2019-09-10 17:52:45 +02:00
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package handlers
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2019-08-25 21:33:56 +02:00
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//go:generate go get github.com/go-bindata/go-bindata
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//go:generate go get -u github.com/go-bindata/go-bindata/...
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2019-09-10 17:52:45 +02:00
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//go:generate go-bindata -pkg $GOPACKAGE -prefix ../../assets ../../assets/...
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2019-08-25 21:33:56 +02:00
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import (
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"bytes"
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"crypto/rand"
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2019-09-01 01:41:01 +02:00
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"crypto/subtle"
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"encoding/base64"
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2019-08-25 21:33:56 +02:00
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"fmt"
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"io"
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"log"
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"net/http"
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"net/url"
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2019-09-01 01:41:01 +02:00
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"strings"
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"text/template"
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"time"
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"unicode"
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2019-08-25 21:33:56 +02:00
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2019-08-29 23:40:24 +02:00
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"github.com/gorilla/mux"
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"github.com/pkg/errors"
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2019-08-25 21:33:56 +02:00
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bolt "go.etcd.io/bbolt"
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2019-09-10 17:52:45 +02:00
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"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
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"gitea.hashru.nl/dsprenkels/rushlink/pkg/gobmarsh"
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2019-08-25 21:33:56 +02:00
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)
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2019-08-31 00:02:01 +02:00
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type PasteType int
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type PasteState int
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type StoredPaste struct {
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Type PasteType
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State PasteState
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Content []byte
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Key []byte
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OwnerToken [16]byte
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TimeCreated time.Time
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}
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const (
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TypePaste PasteType = iota
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TypeRedirect
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)
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const (
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StatePresent PasteState = iota
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StateDeleted
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)
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2019-09-01 01:41:01 +02:00
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const CookieOwnerToken = "owner_token"
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2019-09-01 12:04:43 +02:00
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// These keys are designated reserved, and will not be randomly chosen
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var ReservedPasteKeys [][]byte = [][]byte{[]byte("xd42"), []byte("example")}
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2019-09-01 01:41:01 +02:00
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// Base64 encoding and decoding
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var base64Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
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var base64Encoder = base64.NewEncoding(base64Alphabet).WithPadding(base64.NoPadding)
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// Page contents
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var baseTemplate = template.New("empty")
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var indexTemplate = template.Must(baseTemplate.Parse(string(MustAsset("text/index.txt"))))
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2019-09-01 01:41:01 +02:00
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func (t PasteType) String() (string, error) {
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switch t {
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case TypePaste:
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return "paste", nil
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case TypeRedirect:
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return "redirect", nil
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default:
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return "", fmt.Errorf("invalid PasteType (%v)", t)
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}
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}
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func (t PasteState) String() (string, error) {
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switch t {
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case StatePresent:
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return "present", nil
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case StateDeleted:
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return "deleted", nil
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default:
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return "", fmt.Errorf("invalid PasteState (%v)", t)
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}
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}
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func IndexGetHandler(w http.ResponseWriter, r *http.Request) {
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if err := indexTemplate.Execute(w, nil); err != nil {
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panic(err)
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}
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}
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func IndexPostHandler(w http.ResponseWriter, r *http.Request) {
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if err := r.ParseMultipartForm(50 * 1000 * 1000); err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "Internal server error: %v\n", err)
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2019-08-25 21:33:56 +02:00
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return
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}
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// Determine what kind of post this is, currently only `shorten=...`
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if len(r.PostForm) == 0 {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusBadRequest)
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var buf []byte
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r.Body.Read(buf)
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io.WriteString(w, "empty body in POST request\n")
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2019-08-25 21:33:56 +02:00
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return
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}
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shorten_values, prs := r.PostForm["shorten"]
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if !prs {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusBadRequest)
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io.WriteString(w, "no 'shorten' param supplied\n")
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2019-08-25 21:33:56 +02:00
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return
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}
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if len(shorten_values) != 1 {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusBadRequest)
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io.WriteString(w, "only one 'shorten' param is allowed per request\n")
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2019-08-25 21:33:56 +02:00
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return
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}
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2019-09-10 17:52:45 +02:00
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ShortenPostHandler(w, r)
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2019-08-25 21:33:56 +02:00
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}
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2019-09-10 17:52:45 +02:00
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func PasteGetHandler(w http.ResponseWriter, r *http.Request) {
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pasteGetHandlerInner(w, r, false, false)
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}
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2019-09-10 17:52:45 +02:00
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func PasteGetHandlerNoRedirect(w http.ResponseWriter, r *http.Request) {
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pasteGetHandlerInner(w, r, true, false)
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2019-08-31 00:02:01 +02:00
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}
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2019-09-10 17:52:45 +02:00
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func PasteGetHandlerMeta(w http.ResponseWriter, r *http.Request) {
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pasteGetHandlerInner(w, r, false, true)
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}
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func pasteGetHandlerInner(w http.ResponseWriter, r *http.Request, noRedirect, showMeta bool) {
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vars := mux.Vars(r)
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key := vars["key"]
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2019-08-31 00:02:01 +02:00
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var storedPaste *StoredPaste
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2019-09-10 17:52:45 +02:00
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if err := db.DB.View(func(tx *bolt.Tx) error {
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var err error
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2019-08-31 00:02:01 +02:00
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storedPaste, err = getURL(tx, []byte(key))
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2019-08-29 00:50:26 +02:00
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return err
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}); err != nil {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusInternalServerError)
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2019-08-29 00:50:26 +02:00
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log.Printf("error: %v\n", err)
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fmt.Fprintf(w, "internal server error: %v\n", err)
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2019-08-29 00:50:26 +02:00
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return
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}
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2019-08-31 00:02:01 +02:00
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if storedPaste == nil {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusNotFound)
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fmt.Fprintf(w, "url key not found in the database\n")
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2019-09-01 01:41:01 +02:00
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return
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}
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if showMeta {
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typeString, err := storedPaste.Type.String()
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if err != nil {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusInternalServerError)
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2019-09-01 01:41:01 +02:00
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log.Printf("error: %v\n", err)
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2019-09-05 23:57:43 +02:00
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fmt.Fprintf(w, "internal server error: %v\n", err)
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2019-09-01 01:41:01 +02:00
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return
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}
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stateString, err := storedPaste.State.String()
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if err != nil {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusInternalServerError)
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2019-09-01 01:41:01 +02:00
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log.Printf("error: %v\n", err)
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2019-09-05 23:57:43 +02:00
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fmt.Fprintf(w, "internal server error: %v\n", err)
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2019-09-01 01:41:01 +02:00
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return
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}
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isOwner := "no"
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ownerToken, ok := getOwnerTokenFromRequest(r)
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if ok && subtle.ConstantTimeCompare(ownerToken[:], storedPaste.OwnerToken[:]) == 1 {
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isOwner = "yes"
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}
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w.WriteHeader(http.StatusOK)
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fmt.Fprintf(w, "key: %v\n", string(storedPaste.Key))
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fmt.Fprintf(w, "type: %v\n", typeString)
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fmt.Fprintf(w, "state: %v\n", stateString)
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fmt.Fprintf(w, "created: %v\n", storedPaste.TimeCreated.String())
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fmt.Fprintf(w, "are you the owner: %v\n", isOwner)
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2019-08-31 00:02:01 +02:00
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return
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2019-08-29 00:50:26 +02:00
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}
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2019-09-01 01:41:01 +02:00
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2019-08-31 00:02:01 +02:00
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switch storedPaste.State {
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case StatePresent:
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if !noRedirect {
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rawurl := string(storedPaste.Content)
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urlParse, err := url.Parse(rawurl)
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if err != nil {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusInternalServerError)
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2019-08-31 00:02:01 +02:00
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log.Printf("error: invalid URL ('%v') in database for key '%v': %v\n", rawurl, storedPaste.Key, err)
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2019-09-05 23:57:43 +02:00
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fmt.Fprintf(w, "internal server error: invalid url in database\n")
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2019-08-31 00:02:01 +02:00
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return
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}
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http.Redirect(w, r, urlParse.String(), http.StatusSeeOther)
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}
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w.Write(storedPaste.Content)
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case StateDeleted:
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusGone)
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fmt.Fprintf(w, "key has been deleted\n")
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2019-08-29 00:50:26 +02:00
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default:
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w.WriteHeader(http.StatusInternalServerError)
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2019-08-31 00:02:01 +02:00
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log.Printf("error: invalid storedPaste.State (%v) for key '%v'\n", storedPaste.State, storedPaste.Key)
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2019-09-05 23:57:43 +02:00
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fmt.Fprintf(w, "internal server error: invalid storedPaste.State (%v\n)", storedPaste.State)
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2019-08-29 00:50:26 +02:00
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}
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}
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2019-09-10 17:52:45 +02:00
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func ShortenPostHandler(w http.ResponseWriter, r *http.Request) {
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2019-08-25 21:33:56 +02:00
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rawurl := r.PostForm.Get("shorten")
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userURL, err := url.ParseRequestURI(rawurl)
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if err != nil {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusBadRequest)
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fmt.Fprintf(w, "invalid url (%v): %v\n", err, rawurl)
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2019-08-25 21:33:56 +02:00
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return
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}
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if userURL.Scheme == "" {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusBadRequest)
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fmt.Fprintf(w, "invalid url (unspecified scheme)\n", rawurl)
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2019-08-25 21:33:56 +02:00
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return
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}
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if userURL.Host == "" {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusBadRequest)
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fmt.Fprintf(w, "invalid url (unspecified host)\n", rawurl)
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2019-08-25 21:33:56 +02:00
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return
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}
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2019-08-31 00:02:01 +02:00
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var storedPaste *StoredPaste
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2019-09-10 17:52:45 +02:00
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if err := db.DB.Update(func(tx *bolt.Tx) error {
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2019-09-01 01:41:01 +02:00
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ownerKey, ok := getOwnerTokenFromRequest(r)
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if ok == false {
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// Owner key not supplied or invalid, generate a new one
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ownerKey, err = generateOwnerToken()
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if err != nil {
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return errors.Wrap(err, "generating OwnerToken")
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}
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}
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sp, err := shortenURL(tx, userURL, ownerKey)
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storedPaste = sp
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2019-08-25 21:33:56 +02:00
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return err
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}); err != nil {
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusInternalServerError)
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2019-08-29 00:50:26 +02:00
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log.Printf("error: %v\n", err)
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2019-09-05 23:57:43 +02:00
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fmt.Fprintf(w, "internal server error: %v\n", err)
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2019-08-25 21:33:56 +02:00
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return
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}
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2019-09-01 01:41:01 +02:00
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saveURL, err := r.URL.Parse(string(storedPaste.Key))
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if err != nil {
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2019-09-06 00:07:50 +02:00
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err = errors.Wrap(err, "parsing url")
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log.Printf("error: %v\n", err)
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fmt.Fprintf(w, "internal server error: %v\n", err)
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return
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2019-09-01 01:41:01 +02:00
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}
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var base64OwnerToken = make([]byte, 24)
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base64Encoder.Encode(base64OwnerToken, storedPaste.OwnerToken[:])
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2019-09-05 23:57:43 +02:00
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w.WriteHeader(http.StatusOK)
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fmt.Fprintf(w, "URL saved at %v\n", saveURL)
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2019-09-01 01:41:01 +02:00
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isNotPrint := func(r rune) bool { return !unicode.IsPrint(r) }
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2019-09-05 23:57:43 +02:00
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fmt.Fprintf(w, "Owner key is %s\n", strings.TrimRightFunc(string(base64OwnerToken), isNotPrint))
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2019-08-29 00:50:26 +02:00
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}
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// Retrieve a URL from the database
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2019-08-31 00:02:01 +02:00
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func getURL(tx *bolt.Tx, key []byte) (*StoredPaste, error) {
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2019-09-10 17:52:45 +02:00
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shortenBucket := tx.Bucket([]byte(db.BUCKET_PASTES))
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2019-08-29 00:50:26 +02:00
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if shortenBucket == nil {
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2019-09-10 17:52:45 +02:00
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return nil, fmt.Errorf("bucket %v does not exist", db.BUCKET_PASTES)
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2019-08-29 00:50:26 +02:00
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}
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storedBytes := shortenBucket.Get(key)
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if storedBytes == nil {
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return nil, nil
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}
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2019-08-31 00:02:01 +02:00
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storedPaste := &StoredPaste{}
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err := gobmarsh.Unmarshal(storedBytes, storedPaste)
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return storedPaste, err
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2019-08-25 21:33:56 +02:00
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}
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// Add a new URL to the database
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//
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// Returns the new ID if the url was successfully shortened
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2019-09-01 01:41:01 +02:00
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|
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func shortenURL(tx *bolt.Tx, userURL *url.URL, ownerKey [16]byte) (*StoredPaste, error) {
|
2019-09-10 17:52:45 +02:00
|
|
|
shortenBucket := tx.Bucket([]byte(db.BUCKET_PASTES))
|
2019-08-25 21:33:56 +02:00
|
|
|
if shortenBucket == nil {
|
2019-09-10 17:52:45 +02:00
|
|
|
return nil, fmt.Errorf("bucket %v does not exist", db.BUCKET_PASTES)
|
2019-08-25 21:33:56 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
// 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.
|
|
|
|
epoch := 0
|
|
|
|
var urlKey []byte
|
|
|
|
for {
|
|
|
|
var err error
|
|
|
|
urlKey, err = generateURLKey(epoch)
|
|
|
|
if err != nil {
|
|
|
|
return nil, errors.Wrap(err, "url-key generation failed")
|
|
|
|
}
|
2019-09-01 12:04:43 +02:00
|
|
|
|
2019-08-25 21:33:56 +02:00
|
|
|
found := shortenBucket.Get(urlKey)
|
|
|
|
if found == nil {
|
|
|
|
break
|
|
|
|
}
|
2019-09-01 12:04:43 +02:00
|
|
|
|
|
|
|
isReserved := false
|
|
|
|
for _, reservedKey := range ReservedPasteKeys {
|
|
|
|
if bytes.HasPrefix(urlKey, reservedKey) {
|
|
|
|
isReserved = true
|
|
|
|
break
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if !isReserved {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
|
2019-08-25 21:33:56 +02:00
|
|
|
epoch++
|
|
|
|
}
|
|
|
|
|
|
|
|
// Store the new key
|
2019-08-31 00:02:01 +02:00
|
|
|
storedPaste := StoredPaste{
|
|
|
|
Type: TypeRedirect,
|
|
|
|
State: StatePresent,
|
|
|
|
Content: []byte(userURL.String()),
|
2019-08-29 00:50:26 +02:00
|
|
|
Key: urlKey,
|
2019-09-01 01:41:01 +02:00
|
|
|
OwnerToken: ownerKey,
|
2019-08-25 21:33:56 +02:00
|
|
|
TimeCreated: time.Now().UTC(),
|
|
|
|
}
|
2019-08-31 00:02:01 +02:00
|
|
|
storedBytes, err := gobmarsh.Marshal(storedPaste)
|
2019-08-25 21:33:56 +02:00
|
|
|
if err != nil {
|
|
|
|
return nil, errors.Wrap(err, "encoding for database failed")
|
|
|
|
}
|
|
|
|
if err := shortenBucket.Put(urlKey, storedBytes); err != nil {
|
|
|
|
return nil, errors.Wrap(err, "database transaction failed")
|
|
|
|
}
|
2019-08-31 00:02:01 +02:00
|
|
|
return &storedPaste, nil
|
2019-08-25 21:33:56 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
func generateURLKey(epoch int) ([]byte, error) {
|
|
|
|
urlKey := make([]byte, 4+epoch)
|
|
|
|
_, err := rand.Read(urlKey)
|
|
|
|
if err != nil {
|
|
|
|
return nil, 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
|
2019-08-29 00:50:26 +02:00
|
|
|
for i := range urlKey {
|
|
|
|
urlKey[i] = base64Alphabet[urlKey[i]]
|
|
|
|
}
|
2019-08-25 21:33:56 +02:00
|
|
|
return urlKey, nil
|
|
|
|
}
|
2019-09-01 01:41:01 +02:00
|
|
|
|
|
|
|
func generateOwnerToken() ([16]byte, error) {
|
|
|
|
var ownerKey [16]byte
|
|
|
|
_, err := rand.Read(ownerKey[:])
|
|
|
|
if err != nil {
|
|
|
|
return ownerKey, err
|
|
|
|
}
|
|
|
|
return ownerKey, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func getOwnerTokenFromRequest(r *http.Request) ([16]byte, bool) {
|
|
|
|
var ownerKey [16]byte
|
|
|
|
ownerKeyCookie, err := r.Cookie(CookieOwnerToken)
|
|
|
|
if err != nil && err != http.ErrNoCookie {
|
|
|
|
return ownerKey, false
|
|
|
|
}
|
|
|
|
if ownerKeyCookie != nil {
|
|
|
|
n, err := base64Encoder.Strict().Decode(ownerKey[:], []byte(ownerKeyCookie.Value))
|
|
|
|
if err == nil || n == 16 {
|
|
|
|
return ownerKey, true
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return ownerKey, false
|
|
|
|
}
|