2 uploader -- simplest form file uploader
3 Copyright (C) 2018-2019 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
39 "golang.org/x/crypto/blake2b"
40 "golang.org/x/net/netutil"
44 WriteBufSize = 1 << 20
45 FileFieldName = "fileupload"
46 CommentFieldName = "comment"
48 SendmailCmd = "/usr/sbin/sendmail"
52 Index = template.Must(template.New("index").Parse(`<html>
53 <head><title>Upload</title></head><body>
54 <form enctype="multipart/form-data" action="/upload/" method="post">
55 <input type="file" name="{{.}}" /><br/>
56 <label for="comment">Optional comment:</label>
57 <textarea name="comment" cols="80" rows="25" name="comment"></textarea><br/>
58 <input type="submit" />
59 </form></body></html>`))
60 NotifyFromAddr *string
64 func notify(filename, timestamp string, size int64, comment string) {
65 if *NotifyToAddr == "" {
68 cmd := exec.Command(SendmailCmd, *NotifyToAddr)
69 cmd.Stdin = io.MultiReader(
70 strings.NewReader(fmt.Sprintf(
75 Content-Type: text/plain; charset=utf-8
76 Content-Transfer-Encoding: base64
81 mime.BEncoding.Encode("UTF-8", fmt.Sprintf(
82 "%s (%d KiB)", filename, size/1024,
85 strings.NewReader(base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf(
86 "Timestamp: %s\nSize: %d bytes\nComment: %s\n",
95 func upload(w http.ResponseWriter, r *http.Request) {
96 log.Println(r.RemoteAddr, "connected")
97 if r.Method == http.MethodGet {
98 if err := Index.Execute(w, FileFieldName); err != nil {
99 log.Println(r.RemoteAddr, err)
103 mr, err := r.MultipartReader()
105 log.Println(r.RemoteAddr, err)
108 p, err := mr.NextPart()
110 log.Println(r.RemoteAddr, err)
113 if p.FormName() != FileFieldName {
114 log.Println(r.RemoteAddr, "non file form field")
117 h, err := blake2b.New512(nil)
121 fn := time.Now().Format(time.RFC3339Nano)
122 fnOrig := p.FileName()
123 fd, err := os.OpenFile(fn+".part", os.O_WRONLY|os.O_CREATE, 0600)
125 log.Println(r.RemoteAddr, fn, fnOrig, err)
128 fdBuf := bufio.NewWriterSize(fd, WriteBufSize)
129 mw := io.MultiWriter(fdBuf, h)
130 n, err := io.Copy(mw, p)
132 log.Println(r.RemoteAddr, fn, fnOrig, err)
137 log.Println(r.RemoteAddr, fn, fnOrig, "empty")
138 os.Remove(fn + ".part")
140 fmt.Fprintf(w, "Empty file")
143 if err = fdBuf.Flush(); err != nil {
144 log.Println(r.RemoteAddr, fn, fnOrig, err)
149 sum := hex.EncodeToString(h.Sum(nil))
150 if err = os.Rename(fn+".part", fn); err != nil {
151 log.Println(r.RemoteAddr, fn, fnOrig, n, sum, err)
154 fmt.Fprintf(w, "Timestamp: %s\nBytes: %d\nBLAKE2b: %s\n", fn, n, sum)
155 log.Println(r.RemoteAddr, fn, fnOrig, n, sum)
156 p, err = mr.NextPart()
157 if err != nil || p.FormName() != CommentFieldName {
158 go notify(fnOrig, fn, n, "")
161 comment, err := ioutil.ReadAll(p)
162 if err != nil || len(comment) == 0 {
163 go notify(fnOrig, fn, n, "")
166 ioutil.WriteFile(fn+".txt", comment, os.FileMode(0600))
167 go notify(fnOrig, fn, n, string(comment))
171 bind := flag.String("bind", "[::]:8086", "Address to bind to")
172 conns := flag.Int("conns", 2, "Maximal number of connections")
173 NotifyFromAddr = flag.String("notify-from", "uploader@example.com", "Address notifications are send to")
174 NotifyToAddr = flag.String("notify-to", "", "Address notifications are send from")
176 if len(*NotifyFromAddr) == 0 && len(*NotifyToAddr) > 0 {
177 log.Fatalln("notify-from address can not be empty, if notify-to is set")
179 ln, err := net.Listen("tcp", *bind)
183 log.Println("listening", *bind)
184 ln = netutil.LimitListener(ln, *conns)
186 ReadHeaderTimeout: 10 * time.Second,
187 MaxHeaderBytes: 10 * (1 << 10),
189 http.HandleFunc("/upload/", upload)