nat/pastebin.go

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// Package pastebin is a simple modern and powerful pastebin service
package main
import (
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"crypto/sha1"
"database/sql"
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"encoding/base64"
"encoding/json"
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"encoding/xml"
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"fmt"
"html"
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"html/template"
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"io"
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"io/ioutil"
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"log"
"net/http"
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"time"
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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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const (
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// ADDRESS that pastebin will return links for
ADDRESS = "http://localhost:9900"
// LENGTH of paste id
LENGTH = 6
// PORT that pastebin will listen on
PORT = ":9900"
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// USERNAME for database
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USERNAME = ""
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// PASS database password
PASS = ""
// NAME database name
NAME = ""
// DATABASE connection String
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DATABASE = USERNAME + ":" + PASS + "@/" + NAME + "?charset=utf8"
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)
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// Template pages
var templates = template.Must(template.ParseFiles("assets/paste.html", "assets/index.html", "assets/clone.html"))
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"`
TITLE string `json:"title"`
HASH string `json:"hash"`
URL string `json:"url"`
SIZE int `json:"size"`
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
Body []byte
Raw string
Home string
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) {
if err != nil {
fmt.Println(err)
}
}
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// generateName uses uniuri to generate a random string that isn't in the
// database
func generateName() string {
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// use uniuri to generate random string
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id := uniuri.NewLen(LENGTH)
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db, err := sql.Open("mysql", DATABASE)
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)
if err != sql.ErrNoRows {
for query.Next() {
generateName()
}
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}
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return id
}
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// hash hashes paste into a sha1 hash
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func hash(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))
return sha
}
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// durationFromExpiry takes the expiry in string format and returns the duration
// that the paste will exist for
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func durationFromExpiry(expiry string) time.Duration {
switch expiry {
case "5 minutes":
return time.Minute * 5
case "1 hour":
return time.Hour + 1 // XXX: did you mean '*'?
case "1 day":
return time.Hour * 24
case "1 week":
return time.Hour * 24 * 7
case "1 month":
return time.Hour * 24 * 30
case "1 year":
return time.Hour * 24 * 365
case "forever":
return time.Hour * 24 * (365 * 20)
}
return time.Hour * 24 * (365 * 20)
}
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// save function handles the saving of each paste.
// raw string is the raw paste input
// lang string is the user specified language for syntax highlighting
// title string user customized title
// expiry string duration that the paste will exist for
// Returns Response struct
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func save(raw string, lang string, title string, expiry string) Response {
db, err := sql.Open("mysql", DATABASE)
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 := hash(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 {
for query.Next() {
var id, title, hash, paste, delkey string
err := query.Scan(&id, &title, &hash, &paste, &delkey)
check(err)
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url := ADDRESS + "/p/" + id
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return Response{id, title, hash, url, len(paste), delkey}
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}
}
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id := generateName()
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url := ADDRESS + "/p/" + id
if lang != "" {
url += "/" + lang
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}
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const timeFormat = "2006-01-02 15:04:05"
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(?,?,?,?,?,?)")
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)
check(err)
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return Response{id, title, sha, url, len(dataEscaped), delKey}
}
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// delHandler checks to see if delkey and pasteid exist in the database.
// 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"]
db, err := sql.Open("mysql", DATABASE)
check(err)
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defer db.Close()
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
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func saveHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
output := vars["output"]
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switch r.Method {
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 == "" {
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 {
case "json":
w.Header().Set("Content-Type", "application/json")
err := json.NewEncoder(w).Encode(b)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
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case "xml":
x, err := xml.MarshalIndent(b, "", " ")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/xml")
w.Write(x)
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case "html":
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='"+ADDRESS+"/del/"+b.ID+"/"+b.DELKEY+"'>"+b.DELKEY+"</a></p>")
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case "redirect":
http.Redirect(w, r, b.URL, 301)
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default:
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w.Header().Set("Content-Type", "plain/text")
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io.WriteString(w, b.URL+"\n")
io.WriteString(w, "delete key: "+b.DELKEY+"\n")
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}
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}
}
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// highlight uses user specified input to call pygments library to highlight the
// 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
// 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)
db, err := sql.Open("mysql", DATABASE)
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check(err)
defer db.Close()
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var title, s string
var expiry string
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=?")
check(err)
_, err = stmt.Exec(param1)
check(err)
return "Error invalid paste", ""
}
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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 != "" {
high, err := highlight(s, lang)
check(err)
return high, html.UnescapeString(title)
}
return html.UnescapeString(s), html.UnescapeString(title)
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}
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func pasteHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
paste := vars["pasteId"]
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lang := vars["lang"]
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s, title := getPaste(paste, lang)
// button links
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link := ADDRESS + "/raw/" + paste
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download := ADDRESS + "/download/" + paste
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clone := ADDRESS + "/clone/" + paste
// Page struct
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p := &Page{
Title: title,
Body: []byte(s),
Raw: link,
Home: ADDRESS,
Download: download,
Clone: clone,
}
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if lang == "" {
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err := templates.ExecuteTemplate(w, "paste.html", p)
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if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
} 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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func cloneHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
paste := vars["pasteId"]
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s, title := getPaste(paste, "")
// Page links
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link := ADDRESS + "/raw/" + paste
download := ADDRESS + "/download/" + paste
clone := ADDRESS + "/clone/" + paste
// Clone page struct
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p := &Page{
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Title: title,
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Body: []byte(s),
Raw: link,
Home: ADDRESS,
Download: download,
Clone: clone,
}
err := templates.ExecuteTemplate(w, "clone.html", p)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
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}
func downloadHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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)
w.Header().Set("Content-Type", r.Header.Get("Content-Type"))
io.WriteString(w, s)
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}
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func rawHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
paste := vars["pasteId"]
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s, _ := getPaste(paste, "")
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// simply write string to browser
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io.WriteString(w, s)
}
func rootHandler(w http.ResponseWriter, r *http.Request) {
err := templates.ExecuteTemplate(w, "index.html", &Page{})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
func main() {
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router := mux.NewRouter()
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router.HandleFunc("/p/{pasteId}", pasteHandler)
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router.HandleFunc("/raw/{pasteId}", rawHandler)
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router.HandleFunc("/p/{pasteId}/{lang}", pasteHandler)
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router.HandleFunc("/clone/{pasteId}", cloneHandler)
router.HandleFunc("/download/{pasteId}", downloadHandler)
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router.HandleFunc("/save", saveHandler)
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router.HandleFunc("/save/{output}", saveHandler)
router.HandleFunc("/del/{pasteId}/{delKey}", delHandler)
router.HandleFunc("/", rootHandler)
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err := http.ListenAndServe(PORT, router)
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if err != nil {
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log.Fatal(err)
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}
}