2016-07-04 02:31:01 +00:00
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// Package pastebin is a simple modern and powerful pastebin service
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2016-07-04 04:17:17 +00:00
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package main
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2016-06-10 13:56:42 +00:00
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import (
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2016-06-19 06:16:08 +00:00
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"crypto/sha1"
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2016-06-19 01:48:57 +00:00
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"database/sql"
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2016-06-19 06:16:08 +00:00
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"encoding/base64"
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"encoding/json"
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2016-06-19 06:17:28 +00:00
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"encoding/xml"
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2016-06-11 03:33:29 +00:00
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"fmt"
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2016-06-19 01:48:57 +00:00
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"html"
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2016-06-23 08:57:00 +00:00
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"html/template"
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2016-06-11 01:22:19 +00:00
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"io"
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2016-06-23 10:41:45 +00:00
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"io/ioutil"
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2016-06-19 04:36:00 +00:00
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"log"
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2016-06-10 13:56:42 +00:00
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"net/http"
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2016-06-24 22:13:36 +00:00
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"time"
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2016-06-19 00:17:35 +00:00
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2016-07-04 00:19:57 +00:00
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// uniuri is used for easy random string generation
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2016-06-19 00:17:35 +00:00
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"github.com/dchest/uniuri"
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2016-07-04 00:19:57 +00:00
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// pygments is used for syntax highlighting
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2016-06-19 00:17:35 +00:00
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"github.com/ewhal/pygments"
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2016-07-04 00:19:57 +00:00
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// mysql driver
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2016-06-19 06:27:54 +00:00
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_ "github.com/go-sql-driver/mysql"
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2016-07-04 00:19:57 +00:00
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// mux is used for url routing
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2016-06-19 06:16:08 +00:00
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"github.com/gorilla/mux"
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2016-06-10 13:56:42 +00:00
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)
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2016-06-11 01:22:19 +00:00
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const (
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2016-07-04 00:19:57 +00:00
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// ADDRESS that pastebin will return links for
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ADDRESS = "http://localhost:9900"
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// LENGTH of paste id
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LENGTH = 6
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// PORT that pastebin will listen on
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PORT = ":9900"
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2016-07-04 02:29:59 +00:00
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// USERNAME for database
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2016-06-23 03:45:00 +00:00
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USERNAME = ""
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2016-07-04 00:19:57 +00:00
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// PASS database password
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PASS = ""
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// NAME database name
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NAME = ""
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// DATABASE connection String
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2016-06-23 03:45:00 +00:00
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DATABASE = USERNAME + ":" + PASS + "@/" + NAME + "?charset=utf8"
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2016-06-11 01:22:19 +00:00
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)
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2016-06-10 14:29:22 +00:00
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2016-07-04 02:52:23 +00:00
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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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2016-07-04 00:19:57 +00:00
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// Response API struct
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2016-06-19 06:16:08 +00:00
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type Response struct {
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2016-06-24 22:16:03 +00:00
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ID string `json:"id"`
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TITLE string `json:"title"`
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HASH string `json:"hash"`
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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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2016-06-19 06:16:08 +00:00
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}
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2016-07-04 00:19:57 +00:00
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// Page generation struct
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2016-06-23 08:57:00 +00:00
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type Page struct {
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2016-06-24 02:17:23 +00:00
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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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2016-06-24 02:59:29 +00:00
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Clone string
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2016-06-23 08:57:00 +00:00
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}
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2016-07-04 00:19:57 +00:00
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// check error handling function
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2016-06-11 03:33:29 +00:00
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func check(err error) {
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if err != nil {
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fmt.Println(err)
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2016-06-10 13:56:42 +00:00
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}
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}
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2016-07-04 00:19:57 +00:00
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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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2016-06-10 14:17:27 +00:00
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func generateName() string {
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2016-07-04 02:52:23 +00:00
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// use uniuri to generate random string
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2016-06-26 11:16:14 +00:00
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id := uniuri.NewLen(LENGTH)
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2016-07-04 02:52:23 +00:00
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2016-06-26 22:09:34 +00:00
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db, err := sql.Open("mysql", DATABASE)
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check(err)
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2016-07-04 00:03:22 +00:00
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defer db.Close()
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2016-07-04 02:52:23 +00:00
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// query database if id exists and if it does call generateName again
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2016-06-26 11:16:14 +00:00
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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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2016-06-19 01:48:57 +00:00
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generateName()
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}
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2016-06-10 14:29:22 +00:00
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}
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2016-06-26 11:16:14 +00:00
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return id
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2016-06-10 14:17:27 +00:00
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}
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2016-07-04 00:19:57 +00:00
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// hash hashes paste into a sha1 hash
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2016-06-23 01:00:33 +00:00
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func hash(paste string) string {
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2016-06-19 06:16:08 +00:00
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hasher := sha1.New()
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2016-06-23 01:00:33 +00:00
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hasher.Write([]byte(paste))
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2016-06-19 06:16:08 +00:00
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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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2016-07-04 00:19:57 +00:00
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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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2016-07-03 23:59:31 +00:00
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func durationFromExpiry(expiry string) time.Duration {
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switch expiry {
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case "5 minutes":
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return time.Minute * 5
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case "1 hour":
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return time.Hour + 1 // XXX: did you mean '*'?
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case "1 day":
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return time.Hour * 24
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case "1 week":
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return time.Hour * 24 * 7
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case "1 month":
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return time.Hour * 24 * 30
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case "1 year":
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return time.Hour * 24 * 365
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case "forever":
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return time.Hour * 24 * (365 * 20)
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}
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return time.Hour * 24 * (365 * 20)
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}
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2016-06-19 06:16:08 +00:00
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2016-07-04 00:19:57 +00:00
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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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2016-07-04 00:02:06 +00:00
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func save(raw string, lang string, title string, expiry string) Response {
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2016-06-26 22:09:34 +00:00
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db, err := sql.Open("mysql", DATABASE)
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check(err)
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2016-07-04 00:03:22 +00:00
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defer db.Close()
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2016-06-19 06:16:08 +00:00
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2016-07-04 02:52:23 +00:00
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// hash paste data and query database to see if paste exists
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2016-06-23 01:00:33 +00:00
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sha := hash(raw)
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2016-06-26 11:14:12 +00:00
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query, err := db.Query("select id, title, hash, data, delkey from pastebin where hash=?", sha)
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2016-07-04 02:52:23 +00:00
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2016-06-26 11:14:12 +00:00
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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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2016-06-19 06:50:56 +00:00
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url := ADDRESS + "/p/" + id
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2016-07-04 00:04:37 +00:00
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return Response{id, title, hash, url, len(paste), delkey}
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2016-06-19 06:44:46 +00:00
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}
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}
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2016-06-19 06:16:08 +00:00
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id := generateName()
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2016-07-04 00:04:37 +00:00
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url := ADDRESS + "/p/" + id
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if lang != "" {
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url += "/" + lang
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2016-06-23 03:19:50 +00:00
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}
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2016-07-04 00:04:37 +00:00
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2016-07-03 23:59:31 +00:00
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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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2016-06-24 22:13:36 +00:00
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2016-06-19 06:16:08 +00:00
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delKey := uniuri.NewLen(40)
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2016-06-27 22:10:20 +00:00
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dataEscaped := html.EscapeString(raw)
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2016-06-19 06:16:08 +00:00
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2016-06-24 22:13:36 +00:00
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stmt, err := db.Prepare("INSERT INTO pastebin(id, title, hash, data, delkey, expiry) values(?,?,?,?,?,?)")
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2016-06-19 01:48:57 +00:00
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check(err)
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2016-06-24 05:24:15 +00:00
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if title == "" {
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2016-07-04 00:38:12 +00:00
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title = id
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2016-06-24 05:24:15 +00:00
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}
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2016-07-04 00:38:12 +00:00
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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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2016-07-04 02:52:23 +00:00
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2016-07-04 00:02:06 +00:00
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return Response{id, title, sha, url, len(dataEscaped), delKey}
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2016-06-10 14:17:27 +00:00
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}
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2016-07-04 00:19:57 +00:00
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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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2016-06-19 06:16:08 +00:00
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func delHandler(w http.ResponseWriter, r *http.Request) {
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2016-06-19 06:59:19 +00:00
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vars := mux.Vars(r)
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2016-06-27 22:10:20 +00:00
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id := vars["pasteId"]
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2016-06-19 06:59:19 +00:00
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delkey := vars["delKey"]
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2016-06-26 22:09:34 +00:00
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db, err := sql.Open("mysql", DATABASE)
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check(err)
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2016-07-04 00:03:22 +00:00
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defer db.Close()
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2016-06-26 22:09:34 +00:00
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2016-06-27 22:07:55 +00:00
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stmt, err := db.Prepare("delete from pastebin where delkey=? and id=?")
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2016-06-19 06:59:19 +00:00
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check(err)
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2016-06-27 22:10:20 +00:00
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res, err := stmt.Exec(html.EscapeString(delkey), html.EscapeString(id))
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2016-06-19 06:59:19 +00:00
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check(err)
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2016-06-23 04:01:29 +00:00
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_, err = res.RowsAffected()
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2016-07-04 02:29:59 +00:00
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if err != sql.ErrNoRows {
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2016-06-27 22:10:20 +00:00
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io.WriteString(w, id+" deleted")
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2016-06-23 04:00:27 +00:00
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}
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2016-06-19 06:16:08 +00:00
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}
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2016-07-04 00:19:57 +00:00
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// saveHandler
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2016-06-19 04:36:00 +00:00
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func saveHandler(w http.ResponseWriter, r *http.Request) {
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2016-06-19 06:16:08 +00:00
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vars := mux.Vars(r)
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output := vars["output"]
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2016-06-10 14:29:22 +00:00
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switch r.Method {
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case "POST":
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2016-06-23 01:00:33 +00:00
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paste := r.FormValue("p")
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2016-06-23 03:19:50 +00:00
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lang := r.FormValue("lang")
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2016-06-24 05:24:15 +00:00
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title := r.FormValue("title")
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2016-06-24 22:13:36 +00:00
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expiry := r.FormValue("expiry")
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2016-06-23 01:00:33 +00:00
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if paste == "" {
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http.Error(w, "Empty paste", 500)
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2016-06-23 04:57:07 +00:00
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return
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2016-06-11 03:33:29 +00:00
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}
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2016-07-04 00:02:06 +00:00
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b := save(paste, lang, title, expiry)
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2016-06-19 06:16:08 +00:00
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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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2016-07-04 04:17:17 +00:00
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2016-06-19 06:17:28 +00:00
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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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2016-06-23 08:57:00 +00:00
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2016-06-23 03:45:00 +00:00
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case "html":
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w.Header().Set("Content-Type", "text/html")
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2016-06-23 03:51:59 +00:00
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io.WriteString(w, "<p><b>URL</b>: <a href='"+b.URL+"'>"+b.URL+"</a></p>")
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2016-06-23 03:55:09 +00:00
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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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2016-06-19 06:16:08 +00:00
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2016-06-23 09:06:24 +00:00
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case "redirect":
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http.Redirect(w, r, b.URL, 301)
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2016-06-19 06:16:08 +00:00
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default:
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2016-07-09 04:44:48 +00:00
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w.Header().Set("Content-Type", "text/plain; charset=UTF-8; imeanit=yes")
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2016-06-19 06:27:54 +00:00
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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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2016-06-19 06:16:08 +00:00
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}
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2016-06-19 04:36:00 +00:00
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}
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}
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2016-07-04 00:19:57 +00:00
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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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2016-06-23 09:21:37 +00:00
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func highlight(s string, lang string) (string, error) {
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2016-06-19 04:36:00 +00:00
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2016-06-23 10:47:45 +00:00
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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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2016-06-22 23:55:08 +00:00
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if err != nil {
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2016-06-23 09:21:37 +00:00
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return "", err
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2016-06-22 23:55:08 +00:00
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}
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2016-06-23 09:21:37 +00:00
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return highlight, nil
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2016-06-19 04:36:00 +00:00
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}
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2016-07-04 02:52:23 +00:00
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// getPaste takes pasteid and language
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// queries the database and returns paste data
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2016-06-24 05:32:20 +00:00
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func getPaste(paste string, lang string) (string, string) {
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2016-06-19 04:36:00 +00:00
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param1 := html.EscapeString(paste)
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2016-06-26 22:09:34 +00:00
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db, err := sql.Open("mysql", DATABASE)
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2016-07-04 00:03:22 +00:00
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check(err)
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defer db.Close()
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2016-06-24 22:33:56 +00:00
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var title, s string
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|
|
var expiry string
|
2016-06-26 22:09:34 +00:00
|
|
|
err = db.QueryRow("select title, data, expiry from pastebin where id=?", param1).Scan(&title, &s, &expiry)
|
2016-06-19 04:36:00 +00:00
|
|
|
check(err)
|
2016-06-24 22:49:34 +00:00
|
|
|
if time.Now().Format("2006-01-02 15:04:05") > expiry {
|
2016-06-24 22:33:56 +00:00
|
|
|
stmt, err := db.Prepare("delete from pastebin where id=?")
|
|
|
|
check(err)
|
|
|
|
_, err = stmt.Exec(param1)
|
|
|
|
check(err)
|
|
|
|
return "Error invalid paste", ""
|
|
|
|
}
|
2016-06-19 04:36:00 +00:00
|
|
|
|
|
|
|
if err == sql.ErrNoRows {
|
2016-06-24 05:33:14 +00:00
|
|
|
return "Error invalid paste", ""
|
2016-06-10 14:29:22 +00:00
|
|
|
}
|
2016-07-04 02:29:59 +00:00
|
|
|
if lang != "" {
|
|
|
|
high, err := highlight(s, lang)
|
|
|
|
check(err)
|
|
|
|
return high, html.UnescapeString(title)
|
|
|
|
}
|
|
|
|
return html.UnescapeString(s), html.UnescapeString(title)
|
2016-06-19 04:36:00 +00:00
|
|
|
}
|
2016-06-23 08:57:00 +00:00
|
|
|
|
2016-06-19 04:36:00 +00:00
|
|
|
func pasteHandler(w http.ResponseWriter, r *http.Request) {
|
2016-06-23 08:57:00 +00:00
|
|
|
vars := mux.Vars(r)
|
|
|
|
paste := vars["pasteId"]
|
2016-06-23 09:21:37 +00:00
|
|
|
lang := vars["lang"]
|
2016-07-04 04:17:17 +00:00
|
|
|
|
2016-06-24 05:32:20 +00:00
|
|
|
s, title := getPaste(paste, lang)
|
2016-07-04 04:17:17 +00:00
|
|
|
|
|
|
|
// button links
|
2016-06-23 09:11:40 +00:00
|
|
|
link := ADDRESS + "/raw/" + paste
|
2016-06-24 02:17:23 +00:00
|
|
|
download := ADDRESS + "/download/" + paste
|
2016-06-24 02:59:29 +00:00
|
|
|
clone := ADDRESS + "/clone/" + paste
|
2016-07-04 04:17:17 +00:00
|
|
|
// Page struct
|
2016-06-25 20:45:54 +00:00
|
|
|
p := &Page{
|
|
|
|
Title: title,
|
|
|
|
Body: []byte(s),
|
|
|
|
Raw: link,
|
|
|
|
Home: ADDRESS,
|
|
|
|
Download: download,
|
|
|
|
Clone: clone,
|
|
|
|
}
|
2016-06-23 10:41:45 +00:00
|
|
|
if lang == "" {
|
2016-06-25 20:45:54 +00:00
|
|
|
|
2016-06-24 01:24:24 +00:00
|
|
|
err := templates.ExecuteTemplate(w, "paste.html", p)
|
2016-06-23 10:41:45 +00:00
|
|
|
if err != nil {
|
|
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
|
|
}
|
|
|
|
|
|
|
|
} else {
|
2016-06-25 20:45:54 +00:00
|
|
|
fmt.Fprintf(w, string(syntax), p.Title, p.Title, s, p.Home, p.Download, p.Raw, p.Clone)
|
2016-06-23 10:41:45 +00:00
|
|
|
|
2016-06-23 08:57:00 +00:00
|
|
|
}
|
2016-06-23 08:40:20 +00:00
|
|
|
}
|
|
|
|
|
2016-06-24 01:04:26 +00:00
|
|
|
func cloneHandler(w http.ResponseWriter, r *http.Request) {
|
2016-06-24 02:59:29 +00:00
|
|
|
vars := mux.Vars(r)
|
|
|
|
paste := vars["pasteId"]
|
2016-07-04 04:17:17 +00:00
|
|
|
|
2016-06-24 05:32:20 +00:00
|
|
|
s, title := getPaste(paste, "")
|
2016-07-04 04:17:17 +00:00
|
|
|
|
|
|
|
// Page links
|
2016-06-24 02:59:29 +00:00
|
|
|
link := ADDRESS + "/raw/" + paste
|
|
|
|
download := ADDRESS + "/download/" + paste
|
|
|
|
clone := ADDRESS + "/clone/" + paste
|
2016-07-04 04:17:17 +00:00
|
|
|
|
|
|
|
// Clone page struct
|
2016-06-24 02:59:29 +00:00
|
|
|
p := &Page{
|
2016-06-24 05:32:20 +00:00
|
|
|
Title: title,
|
2016-06-24 02:59:29 +00:00
|
|
|
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)
|
|
|
|
}
|
|
|
|
|
2016-06-24 01:04:26 +00:00
|
|
|
}
|
|
|
|
func downloadHandler(w http.ResponseWriter, r *http.Request) {
|
2016-06-24 01:46:50 +00:00
|
|
|
vars := mux.Vars(r)
|
|
|
|
paste := vars["pasteId"]
|
2016-06-24 05:32:20 +00:00
|
|
|
s, _ := getPaste(paste, "")
|
2016-07-04 02:52:23 +00:00
|
|
|
|
|
|
|
// Set header to an attachment so browser will automatically download it
|
2016-06-24 02:10:54 +00:00
|
|
|
w.Header().Set("Content-Disposition", "attachment; filename="+paste)
|
|
|
|
w.Header().Set("Content-Type", r.Header.Get("Content-Type"))
|
|
|
|
io.WriteString(w, s)
|
2016-06-24 01:46:50 +00:00
|
|
|
|
2016-06-24 01:04:26 +00:00
|
|
|
}
|
2016-06-23 08:40:20 +00:00
|
|
|
func rawHandler(w http.ResponseWriter, r *http.Request) {
|
2016-06-19 04:36:00 +00:00
|
|
|
vars := mux.Vars(r)
|
|
|
|
paste := vars["pasteId"]
|
2016-06-24 05:32:20 +00:00
|
|
|
s, _ := getPaste(paste, "")
|
2016-07-04 04:17:17 +00:00
|
|
|
|
2016-07-09 04:40:48 +00:00
|
|
|
w.Header().Set("Content-Type", "text/plain; charset=UTF-8; imeanit=yes")
|
2016-07-04 02:52:23 +00:00
|
|
|
// simply write string to browser
|
2016-06-19 04:36:00 +00:00
|
|
|
io.WriteString(w, s)
|
|
|
|
|
2016-06-10 13:56:42 +00:00
|
|
|
}
|
|
|
|
|
2016-07-04 04:17:17 +00:00
|
|
|
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)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-06-10 13:56:42 +00:00
|
|
|
func main() {
|
2016-06-23 01:25:12 +00:00
|
|
|
router := mux.NewRouter()
|
2016-06-19 04:36:00 +00:00
|
|
|
router.HandleFunc("/p/{pasteId}", pasteHandler)
|
2016-06-23 08:40:20 +00:00
|
|
|
router.HandleFunc("/raw/{pasteId}", rawHandler)
|
2016-06-23 09:21:37 +00:00
|
|
|
router.HandleFunc("/p/{pasteId}/{lang}", pasteHandler)
|
2016-06-24 01:46:50 +00:00
|
|
|
router.HandleFunc("/clone/{pasteId}", cloneHandler)
|
|
|
|
router.HandleFunc("/download/{pasteId}", downloadHandler)
|
2016-06-19 04:36:00 +00:00
|
|
|
router.HandleFunc("/save", saveHandler)
|
2016-06-19 06:16:08 +00:00
|
|
|
router.HandleFunc("/save/{output}", saveHandler)
|
|
|
|
router.HandleFunc("/del/{pasteId}/{delKey}", delHandler)
|
2016-07-04 04:17:17 +00:00
|
|
|
router.HandleFunc("/", rootHandler)
|
2016-06-19 04:36:00 +00:00
|
|
|
err := http.ListenAndServe(PORT, router)
|
2016-06-11 03:33:29 +00:00
|
|
|
if err != nil {
|
2016-06-19 04:36:00 +00:00
|
|
|
log.Fatal(err)
|
2016-06-11 03:33:29 +00:00
|
|
|
}
|
2016-06-10 13:56:42 +00:00
|
|
|
|
|
|
|
}
|