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share.go
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share.go
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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"crypto/sha256"
"database/sql"
"encoding/base64"
"fmt"
"io"
"log"
"net/http"
"os"
_ "github.com/mattn/go-sqlite3"
)
const (
salt = "Zig playground salt\n"
maxSnippetSize = 64 * 1024
)
type Snippet struct {
Body []byte
}
func (s *Snippet) Id() string {
h := sha256.New()
io.WriteString(h, salt)
h.Write(s.Body)
sum := h.Sum(nil)
b := make([]byte, base64.URLEncoding.EncodedLen(len(sum)))
base64.URLEncoding.Encode(b, sum)
// Web sites don’t always linkify a trailing underscore, making it seem like
// the link is broken. If there is an underscore at the end of the substring,
// extend it until there is not.
hashLen := 11
for hashLen <= len(b) && b[hashLen-1] == '_' {
hashLen++
}
return string(b)[:hashLen]
}
func init() {
http.HandleFunc("/share", share)
}
func (d *DB) initDB() (err error) {
d.DB, err = sql.Open("sqlite3", "file:snippets.db")
statement, err := d.Prepare("CREATE TABLE IF NOT EXISTS snippets (key TEXT PRIMARY KEY, value TEXT)")
statement.Exec()
return
}
func (d *DB) put(id string, code []byte) (err error) {
tx, err := d.Begin()
statement, err := tx.Prepare("INSERT INTO snippets (key, value) VALUES (?, ?)")
statement.Exec(id, string(code))
err = tx.Commit()
return
}
func (d *DB) get(id string) (code []byte, err error) {
row, err := d.Prepare("SELECT value FROM snippets WHERE key = ?")
defer row.Close()
var value string
err = row.QueryRow(id).Scan(&value)
return []byte(value), err
}
func share(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "Forbidden", http.StatusForbidden)
return
}
if url := os.Getenv("SHARE_PASSTHRU_URL"); url != "" {
if err := passThru(url, w, r); err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintln(w, "Share server error.")
return
}
return
}
var body bytes.Buffer
_, err := io.Copy(&body, io.LimitReader(r.Body, maxSnippetSize+1))
if err != nil {
//log.Errorf(r.Context(), "reading Body: %v", err)
http.Error(w, "Server Error", http.StatusInternalServerError)
return
}
r.Body.Close()
snip := &Snippet{Body: body.Bytes()}
id := snip.Id()
db.put(id, body.Bytes())
fmt.Fprint(w, id)
}
func passThru(url string, w io.Writer, req *http.Request) error {
defer req.Body.Close()
req.Header.Set("User-Agent", "play.zig")
r, err := http.Post(url+"/share", req.Header.Get("Content-type"), req.Body)
if err != nil {
log.Fatalf("making POST request: %v", err)
return err
}
defer r.Body.Close()
if _, err := io.Copy(w, r.Body); err != nil {
log.Fatalf("copying response Body: %v", err)
return err
}
return nil
}