402 lines
10 KiB
Go
402 lines
10 KiB
Go
// Package pastebin is a simple modern and powerful pastebin service
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package main
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import (
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"crypto/sha1"
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"database/sql"
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"encoding/base64"
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"encoding/json"
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"encoding/xml"
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"fmt"
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"html"
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"html/template"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"time"
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duration "github.com/channelmeter/iso8601duration"
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// uniuri is used for easy random string generation
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"github.com/dchest/uniuri"
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// pygments is used for syntax highlighting
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"github.com/ewhal/pygments"
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// mysql driver
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_ "github.com/go-sql-driver/mysql"
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// mux is used for url routing
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"github.com/gorilla/mux"
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)
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type Configuration struct {
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// ADDRESS that pastebin will return links for
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Address string
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// LENGTH of paste id
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Length int
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// PORT that pastebin will listen on
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Port string
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// USERNAME for database
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Username string
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// PASS database password
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Pass string
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// NAME database name
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Name string
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}
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var configuration Configuration
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// DATABASE connection String
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var DATABASE = configuration.Username + ":" + configuration.Pass + "@/" + configuration.Name + "?charset=utf8"
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// Template pages
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var templates = template.Must(template.ParseFiles("assets/paste.html", "assets/index.html", "assets/clone.html"))
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var syntax, _ = ioutil.ReadFile("assets/syntax.html")
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// Response API struct
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type Response struct {
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ID string `json:"id"`
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TITLE string `json:"title"`
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SHA1 string `json:"sha1"`
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URL string `json:"url"`
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SIZE int `json:"size"`
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DELKEY string `json:"delkey"`
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}
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// Page generation struct
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type Page struct {
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Title string
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Body []byte
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Raw string
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Home string
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Download string
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Clone string
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}
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// check error handling function
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func Check(err error) {
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if err != nil {
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log.Println(err)
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}
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}
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// GenerateName uses uniuri to generate a random string that isn't in the
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// database
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func GenerateName() string {
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// use uniuri to generate random string
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id := uniuri.NewLen(configuration.Length)
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db, err := sql.Open("mysql", DATABASE)
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Check(err)
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defer db.Close()
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// query database if id exists and if it does call generateName again
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query, err := db.Query("select id from pastebin where id=?", id)
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if err != sql.ErrNoRows {
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for query.Next() {
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GenerateName()
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}
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}
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return id
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}
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// Sha1 hashes paste into a sha1 hash
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func Sha1(paste string) string {
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hasher := sha1.New()
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hasher.Write([]byte(paste))
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sha := base64.URLEncoding.EncodeToString(hasher.Sum(nil))
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return sha
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}
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// DurationFromExpiry takes the expiry in string format and returns the duration
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// that the paste will exist for
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func DurationFromExpiry(expiry string) time.Duration {
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if expiry == "" {
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expiry = "P20Y"
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}
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dura, err := duration.FromString(expiry) // dura is time.Duration type
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Check(err)
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duration := dura.ToDuration()
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return duration
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}
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// Save function handles the saving of each paste.
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// raw string is the raw paste input
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// lang string is the user specified language for syntax highlighting
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// title string user customized title
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// expiry string duration that the paste will exist for
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// Returns Response struct
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func Save(raw string, lang string, title string, expiry string) Response {
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db, err := sql.Open("mysql", DATABASE)
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Check(err)
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defer db.Close()
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// hash paste data and query database to see if paste exists
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sha := Sha1(raw)
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query, err := db.Query("select id, title, hash, data, delkey from pastebin where hash=?", sha)
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if err != sql.ErrNoRows {
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for query.Next() {
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var id, title, hash, paste, delkey string
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err := query.Scan(&id, &title, &hash, &paste, &delkey)
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Check(err)
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url := configuration.Address + "/p/" + id
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return Response{id, title, hash, url, len(paste), delkey}
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}
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}
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id := GenerateName()
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url := configuration.Address + "/p/" + id
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if lang != "" {
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url += "/" + lang
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}
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const timeFormat = "2006-01-02 15:04:05"
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expiryTime := time.Now().Add(DurationFromExpiry(expiry)).Format(timeFormat)
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delKey := uniuri.NewLen(40)
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dataEscaped := html.EscapeString(raw)
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stmt, err := db.Prepare("INSERT INTO pastebin(id, title, hash, data, delkey, expiry) values(?,?,?,?,?,?)")
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Check(err)
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if title == "" {
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title = id
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}
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_, err = stmt.Exec(id, html.EscapeString(title), sha, dataEscaped, delKey, expiryTime)
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Check(err)
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return Response{id, title, sha, url, len(dataEscaped), delKey}
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}
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// DelHandler checks to see if delkey and pasteid exist in the database.
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// if both exist and are correct the paste will be removed.
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func DelHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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id := vars["pasteId"]
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delkey := vars["delKey"]
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db, err := sql.Open("mysql", DATABASE)
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Check(err)
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defer db.Close()
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stmt, err := db.Prepare("delete from pastebin where delkey=? and id=?")
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Check(err)
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res, err := stmt.Exec(html.EscapeString(delkey), html.EscapeString(id))
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Check(err)
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_, err = res.RowsAffected()
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if err != sql.ErrNoRows {
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io.WriteString(w, id+" deleted")
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}
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}
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// SaveHandler Handles saving pastes and outputing responses
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func SaveHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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output := vars["output"]
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switch r.Method {
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case "POST":
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paste := r.FormValue("p")
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lang := r.FormValue("lang")
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title := r.FormValue("title")
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expiry := r.FormValue("expiry")
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if paste == "" {
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http.Error(w, "Empty paste", 500)
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return
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}
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b := Save(paste, lang, title, expiry)
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switch output {
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case "json":
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w.Header().Set("Content-Type", "application/json")
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err := json.NewEncoder(w).Encode(b)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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case "xml":
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x, err := xml.MarshalIndent(b, "", " ")
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "application/xml")
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w.Write(x)
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case "html":
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w.Header().Set("Content-Type", "text/html")
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io.WriteString(w, "<p><b>URL</b>: <a href='"+b.URL+"'>"+b.URL+"</a></p>")
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io.WriteString(w, "<p><b>Delete Key</b>: <a href='"+configuration.Address+"/del/"+b.ID+"/"+b.DELKEY+"'>"+b.DELKEY+"</a></p>")
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case "redirect":
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http.Redirect(w, r, b.URL, 301)
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default:
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w.Header().Set("Content-Type", "text/plain; charset=UTF-8; imeanit=yes")
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io.WriteString(w, b.URL+"\n")
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io.WriteString(w, "delete key: "+b.DELKEY+"\n")
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}
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}
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}
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// Highlight uses user specified input to call pygments library to highlight the
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// paste
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func Highlight(s string, lang string) (string, error) {
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highlight, err := pygments.Highlight(html.UnescapeString(s), html.EscapeString(lang), "html", "style=autumn,linenos=True, lineanchors=True,anchorlinenos=True,noclasses=True,", "utf-8")
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if err != nil {
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return "", err
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}
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return highlight, nil
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}
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// GetPaste takes pasteid and language
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// queries the database and returns paste data
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func GetPaste(paste string, lang string) (string, string) {
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param1 := html.EscapeString(paste)
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db, err := sql.Open("mysql", DATABASE)
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Check(err)
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defer db.Close()
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var title, s string
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var expiry string
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err = db.QueryRow("select title, data, expiry from pastebin where id=?", param1).Scan(&title, &s, &expiry)
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Check(err)
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if time.Now().Format("2006-01-02 15:04:05") > expiry {
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stmt, err := db.Prepare("delete from pastebin where id=?")
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Check(err)
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_, err = stmt.Exec(param1)
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Check(err)
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return "Error invalid paste", ""
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}
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if err == sql.ErrNoRows {
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return "Error invalid paste", ""
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}
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if lang != "" {
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high, err := Highlight(s, lang)
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Check(err)
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return high, html.UnescapeString(title)
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}
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return html.UnescapeString(s), html.UnescapeString(title)
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}
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// PasteHandler handles the generation of paste pages with the links
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func PasteHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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paste := vars["pasteId"]
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lang := vars["lang"]
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s, title := GetPaste(paste, lang)
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// button links
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link := configuration.Address + "/raw/" + paste
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download := configuration.Address + "/download/" + paste
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clone := configuration.Address + "/clone/" + paste
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// Page struct
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p := &Page{
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Title: title,
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Body: []byte(s),
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Raw: link,
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Home: configuration.Address,
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Download: download,
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Clone: clone,
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}
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if lang == "" {
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err := templates.ExecuteTemplate(w, "paste.html", p)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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} else {
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fmt.Fprintf(w, string(syntax), p.Title, p.Title, s, p.Home, p.Download, p.Raw, p.Clone)
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}
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}
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// CloneHandler handles generating the clone pages
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func CloneHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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paste := vars["pasteId"]
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s, title := GetPaste(paste, "")
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// Page links
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link := configuration.Address + "/raw/" + paste
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download := configuration.Address + "/download/" + paste
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clone := configuration.Address + "/clone/" + paste
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// Clone page struct
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p := &Page{
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Title: title,
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Body: []byte(s),
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Raw: link,
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Home: configuration.Address,
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Download: download,
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Clone: clone,
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}
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err := templates.ExecuteTemplate(w, "clone.html", p)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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// DownloadHandler forces downloads of selected pastes
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func DownloadHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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paste := vars["pasteId"]
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s, _ := GetPaste(paste, "")
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// Set header to an attachment so browser will automatically download it
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w.Header().Set("Content-Disposition", "attachment; filename="+paste)
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w.Header().Set("Content-Type", r.Header.Get("Content-Type"))
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io.WriteString(w, s)
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}
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// RawHandler displays the pastes in text/plain format
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func RawHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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paste := vars["pasteId"]
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s, _ := GetPaste(paste, "")
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w.Header().Set("Content-Type", "text/plain; charset=UTF-8; imeanit=yes")
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// simply write string to browser
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io.WriteString(w, s)
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}
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// RootHandler handles generating the root page
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func RootHandler(w http.ResponseWriter, r *http.Request) {
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err := templates.ExecuteTemplate(w, "index.html", &Page{})
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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func main() {
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router := mux.NewRouter()
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router.HandleFunc("/p/{pasteId}", PasteHandler).Methods("GET")
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router.HandleFunc("/raw/{pasteId}", RawHandler).Methods("GET")
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router.HandleFunc("/p/{pasteId}/{lang}", PasteHandler).Methods("GET")
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router.HandleFunc("/clone/{pasteId}", CloneHandler).Methods("GET")
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router.HandleFunc("/download/{pasteId}", DownloadHandler).Methods("GET")
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router.HandleFunc("/p", SaveHandler).Methods("POST")
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router.HandleFunc("/p/{output}", SaveHandler).Methods("POST")
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router.HandleFunc("/p/{pasteId}/{delKey}", DelHandler).Methods("DELETE")
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router.HandleFunc("/", RootHandler)
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err := http.ListenAndServe(configuration.Port, router)
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if err != nil {
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log.Fatal(err)
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}
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}
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