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 /* .tar must remain the 0 index */
90 { ".tar", "application/x-tar", write_tar_archive },
91 { ".tar.gz", "application/x-gzip", write_tar_gzip_archive },
92 { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive },
93 { ".tar.xz", "application/x-xz", write_tar_xz_archive },
94 { ".zip", "application/x-zip", write_zip_archive },
95 { NULL }
96};
97
98static struct notes_tree snapshot_sig_notes[ARRAY_SIZE(cgit_snapshot_formats)];
99
100const struct object_id *cgit_snapshot_get_sig(const char *ref,
101 const struct cgit_snapshot_format *f)
102{
103 struct notes_tree *tree;
104 struct object_id oid;
105
106 if (get_oid(ref, &oid))
107 return NULL;
108
109 tree = &snapshot_sig_notes[f - &cgit_snapshot_formats[0]];
110 if (!tree->initialized) {
111 struct strbuf notes_ref = STRBUF_INIT;
112
113 strbuf_addf(¬es_ref, "refs/notes/signatures/%s",
114 f->suffix + 1);
115
116 init_notes(tree, notes_ref.buf, combine_notes_ignore, 0);
117 strbuf_release(¬es_ref);
118 }
119
120 return get_note(tree, &oid);
121}
122
123static const struct cgit_snapshot_format *get_format(const char *filename)
124{
125 const struct cgit_snapshot_format *fmt;
126
127 for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
128 if (ends_with(filename, fmt->suffix))
129 return fmt;
130 }
131 return NULL;
132}
133
134const unsigned cgit_snapshot_format_bit(const struct cgit_snapshot_format *f)
135{
136 return BIT(f - &cgit_snapshot_formats[0]);
137}
138
139static int make_snapshot(const struct cgit_snapshot_format *format,
140 const char *hex, const char *prefix,
141 const char *filename)
142{
143 struct object_id oid;
144
145 if (get_oid(hex, &oid)) {
146 cgit_print_error_page(404, "Not found",
147 "Bad object id: %s", hex);
148 return 1;
149 }
150 if (!lookup_commit_reference(&oid)) {
151 cgit_print_error_page(400, "Bad request",
152 "Not a commit reference: %s", hex);
153 return 1;
154 }
155 ctx.page.etag = oid_to_hex(&oid);
156 ctx.page.mimetype = xstrdup(format->mimetype);
157 ctx.page.filename = xstrdup(filename);
158 cgit_print_http_headers();
159 format->write_func(hex, prefix);
160 return 0;
161}
162
163static int write_sig(const struct cgit_snapshot_format *format,
164 const char *hex, const char *archive,
165 const char *filename)
166{
167 const struct object_id *note = cgit_snapshot_get_sig(hex, format);
168 enum object_type type;
169 unsigned long size;
170 char *buf;
171
172 if (!note) {
173 cgit_print_error_page(404, "Not found",
174 "No signature for %s", archive);
175 return 0;
176 }
177
178 buf = read_object_file(note, &type, &size);
179 if (!buf) {
180 cgit_print_error_page(404, "Not found", "Not found");
181 return 0;
182 }
183
184 html("X-Content-Type-Options: nosniff\n");
185 html("Content-Security-Policy: default-src 'none'\n");
186 ctx.page.etag = oid_to_hex(note);
187 ctx.page.mimetype = xstrdup("application/pgp-signature");
188 ctx.page.filename = xstrdup(filename);
189 cgit_print_http_headers();
190
191 html_raw(buf, size);
192 free(buf);
193 return 0;
194}
195
196/* Try to guess the requested revision from the requested snapshot name.
197 * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
198 * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
199 * Otherwise, if the snapshot name has a prefix matching the result from
200 * repo_basename(), we strip the basename and any following '-' and '_'
201 * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
202 * more. If this still isn't a valid commit object name, we check if pre-
203 * pending a 'v' or a 'V' to the remaining snapshot name ("0.7.2" ->
204 * "v0.7.2") gives us something valid.
205 */
206static const char *get_ref_from_filename(const struct cgit_repo *repo,
207 const char *filename,
208 const struct cgit_snapshot_format *format)
209{
210 const char *reponame;
211 struct object_id oid;
212 struct strbuf snapshot = STRBUF_INIT;
213 int result = 1;
214
215 strbuf_addstr(&snapshot, filename);
216 strbuf_setlen(&snapshot, snapshot.len - strlen(format->suffix));
217
218 if (get_oid(snapshot.buf, &oid) == 0)
219 goto out;
220
221 reponame = cgit_snapshot_prefix(repo);
222 if (starts_with(snapshot.buf, reponame)) {
223 const char *new_start = snapshot.buf;
224 new_start += strlen(reponame);
225 while (new_start && (*new_start == '-' || *new_start == '_'))
226 new_start++;
227 strbuf_splice(&snapshot, 0, new_start - snapshot.buf, "", 0);
228 }
229
230 if (get_oid(snapshot.buf, &oid) == 0)
231 goto out;
232
233 strbuf_insert(&snapshot, 0, "v", 1);
234 if (get_oid(snapshot.buf, &oid) == 0)
235 goto out;
236
237 strbuf_splice(&snapshot, 0, 1, "V", 1);
238 if (get_oid(snapshot.buf, &oid) == 0)
239 goto out;
240
241 result = 0;
242 strbuf_release(&snapshot);
243
244out:
245 return result ? strbuf_detach(&snapshot, NULL) : NULL;
246}
247
248void cgit_print_snapshot(const char *head, const char *hex,
249 const char *filename, int dwim)
250{
251 const struct cgit_snapshot_format* f;
252 const char *sig_filename = NULL;
253 char *adj_filename = NULL;
254 char *prefix = NULL;
255
256 if (!filename) {
257 cgit_print_error_page(400, "Bad request",
258 "No snapshot name specified");
259 return;
260 }
261
262 if (ends_with(filename, ".asc")) {
263 sig_filename = filename;
264
265 /* Strip ".asc" from filename for common format processing */
266 adj_filename = xstrdup(filename);
267 adj_filename[strlen(adj_filename) - 4] = '\0';
268 filename = adj_filename;
269 }
270
271 f = get_format(filename);
272 if (!f || (!sig_filename && !(ctx.repo->snapshots & cgit_snapshot_format_bit(f)))) {
273 cgit_print_error_page(400, "Bad request",
274 "Unsupported snapshot format: %s", filename);
275 return;
276 }
277
278 if (!hex && dwim) {
279 hex = get_ref_from_filename(ctx.repo, filename, f);
280 if (hex == NULL) {
281 cgit_print_error_page(404, "Not found", "Not found");
282 return;
283 }
284 prefix = xstrdup(filename);
285 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
286 }
287
288 if (!hex)
289 hex = head;
290
291 if (!prefix)
292 prefix = xstrdup(cgit_snapshot_prefix(ctx.repo));
293
294 if (sig_filename)
295 write_sig(f, hex, filename, sig_filename);
296 else
297 make_snapshot(f, hex, prefix, filename);
298
299 free(prefix);
300 free(adj_filename);
301}