EDIT. (@generated)
+// sources:
+// assets/css/main.css
+// assets/js/copyclipboard.js
+// assets/js/dragdrop.js
+// assets/templates/html/base.html.tmpl
+// assets/templates/html/error.html.tmpl
+// assets/templates/html/index.html.tmpl
+// assets/templates/html/pasteMeta.html.tmpl
+// assets/templates/txt/base.txt.tmpl
+// assets/templates/txt/error.txt.tmpl
+// assets/templates/txt/index.txt.tmpl
+// assets/templates/txt/pasteMeta.txt.tmpl
+package rushlink
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+func bindataRead(data []byte, name string) ([]byte, error) {
+	gz, err := gzip.NewReader(bytes.NewBuffer(data))
+	if err != nil {
+		return nil, fmt.Errorf("Read %q: %v", name, err)
+	}
+
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, gz)
+	clErr := gz.Close()
+
+	if err != nil {
+		return nil, fmt.Errorf("Read %q: %v", name, err)
+	}
+	if clErr != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+type asset struct {
+	bytes []byte
+	info  os.FileInfo
+}
+
+type bindataFileInfo struct {
+	name    string
+	size    int64
+	mode    os.FileMode
+	modTime time.Time
+}
+
+// Name return file name
+func (fi bindataFileInfo) Name() string {
+	return fi.name
+}
+
+// Size return file size
+func (fi bindataFileInfo) Size() int64 {
+	return fi.size
+}
+
+// Mode return file mode
+func (fi bindataFileInfo) Mode() os.FileMode {
+	return fi.mode
+}
+
+// Mode return file modify time
+func (fi bindataFileInfo) ModTime() time.Time {
+	return fi.modTime
+}
+
+// IsDir return file whether a directory
+func (fi bindataFileInfo) IsDir() bool {
+	return fi.mode&os.ModeDir != 0
+}
+
+// Sys return file is sys mode
+func (fi bindataFileInfo) Sys() interface{} {
+	return nil
+}
+
+var _cssMainCss = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x5c\x51\xd1\x6e\xc3\x20\x0c\x7c\xcf\x57\x58\xaa\x26\x6d\x55\xd3\xd2\xa9\x5d\x57\xf2\x27\x7b\x23\xc1\x49\xac\x11\x8c\x80\xae\x49\xa7\xfe\xfb\x94\x84\xac\xd3\x10\x02\x7c\x77\x36\x27\xbb\x64\x3d\xc0\x77\x06\x00\x50\xb3\x8d\x79\xad\x3a\x32\x83\x84\x8e\x2d\x07\xa7\x2a\x2c\xb2\x7b\x96\xad\xb4\x67\xf7\xc1\x16\x93\xb4\x54\xd5\x67\xe3\xf9\x62\x75\x5e\xb1\x61\x2f\xc1\x37\xa5\x7a\x16\x1b\x18\xf7\xf6\x75\x3c\x4e\xc7\x97\x62\x12\x27\xc5\xb5\xa5\x88\xc5\xe3\xa7\x40\x37\x94\xf0\x26\x5c\xff\x07\xbc\x22\x35\x6d\x94\x50\xb2\xd1\x33\xdc\x26\x64\x2f\xc4\x53\x01\xcb\x9a\x28\x83\x75\x94\x20\x8a\x39\x72\x4a\x6b\xb2\x8d\x84\x3d\x76\x73\xaa\xe3\x40\x91\xd8\x4a\xa8\xa9\xc7\x54\x2f\xb2\x1b\x73\xe6\xb7\x57\x76\x91\x7c\x51\xa0\x92\x0c\xc5\x01\xf6\xa7\x63\x17\x36\xc0\x4e\x55\xbf\xe1\x9c\x70\x25\x1d\xdb\xe4\x65\x02\x6e\x39\x59\x8d\xbd\x84\xf3\xf9\xfc\x70\x97\x3c\xde\xb3\xcc\xf9\xa5\x65\xc9\x5e\x3e\x9b\x3e\x60\x5f\xc0\x6e\x0d\xca\x39\xcf\x3d\x1c\x1e\xfd\xd6\x30\x5d\x01\xd6\xbb\xb1\xc0\x36\x5c\xaa\x0a\x43\x48\x55\x52\x2f\x57\x42\xbc\x0b\x21\xa6\xd9\x6c\x6b\x45\xe6\x1f\x3d\x92\x0b\xdd\x92\xd6\x68\x93\x40\x53\x70\x46\x0d\x12\x2c\xdb\x69\xb4\x3f\x01\x00\x00\xff\xff\x22\xc0\x9d\x3a\x00\x02\x00\x00")
+
+func cssMainCssBytes() ([]byte, error) {
+	return bindataRead(
+		_cssMainCss,
+		"css/main.css",
+	)
+}
+
+func cssMainCss() (*asset, error) {
+	bytes, err := cssMainCssBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "css/main.css", size: 512, mode: os.FileMode(420), modTime: time.Unix(1590859748, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _jsCopyclipboardJs = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\xb4\x54\x4f\x6b\xe3\x3e\x10\xbd\xfb\x53\x4c\x75\xb2\xc9\x0f\xf3\x3b\xd7\x78\xa1\x4d\xbb\x10\x28\x4d\x69\xdc\xc3\x9e\x82\x2a\x4d\x1c\xb1\xb2\x14\xa4\x71\xd2\xb2\xf8\xbb\x2f\xb2\xe3\xc4\xf9\xcb\xf6\x50\x1f\x12\x12\x8f\xde\xcc\x7b\x6f\x9e\x58\xed\x11\x3c\x39\x25\x88\x65\x51\x24\xac\xf1\x04\xe3\xe9\xcb\xaf\x79\x31\x9d\x8f\x9f\x26\x2f\xf7\xd3\xbb\xd7\x87\xf9\x78\xfa\x5c\xdc\x4d\x9e\x1f\x5f\xe7\x93\x07\xc8\x81\x09\xbb\xfa\x2c\xec\x58\xab\xd5\xbb\xe5\x4e\x8e\xad\x21\xae\x0c\x3a\x96\x5d\x84\x98\x15\x77\xc5\xdb\xec\xfc\xf9\x19\x71\xaa\x3d\xcb\x22\x8d\x04\xc7\xd8\xe4\x20\x87\xff\xb3\x28\x5a\xd4\x46\x90\xb2\xe6\xb8\x62\x56\x0b\x81\xde\xc7\x09\xfc\x89\x00\x00\x02\x88\x6f\x11\x1f\x35\x56\x90\x83\xb4\xa2\xae\xd0\x50\x5a\x22\x85\xbf\xd0\xd0\xfd\xe7\x44\xc6\x57\x86\x4c\xb2\x16\x6a\x0f\x93\x2a\x63\xd0\x15\xf8\x41\x61\xfe\xb7\xd7\xa7\x30\x85\x42\x79\xc3\x4e\x2a\x85\xe6\xde\x3f\x29\x4f\xa9\xc3\xca\xae\x31\x66\x0b\xae\x34\x3b\x85\xdc\x17\x72\x29\x63\xe6\x3b\x1e\xa1\xb0\xb9\xcc\xf6\x27\x57\x3a\x16\xbc\xf6\xf8\x0d\x7c\xd5\x02\xe2\x9b\x2d\x78\xfb\x15\xc8\xd6\xe6\xb7\xb1\x1b\x03\xe8\x9c\x75\x5b\xba\xa1\x67\xe5\xcb\xde\x4b\x08\x0c\x51\xde\x02\x83\x51\x77\xb0\x2b\x0b\xcb\x60\x35\xa6\xda\x96\x71\xe5\xcb\xeb\xaa\x56\xbe\xfc\x07\x2d\x07\x2a\x5d\x97\xb3\x17\xfd\x8a\x96\x71\xed\xf4\x50\xc5\xf0\xfa\x71\x8d\x86\x26\xf2\x03\x72\x18\x8d\x4e\x77\x31\x8b\xf6\x42\x6d\x94\x91\x76\x93\x1a\xbe\x56\x25\x27\xeb\x52\xd1\x17\xf6\xa0\x9d\x06\xa7\xfe\x31\x61\x6b\x2d\xc1\x58\x02\xde\xd2\x81\xdd\xd1\x9e\x58\x78\x1c\x52\xed\x4c\xf7\xbb\x69\x3f\x2f\xb7\x4c\x37\x4e\x11\x06\x29\x5b\x56\x29\x2d\xd1\xc4\x71\x02\xf9\x8f\xc1\x2c\x61\xec\x33\xf9\xba\xc9\xf3\x03\xee\xc9\x41\xe7\x33\x24\x76\x91\xdb\xce\xf6\x1f\x7c\x57\xa7\x56\xae\xbe\x4d\xe7\x66\xbc\xb3\x73\x17\xf9\x2f\xd8\x31\xdc\x5c\x6e\xce\x3a\x90\x1d\xb0\xd8\xc2\x6a\x2b\x78\x68\x9a\xae\x9c\x25\x2b\xac\x6e\xb9\xb0\x25\xd1\xca\xdf\xb2\x61\x87\xf0\x84\x0e\xa3\x1c\xd8\x2d\x6c\xf0\xdd\x2b\xc2\xd6\xeb\xda\x2b\x53\x42\x7b\x84\xed\xca\x9b\x01\xf5\x2e\x2d\x6d\xd0\x06\x79\x69\x00\xb5\xc7\x23\x0e\xa2\xbf\x73\xbf\x14\xf8\xe1\x45\x9e\x0c\x45\xdf\x82\x9d\x09\xdc\x52\x49\x89\xa6\x5f\xcb\x26\x6a\x92\xe0\xc7\xdf\x00\x00\x00\xff\xff\x70\xbd\x7a\x61\x39\x06\x00\x00")
+
+func jsCopyclipboardJsBytes() ([]byte, error) {
+	return bindataRead(
+		_jsCopyclipboardJs,
+		"js/copyclipboard.js",
+	)
+}
+
+func jsCopyclipboardJs() (*asset, error) {
+	bytes, err := jsCopyclipboardJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "js/copyclipboard.js", size: 1593, mode: os.FileMode(420), modTime: time.Unix(1590859748, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _jsDragdropJs = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x94\x95\xcd\x6e\xdb\x46\x10\xc7\xef\x7e\x8a\x01\x7b\xa0\x08\x28\x94\x22\x20\x8e\x11\xd5\x39\xb4\x4e\xd1\x02\x4d\xd3\x83\x8d\x02\xbd\x0d\x77\x47\xe4\xd4\xab\x5d\x62\x77\x24\x86\x28\x72\xeb\x93\xf4\xd1\xfa\x24\xc5\x2e\x3f\x2c\xb7\xb6\x63\x9f\x04\x91\xf3\xf1\x9b\xff\xfc\x97\x9b\x1d\x02\x41\x10\xcf\x4a\xb2\xed\xd9\x59\xc7\x56\xbb\xae\x44\xad\x3f\x1c\xc9\xca\xcf\x1c\x84\x2c\xf9\x45\x7e\xf5\xe9\xe3\xf7\xce\x4a\x7c\xe6\x50\x93\xce\x97\xb0\xa0\x18\x52\xc0\xe5\x7b\xf8\xf3\x0c\x00\x60\xb5\x82\xeb\x86\x80\xf7\xad\xa1\x3d\x59\x41\x61\x67\xc1\xed\x40\x1a\x0e\xa0\x3d\xd6\xaf\xb4\x77\x2d\x18\x57\xb3\x02\x0e\x60\xd0\xd7\x64\x7a\xa8\x30\x90\x06\x67\x41\x1a\x9a\x2a\xa1\x0d\x1d\x79\xd0\x14\x94\xe7\x8a\x34\xb0\x85\x6f\x1b\x91\x36\xbc\x5b\xad\x82\xa0\xba\x75\x47\xf2\x3b\xe3\xba\x52\xb9\xfd\x0a\x57\x9b\x8b\xcd\xe6\x7c\xbd\xd9\xac\xde\x6c\xd6\x6f\xd7\x17\xaf\xdf\x97\x63\xa9\x53\xb6\x9a\x83\xc4\xce\x91\xe8\x1d\xd0\x91\x7c\x0f\xc2\x7b\x8a\x9d\x13\x21\x90\x15\xf2\x01\x10\x2c\x75\x70\xf5\xe9\x23\xb8\xea\x0f\x52\xb2\x04\x16\xe8\xd8\x98\xa9\xda\x8e\x3d\x8d\x51\x79\x4c\x4c\x79\x39\x24\x4d\x86\x51\x50\x80\x06\x21\x4a\x80\xeb\xf8\x97\x63\xdd\x16\xd9\x2e\xa1\x22\x85\x87\x30\x4f\xdb\x11\x68\x07\xd6\x09\xdc\x5a\xd7\x41\xd7\xb0\x6a\xa6\xec\xd4\x16\xaa\x81\xd1\x60\x10\x10\x07\x9e\x14\xf1\x31\x12\xc4\xe6\x86\xf0\x38\xd7\x4a\x08\xcb\xa8\x97\xc2\x30\x64\x1d\x02\x79\xc0\xca\x79\x09\xe9\x7f\xeb\x9d\xa2\x10\x1e\x50\xc8\xd3\xce\x79\x5a\x46\xa0\xe8\x0c\xb4\x70\x53\x9b\x1e\x7e\x44\x75\xfb\xcf\x5f\x7f\xa7\x41\xc8\xd3\x8c\x84\xf6\x84\x52\x1a\x60\x3d\xd5\xca\xe3\xaa\x7f\x77\x96\xf2\xe5\x38\x4e\x65\x9c\xba\x1d\xfa\x2b\x17\x3d\x22\x04\x2d\xd6\x54\x02\xfc\xd6\x90\x05\xfc\xbf\x90\x53\x31\x0e\xd3\xc0\xc9\x26\x68\xfb\xb4\x9a\xb1\x75\xa2\x4d\x44\x07\xdb\xb0\xa6\xc1\x6f\x7b\xa7\xd1\xa4\x06\xaf\x52\x67\xf2\xe5\xdd\x9c\x1c\x86\x84\xfa\x80\x1e\xad\x50\x9c\x76\x58\x59\xc4\xb3\xf4\x59\x20\xbf\xb7\xd1\x69\xe0\x13\x8c\xa9\x5a\xea\x76\xd7\xe7\xde\xd2\x39\x4c\xf9\x04\xa1\x41\x63\x80\x6b\xeb\x3c\x3d\xa0\xbc\x8d\x3a\x91\x8d\x9e\xbc\xdb\x59\x10\xd7\xc6\x7f\xec\x07\x77\xa2\x8a\x67\xea\x6e\xe0\xc9\x06\x27\x07\x27\x9f\x0d\x91\x8f\x47\x0a\xf2\x6f\xe6\x65\x9c\xd0\xfd\x12\x8d\x46\x93\xe1\xc8\x02\x7d\x46\x25\xa6\x9f\x4f\xe0\x69\xcb\xb8\x02\x85\x56\x91\x31\xa4\x61\x81\x56\xcf\x0c\xa3\xe4\x34\x2a\x3e\x36\x98\xab\x28\xe5\xbc\x66\x5b\x9b\xbe\x28\xcf\xd2\x53\x43\x02\x13\x10\x5c\x82\x76\xea\x90\x90\x6a\x92\x0f\x43\xf2\x77\xfd\x4f\x7a\x91\x4d\x31\x59\xb1\x4d\x79\x8f\x7d\x9c\xb2\xd9\x36\xd9\x03\x5f\xa5\x91\xe3\x66\x90\x13\xe3\x11\xb8\x37\xd9\x1c\x34\xb5\x2b\x83\xf4\x86\xca\x23\x07\xae\xd8\xb0\xf4\x70\x09\x59\xb6\x7d\x2c\xce\xb5\xa8\x86\xa0\xd7\x43\xcc\x97\x62\x3b\xcc\x39\x07\x3e\x44\xec\xda\xaf\xc1\xc6\x98\xc8\xba\x63\x43\xf3\xcb\x94\x50\xb6\x3e\xfd\x5e\xd1\x0e\x0f\x46\x16\xc5\x09\xdc\x63\x62\xc6\x2a\x37\xad\x71\xa8\x7f\x60\x32\x3a\x2b\xca\xf8\x24\xc0\xe5\x58\x52\xa3\xe0\xb5\x47\x1b\x76\xe4\x87\x57\x2f\x2b\xea\xfc\x3e\x2b\xca\x70\xa8\xf6\x3c\x03\x3d\x4f\x89\xd1\xad\x5f\x93\x63\x70\x5f\x78\xf9\xea\x1a\xd6\x9a\xec\x73\x16\xb8\xfe\x0f\xf6\x93\x86\x8b\xd7\xcf\x13\xcc\xbf\x0e\x2b\x4a\x07\xa3\xf2\xae\x8b\x23\xec\xbc\xdb\x83\x6b\xc9\xb2\xad\xd3\x8b\xa8\xdf\x7c\x17\xc4\x9b\x12\x13\xdc\xc9\xc7\x6f\xac\x36\x1e\xe4\x11\x08\x60\xf1\xe4\x55\x78\xfe\xf6\xcd\xf9\xf9\xc5\x7a\xbe\x09\x8b\x67\xd9\x27\x8e\xfd\xa5\xd8\xfe\x1b\x00\x00\xff\xff\xdf\xfa\x50\xb3\x12\x08\x00\x00")
+
+func jsDragdropJsBytes() ([]byte, error) {
+	return bindataRead(
+		_jsDragdropJs,
+		"js/dragdrop.js",
+	)
+}
+
+func jsDragdropJs() (*asset, error) {
+	bytes, err := jsDragdropJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "js/dragdrop.js", size: 2066, mode: os.FileMode(420), modTime: time.Unix(1609421047, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesHtmlBaseHtmlTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x6c\x90\x31\x6f\x84\x30\x0c\x85\xf7\xfb\x15\xae\x77\xc8\xda\x21\xb0\xb4\x9d\x7b\x43\x97\x8e\x39\xf0\x29\xe8\x0c\x87\x12\x9f\x54\x14\xe5\xbf\x57\x38\x55\xc3\x70\x13\xb6\x1f\x7e\x9f\x5f\xec\xcb\xfb\xe7\xdb\xd7\xf7\xf9\x03\xbc\xcc\xdc\x9f\x6c\xf9\x00\x00\x58\x4f\x6e\x2c\xa5\xb6\x33\x89\x83\xc1\xbb\x10\x49\x3a\x7c\xc8\xb5\x79\xc5\x83\x2c\x93\x30\xf5\x29\x5d\xf8\x3e\xdc\x00\xb5\x45\x68\x73\x0e\x8f\xe8\x79\x5a\x6e\x29\xd1\x32\xe6\x6c\x4d\xf9\xb3\x6e\xee\x22\x04\xe2\x0e\xa3\x6c\x4c\xd1\x13\x09\x82\x6c\x2b\x75\x28\xf4\x23\x66\x88\x11\xc1\x07\xba\x76\xb8\xd7\x66\x76\xd3\xd2\xea\xd0\x54\x9b\x7f\xf2\x7e\x76\xe3\xd6\x95\x96\x51\xf9\xca\x85\x26\xe7\x92\xca\xd4\x58\xf6\x72\x1f\xb7\x27\x0e\xfb\x58\x57\xeb\x8d\x6b\xa0\xfe\x94\xd2\xe0\x98\xa1\x3d\x07\x3a\x6a\x46\xc5\xea\xa2\x31\xff\x60\x85\x60\x8d\x3e\xeb\x6f\x00\x00\x00\xff\xff\x1e\x3c\x4d\x87\x6d\x01\x00\x00")
+
+func templatesHtmlBaseHtmlTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesHtmlBaseHtmlTmpl,
+		"templates/html/base.html.tmpl",
+	)
+}
+
+func templatesHtmlBaseHtmlTmpl() (*asset, error) {
+	bytes, err := templatesHtmlBaseHtmlTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/html/base.html.tmpl", size: 365, mode: os.FileMode(420), modTime: time.Unix(1590859748, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesHtmlErrorHtmlTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\xaa\xae\x4e\x49\x4d\xcb\xcc\x4b\x55\x50\x2a\xc9\x2c\xc9\x49\x55\xaa\xad\xe5\x72\x2d\x2a\xca\x2f\x52\xd0\x55\x28\x2a\x2d\xce\xc8\xc9\xcc\xcb\xe6\xaa\xae\x4e\xcd\x4b\xa9\xad\x05\x04\x00\x00\xff\xff\x73\xdb\x0d\xaf\x2b\x00\x00\x00")
+
+func templatesHtmlErrorHtmlTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesHtmlErrorHtmlTmpl,
+		"templates/html/error.html.tmpl",
+	)
+}
+
+func templatesHtmlErrorHtmlTmpl() (*asset, error) {
+	bytes, err := templatesHtmlErrorHtmlTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/html/error.html.tmpl", size: 43, mode: os.FileMode(420), modTime: time.Unix(1568580372, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesHtmlIndexHtmlTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\xbc\x95\x4d\x6f\xe3\x36\x13\xc7\xef\xfc\x14\xb3\xf4\x61\x9f\x07\x88\xc5\x64\x8f\xae\x24\xf4\x0d\x01\x16\x70\x81\xc2\x5b\xa3\x40\x6f\xb4\x38\xb2\x98\x52\x1c\x81\x1c\xd9\x31\xbc\xfe\xee\x05\x29\x3b\x71\x52\x64\xd1\x00\x45\x6f\x1a\x72\xe6\x3f\xe4\x6f\x86\xa3\xe3\xd1\x60\x6b\x3d\x82\xec\x50\x9b\xb9\x1e\x06\xf4\x46\x9e\x4e\xa2\x8c\x4d\xb0\x03\x03\x1f\x06\xac\x24\xe3\x23\xab\x07\xbd\xd3\xd3\xaa\x84\x18\x9a\x4a\xaa\x87\xa8\x4c\xd0\x5b\x13\x68\x28\x1e\xa2\x04\x83\x2d\x86\xba\x54\x93\x57\x2d\x8e\x47\xf4\xe6\x74\x12\xe2\x39\xcd\x86\xcc\x21\xeb\x1b\xbb\x83\xc8\x07\x87\x95\xdc\xd9\x68\x37\xd6\x59\x3e\x2c\x3a\x6b\x0c\xfa\xef\x80\x06\xdd\x24\xfb\x56\x82\x35\x95\x4c\x19\xfe\x20\x8f\xb2\xbe\xb7\x0e\xc1\xfa\x86\x7a\xeb\xb7\x1f\x60\xf1\x73\xa9\x8c\xdd\xd5\xa2\xec\xee\xea\xd9\x6a\x0d\x83\x8e\x8c\x73\x33\xf6\x43\xa9\xba\xbb\x5a\x88\x1f\x75\x44\x03\xe4\xa1\x63\x1e\xe2\x42\xa9\xdb\xc7\xdb\x22\xb2\xba\x01\xee\x6c\x84\x68\x19\x41\x3b\x47\xfb\x08\x07\x1a\x81\x09\x50\x47\xeb\x0e\x30\x0e\x8e\xb4\x81\xd6\x3a\x8c\xa0\xbd\x81\xd8\x51\x60\xf4\xb0\x5e\x2d\x23\x8c\xd1\xfa\xad\xe0\x0e\xa1\xa1\xbe\x4f\xdb\xce\x7a\x2c\x84\x28\xbb\x4f\xf5\xef\xb8\x99\xff\xf0\xeb\xe7\x52\x75\x9f\x6a\x51\x46\x6c\xd8\x92\xaf\x05\x00\x40\xd9\x52\xe8\xf3\x9d\x92\xf0\x3a\xe7\xb8\xa7\xd0\x4b\xd0\xd9\xab\x92\x4a\x42\x8f\xdc\x91\xa9\xe4\x40\x91\x25\xa0\x6f\xa6\x2a\xf4\xa3\x63\x3b\xe8\xc0\x2a\x89\xcc\x8d\x66\x2d\x27\xd5\xac\xec\xf4\x06\x1d\x34\x4e\xc7\x58\xc9\xe4\xb1\x4c\x0b\x12\x5a\x0a\x2f\xb2\x59\x74\x46\xd6\x93\x01\x3a\x5f\x70\x51\xaa\x1c\x7d\xa5\x66\xfd\x30\xf2\xeb\x83\xe6\xd0\xeb\x14\xbf\x68\xeb\x25\x78\xdd\xe3\xe4\x27\xcf\x0d\x33\x7d\xab\x77\xeb\x7d\x19\x37\xbd\xe5\x8b\x4a\x3c\x5b\x3b\xed\x46\xac\xe4\x54\x91\x0f\x4f\xba\x65\xe6\x50\x8b\x52\x3d\x21\x7e\x0b\xf6\xb9\x76\xeb\xd5\xf2\xbf\x80\x7d\x95\xed\x15\xec\xf5\x6a\xf9\x4d\xd6\xaf\x23\xdf\x62\x7d\xf6\xbb\x80\x1a\x83\x7b\x8b\xf6\xb3\xe2\x85\xed\x3f\xc5\x7d\x8e\xfc\x26\xef\xdc\xee\x3f\x5d\xbd\x00\x78\xee\xfb\x21\x60\x2d\x66\xf0\xa2\xd1\x44\x33\x06\x07\xf3\xfb\x8f\xc9\xa8\xbe\x3f\xd0\x18\xd2\x57\x31\xf8\xed\x47\x28\x35\x74\x01\xdb\x4a\x1e\x8f\xc5\x8a\x88\xd7\xab\xe5\xe9\x24\xeb\x6b\xab\x54\xba\x16\x62\x06\x5f\xce\x6f\x31\x13\x7d\x12\x3d\x9f\xb8\x4a\x4f\x7d\xa1\x14\x3e\xea\x7e\x70\x58\x34\xd4\xab\x48\x3d\x2a\x47\x7e\xab\xc6\xe0\xde\x95\xea\xb7\x0e\xa1\xb5\x21\xf2\x74\x3f\x6a\x21\xbd\xfa\x80\x71\x74\x0c\x7b\xeb\x1c\x34\xe4\x59\x5b\x9f\xd7\xcf\x47\x40\x93\x0e\x56\x88\x99\x98\xc1\xe7\x69\x87\xb8\xc3\x90\x35\xe2\x4d\x1e\x35\x39\xb6\xb5\xde\x9c\xb7\xac\x4f\x78\x75\x02\x7b\x93\x46\x9c\x1b\x4d\x9a\x31\xb3\xeb\x8d\x3c\xc8\x68\x9f\xc6\x94\x41\x87\x8c\xaf\x92\xd2\xe6\x01\x1b\x2e\xc4\x33\x77\x1a\x39\xb5\x42\x1b\xa8\x07\xed\xa7\x4c\x43\xa0\x06\x63\x14\xad\xdd\x3a\x64\x58\x8d\xb1\x73\xd6\xff\x09\x5f\xe1\x65\x79\xe6\xef\x03\x45\x97\x99\x39\xd5\x3a\x0f\x4d\xf2\xee\x00\xf8\xc8\x41\x37\xfc\x77\x40\xf0\x3f\x5b\x60\x01\xdc\x05\xda\x83\xde\xeb\xc3\x85\x2d\xff\xff\xdf\xe8\x14\xf8\x0a\xe9\xb7\x06\x73\x0f\x77\xa2\x54\xb9\x21\x2f\xff\xa4\xbf\x02\x00\x00\xff\xff\x55\x95\x0e\x65\xfa\x06\x00\x00")
+
+func templatesHtmlIndexHtmlTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesHtmlIndexHtmlTmpl,
+		"templates/html/index.html.tmpl",
+	)
+}
+
+func templatesHtmlIndexHtmlTmpl() (*asset, error) {
+	bytes, err := templatesHtmlIndexHtmlTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/html/index.html.tmpl", size: 1786, mode: os.FileMode(420), modTime: time.Unix(1609421047, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesHtmlPastemetaHtmlTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x94\x94\xc1\x6e\xdb\x38\x10\x86\xef\x7a\x8a\x01\x0f\x89\x73\x90\x75\x4f\x24\x2d\x76\x9d\x5d\x60\xd1\x1c\x8a\xd4\xe9\xa1\x37\x5a\x1c\xc7\x8c\x69\x92\x25\x47\x49\x0c\x82\xef\x5e\x50\xb4\x65\xa7\x71\x5b\xe7\x22\x40\xc3\xe1\xf7\xcf\x3f\x98\x61\x08\x02\x97\x52\x23\x30\x92\xa4\x90\xc5\x58\x5c\x86\x30\xfd\xcc\x3d\xe1\xf4\x13\x6e\x63\x0c\x61\xfa\x9f\x54\xf8\xef\x2b\xc5\x78\x09\x1b\x24\x2e\x38\x71\x28\xc1\xf5\x7e\xa5\xa4\x5e\x17\x21\xa0\x16\x31\x16\xc5\x01\xb6\x42\x2e\x4a\x6e\x2d\x6a\x91\x90\xb5\xef\x9c\xb4\x04\xb4\xb5\xd8\x30\xc2\x57\xaa\x9e\xf8\x33\xcf\x51\x06\xde\x75\x0d\xab\x9e\x7c\xd5\x19\xbb\xed\x94\xb4\x0b\xc3\x9d\x98\x3e\x79\x06\x02\x97\xe8\xda\xba\xca\xa9\xed\x29\xad\x85\x11\xdb\x41\xc4\x3a\x04\x29\x1a\x96\x28\x73\x33\xdb\x73\x66\x46\x13\x97\x1a\x1d\x83\x4e\x71\xef\x1b\xb6\x92\x42\xa0\x66\x6d\x51\x2f\x7a\x22\xa3\xc1\xe8\x4e\xc9\x6e\xfd\xee\xea\x24\xf5\xe2\xde\x18\x7a\xb8\xbf\x8b\xb1\xfa\x4d\x63\xae\x58\x3b\x33\x76\x0b\x0f\xf7\x77\x40\x06\x46\x13\x75\x95\x25\x5a\xa8\xbd\xe5\xfa\x54\x7d\x5f\x88\x53\xef\x59\x32\x69\xb9\x6e\x8b\xba\xb2\x0e\xdb\xc1\x4e\x5b\xd4\x1c\x56\x0e\x97\x0d\x3b\xb3\x10\xd6\x9e\x99\x58\x57\xbc\x2d\xca\xb2\x2c\x42\x90\x4b\xe0\x5a\xc0\x44\x23\xec\xb2\x53\x49\xe9\xeb\xa4\x7e\x04\x26\x50\x21\xa1\x60\x57\x30\x9d\x71\x7d\x3b\xfc\xfd\x63\x8c\x8a\xb1\x78\x91\xb4\x82\x7c\x0e\x64\xd6\xa8\xaf\xe1\xa3\x15\xff\x95\xaf\xcf\xd3\xed\x66\x4c\xbb\x3d\x04\x3f\x60\xea\x0c\xd6\xe0\x3b\x04\x54\x1e\xa1\x3c\xed\xe0\x42\xd1\x4d\xaf\xd7\xda\xbc\xe8\x8b\x47\xba\xc9\x33\x37\x24\xa7\xf9\xbd\x86\x11\x3c\xdf\x5a\x8c\xb1\xf0\xa9\x5b\x47\xe1\xa1\x7b\x31\xe6\xce\xee\x62\x33\x87\x9c\x50\xfc\x4d\xd3\xff\xfd\x37\x74\x66\xc0\x75\x39\x78\x0d\x3b\xb5\xe3\xba\xc6\xb3\x11\x3b\x22\x06\xf4\xbe\xa4\x63\x91\x07\x2b\xde\x8b\x28\xee\x09\xfa\x7c\x72\x52\xe9\x6d\xc2\x28\x37\xc2\x7e\x29\x97\xfb\x9a\xe4\xbe\x72\x25\xf3\xf9\x6e\x56\x80\xd3\x11\xea\x90\x38\x97\x1b\x7c\xc3\x7b\xdb\xf9\x10\x0e\x13\x96\xa7\x2f\xed\xf5\xd2\xb8\x0d\xf0\x8e\xa4\xd1\xcd\x6e\x18\xcf\x19\x9a\xf4\x56\xad\x8c\x68\x98\x35\x9e\xd2\xb2\x4b\x6d\xfb\xfd\x1b\xe4\xfb\xc5\x46\x12\x03\xcd\x37\xb8\x87\x32\x78\xe6\xaa\xc7\x86\x65\x0e\xd8\x04\x65\x45\x08\x25\xc8\x25\x18\x07\x13\xfc\xfe\xa7\x0d\x99\x68\x43\x3f\xad\xc9\x55\x36\x2a\x3d\x5f\x28\x14\x03\x6e\xef\x3e\x2d\x7b\x72\x37\x2e\xfd\xfe\x79\xfb\x11\x00\x00\xff\xff\x3a\xc6\xf5\xbb\x97\x05\x00\x00")
+
+func templatesHtmlPastemetaHtmlTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesHtmlPastemetaHtmlTmpl,
+		"templates/html/pasteMeta.html.tmpl",
+	)
+}
+
+func templatesHtmlPastemetaHtmlTmpl() (*asset, error) {
+	bytes, err := templatesHtmlPastemetaHtmlTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/html/pasteMeta.html.tmpl", size: 1431, mode: os.FileMode(420), modTime: time.Unix(1620245565, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesTxtBaseTxtTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x01\x00\x00\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00")
+
+func templatesTxtBaseTxtTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesTxtBaseTxtTmpl,
+		"templates/txt/base.txt.tmpl",
+	)
+}
+
+func templatesTxtBaseTxtTmpl() (*asset, error) {
+	bytes, err := templatesTxtBaseTxtTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/txt/base.txt.tmpl", size: 0, mode: os.FileMode(420), modTime: time.Unix(1568569370, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesTxtErrorTxtTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\xaa\xae\xd6\xf3\x4d\x2d\x2e\x4e\x4c\x4f\xad\xad\x05\x04\x00\x00\xff\xff\xa1\x68\xe0\xbd\x0c\x00\x00\x00")
+
+func templatesTxtErrorTxtTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesTxtErrorTxtTmpl,
+		"templates/txt/error.txt.tmpl",
+	)
+}
+
+func templatesTxtErrorTxtTmpl() (*asset, error) {
+	bytes, err := templatesTxtErrorTxtTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/txt/error.txt.tmpl", size: 12, mode: os.FileMode(420), modTime: time.Unix(1568575116, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesTxtIndexTxtTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x8c\x91\xcf\x6a\xdc\x30\x10\xc6\xef\x7a\x8a\x0f\x7c\x48\x0b\xbb\x76\x7a\x0d\x2c\xb4\x85\xed\x1f\x08\x2d\x78\xe3\x07\x50\xed\xf1\x5a\xed\x58\x63\xa4\x11\x5e\x93\xe4\xdd\x8b\x9c\x6d\xd9\x26\x3d\x44\x27\x49\xc3\xcc\xef\xe3\x37\x45\xdd\xa0\xa9\x6f\x71\xf8\xf2\xbd\xbe\xdb\x7f\xdb\xd7\x66\xf7\xfc\x18\xf3\xd1\x46\xea\x20\x1e\x83\xea\x14\x6f\xaa\xea\xfa\x74\x5d\x46\xad\x36\xd0\xc1\x45\x44\xa7\x04\xcb\x2c\x73\xc4\x22\x09\x2a\x20\x1b\x1d\x2f\x88\x83\x04\x25\x9f\x09\x11\x29\x3a\x7f\x34\x3a\x10\x5a\x19\x47\xeb\x3b\xb0\xf3\x54\x1a\x53\x14\x68\x0e\x1f\x3e\xef\x8d\x29\xd0\x4c\x2c\xb6\x83\x45\xef\x98\x4c\x9b\x02\x63\xfb\xe9\x2a\x3f\x76\xef\x17\x49\x21\xdf\xca\xc9\x1f\xaf\x70\x7f\x5f\xd6\x22\xda\xd4\xb7\x8f\x8f\xb9\xf3\x70\x66\xd9\x4c\xfb\xdb\x79\x4e\xb0\xcb\xc9\x6f\xaa\x8a\x4e\x76\x9c\x98\xca\x56\xc6\x2a\xca\x48\x15\x8b\x3f\x56\x29\xf0\xcb\x79\x77\x03\xa1\x77\x21\xea\x1a\x13\xd2\x23\x47\x0f\x14\x13\x2b\x66\xc7\x8c\x56\xbc\x5a\xe7\xd7\xff\x33\x87\xba\x4c\x2f\x4d\x61\x0a\x7c\x7d\xaa\x88\x0e\x14\xd6\x19\x71\xb3\xea\x59\x7b\x7b\xe7\xbb\x73\xc9\xf9\x5e\xc2\x68\xd5\x89\xdf\xc0\xf9\x96\x53\x97\x45\x15\x97\x85\x55\xbe\xcc\x59\x6d\x47\x4c\x4a\xcf\xa0\xf2\xe3\x27\xb5\x5a\x5e\x18\x94\xa4\x53\x52\xf4\x41\x46\x58\xff\x44\x9a\x82\xb4\x14\xa3\xe9\xdd\x91\x49\x51\xa7\x38\xb0\xf3\xbf\xf0\x80\x7f\x45\x6f\xff\x63\x43\x90\x2e\x57\x83\xbc\x3f\xf1\xbc\x80\x4e\x1a\x6c\xab\x2f\x2d\xe0\x8d\x2b\xa9\x84\x0e\x41\x66\xd8\xd9\x2e\x7f\x04\xea\xdb\x57\x2f\x16\x0f\x18\xc8\x76\xd8\x7a\xbc\x33\xbf\x03\x00\x00\xff\xff\x54\x6e\xbb\xfa\xac\x02\x00\x00")
+
+func templatesTxtIndexTxtTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesTxtIndexTxtTmpl,
+		"templates/txt/index.txt.tmpl",
+	)
+}
+
+func templatesTxtIndexTxtTmpl() (*asset, error) {
+	bytes, err := templatesTxtIndexTxtTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/txt/index.txt.tmpl", size: 684, mode: os.FileMode(420), modTime: time.Unix(1590859748, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+var _templatesTxtPastemetaTxtTmpl = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\xac\x51\x4f\x4b\x3b\x31\x10\xbd\xe7\x53\x0c\xf9\x5d\x7e\x82\x89\xf7\xe2\x1f\xb4\x5d\x41\xec\x41\xea\x7a\xf1\xd4\x65\x77\x6a\x43\x97\xa4\x6e\x66\x69\x97\x30\xdf\x5d\x36\xa9\xb1\xa8\x07\x41\x2f\x81\xcc\xbc\x79\xef\xcd\x9b\x10\xf4\xc2\x39\x7a\x5a\xcc\x99\xcf\x42\xd0\x0f\x95\x27\xd4\xf7\x38\x30\x87\xa0\x6f\x4d\x8b\xc5\x9e\x98\x85\x52\x4a\x84\x60\x56\x50\xd9\x06\xfe\x5b\x84\x03\xf2\x91\xaa\xf8\x76\xc6\xbe\x80\x6c\xb0\x45\xc2\x46\x9e\x80\x9e\x56\x76\x16\x7f\x37\xce\xb5\xcc\x62\x67\x68\x0d\xa9\x0f\xe4\x36\x68\x27\xf0\x43\xed\xab\x34\x55\x8e\x43\x17\x19\x36\xfb\x28\x32\x8b\x10\xb0\xf5\x08\xea\x7b\xa1\xf3\xde\x6e\xac\xdb\xd9\xcb\x11\x67\x9b\x11\x46\xc3\x16\xa3\x83\xc4\x56\x0e\x5b\x64\x16\x7e\xdc\xe6\xa8\x1c\xb7\x8b\xf4\x66\xf5\xbe\xf1\xb4\xc3\x8a\xb0\xb9\x26\x7d\xe7\x9f\xb1\x73\x51\xb4\x4e\xc5\x09\x1c\x94\x8e\x0d\xe5\x5e\xa6\xcd\x14\xc9\x79\x72\x24\xbe\x84\x93\x23\x4c\xf1\x32\x8b\xdf\x9d\x60\xb9\x5c\x8a\x7f\x50\xba\x9c\xce\xda\xf8\xcf\x11\x9c\x02\xee\xb1\xee\x09\x27\xa2\xee\xbb\x16\x94\xea\xf0\xb5\x47\x4f\x20\x67\xc5\xbc\x28\x0b\x09\xf2\xef\xee\x26\xa3\xa7\x18\x01\xb3\x78\x0b\x00\x00\xff\xff\x81\xcd\x43\x9e\x8c\x02\x00\x00")
+
+func templatesTxtPastemetaTxtTmplBytes() ([]byte, error) {
+	return bindataRead(
+		_templatesTxtPastemetaTxtTmpl,
+		"templates/txt/pasteMeta.txt.tmpl",
+	)
+}
+
+func templatesTxtPastemetaTxtTmpl() (*asset, error) {
+	bytes, err := templatesTxtPastemetaTxtTmplBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "templates/txt/pasteMeta.txt.tmpl", size: 652, mode: os.FileMode(420), modTime: time.Unix(1620245565, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+// Asset loads and returns the asset for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func Asset(name string) ([]byte, error) {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[cannonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("Asset %s can't read by error: %v", name, err)
+		}
+		return a.bytes, nil
+	}
+	return nil, fmt.Errorf("Asset %s not found", name)
+}
+
+// MustAsset is like Asset but panics when Asset would return an error.
+// It simplifies safe initialization of global variables.
+func MustAsset(name string) []byte {
+	a, err := Asset(name)
+	if err != nil {
+		panic("asset: Asset(" + name + "): " + err.Error())
+	}
+
+	return a
+}
+
+// AssetInfo loads and returns the asset info for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func AssetInfo(name string) (os.FileInfo, error) {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[cannonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("AssetInfo %s can't read by error: %v", name, err)
+		}
+		return a.info, nil
+	}
+	return nil, fmt.Errorf("AssetInfo %s not found", name)
+}
+
+// AssetNames returns the names of the assets.
+func AssetNames() []string {
+	names := make([]string, 0, len(_bindata))
+	for name := range _bindata {
+		names = append(names, name)
+	}
+	return names
+}
+
+// _bindata is a table, holding each asset generator, mapped to its name.
+var _bindata = map[string]func() (*asset, error){
+	"css/main.css":                       cssMainCss,
+	"js/copyclipboard.js":                jsCopyclipboardJs,
+	"js/dragdrop.js":                     jsDragdropJs,
+	"templates/html/base.html.tmpl":      templatesHtmlBaseHtmlTmpl,
+	"templates/html/error.html.tmpl":     templatesHtmlErrorHtmlTmpl,
+	"templates/html/index.html.tmpl":     templatesHtmlIndexHtmlTmpl,
+	"templates/html/pasteMeta.html.tmpl": templatesHtmlPastemetaHtmlTmpl,
+	"templates/txt/base.txt.tmpl":        templatesTxtBaseTxtTmpl,
+	"templates/txt/error.txt.tmpl":       templatesTxtErrorTxtTmpl,
+	"templates/txt/index.txt.tmpl":       templatesTxtIndexTxtTmpl,
+	"templates/txt/pasteMeta.txt.tmpl":   templatesTxtPastemetaTxtTmpl,
+}
+
+// AssetDir returns the file names below a certain
+// directory embedded in the file by go-bindata.
+// For example if you run go-bindata on data/... and data contains the
+// following hierarchy:
+//     data/
+//       foo.txt
+//       img/
+//         a.png
+//         b.png
+// then AssetDir("data") would return []string{"foo.txt", "img"}
+// AssetDir("data/img") would return []string{"a.png", "b.png"}
+// AssetDir("foo.txt") and AssetDir("notexist") would return an error
+// AssetDir("") will return []string{"data"}.
+func AssetDir(name string) ([]string, error) {
+	node := _bintree
+	if len(name) != 0 {
+		cannonicalName := strings.Replace(name, "\\", "/", -1)
+		pathList := strings.Split(cannonicalName, "/")
+		for _, p := range pathList {
+			node = node.Children[p]
+			if node == nil {
+				return nil, fmt.Errorf("Asset %s not found", name)
+			}
+		}
+	}
+	if node.Func != nil {
+		return nil, fmt.Errorf("Asset %s not found", name)
+	}
+	rv := make([]string, 0, len(node.Children))
+	for childName := range node.Children {
+		rv = append(rv, childName)
+	}
+	return rv, nil
+}
+
+type bintree struct {
+	Func     func() (*asset, error)
+	Children map[string]*bintree
+}
+
+var _bintree = &bintree{nil, map[string]*bintree{
+	"css": &bintree{nil, map[string]*bintree{
+		"main.css": &bintree{cssMainCss, map[string]*bintree{}},
+	}},
+	"js": &bintree{nil, map[string]*bintree{
+		"copyclipboard.js": &bintree{jsCopyclipboardJs, map[string]*bintree{}},
+		"dragdrop.js":      &bintree{jsDragdropJs, map[string]*bintree{}},
+	}},
+	"templates": &bintree{nil, map[string]*bintree{
+		"html": &bintree{nil, map[string]*bintree{
+			"base.html.tmpl":      &bintree{templatesHtmlBaseHtmlTmpl, map[string]*bintree{}},
+			"error.html.tmpl":     &bintree{templatesHtmlErrorHtmlTmpl, map[string]*bintree{}},
+			"index.html.tmpl":     &bintree{templatesHtmlIndexHtmlTmpl, map[string]*bintree{}},
+			"pasteMeta.html.tmpl": &bintree{templatesHtmlPastemetaHtmlTmpl, map[string]*bintree{}},
+		}},
+		"txt": &bintree{nil, map[string]*bintree{
+			"base.txt.tmpl":      &bintree{templatesTxtBaseTxtTmpl, map[string]*bintree{}},
+			"error.txt.tmpl":     &bintree{templatesTxtErrorTxtTmpl, map[string]*bintree{}},
+			"index.txt.tmpl":     &bintree{templatesTxtIndexTxtTmpl, map[string]*bintree{}},
+			"pasteMeta.txt.tmpl": &bintree{templatesTxtPastemetaTxtTmpl, map[string]*bintree{}},
+		}},
+	}},
+}}
+
+// RestoreAsset restores an asset under the given directory
+func RestoreAsset(dir, name string) error {
+	data, err := Asset(name)
+	if err != nil {
+		return err
+	}
+	info, err := AssetInfo(name)
+	if err != nil {
+		return err
+	}
+	err = os.MkdirAll(_filePath(dir, filepath.Dir(name)), os.FileMode(0755))
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(_filePath(dir, name), data, info.Mode())
+	if err != nil {
+		return err
+	}
+	err = os.Chtimes(_filePath(dir, name), info.ModTime(), info.ModTime())
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// RestoreAssets restores an asset under the given directory recursively
+func RestoreAssets(dir, name string) error {
+	children, err := AssetDir(name)
+	// File
+	if err != nil {
+		return RestoreAsset(dir, name)
+	}
+	// Dir
+	for _, child := range children {
+		err = RestoreAssets(dir, filepath.Join(name, child))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func _filePath(dir, name string) string {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	return filepath.Join(append([]string{dir}, strings.Split(cannonicalName, "/")...)...)
+}

cmd/rushlink/main.go

@@ -4,19 +4,34 @@ import (
 	"flag"
 	"log"
 
-	"gitea.hashru.nl/dsprenkels/rushlink/db"
-	"gitea.hashru.nl/dsprenkels/rushlink/handlers"
-	"gitea.hashru.nl/dsprenkels/rushlink/metrics"
+	"gitea.hashru.nl/dsprenkels/rushlink"
+	"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
+	"github.com/pkg/errors"
+)
+
+var (
+	httpListen    = flag.String("listen", "127.0.0.1:8000", "listen address (host:port)")
+	metricsListen = flag.String("metrics_listen", "127.0.0.1:58614", "listen address for metrics (host:port)")
+	rootURL       = flag.String("root_url", "", "host root (example: 'https://example.com', uses an educated guess if omitted)")
 )
 
 func main() {
 	flag.Parse()
 
-	if err := db.Open(); err != nil {
+	filestore, err := db.OpenFileStoreFromEnvironment()
+	if err != nil {
+		log.Fatalln(err)
+	}
+	database, err := db.OpenDBFromEnvironment()
+	if err != nil {
 		log.Fatalln(err)
 	}
-	defer db.Close()
 
-	go metrics.StartMetricsServer()
-	handlers.StartMainServer()
+	migrate := db.Gormigrate(database)
+	if err := migrate.Migrate(); err != nil {
+		log.Fatal(errors.Wrap(err, "migrating database"))
+	}
+
+	go rushlink.StartMetricsServer(*metricsListen, database, filestore)
+	rushlink.StartMainServer(*httpListen, database, filestore, *rootURL)
 }

contrib/rushlink

@@ -0,0 +1,122 @@
+#!/usr/bin/env sh
+
+set -e
+
+LINK=https://hashru.link/
+DELFILE="${XDG_DATA_HOME:-$HOME/.local/share}/rushlink/delete"
+
+link() {
+    case "$1" in
+        https://*|http://*)
+            printf '%s' "$1" | curl -sS -F'shorten=<-' "$LINK"
+            ;;
+        *)
+            curl -sS -Ffile=@- "$LINK" < "$1"
+            ;;
+    esac | awk 'NR == 1 { print } $NF ~ /deleteToken=/ { print $NF; exit }' | (
+        IFS= read -r link
+        IFS= read -r deletelink
+        echo "$link"
+        mkdir -p "$(dirname "$DELFILE")"
+        echo "$deletelink" >> "$DELFILE"
+    )
+}
+
+del() {
+    case "$1" in
+        https://*|http://*)
+            URL="$1"
+            ;;
+        *)
+            URL="$LINK$1"
+            ;;
+    esac
+    # Remove file extension, if any.
+    NAME="${URL##*/}"
+    URL="${URL%/*}/${NAME%%.*}"
+    if DELURL=$(grep -s -m1 "$URL?deleteToken=" "$DELFILE"); then
+        echo "Deleting $URL..." >&2
+        curl -sS -X DELETE "$DELURL" | grep deleted
+    else
+        echo "Delete token for $URL is not known." >&2
+        exit 1
+    fi
+}
+
+screenshot() {
+    if command -v import >/dev/null 2>&1; then
+        CMD="import png:-"
+    elif command -v maim >/dev/null 2>&1; then
+        CMD="maim -uks"
+    else
+        echo "Neither import (imagemagick) nor maim were found. One of these is needed to make screenshots." >&2
+        exit 1
+    fi
+    FILE=$(mktemp)
+    if $CMD > "$FILE"; then
+        LINK=$(link "$FILE")
+        rm -f "$FILE"
+        echo "$LINK.png"
+        if command -v xdg-open >/dev/null 2>&1; then
+            xdg-open "$LINK.png"
+        fi
+    else
+        rm -f "$FILE"
+        exit $?
+    fi
+}
+
+if [ $# -gt 0 ]; then
+    case "$1" in
+        --help|-h)
+            CMD=$(basename "$0")
+            echo "$CMD - Command line tool for $LINK"
+            echo
+            echo "Usage:"
+            echo "    $CMD https://example.com/"
+            echo "        Shorten link."
+            echo "    $CMD file.txt"
+            echo "    $CMD < file.txt"
+            echo "        Upload file."
+            echo "    $CMD"
+            echo "    echo hi | $CMD"
+            echo "        Upload file from standard input."
+            echo "    $CMD (--screenshot|-s)"
+            echo "        Select a window or an area of your screen, and upload it as png."
+            echo "    $CMD (--delete|-d) ${LINK}xd42"
+            echo "    $CMD (--delete|-d) xd42"
+            echo "        Delete file or shortened link."
+            echo
+            echo "Delete tokens are stored in $DELFILE"
+            exit 0
+            ;;
+        --delete|-d)
+            shift
+            for url in "$@"; do
+                del "$url"
+            done
+            exit 0
+            ;;
+        --screenshot|-s)
+            shift
+            if [ $# -gt 0 ]; then
+                echo "No arguments expected to --screenshot" >&2
+                exit 1
+            fi
+            screenshot
+            exit 0
+            ;;
+        *)
+            for url in "$@"; do
+                link "$url"
+            done
+            exit 0
+    esac
+fi
+
+if [ -t 0 ]; then
+    echo "Sending standard input to $LINK" >&2
+    echo "^C to cancel, ^D to send." >&2
+fi
+
+link /dev/stdin

db/db.go

@@ -1,134 +0,0 @@
-package db
-
-import (
-	"flag"
-	"fmt"
-	"log"
-	"time"
-
-	"github.com/pkg/errors"
-	bolt "go.etcd.io/bbolt"
-
-	"gitea.hashru.nl/dsprenkels/rushlink/gobmarsh"
-)
-
-var path = flag.String("database", "", "Location of the database file")
-var DB *bolt.DB
-
-// The current database version
-//
-// If we alter the database format, we bump this number and write a new
-// database migration in migrateDatabase().
-const CURRENT_MIGRATE_VERSION = 1
-
-// Bucket storing everything that is not a bulk value. This includes stuff like
-// the database version, secret site-wide keys.
-const BUCKET_CONF = "conf"
-
-// The main bucket for paste values and URL redirects
-const BUCKET_PASTES = "pastes"
-
-// This value stores the current migration version. If this value is less than
-// CURRENT_MIGRATE_VERSION, the database has to be migrated.
-const KEY_MIGRATE_VERSION = "migrate_version"
-
-// Open the bolt database
-func Open() error {
-	if *path == "" {
-		return errors.New("database not set")
-	}
-
-	var err error
-	DB, err = bolt.Open(*path, 0666, &bolt.Options{Timeout: 1 * time.Second})
-	if err != nil {
-		return errors.Wrapf(err, "failed to open database at '%v'", *path)
-	}
-	return DB.Update(migrateDatabase)
-}
-
-// Close the bolt database
-func Close() error {
-	if DB == nil {
-		panic("no open database")
-	}
-	return DB.Close()
-}
-
-// Get the database path (as was set by flags)
-func Path() string {
-	if path == nil {
-		return ""
-	}
-	return *path
-}
-
-// Initialize and migrate the database to the current version
-func migrateDatabase(tx *bolt.Tx) error {
-	dbVersion, err := dbVersion(tx)
-	if err != nil {
-		return err
-	}
-
-	// Migrate the database to version 1
-	if dbVersion < 1 {
-		log.Println("migrating database to version 1")
-
-		// Create conf bucket
-		_, err := tx.CreateBucket([]byte(BUCKET_CONF))
-		if err != nil {
-			return err
-		}
-
-		// Create paste bucket
-		_, err = tx.CreateBucket([]byte(BUCKET_PASTES))
-		if err != nil {
-			return err
-		}
-
-		// Update the version number
-		if err := setDBVersion(tx, 1); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-// Get the current migrate version from the database
-func dbVersion(tx *bolt.Tx) (int, error) {
-	conf := tx.Bucket([]byte(BUCKET_CONF))
-	if conf == nil {
-		return 0, nil
-	}
-	dbVersionBytes := conf.Get([]byte(KEY_MIGRATE_VERSION))
-	if dbVersionBytes == nil {
-		return 0, nil
-	}
-
-	// Version was already stored
-	var dbVersion int
-	if err := gobmarsh.Unmarshal(dbVersionBytes, &dbVersion); err != nil {
-		return 0, err
-	}
-	if dbVersion == 0 {
-		return 0, fmt.Errorf("database version is invalid (%v)", dbVersion)
-	}
-	if dbVersion > CURRENT_MIGRATE_VERSION {
-		return 0, fmt.Errorf("database version is too recent (%v > %v)", dbVersion, CURRENT_MIGRATE_VERSION)
-	}
-	return dbVersion, nil
-}
-
-// Update the current migrate version in the database
-func setDBVersion(tx *bolt.Tx, version int) error {
-	conf, err := tx.CreateBucketIfNotExists([]byte(BUCKET_CONF))
-	if err != nil {
-		return err
-	}
-
-	versionBytes, err := gobmarsh.Marshal(version)
-	if err != nil {
-		return err
-	}
-	return conf.Put([]byte(KEY_MIGRATE_VERSION), versionBytes)
-}

fileupload.go

@@ -0,0 +1,30 @@
+package rushlink
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/pkg/errors"
+)
+
+// FileUploadFileSystem is a HTTP filesystem handler
+type FileUploadFileSystem struct {
+	fs http.FileSystem
+}
+
+// Open opens a file
+func (fs FileUploadFileSystem) Open(path string) (http.File, error) {
+	log.Println(path)
+	file, err := fs.fs.Open(path)
+	if err != nil {
+		return nil, errors.Wrap(err, "opening file")
+	}
+	stat, err := file.Stat()
+	if err != nil {
+		return nil, errors.Wrap(err, "file.Stat()")
+	}
+	if stat.IsDir() {
+		return nil, errors.New("directory index not allowed")
+	}
+	return file, nil
+}

go.mod

@@ -3,10 +3,58 @@ module gitea.hashru.nl/dsprenkels/rushlink
 go 1.12
 
 require (
-	github.com/go-bindata/go-bindata v3.1.2+incompatible // indirect
-	github.com/gorilla/handlers v1.4.2
-	github.com/gorilla/mux v1.7.3
-	github.com/pkg/errors v0.8.1
-	github.com/prometheus/client_golang v1.1.0
-	go.etcd.io/bbolt v1.3.3
+	github.com/Masterminds/semver/v3 v3.1.1 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cockroachdb/apd v1.1.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/denisenkom/go-mssqldb v0.11.0 // indirect
+	github.com/go-gormigrate/gormigrate/v2 v2.0.0
+	github.com/go-kit/kit v0.10.0 // indirect
+	github.com/go-sql-driver/mysql v1.6.0 // indirect
+	github.com/gofrs/uuid v4.0.0+incompatible // indirect
+	github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/go-cmp v0.5.6 // indirect
+	github.com/google/uuid v1.3.0
+	github.com/gorilla/mux v1.8.0
+	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
+	github.com/jackc/pgconn v1.10.0 // indirect
+	github.com/jackc/pgio v1.0.0 // indirect
+	github.com/jackc/pgmock v0.0.0-20210724152146-4ad1a8207f65 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgproto3/v2 v2.1.1 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b // indirect
+	github.com/jackc/pgtype v1.8.1 // indirect
+	github.com/jackc/pgx/v4 v4.13.0 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.2 // indirect
+	github.com/joho/godotenv v1.4.0 // indirect
+	github.com/kr/pretty v0.3.0 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/lib/pq v1.10.3 // indirect
+	github.com/mattn/go-sqlite3 v1.14.8 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/pkg/errors v0.9.1
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_golang v1.11.0
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.31.1 // indirect
+	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/rogpeppe/go-internal v1.8.0 // indirect
+	github.com/shopspring/decimal v1.2.0 // indirect
+	github.com/stretchr/testify v1.7.0 // indirect
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
+	golang.org/x/sys v0.0.0-20211002104244-808efd93c36d // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	gorm.io/driver/mysql v1.1.2 // indirect
+	gorm.io/driver/postgres v1.1.2
+	gorm.io/driver/sqlite v1.1.5
+	gorm.io/driver/sqlserver v1.0.9 // indirect
+	gorm.io/gorm v1.21.15
 )

go.sum

@@ -1,76 +1,916 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
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handlers.go

@@ -0,0 +1,418 @@
+package rushlink
+
+import (
+	"crypto/subtle"
+	"fmt"
+	"log"
+	"mime/multipart"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+
+	"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
+	"github.com/google/uuid"
+	"github.com/gorilla/mux"
+	"github.com/pkg/errors"
+)
+
+const (
+	// formParseMaxMemory value is based on the default value that is used in
+	// Request.ParseMultipartForm.
+	formParseMaxMemory = 32 << 20 // 32 MB
+
+	// highOnlineEntropy is the desired entropy of an "unguessable" paste URL
+	// (in bits). It should be chosen such that it should be hard for an
+	// attacker to find *any* key that should not be found.
+	// It is desired that the probability to guess a good key is small.
+	//
+	//                         [ amount of pastes ]
+	//     Pr[ good key ] = ---------------------------
+	//                      [ amount of possible keys ]
+	//
+	// So with a conservative [ amount of pastes ] = 2^32 (= 4 billion), and
+	// an [ amount of possible keys ] = 2^80 then the probability of a correct
+	// guess is 2^-48.
+	highOnlineEntropy = 80
+)
+
+type viewPaste uint
+
+const (
+	_ viewPaste = 1 << iota
+	viewNoRedirect
+	viewShowMeta
+)
+
+type canDelete uint
+
+const (
+	canDeleteUndef canDelete = iota
+	canDeleteYes
+	canDeleteNo
+)
+
+func (cd *canDelete) Bool() bool {
+	return *cd == canDeleteYes
+}
+
+func (cd *canDelete) String() string {
+	switch *cd {
+	case canDeleteUndef:
+		return "undefined"
+	case canDeleteYes:
+		return "correct"
+	case canDeleteNo:
+		return "invalid"
+	default:
+		panic("unreachable")
+	}
+}
+
+func (rl *rushlink) staticGetHandler(w http.ResponseWriter, r *http.Request) {
+	rl.renderStatic(w, r, mux.Vars(r)["path"])
+}
+
+func (rl *rushlink) indexGetHandler(w http.ResponseWriter, r *http.Request) {
+	rl.render(w, r, http.StatusOK, "index", map[string]interface{}{})
+}
+
+func (rl *rushlink) viewPasteHandler(w http.ResponseWriter, r *http.Request) {
+	rl.viewPasteHandlerFlags(w, r, 0)
+}
+
+func (rl *rushlink) viewPasteHandlerNoRedirect(w http.ResponseWriter, r *http.Request) {
+	rl.viewPasteHandlerFlags(w, r, viewNoRedirect)
+}
+
+func (rl *rushlink) viewPasteHandlerMeta(w http.ResponseWriter, r *http.Request) {
+	rl.viewPasteHandlerFlags(w, r, viewShowMeta)
+}
+
+func (rl *rushlink) viewPasteHandlerFlags(w http.ResponseWriter, r *http.Request, flags viewPaste) {
+	vars := mux.Vars(r)
+	key := vars["key"]
+	var p *db.Paste
+	var fu *db.FileUpload
+	var notFound bool
+	err := rl.db.Transaction(func(tx *db.Database) error {
+		var err error
+		p, err = db.GetPaste(tx, key)
+		if err != nil {
+			return err
+		}
+		if p != nil && p.Type == db.PasteTypeFileUpload {
+			var id uuid.UUID
+			copy(id[:], p.Content)
+			fu, err = db.GetFileUpload(tx, id)
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	if notFound {
+		err = db.ErrPasteDoesNotExist
+	}
+	if err != nil {
+		status := db.ErrHTTPStatusCode(err)
+		if status == http.StatusInternalServerError {
+			panic(err)
+		}
+		rl.renderError(w, r, status, err.Error())
+		return
+	}
+	rl.viewPasteHandlerInner(w, r, flags, p, fu)
+}
+
+func (rl *rushlink) viewPasteHandlerInner(w http.ResponseWriter, r *http.Request, flags viewPaste, p *db.Paste, fu *db.FileUpload) {
+	if flags&viewShowMeta != 0 {
+		rl.viewPasteHandlerInnerMeta(w, r, p, fu)
+		return
+	}
+
+	switch p.State {
+	case db.PasteStatePresent:
+		switch p.Type {
+		case db.PasteTypeFileUpload:
+			if fu == nil {
+				panic(fmt.Sprintf("file for id %v does not exist in database\n", string(p.Content)))
+			}
+			rl.viewFileUploadHandler(w, r, fu)
+			return
+		case db.PasteTypeRedirect:
+			if flags&viewNoRedirect != 0 {
+				w.Write([]byte(p.RedirectURL().String()))
+				return
+			}
+			http.Redirect(w, r, p.RedirectURL().String(), http.StatusTemporaryRedirect)
+			return
+		default:
+			panic("paste type unsupported")
+		}
+
+	case db.PasteStateDeleted:
+		rl.renderError(w, r, http.StatusGone, "paste has been deleted\n")
+		return
+	default:
+		panic(errors.Errorf("invalid paste.State (%v) for key '%v'", p.State, p.Key))
+	}
+}
+
+func (rl *rushlink) viewFileUploadHandler(w http.ResponseWriter, r *http.Request, fu *db.FileUpload) {
+	filePath := fu.Path(rl.fs)
+	file, err := os.Open(filePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			log.Printf("error: '%v' should exist according to the database, but it doesn't", filePath)
+			rl.renderError(w, r, http.StatusNotFound, "file not found")
+			return
+		}
+		// unexpected error
+		panic(err)
+	}
+
+	var modtime time.Time
+	info, err := file.Stat()
+	if err != nil {
+		log.Printf("error: %v", errors.Wrapf(err, "could not stat file '%v'", filePath))
+	} else {
+		modtime = info.ModTime()
+	}
+
+	// Provide the real filename to the client (to be used in Ctrl+S etc.)
+	quotedName := strings.ReplaceAll(fu.FileName, "\"", "\\\"")
+	w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=\"%s\"", quotedName))
+
+	// We use http.ServeContent (instead of http.ServeFile) because we cannot
+	// use http.ServeFile together with the assertion that the file exists,
+	// without introducing a TOCTOU flaw.
+	http.ServeContent(w, r, fu.FileName, modtime, file)
+}
+
+func (rl *rushlink) viewPasteHandlerInnerMeta(w http.ResponseWriter, r *http.Request, p *db.Paste, fu *db.FileUpload) {
+	var cd canDelete
+	deleteToken := getDeleteTokenFromRequest(r)
+	if deleteToken != "" {
+		if subtle.ConstantTimeCompare([]byte(deleteToken), []byte(p.DeleteToken)) == 1 {
+			cd = canDeleteYes
+		} else {
+			cd = canDeleteNo
+		}
+	}
+
+	var fileExt string
+	if fu != nil {
+		fileExt = fu.Ext()
+	}
+	data := map[string]interface{}{
+		"Paste":           p,
+		"FileExt":         fileExt,
+		"CanDeleteString": cd.String(),
+		"CanDeleteBool":   cd.Bool(),
+	}
+	var status int
+	if p.State == db.PasteStateDeleted {
+		status = http.StatusGone
+	} else {
+		status = http.StatusOK
+	}
+	rl.render(w, r, status, "pasteMeta", data)
+}
+
+func (rl *rushlink) viewActionSuccess(w http.ResponseWriter, r *http.Request, p *db.Paste, fu *db.FileUpload) {
+	var fileExt string
+	if fu != nil {
+		fileExt = fu.Ext()
+	}
+	// Redirect to the new paste.
+	pasteURL := url.URL{
+		Path:     fmt.Sprintf("/%s%s/meta", p.Key, fileExt),
+		RawQuery: fmt.Sprintf("deleteToken=%s", url.QueryEscape(p.DeleteToken)),
+	}
+	http.Redirect(w, r, pasteURL.String(), http.StatusFound)
+	// But still render the page for CURL-like clients.
+	cd := canDeleteYes
+	data := map[string]interface{}{
+		"Paste":           p,
+		"FileExt":         fileExt,
+		"CanDeleteString": cd.String(),
+		"CanDeleteBool":   cd.Bool(),
+	}
+	rl.render(w, r, 0, "pasteMeta", data)
+}
+
+func (rl *rushlink) newPasteHandler(w http.ResponseWriter, r *http.Request) {
+	if err := r.ParseMultipartForm(formParseMaxMemory); err != nil {
+		msg := fmt.Sprintf("could not parse form: %v\n", err)
+		rl.renderError(w, r, http.StatusBadRequest, msg)
+		return
+	}
+
+	fileHeaders, fileHeadersPrs := r.MultipartForm.File["file"]
+	shortens, shortensPrs := r.MultipartForm.Value["shorten"]
+
+	if !shortensPrs && !fileHeadersPrs {
+		rl.renderError(w, r, http.StatusBadRequest, "no 'file' and no 'shorten' fields given in form\n")
+		return
+	}
+	if shortensPrs && fileHeadersPrs {
+		rl.renderError(w, r, http.StatusBadRequest, "both 'file' and 'shorten' fields provided in form\n")
+		return
+	}
+	if shortensPrs {
+		rl.newRedirectPasteHandler(w, r, shortens[0])
+		return
+	}
+	if fileHeadersPrs {
+		fileHeader := fileHeaders[0]
+		file, err := fileHeader.Open()
+		if err != nil {
+			rl.renderInternalServerError(w, r, err)
+			return
+		}
+		rl.newFileUploadPasteHandler(w, r, file, *fileHeader)
+		return
+	}
+}
+
+func (rl *rushlink) newFileUploadPasteHandler(w http.ResponseWriter, r *http.Request, file multipart.File, header multipart.FileHeader) {
+	var fu *db.FileUpload
+	var paste *db.Paste
+	if err := rl.db.Transaction(func(tx *db.Database) error {
+		var err error
+		fu, err = db.NewFileUpload(rl.fs, file, header.Filename)
+		if err != nil {
+			panic(errors.Wrap(err, "creating fileUpload"))
+		}
+		if err := fu.Save(tx); err != nil {
+			panic(errors.Wrap(err, "saving fileUpload in db"))
+		}
+
+		paste, err = shortenFileUploadID(tx, fu.PubID)
+		return err
+	}); err != nil {
+		panic(err)
+	}
+	rl.viewActionSuccess(w, r, paste, fu)
+}
+
+func (rl *rushlink) newRedirectPasteHandler(w http.ResponseWriter, r *http.Request, rawurl string) {
+	userURL, err := url.Parse(rawurl)
+	if err != nil {
+		msg := fmt.Sprintf("invalid url (%v): %v", err, rawurl)
+		rl.renderError(w, r, http.StatusBadRequest, msg)
+		return
+	}
+	if userURL.Scheme == "" {
+		rl.renderError(w, r, http.StatusBadRequest, "invalid url (unspecified scheme)\n")
+		return
+	}
+	if userURL.Host == "" {
+		rl.renderError(w, r, http.StatusBadRequest, "invalid url (unspecified host)\n")
+		return
+	}
+
+	var paste *db.Paste
+	if err := rl.db.Transaction(func(tx *db.Database) error {
+		var err error
+		paste, err = shortenURL(tx, userURL)
+		return err
+	}); err != nil {
+		panic(err)
+	}
+	rl.viewActionSuccess(w, r, paste, nil)
+}
+
+// Delete a URL from the database
+func (rl *rushlink) deletePasteHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	key := vars["key"]
+
+	deleteToken := getDeleteTokenFromRequest(r)
+	if deleteToken == "" {
+		rl.renderError(w, r, http.StatusBadRequest, "no delete token provided\n")
+		return
+	}
+
+	var errorCode int
+	var paste *db.Paste
+	if err := rl.db.Transaction(func(tx *db.Database) error {
+		var err error
+		paste, err = db.GetPaste(tx, key)
+		if err != nil {
+			errorCode = http.StatusNotFound
+			return err
+		}
+		if paste.State == db.PasteStateDeleted {
+			errorCode = http.StatusGone
+			return errors.New("already deleted")
+		}
+		if subtle.ConstantTimeCompare([]byte(deleteToken), []byte(paste.DeleteToken)) == 0 {
+			errorCode = http.StatusForbidden
+			return errors.New("invalid delete token")
+		}
+		if err := paste.Delete(tx, rl.fs); err != nil {
+			errorCode = http.StatusInternalServerError
+			return err
+		}
+		return nil
+	}); err != nil {
+		log.Printf("error: %v\n", err)
+		rl.renderError(w, r, errorCode, fmt.Sprintf("error: %v\n", err))
+		return
+	}
+	rl.viewActionSuccess(w, r, paste, nil)
+}
+
+// Add a new fileUpload redirect to the database
+//
+// Returns the new paste key if the fileUpload was successfully added to the
+// database
+func shortenFileUploadID(tx *db.Database, id uuid.UUID) (*db.Paste, error) {
+	return shorten(tx, db.PasteTypeFileUpload, id[:])
+}
+
+// Add a new URL to the database
+//
+// Returns the new paste key if the url was successfully shortened
+func shortenURL(tx *db.Database, userURL *url.URL) (*db.Paste, error) {
+	return shorten(tx, db.PasteTypeRedirect, []byte(userURL.String()))
+}
+
+// Add a paste (of any kind) to the database with arbitrary content.
+func shorten(tx *db.Database, ty db.PasteType, content []byte) (*db.Paste, error) {
+	// Generate the paste key
+	var keyEntropy int
+	if ty == db.PasteTypeFileUpload || ty == db.PasteTypePaste {
+		keyEntropy = highOnlineEntropy
+	}
+	pasteKey, err := db.GeneratePasteKey(tx, keyEntropy)
+	if err != nil {
+		return nil, errors.Wrap(err, "generating paste key")
+	}
+
+	// Also generate a deleteToken
+	deleteToken, err := db.GenerateDeleteToken()
+	if err != nil {
+		return nil, errors.Wrap(err, "generating delete token")
+	}
+
+	// Store the new key
+	p := db.Paste{
+		Type:        ty,
+		State:       db.PasteStatePresent,
+		Content:     content,
+		Key:         pasteKey,
+		DeleteToken: deleteToken,
+	}
+	if err := p.Save(tx); err != nil {
+		return nil, err
+	}
+	return &p, nil
+}
+
+func getDeleteTokenFromRequest(r *http.Request) string {
+	return r.URL.Query().Get("deleteToken")
+}

handlers/handlers.go

@@ -1,253 +0,0 @@
-package handlers
-
-import (
-	"crypto/subtle"
-	"encoding/base64"
-	"fmt"
-	"log"
-	"net/http"
-	"net/url"
-	"time"
-
-	"github.com/gorilla/mux"
-	"github.com/pkg/errors"
-	bolt "go.etcd.io/bbolt"
-
-	"gitea.hashru.nl/dsprenkels/rushlink/db"
-)
-
-type viewPaste uint
-
-const (
-	_ viewPaste = 1 << iota
-	viewNoRedirect
-	viewShowMeta
-)
-
-const CookieDeleteToken = "owner_token"
-
-// These keys are designated reserved, and will not be randomly chosen
-var ReservedPasteKeys = []string{"xd42", "example"}
-
-// Base64 encoding and decoding
-var base64Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
-var base64Encoder = base64.RawURLEncoding.WithPadding(base64.NoPadding)
-
-func (t pasteType) String() string {
-	switch t {
-	case typeUndef:
-		return "unknown"
-	case typePaste:
-		return "paste"
-	case typeRedirect:
-		return "redirect"
-	default:
-		return "invalid"
-	}
-}
-
-func (t pasteState) String() string {
-	switch t {
-	case stateUndef:
-		return "unknown"
-	case statePresent:
-		return "present"
-	case stateDeleted:
-		return "deleted"
-	default:
-		return "invalid"
-	}
-}
-
-func indexGetHandler(w http.ResponseWriter, r *http.Request) {
-	render(w, r, "index", map[string]interface{}{})
-}
-
-func viewPasteHandler(w http.ResponseWriter, r *http.Request) {
-	viewPasteHandlerInner(w, r, 0)
-}
-
-func viewPasteHandlerNoRedirect(w http.ResponseWriter, r *http.Request) {
-	viewPasteHandlerInner(w, r, viewNoRedirect)
-}
-
-func viewPasteHandlerMeta(w http.ResponseWriter, r *http.Request) {
-	viewPasteHandlerInner(w, r, viewShowMeta)
-}
-
-func viewPasteHandlerInner(w http.ResponseWriter, r *http.Request, flags viewPaste) {
-	vars := mux.Vars(r)
-	key := vars["key"]
-	var p *paste
-	if err := db.DB.View(func(tx *bolt.Tx) error {
-		var err error
-		p, err = getPaste(tx, key)
-		return err
-	}); err != nil {
-		panic(err)
-		return
-	}
-	if p == nil {
-		renderError(w, r, http.StatusNotFound, "url key not found in the database")
-		return
-	}
-
-	if flags&viewShowMeta != 0 {
-		canDelete := struct {
-			Bool   bool
-			String string
-		}{Bool: false}
-		deleteToken := getDeleteTokenFromRequest(r)
-		if deleteToken == "" {
-			canDelete.String = "undefined"
-		} else {
-			if subtle.ConstantTimeCompare([]byte(deleteToken), []byte(p.DeleteToken)) == 1 {
-				canDelete.Bool = true
-				canDelete.String = "correct"
-			} else {
-				canDelete.String = "invalid"
-			}
-		}
-
-		data := map[string]interface{}{
-			"Paste":     p,
-			"CanDelete": canDelete,
-		}
-		render(w, r, "pasteMeta", data)
-		return
-	}
-
-	switch p.State {
-	case statePresent:
-		if flags&viewNoRedirect == 0 {
-			rawurl := string(p.Content)
-			urlParse, err := url.Parse(rawurl)
-			if err != nil {
-				panic(errors.Wrapf(err, "invalid URL ('%v') in database for key '%v'", rawurl, p.Key))
-			}
-			http.Redirect(w, r, urlParse.String(), http.StatusSeeOther)
-		}
-		w.Write(p.Content)
-	case stateDeleted:
-		renderError(w, r, http.StatusGone, "paste has been deleted")
-	default:
-		panic(errors.Errorf("invalid paste.State (%v) for key '%v'", p.State, p.Key))
-	}
-}
-
-func newPasteHandler(w http.ResponseWriter, r *http.Request) {
-	if err := r.ParseMultipartForm(50 * 1000 * 1000); err != nil {
-		panic(err)
-	}
-
-	// Determine what kind of post this is, currently only `shorten=...`
-	if len(r.PostForm) == 0 {
-		renderError(w, r, http.StatusBadRequest, "empty body in POST request\n")
-		return
-	}
-	shorten_values, prs := r.PostForm["shorten"]
-	if !prs {
-		renderError(w, r, http.StatusBadRequest, "no 'shorten' param given\n")
-		return
-	}
-	if len(shorten_values) != 1 {
-		renderError(w, r, http.StatusBadRequest, "only one 'shorten' param is allowed per request\n")
-		return
-	}
-
-	newRedirectPasteHandler(w, r)
-}
-
-func newRedirectPasteHandler(w http.ResponseWriter, r *http.Request) {
-	rawurl := r.PostForm.Get("shorten")
-	userURL, err := url.ParseRequestURI(rawurl)
-	if err != nil {
-		msg := fmt.Sprintf("invalid url (%v): %v", err, rawurl)
-		renderError(w, r, http.StatusBadRequest, msg)
-		return
-	}
-	if userURL.Scheme == "" {
-		renderError(w, r, http.StatusBadRequest, "invalid url (unspecified scheme)")
-		return
-	}
-	if userURL.Host == "" {
-		renderError(w, r, http.StatusBadRequest, "invalid url (unspecified host)")
-		return
-	}
-
-	var paste *paste
-	if err := db.DB.Update(func(tx *bolt.Tx) error {
-		// Generate a new delete token for this paste
-		var err error
-		paste, err = shortenURL(tx, userURL)
-		return err
-	}); err != nil {
-		panic(err)
-	}
-	data := map[string]interface{}{"Paste": paste}
-	render(w, r, "newRedirectPasteSuccess", data)
-}
-
-// Delete a URL from the database
-func deletePasteHandler(w http.ResponseWriter, r *http.Request) {
-	vars := mux.Vars(r)
-	key := vars["key"]
-
-	deleteToken := getDeleteTokenFromRequest(r)
-	if deleteToken == "" {
-		renderError(w, r, http.StatusBadRequest, "no delete token provided")
-		return
-	}
-
-	var errorCode int
-	if err := db.DB.Update(func(tx *bolt.Tx) error {
-		p, err := getPaste(tx, key)
-		if err != nil {
-			errorCode = http.StatusNotFound
-			return err
-		}
-		if subtle.ConstantTimeCompare([]byte(deleteToken), []byte(p.DeleteToken)) == 1 {
-			p.delete(tx)
-		}
-		errorCode = http.StatusForbidden
-		return errors.New("invalid delete token")
-	}); err != nil {
-		log.Printf("error: %v\n", err)
-		renderError(w, r, errorCode, fmt.Sprintf("error: %v", err))
-		return
-	}
-}
-
-// Add a new URL to the database
-//
-// Returns the new ID if the url was successfully shortened
-func shortenURL(tx *bolt.Tx, userURL *url.URL) (*paste, error) {
-	pasteKey, err := generatePasteKey(tx)
-	if err != nil {
-		return nil, errors.Wrap(err, "generating paste key")
-	}
-
-	// Also generate a deleteToken
-	deleteToken, err := generateDeleteToken()
-	if err != nil {
-		return nil, errors.Wrap(err, "generating delete token")
-	}
-
-	// Store the new key
-	p := paste{
-		Type:        typeRedirect,
-		State:       statePresent,
-		Content:     []byte(userURL.String()),
-		Key:         pasteKey,
-		DeleteToken: deleteToken,
-		TimeCreated: time.Now().UTC(),
-	}
-	if err := p.save(tx); err != nil {
-		return nil, err
-	}
-	return &p, nil
-}
-
-func getDeleteTokenFromRequest(r *http.Request) string {
-	return r.URL.Query().Get("deleteToken")
-}

handlers/paste.go

@@ -1,159 +0,0 @@
-package handlers
-
-import (
-	"crypto/rand"
-	"encoding/hex"
-	"strings"
-	"time"
-
-	"gitea.hashru.nl/dsprenkels/rushlink/db"
-	"gitea.hashru.nl/dsprenkels/rushlink/gobmarsh"
-	"github.com/pkg/errors"
-	bolt "go.etcd.io/bbolt"
-)
-
-type pasteType int
-type pasteState int
-
-type paste struct {
-	Type        pasteType
-	State       pasteState
-	Content     []byte
-	Key         string
-	DeleteToken string
-	TimeCreated time.Time
-}
-
-const (
-	typeUndef    pasteType = 0
-	typePaste              = 1
-	typeRedirect           = 2
-)
-
-const (
-	stateUndef   pasteState = 0
-	statePresent            = 1
-	stateDeleted            = 2
-)
-
-// Retrieve a paste from the database
-func getPaste(tx *bolt.Tx, key string) (*paste, error) {
-	pastesBucket := tx.Bucket([]byte(db.BUCKET_PASTES))
-	if pastesBucket == nil {
-		return nil, errors.Errorf("bucket %v does not exist", db.BUCKET_PASTES)
-	}
-	storedBytes := pastesBucket.Get([]byte(key))
-	if storedBytes == nil {
-		return nil, nil
-	}
-	p := &paste{}
-	err := gobmarsh.Unmarshal(storedBytes, p)
-	return p, err
-}
-
-func (p *paste) save(tx *bolt.Tx) error {
-	bucket := tx.Bucket([]byte(db.BUCKET_PASTES))
-	if bucket == nil {
-		return errors.Errorf("bucket %v does not exist", db.BUCKET_PASTES)
-	}
-
-	buf, err := gobmarsh.Marshal(p)
-	if err != nil {
-		return errors.Wrap(err, "encoding for database failed")
-	}
-	if err := bucket.Put([]byte(p.Key), buf); err != nil {
-		return errors.Wrap(err, "database transaction failed")
-	}
-	return nil
-}
-
-func (p paste) delete(tx *bolt.Tx) error {
-	// Replace the old paste with a new empty paste
-	return (&paste{
-		Key:         p.Key,
-		State:       stateDeleted,
-		DeleteToken: p.DeleteToken,
-	}).save(tx)
-}
-
-// Generate a key until it is not in the database, this occurs in O(log N),
-// where N is the amount of keys stored in the url-shorten database.
-func generatePasteKey(tx *bolt.Tx) (string, error) {
-	pastesBucket := tx.Bucket([]byte(db.BUCKET_PASTES))
-	if pastesBucket == nil {
-		return "", errors.Errorf("bucket %v does not exist", db.BUCKET_PASTES)
-	}
-
-	epoch := 0
-	var key string
-	for {
-		var err error
-		key, err = generatePasteKeyInner(epoch)
-		if err != nil {
-			return "", errors.Wrap(err, "url-key generation failed")
-		}
-
-		found := pastesBucket.Get([]byte(key))
-		if found == nil {
-			break
-		}
-
-		isReserved := false
-		for _, reservedKey := range ReservedPasteKeys {
-			if strings.HasPrefix(key, reservedKey) {
-				isReserved = true
-				break
-			}
-		}
-		if !isReserved {
-			break
-		}
-
-		epoch++
-	}
-	return key, nil
-}
-
-func generatePasteKeyInner(epoch int) (string, error) {
-	urlKey := make([]byte, 4+epoch)
-	_, err := rand.Read(urlKey)
-	if err != nil {
-		return "", err
-	}
-	// Put all the values in the range 0..64 for easier base64-encoding
-	for i := 0; i < len(urlKey); i++ {
-		urlKey[i] &= 0x3F
-	}
-	// Implement truncate-resistance by forcing the prefix to
-	//     0b111110xxxxxxxxxx
-	//       ^----- {epoch} ones followed by a single 0
-	//
-	// Example when epoch is 1: prefix is 0b10.
-	i := 0
-	for i < epoch {
-		// Set this bit to 1
-		limb := i / 6
-		bit := i % 6
-		urlKey[limb] |= 1 << uint(5-bit)
-		i++
-	}
-	// Finally set the next bit to 0
-	limb := i / 6
-	bit := i % 6
-	urlKey[limb] &= ^(1 << uint(5-bit))
-
-	// Convert this ID to a canonical base64 notation
-	for i := range urlKey {
-		urlKey[i] = base64Alphabet[urlKey[i]]
-	}
-	return string(urlKey), nil
-}
-
-func generateDeleteToken() (string, error) {
-	var deleteToken [16]byte
-	_, err := rand.Read(deleteToken[:])
-	if err != nil {
-		return "", err
-	}
-	return hex.EncodeToString(deleteToken[:]), nil
-}

handlers/router.go

@@ -1,50 +0,0 @@
-package handlers
-
-import (
-	"fmt"
-	"log"
-	"net/http"
-	"time"
-
-	"github.com/gorilla/mux"
-)
-
-func recoveryMiddleware(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		defer func() {
-			defer func() {
-				if err := recover(); err != nil {
-					log.Printf("error: panic while recovering from another panic: %v\n", err)
-					fmt.Fprintf(w, "internal server error: %v\n", err)
-				}
-			}()
-
-			if err := recover(); err != nil {
-				log.Printf("error: %v\n", err)
-				renderInternalServerError(w, r, err)
-			}
-		}()
-		next.ServeHTTP(w, r)
-	})
-}
-
-func StartMainServer() {
-	// Initialize Gorilla router
-	router := mux.NewRouter()
-	router.Use(recoveryMiddleware)
-	router.HandleFunc("/", indexGetHandler).Methods("GET")
-	router.HandleFunc("/", newPasteHandler).Methods("POST")
-	router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}", viewPasteHandler).Methods("GET")
-	router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}/nr", viewPasteHandlerNoRedirect).Methods("GET")
-	router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}/meta", viewPasteHandlerMeta).Methods("GET")
-	router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}", deletePasteHandler).Methods("DELETE")
-	router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}/delete", deletePasteHandler).Methods("POST")
-
-	srv := &http.Server{
-		Handler:      router,
-		Addr:         "127.0.0.1:8000",
-		WriteTimeout: 15 * time.Second,
-		ReadTimeout:  15 * time.Second,
-	}
-	log.Fatal(srv.ListenAndServe())
-}

handlers_test.go

@@ -0,0 +1,222 @@
+package rushlink
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
+	"github.com/gorilla/mux"
+)
+
+// createTemporaryRouter initializes a rushlink instance, with temporary
+// filestore and database.
+//
+// It will use testing.T.Cleanup to cleanup after itself.
+func createTemporaryRouter(t *testing.T) (*mux.Router, *rushlink) {
+	tempDir, err := ioutil.TempDir("", "rushlink-tmp-*")
+	if err != nil {
+		t.Fatalf("creating temporary directory: %s\n", err)
+	}
+	t.Cleanup(func() {
+		os.RemoveAll(tempDir)
+	})
+
+	fileStore, err := db.OpenFileStore(filepath.Join(tempDir, "filestore"))
+	if err != nil {
+		t.Fatalf("opening temporary filestore: %s\n", err)
+	}
+
+	os.Setenv(db.EnvDatabaseDriver, "sqlite")
+	os.Setenv(db.EnvDatabasePath, "file::memory:?cache=shared")
+
+	database, err := db.OpenDBFromEnvironment()
+	if err != nil {
+		t.Fatalf("opening temporary database: %v\n", err)
+	}
+	database.Debug()
+	if err := db.Gormigrate(database).Migrate(); err != nil {
+		t.Fatalf("migration failed: %v\n", err)
+	}
+
+	// *.invalid. is guaranteed not to exist (RFC 6761).
+	rootURL, err := url.Parse("https://rushlink.invalid")
+	if err != nil {
+		t.Fatalf("parsing URL: %s\n", err)
+	}
+
+	rl := rushlink{
+		db:      database,
+		fs:      fileStore,
+		rootURL: rootURL,
+	}
+	r := mux.NewRouter()
+	InitMainRouter(r, &rl)
+	return r, &rl
+}
+
+// checkStatusCode checks whether the status code from a recorded response is equal
+// to some response code.
+func checkStatusCode(t *testing.T, rr *httptest.ResponseRecorder, code int) {
+	if actual := rr.Code; actual != code {
+		t.Logf("request body:\n%v\n", rr.Body.String())
+		t.Fatalf("handler returned wrong status code: got %v want %v\n",
+			actual, code)
+	}
+}
+
+// checkLocationHeader checks whether the status code from a recorded response is equal
+// to some expected URL.
+func checkLocationHeader(t *testing.T, rr *httptest.ResponseRecorder, expected string) {
+	location := rr.Header().Get("Location")
+	if location != expected {
+		t.Fatalf("handler returned bad redirect location: got %v want %v", location, expected)
+	}
+}
+
+func TestIssue43(t *testing.T) {
+	srv, _ := createTemporaryRouter(t)
+
+	// Put a URL with a fragment identifier into the database.
+	var body bytes.Buffer
+	form := multipart.NewWriter(&body)
+	form.WriteField("shorten", "https://example.com#fragment")
+	form.Close()
+	req, err := http.NewRequest("POST", "/", bytes.NewReader(body.Bytes()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Add("Content-Type", form.FormDataContentType())
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusFound)
+	rawURL := strings.SplitN(rr.Body.String(), "\n", 2)[0]
+	pasteURL, err := url.Parse(rawURL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Check if the URL was encoded correctly.
+	req, err = http.NewRequest("GET", pasteURL.Path, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req = mux.SetURLVars(req, map[string]string{"key": pasteURL.Path[1:]})
+	rr = httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusTemporaryRedirect)
+	checkLocationHeader(t, rr, "https://example.com#fragment")
+}
+
+func TestIssue53(t *testing.T) {
+	srv, rl := createTemporaryRouter(t)
+
+	// Put a URL with a fragment identifier into the database.
+	var body bytes.Buffer
+	form := multipart.NewWriter(&body)
+	if _, err := form.CreateFormFile("file", "../directory-traversal/file.txt"); err != nil {
+		t.Fatal(err)
+	}
+	form.Close()
+	req, err := http.NewRequest("POST", "/", bytes.NewReader(body.Bytes()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Add("Content-Type", form.FormDataContentType())
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusFound)
+
+	// Check that any attempt to do directory traversal has failed.
+	rl.db.Transaction(func(tx *db.Database) error {
+		fus, err := db.AllFileUploads(tx)
+		if err != nil {
+			t.Fatal(err)
+		}
+		for _, fu := range fus {
+			if strings.ContainsAny(fu.FileName, "/\\") {
+				t.Fatalf(fmt.Sprintf("found a slash in file name: %v", fu.FileName))
+			}
+		}
+		return nil
+	})
+}
+
+func TestIssue60(t *testing.T) {
+	srv, _ := createTemporaryRouter(t)
+
+	// Request a nonexistent static file
+	req, err := http.NewRequest("GET", "/css/nonexistent_file.css", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusNotFound)
+}
+
+func TestIssue56(t *testing.T) {
+	srv, _ := createTemporaryRouter(t)
+
+	// Make a POST request with both a 'file' *and* a 'shorten' part.
+	var body bytes.Buffer
+	form := multipart.NewWriter(&body)
+	if _, err := form.CreateFormFile("file", "empty.txt"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := form.CreateFormField("shorten"); err != nil {
+		t.Fatal(err)
+	}
+	form.Close()
+	req, err := http.NewRequest("POST", "/", bytes.NewReader(body.Bytes()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Add("Content-Type", form.FormDataContentType())
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusBadRequest)
+}
+
+func TestIssue68(t *testing.T) {
+	srv, _ := createTemporaryRouter(t)
+	originalURL := "https://example.com"
+
+	var body bytes.Buffer
+	form := multipart.NewWriter(&body)
+	form.WriteField("shorten", "https://example.com")
+	form.Close()
+	req, err := http.NewRequest("POST", "/", bytes.NewReader(body.Bytes()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Add("Content-Type", form.FormDataContentType())
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusFound)
+	rawURL := strings.SplitN(rr.Body.String(), "\n", 2)[0]
+	pasteURL, err := url.Parse(rawURL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Check if the no-redirect handler works properly.
+	req, err = http.NewRequest("GET", pasteURL.Path+"/nr", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	rr = httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	checkStatusCode(t, rr, http.StatusOK)
+	if rr.Body.String() != originalURL {
+		t.Errorf("incorrect URL = %v, want %v", rr.Body.String(), originalURL)
+	}
+}

internal/db/db.go

@@ -0,0 +1,74 @@
+package db
+
+import (
+	"log"
+	"os"
+	"time"
+
+	"github.com/pkg/errors"
+	"gorm.io/driver/postgres"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+const (
+	// EnvDatabaseDriver is the key for the 'database driver' environment variable.
+	EnvDatabaseDriver = "RUSHLINK_DATABASE_DRIVER"
+	// EnvDatabasePath is the key for the 'database path' environment variable.
+	EnvDatabasePath = "RUSHLINK_DATABASE_PATH"
+	// EnvPostgresURL is the key for the 'postgresql URL' environment variable.
+	EnvPostgresURL = "RUSHLINK_POSTGRES_URL"
+	// EnvFileStorePath is the key for the environment variable locating the file store.
+	EnvFileStorePath = "RUSHLINK_FILE_STORE_PATH"
+)
+
+// Database is the main rushlink database type.
+//
+// Open a database using OpenDBFromEnvironment(). Closing is not necessary.
+// Only one instance of DB should exist in a program at any moment.
+type Database = gorm.DB
+
+var (
+	gormLogger logger.Interface = logger.New(log.New(os.Stdout, "\r\n", log.LstdFlags), logger.Config{
+		SlowThreshold: 50 * time.Millisecond,
+		LogLevel:      logger.Warn,
+		Colorful:      true,
+	})
+	gormConfig = gorm.Config{Logger: gormLogger, PrepareStmt: true}
+)
+
+// OpenDBFromEnvironment tries to open an SQL database, described by
+func OpenDBFromEnvironment() (*Database, error) {
+	const envNotSetMsg = "%v environment variable is not set"
+
+	driver, prs := os.LookupEnv(EnvDatabaseDriver)
+	if !prs {
+		return nil, errors.Errorf(envNotSetMsg, EnvDatabaseDriver)
+	}
+	switch driver {
+	case "sqlite":
+		path, prs := os.LookupEnv(EnvDatabasePath)
+		if !prs {
+			return nil, errors.Errorf(envNotSetMsg, EnvDatabasePath)
+		}
+		db, err := gorm.Open(sqlite.Open(path), &gormConfig)
+		if err != nil {
+			return nil, err
+		}
+		return db, nil
+	case "postgres":
+		dsn, prs := os.LookupEnv(EnvPostgresURL)
+		if !prs {
+			return nil, errors.Errorf(envNotSetMsg, EnvPostgresURL)
+		}
+		db, err := gorm.Open(postgres.Open(dsn), &gormConfig)
+		if err != nil {
+			return nil, err
+		}
+		return db, nil
+	default:
+		return nil, errors.Errorf("RUSHLINK_DATABASE_DRIVER should be either 'sqlite' or 'postgres' (not '%v'), "+
+			"for more info see <https://stackoverflow.com/q/3582552/5207081>", driver)
+	}
+}

internal/db/fileupload.go

@@ -0,0 +1,240 @@
+package db
+
+import (
+	"bytes"
+	"encoding/hex"
+	"hash/crc32"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"path/filepath"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/pkg/errors"
+	"gorm.io/gorm"
+)
+
+// Use the Castagnoli checksum because of the acceleration on Intel CPUs
+var checksumTable = crc32.MakeTable(crc32.Castagnoli)
+
+// FileStore holds the path to a file storage location.
+type FileStore struct {
+	path string
+}
+
+// FileUploadState determines the current state of a FileUpload object.
+type FileUploadState int
+
+// FileUpload models an uploaded file.
+type FileUpload struct {
+	ID uint `gorm:"primaryKey"`
+
+	// State of the FileUpload (present/deleted/etc).
+	State FileUploadState `gorm:"index"`
+
+	// UUID publically identifies this FileUpload.
+	PubID uuid.UUID `gorm:"uniqueIndex"`
+
+	// FileName contains the original filename of this FileUpload.
+	FileName string
+
+	// Content type as determined by http.DetectContentType.
+	ContentType string
+
+	// Checksum holds a crc32c checksum of the file.
+	//
+	// This checksum is only meant to allow for the detection of random
+	// database corruption.
+	Checksum uint32
+
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	DeletedAt gorm.DeletedAt
+}
+
+const (
+	dirMode  os.FileMode = 0750
+	fileMode os.FileMode = 0640
+)
+
+const (
+	// FileUploadStateUndef is an undefined FileUpload.
+	FileUploadStateUndef FileUploadState = 0
+	// FileUploadStatePresent denotes the normal (existing) state.
+	FileUploadStatePresent FileUploadState = 1
+	// FileUploadStateDeleted denotes a deleted state.
+	FileUploadStateDeleted FileUploadState = 2
+)
+
+func (t FileUploadState) String() string {
+	switch t {
+	case FileUploadStateUndef:
+		return "unknown"
+	case FileUploadStatePresent:
+		return "present"
+	case FileUploadStateDeleted:
+		return "deleted"
+	default:
+		return "invalid"
+	}
+}
+
+// ErrFileUploadDoesNotExist occurs when a key does not exist in the database.
+var ErrFileUploadDoesNotExist = errors.New("file not found in the database")
+
+// OpenFileStoreFromEnvironment tries to open a file store located at ${RUSHLINK_FILE_STORE_PATH}.
+func OpenFileStoreFromEnvironment() (*FileStore, error) {
+	path, prs := os.LookupEnv(EnvFileStorePath)
+	if !prs {
+		err := errors.Errorf("%v environment variable is not set", EnvFileStorePath)
+		return nil, errors.Wrap(err, "opening file store")
+	}
+	return OpenFileStore(path)
+}
+
+// OpenFileStore opens the file storage at path.
+func OpenFileStore(path string) (*FileStore, error) {
+	if path == "" {
+		return nil, errors.New("file-store not set")
+	}
+
+	// Try to create the file store directory if it does not yet exist
+	if err := os.MkdirAll(path, dirMode); err != nil {
+		return nil, errors.Wrap(err, "creating file store directory")
+	}
+
+	return &FileStore{path[:]}, nil
+}
+
+// Path returns the path of the FileStore root.
+func (fs *FileStore) Path() string {
+	return fs.path
+}
+
+// filePath resolves the path of a file in the FileStore given some id and filename.
+func (fs *FileStore) filePath(pubID uuid.UUID, fileName string) string {
+	if fs.path == "" {
+		panic("fileStoreDir called while the file store path has not been set")
+	}
+	return path.Join(fs.path, hex.EncodeToString(pubID[:]), fileName)
+}
+
+// NewFileUpload creates a new FileUpload object.
+//
+// Internally, this function detects the type of the file stored in `r` using
+// `http.DetectContentType`.
+func NewFileUpload(fs *FileStore, r io.Reader, fileName string) (*FileUpload, error) {
+	// Generate a file ID
+	pubID, err := uuid.NewRandom()
+	if err != nil {
+		return nil, errors.Wrap(err, "generating UUID")
+	}
+
+	// Construct a checksum for this file
+	hash := crc32.New(checksumTable)
+	tee := io.TeeReader(r, hash)
+
+	// Detect the file type
+	var tmpBuf bytes.Buffer
+	tmpBuf.Grow(512)
+	io.CopyN(&tmpBuf, tee, 512)
+	contentType := http.DetectContentType(tmpBuf.Bytes())
+
+	// Open the file on disk for writing
+	baseName := filepath.Base(fileName)
+	filePath := fs.filePath(pubID, baseName)
+	if err := os.Mkdir(path.Dir(filePath), dirMode); err != nil {
+		return nil, errors.Wrap(err, "creating file dir")
+	}
+	file, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE, fileMode)
+	if err != nil {
+		return nil, errors.Wrap(err, "opening file")
+	}
+	defer file.Close()
+
+	// Write the file to disk
+	_, err = io.Copy(file, &tmpBuf)
+	if err != nil {
+		return nil, errors.Wrap(err, "writing to file")
+	}
+	_, err = io.Copy(file, tee)
+	if err != nil {
+		return nil, errors.Wrap(err, "writing to file")
+	}
+
+	fu := &FileUpload{
+		State:       FileUploadStatePresent,
+		PubID:       pubID,
+		FileName:    baseName,
+		ContentType: contentType,
+		Checksum:    hash.Sum32(),
+	}
+	return fu, nil
+}
+
+// GetFileUpload tries to retrieve a FileUpload object from the bolt database.
+func GetFileUpload(db *gorm.DB, pubID uuid.UUID) (*FileUpload, error) {
+	var fus []FileUpload
+	if err := db.Unscoped().Limit(1).Where("pub_id = ?", pubID).Find(&fus).Error; err != nil {
+		return nil, err
+	}
+	if len(fus) == 0 {
+		return nil, ErrFileUploadDoesNotExist
+	}
+	return &fus[0], nil
+}
+
+// AllFileUploads tries to retrieve all FileUpload objects from the bolt database.
+func AllFileUploads(db *gorm.DB) ([]FileUpload, error) {
+	var fus []FileUpload
+	if err := db.Find(&fus).Error; err != nil {
+		return nil, err
+	}
+	return fus, nil
+}
+
+// Save saves a FileUpload in the database.
+func (fu *FileUpload) Save(db *gorm.DB) error {
+	return db.Save(fu).Error
+}
+
+// Delete deletes a FileUpload from the database.
+func (fu *FileUpload) Delete(db *gorm.DB, fs *FileStore) error {
+	// Remove the file in the backend
+	filePath := fu.Path(fs)
+	if err := os.Remove(filePath); err != nil {
+		return err
+	}
+
+	// Update the file in the server
+	if err := db.Delete(fu).Error; err != nil {
+		return err
+	}
+
+	// Cleanup the parent directory
+	wrap := "deletion succeeded, but removing the file directory has failed"
+	return errors.Wrap(os.Remove(path.Dir(filePath)), wrap)
+}
+
+// Path returns the path to this FileUpload in the FileStore provided in fs.
+func (fu *FileUpload) Path(fs *FileStore) string {
+	return fs.filePath(fu.PubID, fu.FileName)
+}
+
+// URL returns the URL for the FileUpload.
+func (fu *FileUpload) URL() *url.URL {
+	rawurl := "/uploads/" + hex.EncodeToString(fu.PubID[:]) + "/" + fu.FileName
+	urlParse, err := url.Parse(rawurl)
+	if err != nil {
+		panic("could not construct /uploads/ url")
+	}
+	return urlParse
+}
+
+// Ext returns the extension of the file attached to this FileUpload.
+func (fu *FileUpload) Ext() string {
+	return filepath.Ext(fu.FileName)
+}

internal/db/migrate.go

@@ -0,0 +1,46 @@
+package db
+
+import (
+	"time"
+
+	gormigrate "github.com/go-gormigrate/gormigrate/v2"
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// Gormigrate returns a Gormigrate migrator for the database.
+func Gormigrate(db *gorm.DB) *gormigrate.Gormigrate {
+	return gormigrate.New(db, gormigrate.DefaultOptions, []*gormigrate.Migration{
+		{
+			ID: "202010251337",
+			Migrate: func(tx *gorm.DB) error {
+				type FileUpload struct {
+					ID          uint            `gorm:"primaryKey"`
+					State       FileUploadState `gorm:"index"`
+					PubID       uuid.UUID       `gorm:"uniqueIndex"`
+					FileName    string
+					ContentType string
+					Checksum    uint32
+					CreatedAt   time.Time
+					UpdatedAt   time.Time
+					DeletedAt   gorm.DeletedAt
+				}
+				type Paste struct {
+					ID          uint       `gorm:"primaryKey"`
+					Type        PasteType  `gorm:"index"`
+					State       PasteState `gorm:"index"`
+					Content     []byte
+					Key         string `gorm:"uniqueIndex"`
+					DeleteToken string
+					CreatedAt   time.Time
+					UpdatedAt   time.Time
+					DeletedAt   gorm.DeletedAt
+				}
+				return tx.AutoMigrate(&FileUpload{}, &Paste{})
+			},
+			Rollback: func(tx *gorm.DB) error {
+				return tx.Migrator().DropTable(&FileUpload{}, &Paste{})
+			},
+		},
+	})
+}

internal/db/paste.go

@@ -0,0 +1,305 @@
+package db
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/pkg/errors"
+	"gorm.io/gorm"
+)
+
+// PasteType describes the type of Paste (i.e. file, redirect, [...]).
+type PasteType int
+
+// PasteState describes the state of a Paste (i.e. present, deleted, [...]).
+type PasteState int
+
+// Paste describes the main Paste model in the database.
+type Paste struct {
+	ID          uint       `gorm:"primaryKey"`
+	Type        PasteType  `gorm:"index"`
+	State       PasteState `gorm:"index"`
+	Content     []byte
+	Key         string `gorm:"uniqueIndex"`
+	DeleteToken string
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+	DeletedAt   gorm.DeletedAt
+}
+
+// ReservedPasteKeys keys are designated reserved, and will not be randomly chosen.
+var ReservedPasteKeys = []string{"xd42", "example"}
+
+// Note: we use iota here. That means removals of PasteType* are not allowed,
+// because this changes the value of the constant. Please add the comment
+// "// deprecated" if you want to remove the constant. Additions are only
+// allowed at the bottom of this block, for the same reason.
+const (
+	PasteTypeUndef PasteType = iota
+	// PasteTypePaste is as of yet unused.  It is still unclear if this type
+	// will ever get a proper meaning.
+	PasteTypePaste
+	PasteTypeRedirect
+	PasteTypeFileUpload
+)
+
+// Note: we use iota here. See the comment above PasteType*
+const (
+	PasteStateUndef PasteState = iota
+	PasteStatePresent
+	PasteStateDeleted
+)
+
+// minKeyLen specifies the mimimum length of a paste key.
+const minKeyLen = 4
+
+var (
+	// ErrKeyInvalidChar occurs when a key contains an invalid character.
+	ErrKeyInvalidChar = errors.New("invalid character in key")
+	// ErrKeyInvalidLength occurs when a key embeds a length that is incorrect.
+	ErrKeyInvalidLength = errors.New("key length encoding is incorrect")
+	// ErrPasteDoesNotExist occurs when a key does not exist in the database.
+	ErrPasteDoesNotExist = errors.New("url key not found in the database")
+)
+
+// ErrHTTPStatusCode returns the HTTP status code that should correspond to
+// the provided error.
+// server error, or false if it is not.
+func ErrHTTPStatusCode(err error) int {
+	switch err {
+	case nil:
+		return 0
+	case gorm.ErrRecordNotFound, ErrKeyInvalidChar, ErrKeyInvalidLength, ErrPasteDoesNotExist:
+		return http.StatusNotFound
+	}
+	return http.StatusInternalServerError
+}
+
+// Base64 encoding and decoding
+var base64Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
+
+func (t PasteType) String() string {
+	switch t {
+	case PasteTypeUndef:
+		return "unknown"
+	case PasteTypePaste:
+		return "paste"
+	case PasteTypeRedirect:
+		return "redirect"
+	case PasteTypeFileUpload:
+		return "file"
+	default:
+		return "invalid"
+	}
+}
+
+func (t PasteState) String() string {
+	switch t {
+	case PasteStateUndef:
+		return "unknown"
+	case PasteStatePresent:
+		return "present"
+	case PasteStateDeleted:
+		return "deleted"
+	default:
+		return "invalid"
+	}
+}
+
+// GetPaste retrieves a paste from the database.
+func GetPaste(db *gorm.DB, key string) (*Paste, error) {
+	if err := ValidatePasteKey(key); err != nil {
+		return nil, err
+	}
+	return GetPasteNoValidate(db, key)
+}
+
+// ValidatePasteKey validates the format of the key that has
+func ValidatePasteKey(key string) error {
+	internalLen := minKeyLen
+	countingOnes := true
+	for _, ch := range key {
+		limb := strings.IndexRune(base64Alphabet, ch)
+		if limb == -1 {
+			return ErrKeyInvalidChar
+		}
+		for i := 5; i >= 0 && countingOnes; i-- {
+			if (limb>>uint(i))&0x1 == 0 {
+				countingOnes = false
+				break
+			}
+			internalLen++
+		}
+	}
+	if internalLen != len(key) {
+		return ErrKeyInvalidLength
+	}
+	return nil
+}
+
+// GetPasteNoValidate retrieves a paste from the database without validating
+// the key format first.
+func GetPasteNoValidate(db *gorm.DB, key string) (*Paste, error) {
+	var ps []Paste
+	if err := db.Unscoped().Limit(1).Where("key = ?", key).Find(&ps).Error; err != nil {
+		return nil, err
+	}
+	if len(ps) == 0 {
+		return nil, ErrPasteDoesNotExist
+	}
+	return &ps[0], nil
+}
+
+// Save saves this Paste to the database.
+func (p *Paste) Save(db *gorm.DB) error {
+	return db.Save(p).Error
+}
+
+// Delete deletes this Paste from the database.
+func (p *Paste) Delete(db *gorm.DB, fs *FileStore) error {
+	// Remove the (maybe) attached file
+	if p.Type == PasteTypeFileUpload {
+		fuID, err := uuid.FromBytes(p.Content)
+		if err != nil {
+			return errors.Wrap(err, "failed to parse uuid")
+		}
+		fu, err := GetFileUpload(db, fuID)
+		if err != nil {
+			return errors.Wrap(err, "failed to find file in database")
+		}
+		if err := fu.Delete(db, fs); err != nil {
+			return errors.Wrap(err, "failed to remove file")
+		}
+	}
+
+	// Wipe the old paste
+	p.Type = PasteTypeUndef
+	p.State = PasteStateDeleted
+	p.Content = []byte{}
+	if err := db.Save(&p).Error; err != nil {
+		return errors.Wrap(err, "failed to wipe paste in database")
+	}
+	// Soft-delete the paste as well
+	if err := db.Delete(&p).Error; err != nil {
+		return errors.Wrap(err, "failed to delete paste in database")
+	}
+	return nil
+}
+
+// RedirectURL returns the URL from this paste.
+//
+// This function assumes that the paste is valid.  If the paste struct is
+// corrupted in some way, this function will panic.
+func (p *Paste) RedirectURL() *url.URL {
+	if p.Type != PasteTypeRedirect {
+		panic("expected p.Type to be PasteTypeRedirect")
+	}
+	rawurl := string(p.Content)
+	urlParse, err := url.Parse(rawurl)
+	if err != nil {
+		panic(errors.Wrapf(err, "invalid URL ('%v') in database for key '%v'", rawurl, p.Key))
+	}
+	return urlParse
+}
+
+// GeneratePasteKey generates a new paste key. It will ensure that the newly
+// generated paste key does not already exist in the database.
+// The running time of this function is in O(log N), where N is the amount of
+// keys stored in the url-shorten database.
+// In tx, a Bolt transaction is given. Use minimumEntropy to set the mimimum
+// guessing entropy of the generated key.
+func GeneratePasteKey(db *gorm.DB, minimumEntropy int) (string, error) {
+	epoch := 0
+	var key string
+	for {
+		var err error
+		key, err = generatePasteKeyInner(epoch, minimumEntropy)
+		if err != nil {
+			return "", errors.Wrap(err, "url-key generation failed")
+		}
+
+		var count int64
+		db.Unscoped().Model(&Paste{}).Where("key = ?", []byte(key)).Count(&count)
+		if err != nil {
+			return "", errors.Wrap(err, "failed to check if key already exists")
+		}
+		alreadyInUse := count != 0
+
+		isReserved := false
+		for _, reservedKey := range ReservedPasteKeys {
+			if strings.HasPrefix(key, reservedKey) {
+				isReserved = true
+				break
+			}
+		}
+		if !alreadyInUse && !isReserved {
+			break
+		}
+		epoch++
+	}
+	return key, nil
+}
+
+// generatePasteKeyInner generates a new paste key, but leaves the
+// uniqueness and is-reserved checks to the caller. That is, it only
+// generates a random key in the correct (syntactical) format.
+// Both epoch and entropy can be used to set the key length. Epoch is used
+// to prevent collisions in retrying to generate new keys. Entropy (in bits)
+// is used to ensure that a new key has at least some amount of guessing
+// entropy.
+func generatePasteKeyInner(epoch, entropy int) (string, error) {
+	entropyEpoch := entropy
+	entropyEpoch -= minKeyLen * 6         // First 4 characters provide 24 bits.
+	entropyEpoch++                        // One bit less because of '0' bit.
+	entropyEpoch = (entropyEpoch-1)/5 + 1 // 5 bits for every added epoch.
+	if epoch < entropyEpoch {
+		epoch = entropyEpoch
+	}
+	urlKey := make([]byte, minKeyLen+epoch)
+	_, err := rand.Read(urlKey)
+	if err != nil {
+		return "", err
+	}
+	// Put all the values in the range 0..64 for easier base64-encoding
+	for i := 0; i < len(urlKey); i++ {
+		urlKey[i] &= 0x3F
+	}
+	// Implement truncate-resistance by forcing the prefix to
+	//     0b111110xxxxxxxxxx
+	//       ^----- {epoch} ones followed by a single 0
+	//
+	// Example when epoch is 1: prefix is 0b10.
+	i := 0
+	for i < epoch {
+		// Set this bit to 1
+		limb := i / 6
+		bit := i % 6
+		urlKey[limb] |= 1 << uint(5-bit)
+		i++
+	}
+	// Finally set the next bit to 0
+	limb := i / 6
+	bit := i % 6
+	urlKey[limb] &= ^(1 << uint(5-bit))
+
+	// Convert this ID to a canonical base64 notation
+	for i := range urlKey {
+		urlKey[i] = base64Alphabet[urlKey[i]]
+	}
+	return string(urlKey), nil
+}
+
+// GenerateDeleteToken generates a new (random) delete token.
+func GenerateDeleteToken() (string, error) {
+	var deleteToken [16]byte
+	_, err := rand.Read(deleteToken[:])
+	if err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(deleteToken[:]), nil
+}

internal/db/paste_test.go

@@ -0,0 +1,100 @@
+package db
+
+import (
+	"testing"
+	"testing/quick"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+func OpenTemporaryDB() (*Database, error) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gormConfig)
+	if err != nil {
+		return nil, err
+	}
+	migrate := Gormigrate(db)
+	if err := migrate.Migrate(); err != nil {
+		return nil, err
+	}
+	return db, nil
+}
+
+func TestValidatePasteKey(t *testing.T) {
+	tests := []struct {
+		key     string
+		wantErr bool
+		errKind error
+	}{
+		{"xd42__", false, nil},
+		{"xd42_*", true, ErrKeyInvalidChar},
+		{"xd42_/", true, ErrKeyInvalidChar},
+		{"xd42_=", true, ErrKeyInvalidChar},
+		{"xd42_", true, ErrKeyInvalidLength},
+		{"xd42", true, ErrKeyInvalidLength},
+		{"xd4", true, ErrKeyInvalidLength},
+		{"xd", true, ErrKeyInvalidLength},
+		{"x", true, ErrKeyInvalidLength},
+		{"", true, ErrKeyInvalidLength},
+
+		{"KoJ5", false, nil},
+
+		{"__dGSJIIbBpr-SD0", false, nil},
+		{"__dGSJIIbBpr-SD", true, ErrKeyInvalidLength},
+	}
+	for _, tt := range tests {
+		t.Run(tt.key, func(t *testing.T) {
+			err := ValidatePasteKey(tt.key)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ValidatePasteKey() got error = %v, want error %v", err != nil, tt.wantErr)
+			}
+			if (err != nil) && err != tt.errKind {
+				t.Errorf("ValidatePasteKey() error = %v, want errKind %v", err, tt.errKind)
+			}
+		})
+	}
+}
+
+func TestGeneratedKeysAreValid(t *testing.T) {
+	db, err := OpenTemporaryDB()
+	if err != nil {
+		t.Error(err)
+	}
+	var minimumEntropy int
+	checkGeneratedKeyValid := func() bool {
+		key, err := GeneratePasteKey(db, minimumEntropy)
+		if err != nil {
+			return false
+		}
+		return ValidatePasteKey(key) == nil
+	}
+
+	for minimumEntropy = 0; minimumEntropy <= 80; minimumEntropy++ {
+		if err = quick.Check(checkGeneratedKeyValid, nil); err != nil {
+			t.Error(err)
+		}
+	}
+}
+
+func TestTruncatedKeysAreInvalid(t *testing.T) {
+	db, err := OpenTemporaryDB()
+	if err != nil {
+		t.Error(err)
+	}
+	var minimumEntropy int
+	checkTruncatedKeysInvalid := func(truncRand uint) bool {
+		key, err := GeneratePasteKey(db, minimumEntropy)
+		if err != nil {
+			return false
+		}
+		trunc := int(truncRand % uint(len(key)-1))
+		key = key[:trunc]
+		return ValidatePasteKey(key) == ErrKeyInvalidLength
+	}
+
+	for minimumEntropy = 0; minimumEntropy <= 80; minimumEntropy++ {
+		if err = quick.Check(checkTruncatedKeysInvalid, nil); err != nil {
+			t.Error(err)
+		}
+	}
+}

metrics.go

@@ -0,0 +1,108 @@
+package rushlink
+
+import (
+	"log"
+	"net/http"
+	"time"
+
+	"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
+	"github.com/gorilla/mux"
+	"github.com/pkg/errors"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const metricNamespace = "rushlink"
+
+// metricURLsTotalGauge counts the number of requests that are handled by
+// the application, partitioned by status code and HTTP method.
+//
+// This counter is updated by the router.
+var metricRequestsTotalCounter = prometheus.NewCounterVec(
+	prometheus.CounterOpts{
+		Namespace: metricNamespace,
+		Subsystem: "http",
+		Name:      "requests_total",
+		Help:      "How many HTTP requests processed, partitioned by status code and HTTP method.",
+	}, []string{"code", "method"})
+
+// metricRequestsLatencyNanoSeconds keeps track of the request latencies for
+// each http request.
+//
+// This historogram is updated by the router.
+var metricRequestsLatencyNanoSeconds = prometheus.NewHistogramVec(
+	prometheus.HistogramOpts{
+		Namespace: metricNamespace,
+		Subsystem: "http",
+		Name:      "request_duration_seconds",
+		Buckets: []float64{
+			float64(500e-6),
+			float64(1e-3),
+			float64(2e-3),
+			float64(5e-3),
+			float64(10e-3),
+			float64(20e-3),
+			float64(50e-3),
+		},
+		Help: "The latency of each HTTP request, partitioned by status code and HTTP method.",
+	}, []string{"code", "method"})
+
+// metricURLsTotalGauge measures the amount of pastes stored in the database,
+// partitioned by type and state.
+//
+// Its values are computed on the fly by updateMetrics().
+var metricURLsTotalGauge = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Namespace: metricNamespace,
+		Subsystem: "pastes",
+		Name:      "urls_total",
+		Help:      "The current amount of pastes in the database, partitioned by state and type.",
+	}, []string{"state", "type"})
+
+// StartMetricsServer starts sering Prometheus metrics exports on addr
+func StartMetricsServer(addr string, database *db.Database, fs *db.FileStore) {
+	prometheus.MustRegister(metricRequestsTotalCounter)
+	prometheus.MustRegister(metricRequestsLatencyNanoSeconds)
+	prometheus.MustRegister(metricURLsTotalGauge)
+
+	router := mux.NewRouter()
+	router.Handle("/metrics", &MetricsHandler{database}).Methods("GET")
+	srv := &http.Server{
+		Handler:      router,
+		Addr:         addr,
+		WriteTimeout: 15 * time.Second,
+		ReadTimeout:  15 * time.Second,
+	}
+	log.Fatal(srv.ListenAndServe())
+}
+
+type MetricsHandler struct {
+	db *db.Database
+}
+
+func (mh *MetricsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	mh.updateMetrics()
+	promhttp.Handler().ServeHTTP(w, r)
+}
+
+func (mh *MetricsHandler) updateMetrics() {
+	// Update metricURLsTotalGauge
+	results := make([](struct {
+		Type  db.PasteType
+		State db.PasteState
+		Count float64
+	}), 0)
+	query := mh.db.Unscoped().Model(&db.Paste{}).Select("type", "state", "COUNT(*) as count").Group("type, state").Find(&results)
+	if err := query.Error; err != nil {
+		log.Printf("error: %v", errors.Wrap(err, "fetching pastes_total metric"))
+		return
+	}
+	metricURLsTotalGauge.Reset()
+	for _, r := range results {
+		labels := map[string]string{
+			"type":  r.Type.String(),
+			"state": r.State.String(),
+		}
+		metricURLsTotalGauge.With(labels).Set(r.Count)
+	}
+}

metrics/metrics.go

@@ -1,55 +0,0 @@
-package metrics
-
-import (
-	"log"
-	"net/http"
-	"time"
-
-	"github.com/gorilla/mux"
-	"github.com/pkg/errors"
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-	bolt "go.etcd.io/bbolt"
-
-	"gitea.hashru.nl/dsprenkels/rushlink/db"
-)
-
-const (
-	METRICS_ADDR = "127.0.0.1:58614"
-)
-
-func StartMetricsServer() {
-	var (
-		_ = promauto.NewGaugeFunc(prometheus.GaugeOpts{
-			Namespace: "rushlink",
-			Subsystem: "pastes",
-			Name:      "urls_total",
-			Help:      "The current amount of pastes in the database.",
-		}, func() float64 {
-			var metric float64
-			if err := db.DB.View(func(tx *bolt.Tx) error {
-				bucket := tx.Bucket([]byte("pastes"))
-				if bucket == nil {
-					return errors.New("bucket 'pastes' could not be found")
-				}
-				metric = float64(bucket.Stats().KeyN)
-				return nil
-			}); err != nil {
-				log.Printf("error: %v", errors.Wrap(err, "fetching pastes_total metric"))
-				return 0
-			}
-			return metric
-		})
-	)
-
-	router := mux.NewRouter()
-	router.Handle("/metrics", promhttp.Handler()).Methods("GET")
-	srv := &http.Server{
-		Handler:      router,
-		Addr:         METRICS_ADDR,
-		WriteTimeout: 15 * time.Second,
-		ReadTimeout:  15 * time.Second,
-	}
-	log.Fatal(srv.ListenAndServe())
-}

pkg/gobmarsh/marshal.go

@@ -1,4 +1,4 @@
-package gobmarsh
+package rushlink
 
 // Easier marshalling to and from gob encoding
 
@@ -7,6 +7,7 @@ import (
 	"encoding/gob"
 )
 
+// Marshal serializes the value in v to a byte buffer.
 func Marshal(v interface{}) ([]byte, error) {
 	b := new(bytes.Buffer)
 	err := gob.NewEncoder(b).Encode(v)
@@ -16,6 +17,7 @@ func Marshal(v interface{}) ([]byte, error) {
 	return b.Bytes(), nil
 }
 
+// Unmarshal deserializes the data in data into the object in v.
 func Unmarshal(data []byte, v interface{}) error {
 	b := bytes.NewBuffer(data)
 	return gob.NewDecoder(b).Decode(v)

router.go

@@ -0,0 +1,149 @@
+package rushlink
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"net/url"
+	"runtime/debug"
+	"strconv"
+	"time"
+
+	"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
+	"github.com/gorilla/mux"
+	"github.com/pkg/errors"
+)
+
+const staticFilenameExpr = "[A-Za-z0-9-_.]+"
+const urlKeyExpr = "{key:[A-Za-z0-9-_]{4,}}"
+const urlKeyWithExtExpr = urlKeyExpr + "{ext:\\.[A-Za-z0-9-_]+}"
+
+type rushlink struct {
+	db      *db.Database
+	fs      *db.FileStore
+	rootURL *url.URL
+}
+
+func (rl *rushlink) RootURL() *url.URL {
+	return rl.rootURL
+}
+
+func (rl *rushlink) recoveryMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		logRequestInfo := func() {
+			log.Printf("in request: %v - %v %q %v", r.RemoteAddr, r.Method, r.RequestURI, r.Proto)
+		}
+		defer func() {
+			defer func() {
+				if err := recover(); err != nil {
+					w.WriteHeader(500)
+					log.Printf("error: panic while recovering from another panic: %v\n", err)
+					logRequestInfo()
+					debug.PrintStack()
+					fmt.Fprintf(w, "internal server error: %v\n", err)
+				}
+			}()
+
+			if err := recover(); err != nil {
+				w.WriteHeader(500)
+				log.Printf("error: %v\n", err)
+				logRequestInfo()
+				debug.PrintStack()
+				rl.renderInternalServerError(w, r, err)
+			}
+		}()
+		next.ServeHTTP(w, r)
+	})
+}
+
+func (rl *rushlink) metricsMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		tick := time.Now()
+		srw := statusResponseWriter{Inner: w}
+		next.ServeHTTP(&srw, r)
+		tock := time.Now()
+
+		status := strconv.Itoa(srw.StatusCode)
+		labels := map[string]string{"code": status, "method": r.Method}
+		// Update requests counter metric
+		metricRequestsTotalCounter.With(labels).Inc()
+		// Update request latency metric
+		elapsed := tock.Sub(tick)
+		metricRequestsLatencyNanoSeconds.With(labels).Observe(elapsed.Seconds())
+	})
+}
+
+type statusResponseWriter struct {
+	Inner      http.ResponseWriter
+	StatusCode int
+}
+
+func (w *statusResponseWriter) Header() http.Header {
+	return w.Inner.Header()
+}
+
+func (w *statusResponseWriter) Write(buf []byte) (int, error) {
+	if w.StatusCode == 0 {
+		w.WriteHeader(http.StatusOK)
+	}
+	return w.Inner.Write(buf)
+}
+
+func (w *statusResponseWriter) WriteHeader(statusCode int) {
+	w.StatusCode = statusCode
+	w.Inner.WriteHeader(statusCode)
+}
+
+// InitMainRouter creates the main Gorilla router for the application.
+//
+// This function will not populate the  router with an error-recovery and
+// metrics-reporting middleware. If these middleware are required, then the
+// caller should encapsulate this router inside of another router and register
+// the middlewares on the encapsulating router.
+func InitMainRouter(r *mux.Router, rl *rushlink) {
+	r.HandleFunc("/{path:img/"+staticFilenameExpr+"}", rl.staticGetHandler).Methods("GET", "HEAD")
+	r.HandleFunc("/{path:css/"+staticFilenameExpr+"}", rl.staticGetHandler).Methods("GET", "HEAD")
+	r.HandleFunc("/{path:js/"+staticFilenameExpr+"}", rl.staticGetHandler).Methods("GET", "HEAD")
+	r.HandleFunc("/", rl.indexGetHandler).Methods("GET", "HEAD")
+	r.HandleFunc("/", rl.newPasteHandler).Methods("POST")
+	r.HandleFunc("/"+urlKeyExpr, rl.viewPasteHandler).Methods("GET", "HEAD")
+	r.HandleFunc("/"+urlKeyWithExtExpr, rl.viewPasteHandler).Methods("GET", "HEAD")
+	r.HandleFunc("/"+urlKeyExpr+"/nr", rl.viewPasteHandlerNoRedirect).Methods("GET", "HEAD")
+	r.HandleFunc("/"+urlKeyWithExtExpr+"/nr", rl.viewPasteHandlerNoRedirect).Methods("GET", "HEAD")
+	r.HandleFunc("/"+urlKeyExpr+"/meta", rl.viewPasteHandlerMeta).Methods("GET", "HEAD")
+	r.HandleFunc("/"+urlKeyWithExtExpr+"/meta", rl.viewPasteHandlerMeta).Methods("GET", "HEAD")
+	r.HandleFunc("/"+urlKeyExpr, rl.deletePasteHandler).Methods("DELETE")
+	r.HandleFunc("/"+urlKeyWithExtExpr, rl.deletePasteHandler).Methods("DELETE")
+	r.HandleFunc("/"+urlKeyExpr+"/delete", rl.deletePasteHandler).Methods("POST")
+	r.HandleFunc("/"+urlKeyWithExtExpr+"/delete", rl.deletePasteHandler).Methods("POST")
+}
+
+// StartMainServer starts the main http server listening on addr.
+func StartMainServer(addr string, db *db.Database, fs *db.FileStore, rawRootURL string) {
+	var rootURL *url.URL
+	if rawRootURL != "" {
+		var err error
+		rootURL, err = url.Parse(rawRootURL)
+		if err != nil {
+			log.Fatalln(errors.Wrap(err, "could not parse rootURL flag"))
+		}
+	}
+	rl := rushlink{
+		db:      db,
+		fs:      fs,
+		rootURL: rootURL,
+	}
+
+	router := mux.NewRouter()
+	router.Use(rl.metricsMiddleware)
+	router.Use(rl.recoveryMiddleware)
+	InitMainRouter(router, &rl)
+
+	srv := &http.Server{
+		Handler:      router,
+		Addr:         addr,
+		WriteTimeout: 15 * time.Second,
+		ReadTimeout:  15 * time.Second,
+	}
+	log.Fatal(srv.ListenAndServe())
+}

views.go

@@ -1,8 +1,6 @@
-package handlers
+package rushlink
 
-//go:generate go get github.com/go-bindata/go-bindata
-//go:generate go get -u github.com/go-bindata/go-bindata/...
-//go:generate go-bindata -pkg $GOPACKAGE -prefix ../assets ../assets/...
+//go:generate go-bindata -pkg $GOPACKAGE -prefix assets/ assets/...
 
 import (
 	"bytes"
@@ -18,21 +16,24 @@ import (
 	"strconv"
 	"strings"
 	text "text/template"
+	"time"
 
 	"github.com/pkg/errors"
 )
 
+const defaultScheme = "http"
+
 // Plain text templates
 var textBaseTemplate *text.Template = text.Must(text.New("").Parse(string(MustAsset("templates/txt/base.txt.tmpl"))))
 var htmlBaseTemplate *html.Template = html.Must(html.New("").Parse(string(MustAsset("templates/html/base.html.tmpl"))))
 
 // Template collections
-var textTemplates = make(map[string]*text.Template, 0)
-var htmlTemplates = make(map[string]*html.Template, 0)
+var textTemplates = make(map[string]*text.Template)
+var htmlTemplates = make(map[string]*html.Template)
 
 // Used by resolveResponseContentType
 var acceptHeaderMediaRangeRegex = regexp.MustCompile(`^\s*([^()<>@,;:\\"/\[\]?.=]+)/([^()<>@,;:\\"/\[\]?.=]+)\s*$`)
-var acceptHeaderAcceptParamsRegex = regexp.MustCompile(`^\s*(\w+)=([A-Za-z0-9.-])\s*$`)
+var acceptHeaderAcceptParamsRegex = regexp.MustCompile(`^\s*(\w+)=([A-Za-z0-9.-]+)\s*$`)
 var acceptHeaderWeight = regexp.MustCompile(`^\s*q=0(?:\.([0-9]{0,3}))|1(?:\.0{0,3})\s*$`)
 
 // HTML templates
@@ -74,19 +75,37 @@ func mustMatch(pattern, name string) bool {
 	return m
 }
 
-func parseFail(tmplName string, err error) {
-	panic(errors.Wrapf(err, "parsing of %v failed", tmplName))
+func mapExtend(m map[string]interface{}, key string, value interface{}) {
+	if m[key] != nil {
+		return
+	}
+	m[key] = value
 }
 
-func render(w http.ResponseWriter, r *http.Request, tmplName string, data map[string]interface{}) {
+func (rl *rushlink) renderStatic(w http.ResponseWriter, r *http.Request, path string) {
+	var modTime time.Time
+	if info, err := AssetInfo(path); err == nil {
+		modTime = info.ModTime()
+	}
+	contents, err := Asset(path)
+	if err != nil {
+		rl.renderError(w, r, http.StatusNotFound, err.Error())
+		return
+	}
+	http.ServeContent(w, r, path, modTime, bytes.NewReader(contents))
+}
+
+func (rl *rushlink) render(w http.ResponseWriter, r *http.Request, status int, tmplName string, data map[string]interface{}) {
 	contentType, err := resolveResponseContentType(r, []string{"text/plain", "text/html"})
 	if err != nil {
 		w.WriteHeader(http.StatusNotAcceptable)
 		fmt.Fprintf(w, "error parsing Accept header: %v\n", err)
+		return
 	}
 
 	// Add the request to the template data
-	data["Request"] = r
+	mapExtend(data, "RootURL", rl.resolveRootURL(r))
+	mapExtend(data, "Request", r)
 
 	switch contentType {
 	case "text/plain":
@@ -96,7 +115,12 @@ func render(w http.ResponseWriter, r *http.Request, tmplName string, data map[st
 			err = fmt.Errorf("'%v' not in textTemplates", tmplName)
 			break
 		}
-		err = tmpl.Execute(w, data)
+		if status != 0 {
+			w.WriteHeader(status)
+		}
+		if r.Method != "HEAD" {
+			err = tmpl.Execute(w, data)
+		}
 	case "text/html":
 		w.Header().Set("Content-Type", "text/html")
 		tmpl := htmlTemplates[tmplName]
@@ -117,7 +141,12 @@ func render(w http.ResponseWriter, r *http.Request, tmplName string, data map[st
 			}
 			return buf.String()
 		}
-		err = tmpl.Execute(w, data)
+		if status != 0 {
+			w.WriteHeader(status)
+		}
+		if r.Method != "HEAD" {
+			err = tmpl.Execute(w, data)
+		}
 	default:
 		// Fall back to plain text without template
 		w.WriteHeader(http.StatusNotAcceptable)
@@ -129,14 +158,44 @@ func render(w http.ResponseWriter, r *http.Request, tmplName string, data map[st
 	}
 }
 
-func renderError(w http.ResponseWriter, r *http.Request, status int, msg string) {
-	w.WriteHeader(status)
-	render(w, r, "error", map[string]interface{}{"Message": msg})
+func (rl *rushlink) renderError(w http.ResponseWriter, r *http.Request, status int, msg string) {
+	rl.render(w, r, status, "error", map[string]interface{}{"Message": msg})
 }
 
-func renderInternalServerError(w http.ResponseWriter, r *http.Request, err interface{}) {
+func (rl *rushlink) renderInternalServerError(w http.ResponseWriter, r *http.Request, err interface{}) {
 	msg := fmt.Sprintf("internal server error: %v", err)
-	renderError(w, r, http.StatusInternalServerError, msg)
+	rl.renderError(w, r, http.StatusInternalServerError, msg)
+}
+
+// resolveRootURL constructs the `scheme://host` part of rushlinks public API.
+//
+// If the `--root_url` flag is set, it will return that URL.
+// Otherwise, this function will return 'https://{Host}', where `{Host}` is
+// the value provided by the client in the HTTP `Host` header.  This value may
+// be invalid, but it is impossible to handle this error (because we *cannot*
+// know the real host).
+func (rl *rushlink) resolveRootURL(r *http.Request) string {
+	rlHost := rl.RootURL()
+	if rlHost != nil {
+		// Root URL overridden by command line arguments
+		return rlHost.String()
+	}
+
+	// Guess scheme
+	scheme := defaultScheme
+	forwardedScheme := r.Header.Get("X-Forwarded-Proto")
+	switch forwardedScheme {
+	case "http":
+		scheme = "http"
+	case "https":
+		scheme = "https"
+	}
+	// Guess host
+	host := r.Host
+	if forwardedHost := r.Header.Get("X-Forwarded-Host"); forwardedHost != "" {
+		host = forwardedHost
+	}
+	return scheme + "://" + host
 }
 
 // Try to resolve the preferred content-type for the response to this request.
@@ -154,7 +213,7 @@ func resolveResponseContentType(r *http.Request, types []string) (string, error)
 	if len(types) == 0 {
 		return "", nil
 	}
-	acceptHeader := r.Header.Get("Accept")
+	acceptHeader := strings.TrimSpace(r.Header.Get("Accept"))
 	if acceptHeader == "" {
 		return types[0], nil
 	}
@@ -172,7 +231,7 @@ func resolveResponseContentType(r *http.Request, types []string) (string, error)
 		choiceParts := strings.Split(avString, ";")
 		mediaRange := acceptHeaderMediaRangeRegex.FindStringSubmatch(choiceParts[0])
 		if mediaRange == nil {
-			return "", fmt.Errorf("bad media-range (\"%v\")", choiceParts[0])
+			return "", fmt.Errorf("bad media-range ('%v')", choiceParts[0])
 		}
 		av.Type = mediaRange[1]
 		av.Subtype = mediaRange[2]
@@ -197,7 +256,7 @@ func resolveResponseContentType(r *http.Request, types []string) (string, error)
 			// Check if this parameter is still invalid in any case
 			acceptParams := acceptHeaderAcceptParamsRegex.FindStringSubmatchIndex(choiceParts[0])
 			if acceptParams == nil {
-				return "", fmt.Errorf("bad accept-params (\"%v\")", choiceParts[0])
+				return "", fmt.Errorf("bad accept-params ('%v')", choiceParts[0])
 			}
 		}
 		avs[i] = av

views_test.go

@@ -0,0 +1,54 @@
+package rushlink
+
+import (
+	"net/http"
+	"testing"
+)
+
+func resolveResponseContentTypeSuccess(t *testing.T, expected string, types []string, acceptVal string) {
+	r, err := http.NewRequest("HEAD", "", nil)
+	if err != nil {
+		panic(err)
+	}
+	r.Header.Set("Accept", acceptVal)
+	got, err := resolveResponseContentType(r, types)
+	if err != nil {
+		t.Errorf("error: '%v'\n", err)
+	}
+	if got != expected {
+		t.Errorf("error: '%v' should be '%v'\n", got, expected)
+	}
+}
+
+func resolveResponseContentTypeError(t *testing.T, expected string, types []string, acceptVal string) {
+	r, err := http.NewRequest("HEAD", "", nil)
+	if err != nil {
+		panic(err)
+	}
+	r.Header.Set("Accept", acceptVal)
+	got, err := resolveResponseContentType(r, types)
+	if err == nil {
+		t.Errorf("expected an error, but got a success: '%v'", got)
+	}
+	if got != "" {
+		t.Errorf("error: return value should be empty, not '%v'", got)
+	}
+	if err.Error() != expected {
+		t.Errorf("wrong error value error: got '%v', want '%v'\n", got, expected)
+	}
+}
+
+func TestResolveResponseContentType(t *testing.T) {
+	resolveResponseContentTypeSuccess(t, "", []string{}, "text/html")
+	resolveResponseContentTypeSuccess(t, "text/html", []string{"text/html"}, "")
+	resolveResponseContentTypeSuccess(t, "text/html", []string{"text/txt", "text/html"}, "text/txt;q=0.5,text/html")
+	resolveResponseContentTypeSuccess(t, "text/html", []string{"text/txt", "text/html"}, "text/txt;q=0.5,text/html;q=0.9")
+	resolveResponseContentTypeSuccess(t, "", []string{"text"}, "text/html")
+	resolveResponseContentTypeSuccess(t, "", []string{"text/*"}, "image/*")
+
+	// Issue #17
+	resolveResponseContentTypeSuccess(t, "*/*", []string{"*/*"}, "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3")
+
+	// Issue #66
+	resolveResponseContentTypeError(t, "bad media-range ('*')", []string{"text/plain"}, " *")
+}