-
Notifications
You must be signed in to change notification settings - Fork 154
/
http_rss.c
1332 lines (1118 loc) · 39.1 KB
/
http_rss.c
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
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* http_rss.c -- Routines for handling RSS feeds of mailboxes in httpd
*
* Copyright (c) 1994-2011 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <config.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <ctype.h>
#include <string.h>
#include <syslog.h>
#include <assert.h>
#include "acl.h"
#include "annotate.h"
#include "charset.h"
#include "global.h"
#include "httpd.h"
#include "http_err.h"
#include "http_proxy.h"
#include "imap_err.h"
#include "mailbox.h"
#include "map.h"
#include "mboxlist.h"
#include "message.h"
#include "parseaddr.h"
#include "proxy.h"
#include "times.h"
#include "seen.h"
#include "tok.h"
#include "util.h"
#include "version.h"
#include "wildmat.h"
#include "xmalloc.h"
#include "xstrlcpy.h"
#define XML_NS_ATOM "http://www.w3.org/2005/Atom"
#define GUID_URL_SCHEME "data:,"
#define MAX_SECTION_LEN 128
#define FEEDLIST_VAR "%RSS_FEEDLIST%"
static const char def_template[] =
HTML_DOCTYPE
"<html>\n<head>\n<title>Cyrus RSS Feeds</title>\n</head>\n"
"<body>\n<h2>Cyrus RSS Feeds</h2>\n"
FEEDLIST_VAR
"</body>\n</html>\n";
static time_t compile_time;
static void rss_init(struct buf *serverinfo);
static int meth_get(struct transaction_t *txn, void *params);
static int rss_parse_path(const char *path,
struct request_target_t *tgt, const char **errstr);
static int is_feed(const char *mbox);
static int list_feeds(struct transaction_t *txn);
static int fetch_message(struct transaction_t *txn, struct mailbox *mailbox,
unsigned recno, uint32_t uid,
struct index_record *record, struct body **body,
struct buf *msg_buf);
static int list_messages(struct transaction_t *txn, struct mailbox *mailbox);
static void display_message(struct transaction_t *txn,
const char *mboxname, const struct index_record *record,
struct body *body, const struct buf *msg_buf);
static void fetch_part(struct transaction_t *txn, struct body *body,
const char *findsection, const char *cursection,
struct buf *msg_buf);
/* Namespace for RSS feeds of mailboxes */
struct namespace_t namespace_rss = {
URL_NS_RSS, 0, "/rss", NULL, 1 /* auth */, ALLOW_READ,
/*mbtype*/0,
rss_init, NULL, NULL, NULL,
{
{ NULL, NULL }, /* ACL */
{ NULL, NULL }, /* COPY */
{ NULL, NULL }, /* DELETE */
{ &meth_get, NULL }, /* GET */
{ &meth_get, NULL }, /* HEAD */
{ NULL, NULL }, /* LOCK */
{ NULL, NULL }, /* MKCALENDAR */
{ NULL, NULL }, /* MKCOL */
{ NULL, NULL }, /* MOVE */
{ &meth_options, &rss_parse_path }, /* OPTIONS */
{ NULL, NULL }, /* POST */
{ NULL, NULL }, /* PROPFIND */
{ NULL, NULL }, /* PROPPATCH */
{ NULL, NULL }, /* PUT */
{ NULL, NULL }, /* REPORT */
{ &meth_trace, &rss_parse_path }, /* TRACE */
{ NULL, NULL } /* UNLOCK */
}
};
static void rss_init(struct buf *serverinfo __attribute__((unused)))
{
namespace_rss.enabled = config_httpmodules & IMAP_ENUM_HTTPMODULES_RSS;
if (!namespace_rss.enabled) return;
compile_time = calc_compile_time(__TIME__, __DATE__);
}
/* Perform a GET/HEAD request */
static int meth_get(struct transaction_t *txn,
void *params __attribute__((unused)))
{
int ret = 0, r, rights;
struct strlist *param;
char *section = NULL;
uint32_t uid = 0;
struct mailbox *mailbox = NULL;
/* Construct mailbox name corresponding to request target URI */
if ((r = rss_parse_path(txn->req_uri->path,
&txn->req_tgt, &txn->error.desc))) {
txn->error.desc = error_message(r);
return HTTP_NOT_FOUND;
}
/* If no mailboxname, list all available feeds */
if (!txn->req_tgt.mbentry) return list_feeds(txn);
/* Make sure its a mailbox that we are treating as an RSS feed */
if (!is_feed(txn->req_tgt.mbentry->name)) return HTTP_NOT_FOUND;
/* Check ACL for current user */
rights = txn->req_tgt.mbentry->acl ?
cyrus_acl_myrights(httpd_authstate, txn->req_tgt.mbentry->acl) : 0;
if (!(rights & ACL_READ)) return HTTP_NO_PRIVS;
if (txn->req_tgt.mbentry->server) {
/* Remote mailbox */
struct backend *be;
be = proxy_findserver(txn->req_tgt.mbentry->server,
&http_protocol, proxy_userid,
&backend_cached, NULL, NULL, httpd_in);
if (!be) return HTTP_UNAVAILABLE;
return http_pipe_req_resp(be, txn);
}
/* Local Mailbox */
/* Open mailbox for reading */
r = mailbox_open_irl(txn->req_tgt.mbentry->name, &mailbox);
if (r) {
syslog(LOG_ERR, "http_mailbox_open(%s) failed: %s",
txn->req_tgt.mbentry->name, error_message(r));
txn->error.desc = error_message(r);
switch (r) {
case IMAP_PERMISSION_DENIED: return HTTP_FORBIDDEN;
case IMAP_MAILBOX_NONEXISTENT: return HTTP_NOT_FOUND;
default: return HTTP_SERVER_ERROR;
}
}
/* Check query params, if any */
param = hash_lookup("uid", &txn->req_qparams);
if (param) {
uid = strtoul(param->s, NULL, 10);
if (!uid) uid = -1;
param = hash_lookup("section", &txn->req_qparams);
if (param) section = param->s;
}
/* If no UID specified, list messages as an RSS feed */
if (!uid) ret = list_messages(txn, mailbox);
else if (uid > mailbox->i.last_uid) {
txn->error.desc = "Message does not exist\r\n";
ret = HTTP_NOT_FOUND;
}
else {
struct index_record record;
struct buf msg_buf = BUF_INITIALIZER;
struct body *body = NULL;
/* Fetch the message */
if (!(ret = fetch_message(txn, mailbox, 0, uid,
&record, &body, &msg_buf))) {
int precond;
const char *etag = NULL;
time_t lastmod = 0;
struct resp_body_t *resp_body = &txn->resp_body;
/* Check any preconditions */
if (section && !strcmp(section, "0")) {
/* Entire raw message */
txn->flags.ranges = 1;
}
etag = message_guid_encode(&record.guid);
lastmod = record.internaldate;
precond = check_precond(txn, etag, lastmod);
switch (precond) {
case HTTP_OK:
case HTTP_PARTIAL:
case HTTP_NOT_MODIFIED:
/* Fill in ETag, Last-Modified, and Expires */
resp_body->etag = etag;
resp_body->lastmod = lastmod;
resp_body->maxage = 31536000; /* 1 year */
txn->flags.cc |= CC_MAXAGE;
if (precond != HTTP_NOT_MODIFIED) break;
default:
/* We failed a precondition - don't perform the request */
ret = precond;
goto done;
}
if (!section) {
/* Return entire message formatted as text/html */
display_message(txn, mailbox->name, &record, body, &msg_buf);
}
else if (!strcmp(section, "0")) {
/* Return entire message as text/plain */
resp_body->type = "text/plain";
write_body(precond, txn, buf_base(&msg_buf), buf_len(&msg_buf));
}
else {
/* Fetch, decode, and return the specified MIME message part */
fetch_part(txn, body, section, "1", &msg_buf);
}
done:
buf_free(&msg_buf);
if (body) {
message_free_body(body);
free(body);
}
}
}
mailbox_close(&mailbox);
return ret;
}
/* Create a mailbox name from the request URL */
static int rss_parse_path(const char *path, struct request_target_t *tgt,
const char **errstr)
{
const char *start, *end;
char mboxname[MAX_MAILBOX_BUFFER+1];
size_t len;
/* Clip off RSS prefix */
start = path + strlen(namespace_rss.prefix);
if (*start == '/') start++;
end = start + strlen(start);
if ((end > start) && (end[-1] == '/')) end--;
len = end - start;
if (len > MAX_MAILBOX_BUFFER) return IMAP_MAILBOX_BADNAME;
strncpy(mboxname, start, len);
mboxname[len] = '\0';
mboxname_hiersep_tointernal(&httpd_namespace, mboxname, len);
/* Locate the mailbox */
if (*mboxname) {
int r = http_mlookup(mboxname, &tgt->mbentry, NULL);
if (r) {
syslog(LOG_ERR, "mlookup(%s) failed: %s",
mboxname, error_message(r));
*errstr = error_message(r);
switch (r) {
case IMAP_PERMISSION_DENIED: return HTTP_FORBIDDEN;
case IMAP_MAILBOX_NONEXISTENT: return HTTP_NOT_FOUND;
default: return HTTP_SERVER_ERROR;
}
}
}
return 0;
}
/*
* Checks to make sure that the given mailbox is actually something
* that we're treating as an RSS feed. Returns 1 if yes, 0 if no.
*/
static int is_feed(const char *mbox)
{
static struct wildmat *feeds = NULL;
struct wildmat *wild;
if (!feeds) {
feeds = split_wildmats((char *) config_getstring(IMAPOPT_RSS_FEEDS),
NULL);
}
/* check mailbox against the 'rss_feeds' wildmat */
wild = feeds;
while (wild->pat && wildmat(mbox, wild->pat) != 1) wild++;
/* if we don't have a match, or its a negative match, don't use it */
if (!wild->pat || wild->not) return 0;
/* otherwise, its usable */
return 1;
}
/*
* mboxlist_findall() callback function to list RSS feeds as a tree
*/
struct node {
char name[MAX_MAILBOX_BUFFER];
size_t len;
struct node *parent;
struct node *child;
};
struct list_rock {
struct transaction_t *txn;
struct node *last;
};
static int list_cb(char *name, int matchlen, int maycreate, void *rock)
{
struct list_rock *lrock = (struct list_rock *) rock;
struct node *last = lrock->last;
struct buf *buf = &lrock->txn->resp_body.payload;
if (name) {
int rights;
mbentry_t *mbentry = NULL;
int r;
/* Don't list mailboxes that we don't treat as RSS feeds */
if (!is_feed(name)) return 0;
/* Don't list deleted mailboxes */
if (mboxname_isdeletedmailbox(name, NULL)) return 0;
/* Lookup the mailbox and make sure its readable */
r = http_mlookup(name, &mbentry, NULL);
if (r) return 0;
rights = httpd_myrights(httpd_authstate, mbentry->acl);
mboxlist_entry_free(&mbentry);
if ((rights & ACL_READ) != ACL_READ)
return 0;
}
if (name &&
!strncmp(name, last->name, last->len) &&
(!last->len || (name[last->len] == '.'))) {
/* Found closest ancestor of 'name' */
struct node *node;
size_t len = matchlen;
char shortname[MAX_MAILBOX_NAME+1], path[MAX_MAILBOX_PATH+1];
char *cp, *href = NULL;
/* Send a body chunk once in a while */
if (buf_len(buf) > PROT_BUFSIZE) {
write_body(0, lrock->txn, buf_cstring(buf), buf_len(buf));
buf_reset(buf);
}
if (last->child) {
/* Reuse our sibling */
buf_printf(buf, "</li>\n");
node = last->child;
}
else {
/* Create first child */
buf_printf(buf, "\n<ul%s>\n",
last->parent ? "" : " id='feed'"); /* needed by CSS */
node = xmalloc(sizeof(struct node));
}
/* See if we have a missing ancestor in the tree */
if ((cp = strchr(&name[last->len+1], '.'))) len = cp - name;
else href = path;
/* Populate new/updated node */
strncpy(node->name, name, len);
node->name[len] = '\0';
node->len = len;
node->parent = last;
node->child = NULL;
lrock->last = last->child = node;
/* Get last segment of mailbox name */
if ((cp = strrchr(node->name, '.'))) cp++;
else cp = node->name;
/* Translate short mailbox name to external form */
strlcpy(shortname, cp, sizeof(shortname));
mboxname_hiersep_toexternal(&httpd_namespace, shortname, 0);
if (href) {
/* Add selectable feed with link */
snprintf(path, sizeof(path), ".rss.%s", node->name);
mboxname_hiersep_toexternal(&httpd_namespace, href, 0);
buf_printf(buf, "<li><a href=\"%s\">%s</a>",
href, shortname);
}
else {
/* Add missing ancestor and recurse down the tree */
buf_printf(buf, "<li>%s", shortname);
list_cb(name, matchlen, maycreate, rock);
}
}
else {
/* Remove child */
if (last->child) {
buf_printf(buf, "</li>\n</ul>\n");
free(last->child);
last->child = NULL;
}
if (last->parent) {
/* Recurse back up the tree */
lrock->last = last->parent;
list_cb(name, matchlen, maycreate, rock);
}
}
return 0;
}
/* Create a HTML document listing all RSS feeds available to the user */
static int list_feeds(struct transaction_t *txn)
{
const char *template_file = config_getstring(IMAPOPT_RSS_FEEDLIST_TEMPLATE);
const char *var = NULL, *template = NULL, *prefix, *suffix;
size_t template_len = 0, prefix_len, suffix_len;
size_t varlen = strlen(FEEDLIST_VAR);
int fd = -1;
struct message_guid guid;
time_t lastmod;
char mboxlist[MAX_MAILBOX_PATH+1];
struct stat sbuf;
int ret = 0, precond;
struct buf *body = &txn->resp_body.payload;
struct list_rock lrock;
struct node root = { "", 0, NULL, NULL };
if (template_file) {
/* See if template exists and contains feedlist variable */
if (!stat(template_file, &sbuf) && S_ISREG(sbuf.st_mode) &&
(size_t) sbuf.st_size >= varlen &&
(fd = open(template_file, O_RDONLY)) != -1) {
const char *p;
unsigned long len;
map_refresh(fd, 1, &template, &template_len, sbuf.st_size,
template_file, NULL);
for (p = template, len = template_len;
len >= varlen && strncmp(p, FEEDLIST_VAR, varlen); p++, len--);
if (len >= varlen) {
var = p;
lastmod = sbuf.st_mtime;
}
else {
map_free(&template, &template_len);
close(fd);
fd = -1;
}
}
}
if (!var) {
/* No usable template specified, use our default */
template = def_template;
template_len = strlen(def_template);
var = strstr(template, FEEDLIST_VAR);
lastmod = compile_time;
}
prefix = template;
prefix_len = var - template;
suffix = template + prefix_len + varlen;
suffix_len = template_len - (prefix_len + varlen);
/* Begin to generate ETag */
message_guid_generate(&guid, template, template_len);
buf_setcstr(&txn->buf, message_guid_encode(&guid));
/* stat() mailboxes.db for Last-Modified and ETag */
snprintf(mboxlist, MAX_MAILBOX_PATH, "%s%s", config_dir, FNAME_MBOXLIST);
stat(mboxlist, &sbuf);
lastmod = MAX(lastmod, sbuf.st_mtime);
buf_printf(&txn->buf, "-%ld-%ld", sbuf.st_mtime, sbuf.st_size);
/* stat() imapd.conf for Last-Modified and ETag */
stat(config_filename, &sbuf);
lastmod = MAX(lastmod, sbuf.st_mtime);
buf_printf(&txn->buf, "-%ld-%ld", sbuf.st_mtime, sbuf.st_size);
/* Check any preconditions */
precond = check_precond(txn, buf_cstring(&txn->buf), lastmod);
switch (precond) {
case HTTP_OK:
case HTTP_NOT_MODIFIED:
/* Fill in ETag, Last-Modified, and Expires */
txn->resp_body.etag = buf_cstring(&txn->buf);
txn->resp_body.lastmod = lastmod;
txn->resp_body.maxage = 86400; /* 24 hrs */
txn->flags.cc |= CC_MAXAGE;
if (precond != HTTP_NOT_MODIFIED) break;
default:
/* We failed a precondition - don't perform the request */
ret = precond;
goto done;
}
/* Setup for chunked response */
txn->flags.te |= TE_CHUNKED;
txn->resp_body.type = "text/html; charset=utf-8";
/* Short-circuit for HEAD request */
if (txn->meth == METH_HEAD) {
response_header(HTTP_OK, txn);
goto done;
}
/* Send beginning of template */
write_body(HTTP_OK, txn, prefix, prefix_len);
/* Generate tree view of feeds */
buf_reset(body);
lrock.txn = txn;
lrock.last = &root;
mboxlist_findall(NULL, "*", httpd_userisadmin, NULL, httpd_authstate,
list_cb, &lrock);
/* Close out the tree */
list_cb(NULL, 0, 0, &lrock);
if (buf_len(body)) write_body(0, txn, buf_cstring(body), buf_len(body));
/* Send rest of template */
if (suffix_len) write_body(0, txn, suffix, suffix_len);
/* End of output */
write_body(0, txn, NULL, 0);
done:
if (fd != -1) {
map_free(&template, &template_len);
close(fd);
}
return ret;
}
/* Fetch the index record & bodystructure, and mmap the message */
static int fetch_message(struct transaction_t *txn, struct mailbox *mailbox,
unsigned recno, uint32_t uid,
struct index_record *record, struct body **body,
struct buf *msg_buf)
{
int r;
buf_reset(msg_buf);
/* Fetch index record for the message */
if (uid) r = mailbox_find_index_record(mailbox, uid, record, NULL);
else r = mailbox_read_index_record(mailbox, recno, record);
if ((r == CYRUSDB_NOTFOUND) ||
(record->system_flags & (FLAG_DELETED|FLAG_EXPUNGED))) {
txn->error.desc = "Message has been removed\r\n";
/* Fill in Expires */
txn->resp_body.maxage = 31536000; /* 1 year */
txn->flags.cc |= CC_MAXAGE;
return HTTP_GONE;
}
else if (r) {
syslog(LOG_ERR, "find index record failed");
txn->error.desc = error_message(r);
return HTTP_SERVER_ERROR;
}
/* Fetch cache record for the message */
if ((r = mailbox_cacherecord(mailbox, record))) {
syslog(LOG_ERR, "read cache failed");
txn->error.desc = error_message(r);
return HTTP_SERVER_ERROR;
}
/* Read message bodystructure */
message_read_bodystructure(record, body);
/* Map the message into memory */
mailbox_map_record(mailbox, record, msg_buf);
return 0;
}
static void buf_escapestr(struct buf *buf, const char *str, unsigned max,
unsigned replace, unsigned level)
{
const char *c;
unsigned buflen = buf_len(buf), len = 0;
if (!replace && config_httpprettytelemetry)
buf_printf(buf, "%*s", level * MARKUP_INDENT, "");
for (c = str; c && *c && (!max || len < max); c++, len++) {
/* Translate CR to HTML <br> tag */
if (*c == '\r') buf_appendcstr(buf, "<br>");
else if (*c == '\n' && !config_httpprettytelemetry) continue;
/* Translate XML/HTML specials */
else if (*c == '"') buf_appendcstr(buf, """);
// else if (*c == '\'') buf_appendcstr(buf, "'");
else if (*c == '&') buf_appendcstr(buf, "&");
else if (*c == '<') buf_appendcstr(buf, "<");
else if (*c == '>') buf_appendcstr(buf, ">");
/* Handle multi-byte UTF-8 sequences */
else if ((*c & 0xc0) == 0xc0) {
/* Code points larger than 127 are represented by
* multi-byte sequences, composed of a leading byte and
* one or more continuation bytes. The leading byte has
* two or more high-order 1s followed by a 0, while
* continuation bytes all have '10' in the high-order
* position. The number of high-order 1s in the leading
* byte of a multi-byte sequence indicates the number of
* bytes in the sequence.
*/
unsigned char lead = *c;
do buf_putc(buf, *c);
while (((lead <<= 1) & 0x80) && c++);
}
/* Check for non-printable chars */
else if (!(isspace(*c) || isprint(*c))) {
if (replace) {
/* Replace entire string with a warning */
buf_truncate(buf, buflen);
buf_printf_markup(buf, level++, "<blockquote>");
buf_printf_markup(buf, level, "<i><b>NOTE:</b> "
"This message contains characters "
"that can not be displayed in RSS</i>");
buf_printf_markup(buf, --level, "</blockquote>");
return;
}
else {
/* Translate non-printable chars to X */
buf_putc(buf, 'X');
}
}
else buf_putc(buf, *c);
}
if (!replace && config_httpprettytelemetry) buf_appendcstr(buf, "\n");
}
/* List messages as an RSS feed */
static int list_messages(struct transaction_t *txn, struct mailbox *mailbox)
{
const char *proto = NULL, *host = NULL;
uint32_t url_len, recno, recentuid = 0;
int max_age, max_items, max_len, nitems, precond;
time_t age_mark = 0, lastmod;
char datestr[80];
static char etag[33];
struct buf *url = &txn->buf;
struct buf *buf = &txn->resp_body.payload;
unsigned level = 0;
char mboxname[MAX_MAILBOX_NAME+1];
struct buf attrib = BUF_INITIALIZER;
/* Check any preconditions */
lastmod = mailbox->i.last_appenddate;
sprintf(etag, "%u-%u-%u",
mailbox->i.uidvalidity, mailbox->i.last_uid, mailbox->i.exists);
precond = check_precond(txn, etag, lastmod);
switch (precond) {
case HTTP_OK:
case HTTP_NOT_MODIFIED:
/* Fill in ETag, Last-Modified, and Expires */
txn->resp_body.etag = etag;
txn->resp_body.lastmod = lastmod;
txn->resp_body.maxage = 3600; /* 1 hr */
txn->flags.cc |= CC_MAXAGE;
if (precond != HTTP_NOT_MODIFIED) break;
default:
/* We failed a precondition - don't perform the request */
return precond;
}
/* Setup for chunked response */
txn->flags.te |= TE_CHUNKED;
txn->resp_body.type = "application/atom+xml; charset=utf-8";
/* Short-circuit for HEAD request */
if (txn->meth == METH_HEAD) {
response_header(HTTP_OK, txn);
return 0;
}
/* Get maximum age of items to display */
max_age = config_getint(IMAPOPT_RSS_MAXAGE);
if (max_age > 0) age_mark = time(0) - (max_age * 60 * 60 * 24);
/* Get number of items to display */
max_items = config_getint(IMAPOPT_RSS_MAXITEMS);
if (max_items < 0) max_items = 0;
/* Get length of description to display */
max_len = config_getint(IMAPOPT_RSS_MAXSYNOPSIS);
if (max_len < 0) max_len = 0;
#if 0
/* Obtain recentuid */
if (mailbox_internal_seen(mailbox, httpd_userid)) {
recentuid = mailbox->i.recentuid;
}
else if (httpd_userid) {
struct seen *seendb = NULL;
struct seendata sd;
r = seen_open(httpd_userid, SEEN_CREATE, &seendb);
if (!r) r = seen_read(seendb, mailbox->uniqueid, &sd);
seen_close(&seendb);
/* handle no seen DB gracefully */
if (r) {
recentuid = mailbox->i.last_uid;
syslog(LOG_ERR, "Could not open seen state for %s (%s)",
httpd_userid, error_message(r));
}
else {
recentuid = sd.lastuid;
free(sd.seenuids);
}
}
else {
recentuid = mailbox->i.last_uid; /* nothing is recent! */
}
#endif
/* Translate mailbox name to external form */
strlcpy(mboxname, mailbox->name, sizeof(mboxname));
mboxname_hiersep_toexternal(&httpd_namespace, mboxname, 0);
/* Construct base URL */
http_proto_host(txn->req_hdrs, &proto, &host);
assert(!buf_len(url));
buf_printf(url, "%s://%s%s", proto, host, txn->req_uri->path);
url_len = buf_len(url);
/* Start XML */
buf_reset(buf);
buf_printf_markup(buf, level, XML_DECLARATION);
/* Set up the Atom <feed> response for the mailbox */
buf_printf_markup(buf, level++,
"<feed xmlns=\"" XML_NS_ATOM "\">");
/* <title> - required */
buf_printf_markup(buf, level, "<title>%s</title>", mboxname);
/* <id> - required */
buf_printf_markup(buf, level, "<id>%s%s</id>",
GUID_URL_SCHEME, mailbox->uniqueid);
/* <updated> - required */
time_to_rfc3339(lastmod, datestr, sizeof(datestr));
buf_printf_markup(buf, level, "<updated>%s</updated>", datestr);
/* <author> - required (use 'Anonymous' as default <name>) */
buf_printf_markup(buf, level++, "<author>");
buf_printf_markup(buf, level, "<name>Anonymous</name>");
buf_printf_markup(buf, --level, "</author>");
/* <subtitle> - optional */
annotatemore_lookup(mailbox->name, "/comment", NULL, &attrib);
if (age_mark) {
time_to_rfc822(age_mark, datestr, sizeof(datestr));
buf_printf_markup(buf, level,
"<subtitle>%s [posts since %s]</subtitle>",
buf_cstring(&attrib), datestr);
}
else {
buf_printf_markup(buf, level,
"<subtitle>%s [%u most recent posts]</subtitle>",
buf_cstring(&attrib),
max_items ? (unsigned) max_items : mailbox->i.exists);
}
buf_free(&attrib);
/* <link> - optional */
buf_printf_markup(buf, level,
"<link rel=\"self\" type=\"application/atom+xml\""
" href=\"%s\"/>", buf_cstring(url));
/* <generator> - optional */
if (config_serverinfo == IMAP_ENUM_SERVERINFO_ON) {
buf_printf_markup(buf, level, "<generator>Cyrus HTTP %s</generator>",
cyrus_version());
}
write_body(HTTP_OK, txn, buf_cstring(buf), buf_len(buf));
buf_reset(buf);
/* Add an <entry> for each message */
for (recno = mailbox->i.num_records, nitems = 0;
recno >= 1 && (!max_items || nitems < max_items); recno--) {
struct index_record record;
struct buf msg_buf = BUF_INITIALIZER;
struct body *body = NULL;
char *subj;
struct address *addr = NULL;
const char *content_types[] = { "text", NULL };
struct message_content content;
struct bodypart **parts;
/* Send a body chunk once in a while */
if (buf_len(buf) > PROT_BUFSIZE) {
write_body(0, txn, buf_cstring(buf), buf_len(buf));
buf_reset(buf);
}
/* Fetch the message */
if (fetch_message(txn, mailbox, recno, 0,
&record, &body, &msg_buf)) {
continue;
}
/* XXX Are we going to do anything with \Recent? */
if (record.uid <= recentuid) {
syslog(LOG_DEBUG, "recno %u not recent (%u/%u)",
recno, record.uid, recentuid);
continue;
}
/* Make sure the message is new enough */
if (record.gmtime < age_mark) continue;
/* Feeding this message, increment counter */
nitems++;
buf_printf_markup(buf, level++, "<entry>");
/* <title> - required */
subj = charset_parse_mimeheader(body->subject);
buf_printf_markup(buf, level++, "<title type=\"html\">");
buf_escapestr(buf, subj && *subj ? subj : "[Untitled]", 0, 0, level);
buf_printf_markup(buf, --level, "</title>");
free(subj);
/* <id> - required */
buf_printf_markup(buf, level, "<id>%s%s</id>",
GUID_URL_SCHEME, message_guid_encode(&record.guid));
/* <updated> - required */
time_to_rfc3339(record.gmtime, datestr, sizeof(datestr));
buf_printf_markup(buf, level, "<updated>%s</updated>", datestr);
/* <published> - optional */
buf_printf_markup(buf, level, "<published>%s</published>", datestr);
/* <link> - optional */
buf_truncate(url, url_len);
buf_printf(url, "?uid=%u", record.uid);
buf_printf_markup(buf, level, "<link rel=\"alternate\""
" type=\"text/html\" href=\"%s\"/>",
buf_cstring(url));
/* <author> - optional */
addr = body->from;
if (!addr) addr = body->sender;
if (addr && *addr->mailbox) {
buf_printf_markup(buf, level++, "<author>");
/* <name> - required */
if (addr->name) {
char *name = charset_parse_mimeheader(addr->name);
buf_printf_markup(buf, level++, "<name>");
buf_escapestr(buf, name, 0, 0, level);
buf_printf_markup(buf, --level, "</name>");
free(name);
}
else {
buf_printf_markup(buf, level, "<name>%s@%s</name>",
addr->mailbox, addr->domain);
}
/* <email> - optional */
buf_printf_markup(buf, level, "<email>%s@%s</email>",
addr->mailbox, addr->domain);
buf_printf_markup(buf, --level, "</author>");
}
/* <summary> - optional (find and use the first text/ part) */
content.base = buf_base(&msg_buf);
content.len = buf_len(&msg_buf);
content.body = body;
message_fetch_part(&content, content_types, &parts);
if (parts && *parts) {
buf_printf_markup(buf, level++, "<summary type=\"html\">");
buf_printf_markup(buf, level++, "<![CDATA[");
buf_escapestr(buf, parts[0]->decoded_body, max_len, 1, level);
buf_printf_markup(buf, --level, "]]>");
buf_printf_markup(buf, --level, "</summary>");
}
buf_printf_markup(buf, --level, "</entry>");
/* free the results */
if (parts) {
struct bodypart **p;
for (p = parts; *p; p++) free(*p);
free(parts);
}
if (body) {
message_free_body(body);
free(body);
}
buf_free(&msg_buf);
}
/* End of Atom <feed> */
buf_printf_markup(buf, --level, "</feed>");
write_body(0, txn, buf_cstring(buf), buf_len(buf));
/* End of output */
write_body(0, txn, NULL, 0);
return 0;