2.91
activitypub.c
1/* snac - A simple, minimalistic ActivityPub instance */
2/* copyright (c) 2022 - 2026 grunfink et al. / MIT license */
3
4#include "xs.h"
5#include "xs_json.h"
6#include "xs_curl.h"
7#include "xs_url.h"
8#include "xs_mime.h"
9#include "xs_openssl.h"
10#include "xs_regex.h"
11#include "xs_time.h"
12#include "xs_set.h"
13#include "xs_match.h"
14#include "xs_unicode.h"
15#include "xs_webmention.h"
16#include "xs_http.h"
17
18#include "snac.h"
19
20#include <stddef.h>
21#include <sys/wait.h>
22
23const char * const public_address = "https:/" "/www.w3.org/ns/activitystreams#Public";
24
25/* susie.png */
26
27const char * const susie =
28 "iVBORw0KGgoAAAANSUhEUgAAAEAAAABAAQAAAAC"
29 "CEkxzAAAAUUlEQVQoz43R0QkAMQwCUDdw/y3dwE"
30 "vsvzlL4X1IoQkAisKmwfAFT3RgJHbQezpSRoXEq"
31 "eqCL9BJBf7h3QbOCCxV5EVWMEMwG7K1/WODtlvx"
32 "AYTtEsDU9F34AAAAAElFTkSuQmCC";
33
34const char * const susie_cool =
35 "iVBORw0KGgoAAAANSUhEUgAAAEAAAABAAQAAAAC"
36 "CEkxzAAAAV0lEQVQoz43RwQ3AMAwCQDZg/y3ZgN"
37 "qo3+JaedwDOUQBQFHYaTB8wTM6sGl2cMPu+DFzn"
38 "+ZcgN7wF7ZVihXkfSlWIVzIA6dbQzaygllpNuTX"
39 "ZmmFNlvxADX1+o0cUPMbAAAAAElFTkSuQmCC";
40
41const char * const susie_muertos =
42 "iVBORw0KGgoAAAANSUhEUgAAAEAAAABAAQAAAAC"
43 "CEkxzAAAAV0lEQVQoz4XQsQ0AMQxCUW/A/lv+DT"
44 "ic6zGRolekIMyMELNp8PiCEw6Q4w4NoAt53IH5m"
45 "xXksrZYgZwJrIox+Z8vJAfe2lCxG6AK7eKkWcEb"
46 "QHbF617xAQatAAD7jJHUAAAAAElFTkSuQmCC";
47
48
49const char *default_avatar_base64(void)
50/* returns the default avatar in base64 */
51{
52 time_t t = time(NULL);
53 struct tm tm;
54 const char *p = susie;
55
56 gmtime_r(&t, &tm);
57
58 if (tm.tm_mon == 10 && tm.tm_mday == 2)
59 p = susie_muertos;
60 else
61 if (tm.tm_wday == 0 || tm.tm_wday == 6)
62 p = susie_cool;
63
64 return p;
65}
66
67
68int activitypub_request(snac *user, const char *url, xs_dict **data)
69/* request an object */
70{
71 int status = 0;
72 xs *response = NULL;
73 xs *payload = NULL;
74 int p_size;
75 const char *ctype;
76
77 *data = NULL;
78
79 if (user != NULL) {
80 /* get from the net */
81 response = http_signed_request(user, "GET", url,
82 NULL, NULL, 0, &status, &payload, &p_size, 0);
83 }
84
85 if (status == 0 || (status >= 500 && status <= 599)) {
86 /* I found an instance running Misskey that returned
87 500 on signed messages but returned the object
88 perfectly without signing (?), so why not try */
89 xs_free(response);
90
91 xs *hdrs = xs_dict_new();
92 hdrs = xs_dict_append(hdrs, "accept", "application/activity+json");
93 hdrs = xs_dict_append(hdrs, "user-agent", USER_AGENT);
94
95 response = xs_http_request("GET", url, hdrs,
96 NULL, 0, &status, &payload, &p_size, 0);
97 }
98
99 if (valid_status(status)) {
100 /* ensure it's ActivityPub data */
101 ctype = xs_dict_get(response, "content-type");
102
103 if (xs_is_null(ctype))
104 status = HTTP_STATUS_BAD_REQUEST;
105 else
106 if (xs_str_in(ctype, "application/activity+json") != -1 ||
107 xs_str_in(ctype, "application/ld+json") != -1) {
108
109 /* if there is no payload, fail */
110 if (xs_is_null(payload))
111 status = HTTP_STATUS_BAD_REQUEST;
112 else
113 *data = xs_json_loads(payload);
114 }
115 else
116 status = HTTP_STATUS_INTERNAL_SERVER_ERROR;
117 }
118
119 return status;
120}
121
122
123static xs_dict *actor_get_collections(snac *user, xs_dict *actor, int throttle)
124/* fetches follower/following/statuses counts from an actor's collections and adds them to the actor object */
125{
126 /* only fetch if counts are not already present in the actor object */
127 const xs_number *existing_followers = xs_dict_get(actor, "followers_count");
128 const xs_number *existing_following = xs_dict_get(actor, "following_count");
129 const xs_number *existing_statuses = xs_dict_get(actor, "statuses_count");
130
131 /* skip if we already have all counts */
132 if (xs_type(existing_followers) == XSTYPE_NUMBER &&
133 xs_type(existing_following) == XSTYPE_NUMBER &&
134 xs_type(existing_statuses) == XSTYPE_NUMBER) {
135 return actor;
136 }
137
138 /* CRITICAL: duplicate URLs BEFORE any xs_dict_set calls, as xs_dict_set can reallocate the dict */
139 xs *followers_url = xs_dup(xs_dict_get(actor, "followers"));
140 xs *following_url = xs_dup(xs_dict_get(actor, "following"));
141 xs *outbox_url = xs_dup(xs_dict_get(actor, "outbox"));
142
143 /* only fetch followers count if not already present */
144 if (xs_type(existing_followers) != XSTYPE_NUMBER && !xs_is_null(followers_url)) {
145 xs *followers_coll = NULL;
146 if (valid_status(activitypub_request(user, followers_url, &followers_coll))) {
147 const xs_number *total = xs_dict_get(followers_coll, "totalItems");
148 if (xs_type(total) == XSTYPE_NUMBER) {
149 xs *total_copy = xs_dup(total);
150 actor = xs_dict_set(actor, "followers_count", total_copy);
151 }
152 }
153 /* throttle to prevent resource exhaustion on low-power devices */
154 if (throttle)
155 usleep(100000); /* 100ms delay between requests */
156 }
157
158 /* only fetch following count if not already present */
159 if (xs_type(existing_following) != XSTYPE_NUMBER && !xs_is_null(following_url)) {
160 xs *following_coll = NULL;
161 if (valid_status(activitypub_request(user, following_url, &following_coll))) {
162 const xs_number *total = xs_dict_get(following_coll, "totalItems");
163 if (xs_type(total) == XSTYPE_NUMBER) {
164 xs *total_copy = xs_dup(total);
165 actor = xs_dict_set(actor, "following_count", total_copy);
166 }
167 }
168 /* throttle to prevent resource exhaustion on low-power devices */
169 if (throttle)
170 usleep(100000); /* 100ms delay between requests */
171 }
172
173 /* only fetch statuses count if not already present */
174 if (xs_type(existing_statuses) != XSTYPE_NUMBER && !xs_is_null(outbox_url)) {
175 xs *outbox_coll = NULL;
176 if (valid_status(activitypub_request(user, outbox_url, &outbox_coll))) {
177 const xs_number *total = xs_dict_get(outbox_coll, "totalItems");
178 if (xs_type(total) == XSTYPE_NUMBER) {
179 xs *total_copy = xs_dup(total);
180 actor = xs_dict_set(actor, "statuses_count", total_copy);
181 }
182 }
183 /* throttle to prevent resource exhaustion on low-power devices */
184 if (throttle)
185 usleep(100000); /* 100ms delay between requests */
186 }
187
188 return actor;
189}
190
191
192int actor_request(snac *user, const char *actor, xs_dict **data)
193/* request an actor */
194{
195 int status;
196 xs *payload = NULL;
197
198 if (data)
199 *data = NULL;
200
201 /* get from disk first */
202 status = actor_get_refresh(user, actor, data);
203
204 if (!valid_status(status)) {
205 /* actor data non-existent: get from the net */
206 status = activitypub_request(user, actor, &payload);
207
208 if (valid_status(status)) {
209 /* fetch collection counts when initially fetching an actor (no throttle) */
210 payload = actor_get_collections(user, payload, 0);
211
212 /* renew data */
213 status = actor_add(actor, payload);
214
215 if (data != NULL) {
216 *data = payload;
217 payload = NULL;
218 }
219 }
220 else
221 srv_debug(1, xs_fmt("actor_request error %s %d", actor, status));
222 }
223
224 /* collect the (presumed) shared inbox in this actor */
225 if (xs_type(xs_dict_get(srv_config, "disable_inbox_collection")) != XSTYPE_TRUE) {
226 if (valid_status(status) && data && *data)
227 inbox_add_by_actor(*data);
228 }
229
230 return status;
231}
232
233
234const char *get_atto(const xs_dict *msg)
235/* gets the attributedTo field (an actor) */
236{
237 const xs_val *actor = xs_dict_get(msg, "attributedTo");
238
239 /* if the actor is a list of objects (like on Peertube videos), pick the Person */
240 if (xs_type(actor) == XSTYPE_LIST) {
241 const xs_list *p = actor;
242 int c = 0;
243 const xs_dict *v;
244 actor = NULL;
245
246 while (actor == NULL && xs_list_next(p, &v, &c)) {
247 if (xs_type(v) == XSTYPE_DICT) {
248 const char *type = xs_dict_get(v, "type");
249 if (xs_type(type) == XSTYPE_STRING && strcmp(type, "Person") == 0) {
250 actor = xs_dict_get(v, "id");
251
252 if (xs_type(actor) != XSTYPE_STRING)
253 actor = NULL;
254 }
255 }
256 }
257 }
258 else
259 if (xs_type(actor) == XSTYPE_DICT) {
260 /* bandwagon.fm returns this */
261 actor = xs_dict_get(actor, "id");
262 }
263
264 return actor;
265}
266
267
268const char *get_in_reply_to(const xs_dict *msg)
269/* gets the inReplyTo id */
270{
271 const xs_val *in_reply_to = xs_dict_get(msg, "inReplyTo");
272
273 if (xs_type(in_reply_to) == XSTYPE_DICT)
274 in_reply_to = xs_dict_get(in_reply_to, "id");
275
276 return in_reply_to;
277}
278
279
280xs_list *get_attachments(const xs_dict *msg)
281/* unify the garbage fire that are the attachments */
282{
283 xs_list *l = xs_list_new();
284 const xs_list *p;
285
286 /* try first the attachments list */
287 if (!xs_is_null(p = xs_dict_get(msg, "attachment"))) {
288 xs *attach = NULL;
289 const xs_val *v;
290
291 /* ensure it's a list */
292 if (xs_type(p) == XSTYPE_DICT) {
293 attach = xs_list_new();
294 attach = xs_list_append(attach, p);
295 }
296 else
297 attach = xs_dup(p);
298
299 if (xs_type(attach) == XSTYPE_LIST && xs_list_len(attach) == 0) {
300 /* does the message have an image? */
301 const xs_dict *d = xs_dict_get(msg, "image");
302 if (xs_type(d) == XSTYPE_DICT) {
303 /* add it to the attachment list */
304 attach = xs_list_append(attach, d);
305 }
306 }
307
308 /* now iterate the list */
309 int c = 0;
310 while (xs_list_next(attach, &v, &c)) {
311 const char *type = xs_dict_get(v, "mediaType");
312 if (xs_is_null(type))
313 type = xs_dict_get(v, "type");
314
315 if (xs_is_null(type))
316 continue;
317
318 const char *href = xs_dict_get(v, "url");
319 if (xs_is_null(href))
320 href = xs_dict_get(v, "href");
321 if (xs_is_null(href))
322 continue;
323
324 /* infer MIME type from non-specific attachments */
325 if (xs_list_len(attach) < 2 && xs_match(type, "Link|Document")) {
326 char *mt = (char *)xs_mime_by_ext(href);
327
328 if (xs_match(mt, "image/*|audio/*|video/*")) /* */
329 type = mt;
330 }
331
332 const char *name = xs_dict_get(v, "name");
333 if (xs_is_null(name))
334 name = xs_dict_get(msg, "name");
335 if (xs_is_null(name))
336 name = "";
337
338 xs *d = xs_dict_new();
339 d = xs_dict_append(d, "type", type);
340 d = xs_dict_append(d, "href", href);
341 d = xs_dict_append(d, "name", name);
342
343 const xs_dict *icon = xs_dict_get(v, "icon");
344 if (xs_type(icon) == XSTYPE_DICT)
345 d = xs_dict_append(d, "icon", icon);
346
347 l = xs_list_append(l, d);
348 }
349 }
350
351 /** urls (attachments from Peertube) **/
352 p = xs_dict_get(msg, "url");
353
354 if (xs_type(p) == XSTYPE_LIST) {
355 const char *href = NULL;
356 const char *type = NULL;
357 int c = 0;
358 const xs_val *v;
359
360 while (href == NULL && xs_list_next(p, &v, &c)) {
361 if (xs_type(v) == XSTYPE_DICT) {
362 const char *mtype = xs_dict_get(v, "type");
363
364 if (xs_type(mtype) == XSTYPE_STRING && strcmp(mtype, "Link") == 0) {
365 mtype = xs_dict_get(v, "mediaType");
366 const xs_list *tag = xs_dict_get(v, "tag");
367
368 if (xs_type(mtype) == XSTYPE_STRING &&
369 strcmp(mtype, "application/x-mpegURL") == 0 &&
370 xs_type(tag) == XSTYPE_LIST) {
371 /* now iterate the tag list, looking for a video URL */
372 const xs_dict *d;
373 int c = 0;
374
375 while (href == NULL && xs_list_next(tag, &d, &c)) {
376 if (xs_type(d) == XSTYPE_DICT) {
377 if (xs_type(mtype = xs_dict_get(d, "mediaType")) == XSTYPE_STRING &&
378 xs_startswith(mtype, "video/")) {
379 const char *h = xs_dict_get(d, "href");
380
381 /* this is probably it */
382 if (xs_type(h) == XSTYPE_STRING) {
383 href = h;
384 type = mtype;
385 }
386 }
387 }
388 }
389 }
390 }
391 }
392 }
393
394 if (href && type) {
395 xs *d = xs_dict_new();
396 d = xs_dict_append(d, "href", href);
397 d = xs_dict_append(d, "type", type);
398 d = xs_dict_append(d, "name", "---");
399
400 l = xs_list_append(l, d);
401 }
402 }
403
404 return l;
405}
406
407
408int hashtag_in_msg(const xs_list *hashtags, const xs_dict *msg)
409/* returns 1 if the message contains any of the list of hashtags */
410{
411 if (xs_is_list(hashtags) && xs_is_dict(msg)) {
412 const xs_list *tags_in_msg = xs_dict_get(msg, "tag");
413
414 if (xs_is_list(tags_in_msg)) {
415 const xs_dict *te;
416
417 /* iterate the tags in the message */
418 xs_list_foreach(tags_in_msg, te) {
419 if (xs_is_dict(te)) {
420 const char *type = xs_dict_get(te, "type");
421 const char *name = xs_dict_get(te, "name");
422
423 if (xs_is_string(type) && xs_is_string(name)) {
424 if (strcmp(type, "Hashtag") == 0) {
425 xs *lc_name = xs_utf8_to_lower(name);
426
427 if (xs_list_in(hashtags, lc_name) != -1)
428 return 1;
429 }
430 }
431 }
432 }
433 }
434 }
435
436 return 0;
437}
438
439
440int followed_hashtag_check(snac *user, const xs_dict *msg)
441/* returns 1 if this message contains a hashtag followed by me */
442{
443 return hashtag_in_msg(xs_dict_get(user->config, "followed_hashtags"), msg);
444}
445
446
447int blocked_hashtag_check(snac *user, const xs_dict *msg)
448/* returns 1 if this message contains a hashtag blocked by me */
449{
450 return hashtag_in_msg(xs_dict_get(user->config, "blocked_hashtags"), msg);
451}
452
453
454int timeline_request(snac *snac, const char **id, xs_str **wrk, int level)
455/* ensures that an entry and its ancestors are in the timeline */
456{
457 int status = 0;
458
459 if (level < MAX_CONVERSATION_LEVELS && !xs_is_null(*id)) {
460 xs *msg = NULL;
461
462 /* from a blocked instance? discard and break */
463 if (is_instance_blocked(*id)) {
464 snac_debug(snac, 1, xs_fmt("timeline_request blocked instance %s", *id));
465 return status;
466 }
467
468 /* is the object already there? */
469 if (!valid_status((status = object_get(*id, &msg)))) {
470 /* no; download it */
471 status = activitypub_request(snac, *id, &msg);
472 }
473
474 if (valid_status(status)) {
475 const xs_dict *object = msg;
476 const char *type = xs_dict_get(object, "type");
477
478 /* get the id again from the object, as it may be different */
479 const char *nid = xs_dict_get(object, "id");
480
481 if (xs_type(nid) != XSTYPE_STRING)
482 return 0;
483
484 if (wrk && strcmp(nid, *id) != 0) {
485 snac_debug(snac, 1,
486 xs_fmt("timeline_request canonical id for %s is %s", *id, nid));
487
488 *wrk = xs_dup(nid);
489 *id = *wrk;
490 }
491
492 if (xs_is_null(type))
493 type = "(null)";
494
495 srv_debug(2, xs_fmt("timeline_request type %s '%s'", nid, type));
496
497 if (strcmp(type, "Create") == 0) {
498 /* some software like lemmy nest Announce + Create + Note */
499 if (!xs_is_null(object = xs_dict_get(object, "object"))) {
500 type = xs_dict_get(object, "type");
501 nid = xs_dict_get(object, "id");
502 }
503 else
504 type = "(null)";
505 }
506
507 if (xs_match(type, POSTLIKE_OBJECT_TYPE)) {
508 if (content_match("filter_reject.txt", object))
509 snac_log(snac, xs_fmt("timeline_request rejected by content %s", nid));
510 else
511 if (blocked_hashtag_check(snac, object))
512 snac_log(snac, xs_fmt("timeline_request rejected by hashtag %s", nid));
513 else {
514 const char *actor = get_atto(object);
515
516 if (!xs_is_null(actor)) {
517 /* request (and drop) the actor for this entry */
518 if (!valid_status(actor_request(snac, actor, NULL))) {
519 /* failed? retry later */
520 enqueue_actor_refresh(snac, actor, 60);
521 }
522
523 /* does it have an ancestor? */
524 const char *in_reply_to = get_in_reply_to(object);
525
526 /* store */
527 timeline_add(snac, nid, object);
528
529 /* redistribute to lists for this user */
530 list_distribute(snac, actor, object);
531
532 /* recurse! */
533 timeline_request(snac, &in_reply_to, NULL, level + 1);
534 }
535 }
536 }
537 }
538 }
539
540 return status;
541}
542
543
544int send_to_inbox_raw(const char *keyid, const char *seckey,
545 const xs_str *inbox, const xs_dict *msg,
546 xs_val **payload, int *p_size, int timeout)
547/* sends a message to an Inbox */
548{
549 int status;
550 xs_dict *response;
551 xs *j_msg = xs_json_dumps((xs_dict *)msg, 4);
552
553 response = http_signed_request_raw(keyid, seckey, "POST", inbox,
554 NULL, j_msg, strlen(j_msg), &status, payload, p_size, timeout);
555
556 xs_free(response);
557
558 return status;
559}
560
561
562int send_to_inbox(snac *snac, const xs_str *inbox, const xs_dict *msg,
563 xs_val **payload, int *p_size, int timeout)
564/* sends a message to an Inbox */
565{
566 const char *seckey = xs_dict_get(snac->key, "secret");
567
568 return send_to_inbox_raw(snac->actor, seckey, inbox, msg, payload, p_size, timeout);
569}
570
571
572xs_str *get_actor_inbox(const char *actor, int shared)
573/* gets an actor's inbox */
574{
575 xs *data = NULL;
576 const char *v = NULL;
577
578 if (valid_status(actor_request(NULL, actor, &data))) {
579 /* try first endpoints/sharedInbox */
580 if (shared && (v = xs_dict_get(data, "endpoints")))
581 v = xs_dict_get(v, "sharedInbox");
582
583 /* try then the regular inbox */
584 if (xs_is_null(v))
585 v = xs_dict_get(data, "inbox");
586 }
587
588 return xs_is_null(v) ? NULL : xs_dup(v);
589}
590
591
592int send_to_actor(snac *snac, const char *actor, const xs_dict *msg,
593 xs_val **payload, int *p_size, int timeout)
594/* sends a message to an actor */
595{
596 int status = HTTP_STATUS_BAD_REQUEST;
597 xs *inbox = get_actor_inbox(actor, 1);
598
599 if (!xs_is_null(inbox))
600 status = send_to_inbox(snac, inbox, msg, payload, p_size, timeout);
601
602 return status;
603}
604
605
606void post_message(snac *snac, const char *actor, const xs_dict *msg)
607/* posts a message immediately (bypassing the output queues) */
608{
609 xs *payload = NULL;
610 int p_size;
611
612 int status = send_to_actor(snac, actor, msg, &payload, &p_size, 3);
613
614 srv_log(xs_fmt("post_message to actor %s %d", actor, status));
615
616 if (!valid_status(status))
617 /* cannot send right now, enqueue */
618 enqueue_message(snac, msg);
619}
620
621
622xs_list *recipient_list(snac *snac, const xs_dict *msg, int expand_public)
623/* returns the list of recipients for a message */
624{
625 const xs_val *to = xs_dict_get(msg, "to");
626 const xs_val *cc = xs_dict_get(msg, "cc");
627 xs_set rcpts;
628 int n;
629
630 xs_set_init(&rcpts);
631
632 const xs_list *lists[] = { to, cc, NULL };
633 for (n = 0; lists[n]; n++) {
634 xs_list *l = (xs_list *)lists[n];
635 const char *v;
636 xs *tl = NULL;
637
638 /* if it's a string, create a list with only one element */
639 if (xs_type(l) == XSTYPE_STRING) {
640 tl = xs_list_new();
641 tl = xs_list_append(tl, l);
642
643 l = tl;
644 }
645
646 while (xs_list_iter(&l, &v)) {
647 if (expand_public) {
648 xs *followers_url = xs_fmt("%s/followers", snac->actor);
649 if (strcmp(v, public_address) == 0 ||
650 /* check if it's a followers collection URL */
651 (xs_type(v) == XSTYPE_STRING &&
652 strcmp(v, followers_url) == 0) ||
653 (xs_type(v) == XSTYPE_LIST &&
654 xs_list_in(v, followers_url) != -1)) {
655 /* iterate the followers and add them */
656 xs *fwers = follower_list(snac);
657 const char *actor;
658
659 char *p = fwers;
660 while (xs_list_iter(&p, &actor))
661 xs_set_add(&rcpts, actor);
662 }
663 else
664 xs_set_add(&rcpts, v);
665 }
666 else
667 xs_set_add(&rcpts, v);
668 }
669 }
670
671 return xs_set_result(&rcpts);
672}
673
674
675int is_msg_public(const xs_dict *msg)
676/* checks if a message is public */
677{
678 const char *to = xs_dict_get(msg, "to");
679 const char *cc = xs_dict_get(msg, "cc");
680 int n;
681
682 const char *lists[] = { to, cc, NULL };
683 for (n = 0; lists[n]; n++) {
684 const xs_val *l = lists[n];
685
686 if (xs_type(l) == XSTYPE_STRING) {
687 if (strcmp(l, public_address) == 0)
688 return 1;
689 }
690 else
691 if (xs_type(l) == XSTYPE_LIST) {
692 if (xs_list_in(l, public_address) != -1)
693 return 1;
694 }
695 }
696
697 return 0;
698}
699
700
701int is_msg_from_private_user(const xs_dict *msg)
702/* checks if a message is from a local, private user */
703{
704 int ret = 0;
705
706 /* is this message from a local user? */
707 if (xs_startswith(xs_dict_get(msg, "id"), srv_baseurl)) {
708 const char *atto = get_atto(msg);
709 xs *l = xs_split(atto, "/");
710 const char *uid = xs_list_get(l, -1);
711 snac user;
712
713 if (uid && user_open(&user, uid)) {
714 if (xs_type(xs_dict_get(user.config, "private")) == XSTYPE_TRUE)
715 ret = 1;
716
717 user_free(&user);
718 }
719 }
720
721 return ret;
722}
723
724
725void followed_hashtag_distribute(const xs_dict *msg)
726/* distribute this post to all users following the included hashtags */
727{
728 const char *id = xs_dict_get(msg, "id");
729 const xs_list *tags_in_msg = xs_dict_get(msg, "tag");
730
731 if (!xs_is_string(id) || !xs_is_list(tags_in_msg) || xs_list_len(tags_in_msg) == 0)
732 return;
733
734 srv_debug(1, xs_fmt("followed_hashtag_distribute check for %s", id));
735
736 xs *users = user_list();
737 const char *uid;
738
739 xs_list_foreach(users, uid) {
740 snac user;
741
742 if (user_open(&user, uid)) {
743 if (followed_hashtag_check(&user, msg)) {
744 timeline_add(&user, id, msg);
745
746 snac_log(&user, xs_fmt("followed hashtag in %s", id));
747 }
748
749 user_free(&user);
750 }
751 }
752}
753
754
755int is_msg_for_me(snac *snac, const xs_dict *c_msg)
756/* checks if this message is for me */
757{
758 const char *type = xs_dict_get(c_msg, "type");
759 const char *actor = xs_dict_get(c_msg, "actor");
760
761 if (strcmp(actor, snac->actor) == 0) {
762 /* message by myself? (most probably via the shared-inbox) reject */
763 snac_debug(snac, 1, xs_fmt("ignoring message by myself"));
764 return 0;
765 }
766
767 if (xs_match(type, "Like|Announce|EmojiReact")) {
768 const char *object = xs_dict_get(c_msg, "object");
769 xs *obj = NULL;
770
771 if (xs_is_dict(object)) {
772 obj = xs_dup(object);
773 object = xs_dict_get(object, "id");
774 }
775
776 /* bad object id? reject */
777 if (!xs_is_string(object))
778 return 0;
779
780 /* try to get the object */
781 if (!xs_is_dict(obj))
782 object_get(object, &obj);
783
784 /* if it's about one of our posts, accept it */
785 if (is_msg_mine(snac, object))
786 return 2;
787
788 /* blocked by hashtag? */
789 if (blocked_hashtag_check(snac, obj))
790 return 0;
791
792 /* if it's by someone we follow, accept it */
793 if (following_check(snac, actor))
794 return 1;
795
796 /* do we follow any hashtag? */
797 if (followed_hashtag_check(snac, obj))
798 return 7;
799
800 return 0;
801 }
802
803 /* if it's an Undo, it must be from someone related to us */
804 if (xs_match(type, "Undo")) {
805 return follower_check(snac, actor) || following_check(snac, actor);
806 }
807
808 /* if it's an Accept + Follow, it must be for a Follow we created */
809 if (xs_match(type, "Accept")) {
810 return following_check(snac, actor);
811 }
812
813 /* if it's a Follow, it must be explicitly for us */
814 if (xs_match(type, "Follow")) {
815 const char *object = xs_dict_get(c_msg, "object");
816 return !xs_is_null(object) && (strcmp(snac->actor, object) == 0 || strcmp(snac->actor_alt, object) == 0);
817 }
818
819 /* only accept Ping directed to us */
820 if (xs_match(type, "Ping")) {
821 const char *dest = xs_dict_get(c_msg, "to");
822 return !xs_is_null(dest) && (strcmp(snac->actor, dest) == 0 || strcmp(snac->actor_alt, dest) == 0);
823 }
824
825 /* if it's not a Create or Update, allow as is */
826 if (!xs_match(type, "Create|Update")) {
827 return 1;
828 }
829
830 const xs_dict *msg = xs_dict_get(c_msg, "object");
831
832 /* any blocked hashtag? reject */
833 if (blocked_hashtag_check(snac, msg)) {
834 snac_debug(snac, 1, xs_fmt("blocked by hashtag %s", xs_dict_get(msg, "id")));
835 return 0;
836 }
837
838 int pub_msg = is_msg_public(c_msg);
839
840 /* if this message is public and we follow the actor of this post, allow */
841 if (pub_msg && following_check(snac, actor))
842 return 1;
843
844 xs *rcpts = recipient_list(snac, msg, 0);
845 xs_list *p = rcpts;
846 const xs_str *v;
847
848 xs *actor_followers = NULL;
849
850 if (!pub_msg) {
851 /* not a public message; get the actor and its followers list */
852 xs *actor_obj = NULL;
853
854 if (valid_status(object_get(actor, &actor_obj))) {
855 const xs_val *fw = xs_dict_get(actor_obj, "followers");
856 if (fw)
857 actor_followers = xs_dup(fw);
858 }
859 }
860
861 while(xs_list_iter(&p, &v)) {
862 /* explicitly for me? accept */
863 if (strcmp(v, snac->actor) == 0 || strcmp(v, snac->actor_alt) == 0)
864 return 2;
865
866 if (pub_msg) {
867 /* a public message for someone we follow? (probably cc'ed) accept */
868 if (strcmp(v, public_address) != 0 && following_check(snac, v))
869 return 5;
870 }
871 else
872 if (actor_followers && strcmp(v, actor_followers) == 0) {
873 /* if this message is for this actor's followers, are we one of them? */
874 if (following_check(snac, actor))
875 return 6;
876 }
877 }
878
879 /* accept if it's by someone we follow */
880 const char *atto = get_atto(msg);
881
882 if (pub_msg && !xs_is_null(atto) && following_check(snac, atto))
883 return 3;
884
885 /* is this message a reply to another? */
886 const char *irt = get_in_reply_to(msg);
887 if (!xs_is_null(irt)) {
888 xs *r_msg = NULL;
889
890 /* try to get the replied message */
891 if (valid_status(object_get(irt, &r_msg))) {
892 atto = get_atto(r_msg);
893
894 /* accept if the replied message is from someone we follow */
895 if (pub_msg && !xs_is_null(atto) && following_check(snac, atto))
896 return 4;
897 }
898 }
899
900 /* does this message contain a tag we are following? */
901 if (pub_msg && followed_hashtag_check(snac, msg))
902 return 7;
903
904 return 0;
905}
906
907
908xs_str *process_tags(snac *snac, const char *content, xs_list **tag)
909/* parses mentions and tags from content */
910{
911 xs_str *nc = xs_str_new(NULL);
912 xs_list *tl = *tag;
913 xs *split;
914 xs_list *p;
915 const xs_val *v;
916 int n = 0;
917
918 /* create a default server for incomplete mentions */
919 xs *def_srv = NULL;
920
921 if (xs_list_len(tl)) {
922 /* if there are any mentions, get the server from
923 the first one, which is the inReplyTo author */
924 p = tl;
925 while (xs_list_iter(&p, &v)) {
926 const char *type = xs_dict_get(v, "type");
927 const char *name = xs_dict_get(v, "name");
928
929 if (type && name && strcmp(type, "Mention") == 0) {
930 xs *l = xs_split(name, "@");
931
932 def_srv = xs_dup(xs_list_get(l, -1));
933
934 break;
935 }
936 }
937 }
938
939 if (xs_is_null(def_srv))
940 /* use this same server */
941 def_srv = xs_dup(xs_dict_get(srv_config, "host"));
942
943 split = xs_regex_split(content, "(@[A-Za-z0-9_]+(@[A-Za-z0-9\\.-]+)?|&#[0-9]+;|#(_|[^[:punct:][:space:]])+)");
944
945 p = split;
946 while (xs_list_iter(&p, &v)) {
947 if ((n & 0x1)) {
948 if (*v == '@') {
949 xs *link = NULL;
950 xs *wuid = NULL;
951
952 if (strchr(v + 1, '@') == NULL) {
953 /* only one @? it's a dumb Mastodon-like mention
954 without server; add the default one */
955 wuid = xs_fmt("%s@%s", v, def_srv);
956
957 snac_debug(snac, 2, xs_fmt("mention without server '%s' '%s'", v, wuid));
958 }
959 else
960 wuid = xs_dup(v);
961
962 /* query the webfinger about this fellow */
963 xs *actor = NULL;
964 xs *uid = NULL;
965 int status;
966
967 status = webfinger_request(wuid, &actor, &uid);
968
969 if (valid_status(status) && actor && uid) {
970 xs *d = xs_dict_new();
971 xs *n = xs_fmt("@%s", uid);
972
973 d = xs_dict_append(d, "type", "Mention");
974 d = xs_dict_append(d, "href", actor);
975 d = xs_dict_append(d, "name", n);
976
977 tl = xs_list_append(tl, d);
978
979 link = xs_fmt("<span class=\"h-card\"><a href=\"%s\" class=\"u-url mention\">%s</a></span>", actor, n);
980 }
981
982 if (!xs_is_null(link))
983 nc = xs_str_cat(nc, link);
984 else
985 nc = xs_str_cat(nc, v);
986 }
987 else
988 if (*v == '#') {
989 /* hashtag */
990 xs *d = xs_dict_new();
991 xs *n = xs_utf8_to_lower(v);
992 xs *h = xs_fmt("%s?t=%s", srv_baseurl, n + 1);
993 xs *l = xs_fmt("<a href=\"%s\" class=\"mention hashtag\" rel=\"tag\">%s</a>", h, v);
994
995 d = xs_dict_append(d, "type", "Hashtag");
996 d = xs_dict_append(d, "href", h);
997 d = xs_dict_append(d, "name", n);
998
999 tl = xs_list_append(tl, d);
1000
1001 /* add the code */
1002 nc = xs_str_cat(nc, l);
1003 }
1004 else
1005 if (*v == '&') {
1006 /* HTML Unicode entity, probably part of an emoji */
1007
1008 /* write as is */
1009 nc = xs_str_cat(nc, v);
1010 }
1011 }
1012 else
1013 nc = xs_str_cat(nc, v);
1014
1015 n++;
1016 }
1017
1018 *tag = tl;
1019
1020 return nc;
1021}
1022
1023
1024void collect_replies(snac *user, const char *id)
1025/* collects all replies for a post */
1026{
1027 xs *obj = NULL;
1028
1029 if (!valid_status(object_get(id, &obj))) {
1030 snac_debug(user, 1, xs_fmt("collect_replies: object '%s' is not here", id));
1031 return;
1032 }
1033
1034 const xs_dict *replies_first = xs_dict_get_path(obj, "replies.first");
1035 if (!xs_is_dict(replies_first)) {
1036 snac_debug(user, 1, xs_fmt("collect_replies: object '%s' does not have replies.first", id));
1037 return;
1038 }
1039
1040 const xs_list *level0_replies = xs_dict_get(replies_first, "items");
1041 const xs_list *level1_replies = NULL;
1042
1043 const char *next = xs_dict_get(replies_first, "next");
1044 xs *reply_obj = NULL;
1045
1046 if (xs_is_string(next) && !valid_status(activitypub_request(user, next, &reply_obj))) {
1047 snac_debug(user, 1, xs_fmt("collect_replies: error getting next replies object '%s'", next));
1048 return;
1049 }
1050
1051 if (xs_is_dict(reply_obj))
1052 level1_replies = xs_dict_get(reply_obj, "items");
1053
1054 xs *items = xs_list_new();
1055
1056 if (xs_is_list(level0_replies))
1057 items = xs_list_cat(items, level0_replies);
1058
1059 if (xs_is_list(level1_replies))
1060 items = xs_list_cat(items, level1_replies);
1061
1062 const xs_val *v;
1063
1064 xs_list_foreach(items, v) {
1065 xs *reply = NULL;
1066
1067 if (xs_is_string(v)) {
1068 /* request the object */
1069 if (!valid_status(object_get(v, &reply))) {
1070 if (!valid_status(activitypub_request(user, v, &reply))) {
1071 snac_debug(user, 1, xs_fmt("collect_replies: error requesting object '%s'", v));
1072 continue;
1073 }
1074 }
1075 }
1076 else
1077 if (xs_is_dict(v)) {
1078 /* actually the post object */
1079 reply = xs_dup(v);
1080 }
1081
1082 if (!xs_is_dict(reply))
1083 continue;
1084
1085 const char *id = xs_dict_get(reply, "id");
1086 const char *type = xs_dict_get(reply, "type");
1087 const char *attr_to = get_atto(reply);
1088
1089 if (!xs_is_string(id) || !xs_is_string(type) || !xs_is_string(attr_to))
1090 continue;
1091
1092 if (!xs_match(type, POSTLIKE_OBJECT_TYPE))
1093 continue;
1094
1095 if (timeline_here(user, id)) {
1096 snac_debug(user, 1, xs_fmt("collect_replies: item already in timeline %s", id));
1097 continue;
1098 }
1099
1100 enqueue_actor_refresh(user, attr_to, 0);
1101
1102 timeline_add(user, id, reply);
1103
1104 snac_log(user, xs_fmt("new '%s' (collect_replies) %s %s", type, attr_to, id));
1105 }
1106}
1107
1108
1109void collect_outbox(snac *user, const char *actor_id)
1110/* gets an actor's outbox and inserts a bunch of posts in a user's timeline */
1111{
1112 int status;
1113 xs *actor = NULL;
1114
1115 if (!valid_status(status = actor_request(user, actor_id, &actor))) {
1116 snac_debug(user, 1, xs_fmt("collect_outbox: cannot get actor object '%s' %d", actor_id, status));
1117 return;
1118 }
1119
1120 xs *outbox = NULL;
1121 const char *outbox_url = xs_dict_get(actor, "outbox");
1122
1123 if (!xs_is_string(outbox_url))
1124 return;
1125
1126 if (!valid_status(status = activitypub_request(user, outbox_url, &outbox))) {
1127 snac_debug(user, 1, xs_fmt("collect_outbox: cannot get actor outbox '%s' %d", outbox_url, status));
1128 return;
1129 }
1130
1131 const xs_list *ordered_items = xs_dict_get(outbox, "orderedItems");
1132
1133 if (!xs_is_list(ordered_items)) {
1134 /* the list is not here; does it have a 'first'? */
1135 const char *first = xs_dict_get(outbox, "first");
1136
1137 if (xs_is_string(first)) {
1138 /* download this instead */
1139 xs *first2 = xs_dup(first);
1140 xs_free(outbox);
1141
1142 if (!valid_status(status = activitypub_request(user, first2, &outbox))) {
1143 snac_debug(user, 1, xs_fmt("collect_outbox: cannot get first page of outbox '%s' %d", first2, status));
1144 return;
1145 }
1146
1147 /* last chance */
1148 ordered_items = xs_dict_get(outbox, "orderedItems");
1149 }
1150 }
1151
1152 if (!xs_is_list(ordered_items)) {
1153 snac_debug(user, 1, xs_fmt("collect_outbox: cannot get list of posts for actor '%s' outbox", actor_id));
1154 return;
1155 }
1156
1157 /* well, ok, then */
1158 int max = 4;
1159 const xs_val *v;
1160
1161 xs_list_foreach(ordered_items, v) {
1162 if (max == 0)
1163 break;
1164
1165 xs *post = NULL;
1166
1167 if (xs_is_string(v)) {
1168 /* it's probably the post url */
1169 if (!valid_status(activitypub_request(user, v, &post)))
1170 continue;
1171 }
1172 else
1173 if (xs_is_dict(v))
1174 post = xs_dup(v);
1175
1176 if (post == NULL)
1177 continue;
1178
1179 const char *type = xs_dict_get(post, "type");
1180
1181 if (!xs_is_string(type) || strcmp(type, "Create")) {
1182 /* not a post */
1183 continue;
1184 }
1185 if (is_msg_for_me(user, post) == 0) {
1186 /* not for us */
1187 continue;
1188 }
1189
1190 const xs_dict *object = xs_dict_get(post, "object");
1191
1192 if (!xs_is_dict(object))
1193 continue;
1194
1195 type = xs_dict_get(object, "type");
1196 const char *id = xs_dict_get(object, "id");
1197 const char *attr_to = get_atto(object);
1198
1199 if (!xs_is_string(type) || !xs_is_string(id) || !xs_is_string(attr_to))
1200 continue;
1201
1202 if (!timeline_here(user, id)) {
1203 timeline_add(user, id, object);
1204 snac_log(user, xs_fmt("new '%s' (collect_outbox) %s %s", type, attr_to, id));
1205 }
1206 else
1207 snac_debug(user, 1, xs_fmt("collect_outbox: post '%s' already here", id));
1208
1209 max--;
1210 }
1211}
1212
1213
1214void notify(snac *snac, const char *type, const char *utype, const char *actor, const xs_dict *msg)
1215/* notifies the user of relevant events */
1216{
1217 /* skip our own notifications */
1218 if (strcmp(snac->actor, actor) == 0)
1219 return;
1220
1221 const char *id = xs_dict_get(msg, "id");
1222
1223 if (strcmp(type, "Create") == 0) {
1224 /* only notify of notes specifically for us */
1225 xs *rcpts = recipient_list(snac, msg, 0);
1226
1227 if (xs_list_in(rcpts, snac->actor) == -1)
1228 return;
1229
1230 /* discard votes */
1231 const xs_dict *note = xs_dict_get(msg, "object");
1232
1233 if (note && !xs_is_null(xs_dict_get(note, "name")))
1234 return;
1235 }
1236
1237 if (strcmp(type, "Undo") == 0 && strcmp(utype, "Follow") != 0)
1238 return;
1239
1240 /* get the object id */
1241 const char *objid = xs_dict_get(msg, "object");
1242
1243 if (xs_type(objid) == XSTYPE_DICT)
1244 objid = xs_dict_get(objid, "id");
1245
1246 if (xs_match(type, "Like|Announce|EmojiReact")) {
1247 /* if it's not an admiration about something by us, done */
1248 if (xs_is_null(objid) || !is_msg_mine(snac, objid))
1249 return;
1250
1251 /* if it's an announce by our own relay, done */
1252 xs *relay_id = xs_fmt("%s/relay", srv_baseurl);
1253 if (xs_startswith(id, relay_id))
1254 return;
1255 }
1256
1257 /* updated poll? */
1258 if (strcmp(type, "Update") == 0 && strcmp(utype, "Question") == 0) {
1259 const xs_dict *poll;
1260 const char *poll_id;
1261
1262 if ((poll = xs_dict_get(msg, "object")) == NULL)
1263 return;
1264
1265 /* if it's not closed, discard */
1266 if (xs_is_null(xs_dict_get(poll, "closed")))
1267 return;
1268
1269 if ((poll_id = xs_dict_get(poll, "id")) == NULL)
1270 return;
1271
1272 /* if it's not ours and we didn't vote, discard */
1273 if (!is_msg_mine(snac, poll_id) && !was_question_voted(snac, poll_id))
1274 return;
1275 }
1276
1277 /* user will love to know about this! */
1278
1279 /* prepare message body */
1280 xs *body = xs_fmt("User : @%s@%s\n",
1281 xs_dict_get(snac->config, "uid"),
1282 xs_dict_get(srv_config, "host")
1283 );
1284
1285 if (strcmp(utype, "(null)") != 0) {
1286 xs *s1 = xs_fmt("Type : %s + %s\n", type, utype);
1287 body = xs_str_cat(body, s1);
1288 }
1289 else {
1290 xs *s1 = xs_fmt("Type : %s\n", type);
1291 body = xs_str_cat(body, s1);
1292 }
1293
1294 {
1295 xs *s1 = xs_fmt("Actor : %s\n", actor);
1296 body = xs_str_cat(body, s1);
1297 }
1298
1299 if (objid != NULL) {
1300 xs *s1 = xs_fmt("Object: %s\n", objid);
1301 body = xs_str_cat(body, s1);
1302 }
1303
1304 /* email */
1305
1306 const char *email = "[disabled by admin]";
1307
1308 if (xs_type(xs_dict_get(srv_config, "disable_email_notifications")) != XSTYPE_TRUE) {
1309 email = xs_dict_get(snac->config_o, "email");
1310 if (xs_is_null(email)) {
1311 email = xs_dict_get(snac->config, "email");
1312
1313 if (xs_is_null(email))
1314 email = "[empty]";
1315 }
1316 }
1317
1318 if (*email != '\0' && *email != '[') {
1319 snac_debug(snac, 1, xs_fmt("email notify %s %s %s", type, utype, actor));
1320
1321 xs *subject = xs_fmt("snac notify for @%s@%s",
1322 xs_dict_get(snac->config, "uid"), xs_dict_get(srv_config, "host"));
1323 xs *from = xs_fmt("<snac-daemon@%s>", xs_dict_get(srv_config, "host"));
1324 xs *header = xs_fmt(
1325 "From: snac-daemon %s\n"
1326 "To: %s\n"
1327 "Subject: %s\n"
1328 "\n",
1329 from, email, subject);
1330
1331 xs *mailinfo = xs_dict_new();
1332 xs *bd = xs_fmt("%s%s", header, body);
1333 mailinfo = xs_dict_append(mailinfo, "from", from);
1334 mailinfo = xs_dict_append(mailinfo, "to", email);
1335 mailinfo = xs_dict_append(mailinfo, "body", bd);
1336
1337 enqueue_email(mailinfo, 0);
1338 }
1339
1340 /* telegram */
1341
1342 const char *bot = xs_dict_get(snac->config, "telegram_bot");
1343 const char *chat_id = xs_dict_get(snac->config, "telegram_chat_id");
1344
1345 if (!xs_is_null(bot) && !xs_is_null(chat_id) && *bot && *chat_id)
1346 enqueue_telegram(body, bot, chat_id);
1347
1348 /* ntfy */
1349 const char *ntfy_server = xs_dict_get(snac->config, "ntfy_server");
1350 const char *ntfy_token = xs_dict_get(snac->config, "ntfy_token");
1351
1352 if (!xs_is_null(ntfy_server) && *ntfy_server)
1353 enqueue_ntfy(body, ntfy_server, ntfy_token);
1354
1355 /* auto boost */
1356 if (xs_match(type, "Create") && xs_is_true(xs_dict_get(snac->config, "auto_boost"))) {
1357 xs *msg = msg_admiration(snac, objid, "Announce");
1358 enqueue_message(snac, msg);
1359
1360 snac_debug(snac, 1, xs_fmt("auto boosted %s", objid));
1361 }
1362
1363 /* finally, store it in the notification folder */
1364 if (strcmp(type, "Follow") == 0)
1365 objid = id;
1366 else
1367 if (strcmp(utype, "Follow") == 0)
1368 objid = actor;
1369
1370 notify_add(snac, type, utype, actor, objid != NULL ? objid : id, msg);
1371}
1372
1373/** messages **/
1374
1375xs_dict *msg_base(snac *snac, const char *type, const char *id,
1376 const char *actor, const char *date, const char *object)
1377/* creates a base ActivityPub message */
1378{
1379 xs *did = NULL;
1380 xs *published = NULL;
1381 xs *ntid = tid(0);
1382 const char *obj_id;
1383
1384 if (xs_type(object) == XSTYPE_DICT)
1385 obj_id = xs_dict_get(object, "id");
1386 else
1387 obj_id = object;
1388
1389 /* generated values */
1390 if (date && strcmp(date, "@now") == 0) {
1391 published = xs_str_utctime(0, ISO_DATE_SPEC);
1392 date = published;
1393 }
1394
1395 if (id != NULL) {
1396 if (strcmp(id, "@dummy") == 0) {
1397 did = xs_fmt("%s/d/%s/%s", snac->actor, ntid, type);
1398
1399 id = did;
1400 }
1401 else
1402 if (strcmp(id, "@object") == 0) {
1403 if (obj_id != NULL) {
1404 did = xs_fmt("%s/%s_%s", obj_id, type, ntid);
1405 id = did;
1406 }
1407 else
1408 id = NULL;
1409 }
1410 else
1411 if (strcmp(id, "@wrapper") == 0) {
1412 /* like @object, but always generate the same id */
1413 if (object != NULL) {
1414 date = xs_dict_get(object, "published");
1415 did = xs_fmt("%s/%s", obj_id, type);
1416 id = did;
1417 }
1418 else
1419 id = NULL;
1420 }
1421 }
1422
1423 xs_dict *msg = xs_dict_new();
1424
1425 msg = xs_dict_append(msg, "@context", "https:/" "/www.w3.org/ns/activitystreams");
1426 msg = xs_dict_append(msg, "type", type);
1427
1428 if (id != NULL)
1429 msg = xs_dict_append(msg, "id", id);
1430
1431 if (actor != NULL)
1432 msg = xs_dict_append(msg, "actor", actor);
1433
1434 if (date != NULL)
1435 msg = xs_dict_append(msg, "published", date);
1436
1437 if (object != NULL)
1438 msg = xs_dict_append(msg, "object", object);
1439
1440 return msg;
1441}
1442
1443
1444xs_dict *msg_collection(snac *snac, const char *id, int items)
1445/* creates an empty OrderedCollection message */
1446{
1447 xs_dict *msg = msg_base(snac, "OrderedCollection", id, NULL, NULL, NULL);
1448 xs *n = xs_number_new(items);
1449
1450 msg = xs_dict_append(msg, "attributedTo", snac->actor);
1451 msg = xs_dict_append(msg, "totalItems", n);
1452
1453 return msg;
1454}
1455
1456
1457xs_dict *msg_replies(snac *user, const char *id, int fill)
1458/* creates a CollectionPage with replies of id */
1459{
1460 xs *r_id = xs_replace(id, "/p/", "/r/");
1461 xs *r_idp = xs_fmt("%s?page=true", r_id);
1462 xs *r_idh = xs_fmt("%s", r_id);
1463
1464 xs_dict *msg = msg_base(user, "CollectionPage", r_idp, NULL, NULL, NULL);
1465
1466 msg = xs_dict_set(msg, "partOf", r_idh);
1467
1468 xs *items = xs_list_new();
1469 if (fill) {
1470 xs *children = object_children(id);
1471 const char *md5;
1472
1473 xs_list_foreach(children, md5) {
1474 xs *obj = NULL;
1475
1476 if (valid_status(object_get_by_md5(md5, &obj)) && is_msg_public(obj)) {
1477 const char *c_id = xs_dict_get(obj, "id");
1478
1479 if (xs_is_string(c_id))
1480 items = xs_list_append(items, c_id);
1481 }
1482 }
1483 }
1484 else {
1485 msg = xs_dict_del(msg, "@context");
1486 msg = xs_dict_del(msg, "id");
1487 msg = xs_dict_set(msg, "next", r_idp);
1488 }
1489
1490 msg = xs_dict_set(msg, "items", items);
1491
1492 return msg;
1493}
1494
1495
1496xs_dict *msg_accept(snac *snac, const xs_val *object, const char *to)
1497/* creates an Accept message (as a response to a Follow) */
1498{
1499 xs_dict *msg = msg_base(snac, "Accept", "@dummy", snac->actor, NULL, object);
1500
1501 msg = xs_dict_append(msg, "to", to);
1502
1503 return msg;
1504}
1505
1506
1507xs_dict *msg_update(snac *snac, const xs_dict *object)
1508/* creates an Update message */
1509{
1510 xs_dict *msg = msg_base(snac, "Update", "@object", snac->actor, "@now", object);
1511
1512 const char *type = xs_dict_get(object, "type");
1513
1514 if (strcmp(type, "Note") == 0) {
1515 msg = xs_dict_append(msg, "to", xs_dict_get(object, "to"));
1516 msg = xs_dict_append(msg, "cc", xs_dict_get(object, "cc"));
1517 }
1518 else
1519 if (strcmp(type, "Person") == 0) {
1520 msg = xs_dict_append(msg, "to", public_address);
1521
1522 /* also spam the people being followed, so that
1523 they have the newest information about who we are */
1524 xs *cc = following_list(snac);
1525
1526 msg = xs_dict_append(msg, "cc", cc);
1527 }
1528 else
1529 msg = xs_dict_append(msg, "to", public_address);
1530
1531 return msg;
1532}
1533
1534
1535xs_dict *msg_admiration(snac *snac, const char *object, const char *type)
1536/* creates a Like, Announce or EmojiReact message */
1537{
1538 xs *a_msg = NULL;
1539 xs_dict *msg = NULL;
1540 xs *wrk = NULL;
1541 char t = 0;
1542
1543 switch (*type) {
1544 case 'L':
1545 t = 'l';
1546 break;
1547 case 'A':
1548 t = 'a';
1549 break;
1550 case 'E':
1551 t = 'e';
1552 break;
1553 }
1554
1555 /* call the object */
1556 timeline_request(snac, &object, &wrk, 0);
1557
1558 if (valid_status(object_get(object, &a_msg))) {
1559 xs *rcpts = xs_list_new();
1560 xs *o_md5 = xs_md5_hex(object, strlen(object));
1561 xs *id = xs_fmt("%s/%c/%s", snac->actor, t, o_md5);
1562
1563 msg = msg_base(snac, type, id, snac->actor, "@now", object);
1564
1565 if (is_msg_public(a_msg))
1566 rcpts = xs_list_append(rcpts, public_address);
1567
1568 rcpts = xs_list_append(rcpts, get_atto(a_msg));
1569
1570 msg = xs_dict_append(msg, "to", rcpts);
1571 }
1572 else
1573 snac_log(snac, xs_fmt("msg_admiration cannot retrieve object %s", object));
1574
1575 return msg;
1576}
1577
1578
1579xs_dict *msg_repulsion(snac *user, const char *id, const char *type)
1580/* creates an Undo + admiration message */
1581{
1582 xs *a_msg = NULL;
1583 xs_dict *msg = NULL;
1584
1585 if (valid_status(object_get(id, &a_msg))) {
1586 /* create a clone of the original admiration message */
1587 xs *object = msg_admiration(user, id, type);
1588
1589 /* delete the published date */
1590 object = xs_dict_del(object, "published");
1591
1592 /* create an undo message for this object */
1593 msg = msg_undo(user, object);
1594
1595 /* copy the 'to' field */
1596 msg = xs_dict_set(msg, "to", xs_dict_get(object, "to"));
1597 }
1598
1599 /* now we despise this */
1600 object_unadmire(id, user->actor, *type == 'L' ? 1 : 0);
1601
1602 return msg;
1603}
1604
1605xs_dict *msg_emoji_init(snac *snac, const char *mid, const char *eid_o)
1606/* creates an emoji reaction from a local user */
1607{
1608 xs_dict *n_msg = msg_admiration(snac, mid, "EmojiReact");
1609
1610 xs *eid = xs_strip_chars_i(xs_dup(eid_o), ":");
1611 xs *content = NULL;
1612 xs *tag = xs_list_new();
1613 xs *dict = xs_dict_new();
1614 xs *icon = xs_dict_new();
1615 xs *accounts = xs_list_new();
1616 xs *emjs = emojis_rm_categories();
1617
1618 /* may be a default emoji */
1619 xs *eidd = xs_dup(eid);
1620 const char *eidda = eid;
1621
1622 if (xs_is_emoji(xs_utf8_dec(&eidda)))
1623 content = xs_dup(eid);
1624
1625 else if (*eid == '%') {
1626 content = xs_url_dec_emoji(xs_dup(eid));
1627 if (content == NULL) {
1628 xs_free(n_msg);
1629 return NULL;
1630 }
1631 }
1632 else {
1633 content = xs_fmt(":%s:", eid);
1634 const char *emo = xs_dict_get(emjs, content);
1635
1636 if (emo == NULL) {
1637 xs_free(n_msg);
1638 return NULL;
1639 }
1640
1641 if (xs_match(emo, "https://*|http://*")) { /* emoji is an URL to an image */
1642 icon = xs_dict_set(icon, "type", "Image");
1643 icon = xs_dict_set(icon, "url", emo);
1644 dict = xs_dict_set(dict, "icon", icon);
1645
1646 dict = xs_dict_set(dict, "id", emo);
1647 dict = xs_dict_set(dict, "name", content);
1648 dict = xs_dict_set(dict, "type", "Emoji");
1649 tag = xs_list_append(tag, dict);
1650 }
1651 else
1652 if (xs_startswith(emo, "&#")) {
1653 /* snac default emoji as an HTML entity: decode */
1654 content = xs_free(content);
1655
1656 xs *s1 = xs_strip_chars_i(xs_dup(emo), "&#");
1657 unsigned int cpoint = 0;
1658 sscanf(s1, "%u;", &cpoint);
1659
1660 if (cpoint)
1661 content = xs_utf8_cat(xs_str_new(NULL), cpoint);
1662 else
1663 content = xs_dup(emo);
1664 }
1665 else {
1666 /* use as it is and hope for the best */
1667 xs_free(content);
1668 content = xs_dup(emo);
1669 }
1670 }
1671
1672 accounts = xs_list_append(accounts, snac->actor);
1673
1674 xs *to_duplicate = xs_dup(xs_list_get(xs_dict_get(n_msg, "to"), 1));
1675 n_msg = xs_dict_set(n_msg, "content", content);
1676 n_msg = xs_dict_set(n_msg, "accounts", accounts);
1677 n_msg = xs_dict_set(n_msg, "attributedTo", to_duplicate);
1678 n_msg = xs_dict_set(n_msg, "accountId", snac->uid);
1679 n_msg = xs_dict_set(n_msg, "tag", tag);
1680
1681 int ret = timeline_admire(snac, xs_dict_get(n_msg, "object"), snac->actor, 1, n_msg);
1682 if (ret == 200 || ret == 201) {
1683 enqueue_message(snac, n_msg);
1684 return n_msg;
1685 }
1686
1687 xs_free(n_msg);
1688 return NULL;
1689}
1690
1691xs_dict *msg_emoji_unreact(snac *user, const char *mid, const char *eid)
1692/* creates an Undo + emoji reaction message */
1693{
1694 xs *a_msg = NULL;
1695 xs_dict *msg = NULL;
1696
1697 if (valid_status(object_get(mid, &a_msg))) {
1698 /* create a clone of the original admiration message */
1699 xs *object = msg_admiration(user, mid, "EmojiReact");
1700
1701 /* delete the published date */
1702 object = xs_dict_del(object, "published");
1703
1704 /* create an undo message for this object */
1705 msg = msg_undo(user, object);
1706
1707 /* copy the 'to' field */
1708 msg = xs_dict_set(msg, "to", xs_dict_get(object, "to"));
1709 }
1710
1711 xs *emotes = object_get_emoji_reacts(mid);
1712 const char *v;
1713 int c = 0;
1714
1715 /* may be a default emoji */
1716 if (strlen(eid) == 12 && *eid == '%') {
1717 eid = xs_url_dec(eid);
1718 if (eid == NULL) {
1719 xs_free(msg);
1720 return NULL;
1721 }
1722 }
1723
1724 /* lets get all emotes for this msg, and compare it to our content */
1725 while (xs_list_next(emotes, &v, &c)) {
1726 xs *e = NULL;
1727 if (valid_status(object_get_by_md5(v, &e))) {
1728 const char *content = xs_dict_get(e, "content");
1729 const char *id = xs_dict_get(e, "id");
1730 const char *actor = xs_dict_get(e, "actor");
1731 /* maybe formated as :{emoteName}: too */
1732 if (xs_str_in(eid, content) != -1)
1733 if (strcmp(user->actor, actor) == 0) {
1734 object_rm_emoji_react(mid, id);
1735 return msg;
1736 }
1737 }
1738 }
1739
1740 xs_free(msg);
1741 return NULL;
1742}
1743
1744
1745xs_dict *msg_actor_place(snac *user, const char *label)
1746/* creates a Place object, if the user has a location defined */
1747{
1748 xs_dict *place = NULL;
1749 const char *latitude = xs_dict_get_def(user->config, "latitude", "");
1750 const char *longitude = xs_dict_get_def(user->config, "longitude", "");
1751
1752 if (*latitude && *longitude) {
1753 xs *d_la = xs_number_new(atof(latitude));
1754 xs *d_lo = xs_number_new(atof(longitude));
1755
1756 place = msg_base(user, "Place", NULL, user->actor, NULL, NULL);
1757
1758 place = xs_dict_set(place, "name", label);
1759 place = xs_dict_set(place, "latitude", d_la);
1760 place = xs_dict_set(place, "longitude", d_lo);
1761 }
1762
1763 return place;
1764}
1765
1766
1767xs_dict *msg_actor(snac *snac)
1768/* create a Person message for this actor */
1769{
1770 xs *ctxt = xs_list_new();
1771 xs *icon = xs_dict_new();
1772 xs *keys = xs_dict_new();
1773 xs *tags = xs_list_new();
1774 xs *avtr = NULL;
1775 xs *kid = NULL;
1776 xs *f_bio = NULL;
1777 xs_dict *msg = NULL;
1778 const char *p;
1779 int n;
1780
1781 /* everybody loves some caching */
1782 if (time(NULL) - object_mtime(snac->actor) < 3 * 3600 &&
1783 valid_status(object_get(snac->actor, &msg))) {
1784 snac_debug(snac, 2, xs_fmt("Returning cached actor %s", snac->actor));
1785
1786 return msg;
1787 }
1788
1789 msg = msg_base(snac, "Person", snac->actor, NULL, NULL, NULL);
1790
1791 /* change the @context (is this really necessary?) */
1792 ctxt = xs_list_append(ctxt, "https:/" "/www.w3.org/ns/activitystreams");
1793 ctxt = xs_list_append(ctxt, "https:/" "/w3id.org/security/v1");
1794 msg = xs_dict_set(msg, "@context", ctxt);
1795
1796 msg = xs_dict_set(msg, "url", snac->actor);
1797 msg = xs_dict_set(msg, "name", xs_dict_get(snac->config, "name"));
1798 msg = xs_dict_set(msg, "preferredUsername", snac->uid);
1799 msg = xs_dict_set(msg, "published", xs_dict_get(snac->config, "published"));
1800
1801 // this exists so we get the emoji tags from our name too.
1802 // and then we just throw away the result, because it's kinda useless to have markdown in the display name.
1803 xs *name_dummy = not_really_markdown(xs_dict_get(snac->config, "name"), NULL, &tags);
1804
1805 xs *f_bio_2 = not_really_markdown(xs_dict_get(snac->config, "bio"), NULL, &tags);
1806 f_bio = process_tags(snac, f_bio_2, &tags);
1807 msg = xs_dict_set(msg, "summary", f_bio);
1808 msg = xs_dict_set(msg, "tag", tags);
1809
1810 char *folders[] = { "inbox", "outbox", "followers", "following", "featured", NULL };
1811 for (n = 0; folders[n]; n++) {
1812 xs *f = xs_fmt("%s/%s", snac->actor, folders[n]);
1813 msg = xs_dict_set(msg, folders[n], f);
1814 }
1815
1816 p = xs_dict_get(snac->config, "avatar");
1817
1818 if (*p == '\0')
1819 avtr = xs_fmt("%s/susie.png", srv_baseurl);
1820 else
1821 avtr = xs_dup(p);
1822
1823 icon = xs_dict_append(icon, "type", "Image");
1824 icon = xs_dict_append(icon, "mediaType", xs_mime_by_ext(avtr));
1825 icon = xs_dict_append(icon, "url", avtr);
1826 msg = xs_dict_set(msg, "icon", icon);
1827
1828 kid = xs_fmt("%s#main-key", snac->actor);
1829
1830 keys = xs_dict_append(keys, "id", kid);
1831 keys = xs_dict_append(keys, "owner", snac->actor);
1832 keys = xs_dict_append(keys, "publicKeyPem", xs_dict_get(snac->key, "public"));
1833 msg = xs_dict_set(msg, "publicKey", keys);
1834
1835 /* if the "bot" config field is set to true, change type to "Service" */
1836 if (xs_type(xs_dict_get(snac->config, "bot")) == XSTYPE_TRUE)
1837 msg = xs_dict_set(msg, "type", "Service");
1838
1839 /* if it's named "relay", then identify as an "Application" */
1840 if (strcmp(snac->uid, "relay") == 0)
1841 msg = xs_dict_set(msg, "type", "Application");
1842
1843 /* add the header image, if there is one defined */
1844 const char *header = xs_dict_get(snac->config, "header");
1845 if (!xs_is_null(header)) {
1846 xs *d = xs_dict_new();
1847 d = xs_dict_append(d, "type", "Image");
1848 d = xs_dict_append(d, "mediaType", xs_mime_by_ext(header));
1849 d = xs_dict_append(d, "url", header);
1850 msg = xs_dict_set(msg, "image", d);
1851 }
1852
1853 /* add the metadata as attachments of PropertyValue */
1854 xs *metadata = NULL;
1855 const xs_dict *md = xs_dict_get(snac->config, "metadata");
1856
1857 if (xs_type(md) == XSTYPE_DICT)
1858 metadata = xs_dup(md);
1859 else
1860 if (xs_type(md) == XSTYPE_STRING) {
1861 metadata = xs_dict_new();
1862 xs *l = xs_split(md, "\n");
1863 const char *ll;
1864
1865 xs_list_foreach(l, ll) {
1866 xs *kv = xs_split_n(ll, "=", 1);
1867 const char *k = xs_list_get(kv, 0);
1868 const char *v = xs_list_get(kv, 1);
1869
1870 if (k && v) {
1871 xs *kk = xs_strip_i(xs_dup(k));
1872 xs *vv = xs_strip_i(xs_dup(v));
1873 metadata = xs_dict_set(metadata, kk, vv);
1874 }
1875 }
1876 }
1877
1878 if (xs_type(metadata) == XSTYPE_DICT) {
1879 xs *attach = xs_list_new();
1880 const xs_str *k;
1881 const xs_str *v;
1882
1883 int c = 0;
1884 while (xs_dict_next(metadata, &k, &v, &c)) {
1885 xs *d = xs_dict_new();
1886
1887 xs *k2 = encode_html(k);
1888 xs *v2 = NULL;
1889
1890 if (xs_startswith(v, "https:/") || xs_startswith(v, "http:/")) {
1891 xs *t = encode_html(v);
1892 v2 = xs_fmt("<a href=\"%s\" rel=\"me\">%s</a>", t, t);
1893 }
1894 else
1895 v2 = encode_html(v);
1896
1897 d = xs_dict_append(d, "type", "PropertyValue");
1898 d = xs_dict_append(d, "name", k2);
1899 d = xs_dict_append(d, "value", v2);
1900
1901 attach = xs_list_append(attach, d);
1902 }
1903
1904 msg = xs_dict_set(msg, "attachment", attach);
1905 }
1906
1907 /* use shared inboxes? */
1908 if (xs_is_true(xs_dict_get(srv_config, "shared_inboxes")) || strcmp(snac->uid, "relay") == 0) {
1909 xs *d = xs_dict_new();
1910 xs *si = xs_fmt("%s/shared-inbox", srv_baseurl);
1911 d = xs_dict_append(d, "sharedInbox", si);
1912 msg = xs_dict_set(msg, "endpoints", d);
1913 }
1914
1915 /* does this user have an aka? */
1916 const char *aka = xs_dict_get(snac->config, "alias");
1917 if (xs_type(aka) == XSTYPE_STRING && *aka) {
1918 xs *loaka = xs_list_append(xs_list_new(), aka);
1919
1920 msg = xs_dict_set(msg, "alsoKnownAs", loaka);
1921 }
1922
1923 const xs_val *manually = xs_dict_get(snac->config, "approve_followers");
1924 msg = xs_dict_set(msg, "manuallyApprovesFollowers",
1925 xs_stock(xs_is_true(manually) ? XSTYPE_TRUE : XSTYPE_FALSE));
1926
1927 /* if there are location coords, create a Place object */
1928 xs *location = msg_actor_place(snac, "Home");
1929 if (xs_type(location) == XSTYPE_DICT)
1930 msg = xs_dict_set(msg, "location", location);
1931
1932 xs *webfinger = xs_fmt("%s@%s", snac->uid, xs_dict_get(srv_config, "host"));
1933 msg = xs_dict_set(msg, "webfinger", webfinger);
1934
1935 /* cache it */
1936 snac_debug(snac, 1, xs_fmt("Caching actor %s", snac->actor));
1937 object_add_ow(snac->actor, msg);
1938
1939 return msg;
1940}
1941
1942
1943xs_dict *msg_create(snac *snac, const xs_dict *object)
1944/* creates a 'Create' message */
1945{
1946 xs_dict *msg = msg_base(snac, "Create", "@wrapper", snac->actor, NULL, object);
1947 const xs_val *v;
1948
1949 if ((v = get_atto(object)))
1950 msg = xs_dict_append(msg, "attributedTo", v);
1951
1952 if ((v = xs_dict_get(object, "cc")))
1953 msg = xs_dict_append(msg, "cc", v);
1954
1955 if ((v = xs_dict_get(object, "to")))
1956 msg = xs_dict_append(msg, "to", v);
1957 else
1958 msg = xs_dict_append(msg, "to", public_address);
1959
1960 return msg;
1961}
1962
1963
1964xs_dict *msg_undo(snac *snac, const xs_val *object)
1965/* creates an 'Undo' message */
1966{
1967 xs_dict *msg = msg_base(snac, "Undo", "@object", snac->actor, "@now", object);
1968 const char *to;
1969
1970 if (xs_type(object) == XSTYPE_DICT && (to = xs_dict_get(object, "object")))
1971 msg = xs_dict_append(msg, "to", to);
1972
1973 return msg;
1974}
1975
1976
1977xs_dict *msg_delete(snac *snac, const char *id)
1978/* creates a 'Delete' + 'Tombstone' for a local entry */
1979{
1980 xs *tomb = xs_dict_new();
1981 xs_dict *msg = NULL;
1982
1983 /* sculpt the tombstone */
1984 tomb = xs_dict_append(tomb, "type", "Tombstone");
1985 tomb = xs_dict_append(tomb, "id", id);
1986
1987 /* now create the Delete */
1988 msg = msg_base(snac, "Delete", "@object", snac->actor, "@now", tomb);
1989
1990 xs *to = xs_list_new();
1991 xs *involved = object_likes(id);
1992 xs *boosts = object_announces(id);
1993 xs *children = object_children(id);
1994 const char *md5;
1995
1996 involved = xs_list_cat(involved, boosts);
1997 involved = xs_list_cat(involved, children);
1998
1999 /* add everybody */
2000 to = xs_list_append(to, public_address);
2001
2002 /* add actors that liked, boosted or replied to this */
2003 xs_list_foreach(involved, md5) {
2004 xs *actor = NULL;
2005
2006 if (valid_status(object_get_by_md5(md5, &actor))) {
2007 const char *id = xs_dict_get(actor, "id");
2008 const char *atto = get_atto(actor);
2009
2010 if (xs_is_string(atto))
2011 to = xs_list_append(to, atto);
2012 else
2013 if (xs_is_string(id))
2014 to = xs_list_append(to, id);
2015 }
2016 }
2017
2018 msg = xs_dict_append(msg, "to", to);
2019
2020 return msg;
2021}
2022
2023
2024xs_dict *msg_follow(snac *snac, const char *q)
2025/* creates a 'Follow' message */
2026{
2027 xs *actor_o = NULL;
2028 xs *actor = NULL;
2029 xs_dict *msg = NULL;
2030 int status;
2031
2032 xs *url_or_uid = xs_strip_i(xs_str_new(q));
2033
2034 if (xs_startswith(url_or_uid, "https:/") || xs_startswith(url_or_uid, "http:/"))
2035 actor = xs_dup(url_or_uid);
2036 else
2037 if (!valid_status(webfinger_request(url_or_uid, &actor, NULL)) || actor == NULL) {
2038 snac_log(snac, xs_fmt("cannot resolve user %s to follow", url_or_uid));
2039 return NULL;
2040 }
2041
2042 /* request the actor */
2043 status = actor_request(snac, actor, &actor_o);
2044
2045 if (valid_status(status)) {
2046 /* check if the actor is an alias */
2047 const char *r_actor = xs_dict_get(actor_o, "id");
2048
2049 if (r_actor && strcmp(actor, r_actor) != 0) {
2050 snac_log(snac, xs_fmt("actor to follow is an alias %s -> %s", actor, r_actor));
2051 }
2052
2053 msg = msg_base(snac, "Follow", "@dummy", snac->actor, NULL, r_actor);
2054 }
2055 else
2056 snac_log(snac, xs_fmt("cannot get actor to follow %s %d", actor, status));
2057
2058 return msg;
2059}
2060
2061
2062xs_dict *msg_note(snac *snac, const xs_str *content, const xs_val *rcpts,
2063 const xs_str *in_reply_to, const xs_list *attach,
2064 int scope, const char *lang_str, const char *msg_date)
2065/* creates a 'Note' message */
2066/* scope: 0, public; 1, private (mentioned only); 2, "quiet public"; 3, followers only */
2067{
2068 xs *ntid = tid(0);
2069 xs *id = xs_fmt("%s/p/%s", snac->actor, ntid);
2070 xs *ctxt = NULL;
2071 xs *fc2 = NULL;
2072 xs *fc1 = NULL;
2073 xs *to = NULL;
2074 xs *cc = xs_list_new();
2075 xs *irt = NULL;
2076 xs *tag = xs_list_new();
2077 xs *atls = xs_list_new();
2078
2079 /* discard non-parseable dates */
2080 if (!xs_is_string(msg_date) || xs_parse_iso_date(msg_date, 0) == 0)
2081 msg_date = NULL;
2082
2083 xs_dict *msg = msg_base(snac, "Note", id, NULL, xs_or(msg_date, "@now"), NULL);
2084 xs_list *p;
2085 const xs_val *v;
2086
2087 const int priv = (scope == SCOPE_MENTIONED || scope == SCOPE_FOLLOWERS);
2088
2089 if (rcpts == NULL)
2090 to = xs_list_new();
2091 else {
2092 if (xs_type(rcpts) == XSTYPE_STRING) {
2093 to = xs_list_new();
2094 to = xs_list_append(to, rcpts);
2095 }
2096 else
2097 to = xs_dup(rcpts);
2098 }
2099
2100 /* format the content */
2101 fc2 = not_really_markdown(content, &atls, &tag);
2102
2103 if (in_reply_to != NULL && *in_reply_to) {
2104 xs *p_msg = NULL;
2105 xs *wrk = NULL;
2106
2107 /* demand this thing */
2108 timeline_request(snac, &in_reply_to, &wrk, 0);
2109
2110 if (valid_status(object_get(in_reply_to, &p_msg))) {
2111 /* add this author as recipient */
2112 const char *a, *v;
2113
2114 if ((a = get_atto(p_msg)) && xs_list_in(to, a) == -1)
2115 to = xs_list_append(to, a);
2116
2117 /* add this author to the tag list as a mention */
2118 if (!xs_is_null(a)) {
2119 xs *l = xs_split(a, "/");
2120 xs *actor_o = NULL;
2121
2122 if (xs_list_len(l) > 3 && valid_status(object_get(a, &actor_o))) {
2123 const char *uname = xs_dict_get(actor_o, "preferredUsername");
2124
2125 if (!xs_is_null(uname) && *uname) {
2126 xs *handle = xs_fmt("@%s@%s", uname, xs_list_get(l, 2));
2127
2128 xs *t = xs_dict_new();
2129
2130 t = xs_dict_append(t, "type", "Mention");
2131 t = xs_dict_append(t, "href", a);
2132 t = xs_dict_append(t, "name", handle);
2133
2134 tag = xs_list_append(tag, t);
2135 }
2136 }
2137 }
2138
2139 /* get the context, if there is one */
2140 if ((v = xs_dict_get(p_msg, "context")))
2141 ctxt = xs_dup(v);
2142
2143 /* propagate the conversation field, if there is one */
2144 if ((v = xs_dict_get(p_msg, "conversation")))
2145 msg = xs_dict_append(msg, "conversation", v);
2146
2147 /* if this message is public or unlisted, ours will also be */
2148 const int orig_scope = get_msg_visibility(p_msg);
2149 if (!priv && orig_scope == SCOPE_PUBLIC && xs_list_in(to, public_address) == -1)
2150 to = xs_list_append(to, public_address);
2151 else
2152 if (!priv && orig_scope == SCOPE_UNLISTED && xs_list_in(cc, public_address) == -1)
2153 cc = xs_list_append(cc, public_address);
2154 }
2155
2156 irt = xs_dup(in_reply_to);
2157 }
2158 else
2159 irt = xs_val_new(XSTYPE_NULL);
2160
2161 /* extract the mentions and hashtags and convert the content */
2162 fc1 = process_tags(snac, fc2, &tag);
2163
2164 /* create the attachment list, if there are any */
2165 if (!xs_is_null(attach)) {
2166 xs_list_foreach(attach, v) {
2167 const char *url = xs_list_get(v, 0);
2168 const char *alt = xs_list_get(v, 1);
2169 const char *mime = xs_mime_by_ext(url);
2170 int add = 1;
2171
2172 /* check if it's already here */
2173 const xs_dict *ad;
2174 xs_list_foreach(atls, ad) {
2175 if (strcmp(xs_dict_get_def(ad, "url", ""), url) == 0) {
2176 add = 0;
2177 break;
2178 }
2179 }
2180
2181 if (add) {
2182 xs *d = xs_dict_new();
2183 d = xs_dict_append(d, "mediaType", mime);
2184 d = xs_dict_append(d, "url", url);
2185 d = xs_dict_append(d, "name", alt);
2186 d = xs_dict_append(d, "type",
2187 xs_startswith(mime, "image/") ? "Image" : "Document");
2188
2189 atls = xs_list_append(atls, d);
2190 }
2191 }
2192 }
2193
2194 if (ctxt == NULL)
2195 ctxt = xs_fmt("%s#ctxt", id);
2196
2197 /* add all mentions to the appropriate field */
2198 p = tag;
2199 while (xs_list_iter(&p, &v)) {
2200 if (xs_type(v) == XSTYPE_DICT) {
2201 const char *t;
2202
2203 if (!xs_is_null(t = xs_dict_get(v, "type")) && strcmp(t, "Mention") == 0) {
2204 if (!xs_is_null(t = xs_dict_get(v, "href"))) {
2205 if (scope == SCOPE_MENTIONED) {
2206 /* for DMs, mentions go to 'to' */
2207 to = xs_list_append(to, t);
2208 } else {
2209 /* for other visibility levels, mentions go to 'cc' */
2210 cc = xs_list_append(cc, t);
2211 }
2212 }
2213 }
2214 }
2215 }
2216
2217 if (scope == SCOPE_UNLISTED) {
2218 /* Mastodon's "quiet public": remove from to, add public address to cc */
2219 int idx;
2220 if ((idx = xs_list_in(to, public_address)) != -1)
2221 to = xs_list_del(to, idx);
2222 if (xs_list_in(cc, public_address) == -1)
2223 cc = xs_list_append(cc, public_address);
2224 }
2225 else
2226 if (scope == SCOPE_FOLLOWERS) {
2227 /* followers-only: add followers collection to to */
2228 xs *followers_url = xs_fmt("%s/followers", snac->actor);
2229 if (xs_list_in(to, followers_url) == -1)
2230 to = xs_list_append(to, followers_url);
2231 }
2232 else
2233 if (scope == SCOPE_PUBLIC) {
2234 /* public: ensure public address is in to and not in cc */
2235 int idx;
2236 if ((idx = xs_list_in(cc, public_address)) != -1)
2237 cc = xs_list_del(cc, idx);
2238 if (xs_list_in(to, public_address) == -1)
2239 to = xs_list_append(to, public_address);
2240 }
2241
2242 /* delete all cc recipients that also are in the to */
2243 p = to;
2244 while (xs_list_iter(&p, &v)) {
2245 int i;
2246
2247 if ((i = xs_list_in(cc, v)) != -1)
2248 cc = xs_list_del(cc, i);
2249 }
2250
2251 msg = xs_dict_append(msg, "attributedTo", snac->actor);
2252 msg = xs_dict_append(msg, "summary", "");
2253 msg = xs_dict_append(msg, "content", fc1);
2254 msg = xs_dict_append(msg, "context", ctxt);
2255 msg = xs_dict_append(msg, "url", id);
2256 msg = xs_dict_append(msg, "to", to);
2257 msg = xs_dict_append(msg, "cc", cc);
2258 msg = xs_dict_append(msg, "inReplyTo", irt);
2259 msg = xs_dict_append(msg, "tag", tag);
2260
2261 msg = xs_dict_append(msg, "sourceContent", content);
2262
2263 if (xs_list_len(atls))
2264 msg = xs_dict_append(msg, "attachment", atls);
2265
2266 /* set language content map */
2267 if (xs_type(lang_str) == XSTYPE_STRING) {
2268 /* split at the first _ */
2269 xs *l0 = xs_split(lang_str, "_");
2270 const char *lang = xs_list_get(l0, 0);
2271
2272 if (xs_type(lang) == XSTYPE_STRING && strlen(lang) == 2) {
2273 /* a valid ISO language id */
2274 xs *cmap = xs_dict_new();
2275 cmap = xs_dict_set(cmap, lang, xs_dict_get(msg, "content"));
2276 msg = xs_dict_set(msg, "contentMap", cmap);
2277 }
2278 }
2279
2280 if (!priv) {
2281 /* create the replies object */
2282 xs *replies = xs_dict_new();
2283 xs *r_id = xs_replace(id, "/p/", "/r/");
2284 xs *h_id = xs_fmt("%s", r_id);
2285 xs *rp = msg_replies(snac, id, 0);
2286
2287 replies = xs_dict_set(replies, "id", h_id);
2288 replies = xs_dict_set(replies, "type", "Collection");
2289 replies = xs_dict_set(replies, "first", rp);
2290
2291 msg = xs_dict_set(msg, "replies", replies);
2292 }
2293
2294 return msg;
2295}
2296
2297
2298xs_dict *msg_ping(snac *user, const char *rcpt)
2299/* creates a Ping message (https://humungus.tedunangst.com/r/honk/v/tip/f/docs/ping.txt) */
2300{
2301 xs_dict *msg = msg_base(user, "Ping", "@dummy", user->actor, NULL, NULL);
2302
2303 msg = xs_dict_append(msg, "to", rcpt);
2304
2305 return msg;
2306}
2307
2308
2309xs_dict *msg_pong(snac *user, const char *rcpt, const char *object)
2310/* creates a Pong message (https://humungus.tedunangst.com/r/honk/v/tip/f/docs/ping.txt) */
2311{
2312 xs_dict *msg = msg_base(user, "Pong", "@dummy", user->actor, NULL, object);
2313
2314 msg = xs_dict_append(msg, "to", rcpt);
2315
2316 return msg;
2317}
2318
2319
2320xs_dict *msg_move(snac *user, const char *new_account)
2321/* creates a Move message (to move the user to new_account) */
2322{
2323 xs_dict *msg = msg_base(user, "Move", "@dummy", user->actor, NULL, user->actor);
2324
2325 msg = xs_dict_append(msg, "target", new_account);
2326
2327 return msg;
2328}
2329
2330
2331xs_dict *msg_question(snac *user, const char *content, xs_list *attach,
2332 const xs_list *opts, int multiple, int end_secs)
2333/* creates a Question message */
2334{
2335 xs_dict *msg = msg_note(user, content, NULL, NULL, attach, 0, NULL, NULL);
2336 const xs_number *max_options = xs_dict_get(srv_config, "max_poll_options");
2337 const xs_number *max_length = xs_dict_get(srv_config, "max_poll_option_length");
2338 xs_set seen;
2339
2340 size_t max_line = 60;
2341 int max = 8;
2342 if (xs_type(max_options) == XSTYPE_NUMBER)
2343 max = xs_number_get(max_options);
2344 if (xs_type(max_length) == XSTYPE_NUMBER)
2345 max_line = xs_number_get(max_length);
2346
2347 msg = xs_dict_set(msg, "type", "Question");
2348
2349 /* make it non-editable */
2350 msg = xs_dict_del(msg, "sourceContent");
2351
2352 xs *o = xs_list_new();
2353 xs_list *p = (xs_list *)opts;
2354 const xs_str *v;
2355 xs *replies = xs_json_loads("{\"type\":\"Collection\",\"totalItems\":0}");
2356
2357 xs_set_init(&seen);
2358
2359 while (max && xs_list_iter(&p, &v)) {
2360 if (*v) {
2361 xs *v2 = xs_dup(v);
2362 xs *d = xs_dict_new();
2363
2364 if (strlen(v2) > max_line) {
2365 v2[max_line] = '\0';
2366 v2 = xs_str_cat(v2, "...");
2367 }
2368
2369 if (xs_set_add(&seen, v2) == 1) {
2370 d = xs_dict_append(d, "type", "Note");
2371 d = xs_dict_append(d, "name", v2);
2372 d = xs_dict_append(d, "replies", replies);
2373 o = xs_list_append(o, d);
2374
2375 max--;
2376 }
2377 }
2378 }
2379
2380 xs_set_free(&seen);
2381
2382 msg = xs_dict_append(msg, multiple ? "anyOf" : "oneOf", o);
2383
2384 /* set the end time */
2385 time_t t = time(NULL) + end_secs;
2386 xs *et = xs_str_utctime(t, ISO_DATE_SPEC);
2387
2388 msg = xs_dict_append(msg, "endTime", et);
2389
2390 return msg;
2391}
2392
2393int get_msg_visibility(const xs_dict *msg)
2394/* determine visibility from message based on CC, TO and /followers mark */
2395{
2396 const xs_val *to = xs_dict_get(msg, "to");
2397 const xs_val *cc = xs_dict_get(msg, "cc");
2398
2399 /* check if it's unlisted (public in cc but not in to) */
2400 int pub_in_to = 0;
2401 int pub_in_cc = 0;
2402
2403 if ((xs_type(to) == XSTYPE_STRING && strcmp(to, public_address) == 0) ||
2404 (xs_type(to) == XSTYPE_LIST && xs_list_in(to, public_address) != -1))
2405 pub_in_to = 1;
2406
2407 if ((xs_type(cc) == XSTYPE_STRING && strcmp(cc, public_address) == 0) ||
2408 (xs_type(cc) == XSTYPE_LIST && xs_list_in(cc, public_address) != -1))
2409 pub_in_cc = 1;
2410
2411 if (!pub_in_to && pub_in_cc) {
2412 return SCOPE_UNLISTED;
2413 }
2414 if (pub_in_to && !pub_in_cc) {
2415 return SCOPE_PUBLIC;
2416 }
2417
2418 xs *followers_url = xs_fmt("%s/followers", xs_dict_get(msg, "attributedTo"));
2419
2420 if ((xs_type(to) == XSTYPE_STRING && strcmp(to, followers_url) == 0) ||
2421 (xs_type(to) == XSTYPE_LIST && xs_list_in(to, followers_url) != -1))
2422 return SCOPE_FOLLOWERS;
2423 else
2424 return SCOPE_MENTIONED;
2425 /* should be unreachable, someone violated the protocol. */
2426 /* better treat it as followers-only to make sure we don't leak information.*/
2427 return SCOPE_FOLLOWERS;
2428}
2429
2430int update_question(snac *user, const char *id)
2431/* updates the poll counts */
2432{
2433 xs *msg = NULL;
2434 xs *rcnt = xs_dict_new();
2435 xs *lopts = xs_list_new();
2436 const xs_list *opts;
2437 xs_list *p;
2438 const xs_val *v;
2439
2440 /* get the object */
2441 if (!valid_status(object_get(id, &msg)))
2442 return -1;
2443
2444 /* closed? do nothing more */
2445 if (xs_dict_get(msg, "closed"))
2446 return -2;
2447
2448 /* get the options */
2449 if ((opts = xs_dict_get(msg, "oneOf")) == NULL &&
2450 (opts = xs_dict_get(msg, "anyOf")) == NULL)
2451 return -3;
2452
2453 /* fill the initial count */
2454 int c = 0;
2455 while (xs_list_next(opts, &v, &c)) {
2456 const char *name = xs_dict_get(v, "name");
2457 if (name) {
2458 lopts = xs_list_append(lopts, name);
2459 rcnt = xs_dict_set(rcnt, name, xs_stock(0));
2460 }
2461 }
2462
2463 xs_set s;
2464 xs_set_init(&s);
2465
2466 /* iterate now the children (the votes) */
2467 xs *chld = object_children(id);
2468 p = chld;
2469 while (xs_list_iter(&p, &v)) {
2470 xs *obj = NULL;
2471
2472 if (!valid_status(object_get_by_md5(v, &obj)))
2473 continue;
2474
2475 const char *name = xs_dict_get(obj, "name");
2476 const char *atto = get_atto(obj);
2477
2478 if (name && atto) {
2479 /* get the current count */
2480 const xs_number *cnt = xs_dict_get(rcnt, name);
2481
2482 if (xs_type(cnt) == XSTYPE_NUMBER) {
2483 /* if it exists, increment */
2484 xs *ucnt = xs_number_new(xs_number_get(cnt) + 1);
2485 rcnt = xs_dict_set(rcnt, name, ucnt);
2486
2487 xs_set_add(&s, atto);
2488 }
2489 }
2490 }
2491
2492 xs *rcpts = xs_set_result(&s);
2493
2494 /* create a new list of options with their new counts */
2495 xs *nopts = xs_list_new();
2496 p = lopts;
2497 while (xs_list_iter(&p, &v)) {
2498 const xs_number *cnt = xs_dict_get(rcnt, v);
2499
2500 if (xs_type(cnt) == XSTYPE_NUMBER) {
2501 xs *d1 = xs_dict_new();
2502 xs *d2 = xs_dict_new();
2503
2504 d2 = xs_dict_append(d2, "type", "Collection");
2505 d2 = xs_dict_append(d2, "totalItems", cnt);
2506
2507 d1 = xs_dict_append(d1, "type", "Note");
2508 d1 = xs_dict_append(d1, "name", v);
2509 d1 = xs_dict_append(d1, "replies", d2);
2510
2511 nopts = xs_list_append(nopts, d1);
2512 }
2513 }
2514
2515 /* update the list */
2516 msg = xs_dict_set(msg, xs_dict_get(msg, "oneOf") != NULL ? "oneOf" : "anyOf", nopts);
2517
2518 /* due date? */
2519 int closed = 0;
2520 const char *end_time = xs_dict_get(msg, "endTime");
2521 if (!xs_is_null(end_time)) {
2522 xs *now = xs_str_utctime(0, ISO_DATE_SPEC);
2523
2524 /* is now greater than the endTime? */
2525 if (strcmp(now, end_time) >= 0) {
2526 xs *et = xs_dup(end_time);
2527 msg = xs_dict_set(msg, "closed", et);
2528
2529 closed = 1;
2530 }
2531 }
2532
2533 /* update the count of voters */
2534 xs *vcnt = xs_number_new(xs_list_len(rcpts));
2535 msg = xs_dict_set(msg, "votersCount", vcnt);
2536 msg = xs_dict_set(msg, "cc", rcpts);
2537
2538 /* store */
2539 object_add_ow(id, msg);
2540
2541 snac_debug(user, 1, xs_fmt("recounted poll %s", id));
2542 timeline_touch(user);
2543
2544 /* send an update message to all voters */
2545 xs *u_msg = msg_update(user, msg);
2546 u_msg = xs_dict_set(u_msg, "cc", rcpts);
2547
2548 enqueue_message(user, u_msg);
2549
2550 if (closed) {
2551 xs *c_msg = msg_update(user, msg);
2552 notify(user, "Update", "Question", user->actor, c_msg);
2553 }
2554
2555 return 0;
2556}
2557
2558
2559/** queues **/
2560
2561int process_input_message(snac *snac, const xs_dict *msg, const xs_dict *req)
2562/* processes an ActivityPub message from the input queue */
2563/* return values: -1, fatal error; 0, transient error, retry;
2564 1, processed and done; 2, propagate to users (only when no user is set) */
2565{
2566 const char *actor = xs_dict_get(msg, "actor");
2567 const char *type = xs_dict_get(msg, "type");
2568 xs *actor_o = NULL;
2569 int a_status;
2570 int do_notify = 0;
2571
2572 if (xs_is_null(actor) || *actor == '\0') {
2573 srv_debug(0, xs_fmt("malformed message (bad actor)"));
2574 return -1;
2575 }
2576
2577 /* this instance is alive */
2578 instance_failure(actor, 2);
2579
2580 /* question votes may not have a type */
2581 if (xs_is_null(type))
2582 type = "Note";
2583
2584 /* reject uninteresting messages right now */
2585 if (xs_match(type, "Add|View|Reject|Read|Remove")) {
2586 srv_debug(0, xs_fmt("Ignored message of type '%s'", type));
2587
2588 /* archive the ignored activity */
2589 xs *ntid = tid(0);
2590 xs *fn = xs_fmt("%s/ignored/%s.json", srv_basedir, ntid);
2591 FILE *f;
2592
2593 if ((f = fopen(fn, "w")) != NULL) {
2594 xs_json_dump(msg, 4, f);
2595 fclose(f);
2596 }
2597
2598 return -1;
2599 }
2600
2601 if (strcmp(type, "EmojiReact") == 0 && xs_is_true(xs_dict_get(srv_config, "disable_emojireact"))) {
2602 srv_log(xs_fmt("Dropping EmojiReact from %s due to admin configuration", actor));
2603 return -1;
2604 }
2605
2606 const char *object, *utype;
2607
2608 object = xs_dict_get(msg, "object");
2609 if (object != NULL && xs_type(object) == XSTYPE_DICT)
2610 utype = xs_dict_get(object, "type");
2611 else
2612 utype = "(null)";
2613
2614 /* special case for Delete messages */
2615 if (strcmp(type, "Delete") == 0) {
2616 /* if the actor is not here, do not even try */
2617 if (!object_here(actor)) {
2618 srv_debug(1, xs_fmt("dropped 'Delete' message from unknown actor '%s'", actor));
2619 return -1;
2620 }
2621
2622 /* discard crap */
2623 if (xs_is_null(object)) {
2624 srv_log(xs_fmt("dropped 'Delete' message with invalid object from actor '%s'", actor));
2625 return -1;
2626 }
2627
2628 /* also discard if the object to be deleted is not here */
2629 const char *obj_id = object;
2630 if (xs_type(obj_id) == XSTYPE_DICT)
2631 obj_id = xs_dict_get(obj_id, "id");
2632
2633 if (xs_is_null(obj_id) || !object_here(obj_id)) {
2634 srv_debug(1, xs_fmt("dropped 'Delete' message from unknown object '%s'", obj_id));
2635 return -1;
2636 }
2637 }
2638
2639 /* bring the actor */
2640 a_status = actor_request(snac, actor, &actor_o);
2641
2642 /* do not retry permanent failures */
2643 if (a_status == HTTP_STATUS_NOT_FOUND
2644 || a_status == HTTP_STATUS_GONE
2645 || a_status < 0) {
2646 srv_debug(1, xs_fmt("dropping message due to actor error %s %d", actor, a_status));
2647 return -1;
2648 }
2649
2650 if (!valid_status(a_status)) {
2651 /* do not retry 'Delete' messages */
2652 if (strcmp(type, "Delete") == 0) {
2653 srv_debug(1, xs_fmt("dropping 'Delete' message due to actor error %s %d", actor, a_status));
2654 return -1;
2655 }
2656
2657 /* other actor download errors */
2658
2659 /* the actor may require a signed request; propagate if no user is set */
2660 if (snac == NULL)
2661 return 2;
2662
2663 /* may need a retry */
2664 srv_debug(0, xs_fmt("error requesting actor %s %d -- retry later", actor, a_status));
2665 return 0;
2666 }
2667
2668 /* check the signature */
2669 xs *sig_err = NULL;
2670
2671 if (!check_signature(req, &sig_err)) {
2672 srv_log(xs_fmt("bad signature %s (%s)", actor, sig_err));
2673
2674 srv_archive_error("check_signature", sig_err, req, msg);
2675 return -1;
2676 }
2677
2678 /* if no user is set, no further checks can be done; propagate */
2679 if (snac == NULL)
2680 return 2;
2681
2682 /* reject messages that are not for this user */
2683 if (!is_msg_for_me(snac, msg)) {
2684 snac_debug(snac, 1, xs_fmt("message from %s of type '%s' not for us", actor, type));
2685
2686 return 1;
2687 }
2688
2689 /* if it's a DM from someone we don't follow, reject the message */
2690 if (xs_type(xs_dict_get(snac->config, "drop_dm_from_unknown")) == XSTYPE_TRUE) {
2691 if (strcmp(utype, "Note") == 0 && !is_msg_public(msg) &&
2692 !following_check(snac, actor)) {
2693 snac_log(snac, xs_fmt("DM rejected from unknown actor %s", actor));
2694
2695 return 1;
2696 }
2697 }
2698
2699 /* check the minimum acceptable account age */
2700 int min_account_age = xs_number_get(xs_dict_get(srv_config, "min_account_age"));
2701
2702 if (min_account_age > 0) {
2703 const char *actor_date = xs_dict_get(actor_o, "published");
2704 if (!xs_is_null(actor_date)) {
2705 time_t actor_t = xs_parse_iso_date(actor_date, 0);
2706
2707 if (actor_t < 950000000) {
2708 snac_log(snac, xs_fmt("rejected activity from %s (suspicious date, %s)",
2709 actor, actor_date));
2710
2711 return 1;
2712 }
2713
2714 if (actor_t > 0) {
2715 int td = (int)(time(NULL) - actor_t);
2716
2717 snac_debug(snac, 2, xs_fmt("actor %s age: %d seconds", actor, td));
2718
2719 if (td < min_account_age) {
2720 snac_log(snac, xs_fmt("rejected activity from %s (too new, %d seconds)",
2721 actor, td));
2722
2723 return 1;
2724 }
2725 }
2726 }
2727 else
2728 snac_debug(snac, 1, xs_fmt("warning: empty or null creation date for %s", actor));
2729 }
2730
2731 if (strcmp(type, "Follow") == 0) { /** **/
2732 const char *id = xs_dict_get(msg, "id");
2733
2734 if (xs_is_null(id)) {
2735 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
2736 }
2737 else
2738 if (!follower_check(snac, actor)) {
2739 /* ensure the actor object is here */
2740 if (!object_here(actor)) {
2741 xs *actor_obj = NULL;
2742 actor_request(snac, actor, &actor_obj);
2743 object_add(actor, actor_obj);
2744 }
2745
2746 if (xs_is_true(xs_dict_get(snac->config, "approve_followers"))) {
2747 pending_add(snac, actor, msg);
2748
2749 snac_log(snac, xs_fmt("new pending follower approval %s", actor));
2750 }
2751 else {
2752 /* automatic following */
2753 xs *f_msg = xs_dup(msg);
2754 xs *reply = msg_accept(snac, f_msg, actor);
2755
2756 post_message(snac, actor, reply);
2757
2758 if (xs_is_null(xs_dict_get(f_msg, "published"))) {
2759 /* add a date if it doesn't include one (Mastodon) */
2760 xs *date = xs_str_utctime(0, ISO_DATE_SPEC);
2761 f_msg = xs_dict_set(f_msg, "published", date);
2762 }
2763
2764 timeline_add(snac, id, f_msg);
2765
2766 follower_add(snac, actor);
2767
2768 snac_log(snac, xs_fmt("new follower %s", actor));
2769 }
2770
2771 do_notify = 1;
2772 }
2773 else
2774 snac_log(snac, xs_fmt("repeated 'Follow' from %s", actor));
2775 }
2776 else
2777 if (strcmp(type, "Undo") == 0) { /** **/
2778 const char *id = xs_dict_get(object, "object");
2779 const char *content = xs_dict_get(object, "content");
2780 /* misskey sends emojis as like + tag */
2781 xs *cd = xs_dup(content);
2782 const char *sna = cd;
2783 const xs_dict *tag = xs_dict_get(object, "tag");
2784 unsigned int utf = xs_utf8_dec((const char **)&sna);
2785
2786 int isEmoji = 0;
2787 if (xs_is_emoji(utf) || (tag && xs_list_len(tag) > 0))
2788 isEmoji = 1;
2789
2790 if (xs_type(object) != XSTYPE_DICT) {
2791 snac_debug(snac, 1, xs_fmt("undo: overriding utype %s | %s | %s",
2792 utype, id, actor));
2793 utype = "Follow";
2794 }
2795
2796 if (strcmp(utype, "Follow") == 0) { /** **/
2797 if (!id) {
2798 snac_log(snac, xs_fmt("no id (msg.object.object) when "
2799 "handling follow: %s", actor));
2800 return 1;
2801 }
2802 if (strcmp(id, snac->actor) != 0 && strcmp(id, snac->actor_alt) != 0)
2803 snac_debug(snac, 1, xs_fmt("Undo + Follow from %s not for us (%s)", actor, id));
2804 else
2805 if (valid_status(follower_del(snac, actor))) {
2806 snac_log(snac, xs_fmt("no longer following us %s", actor));
2807 do_notify = 1;
2808 }
2809 else
2810 if (pending_check(snac, actor)) {
2811 pending_del(snac, actor);
2812 snac_log(snac, xs_fmt("cancelled pending follow from %s", actor));
2813 }
2814 else
2815 snac_log(snac, xs_fmt("error deleting follower %s", actor));
2816 }
2817 /* *key emojis are like w/ Emoji tag */
2818 else
2819 if ((isEmoji || strcmp(utype, "EmojiReact") == 0) &&
2820 (content && strcmp(content, "♥") != 0)) {
2821 const xs_val *mid = xs_dict_get(object, "id");
2822 int status = object_rm_emoji_react((char *)id, mid);
2823 /* ensure *key notifications type */
2824 utype = "EmojiReact";
2825
2826 snac_log(snac, xs_fmt("Undo 'EmojiReact' for %s %d", id, status));
2827 }
2828 else
2829 if (strcmp(utype, "Like") == 0) { /** **/
2830 int status = object_unadmire(id, actor, 1);
2831
2832 snac_log(snac, xs_fmt("Undo '%s' for %s %d", utype, id, status));
2833 }
2834 else
2835 if (strcmp(utype, "Announce") == 0) { /** **/
2836 int status = HTTP_STATUS_OK;
2837
2838 /* commented out: if a followed user boosts something that
2839 is requested and then unboosts, the post remains here,
2840 but with no apparent reason, and that is confusing */
2841 //status = object_unadmire(id, actor, 0);
2842
2843 snac_log(snac, xs_fmt("Unboost for %s %d", id, status));
2844 }
2845 else
2846 snac_debug(snac, 1, xs_fmt("ignored 'Undo' for object type '%s'", utype));
2847 }
2848 else
2849 if (strcmp(type, "Create") == 0) { /** **/
2850 if (is_muted(snac, actor)) {
2851 snac_log(snac, xs_fmt("ignored 'Create' + '%s' from muted actor %s", utype, actor));
2852 return 1;
2853 }
2854
2855 if (xs_match(utype, "Note|Article")) { /** **/
2856 const char *id = xs_dict_get(object, "id");
2857 const char *in_reply_to = get_in_reply_to(object);
2858 const char *atto = get_atto(object);
2859 xs *wrk = NULL;
2860
2861 if (xs_is_null(id))
2862 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
2863 else
2864 if (xs_is_null(atto))
2865 snac_log(snac, xs_fmt("malformed message: no 'attributedTo' field"));
2866 else
2867 if (!xs_is_null(in_reply_to) && is_hidden(snac, in_reply_to)) {
2868 snac_debug(snac, 0, xs_fmt("dropped reply %s to hidden post %s", id, in_reply_to));
2869 }
2870 else {
2871 if (content_match("filter_reject.txt", object)) {
2872 snac_log(snac, xs_fmt("rejected by content %s", id));
2873 return 1;
2874 }
2875
2876 if (strcmp(actor, atto) != 0)
2877 snac_log(snac, xs_fmt("SUSPICIOUS: actor != atto (%s != %s)", actor, atto));
2878
2879 timeline_request(snac, &in_reply_to, &wrk, 0);
2880
2881 const char *quoted_id = xs_or(xs_dict_get(object, "quoteUri"), xs_dict_get(object, "quoteUrl"));
2882
2883 if (xs_is_string(quoted_id) && xs_match(quoted_id, "https://*|http://*")) { /** **/
2884 xs *quoted_post = NULL;
2885 int status;
2886
2887 if (valid_status(status = activitypub_request(snac, quoted_id, "ed_post))) {
2888 /* got quoted post */
2889 object_add(quoted_id, quoted_post);
2890 }
2891
2892 snac_debug(snac, 1, xs_fmt("retrieving quoted post %s %d", quoted_id, status));
2893 }
2894
2895 if (timeline_add(snac, id, object)) {
2896 snac_log(snac, xs_fmt("new '%s' %s %s", utype, actor, id));
2897 do_notify = 1;
2898 }
2899
2900 /* if it has a "name" field, it may be a vote for a question */
2901 const char *name = xs_dict_get(object, "name");
2902
2903 if (!xs_is_null(name) && *name && !xs_is_null(in_reply_to) && *in_reply_to)
2904 update_question(snac, in_reply_to);
2905 }
2906 }
2907 else
2908 if (strcmp(utype, "Question") == 0) { /** **/
2909 const char *id = xs_dict_get(object, "id");
2910
2911 if (xs_is_null(id))
2912 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
2913 else
2914 if (timeline_add(snac, id, object))
2915 snac_log(snac, xs_fmt("new 'Question' %s %s", actor, id));
2916 }
2917 else
2918 if (xs_match(utype, "Audio|Video|Event")) { /** **/
2919 const char *id = xs_dict_get(object, "id");
2920
2921 if (xs_is_null(id))
2922 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
2923 else
2924 if (timeline_add(snac, id, object))
2925 snac_log(snac, xs_fmt("new '%s' %s %s", utype, actor, id));
2926 }
2927 else
2928 snac_debug(snac, 1, xs_fmt("ignored 'Create' for object type '%s'", utype));
2929 }
2930 else
2931 if (strcmp(type, "Accept") == 0) { /** **/
2932 if (strcmp(utype, "(null)") == 0) {
2933 const char *obj_id = xs_dict_get(msg, "object");
2934
2935 /* if the accepted object id is a string that may
2936 be created by us, it's a follow */
2937 if (xs_type(obj_id) == XSTYPE_STRING &&
2938 xs_startswith(obj_id, srv_baseurl) &&
2939 xs_endswith(obj_id, "/Follow"))
2940 utype = "Follow";
2941 }
2942
2943 if (strcmp(utype, "Follow") == 0) { /** **/
2944 if (following_check(snac, actor)) {
2945 following_add(snac, actor, msg);
2946 snac_log(snac, xs_fmt("confirmed follow from %s", actor));
2947
2948 /* request a bit of this fellow's outbox */
2949 enqueue_collect_outbox(snac, actor);
2950 }
2951 else
2952 snac_log(snac, xs_fmt("spurious follow accept from %s", actor));
2953 }
2954 else
2955 if (strcmp(utype, "Create") == 0) {
2956 /* some implementations send Create confirmations, go figure */
2957 snac_debug(snac, 1, xs_dup("ignored 'Accept' + 'Create'"));
2958 }
2959 else {
2960 srv_archive_error("accept", "ignored Accept", req, msg);
2961 snac_debug(snac, 1, xs_fmt("ignored 'Accept' for object type '%s'", utype));
2962 }
2963 }
2964 else
2965 if (strcmp(type, "Like") == 0 || strcmp(type, "EmojiReact") == 0) { /** **/
2966 /* misskey sends emojis as Like + tag.
2967 * It is easier to handle them both at the same time. */
2968 const char *sna = xs_dict_get(msg, "content");
2969 const xs_dict *tag = xs_dict_get(msg, "tag");
2970 unsigned int utf = xs_utf8_dec((const char **)&sna);
2971
2972 if (xs_is_emoji(utf) || (tag && xs_list_len(tag) > 0))
2973 type = "EmojiReact";
2974
2975 if (xs_type(object) == XSTYPE_DICT)
2976 object = xs_dict_get(object, "id");
2977
2978 if (xs_is_null(object))
2979 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
2980 else
2981 if (timeline_admire(snac, object, actor, 1, msg) == HTTP_STATUS_CREATED)
2982 snac_log(snac, xs_fmt("new '%s' %s %s", type, actor, object));
2983 else
2984 snac_log(snac, xs_fmt("repeated '%s' from %s to %s", type, actor, object));
2985
2986 do_notify = 1;
2987 }
2988 else
2989 if (strcmp(type, "Announce") == 0) { /** **/
2990 if (xs_type(object) == XSTYPE_DICT)
2991 object = xs_dict_get(object, "id");
2992
2993 if (xs_is_null(object))
2994 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
2995 else
2996 if (is_muted(snac, actor) && !is_msg_mine(snac, object))
2997 snac_log(snac, xs_fmt("dropped 'Announce' from muted actor %s", actor));
2998 else
2999 if (is_limited(snac, actor) && !is_msg_mine(snac, object))
3000 snac_log(snac, xs_fmt("dropped 'Announce' from limited actor %s", actor));
3001 else {
3002 xs *a_msg = NULL;
3003 xs *wrk = NULL;
3004
3005 timeline_request(snac, &object, &wrk, 0);
3006
3007 if (valid_status(object_get(object, &a_msg))) {
3008 const char *who = get_atto(a_msg);
3009
3010 /* got the admired object: instance is [back] online */
3011 instance_failure(object, 2);
3012
3013 if (who && !is_muted(snac, who)) {
3014 /* bring the actor */
3015 xs *who_o = NULL;
3016
3017 if (valid_status(actor_request(snac, who, &who_o))) {
3018 /* don't account as such announces by our own relay */
3019 xs *this_relay = xs_fmt("%s/relay", srv_baseurl);
3020
3021 if (strcmp(actor, this_relay) != 0) {
3022 if (valid_status(timeline_admire(snac, object, actor, 0, a_msg)))
3023 snac_log(snac, xs_fmt("new 'Announce' %s %s", actor, object));
3024 else
3025 snac_log(snac, xs_fmt("repeated 'Announce' from %s to %s",
3026 actor, object));
3027 }
3028
3029 /* distribute the post with the actor as 'proxy' */
3030 list_distribute(snac, actor, a_msg);
3031
3032 /* distribute the post to users following these hashtags */
3033 followed_hashtag_distribute(a_msg);
3034
3035 do_notify = 1;
3036 }
3037 else
3038 snac_debug(snac, 1, xs_fmt("dropped 'Announce' on actor request error %s", who));
3039 }
3040 else
3041 snac_log(snac, xs_fmt("ignored 'Announce' about muted actor %s", who));
3042 }
3043 else
3044 snac_debug(snac, 2, xs_fmt("error requesting 'Announce' object %s", object));
3045 }
3046 }
3047 else
3048 if (strcmp(type, "Update") == 0) { /** **/
3049 if (xs_match(utype, "Person|Service|Application")) { /** **/
3050 actor_add(actor, xs_dict_get(msg, "object"));
3051 timeline_touch(snac);
3052
3053 snac_log(snac, xs_fmt("updated actor %s", actor));
3054 }
3055 else
3056 if (xs_match(utype, "Note|Page|Article|Video|Audio|Event")) { /** **/
3057 const char *id = xs_dict_get(object, "id");
3058
3059 if (xs_is_null(id))
3060 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
3061 else
3062 if (object_here(id)) {
3063 if (xs_startswith(id, srv_baseurl) && !xs_startswith(id, actor))
3064 snac_log(snac, xs_fmt("ignored incorrect 'Update' %s %s", actor, id));
3065 else {
3066 object_add_ow(id, object);
3067 timeline_touch(snac);
3068
3069 snac_log(snac, xs_fmt("updated '%s' %s", utype, id));
3070 }
3071 }
3072 else
3073 snac_log(snac, xs_fmt("dropped update for unknown '%s' %s", utype, id));
3074 }
3075 else
3076 if (strcmp(utype, "Question") == 0) { /** **/
3077 const char *id = xs_dict_get(object, "id");
3078 const char *closed = xs_dict_get(object, "closed");
3079
3080 if (xs_is_null(id))
3081 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
3082 else {
3083 object_add_ow(id, object);
3084 timeline_touch(snac);
3085
3086 snac_log(snac, xs_fmt("%s poll %s", closed == NULL ? "updated" : "closed", id));
3087
3088 if (closed != NULL)
3089 do_notify = 1;
3090 }
3091 }
3092 else {
3093 srv_archive_error("unsupported_update", "unsupported_update", req, msg);
3094
3095 snac_log(snac, xs_fmt("ignored 'Update' for object type '%s'", utype));
3096 }
3097 }
3098 else
3099 if (strcmp(type, "Delete") == 0) { /** **/
3100 if (xs_type(object) == XSTYPE_DICT)
3101 object = xs_dict_get(object, "id");
3102
3103 if (xs_is_null(object))
3104 snac_log(snac, xs_fmt("malformed message: no 'id' field"));
3105 else
3106 if (object_here(object)) {
3107 if (xs_startswith(object, srv_baseurl) && !is_msg_mine(snac, object))
3108 snac_log(snac, xs_fmt("ignored incorrect 'Delete' %s %s", actor, object));
3109 else {
3110 timeline_del(snac, object);
3111 snac_debug(snac, 1, xs_fmt("new 'Delete' %s %s", actor, object));
3112 }
3113 }
3114 else
3115 snac_debug(snac, 1, xs_fmt("ignored 'Delete' for unknown object %s", object));
3116 }
3117 else
3118 if (strcmp(type, "Pong") == 0) { /** **/
3119 snac_log(snac, xs_fmt("'Pong' received from %s", actor));
3120 }
3121 else
3122 if (strcmp(type, "Ping") == 0) { /** **/
3123 const char *id = xs_dict_get(msg, "id");
3124
3125 snac_log(snac, xs_fmt("'Ping' requested from %s", actor));
3126
3127 if (!xs_is_null(id)) {
3128 xs *rsp = msg_pong(snac, actor, id);
3129
3130 enqueue_output_by_actor(snac, rsp, actor, 0);
3131 }
3132 }
3133 else
3134 if (strcmp(type, "Block") == 0) { /** **/
3135 snac_debug(snac, 1, xs_fmt("'Block' received from %s", actor));
3136
3137 /* should we MUTE the actor back? */
3138 /* mute(snac, actor); */
3139
3140 if (!xs_is_true(xs_dict_get(srv_config, "disable_block_notifications")))
3141 do_notify = 1;
3142 }
3143 else
3144 if (strcmp(type, "Move") == 0) { /** **/
3145 do_notify = 1;
3146
3147 const char *old_account = xs_dict_get(msg, "object");
3148 const char *new_account = xs_dict_get(msg, "target");
3149
3150 if (!xs_is_null(old_account) && !xs_is_null(new_account)) {
3151 if (following_check(snac, old_account)) {
3152 xs *n_actor = NULL;
3153
3154 if (valid_status(object_get(new_account, &n_actor))) {
3155 const xs_list *aka = xs_dict_get(n_actor, "alsoKnownAs");
3156
3157 if (xs_type(aka) == XSTYPE_LIST) {
3158 if (xs_list_in(aka, old_account) != -1) {
3159 /* all conditions met! */
3160
3161 /* follow new account */
3162 xs *f_msg = msg_follow(snac, new_account);
3163
3164 if (f_msg != NULL) {
3165 const char *new_actor = xs_dict_get(f_msg, "object");
3166 following_add(snac, new_actor, f_msg);
3167 enqueue_output_by_actor(snac, f_msg, new_actor, 0);
3168
3169 snac_log(snac, xs_fmt("'Move': following %s", new_account));
3170 }
3171
3172 /* unfollow old account */
3173 xs *of_msg = NULL;
3174
3175 if (valid_status(following_get(snac, old_account, &of_msg))) {
3176 xs *uf_msg = msg_undo(snac, xs_dict_get(of_msg, "object"));
3177 following_del(snac, old_account);
3178 enqueue_output_by_actor(snac, uf_msg, old_account, 0);
3179
3180 snac_log(snac, xs_fmt("'Move': unfollowing %s", old_account));
3181 }
3182 }
3183 else
3184 snac_log(snac, xs_fmt("'Move' error: old actor %s not found in %s 'alsoKnownAs'",
3185 old_account, new_account));
3186 }
3187 else
3188 snac_log(snac, xs_fmt("'Move' error: cannot get %s 'alsoKnownAs'", new_account));
3189 }
3190 else {
3191 snac_log(snac, xs_fmt("'Move' error: cannot get new actor %s", new_account));
3192
3193 /* may be a server hiccup, retry later */
3194 return 0;
3195 }
3196 }
3197 else
3198 snac_log(snac, xs_fmt("'Move' error: actor %s is not being followed", old_account));
3199 }
3200 else {
3201 snac_log(snac, xs_fmt("'Move' error: malformed message from %s", actor));
3202 srv_archive_error("move", "move", req, msg);
3203 }
3204 }
3205 else {
3206 srv_archive_error("unsupported_type", "unsupported_type", req, msg);
3207
3208 snac_debug(snac, 1, xs_fmt("process_input_message type '%s' ignored", type));
3209 }
3210
3211 if (do_notify) {
3212 notify(snac, type, utype, actor, msg);
3213
3214 timeline_touch(snac);
3215 }
3216
3217 return 1;
3218}
3219
3220
3221int send_email(const xs_dict *mailinfo)
3222/* invoke curl */
3223{
3224 const char *url = xs_dict_get(srv_config, "smtp_url");
3225
3226 if (!xs_is_string(url) || *url == '\0') {
3227 /* revert back to old sendmail pipe behaviour */
3228 const char *msg = xs_dict_get(mailinfo, "body");
3229 FILE *f;
3230 int status;
3231 int fds[2];
3232 pid_t pid;
3233
3234 if (pipe(fds) == -1) return -1;
3235 pid = vfork();
3236 if (pid == -1) return -1;
3237 else if (pid == 0) {
3238 dup2(fds[0], 0);
3239 close(fds[0]);
3240 close(fds[1]);
3241 execl("/usr/sbin/sendmail", "sendmail", "-t", (char *) NULL);
3242 _exit(1);
3243 }
3244 close(fds[0]);
3245 if ((f = fdopen(fds[1], "w")) == NULL) {
3246 close(fds[1]);
3247 return -1;
3248 }
3249 fprintf(f, "%s\n", msg);
3250 fclose(f);
3251 if (waitpid(pid, &status, 0) == -1) return -1;
3252 return status;
3253 }
3254
3255 const char
3256 *user = xs_dict_get(srv_config, "smtp_username"),
3257 *pass = xs_dict_get(srv_config, "smtp_password"),
3258 *from = xs_dict_get(mailinfo, "from"),
3259 *to = xs_dict_get(mailinfo, "to"),
3260 *body = xs_dict_get(mailinfo, "body");
3261
3262 if (url == NULL || *url == '\0')
3263 url = "smtp://localhost";
3264
3265 int smtp_port = parse_port(url, NULL);
3266
3267 return xs_smtp_request(url, user, pass, from, to, body, smtp_port == 465 || smtp_port == 587);
3268}
3269
3270
3271void process_user_queue_item(snac *user, xs_dict *q_item)
3272/* processes an item from the user queue */
3273{
3274 const char *type;
3275 int queue_retry_max = xs_number_get(xs_dict_get(srv_config, "queue_retry_max"));
3276
3277 if ((type = xs_dict_get(q_item, "type")) == NULL)
3278 type = "output";
3279
3280 if (strcmp(type, "message") == 0) {
3281 const xs_dict *msg = xs_dict_get(q_item, "message");
3282 xs *rcpts = recipient_list(user, msg, 1);
3283 xs_set inboxes;
3284 const xs_str *actor;
3285
3286 xs_set_init(&inboxes);
3287
3288 /* add this shared inbox first */
3289 xs *this_shared_inbox = xs_fmt("%s/shared-inbox", srv_baseurl);
3290 xs_set_add(&inboxes, this_shared_inbox);
3291 enqueue_output(user, msg, this_shared_inbox, 0, 0);
3292
3293 /* iterate the recipients */
3294 xs_list_foreach(rcpts, actor) {
3295 /* local users were served by this_shared_inbox */
3296 if (!xs_startswith(actor, srv_baseurl)) {
3297 xs *inbox = get_actor_inbox(actor, 1);
3298
3299 if (inbox != NULL) {
3300 /* add to the set and, if it's not there, send message */
3301 if (xs_set_add(&inboxes, inbox) == 1)
3302 enqueue_output(user, msg, inbox, 0, 0);
3303 }
3304 else
3305 snac_log(user, xs_fmt("cannot find inbox for %s", actor));
3306 }
3307 }
3308
3309 /* if it's a public note or question, send to the collected inboxes */
3310 if (xs_match(xs_dict_get_def(msg, "type", ""), "Create|Update") && is_msg_public(msg)) {
3311 if (xs_type(xs_dict_get(srv_config, "disable_inbox_collection")) != XSTYPE_TRUE) {
3312 xs *shibx = inbox_list();
3313 const xs_str *inbox;
3314
3315 xs_list_foreach(shibx, inbox) {
3316 if (xs_set_add(&inboxes, inbox) == 1)
3317 enqueue_output(user, msg, inbox, 0, 0);
3318 }
3319 }
3320 }
3321
3322 xs_set_free(&inboxes);
3323
3324 /* relay this note */
3325 if (is_msg_public(msg) && strcmp(user->uid, "relay") != 0) { /* avoid loops */
3326 snac relay;
3327 if (user_open(&relay, "relay")) {
3328 /* a 'relay' user exists */
3329 const char *type = xs_dict_get(msg, "type");
3330
3331 if (xs_is_string(type) && strcmp(type, "Create") == 0) {
3332 const xs_val *object = xs_dict_get(msg, "object");
3333
3334 if (xs_is_dict(object)) {
3335 object = xs_dict_get(object, "id");
3336
3337 snac_debug(&relay, 1, xs_fmt("relaying message %s", object));
3338
3339 xs *boost = msg_admiration(&relay, object, "Announce");
3340 enqueue_message(&relay, boost);
3341 }
3342 }
3343
3344 user_free(&relay);
3345 }
3346 }
3347 }
3348 else
3349 if (strcmp(type, "input") == 0) {
3350 /* process the message */
3351 const xs_dict *msg = xs_dict_get(q_item, "message");
3352 const xs_dict *req = xs_dict_get(q_item, "req");
3353 int retries = xs_number_get(xs_dict_get(q_item, "retries"));
3354
3355 if (xs_is_null(msg))
3356 return;
3357
3358 if (!process_input_message(user, msg, req)) {
3359 if (retries > queue_retry_max)
3360 snac_log(user, xs_fmt("input giving up"));
3361 else {
3362 /* reenqueue */
3363 enqueue_input(user, msg, req, retries + 1);
3364 snac_log(user, xs_fmt("input requeue #%d", retries + 1));
3365 }
3366 }
3367 }
3368 else
3369 if (strcmp(type, "close_question") == 0) {
3370 /* the time for this question has ended */
3371 const char *id = xs_dict_get(q_item, "message");
3372
3373 if (!xs_is_null(id))
3374 update_question(user, id);
3375 }
3376 else
3377 if (strcmp(type, "object_request") == 0) {
3378 const char *id = xs_dict_get(q_item, "message");
3379
3380 if (!xs_is_null(id)) {
3381 int status;
3382 xs *data = NULL;
3383
3384 status = activitypub_request(user, id, &data);
3385
3386 if (valid_status(status))
3387 object_add_ow(id, data);
3388
3389 snac_debug(user, 1, xs_fmt("object_request %s %d", id, status));
3390 }
3391 }
3392 else
3393 if (strcmp(type, "verify_links") == 0) {
3394 verify_links(user);
3395 }
3396 else
3397 if (strcmp(type, "actor_refresh") == 0) {
3398 const char *actor = xs_dict_get(q_item, "actor");
3399 double mtime = object_mtime(actor);
3400
3401 if (actor_failure(actor, 0) == -1) {
3402 /* actor is broken beyond repair */
3403 snac_debug(user, 1, xs_fmt("actor_refresh skipped broken actor %s", actor));
3404 }
3405 else
3406 /* only refresh if it was refreshed more than an hour ago */
3407 if (mtime + 3600.0 < (double) time(NULL)) {
3408 xs *actor_o = NULL;
3409 int status;
3410
3411 if (valid_status((status = activitypub_request(user, actor, &actor_o)))) {
3412 /* refresh collection counts with throttling to prevent resource exhaustion */
3413 actor_o = actor_get_collections(user, actor_o, 1);
3414
3415 actor_add(actor, actor_o);
3416 }
3417 else {
3418 if (status == HTTP_STATUS_GONE || status == HTTP_STATUS_NOT_FOUND) {
3419 actor_failure(actor, 1);
3420 snac_log(user, xs_fmt("actor_refresh marking actor %s as broken %d", actor, status));
3421 }
3422 else {
3423 actor_failure(actor, 2);
3424 object_touch(actor);
3425 }
3426 }
3427
3428 snac_log(user, xs_fmt("actor_refresh %s %d", actor, status));
3429 }
3430 }
3431 else
3432 if (strcmp(type, "notify_webhook") == 0) {
3433 const char *webhook = xs_dict_get(user->config, "notify_webhook");
3434
3435 if (xs_is_string(webhook) && xs_match(webhook, "https://*|http://*")) { /** **/
3436 const xs_dict *msg = xs_dict_get(q_item, "message");
3437 int retries = xs_number_get(xs_dict_get(q_item, "retries"));
3438
3439 xs *hdrs = xs_dict_new();
3440
3441 hdrs = xs_dict_set(hdrs, "content-type", "application/json");
3442 hdrs = xs_dict_set(hdrs, "user-agent", USER_AGENT);
3443
3444 xs *body = xs_json_dumps(msg, 4);
3445
3446 int status;
3447 xs *rsp = xs_http_request("POST", webhook, hdrs, body, strlen(body), &status, NULL, NULL, 0);
3448
3449 snac_debug(user, 0, xs_fmt("webhook post %s %d", webhook, status));
3450
3451 if (!valid_status(status)) {
3452 retries++;
3453
3454 if (retries > queue_retry_max)
3455 snac_debug(user, 0, xs_fmt("webhook post giving up %s", webhook));
3456 else {
3457 snac_debug(user, 0, xs_fmt("webhook post requeue %s %d", webhook, retries));
3458
3459 enqueue_notify_webhook(user, msg, retries);
3460 }
3461 }
3462 }
3463 }
3464 else
3465 if (strcmp(type, "collect_replies") == 0) {
3466 const char *post = xs_dict_get(q_item, "message");
3467
3468 collect_replies(user, post);
3469 }
3470 else
3471 if (strcmp(type, "collect_outbox") == 0) {
3472 const char *actor_id = xs_dict_get(q_item, "message");
3473
3474 collect_outbox(user, actor_id);
3475 }
3476 else
3477 snac_log(user, xs_fmt("unexpected user q_item type '%s'", type));
3478}
3479
3480
3481int process_user_queue(snac *snac)
3482/* processes a user's queue */
3483{
3484 int cnt = 0;
3485 xs *list = user_queue(snac);
3486
3487 xs_list *p = list;
3488 const xs_str *fn;
3489
3490 while (xs_list_iter(&p, &fn)) {
3491 xs *q_item = dequeue(fn);
3492
3493 if (q_item == NULL)
3494 continue;
3495
3496 process_user_queue_item(snac, q_item);
3497 cnt++;
3498 }
3499
3500 scheduled_process(snac);
3501
3502 return cnt;
3503}
3504
3505
3506xs_str *str_status(int status)
3507{
3508 return xs_fmt("%d %s", status, status < 0 ? xs_curl_strerr(status) : xs_http_status_text(status));
3509}
3510
3511
3512void process_queue_item(xs_dict *q_item)
3513/* processes an item from the global queue */
3514{
3515 const char *type = xs_dict_get(q_item, "type");
3516 int queue_retry_max = xs_number_get(xs_dict_get(srv_config, "queue_retry_max"));
3517
3518 if (strcmp(type, "output") == 0) {
3519 int status;
3520 const xs_str *inbox = xs_dict_get(q_item, "inbox");
3521 const xs_str *keyid = xs_dict_get(q_item, "keyid");
3522 const xs_str *seckey = xs_dict_get(q_item, "seckey");
3523 const xs_dict *msg = xs_dict_get(q_item, "message");
3524 int retries = xs_number_get(xs_dict_get(q_item, "retries"));
3525 int p_status = xs_number_get(xs_dict_get(q_item, "p_status"));
3526 xs *payload = NULL;
3527 int p_size = 0;
3528 int timeout = 0;
3529
3530 if (xs_is_null(inbox) || xs_is_null(msg) || xs_is_null(keyid) || xs_is_null(seckey)) {
3531 srv_log(xs_fmt("output message error: missing fields"));
3532 return;
3533 }
3534
3535 if (is_instance_blocked(inbox)) {
3536 srv_debug(0, xs_fmt("discarded output message to blocked instance %s", inbox));
3537 return;
3538 }
3539
3540 if (instance_failure(inbox, 0)) {
3541 srv_debug(1, xs_fmt("output message error: too many failures for instance %s", inbox));
3542 return;
3543 }
3544
3545 /* deliver (if previous error status was a timeout, try now longer) */
3546 if (p_status == 599)
3547 timeout = xs_number_get(xs_dict_get_def(srv_config, "queue_timeout_2", "8"));
3548 else
3549 timeout = xs_number_get(xs_dict_get_def(srv_config, "queue_timeout", "6"));
3550
3551 if (timeout == 0)
3552 timeout = 6;
3553
3554 status = send_to_inbox_raw(keyid, seckey, inbox, msg, &payload, &p_size, timeout);
3555
3556 /* register or clear a value for this instance */
3557 instance_failure(inbox, valid_status(status) ? 2 : 1);
3558
3559 if (payload) {
3560 if (p_size > 1024) {
3561 /* trim the message */
3562 payload[1024] = '\0';
3563 payload = xs_str_cat(payload, "...");
3564 }
3565
3566 /* strip ugly control characters */
3567 payload = xs_replace_i(payload, "\n", "");
3568 payload = xs_replace_i(payload, "\r", "");
3569
3570 if (*payload)
3571 payload = xs_str_wrap_i(" [", payload, "]");
3572 }
3573 else
3574 payload = xs_str_new(NULL);
3575
3576 xs *s_status = str_status(status);
3577
3578 srv_log(xs_fmt("output message: sent to inbox %s (%s)%s", inbox, s_status, payload));
3579
3580 if (!valid_status(status)) {
3581 retries++;
3582
3583 /* if it's not the first time it fails with a timeout,
3584 penalize the server by skipping one retry */
3585 if (p_status == status && status == HTTP_STATUS_CLIENT_CLOSED_REQUEST)
3586 retries++;
3587
3588 /* error sending; requeue? */
3589 if (status == HTTP_STATUS_BAD_REQUEST
3590 || status == HTTP_STATUS_NOT_FOUND
3591 || status == HTTP_STATUS_METHOD_NOT_ALLOWED
3592 || status == HTTP_STATUS_GONE
3593 || status == HTTP_STATUS_UNPROCESSABLE_CONTENT
3594 || status < 0)
3595 /* explicit error: discard */
3596 srv_log(xs_fmt("output message: error %s (%s)", inbox, s_status));
3597 else
3598 if (retries > queue_retry_max)
3599 srv_log(xs_fmt("output message: giving up %s (%s)", inbox, s_status));
3600 else {
3601 /* requeue */
3602 enqueue_output_raw(keyid, seckey, msg, inbox, retries, status);
3603 srv_log(xs_fmt("output message: requeue %s #%d", inbox, retries));
3604 }
3605 }
3606 }
3607 else
3608 if (strcmp(type, "email") == 0) {
3609 /* send this email */
3610 const xs_dict *msg = xs_dict_get(q_item, "message");
3611 int retries = xs_number_get(xs_dict_get(q_item, "retries"));
3612
3613 if (!send_email(msg))
3614 srv_debug(1, xs_fmt("email message sent"));
3615 else {
3616 retries++;
3617
3618 if (retries > queue_retry_max)
3619 srv_log(xs_fmt("email giving up (errno: %d)", errno));
3620 else {
3621 /* requeue */
3622 srv_log(xs_fmt(
3623 "email requeue #%d (errno: %d)", retries, errno));
3624
3625 enqueue_email(msg, retries);
3626 }
3627 }
3628 }
3629 else
3630 if (strcmp(type, "telegram") == 0) {
3631 /* send this via telegram */
3632 const char *bot = xs_dict_get(q_item, "bot");
3633 const char *msg = xs_dict_get(q_item, "message");
3634 xs *chat_id = xs_dup(xs_dict_get(q_item, "chat_id"));
3635 int status = 0;
3636
3637 /* chat_id must start with a - */
3638 if (!xs_startswith(chat_id, "-"))
3639 chat_id = xs_str_wrap_i("-", chat_id, NULL);
3640
3641 xs *url = xs_fmt("https:/" "/api.telegram.org/bot%s/sendMessage", bot);
3642 xs *body = xs_fmt("{\"chat_id\":%s,\"text\":\"%s\"}", chat_id, msg);
3643
3644 xs *headers = xs_dict_new();
3645 headers = xs_dict_append(headers, "content-type", "application/json");
3646
3647 xs *rsp = xs_http_request("POST", url, headers,
3648 body, strlen(body), &status, NULL, NULL, 0);
3649 rsp = xs_free(rsp);
3650
3651 srv_debug(0, xs_fmt("telegram post %d", status));
3652 }
3653 else
3654 if (strcmp(type, "ntfy") == 0) {
3655 /* send this via ntfy */
3656 const char *ntfy_server = xs_dict_get(q_item, "ntfy_server");
3657 const char *msg = xs_dict_get(q_item, "message");
3658 const char *ntfy_token = xs_dict_get(q_item, "ntfy_token");
3659 int status = 0;
3660
3661 xs *url = xs_fmt("%s", ntfy_server);
3662 xs *body = xs_fmt("%s", msg);
3663
3664 xs *headers = xs_dict_new();
3665 headers = xs_dict_append(headers, "content-type", "text/plain");
3666 // Append the Authorization header only if ntfy_token is not NULL
3667 if (ntfy_token != NULL) {
3668 headers = xs_dict_append(headers, "Authorization", xs_fmt("Bearer %s", ntfy_token));
3669 }
3670
3671 xs *rsp = xs_http_request("POST", url, headers,
3672 body, strlen(body), &status, NULL, NULL, 0);
3673 rsp = xs_free(rsp);
3674
3675 srv_debug(0, xs_fmt("ntfy post %d", status));
3676 }
3677 else
3678 if (strcmp(type, "purge") == 0) {
3679 srv_log(xs_dup("purge start"));
3680
3681 purge_all();
3682
3683 srv_log(xs_dup("purge end"));
3684 }
3685 else
3686 if (strcmp(type, "input") == 0) {
3687 const xs_dict *msg = xs_dict_get(q_item, "message");
3688 const xs_dict *req = xs_dict_get(q_item, "req");
3689 int retries = xs_number_get(xs_dict_get(q_item, "retries"));
3690
3691 /* do some instance-level checks */
3692 int r = process_input_message(NULL, msg, req);
3693
3694 if (r == 0) {
3695 /* transient error? retry */
3696 if (retries > queue_retry_max)
3697 srv_log(xs_fmt("shared input giving up"));
3698 else {
3699 /* reenqueue */
3700 enqueue_shared_input(msg, req, retries + 1);
3701 srv_log(xs_fmt("shared input requeue #%d", retries + 1));
3702 }
3703 }
3704 else
3705 if (r == 2) {
3706 /* redistribute the input message to all users */
3707 const char *ntid = xs_dict_get(q_item, "ntid");
3708 xs *tmpfn = xs_fmt("%s/tmp/%s.json", srv_basedir, ntid);
3709 FILE *f;
3710
3711 if ((f = fopen(tmpfn, "w")) != NULL) {
3712 xs_json_dump(q_item, 4, f);
3713 fclose(f);
3714 }
3715
3716 xs *users = user_list();
3717 xs_list *p = users;
3718 const char *v;
3719 int cnt = 0;
3720
3721 while (xs_list_iter(&p, &v)) {
3722 snac user;
3723
3724 if (user_open(&user, v)) {
3725 int rsn = is_msg_for_me(&user, msg);
3726 if (rsn) {
3727 xs *fn = xs_fmt("%s/queue/%s.json", user.basedir, ntid);
3728
3729 snac_debug(&user, 1,
3730 xs_fmt("enqueue_input (from shared inbox) %s [%d]", xs_dict_get(msg, "id"), rsn));
3731
3732 if (link(tmpfn, fn) < 0)
3733 srv_log(xs_fmt("link(%s, %s) error", tmpfn, fn));
3734
3735 cnt++;
3736 }
3737
3738 user_free(&user);
3739 }
3740 }
3741
3742 unlink(tmpfn);
3743
3744 if (cnt == 0) {
3745 srv_debug(1, xs_fmt("no valid recipients for %s", xs_dict_get(msg, "id")));
3746 }
3747 }
3748 }
3749 else
3750 if (strcmp(type, "webmention") == 0) {
3751 const xs_dict *msg = xs_dict_get(q_item, "message");
3752 const char *source = xs_dict_get(msg, "id");
3753 const char *content = xs_dict_get(msg, "content");
3754
3755 if (xs_is_string(source) && xs_is_string(content)) {
3756 xs *links = xs_regex_select(content, "\"https?:/" "/[^\"]+");
3757 const char *link;
3758
3759 xs_list_foreach(links, link) {
3760 xs *target = xs_strip_chars_i(xs_dup(link), "\"");
3761
3762 int r = xs_webmention_send(source, target, USER_AGENT);
3763
3764 srv_debug(1, xs_fmt("webmention source=%s target=%s %d", source, target, r));
3765 }
3766 }
3767 }
3768 else
3769 if (strcmp(type, "rss_hashtag_poll") == 0) {
3770 rss_poll_hashtags();
3771 }
3772 else
3773 if (strcmp(type, "fsck") == 0) {
3774 srv_log(xs_fmt("started deferred data integrity check"));
3775 data_fsck();
3776 srv_log(xs_fmt("finished deferred data integrity check"));
3777 }
3778 else
3779 srv_log(xs_fmt("unexpected q_item type '%s'", type));
3780}
3781
3782
3783int process_queue(void)
3784/* processes the global queue */
3785{
3786 int cnt = 0;
3787 xs *list = queue();
3788
3789 xs_list *p = list;
3790 const xs_str *fn;
3791
3792 while (xs_list_iter(&p, &fn)) {
3793 xs *q_item = dequeue(fn);
3794
3795 if (q_item != NULL) {
3796 job_post(q_item, 0);
3797 cnt++;
3798 }
3799 }
3800
3801 return cnt;
3802}
3803
3804
3805/** account migration **/
3806
3807int migrate_account(snac *user)
3808/* migrates this account to a new one (stored in the 'alias' user field) */
3809{
3810 const char *new_account = xs_dict_get(user->config, "alias");
3811
3812 if (xs_type(new_account) != XSTYPE_STRING) {
3813 snac_log(user, xs_fmt("Cannot migrate: alias (destination account) not set"));
3814 return 1;
3815 }
3816
3817 xs *new_actor = NULL;
3818 int status;
3819
3820 if (!valid_status(status = activitypub_request(user, new_account, &new_actor))) {
3821 snac_log(user, xs_fmt("Cannot migrate: error requesting actor %s %d", new_account, status));
3822 return 1;
3823 }
3824
3825 actor_add(new_account, new_actor);
3826
3827 const char *loaka = xs_dict_get(new_actor, "alsoKnownAs");
3828
3829 if (xs_type(loaka) != XSTYPE_LIST) {
3830 snac_log(user, xs_fmt("Cannot migrate: destination account doesn't have any aliases"));
3831 return 1;
3832 }
3833
3834 if (xs_list_in(loaka, user->actor) == -1) {
3835 snac_log(user, xs_fmt("Cannot migrate: destination account doesn't have this one as an alias"));
3836 return 1;
3837 }
3838
3839 xs *move = msg_move(user, new_account);
3840 xs *fwers = follower_list(user);
3841
3842 const char *actor;
3843 xs_list_foreach(fwers, actor) {
3844 /* get the actor inbox, excluding the shared one */
3845 xs *inbox = get_actor_inbox(actor, 0);
3846
3847 if (xs_is_null(inbox))
3848 snac_log(user, xs_fmt("migrate_account: cannot get inbox for actor %s", actor));
3849 else
3850 enqueue_output(user, move, inbox, 0, 0);
3851 }
3852
3853 return 0;
3854}
3855
3856
3857/** HTTP handlers */
3858
3859int activitypub_get_handler(const xs_dict *req, const char *q_path,
3860 char **body, int *b_size, char **ctype)
3861{
3862 int status = HTTP_STATUS_OK;
3863 const char *accept = xs_dict_get(req, "accept");
3864 snac snac;
3865 xs *msg = NULL;
3866
3867 if (accept == NULL)
3868 return 0;
3869
3870 if (xs_str_in(accept, "application/activity+json") == -1 &&
3871 xs_str_in(accept, "application/ld+json") == -1)
3872 return 0;
3873
3874 xs *l = xs_split_n(q_path, "/", 2);
3875 const char *uid;
3876 const char *p_path;
3877
3878 uid = xs_list_get(l, 1);
3879 if (!user_open(&snac, uid)) {
3880 /* invalid user */
3881 status = grave(uid, 0) ? HTTP_STATUS_GONE : HTTP_STATUS_NOT_FOUND;
3882 srv_debug(1, xs_fmt("activitypub_get_handler bad user %s %d", uid, status));
3883 return status;
3884 }
3885
3886 p_path = xs_list_get(l, 2);
3887
3888 const xs_dict *q_vars = xs_dict_get(req, "q_vars");
3889
3890 *ctype = "application/activity+json";
3891
3892 int show_contact_metrics = xs_is_true(xs_dict_get(snac.config, "show_contact_metrics"));
3893
3894 if (p_path == NULL) {
3895 /* if there was no component after the user, it's an actor request */
3896 msg = msg_actor(&snac);
3897 *ctype = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"";
3898
3899 const char *ua = xs_dict_get(req, "user-agent");
3900
3901 snac_debug(&snac, 0, xs_fmt("serving actor [%s]", ua ? ua : "No UA"));
3902 }
3903 else
3904 if (strcmp(p_path, "outbox") == 0 || strcmp(p_path, "featured") == 0) {
3905 xs *id = xs_fmt("%s/%s", snac.actor, p_path);
3906 xs *list = xs_list_new();
3907 const char *v;
3908 int cnt = xs_number_get(xs_dict_get_def(srv_config, "max_public_entries", "20"));
3909
3910 /* get the public outbox or the pinned list */
3911 xs *elems = *p_path == 'o' ? timeline_simple_list(&snac, "public", 0, cnt, NULL) : pinned_list(&snac);
3912
3913 xs_list_foreach(elems, v) {
3914 xs *i = NULL;
3915
3916 if (valid_status(object_get_by_md5(v, &i))) {
3917 const char *type = xs_dict_get(i, "type");
3918 const char *id = xs_dict_get(i, "id");
3919
3920 if (type && id && strcmp(type, "Note") == 0 && is_msg_mine(&snac, id)) {
3921 if (is_msg_public(i)) {
3922 xs *c_msg = msg_create(&snac, i);
3923 list = xs_list_append(list, c_msg);
3924 }
3925 }
3926 }
3927 }
3928
3929 /* replace the 'orderedItems' with the latest posts */
3930 msg = msg_collection(&snac, id, xs_list_len(list));
3931 msg = xs_dict_set(msg, "orderedItems", list);
3932 }
3933 else
3934 if (strcmp(p_path, "followers") == 0) {
3935 int total = 0;
3936
3937 if (show_contact_metrics) {
3938 total = follower_list_len(&snac);
3939 }
3940
3941 xs *id = xs_fmt("%s/%s", snac.actor, p_path);
3942 msg = msg_collection(&snac, id, total);
3943 }
3944 else
3945 if (strcmp(p_path, "following") == 0) {
3946 int total = 0;
3947
3948 if (show_contact_metrics) {
3949 total = following_list_len(&snac);
3950 }
3951
3952 xs *id = xs_fmt("%s/%s", snac.actor, p_path);
3953 msg = msg_collection(&snac, id, total);
3954 }
3955 else
3956 if (xs_startswith(p_path, "p/")) {
3957 xs *id = xs_fmt("%s/%s", snac.actor, p_path);
3958
3959 status = object_get(id, &msg);
3960
3961 /* don't return non-public objects */
3962 if (valid_status(status) && !is_msg_public(msg))
3963 status = HTTP_STATUS_NOT_FOUND;
3964 }
3965 else
3966 if (xs_startswith(p_path, "r/")) {
3967 /* replies to a post */
3968 xs *s = xs_dup(p_path);
3969 s[0] = 'p';
3970
3971 xs *id = xs_fmt("%s/%s", snac.actor, s);
3972
3973 xs *obj = NULL;
3974 status = object_get(id, &obj);
3975
3976 /* don't return non-public objects */
3977 if (!valid_status(status))
3978 status = HTTP_STATUS_NOT_FOUND;
3979 else
3980 if (!is_msg_public(obj))
3981 status = HTTP_STATUS_NOT_FOUND;
3982 else
3983 if (xs_dict_get(q_vars, "page"))
3984 msg = msg_replies(&snac, id, 1);
3985 else {
3986 const xs_dict *replies = xs_dict_get(obj, "replies");
3987 if (xs_is_dict(replies)) {
3988 msg = xs_dup(replies);
3989 msg = xs_dict_set(msg, "@context", "https:/""/www.w3.org/ns/activitystreams");
3990 }
3991 }
3992 }
3993 else
3994 status = HTTP_STATUS_NOT_FOUND;
3995
3996 if (status == HTTP_STATUS_OK && msg != NULL) {
3997 *body = xs_json_dumps(msg, 4);
3998 *b_size = strlen(*body);
3999 }
4000
4001 snac_debug(&snac, 1, xs_fmt("activitypub_get_handler serving %s %d", q_path, status));
4002
4003 user_free(&snac);
4004
4005 return status;
4006}
4007
4008
4009int activitypub_post_handler(const xs_dict *req, const char *q_path,
4010 char *payload, int p_size,
4011 char **body, int *b_size, char **ctype)
4012/* processes an input message */
4013{
4014 (void)b_size;
4015
4016 int status = HTTP_STATUS_ACCEPTED;
4017 const char *i_ctype = xs_dict_get(req, "content-type");
4018 snac snac;
4019 const char *v;
4020
4021 if (i_ctype == NULL) {
4022 *body = xs_str_new("no content-type");
4023 *ctype = "text/plain";
4024 return HTTP_STATUS_BAD_REQUEST;
4025 }
4026
4027 if (xs_is_null(payload)) {
4028 *body = xs_str_new("no payload");
4029 *ctype = "text/plain";
4030 return HTTP_STATUS_BAD_REQUEST;
4031 }
4032
4033 if (xs_str_in(i_ctype, "application/activity+json") == -1 &&
4034 xs_str_in(i_ctype, "application/ld+json") == -1)
4035 return 0;
4036
4037 /* decode the message */
4038 xs *msg = xs_json_loads(payload);
4039 const char *id = xs_dict_get(msg, "id");
4040
4041 if (msg == NULL) {
4042 srv_log(xs_fmt("activitypub_post_handler JSON error %s", q_path));
4043
4044 srv_archive_error("activitypub_post_handler", "JSON error", req, payload);
4045
4046 *body = xs_str_new("JSON error");
4047 *ctype = "text/plain";
4048 return HTTP_STATUS_BAD_REQUEST;
4049 }
4050
4051 if (id && is_instance_blocked(id)) {
4052 srv_debug(1, xs_fmt("full instance block for %s", id));
4053
4054 *body = xs_str_new("blocked");
4055 *ctype = "text/plain";
4056 return HTTP_STATUS_FORBIDDEN;
4057 }
4058
4059 /* get the user and path */
4060 xs *l = xs_split_n(q_path, "/", 2);
4061
4062 if (xs_list_len(l) == 2 && strcmp(xs_list_get(l, 1), "shared-inbox") == 0) {
4063 enqueue_shared_input(msg, req, 0);
4064 return HTTP_STATUS_ACCEPTED;
4065 }
4066
4067 if (xs_list_len(l) != 3 || strcmp(xs_list_get(l, 2), "inbox") != 0) {
4068 /* strange q_path */
4069 srv_debug(1, xs_fmt("activitypub_post_handler unsupported path %s", q_path));
4070 return HTTP_STATUS_NOT_FOUND;
4071 }
4072
4073 const char *uid = xs_list_get(l, 1);
4074 if (!user_open(&snac, uid)) {
4075 /* invalid user */
4076 status = grave(uid, 0) ? HTTP_STATUS_GONE : HTTP_STATUS_NOT_FOUND;
4077 srv_debug(1, xs_fmt("activitypub_post_handler bad user %s %d", uid, status));
4078 return status;
4079 }
4080
4081 /* if it has a digest, check it now, because
4082 later the payload won't be exactly the same */
4083 if ((v = xs_dict_get(req, "digest")) != NULL) {
4084 xs *s1 = xs_sha256_base64(payload, p_size);
4085 xs *s2 = xs_fmt("SHA-256=%s", s1);
4086
4087 if (strcmp(s2, v) != 0) {
4088 srv_log(xs_fmt("digest check FAILED"));
4089
4090 *body = xs_str_new("bad digest");
4091 *ctype = "text/plain";
4092 status = HTTP_STATUS_BAD_REQUEST;
4093 }
4094 }
4095
4096 /* if the message is from a muted actor, reject it right now */
4097 if (!xs_is_null(v = xs_dict_get(msg, "actor")) && *v) {
4098 if (is_muted(&snac, v)) {
4099 snac_log(&snac, xs_fmt("rejected message from MUTEd actor %s", v));
4100
4101 *body = xs_str_new("rejected");
4102 *ctype = "text/plain";
4103 status = HTTP_STATUS_FORBIDDEN;
4104 }
4105 }
4106
4107 if (valid_status(status)) {
4108 enqueue_input(&snac, msg, req, 0);
4109 *ctype = "application/activity+json";
4110 }
4111
4112 user_free(&snac);
4113
4114 return status;
4115}
