2 uploader -- simplest form file uploader
3 Copyright (C) 2018-2023 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, version 3 of the License.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
40 "go.cypherpunks.ru/recfile"
41 "go.cypherpunks.ru/tai64n/v2"
42 "golang.org/x/net/netutil"
43 "lukechampine.com/blake3"
47 WriteBufSize = 1 << 20
48 FileFieldName = "file"
49 CommentFieldName = "comment"
51 SendmailCmd = "/usr/sbin/sendmail"
55 Index = template.Must(template.New("index").Parse(`<html>
56 <head><title>Upload</title></head><body>
57 Example command line usage:
59 $ curl -F file=@somedata.tar.gpg [-F comment="optional comment"] http://.../upload/
60 $ b3sum somedata.tar.gpg # to verify BLAKE3-256 checksum
62 <form enctype="multipart/form-data" action="/upload/" method="post">
63 <label for="file">File to upload:</label><br/>
64 <input name="file" type="file" name="{{.}}" /><br/>
65 <label for="comment">Optional comment:</label></br>
66 <textarea name="comment" cols="80" rows="25" name="comment"></textarea><br/>
67 <input type="submit" />
68 </form></body></html>`))
69 NotifyFromAddr *string
74 func upload(w http.ResponseWriter, r *http.Request) {
75 log.Println(r.RemoteAddr, "connected")
76 if r.Method == http.MethodGet {
77 if err := Index.Execute(w, FileFieldName); err != nil {
78 log.Println(r.RemoteAddr, err)
82 mr, err := r.MultipartReader()
84 log.Println(r.RemoteAddr, err)
87 p, err := mr.NextPart()
89 log.Println(r.RemoteAddr, err)
92 if p.FormName() != FileFieldName {
93 log.Println(r.RemoteAddr, "non file form field")
97 ts := new(tai64n.TAI64N)
99 tai := tai64n.Encode(ts[:])[1:]
100 fnOrig := p.FileName()
101 fd, err := os.OpenFile(tai+".part", os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0666)
103 log.Println(r.RemoteAddr, tai, fnOrig, err)
106 fdBuf := bufio.NewWriterSize(fd, WriteBufSize)
107 h := blake3.New(32, nil)
108 mw := io.MultiWriter(fdBuf, h)
109 n, err := io.Copy(mw, p)
111 log.Println(r.RemoteAddr, tai, fnOrig, err)
116 log.Println(r.RemoteAddr, tai, fnOrig, "empty")
117 os.Remove(tai + ".part")
119 fmt.Fprintf(w, "Empty file")
122 if err = fdBuf.Flush(); err != nil {
123 log.Println(r.RemoteAddr, tai, fnOrig, err)
127 if err = fd.Sync(); err != nil {
128 log.Println(r.RemoteAddr, tai, fnOrig, err)
133 sum := hex.EncodeToString(h.Sum(nil))
134 if err = os.Rename(tai+".part", tai); err != nil {
135 log.Println(r.RemoteAddr, tai, fnOrig, n, sum, err)
140 wr := recfile.NewWriter(&rec)
141 if _, err = wr.WriteFields(
142 recfile.Field{Name: "TAI64N", Value: tai},
143 recfile.Field{Name: "Size", Value: strconv.FormatInt(n, 10)},
144 recfile.Field{Name: "Checksum", Value: sum},
146 log.Println(r.RemoteAddr, tai, fnOrig, n, sum, err)
149 if _, err = w.Write(rec.Bytes()); err == nil {
150 log.Println(r.RemoteAddr, tai, fnOrig, n, sum)
152 log.Println(r.RemoteAddr, tai, fnOrig, n, sum, err)
156 if _, err = wr.WriteFields(
157 recfile.Field{Name: "Filename", Value: fnOrig},
159 log.Println(r.RemoteAddr, tai, fnOrig, n, sum, err)
163 var commentLines []string
164 p, err = mr.NextPart()
165 if err == nil && p.FormName() == CommentFieldName {
166 comment, err := io.ReadAll(p)
167 if err == nil && len(comment) > 0 {
168 commentLines = strings.Split(string(comment), "\n")
169 wr.WriteFieldMultiline("Comment", commentLines)
173 os.WriteFile(tai+".rec", rec.Bytes(), os.FileMode(0666))
174 if *NotifyToAddr == "" {
177 cmd := exec.Command(SendmailCmd, *NotifyToAddr)
178 cmd.Stdin = io.MultiReader(
179 strings.NewReader(fmt.Sprintf(
184 Content-Type: text/plain; charset=utf-8
185 Content-Transfer-Encoding: base64
190 mime.BEncoding.Encode("UTF-8", fmt.Sprintf("%s (%d KiB)", fnOrig, n/1024)),
192 strings.NewReader(base64.StdEncoding.EncodeToString(rec.Bytes())),
202 doUCSPI := flag.Bool("ucspi", false, "Work as UCSPI-TCP service")
203 bind := flag.String("bind", "[::]:8086", "Address to bind to")
204 conns := flag.Int("conns", 2, "Maximal number of connections")
205 NotifyFromAddr = flag.String("notify-from", "uploader@example.com", "Address notifications are sent to")
206 NotifyToAddr = flag.String("notify-to", "", "Address notifications are sent from")
208 log.SetFlags(log.Lshortfile)
210 log.SetOutput(os.Stdout)
212 if len(*NotifyFromAddr) == 0 && len(*NotifyToAddr) > 0 {
213 log.Fatalln("notify-from address can not be empty, if notify-to is set")
216 ReadHeaderTimeout: 10 * time.Second,
217 MaxHeaderBytes: 10 * (1 << 10),
219 http.HandleFunc("/upload/", upload)
221 s.SetKeepAlivesEnabled(false)
223 s.ConnState = connStater
225 if _, ok := err.(UCSPIAlreadyAccepted); !ok {
230 ln, err := net.Listen("tcp", *bind)
234 log.Println("listening", *bind)
235 ln = netutil.LimitListener(ln, *conns)
236 if err = s.Serve(ln); err != nil {