2 meta4a -- Metalink 4.0 creator
3 Copyright (C) 2021-2023 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/>.
18 // Metalink 4.0 creator
35 "go.cypherpunks.ru/gogost/v5/gost34112012256"
36 "go.cypherpunks.ru/gogost/v5/gost34112012512"
37 "go.stargrave.org/meta4ra"
40 type MultiHasher struct {
43 streebog256h hash.Hash
44 streebog512h hash.Hash
48 func NewMultiHasher() *MultiHasher {
50 sha256h: sha256.New(),
51 sha512h: sha512.New(),
52 streebog256h: gost34112012256.New(),
53 streebog512h: gost34112012512.New(),
57 func (h *MultiHasher) Write(p []byte) (n int, err error) {
60 if _, err := h.sha256h.Write(p); err != nil {
66 if _, err := h.sha512h.Write(p); err != nil {
72 if _, err := h.streebog256h.Write(p); err != nil {
78 if _, err := h.streebog512h.Write(p); err != nil {
88 fn := flag.String("fn", "", "Filename")
89 mtime := flag.String("mtime", "", "Take that file's mtime as a Published date")
90 desc := flag.String("desc", "", "Description")
91 sig := flag.String("sig", "", "Path to signature file")
92 torrent := flag.String("torrent", "", "Torrent URL")
93 log.SetFlags(log.Lshortfile)
96 log.Fatalln("empty -fn")
98 urls := make([]meta4ra.URL, 0, len(flag.Args()))
99 for _, u := range flag.Args() {
100 urls = append(urls, meta4ra.URL{URL: u})
102 br := bufio.NewReaderSize(os.Stdin, 1<<20)
103 buf := make([]byte, 1<<20)
104 h := NewMultiHasher()
105 size, err := io.CopyBuffer(h, br, buf)
114 Hashes: []meta4ra.Hash{
115 {Type: meta4ra.HashSHA256, Hash: hex.EncodeToString(h.sha256h.Sum(nil))},
116 {Type: meta4ra.HashSHA512, Hash: hex.EncodeToString(h.sha512h.Sum(nil))},
117 {Type: meta4ra.HashStreebog256, Hash: hex.EncodeToString(h.streebog256h.Sum(nil))},
118 {Type: meta4ra.HashStreebog512, Hash: hex.EncodeToString(h.streebog512h.Sum(nil))},
122 sigData, err := os.ReadFile(*sig)
126 f.Signature = &meta4ra.Signature{
127 MediaType: meta4ra.GPGSigMediaType,
128 Signature: "\n" + string(sigData),
132 f.MetaURLs = []meta4ra.MetaURL{{MediaType: "torrent", URL: *torrent}}
134 var published time.Time
136 published = time.Now()
138 fi, err := os.Stat(*mtime)
142 published = fi.ModTime()
144 published = published.UTC().Truncate(time.Second)
145 m := meta4ra.Metalink{
146 Files: []meta4ra.File{f},
147 Generator: meta4ra.Generator,
148 Published: published,
150 out, err := xml.MarshalIndent(&m, "", " ")
154 os.Stdout.Write([]byte(xml.Header))
156 os.Stdout.Write([]byte("\n"))