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1 /* ui-shared.c: common web output functions
2  *
3  * Copyright (C) 2006-2017 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-shared.h"
11 #include "cmd.h"
12 #include "html.h"
13 #include "version.h"
14
15 static const char cgit_doctype[] =
16 "<!DOCTYPE html>\n";
17
18 static char *http_date(time_t t)
19 {
20         static char day[][4] =
21                 {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
22         static char month[][4] =
23                 {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
24                  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
25         struct tm tm;
26         gmtime_r(&t, &tm);
27         return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm.tm_wday],
28                    tm.tm_mday, month[tm.tm_mon], 1900 + tm.tm_year,
29                    tm.tm_hour, tm.tm_min, tm.tm_sec);
30 }
31
32 void cgit_print_error(const char *fmt, ...)
33 {
34         va_list ap;
35         va_start(ap, fmt);
36         cgit_vprint_error(fmt, ap);
37         va_end(ap);
38 }
39
40 void cgit_vprint_error(const char *fmt, va_list ap)
41 {
42         va_list cp;
43         html("<div class='error'>");
44         va_copy(cp, ap);
45         html_vtxtf(fmt, cp);
46         va_end(cp);
47         html("</div>\n");
48 }
49
50 const char *cgit_httpscheme(void)
51 {
52         if (ctx.env.https && !strcmp(ctx.env.https, "on"))
53                 return "https://";
54         else
55                 return "http://";
56 }
57
58 char *cgit_hosturl(void)
59 {
60         if (ctx.env.http_host)
61                 return xstrdup(ctx.env.http_host);
62         if (!ctx.env.server_name)
63                 return NULL;
64         if (!ctx.env.server_port || atoi(ctx.env.server_port) == 80)
65                 return xstrdup(ctx.env.server_name);
66         return fmtalloc("%s:%s", ctx.env.server_name, ctx.env.server_port);
67 }
68
69 char *cgit_currenturl(void)
70 {
71         const char *root = cgit_rooturl();
72
73         if (!ctx.qry.url)
74                 return xstrdup(root);
75         if (root[0] && root[strlen(root) - 1] == '/')
76                 return fmtalloc("%s%s", root, ctx.qry.url);
77         return fmtalloc("%s/%s", root, ctx.qry.url);
78 }
79
80 char *cgit_currentfullurl(void)
81 {
82         const char *root = cgit_rooturl();
83         const char *orig_query = ctx.env.query_string ? ctx.env.query_string : "";
84         size_t len = strlen(orig_query);
85         char *query = xmalloc(len + 2), *start_url, *ret;
86
87         /* Remove all url=... parts from query string */
88         memcpy(query + 1, orig_query, len + 1);
89         query[0] = '?';
90         start_url = query;
91         while ((start_url = strstr(start_url, "url=")) != NULL) {
92                 if (start_url[-1] == '?' || start_url[-1] == '&') {
93                         const char *end_url = strchr(start_url, '&');
94                         if (end_url)
95                                 memmove(start_url, end_url + 1, strlen(end_url));
96                         else
97                                 start_url[0] = '\0';
98                 } else
99                         ++start_url;
100         }
101         if (!query[1])
102                 query[0] = '\0';
103
104         if (!ctx.qry.url)
105                 ret = fmtalloc("%s%s", root, query);
106         else if (root[0] && root[strlen(root) - 1] == '/')
107                 ret = fmtalloc("%s%s%s", root, ctx.qry.url, query);
108         else
109                 ret = fmtalloc("%s/%s%s", root, ctx.qry.url, query);
110         free(query);
111         return ret;
112 }
113
114 const char *cgit_rooturl(void)
115 {
116         if (ctx.cfg.virtual_root)
117                 return ctx.cfg.virtual_root;
118         else
119                 return ctx.cfg.script_name;
120 }
121
122 const char *cgit_loginurl(void)
123 {
124         static const char *login_url;
125         if (!login_url)
126                 login_url = fmtalloc("%s?p=login", cgit_rooturl());
127         return login_url;
128 }
129
130 char *cgit_repourl(const char *reponame)
131 {
132         if (ctx.cfg.virtual_root)
133                 return fmtalloc("%s%s/", ctx.cfg.virtual_root, reponame);
134         else
135                 return fmtalloc("?r=%s", reponame);
136 }
137
138 char *cgit_fileurl(const char *reponame, const char *pagename,
139                    const char *filename, const char *query)
140 {
141         struct strbuf sb = STRBUF_INIT;
142         char *delim;
143
144         if (ctx.cfg.virtual_root) {
145                 strbuf_addf(&sb, "%s%s/%s/%s", ctx.cfg.virtual_root, reponame,
146                             pagename, (filename ? filename:""));
147                 delim = "?";
148         } else {
149                 strbuf_addf(&sb, "?url=%s/%s/%s", reponame, pagename,
150                             (filename ? filename : ""));
151                 delim = "&amp;";
152         }
153         if (query)
154                 strbuf_addf(&sb, "%s%s", delim, query);
155         return strbuf_detach(&sb, NULL);
156 }
157
158 char *cgit_pageurl(const char *reponame, const char *pagename,
159                    const char *query)
160 {
161         return cgit_fileurl(reponame, pagename, NULL, query);
162 }
163
164 const char *cgit_repobasename(const char *reponame)
165 {
166         /* I assume we don't need to store more than one repo basename */
167         static char rvbuf[1024];
168         int p;
169         const char *rv;
170         size_t len;
171
172         len = strlcpy(rvbuf, reponame, sizeof(rvbuf));
173         if (len >= sizeof(rvbuf))
174                 die("cgit_repobasename: truncated repository name '%s'", reponame);
175         p = len - 1;
176         /* strip trailing slashes */
177         while (p && rvbuf[p] == '/')
178                 rvbuf[p--] = '\0';
179         /* strip trailing .git */
180         if (p >= 3 && starts_with(&rvbuf[p-3], ".git")) {
181                 p -= 3;
182                 rvbuf[p--] = '\0';
183         }
184         /* strip more trailing slashes if any */
185         while (p && rvbuf[p] == '/')
186                 rvbuf[p--] = '\0';
187         /* find last slash in the remaining string */
188         rv = strrchr(rvbuf, '/');
189         if (rv)
190                 return ++rv;
191         return rvbuf;
192 }
193
194 const char *cgit_snapshot_prefix(const struct cgit_repo *repo)
195 {
196         if (repo->snapshot_prefix)
197                 return repo->snapshot_prefix;
198
199         return cgit_repobasename(repo->url);
200 }
201
202 static void site_url(const char *page, const char *search, const char *sort, int ofs, int always_root)
203 {
204         char *delim = "?";
205
206         if (always_root || page)
207                 html_attr(cgit_rooturl());
208         else {
209                 char *currenturl = cgit_currenturl();
210                 html_attr(currenturl);
211                 free(currenturl);
212         }
213
214         if (page) {
215                 htmlf("?p=%s", page);
216                 delim = "&amp;";
217         }
218         if (search) {
219                 html(delim);
220                 html("q=");
221                 html_attr(search);
222                 delim = "&amp;";
223         }
224         if (sort) {
225                 html(delim);
226                 html("s=");
227                 html_attr(sort);
228                 delim = "&amp;";
229         }
230         if (ofs) {
231                 html(delim);
232                 htmlf("ofs=%d", ofs);
233         }
234 }
235
236 static void site_link(const char *page, const char *name, const char *title,
237                       const char *class, const char *search, const char *sort, int ofs, int always_root)
238 {
239         html("<a");
240         if (title) {
241                 html(" title='");
242                 html_attr(title);
243                 html("'");
244         }
245         if (class) {
246                 html(" class='");
247                 html_attr(class);
248                 html("'");
249         }
250         html(" href='");
251         site_url(page, search, sort, ofs, always_root);
252         html("'>");
253         html_txt(name);
254         html("</a>");
255 }
256
257 void cgit_index_link(const char *name, const char *title, const char *class,
258                      const char *pattern, const char *sort, int ofs, int always_root)
259 {
260         site_link(NULL, name, title, class, pattern, sort, ofs, always_root);
261 }
262
263 static char *repolink(const char *title, const char *class, const char *page,
264                       const char *head, const char *path)
265 {
266         char *delim = "?";
267
268         html("<a");
269         if (title) {
270                 html(" title='");
271                 html_attr(title);
272                 html("'");
273         }
274         if (class) {
275                 html(" class='");
276                 html_attr(class);
277                 html("'");
278         }
279         html(" href='");
280         if (ctx.cfg.virtual_root) {
281                 html_url_path(ctx.cfg.virtual_root);
282                 html_url_path(ctx.repo->url);
283                 if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
284                         html("/");
285                 if (page) {
286                         html_url_path(page);
287                         html("/");
288                         if (path)
289                                 html_url_path(path);
290                 }
291         } else {
292                 html_url_path(ctx.cfg.script_name);
293                 html("?url=");
294                 html_url_arg(ctx.repo->url);
295                 if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
296                         html("/");
297                 if (page) {
298                         html_url_arg(page);
299                         html("/");
300                         if (path)
301                                 html_url_arg(path);
302                 }
303                 delim = "&amp;";
304         }
305         if (head && ctx.repo->defbranch && strcmp(head, ctx.repo->defbranch)) {
306                 html(delim);
307                 html("h=");
308                 html_url_arg(head);
309                 delim = "&amp;";
310         }
311         return fmt("%s", delim);
312 }
313
314 static void reporevlink(const char *page, const char *name, const char *title,
315                         const char *class, const char *head, const char *rev,
316                         const char *path)
317 {
318         char *delim;
319
320         delim = repolink(title, class, page, head, path);
321         if (rev && ctx.qry.head != NULL && strcmp(rev, ctx.qry.head)) {
322                 html(delim);
323                 html("id=");
324                 html_url_arg(rev);
325         }
326         html("'>");
327         html_txt(name);
328         html("</a>");
329 }
330
331 void cgit_summary_link(const char *name, const char *title, const char *class,
332                        const char *head)
333 {
334         reporevlink(NULL, name, title, class, head, NULL, NULL);
335 }
336
337 void cgit_tag_link(const char *name, const char *title, const char *class,
338                    const char *tag)
339 {
340         reporevlink("tag", name, title, class, tag, NULL, NULL);
341 }
342
343 void cgit_tree_link(const char *name, const char *title, const char *class,
344                     const char *head, const char *rev, const char *path)
345 {
346         reporevlink("tree", name, title, class, head, rev, path);
347 }
348
349 void cgit_plain_link(const char *name, const char *title, const char *class,
350                      const char *head, const char *rev, const char *path)
351 {
352         reporevlink("plain", name, title, class, head, rev, path);
353 }
354
355 void cgit_blame_link(const char *name, const char *title, const char *class,
356                      const char *head, const char *rev, const char *path)
357 {
358         reporevlink("blame", name, title, class, head, rev, path);
359 }
360
361 void cgit_log_link(const char *name, const char *title, const char *class,
362                    const char *head, const char *rev, const char *path,
363                    int ofs, const char *grep, const char *pattern, int showmsg,
364                    int follow)
365 {
366         char *delim;
367
368         delim = repolink(title, class, "log", head, path);
369         if (rev && ctx.qry.head && strcmp(rev, ctx.qry.head)) {
370                 html(delim);
371                 html("id=");
372                 html_url_arg(rev);
373                 delim = "&amp;";
374         }
375         if (grep && pattern) {
376                 html(delim);
377                 html("qt=");
378                 html_url_arg(grep);
379                 delim = "&amp;";
380                 html(delim);
381                 html("q=");
382                 html_url_arg(pattern);
383         }
384         if (ofs > 0) {
385                 html(delim);
386                 html("ofs=");
387                 htmlf("%d", ofs);
388                 delim = "&amp;";
389         }
390         if (showmsg) {
391                 html(delim);
392                 html("showmsg=1");
393                 delim = "&amp;";
394         }
395         if (follow) {
396                 html(delim);
397                 html("follow=1");
398         }
399         html("'>");
400         html_txt(name);
401         html("</a>");
402 }
403
404 void cgit_commit_link(const char *name, const char *title, const char *class,
405                       const char *head, const char *rev, const char *path)
406 {
407         char *delim;
408
409         delim = repolink(title, class, "commit", head, path);
410         if (rev && ctx.qry.head && strcmp(rev, ctx.qry.head)) {
411                 html(delim);
412                 html("id=");
413                 html_url_arg(rev);
414                 delim = "&amp;";
415         }
416         if (ctx.qry.difftype) {
417                 html(delim);
418                 htmlf("dt=%d", ctx.qry.difftype);
419                 delim = "&amp;";
420         }
421         if (ctx.qry.context > 0 && ctx.qry.context != 3) {
422                 html(delim);
423                 html("context=");
424                 htmlf("%d", ctx.qry.context);
425                 delim = "&amp;";
426         }
427         if (ctx.qry.ignorews) {
428                 html(delim);
429                 html("ignorews=1");
430                 delim = "&amp;";
431         }
432         if (ctx.qry.follow) {
433                 html(delim);
434                 html("follow=1");
435         }
436         html("'>");
437         if (name[0] != '\0') {
438                 if (strlen(name) > ctx.cfg.max_msg_len && ctx.cfg.max_msg_len >= 15) {
439                         html_ntxt(name, ctx.cfg.max_msg_len - 3);
440                         html("...");
441                 } else
442                         html_txt(name);
443         } else
444                 html_txt("(no commit message)");
445         html("</a>");
446 }
447
448 void cgit_refs_link(const char *name, const char *title, const char *class,
449                     const char *head, const char *rev, const char *path)
450 {
451         reporevlink("refs", name, title, class, head, rev, path);
452 }
453
454 void cgit_snapshot_link(const char *name, const char *title, const char *class,
455                         const char *head, const char *rev,
456                         const char *archivename)
457 {
458         reporevlink("snapshot", name, title, class, head, rev, archivename);
459 }
460
461 void cgit_diff_link(const char *name, const char *title, const char *class,
462                     const char *head, const char *new_rev, const char *old_rev,
463                     const char *path)
464 {
465         char *delim;
466
467         delim = repolink(title, class, "diff", head, path);
468         if (new_rev && ctx.qry.head != NULL && strcmp(new_rev, ctx.qry.head)) {
469                 html(delim);
470                 html("id=");
471                 html_url_arg(new_rev);
472                 delim = "&amp;";
473         }
474         if (old_rev) {
475                 html(delim);
476                 html("id2=");
477                 html_url_arg(old_rev);
478                 delim = "&amp;";
479         }
480         if (ctx.qry.difftype) {
481                 html(delim);
482                 htmlf("dt=%d", ctx.qry.difftype);
483                 delim = "&amp;";
484         }
485         if (ctx.qry.context > 0 && ctx.qry.context != 3) {
486                 html(delim);
487                 html("context=");
488                 htmlf("%d", ctx.qry.context);
489                 delim = "&amp;";
490         }
491         if (ctx.qry.ignorews) {
492                 html(delim);
493                 html("ignorews=1");
494                 delim = "&amp;";
495         }
496         if (ctx.qry.follow) {
497                 html(delim);
498                 html("follow=1");
499         }
500         html("'>");
501         html_txt(name);
502         html("</a>");
503 }
504
505 void cgit_patch_link(const char *name, const char *title, const char *class,
506                      const char *head, const char *rev, const char *path)
507 {
508         reporevlink("patch", name, title, class, head, rev, path);
509 }
510
511 void cgit_stats_link(const char *name, const char *title, const char *class,
512                      const char *head, const char *path)
513 {
514         reporevlink("stats", name, title, class, head, NULL, path);
515 }
516
517 static void cgit_self_link(char *name, const char *title, const char *class)
518 {
519         if (!strcmp(ctx.qry.page, "repolist"))
520                 cgit_index_link(name, title, class, ctx.qry.search, ctx.qry.sort,
521                                 ctx.qry.ofs, 1);
522         else if (!strcmp(ctx.qry.page, "summary"))
523                 cgit_summary_link(name, title, class, ctx.qry.head);
524         else if (!strcmp(ctx.qry.page, "tag"))
525                 cgit_tag_link(name, title, class, ctx.qry.has_oid ?
526                                ctx.qry.oid : ctx.qry.head);
527         else if (!strcmp(ctx.qry.page, "tree"))
528                 cgit_tree_link(name, title, class, ctx.qry.head,
529                                ctx.qry.has_oid ? ctx.qry.oid : NULL,
530                                ctx.qry.path);
531         else if (!strcmp(ctx.qry.page, "plain"))
532                 cgit_plain_link(name, title, class, ctx.qry.head,
533                                 ctx.qry.has_oid ? ctx.qry.oid : NULL,
534                                 ctx.qry.path);
535         else if (!strcmp(ctx.qry.page, "blame"))
536                 cgit_blame_link(name, title, class, ctx.qry.head,
537                                 ctx.qry.has_oid ? ctx.qry.oid : NULL,
538                                 ctx.qry.path);
539         else if (!strcmp(ctx.qry.page, "log"))
540                 cgit_log_link(name, title, class, ctx.qry.head,
541                               ctx.qry.has_oid ? ctx.qry.oid : NULL,
542                               ctx.qry.path, ctx.qry.ofs,
543                               ctx.qry.grep, ctx.qry.search,
544                               ctx.qry.showmsg, ctx.qry.follow);
545         else if (!strcmp(ctx.qry.page, "commit"))
546                 cgit_commit_link(name, title, class, ctx.qry.head,
547                                  ctx.qry.has_oid ? ctx.qry.oid : NULL,
548                                  ctx.qry.path);
549         else if (!strcmp(ctx.qry.page, "patch"))
550                 cgit_patch_link(name, title, class, ctx.qry.head,
551                                 ctx.qry.has_oid ? ctx.qry.oid : NULL,
552                                 ctx.qry.path);
553         else if (!strcmp(ctx.qry.page, "refs"))
554                 cgit_refs_link(name, title, class, ctx.qry.head,
555                                ctx.qry.has_oid ? ctx.qry.oid : NULL,
556                                ctx.qry.path);
557         else if (!strcmp(ctx.qry.page, "snapshot"))
558                 cgit_snapshot_link(name, title, class, ctx.qry.head,
559                                    ctx.qry.has_oid ? ctx.qry.oid : NULL,
560                                    ctx.qry.path);
561         else if (!strcmp(ctx.qry.page, "diff"))
562                 cgit_diff_link(name, title, class, ctx.qry.head,
563                                ctx.qry.oid, ctx.qry.oid2,
564                                ctx.qry.path);
565         else if (!strcmp(ctx.qry.page, "stats"))
566                 cgit_stats_link(name, title, class, ctx.qry.head,
567                                 ctx.qry.path);
568         else {
569                 /* Don't known how to make link for this page */
570                 repolink(title, class, ctx.qry.page, ctx.qry.head, ctx.qry.path);
571                 html("><!-- cgit_self_link() doesn't know how to make link for page '");
572                 html_txt(ctx.qry.page);
573                 html("' -->");
574                 html_txt(name);
575                 html("</a>");
576         }
577 }
578
579 void cgit_object_link(struct object *obj)
580 {
581         char *page, *shortrev, *fullrev, *name;
582
583         fullrev = oid_to_hex(&obj->oid);
584         shortrev = xstrdup(fullrev);
585         shortrev[10] = '\0';
586         if (obj->type == OBJ_COMMIT) {
587                 cgit_commit_link(fmt("commit %s...", shortrev), NULL, NULL,
588                                  ctx.qry.head, fullrev, NULL);
589                 return;
590         } else if (obj->type == OBJ_TREE)
591                 page = "tree";
592         else if (obj->type == OBJ_TAG)
593                 page = "tag";
594         else
595                 page = "blob";
596         name = fmt("%s %s...", type_name(obj->type), shortrev);
597         reporevlink(page, name, NULL, NULL, ctx.qry.head, fullrev, NULL);
598 }
599
600 static struct string_list_item *lookup_path(struct string_list *list,
601                                             const char *path)
602 {
603         struct string_list_item *item;
604
605         while (path && path[0]) {
606                 if ((item = string_list_lookup(list, path)))
607                         return item;
608                 if (!(path = strchr(path, '/')))
609                         break;
610                 path++;
611         }
612         return NULL;
613 }
614
615 void cgit_submodule_link(const char *class, char *path, const char *rev)
616 {
617         struct string_list *list;
618         struct string_list_item *item;
619         char tail, *dir;
620         size_t len;
621
622         len = 0;
623         tail = 0;
624         list = &ctx.repo->submodules;
625         item = lookup_path(list, path);
626         if (!item) {
627                 len = strlen(path);
628                 tail = path[len - 1];
629                 if (tail == '/') {
630                         path[len - 1] = 0;
631                         item = lookup_path(list, path);
632                 }
633         }
634         if (item || ctx.repo->module_link) {
635                 html("<a ");
636                 if (class)
637                         htmlf("class='%s' ", class);
638                 html("href='");
639                 if (item) {
640                         html_attrf(item->util, rev);
641                 } else {
642                         dir = strrchr(path, '/');
643                         if (dir)
644                                 dir++;
645                         else
646                                 dir = path;
647                         html_attrf(ctx.repo->module_link, dir, rev);
648                 }
649                 html("'>");
650                 html_txt(path);
651                 html("</a>");
652         } else {
653                 html("<span");
654                 if (class)
655                         htmlf(" class='%s'", class);
656                 html(">");
657                 html_txt(path);
658                 html("</span>");
659         }
660         html_txtf(" @ %.7s", rev);
661         if (item && tail)
662                 path[len - 1] = tail;
663 }
664
665 const struct date_mode *cgit_date_mode(enum date_mode_type type)
666 {
667         static struct date_mode mode;
668         mode.type = type;
669         mode.local = ctx.cfg.local_time;
670         return &mode;
671 }
672
673 static void print_rel_date(time_t t, int tz, double value,
674         const char *class, const char *suffix)
675 {
676         htmlf("<span class='%s' data-ut='%" PRIu64 "' title='", class, (uint64_t)t);
677         html_attr(show_date(t, tz, cgit_date_mode(DATE_ISO8601)));
678         htmlf("'>%.0f %s</span>", value, suffix);
679 }
680
681 void cgit_print_age(time_t t, int tz, time_t max_relative)
682 {
683         time_t now, secs;
684
685         if (!t)
686                 return;
687         time(&now);
688         secs = now - t;
689         if (secs < 0)
690                 secs = 0;
691
692         if (secs > max_relative && max_relative >= 0) {
693                 html("<span title='");
694                 html_attr(show_date(t, tz, cgit_date_mode(DATE_ISO8601)));
695                 html("'>");
696                 html_txt(show_date(t, tz, cgit_date_mode(DATE_SHORT)));
697                 html("</span>");
698                 return;
699         }
700
701         if (secs < TM_HOUR * 2) {
702                 print_rel_date(t, tz, secs * 1.0 / TM_MIN, "age-mins", "min.");
703                 return;
704         }
705         if (secs < TM_DAY * 2) {
706                 print_rel_date(t, tz, secs * 1.0 / TM_HOUR, "age-hours", "hours");
707                 return;
708         }
709         if (secs < TM_WEEK * 2) {
710                 print_rel_date(t, tz, secs * 1.0 / TM_DAY, "age-days", "days");
711                 return;
712         }
713         if (secs < TM_MONTH * 2) {
714                 print_rel_date(t, tz, secs * 1.0 / TM_WEEK, "age-weeks", "weeks");
715                 return;
716         }
717         if (secs < TM_YEAR * 2) {
718                 print_rel_date(t, tz, secs * 1.0 / TM_MONTH, "age-months", "months");
719                 return;
720         }
721         print_rel_date(t, tz, secs * 1.0 / TM_YEAR, "age-years", "years");
722 }
723
724 void cgit_print_http_headers(void)
725 {
726         if (ctx.env.no_http && !strcmp(ctx.env.no_http, "1"))
727                 return;
728
729         if (ctx.page.status)
730                 htmlf("Status: %d %s\n", ctx.page.status, ctx.page.statusmsg);
731         if (ctx.page.mimetype && ctx.page.charset)
732                 htmlf("Content-Type: %s; charset=%s\n", ctx.page.mimetype,
733                       ctx.page.charset);
734         else if (ctx.page.mimetype)
735                 htmlf("Content-Type: %s\n", ctx.page.mimetype);
736         if (ctx.page.size)
737                 htmlf("Content-Length: %zd\n", ctx.page.size);
738         if (ctx.page.filename) {
739                 html("Content-Disposition: inline; filename=\"");
740                 html_header_arg_in_quotes(ctx.page.filename);
741                 html("\"\n");
742         }
743         if (!ctx.env.authenticated)
744                 html("Cache-Control: no-cache, no-store\n");
745         htmlf("Last-Modified: %s\n", http_date(ctx.page.modified));
746         htmlf("Expires: %s\n", http_date(ctx.page.expires));
747         if (ctx.page.etag)
748                 htmlf("ETag: \"%s\"\n", ctx.page.etag);
749         html("\n");
750         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
751                 exit(0);
752 }
753
754 void cgit_redirect(const char *url, bool permanent)
755 {
756         htmlf("Status: %d %s\n", permanent ? 301 : 302, permanent ? "Moved" : "Found");
757         html("Location: ");
758         html_url_path(url);
759         html("\n\n");
760 }
761
762 static void print_rel_vcs_link(const char *url)
763 {
764         html("<link rel='vcs-git' href='");
765         html_attr(url);
766         html("' title='");
767         html_attr(ctx.repo->name);
768         html(" Git repository'/>\n");
769 }
770
771 static int emit_css_link(struct string_list_item *s, void *arg)
772 {
773         /* Do not emit anything if css= is specified. */
774         if (s && *s->string == '\0')
775                 return 0;
776
777         html("<link rel='stylesheet' type='text/css' href='");
778         if (s)
779                 html_attr(s->string);
780         else
781                 html_attr((const char *)arg);
782         html("'/>\n");
783
784         return 0;
785 }
786
787 static int emit_js_link(struct string_list_item *s, void *arg)
788 {
789         /* Do not emit anything if js= is specified. */
790         if (s && *s->string == '\0')
791                 return 0;
792
793         html("<script type='text/javascript' src='");
794         if (s)
795                 html_attr(s->string);
796         else
797                 html_attr((const char *)arg);
798         html("'></script>\n");
799
800         return 0;
801 }
802
803 void cgit_print_docstart(void)
804 {
805         char *host = cgit_hosturl();
806
807         if (ctx.cfg.embedded) {
808                 if (ctx.cfg.header)
809                         html_include(ctx.cfg.header);
810                 return;
811         }
812
813         html(cgit_doctype);
814         html("<html lang='en'>\n");
815         html("<head>\n");
816         html("<title>");
817         html_txt(ctx.page.title);
818         html("</title>\n");
819         htmlf("<meta name='generator' content='cgit %s'/>\n", cgit_version);
820         if (ctx.cfg.robots && *ctx.cfg.robots)
821                 htmlf("<meta name='robots' content='%s'/>\n", ctx.cfg.robots);
822
823         if (ctx.cfg.css.items)
824                 for_each_string_list(&ctx.cfg.css, emit_css_link, NULL);
825         else
826                 emit_css_link(NULL, "/cgit.css");
827
828         if (ctx.cfg.js.items)
829                 for_each_string_list(&ctx.cfg.js, emit_js_link, NULL);
830         else
831                 emit_js_link(NULL, "/cgit.js");
832
833         if (ctx.cfg.favicon) {
834                 html("<link rel='shortcut icon' href='");
835                 html_attr(ctx.cfg.favicon);
836                 html("'/>\n");
837         }
838         if (host && ctx.repo && ctx.qry.head) {
839                 char *fileurl;
840                 struct strbuf sb = STRBUF_INIT;
841                 strbuf_addf(&sb, "h=%s", ctx.qry.head);
842
843                 html("<link rel='alternate' title='Atom feed' href='");
844                 html(cgit_httpscheme());
845                 html_attr(host);
846                 fileurl = cgit_fileurl(ctx.repo->url, "atom", ctx.qry.vpath,
847                                        sb.buf);
848                 html_attr(fileurl);
849                 html("' type='application/atom+xml'/>\n");
850                 strbuf_release(&sb);
851                 free(fileurl);
852         }
853         if (ctx.repo)
854                 cgit_add_clone_urls(print_rel_vcs_link);
855         if (ctx.cfg.head_include)
856                 html_include(ctx.cfg.head_include);
857         if (ctx.repo && ctx.repo->extra_head_content)
858                 html(ctx.repo->extra_head_content);
859         html("</head>\n");
860         html("<body>\n");
861         if (ctx.cfg.header)
862                 html_include(ctx.cfg.header);
863         free(host);
864 }
865
866 void cgit_print_docend(void)
867 {
868         html("</div> <!-- class=content -->\n");
869         if (ctx.cfg.embedded) {
870                 html("</div> <!-- id=cgit -->\n");
871                 if (ctx.cfg.footer)
872                         html_include(ctx.cfg.footer);
873                 return;
874         }
875         if (ctx.cfg.footer)
876                 html_include(ctx.cfg.footer);
877         else {
878                 htmlf("<div class='footer'>generated by <a href='https://git.zx2c4.com/cgit/about/'>cgit %s</a> "
879                         "(<a href='https://git-scm.com/'>git %s</a>) at ", cgit_version, git_version_string);
880                 html_txt(show_date(time(NULL), 0, cgit_date_mode(DATE_ISO8601)));
881                 html("</div>\n");
882         }
883         html("</div> <!-- id=cgit -->\n");
884         html("</body>\n</html>\n");
885 }
886
887 void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)
888 {
889         va_list ap;
890         ctx.page.expires = ctx.cfg.cache_dynamic_ttl;
891         ctx.page.status = code;
892         ctx.page.statusmsg = msg;
893         cgit_print_layout_start();
894         va_start(ap, fmt);
895         cgit_vprint_error(fmt, ap);
896         va_end(ap);
897         cgit_print_layout_end();
898 }
899
900 void cgit_print_layout_start(void)
901 {
902         cgit_print_http_headers();
903         cgit_print_docstart();
904         cgit_print_pageheader();
905 }
906
907 void cgit_print_layout_end(void)
908 {
909         cgit_print_docend();
910 }
911
912 static void add_clone_urls(void (*fn)(const char *), char *txt, char *suffix)
913 {
914         struct strbuf **url_list = strbuf_split_str(txt, ' ', 0);
915         int i;
916
917         for (i = 0; url_list[i]; i++) {
918                 strbuf_rtrim(url_list[i]);
919                 if (url_list[i]->len == 0)
920                         continue;
921                 if (suffix && *suffix)
922                         strbuf_addf(url_list[i], "/%s", suffix);
923                 fn(url_list[i]->buf);
924         }
925
926         strbuf_list_free(url_list);
927 }
928
929 void cgit_add_clone_urls(void (*fn)(const char *))
930 {
931         if (ctx.repo->clone_url)
932                 add_clone_urls(fn, expand_macros(ctx.repo->clone_url), NULL);
933         else if (ctx.cfg.clone_prefix)
934                 add_clone_urls(fn, ctx.cfg.clone_prefix, ctx.repo->url);
935 }
936
937 static int print_branch_option(const char *refname, const struct object_id *oid,
938                                int flags, void *cb_data)
939 {
940         char *name = (char *)refname;
941         html_option(name, name, ctx.qry.head);
942         return 0;
943 }
944
945 void cgit_add_hidden_formfields(int incl_head, int incl_search,
946                                 const char *page)
947 {
948         if (!ctx.cfg.virtual_root) {
949                 struct strbuf url = STRBUF_INIT;
950
951                 strbuf_addf(&url, "%s/%s", ctx.qry.repo, page);
952                 if (ctx.qry.vpath)
953                         strbuf_addf(&url, "/%s", ctx.qry.vpath);
954                 html_hidden("url", url.buf);
955                 strbuf_release(&url);
956         }
957
958         if (incl_head && ctx.qry.head && ctx.repo->defbranch &&
959             strcmp(ctx.qry.head, ctx.repo->defbranch))
960                 html_hidden("h", ctx.qry.head);
961
962         if (ctx.qry.oid)
963                 html_hidden("id", ctx.qry.oid);
964         if (ctx.qry.oid2)
965                 html_hidden("id2", ctx.qry.oid2);
966         if (ctx.qry.showmsg)
967                 html_hidden("showmsg", "1");
968
969         if (incl_search) {
970                 if (ctx.qry.grep)
971                         html_hidden("qt", ctx.qry.grep);
972                 if (ctx.qry.search)
973                         html_hidden("q", ctx.qry.search);
974         }
975 }
976
977 static const char *hc(const char *page)
978 {
979         if (!ctx.qry.page)
980                 return NULL;
981
982         return strcmp(ctx.qry.page, page) ? NULL : "active";
983 }
984
985 static void cgit_print_path_crumbs(char *path)
986 {
987         char *old_path = ctx.qry.path;
988         char *p = path, *q, *end = path + strlen(path);
989         int levels = 0;
990
991         ctx.qry.path = NULL;
992         cgit_self_link("root", NULL, NULL);
993         ctx.qry.path = p = path;
994         while (p < end) {
995                 if (!(q = strchr(p, '/')) || levels > 15)
996                         q = end;
997                 *q = '\0';
998                 html_txt("/");
999                 cgit_self_link(p, NULL, NULL);
1000                 if (q < end)
1001                         *q = '/';
1002                 p = q + 1;
1003                 ++levels;
1004         }
1005         ctx.qry.path = old_path;
1006 }
1007
1008 static void print_header(void)
1009 {
1010         char *logo = NULL, *logo_link = NULL;
1011
1012         html("<table id='header'>\n");
1013         html("<tr>\n");
1014
1015         if (ctx.repo && ctx.repo->logo && *ctx.repo->logo)
1016                 logo = ctx.repo->logo;
1017         else
1018                 logo = ctx.cfg.logo;
1019         if (ctx.repo && ctx.repo->logo_link && *ctx.repo->logo_link)
1020                 logo_link = ctx.repo->logo_link;
1021         else
1022                 logo_link = ctx.cfg.logo_link;
1023         if (logo && *logo) {
1024                 html("<td class='logo' rowspan='2'><a href='");
1025                 if (logo_link && *logo_link)
1026                         html_attr(logo_link);
1027                 else
1028                         html_attr(cgit_rooturl());
1029                 html("'><img src='");
1030                 html_attr(logo);
1031                 html("' alt='cgit logo'/></a></td>\n");
1032         }
1033
1034         html("<td class='main'>");
1035         if (ctx.repo) {
1036                 cgit_index_link("index", NULL, NULL, NULL, NULL, 0, 1);
1037                 html(" : ");
1038                 cgit_summary_link(ctx.repo->name, NULL, NULL, NULL);
1039                 if (ctx.env.authenticated) {
1040                         html("</td><td class='form'>");
1041                         html("<form method='get'>\n");
1042                         cgit_add_hidden_formfields(0, 1, ctx.qry.page);
1043                         html("<select name='h' onchange='this.form.submit();'>\n");
1044                         for_each_branch_ref(print_branch_option, ctx.qry.head);
1045                         if (ctx.repo->enable_remote_branches)
1046                                 for_each_remote_ref(print_branch_option, ctx.qry.head);
1047                         html("</select> ");
1048                         html("<input type='submit' value='switch'/>");
1049                         html("</form>");
1050                 }
1051         } else
1052                 html_txt(ctx.cfg.root_title);
1053         html("</td></tr>\n");
1054
1055         html("<tr><td class='sub'>");
1056         if (ctx.repo) {
1057                 html_txt(ctx.repo->desc);
1058                 html("</td><td class='sub right'>");
1059                 if (ctx.repo->owner_filter) {
1060                         cgit_open_filter(ctx.repo->owner_filter);
1061                         html_txt(ctx.repo->owner);
1062                         cgit_close_filter(ctx.repo->owner_filter);
1063                 } else {
1064                         html_txt(ctx.repo->owner);
1065                 }
1066         } else {
1067                 if (ctx.cfg.root_desc)
1068                         html_txt(ctx.cfg.root_desc);
1069         }
1070         html("</td></tr></table>\n");
1071 }
1072
1073 void cgit_print_pageheader(void)
1074 {
1075         html("<div id='cgit'>");
1076         if (!ctx.env.authenticated || !ctx.cfg.noheader)
1077                 print_header();
1078
1079         html("<table class='tabs'><tr><td>\n");
1080         if (ctx.env.authenticated && ctx.repo) {
1081                 if (ctx.repo->readme.nr)
1082                         reporevlink("about", "about", NULL,
1083                                     hc("about"), ctx.qry.head, NULL,
1084                                     NULL);
1085                 cgit_summary_link("summary", NULL, hc("summary"),
1086                                   ctx.qry.head);
1087                 cgit_refs_link("refs", NULL, hc("refs"), ctx.qry.head,
1088                                ctx.qry.oid, NULL);
1089                 cgit_log_link("log", NULL, hc("log"), ctx.qry.head,
1090                               NULL, ctx.qry.vpath, 0, NULL, NULL,
1091                               ctx.qry.showmsg, ctx.qry.follow);
1092                 if (ctx.qry.page && !strcmp(ctx.qry.page, "blame"))
1093                         cgit_blame_link("blame", NULL, hc("blame"), ctx.qry.head,
1094                                         ctx.qry.oid, ctx.qry.vpath);
1095                 else
1096                         cgit_tree_link("tree", NULL, hc("tree"), ctx.qry.head,
1097                                        ctx.qry.oid, ctx.qry.vpath);
1098                 cgit_commit_link("commit", NULL, hc("commit"),
1099                                  ctx.qry.head, ctx.qry.oid, ctx.qry.vpath);
1100                 cgit_diff_link("diff", NULL, hc("diff"), ctx.qry.head,
1101                                ctx.qry.oid, ctx.qry.oid2, ctx.qry.vpath);
1102                 if (ctx.repo->max_stats)
1103                         cgit_stats_link("stats", NULL, hc("stats"),
1104                                         ctx.qry.head, ctx.qry.vpath);
1105                 if (ctx.repo->homepage) {
1106                         html("<a href='");
1107                         html_attr(ctx.repo->homepage);
1108                         html("'>homepage</a>");
1109                 }
1110                 html("</td><td class='form'>");
1111                 html("<form class='right' method='get' action='");
1112                 if (ctx.cfg.virtual_root) {
1113                         char *fileurl = cgit_fileurl(ctx.qry.repo, "log",
1114                                                    ctx.qry.vpath, NULL);
1115                         html_url_path(fileurl);
1116                         free(fileurl);
1117                 }
1118                 html("'>\n");
1119                 cgit_add_hidden_formfields(1, 0, "log");
1120                 html("<select name='qt'>\n");
1121                 html_option("grep", "log msg", ctx.qry.grep);
1122                 html_option("author", "author", ctx.qry.grep);
1123                 html_option("committer", "committer", ctx.qry.grep);
1124                 html_option("range", "range", ctx.qry.grep);
1125                 html("</select>\n");
1126                 html("<input class='txt' type='search' size='10' name='q' value='");
1127                 html_attr(ctx.qry.search);
1128                 html("'/>\n");
1129                 html("<input type='submit' value='search'/>\n");
1130                 html("</form>\n");
1131         } else if (ctx.env.authenticated) {
1132                 char *currenturl = cgit_currenturl();
1133                 site_link(NULL, "index", NULL, hc("repolist"), NULL, NULL, 0, 1);
1134                 if (ctx.cfg.root_readme)
1135                         site_link("about", "about", NULL, hc("about"),
1136                                   NULL, NULL, 0, 1);
1137                 html("</td><td class='form'>");
1138                 html("<form method='get' action='");
1139                 html_attr(currenturl);
1140                 html("'>\n");
1141                 html("<input type='search' name='q' size='10' value='");
1142                 html_attr(ctx.qry.search);
1143                 html("'/>\n");
1144                 html("<input type='submit' value='search'/>\n");
1145                 html("</form>");
1146                 free(currenturl);
1147         }
1148         html("</td></tr></table>\n");
1149         if (ctx.env.authenticated && ctx.repo && ctx.qry.vpath) {
1150                 html("<div class='path'>");
1151                 html("path: ");
1152                 cgit_print_path_crumbs(ctx.qry.vpath);
1153                 if (ctx.cfg.enable_follow_links && !strcmp(ctx.qry.page, "log")) {
1154                         html(" (");
1155                         ctx.qry.follow = !ctx.qry.follow;
1156                         cgit_self_link(ctx.qry.follow ? "follow" : "unfollow",
1157                                         NULL, NULL);
1158                         ctx.qry.follow = !ctx.qry.follow;
1159                         html(")");
1160                 }
1161                 html("</div>");
1162         }
1163         html("<div class='content'>");
1164 }
1165
1166 void cgit_print_filemode(unsigned short mode)
1167 {
1168         if (S_ISDIR(mode))
1169                 html("d");
1170         else if (S_ISLNK(mode))
1171                 html("l");
1172         else if (S_ISGITLINK(mode))
1173                 html("m");
1174         else
1175                 html("-");
1176         html_fileperm(mode >> 6);
1177         html_fileperm(mode >> 3);
1178         html_fileperm(mode);
1179 }
1180
1181 void cgit_compose_snapshot_prefix(struct strbuf *filename, const char *base,
1182                                   const char *ref)
1183 {
1184         struct object_id oid;
1185
1186         /*
1187          * Prettify snapshot names by stripping leading "v" or "V" if the tag
1188          * name starts with {v,V}[0-9] and the prettify mapping is injective,
1189          * i.e. each stripped tag can be inverted without ambiguities.
1190          */
1191         if (repo_get_oid(the_repository, fmt("refs/tags/%s", ref), &oid) == 0 &&
1192             (ref[0] == 'v' || ref[0] == 'V') && isdigit(ref[1]) &&
1193             ((repo_get_oid(the_repository, fmt("refs/tags/%s", ref + 1), &oid) == 0) +
1194              (repo_get_oid(the_repository, fmt("refs/tags/v%s", ref + 1), &oid) == 0) +
1195              (repo_get_oid(the_repository, fmt("refs/tags/V%s", ref + 1), &oid) == 0) == 1))
1196                 ref++;
1197
1198         strbuf_addf(filename, "%s-%s", base, ref);
1199 }
1200
1201 void cgit_print_snapshot_links(const struct cgit_repo *repo, const char *ref,
1202                                const char *separator)
1203 {
1204         const struct cgit_snapshot_format *f;
1205         struct strbuf filename = STRBUF_INIT;
1206         const char *basename;
1207         size_t prefixlen;
1208
1209         basename = cgit_snapshot_prefix(repo);
1210         if (starts_with(ref, basename))
1211                 strbuf_addstr(&filename, ref);
1212         else
1213                 cgit_compose_snapshot_prefix(&filename, basename, ref);
1214
1215         prefixlen = filename.len;
1216         for (f = cgit_snapshot_formats; f->suffix; f++) {
1217                 if (!(repo->snapshots & cgit_snapshot_format_bit(f)))
1218                         continue;
1219                 strbuf_setlen(&filename, prefixlen);
1220                 strbuf_addstr(&filename, f->suffix);
1221                 cgit_snapshot_link(filename.buf, NULL, NULL, NULL, NULL,
1222                                    filename.buf);
1223                 if (cgit_snapshot_get_sig(ref, f)) {
1224                         strbuf_addstr(&filename, ".asc");
1225                         html(" (");
1226                         cgit_snapshot_link("sig", NULL, NULL, NULL, NULL,
1227                                            filename.buf);
1228                         html(")");
1229                 } else if (starts_with(f->suffix, ".tar") && cgit_snapshot_get_sig(ref, &cgit_snapshot_formats[0])) {
1230                         strbuf_setlen(&filename, strlen(filename.buf) - strlen(f->suffix));
1231                         strbuf_addstr(&filename, ".tar.asc");
1232                         html(" (");
1233                         cgit_snapshot_link("sig", NULL, NULL, NULL, NULL,
1234                                            filename.buf);
1235                         html(")");
1236                 }
1237                 html(separator);
1238         }
1239         strbuf_release(&filename);
1240 }
1241
1242 void cgit_set_title_from_path(const char *path)
1243 {
1244         struct strbuf sb = STRBUF_INIT;
1245         const char *slash, *last_slash;
1246
1247         if (!path)
1248                 return;
1249
1250         for (last_slash = path + strlen(path); (slash = memrchr(path, '/', last_slash - path)) != NULL; last_slash = slash) {
1251                 strbuf_add(&sb, slash + 1, last_slash - slash - 1);
1252                 strbuf_addstr(&sb, " \xc2\xab ");
1253         }
1254         strbuf_add(&sb, path, last_slash - path);
1255         strbuf_addf(&sb, " - %s", ctx.page.title);
1256         ctx.page.title = strbuf_detach(&sb, NULL);
1257 }