electricdusk/rushlink
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Create a rendering stub

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This commit is contained in:
Daan Sprenkels 2019-09-15 19:51:54 +02:00
parent b7a4b1fee8
commit ddd674e88a
6 changed files with 226 additions and 12 deletions
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10
assets/templates/base.html.tmpl Normal file
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@ -0,0 +1,10 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{{block "title" .}}{{end}}</title>{{block "head-append" .}}{{end}}
</head>
<body>
{{block "body" .}}{{end}}
</body>
</html>

0
assets/templates/base.txt.tmpl Normal file
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14
assets/templates/index.html.tmpl Normal file
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@ -0,0 +1,14 @@
{{define "body"}}
<pre>
#RU URL SHORTENER
=================
Based on https://0x0.st/, this site allows you to easily shorten URLs using
the command line.
## USAGE
# Shorten a URL
curl -F'shorten=http://example.com/some/long/url' <a href="https://hashru.link">https://hashru.link</a>
</pre>
{{end}}

0
assets/text/index.txt → assets/templates/index.txt.tmpl
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13
handlers/handlers.go
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@ -1,9 +1,5 @@
package handlers package handlers
//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/...
import ( import (
"bytes" "bytes"
"crypto/rand" "crypto/rand"
@ -15,7 +11,6 @@ import (
"net/http" "net/http"
"net/url" "net/url"
"strings" "strings"
"text/template"
"time" "time"
"unicode" "unicode"
@ -58,10 +53,6 @@ var ReservedPasteKeys [][]byte = [][]byte{[]byte("xd42"), []byte("example")}
var base64Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_" var base64Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
var base64Encoder = base64.RawURLEncoding.WithPadding(base64.NoPadding) var base64Encoder = base64.RawURLEncoding.WithPadding(base64.NoPadding)
// Page contents
var baseTemplate = template.New("empty")
var indexTemplate = template.Must(baseTemplate.Parse(string(MustAsset("text/index.txt"))))
func (t PasteType) String() (string, error) { func (t PasteType) String() (string, error) {
switch t { switch t {
case TypePaste: case TypePaste:
@ -85,9 +76,7 @@ func (t PasteState) String() (string, error) {
} }
func IndexGetHandler(w http.ResponseWriter, r *http.Request) { func IndexGetHandler(w http.ResponseWriter, r *http.Request) {
if err := indexTemplate.Execute(w, nil); err != nil { Render(w, r, "index", nil)
panic(err)
}
} }
func IndexPostHandler(w http.ResponseWriter, r *http.Request) { func IndexPostHandler(w http.ResponseWriter, r *http.Request) {

201
handlers/views.go Normal file
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@ -0,0 +1,201 @@
package handlers
//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/...
import (
"fmt"
html "html/template"
"io"
"log"
"net/http"
"path/filepath"
"regexp"
"runtime/debug"
"sort"
"strconv"
"strings"
text "text/template"
"github.com/pkg/errors"
)
// Plain text templates
var TextBaseTemplate *text.Template = text.Must(text.New("Empty").Parse(string(MustAsset("templates/base.txt.tmpl"))))
var HTMLBaseTemplate *html.Template = html.Must(html.New("Empty").Parse(string(MustAsset("templates/base.html.tmpl"))))
// Template collections
var TextTemplates = make(map[string]*text.Template, 0)
var HTMLTemplates = make(map[string]*html.Template, 0)
// Used by resolveResponseContentType
var acceptHeaderMediaRangeRegex = regexp.MustCompile(`^\s*([^()<>@,;:\\"/\[\]?.=]+)/([^()<>@,;:\\"/\[\]?.=]+)\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
func init() {
for _, tmplPath := range AssetNames() {
if mustMatch("templates/*.txt.tmpl", tmplPath) {
tmpl := text.Must(TextBaseTemplate.Parse(string(MustAsset(tmplPath))))
tmplName := strings.TrimSuffix(filepath.Base(tmplPath), ".txt.tmpl")
TextTemplates[tmplName] = tmpl
continue
}
if mustMatch("templates/*.html.tmpl", tmplPath) {
tmpl := html.Must(HTMLBaseTemplate.Parse(string(MustAsset(tmplPath))))
tmplName := strings.TrimSuffix(filepath.Base(tmplPath), ".html.tmpl")
HTMLTemplates[tmplName] = tmpl
continue
}
}
}
func mustMatch(pattern, name string) bool {
m, err := filepath.Match(pattern, name)
if err != nil {
panic("%v error in call to mustMatch")
}
return m
}
func parseFail(tmplName string, err error) {
err = errors.Wrapf(err, "parsing of %v failed", tmplName)
panic(err)
}
func Render(w http.ResponseWriter, r *http.Request, tmplName string, data 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)
}
switch contentType {
case "text/plain":
w.Header().Set("Content-Type", "text/plain")
tmpl := TextTemplates[tmplName]
if tmpl == nil {
err = fmt.Errorf("'%v' not in TextTemplates", tmplName)
break
}
err = tmpl.Execute(w, data)
case "text/html":
w.Header().Set("Content-Type", "text/html")
tmpl := HTMLTemplates[tmplName]
if tmpl == nil {
err = fmt.Errorf("'%v' not in HTMLTemplates", tmplName)
break
}
err = tmpl.Execute(w, data)
default:
w.WriteHeader(http.StatusNotAcceptable)
io.WriteString(w, "could not resolve an acceptable content-type\n")
}
if err != nil {
panic(err)
}
}
// Try to resolve the preferred content-type for the response to this request.
//
// This is done by reading from the `types` argument. If one of them matches
// the preferences supplied by the client in their Accept header, we will
// return that one. We will take the clients preferences into account.
//
// Iff no match could be found, this function will return an empty string, and
// the caller should probably respond with a 406 Not Acceptable status code.
// Iff the Accept header was invalid, we will return an error. In this case,
// the situation calls for a 400 Bad Request.
func resolveResponseContentType(r *http.Request, types []string) (string, error) {
// Ref: https://tools.ietf.org/html/rfc7231#section-5.3.2
if len(types) == 0 {
return "", nil
}
acceptHeader := r.Header.Get("Accept")
if acceptHeader == "" {
return types[0], nil
}
type AcceptValue struct {
Type string
Subtype string
Weight int
}
avStrings := strings.Split(acceptHeader, ",")
avs := make([]AcceptValue, len(avStrings))
for i, avString := range avStrings {
av := AcceptValue{Weight: 1000}
choiceParts := strings.Split(avString, ";")
mediaRange := acceptHeaderMediaRangeRegex.FindStringSubmatch(choiceParts[0])
if mediaRange == nil {
return "", fmt.Errorf("bad media-range (\"%v\")", choiceParts[0])
}
av.Type = mediaRange[1]
av.Subtype = mediaRange[2]
// Go through the rest to see if there is a q=... parameter
for choiceParts = choiceParts[1:]; len(choiceParts) > 0; choiceParts = choiceParts[1:] {
// Try to parse the weight param
weight := acceptHeaderWeight.FindStringSubmatch(choiceParts[0])
if weight != nil {
if weight[1] == "" {
av.Weight = 0
} else {
var err error
av.Weight, err = strconv.Atoi((weight[1] + "000")[:3])
if err != nil {
log.Println("error: unreachable statement")
debug.PrintStack()
av.Weight = 1000 // Reset to default value
}
}
break
}
// 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])
}
}
avs[i] = av
}
sort.SliceStable(avs, func(i, j int) bool {
if avs[i].Weight > avs[j].Weight {
return true
}
if avs[i].Type != "*" && avs[j].Type == "*" {
return true
}
if avs[i].Subtype != "*" && avs[j].Subtype == "*" {
return true
}
return false
})
avArgs := make([]AcceptValue, len(types))
for i, fulltype := range types {
split := strings.Split(fulltype, "/")
if len(split) == 1 {
avArgs[i] = AcceptValue{Type: split[0]}
} else {
avArgs[i] = AcceptValue{Type: split[0], Subtype: split[1]}
}
}
for _, av := range avs {
for j, avArg := range avArgs {
if !(av.Type == avArg.Type || av.Type == "*" || avArg.Type == "*") {
continue
}
if !(av.Subtype == avArg.Subtype || av.Subtype == "*" || avArg.Subtype == "*") {
continue
}
return types[j], nil
}
}
return "", nil
}