2 uploader -- simplest form file uploader
3 Copyright (C) 2018-2021 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"
42 "golang.org/x/crypto/blake2b"
43 "golang.org/x/net/netutil"
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 $ b2sum -a blake2b somedata.tar.gpg # to verify 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
73 func notify(tai, filename string, size int64, comment string) {
74 if *NotifyToAddr == "" {
78 w := recfile.NewWriter(&rec)
80 recfile.Field{Name: "TAI64N", Value: tai},
81 recfile.Field{Name: "Size", Value: strconv.FormatInt(size, 10)},
82 recfile.Field{Name: "Filename", Value: filename},
84 w.WriteFieldMultiline("Comment", strings.Split(comment, "\n"))
85 cmd := exec.Command(SendmailCmd, *NotifyToAddr)
86 cmd.Stdin = io.MultiReader(
87 strings.NewReader(fmt.Sprintf(
92 Content-Type: text/plain; charset=utf-8
93 Content-Transfer-Encoding: base64
98 mime.BEncoding.Encode("UTF-8", fmt.Sprintf("%s (%d KiB)", filename, size/1024)),
100 strings.NewReader(base64.StdEncoding.EncodeToString(rec.Bytes())),
105 func upload(w http.ResponseWriter, r *http.Request) {
106 log.Println(r.RemoteAddr, "connected")
107 if r.Method == http.MethodGet {
108 if err := Index.Execute(w, FileFieldName); err != nil {
109 log.Println(r.RemoteAddr, err)
113 mr, err := r.MultipartReader()
115 log.Println(r.RemoteAddr, err)
118 p, err := mr.NextPart()
120 log.Println(r.RemoteAddr, err)
123 if p.FormName() != FileFieldName {
124 log.Println(r.RemoteAddr, "non file form field")
127 h, err := blake2b.New512(nil)
132 ts := new(tai64n.TAI64N)
133 tai64n.FromTime(t, ts)
134 tai := ts.Encode()[1:]
135 fnOrig := p.FileName()
136 fd, err := os.OpenFile(tai+".part", os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0666)
138 log.Println(r.RemoteAddr, tai, fnOrig, err)
141 fdBuf := bufio.NewWriterSize(fd, WriteBufSize)
142 mw := io.MultiWriter(fdBuf, h)
143 n, err := io.Copy(mw, p)
145 log.Println(r.RemoteAddr, tai, fnOrig, err)
150 log.Println(r.RemoteAddr, tai, fnOrig, "empty")
151 os.Remove(tai + ".part")
153 fmt.Fprintf(w, "Empty file")
156 if err = fdBuf.Flush(); err != nil {
157 log.Println(r.RemoteAddr, tai, fnOrig, err)
161 if err = fd.Sync(); err != nil {
162 log.Println(r.RemoteAddr, tai, fnOrig, err)
167 sum := hex.EncodeToString(h.Sum(nil))
168 if err = os.Rename(tai+".part", tai); err != nil {
169 log.Println(r.RemoteAddr, tai, fnOrig, n, sum, err)
173 wr := recfile.NewWriter(&rec)
174 if _, err = wr.WriteFields(
175 recfile.Field{Name: "TAI64N", Value: tai},
176 recfile.Field{Name: "Size", Value: strconv.FormatInt(n, 10)},
177 recfile.Field{Name: "Checksum", Value: sum},
179 log.Println(r.RemoteAddr, tai, fnOrig, n, sum, err)
183 log.Println(r.RemoteAddr, tai, fnOrig, n, sum)
184 p, err = mr.NextPart()
185 if err != nil || p.FormName() != CommentFieldName {
186 go notify(fnOrig, tai, n, "")
189 comment, err := ioutil.ReadAll(p)
190 if err != nil || len(comment) == 0 {
191 go notify(tai, fnOrig, n, "")
194 ioutil.WriteFile(tai+".txt", comment, os.FileMode(0666))
195 go notify(tai, fnOrig, n, string(comment))
199 bind := flag.String("bind", "[::]:8086", "Address to bind to")
200 conns := flag.Int("conns", 2, "Maximal number of connections")
201 NotifyFromAddr = flag.String("notify-from", "uploader@example.com", "Address notifications are sent to")
202 NotifyToAddr = flag.String("notify-to", "", "Address notifications are sent from")
204 log.SetFlags(log.Lshortfile)
205 log.SetOutput(os.Stdout)
206 if len(*NotifyFromAddr) == 0 && len(*NotifyToAddr) > 0 {
207 log.Fatalln("notify-from address can not be empty, if notify-to is set")
209 ln, err := net.Listen("tcp", *bind)
213 log.Println("listening", *bind)
214 ln = netutil.LimitListener(ln, *conns)
216 ReadHeaderTimeout: 10 * time.Second,
217 MaxHeaderBytes: 10 * (1 << 10),
219 http.HandleFunc("/upload/", upload)