ui-snapshot.c (view raw)
1/* ui-snapshot.c: generate snapshot of a commit
2 *
3 * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
4 *
5 * Licensed under GNU General Public License v2
6 * (see COPYING for full license text)
7 */
8
9#include "cgit.h"
10#include "ui-snapshot.h"
11#include "html.h"
12#include "ui-shared.h"
13
14static int write_archive_type(const char *format, const char *hex, const char *prefix)
15{
16 struct argv_array argv = ARGV_ARRAY_INIT;
17 const char **nargv;
18 int result;
19 argv_array_push(&argv, "snapshot");
20 argv_array_push(&argv, format);
21 if (prefix) {
22 struct strbuf buf = STRBUF_INIT;
23 strbuf_addstr(&buf, prefix);
24 strbuf_addch(&buf, '/');
25 argv_array_push(&argv, "--prefix");
26 argv_array_push(&argv, buf.buf);
27 strbuf_release(&buf);
28 }
29 argv_array_push(&argv, hex);
30 /*
31 * Now we need to copy the pointers to arguments into a new
32 * structure because write_archive will rearrange its arguments
33 * which may result in duplicated/missing entries causing leaks
34 * or double-frees in argv_array_clear.
35 */
36 nargv = xmalloc(sizeof(char *) * (argv.argc + 1));
37 /* argv_array guarantees a trailing NULL entry. */
38 memcpy(nargv, argv.argv, sizeof(char *) * (argv.argc + 1));
39
40 result = write_archive(argv.argc, nargv, NULL, NULL, 0);
41 argv_array_clear(&argv);
42 free(nargv);
43 return result;
44}
45
46static int write_tar_archive(const char *hex, const char *prefix)
47{
48 return write_archive_type("--format=tar", hex, prefix);
49}
50
51static int write_zip_archive(const char *hex, const char *prefix)
52{
53 return write_archive_type("--format=zip", hex, prefix);
54}
55
56static int write_compressed_tar_archive(const char *hex,
57 const char *prefix,
58 char *filter_argv[])
59{
60 int rv;
61 struct cgit_exec_filter f;
62 cgit_exec_filter_init(&f, filter_argv[0], filter_argv);
63
64 cgit_open_filter(&f.base);
65 rv = write_tar_archive(hex, prefix);
66 cgit_close_filter(&f.base);
67 return rv;
68}
69
70static int write_tar_gzip_archive(const char *hex, const char *prefix)
71{
72 char *argv[] = { "gzip", "-n", NULL };
73 return write_compressed_tar_archive(hex, prefix, argv);
74}
75
76static int write_tar_bzip2_archive(const char *hex, const char *prefix)
77{
78 char *argv[] = { "bzip2", NULL };
79 return write_compressed_tar_archive(hex, prefix, argv);
80}
81
82static int write_tar_xz_archive(const char *hex, const char *prefix)
83{
84 char *argv[] = { "xz", NULL };
85 return write_compressed_tar_archive(hex, prefix, argv);
86}
87
88const struct cgit_snapshot_format cgit_snapshot_formats[] = {
89 { ".zip", "application/x-zip", write_zip_archive, 0x01 },
90 { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x02 },
91 { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x04 },
92 { ".tar", "application/x-tar", write_tar_archive, 0x08 },
93 { ".tar.xz", "application/x-xz", write_tar_xz_archive, 0x10 },
94 { NULL }
95};
96
97static struct notes_tree snapshot_sig_notes[ARRAY_SIZE(cgit_snapshot_formats)];
98
99const struct object_id *cgit_snapshot_get_sig(const char *ref,
100 const struct cgit_snapshot_format *f)
101{
102 struct notes_tree *tree;
103 struct object_id oid;
104
105 if (get_oid(ref, &oid))
106 return NULL;
107
108 tree = &snapshot_sig_notes[f - &cgit_snapshot_formats[0]];
109 if (!tree->initialized) {
110 struct strbuf notes_ref = STRBUF_INIT;
111
112 strbuf_addf(¬es_ref, "refs/notes/signatures/%s",
113 f->suffix + 1);
114
115 init_notes(tree, notes_ref.buf, combine_notes_ignore, 0);
116 strbuf_release(¬es_ref);
117 }
118
119 return get_note(tree, &oid);
120}
121
122static const struct cgit_snapshot_format *get_format(const char *filename)
123{
124 const struct cgit_snapshot_format *fmt;
125
126 for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
127 if (ends_with(filename, fmt->suffix))
128 return fmt;
129 }
130 return NULL;
131}
132
133static int make_snapshot(const struct cgit_snapshot_format *format,
134 const char *hex, const char *prefix,
135 const char *filename)
136{
137 struct object_id oid;
138
139 if (get_oid(hex, &oid)) {
140 cgit_print_error_page(404, "Not found",
141 "Bad object id: %s", hex);
142 return 1;
143 }
144 if (!lookup_commit_reference(&oid)) {
145 cgit_print_error_page(400, "Bad request",
146 "Not a commit reference: %s", hex);
147 return 1;
148 }
149 ctx.page.etag = oid_to_hex(&oid);
150 ctx.page.mimetype = xstrdup(format->mimetype);
151 ctx.page.filename = xstrdup(filename);
152 cgit_print_http_headers();
153 format->write_func(hex, prefix);
154 return 0;
155}
156
157static int write_sig(const struct cgit_snapshot_format *format,
158 const char *hex, const char *archive,
159 const char *filename)
160{
161 const struct object_id *note = cgit_snapshot_get_sig(hex, format);
162 enum object_type type;
163 unsigned long size;
164 char *buf;
165
166 if (!note) {
167 cgit_print_error_page(404, "Not found",
168 "No signature for %s", archive);
169 return 0;
170 }
171
172 buf = read_sha1_file(note->hash, &type, &size);
173 if (!buf) {
174 cgit_print_error_page(404, "Not found", "Not found");
175 return 0;
176 }
177
178 html("X-Content-Type-Options: nosniff\n");
179 html("Content-Security-Policy: default-src 'none'\n");
180 ctx.page.etag = oid_to_hex(note);
181 ctx.page.mimetype = xstrdup("application/pgp-signature");
182 ctx.page.filename = xstrdup(filename);
183 cgit_print_http_headers();
184
185 html_raw(buf, size);
186 free(buf);
187 return 0;
188}
189
190/* Try to guess the requested revision from the requested snapshot name.
191 * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
192 * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
193 * Otherwise, if the snapshot name has a prefix matching the result from
194 * repo_basename(), we strip the basename and any following '-' and '_'
195 * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
196 * more. If this still isn't a valid commit object name, we check if pre-
197 * pending a 'v' or a 'V' to the remaining snapshot name ("0.7.2" ->
198 * "v0.7.2") gives us something valid.
199 */
200static const char *get_ref_from_filename(const struct cgit_repo *repo,
201 const char *filename,
202 const struct cgit_snapshot_format *format)
203{
204 const char *reponame;
205 struct object_id oid;
206 struct strbuf snapshot = STRBUF_INIT;
207 int result = 1;
208
209 strbuf_addstr(&snapshot, filename);
210 strbuf_setlen(&snapshot, snapshot.len - strlen(format->suffix));
211
212 if (get_oid(snapshot.buf, &oid) == 0)
213 goto out;
214
215 reponame = cgit_snapshot_prefix(repo);
216 if (starts_with(snapshot.buf, reponame)) {
217 const char *new_start = snapshot.buf;
218 new_start += strlen(reponame);
219 while (new_start && (*new_start == '-' || *new_start == '_'))
220 new_start++;
221 strbuf_splice(&snapshot, 0, new_start - snapshot.buf, "", 0);
222 }
223
224 if (get_oid(snapshot.buf, &oid) == 0)
225 goto out;
226
227 strbuf_insert(&snapshot, 0, "v", 1);
228 if (get_oid(snapshot.buf, &oid) == 0)
229 goto out;
230
231 strbuf_splice(&snapshot, 0, 1, "V", 1);
232 if (get_oid(snapshot.buf, &oid) == 0)
233 goto out;
234
235 result = 0;
236 strbuf_release(&snapshot);
237
238out:
239 return result ? strbuf_detach(&snapshot, NULL) : NULL;
240}
241
242void cgit_print_snapshot(const char *head, const char *hex,
243 const char *filename, int dwim)
244{
245 const struct cgit_snapshot_format* f;
246 const char *sig_filename = NULL;
247 char *adj_filename = NULL;
248 char *prefix = NULL;
249
250 if (!filename) {
251 cgit_print_error_page(400, "Bad request",
252 "No snapshot name specified");
253 return;
254 }
255
256 if (ends_with(filename, ".asc")) {
257 sig_filename = filename;
258
259 /* Strip ".asc" from filename for common format processing */
260 adj_filename = xstrdup(filename);
261 adj_filename[strlen(adj_filename) - 4] = '\0';
262 filename = adj_filename;
263 }
264
265 f = get_format(filename);
266 if (!f || !(ctx.repo->snapshots & f->bit)) {
267 cgit_print_error_page(400, "Bad request",
268 "Unsupported snapshot format: %s", filename);
269 return;
270 }
271
272 if (!hex && dwim) {
273 hex = get_ref_from_filename(ctx.repo, filename, f);
274 if (hex == NULL) {
275 cgit_print_error_page(404, "Not found", "Not found");
276 return;
277 }
278 prefix = xstrdup(filename);
279 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
280 }
281
282 if (!hex)
283 hex = head;
284
285 if (!prefix)
286 prefix = xstrdup(cgit_snapshot_prefix(ctx.repo));
287
288 if (sig_filename)
289 write_sig(f, hex, filename, sig_filename);
290 else
291 make_snapshot(f, hex, prefix, filename);
292
293 free(prefix);
294 free(adj_filename);
295}