File: ui-snapshot.c

package info (click to toggle)
cgit 1.2.1+git2.18.0-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 37,580 kB
  • sloc: ansic: 207,716; sh: 172,917; perl: 28,960; tcl: 21,663; python: 6,441; makefile: 3,642; php: 120; asm: 98; csh: 45; ruby: 24; lisp: 12
file content (301 lines) | stat: -rw-r--r-- 8,192 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/* ui-snapshot.c: generate snapshot of a commit
 *
 * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"
#include "ui-snapshot.h"
#include "html.h"
#include "ui-shared.h"

static int write_archive_type(const char *format, const char *hex, const char *prefix)
{
	struct argv_array argv = ARGV_ARRAY_INIT;
	const char **nargv;
	int result;
	argv_array_push(&argv, "snapshot");
	argv_array_push(&argv, format);
	if (prefix) {
		struct strbuf buf = STRBUF_INIT;
		strbuf_addstr(&buf, prefix);
		strbuf_addch(&buf, '/');
		argv_array_push(&argv, "--prefix");
		argv_array_push(&argv, buf.buf);
		strbuf_release(&buf);
	}
	argv_array_push(&argv, hex);
	/*
	 * Now we need to copy the pointers to arguments into a new
	 * structure because write_archive will rearrange its arguments
	 * which may result in duplicated/missing entries causing leaks
	 * or double-frees in argv_array_clear.
	 */
	nargv = xmalloc(sizeof(char *) * (argv.argc + 1));
	/* argv_array guarantees a trailing NULL entry. */
	memcpy(nargv, argv.argv, sizeof(char *) * (argv.argc + 1));

	result = write_archive(argv.argc, nargv, NULL, NULL, 0);
	argv_array_clear(&argv);
	free(nargv);
	return result;
}

static int write_tar_archive(const char *hex, const char *prefix)
{
	return write_archive_type("--format=tar", hex, prefix);
}

static int write_zip_archive(const char *hex, const char *prefix)
{
	return write_archive_type("--format=zip", hex, prefix);
}

static int write_compressed_tar_archive(const char *hex,
					const char *prefix,
					char *filter_argv[])
{
	int rv;
	struct cgit_exec_filter f;
	cgit_exec_filter_init(&f, filter_argv[0], filter_argv);

	cgit_open_filter(&f.base);
	rv = write_tar_archive(hex, prefix);
	cgit_close_filter(&f.base);
	return rv;
}

static int write_tar_gzip_archive(const char *hex, const char *prefix)
{
	char *argv[] = { "gzip", "-n", NULL };
	return write_compressed_tar_archive(hex, prefix, argv);
}

static int write_tar_bzip2_archive(const char *hex, const char *prefix)
{
	char *argv[] = { "bzip2", NULL };
	return write_compressed_tar_archive(hex, prefix, argv);
}

static int write_tar_xz_archive(const char *hex, const char *prefix)
{
	char *argv[] = { "xz", NULL };
	return write_compressed_tar_archive(hex, prefix, argv);
}

const struct cgit_snapshot_format cgit_snapshot_formats[] = {
	/* .tar must remain the 0 index */
	{ ".tar",	"application/x-tar",	write_tar_archive	},
	{ ".tar.gz",	"application/x-gzip",	write_tar_gzip_archive	},
	{ ".tar.bz2",	"application/x-bzip2",	write_tar_bzip2_archive	},
	{ ".tar.xz",	"application/x-xz",	write_tar_xz_archive	},
	{ ".zip",	"application/x-zip",	write_zip_archive	},
	{ NULL }
};

static struct notes_tree snapshot_sig_notes[ARRAY_SIZE(cgit_snapshot_formats)];

const struct object_id *cgit_snapshot_get_sig(const char *ref,
					      const struct cgit_snapshot_format *f)
{
	struct notes_tree *tree;
	struct object_id oid;

	if (get_oid(ref, &oid))
		return NULL;

	tree = &snapshot_sig_notes[f - &cgit_snapshot_formats[0]];
	if (!tree->initialized) {
		struct strbuf notes_ref = STRBUF_INIT;

		strbuf_addf(&notes_ref, "refs/notes/signatures/%s",
			    f->suffix + 1);

		init_notes(tree, notes_ref.buf, combine_notes_ignore, 0);
		strbuf_release(&notes_ref);
	}

	return get_note(tree, &oid);
}

static const struct cgit_snapshot_format *get_format(const char *filename)
{
	const struct cgit_snapshot_format *fmt;

	for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
		if (ends_with(filename, fmt->suffix))
			return fmt;
	}
	return NULL;
}

const unsigned cgit_snapshot_format_bit(const struct cgit_snapshot_format *f)
{
	return BIT(f - &cgit_snapshot_formats[0]);
}

static int make_snapshot(const struct cgit_snapshot_format *format,
			 const char *hex, const char *prefix,
			 const char *filename)
{
	struct object_id oid;

	if (get_oid(hex, &oid)) {
		cgit_print_error_page(404, "Not found",
				"Bad object id: %s", hex);
		return 1;
	}
	if (!lookup_commit_reference(&oid)) {
		cgit_print_error_page(400, "Bad request",
				"Not a commit reference: %s", hex);
		return 1;
	}
	ctx.page.etag = oid_to_hex(&oid);
	ctx.page.mimetype = xstrdup(format->mimetype);
	ctx.page.filename = xstrdup(filename);
	cgit_print_http_headers();
	format->write_func(hex, prefix);
	return 0;
}

static int write_sig(const struct cgit_snapshot_format *format,
		     const char *hex, const char *archive,
		     const char *filename)
{
	const struct object_id *note = cgit_snapshot_get_sig(hex, format);
	enum object_type type;
	unsigned long size;
	char *buf;

	if (!note) {
		cgit_print_error_page(404, "Not found",
				"No signature for %s", archive);
		return 0;
	}

	buf = read_object_file(note, &type, &size);
	if (!buf) {
		cgit_print_error_page(404, "Not found", "Not found");
		return 0;
	}

	html("X-Content-Type-Options: nosniff\n");
	html("Content-Security-Policy: default-src 'none'\n");
	ctx.page.etag = oid_to_hex(note);
	ctx.page.mimetype = xstrdup("application/pgp-signature");
	ctx.page.filename = xstrdup(filename);
	cgit_print_http_headers();

	html_raw(buf, size);
	free(buf);
	return 0;
}

/* Try to guess the requested revision from the requested snapshot name.
 * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
 * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
 * Otherwise, if the snapshot name has a prefix matching the result from
 * repo_basename(), we strip the basename and any following '-' and '_'
 * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
 * more. If this still isn't a valid commit object name, we check if pre-
 * pending a 'v' or a 'V' to the remaining snapshot name ("0.7.2" ->
 * "v0.7.2") gives us something valid.
 */
static const char *get_ref_from_filename(const struct cgit_repo *repo,
					 const char *filename,
					 const struct cgit_snapshot_format *format)
{
	const char *reponame;
	struct object_id oid;
	struct strbuf snapshot = STRBUF_INIT;
	int result = 1;

	strbuf_addstr(&snapshot, filename);
	strbuf_setlen(&snapshot, snapshot.len - strlen(format->suffix));

	if (get_oid(snapshot.buf, &oid) == 0)
		goto out;

	reponame = cgit_snapshot_prefix(repo);
	if (starts_with(snapshot.buf, reponame)) {
		const char *new_start = snapshot.buf;
		new_start += strlen(reponame);
		while (new_start && (*new_start == '-' || *new_start == '_'))
			new_start++;
		strbuf_splice(&snapshot, 0, new_start - snapshot.buf, "", 0);
	}

	if (get_oid(snapshot.buf, &oid) == 0)
		goto out;

	strbuf_insert(&snapshot, 0, "v", 1);
	if (get_oid(snapshot.buf, &oid) == 0)
		goto out;

	strbuf_splice(&snapshot, 0, 1, "V", 1);
	if (get_oid(snapshot.buf, &oid) == 0)
		goto out;

	result = 0;
	strbuf_release(&snapshot);

out:
	return result ? strbuf_detach(&snapshot, NULL) : NULL;
}

void cgit_print_snapshot(const char *head, const char *hex,
			 const char *filename, int dwim)
{
	const struct cgit_snapshot_format* f;
	const char *sig_filename = NULL;
	char *adj_filename = NULL;
	char *prefix = NULL;

	if (!filename) {
		cgit_print_error_page(400, "Bad request",
				"No snapshot name specified");
		return;
	}

	if (ends_with(filename, ".asc")) {
		sig_filename = filename;

		/* Strip ".asc" from filename for common format processing */
		adj_filename = xstrdup(filename);
		adj_filename[strlen(adj_filename) - 4] = '\0';
		filename = adj_filename;
	}

	f = get_format(filename);
	if (!f || (!sig_filename && !(ctx.repo->snapshots & cgit_snapshot_format_bit(f)))) {
		cgit_print_error_page(400, "Bad request",
				"Unsupported snapshot format: %s", filename);
		return;
	}

	if (!hex && dwim) {
		hex = get_ref_from_filename(ctx.repo, filename, f);
		if (hex == NULL) {
			cgit_print_error_page(404, "Not found", "Not found");
			return;
		}
		prefix = xstrdup(filename);
		prefix[strlen(filename) - strlen(f->suffix)] = '\0';
	}

	if (!hex)
		hex = head;

	if (!prefix)
		prefix = xstrdup(cgit_snapshot_prefix(ctx.repo));

	if (sig_filename)
		write_sig(f, hex, filename, sig_filename);
	else
		make_snapshot(f, hex, prefix, filename);

	free(prefix);
	free(adj_filename);
}