/* snac - A simple, minimalistic ActivityPub instance */ /* copyright (c) 2022 - 2024 grunfink et al. / MIT license */ #include "xs.h" #include "xs_json.h" #include "xs_curl.h" #include "xs_mime.h" #include "xs_openssl.h" #include "xs_regex.h" #include "xs_time.h" #include "xs_set.h" #include "xs_match.h" #include "snac.h" #include const char *public_address = "https:/" "/www.w3.org/ns/activitystreams#Public"; /* susie.png */ const char *susie = "iVBORw0KGgoAAAANSUhEUgAAAEAAAABAAQAAAAC" "CEkxzAAAAUUlEQVQoz43R0QkAMQwCUDdw/y3dwE" "vsvzlL4X1IoQkAisKmwfAFT3RgJHbQezpSRoXEq" "eqCL9BJBf7h3QbOCCxV5EVWMEMwG7K1/WODtlvx" "AYTtEsDU9F34AAAAAElFTkSuQmCC"; const char *susie_cool = "iVBORw0KGgoAAAANSUhEUgAAAEAAAABAAQAAAAC" "CEkxzAAAAV0lEQVQoz43RwQ3AMAwCQDZg/y3ZgN" "qo3+JaedwDOUQBQFHYaTB8wTM6sGl2cMPu+DFzn" "+ZcgN7wF7ZVihXkfSlWIVzIA6dbQzaygllpNuTX" "ZmmFNlvxADX1+o0cUPMbAAAAAElFTkSuQmCC"; const char *susie_muertos = "iVBORw0KGgoAAAANSUhEUgAAAEAAAABAAQAAAAC" "CEkxzAAAAV0lEQVQoz4XQsQ0AMQxCUW/A/lv+DT" "ic6zGRolekIMyMELNp8PiCEw6Q4w4NoAt53IH5m" "xXksrZYgZwJrIox+Z8vJAfe2lCxG6AK7eKkWcEb" "QHbF617xAQatAAD7jJHUAAAAAElFTkSuQmCC"; const char *default_avatar_base64(void) /* returns the default avatar in base64 */ { time_t t = time(NULL); struct tm tm; const char *p = susie; gmtime_r(&t, &tm); if (tm.tm_mon == 10 && tm.tm_mday == 2) p = susie_muertos; else if (tm.tm_wday == 0 || tm.tm_wday == 6) p = susie_cool; return p; } int activitypub_request(snac *user, const char *url, xs_dict **data) /* request an object */ { int status = 0; xs *response = NULL; xs *payload = NULL; int p_size; const char *ctype; *data = NULL; if (user != NULL) { /* get from the net */ response = http_signed_request(user, "GET", url, NULL, NULL, 0, &status, &payload, &p_size, 0); } if (status == 0 || (status >= 500 && status <= 599)) { /* I found an instance running Misskey that returned 500 on signed messages but returned the object perfectly without signing (?), so why not try */ xs_free(response); xs *hdrs = xs_dict_new(); hdrs = xs_dict_append(hdrs, "accept", "application/activity+json"); hdrs = xs_dict_append(hdrs, "user-agent", USER_AGENT); response = xs_http_request("GET", url, hdrs, NULL, 0, &status, &payload, &p_size, 0); } if (valid_status(status)) { /* ensure it's ActivityPub data */ ctype = xs_dict_get(response, "content-type"); if (xs_is_null(ctype)) status = HTTP_STATUS_BAD_REQUEST; else if (xs_str_in(ctype, "application/activity+json") != -1 || xs_str_in(ctype, "application/ld+json") != -1) { /* if there is no payload, fail */ if (xs_is_null(payload)) status = HTTP_STATUS_BAD_REQUEST; else *data = xs_json_loads(payload); } else status = HTTP_STATUS_INTERNAL_SERVER_ERROR; } return status; } int actor_request(snac *user, const char *actor, xs_dict **data) /* request an actor */ { int status; xs *payload = NULL; if (data) *data = NULL; /* get from disk first */ status = actor_get_refresh(user, actor, data); if (!valid_status(status)) { /* actor data non-existent: get from the net */ status = activitypub_request(user, actor, &payload); if (valid_status(status)) { /* renew data */ status = actor_add(actor, payload); if (data != NULL) { *data = payload; payload = NULL; } } else srv_debug(1, xs_fmt("actor_request error %s %d", actor, status)); } /* collect the (presumed) shared inbox in this actor */ if (xs_type(xs_dict_get(srv_config, "disable_inbox_collection")) != XSTYPE_TRUE) { if (valid_status(status) && data && *data) inbox_add_by_actor(*data); } return status; } const char *get_atto(const xs_dict *msg) /* gets the attributedTo field (an actor) */ { const xs_val *actor = xs_dict_get(msg, "attributedTo"); /* if the actor is a list of objects (like on Peertube videos), pick the Person */ if (xs_type(actor) == XSTYPE_LIST) { const xs_list *p = actor; int c = 0; const xs_dict *v; actor = NULL; while (actor == NULL && xs_list_next(p, &v, &c)) { if (xs_type(v) == XSTYPE_DICT) { const char *type = xs_dict_get(v, "type"); if (xs_type(type) == XSTYPE_STRING && strcmp(type, "Person") == 0) { actor = xs_dict_get(v, "id"); if (xs_type(actor) != XSTYPE_STRING) actor = NULL; } } } } return actor; } xs_list *get_attachments(const xs_dict *msg) /* unify the garbage fire that are the attachments */ { xs_list *l = xs_list_new(); const xs_list *p; /* try first the attachments list */ if (!xs_is_null(p = xs_dict_get(msg, "attachment"))) { xs *attach = NULL; const xs_val *v; /* ensure it's a list */ if (xs_type(p) == XSTYPE_DICT) { attach = xs_list_new(); attach = xs_list_append(attach, p); } else attach = xs_dup(p); if (xs_type(attach) == XSTYPE_LIST) { /* does the message have an image? */ const xs_dict *d = xs_dict_get(msg, "image"); if (xs_type(d) == XSTYPE_DICT) { /* add it to the attachment list */ attach = xs_list_append(attach, d); } } /* now iterate the list */ int c = 0; while (xs_list_next(attach, &v, &c)) { const char *type = xs_dict_get(v, "mediaType"); if (xs_is_null(type)) type = xs_dict_get(v, "type"); if (xs_is_null(type)) continue; const char *href = xs_dict_get(v, "url"); if (xs_is_null(href)) href = xs_dict_get(v, "href"); if (xs_is_null(href)) continue; /* infer MIME type from non-specific attachments */ if (xs_list_len(attach) < 2 && xs_match(type, "Link|Document")) { char *mt = (char *)xs_mime_by_ext(href); if (xs_match(mt, "image/*|audio/*|video/*")) /* */ type = mt; } const char *name = xs_dict_get(v, "name"); if (xs_is_null(name)) name = xs_dict_get(msg, "name"); if (xs_is_null(name)) name = ""; xs *d = xs_dict_new(); d = xs_dict_append(d, "type", type); d = xs_dict_append(d, "href", href); d = xs_dict_append(d, "name", name); l = xs_list_append(l, d); } } /** urls (attachments from Peertube) **/ p = xs_dict_get(msg, "url"); if (xs_type(p) == XSTYPE_LIST) { const char *href = NULL; const char *type = NULL; int c = 0; const xs_val *v; while (href == NULL && xs_list_next(p, &v, &c)) { if (xs_type(v) == XSTYPE_DICT) { const char *mtype = xs_dict_get(v, "type"); if (xs_type(mtype) == XSTYPE_STRING && strcmp(mtype, "Link") == 0) { mtype = xs_dict_get(v, "mediaType"); const xs_list *tag = xs_dict_get(v, "tag"); if (xs_type(mtype) == XSTYPE_STRING && strcmp(mtype, "application/x-mpegURL") == 0 && xs_type(tag) == XSTYPE_LIST) { /* now iterate the tag list, looking for a video URL */ const xs_dict *d; int c = 0; while (href == NULL && xs_list_next(tag, &d, &c)) { if (xs_type(d) == XSTYPE_DICT) { if (xs_type(mtype = xs_dict_get(d, "mediaType")) == XSTYPE_STRING && xs_startswith(mtype, "video/")) { const char *h = xs_dict_get(d, "href"); /* this is probably it */ if (xs_type(h) == XSTYPE_STRING) { href = h; type = mtype; } } } } } } } } if (href && type) { xs *d = xs_dict_new(); d = xs_dict_append(d, "href", href); d = xs_dict_append(d, "type", type); d = xs_dict_append(d, "name", "---"); l = xs_list_append(l, d); } } return l; } int timeline_request(snac *snac, const char **id, xs_str **wrk, int level) /* ensures that an entry and its ancestors are in the timeline */ { int status = 0; if (level < MAX_CONVERSATION_LEVELS && !xs_is_null(*id)) { xs *msg = NULL; /* from a blocked instance? discard and break */ if (is_instance_blocked(*id)) { snac_debug(snac, 1, xs_fmt("timeline_request blocked instance %s", *id)); return status; } /* is the object already there? */ if (!valid_status(object_get(*id, &msg))) { /* no; download it */ status = activitypub_request(snac, *id, &msg); if (valid_status(status)) { const xs_dict *object = msg; const char *type = xs_dict_get(object, "type"); /* get the id again from the object, as it may be different */ const char *nid = xs_dict_get(object, "id"); if (xs_type(nid) != XSTYPE_STRING) return 0; if (wrk && strcmp(nid, *id) != 0) { snac_debug(snac, 1, xs_fmt("timeline_request canonical id for %s is %s", *id, nid)); *wrk = xs_dup(nid); *id = *wrk; } if (xs_is_null(type)) type = "(null)"; srv_debug(2, xs_fmt("timeline_request type %s '%s'", nid, type)); if (strcmp(type, "Create") == 0) { /* some software like lemmy nest Announce + Create + Note */ if (!xs_is_null(object = xs_dict_get(object, "object"))) { type = xs_dict_get(object, "type"); nid = xs_dict_get(object, "id"); } else type = "(null)"; } if (xs_match(type, POSTLIKE_OBJECT_TYPE)) { if (content_match("filter_reject.txt", object)) snac_log(snac, xs_fmt("timeline_request rejected by content %s", nid)); else { const char *actor = get_atto(object); if (!xs_is_null(actor)) { /* request (and drop) the actor for this entry */ if (!valid_status(actor_request(snac, actor, NULL))) { /* failed? retry later */ enqueue_actor_refresh(snac, actor, 60); } /* does it have an ancestor? */ const char *in_reply_to = xs_dict_get(object, "inReplyTo"); /* store */ timeline_add(snac, nid, object); /* recurse! */ timeline_request(snac, &in_reply_to, NULL, level + 1); } } } } } } return status; } int send_to_inbox_raw(const char *keyid, const char *seckey, const xs_str *inbox, const xs_dict *msg, xs_val **payload, int *p_size, int timeout) /* sends a message to an Inbox */ { int status; xs_dict *response; xs *j_msg = xs_json_dumps((xs_dict *)msg, 4); response = http_signed_request_raw(keyid, seckey, "POST", inbox, NULL, j_msg, strlen(j_msg), &status, payload, p_size, timeout); xs_free(response); return status; } int send_to_inbox(snac *snac, const xs_str *inbox, const xs_dict *msg, xs_val **payload, int *p_size, int timeout) /* sends a message to an Inbox */ { const char *seckey = xs_dict_get(snac->key, "secret"); return send_to_inbox_raw(snac->actor, seckey, inbox, msg, payload, p_size, timeout); } xs_str *get_actor_inbox(const char *actor) /* gets an actor's inbox */ { xs *data = NULL; const char *v = NULL; if (valid_status(actor_request(NULL, actor, &data))) { /* try first endpoints/sharedInbox */ if ((v = xs_dict_get(data, "endpoints"))) v = xs_dict_get(v, "sharedInbox"); /* try then the regular inbox */ if (xs_is_null(v)) v = xs_dict_get(data, "inbox"); } return xs_is_null(v) ? NULL : xs_dup(v); } int send_to_actor(snac *snac, const char *actor, const xs_dict *msg, xs_val **payload, int *p_size, int timeout) /* sends a message to an actor */ { int status = HTTP_STATUS_BAD_REQUEST; xs *inbox = get_actor_inbox(actor); if (!xs_is_null(inbox)) status = send_to_inbox(snac, inbox, msg, payload, p_size, timeout); return status; } void post_message(snac *snac, const char *actor, const xs_dict *msg) /* posts a message immediately (bypassing the output queues) */ { xs *payload = NULL; int p_size; int status = send_to_actor(snac, actor, msg, &payload, &p_size, 3); srv_log(xs_fmt("post_message to actor %s %d", actor, status)); if (!valid_status(status)) /* cannot send right now, enqueue */ enqueue_message(snac, msg); } xs_list *recipient_list(snac *snac, const xs_dict *msg, int expand_public) /* returns the list of recipients for a message */ { const xs_val *to = xs_dict_get(msg, "to"); const xs_val *cc = xs_dict_get(msg, "cc"); xs_set rcpts; int n; xs_set_init(&rcpts); const xs_list *lists[] = { to, cc, NULL }; for (n = 0; lists[n]; n++) { xs_list *l = (xs_list *)lists[n]; const char *v; xs *tl = NULL; /* if it's a string, create a list with only one element */ if (xs_type(l) == XSTYPE_STRING) { tl = xs_list_new(); tl = xs_list_append(tl, l); l = tl; } while (xs_list_iter(&l, &v)) { if (expand_public && strcmp(v, public_address) == 0) { /* iterate the followers and add them */ xs *fwers = follower_list(snac); const char *actor; char *p = fwers; while (xs_list_iter(&p, &actor)) xs_set_add(&rcpts, actor); } else xs_set_add(&rcpts, v); } } return xs_set_result(&rcpts); } int is_msg_public(const xs_dict *msg) /* checks if a message is public */ { const char *to = xs_dict_get(msg, "to"); const char *cc = xs_dict_get(msg, "cc"); int n; const char *lists[] = { to, cc, NULL }; for (n = 0; lists[n]; n++) { const xs_val *l = lists[n]; if (xs_type(l) == XSTYPE_STRING) { if (strcmp(l, public_address) == 0) return 1; } else if (xs_type(l) == XSTYPE_LIST) { if (xs_list_in(l, public_address) != -1) return 1; } } return 0; } int is_msg_from_private_user(const xs_dict *msg) /* checks if a message is from a local, private user */ { int ret = 0; /* is this message from a local user? */ if (xs_startswith(xs_dict_get(msg, "id"), srv_baseurl)) { const char *atto = get_atto(msg); xs *l = xs_split(atto, "/"); const char *uid = xs_list_get(l, -1); snac user; if (uid && user_open(&user, uid)) { if (xs_type(xs_dict_get(user.config, "private")) == XSTYPE_TRUE) ret = 1; user_free(&user); } } return ret; } int is_msg_for_me(snac *snac, const xs_dict *c_msg) /* checks if this message is for me */ { const char *type = xs_dict_get(c_msg, "type"); const char *actor = xs_dict_get(c_msg, "actor"); if (strcmp(actor, snac->actor) == 0) { /* message by myself? (most probably via the shared-inbox) reject */ snac_debug(snac, 1, xs_fmt("ignoring message by myself")); return 0; } if (xs_match(type, "Like|Announce")) { const char *object = xs_dict_get(c_msg, "object"); if (xs_type(object) == XSTYPE_DICT) object = xs_dict_get(object, "id"); /* bad object id? reject */ if (xs_type(object) != XSTYPE_STRING) return 0; /* if it's about one of our posts, accept it */ if (xs_startswith(object, snac->actor)) return 2; /* if it's by someone we don't follow, reject */ return following_check(snac, actor); } /* if it's an Undo, it must be from someone related to us */ if (xs_match(type, "Undo")) { return follower_check(snac, actor) || following_check(snac, actor); } /* if it's an Accept + Follow, it must be for a Follow we created */ if (xs_match(type, "Accept")) { return following_check(snac, actor); } /* if it's a Follow, it must be explicitly for us */ if (xs_match(type, "Follow")) { const char *object = xs_dict_get(c_msg, "object"); return !xs_is_null(object) && strcmp(snac->actor, object) == 0; } /* only accept Ping directed to us */ if (xs_match(type, "Ping")) { const char *dest = xs_dict_get(c_msg, "to"); return !xs_is_null(dest) && strcmp(snac->actor, dest) == 0; } /* if it's not a Create or Update, allow as is */ if (!xs_match(type, "Create|Update")) { return 1; } int pub_msg = is_msg_public(c_msg); /* if this message is public and we follow the actor of this post, allow */ if (pub_msg && following_check(snac, actor)) return 1; const xs_dict *msg = xs_dict_get(c_msg, "object"); xs *rcpts = recipient_list(snac, msg, 0); xs_list *p = rcpts; const xs_str *v; xs *actor_followers = NULL; if (!pub_msg) { /* not a public message; get the actor and its followers list */ xs *actor_obj = NULL; if (valid_status(object_get(actor, &actor_obj))) { const xs_val *fw = xs_dict_get(actor_obj, "followers"); if (fw) actor_followers = xs_dup(fw); } } while(xs_list_iter(&p, &v)) { /* explicitly for me? accept */ if (strcmp(v, snac->actor) == 0) return 2; if (pub_msg) { /* a public message for someone we follow? (probably cc'ed) accept */ if (following_check(snac, v)) return 5; } else if (actor_followers && strcmp(v, actor_followers) == 0) { /* if this message is for this actor's followers, are we one of them? */ if (following_check(snac, actor)) return 6; } } /* accept if it's by someone we follow */ const char *atto = get_atto(msg); if (pub_msg && !xs_is_null(atto) && following_check(snac, atto)) return 3; /* is this message a reply to another? */ const char *irt = xs_dict_get(msg, "inReplyTo"); if (!xs_is_null(irt)) { xs *r_msg = NULL; /* try to get the replied message */ if (valid_status(object_get(irt, &r_msg))) { atto = get_atto(r_msg); /* accept if the replied message is from someone we follow */ if (pub_msg && !xs_is_null(atto) && following_check(snac, atto)) return 4; } } return 0; } xs_str *process_tags(snac *snac, const char *content, xs_list **tag) /* parses mentions and tags from content */ { xs_str *nc = xs_str_new(NULL); xs_list *tl = *tag; xs *split; xs_list *p; const xs_val *v; int n = 0; /* create a default server for incomplete mentions */ xs *def_srv = NULL; if (xs_list_len(tl)) { /* if there are any mentions, get the server from the first one, which is the inReplyTo author */ p = tl; while (xs_list_iter(&p, &v)) { const char *type = xs_dict_get(v, "type"); const char *name = xs_dict_get(v, "name"); if (type && name && strcmp(type, "Mention") == 0) { xs *l = xs_split(name, "@"); def_srv = xs_dup(xs_list_get(l, -1)); break; } } } if (xs_is_null(def_srv)) /* use this same server */ def_srv = xs_dup(xs_dict_get(srv_config, "host")); split = xs_regex_split(content, "(@[A-Za-z0-9_]+(@[A-Za-z0-9\\.-]+)?|&#[0-9]+;|#[^ ,\\.:;<]+)"); p = split; while (xs_list_iter(&p, &v)) { if ((n & 0x1)) { if (*v == '@') { xs *link = NULL; xs *wuid = NULL; if (strchr(v + 1, '@') == NULL) { /* only one @? it's a dumb Mastodon-like mention without server; add the default one */ wuid = xs_fmt("%s@%s", v, def_srv); snac_debug(snac, 2, xs_fmt("mention without server '%s' '%s'", v, wuid)); } else wuid = xs_dup(v); /* query the webfinger about this fellow */ xs *actor = NULL; xs *uid = NULL; int status; status = webfinger_request(wuid, &actor, &uid); if (valid_status(status) && actor && uid) { xs *d = xs_dict_new(); xs *n = xs_fmt("@%s", uid); d = xs_dict_append(d, "type", "Mention"); d = xs_dict_append(d, "href", actor); d = xs_dict_append(d, "name", n); tl = xs_list_append(tl, d); link = xs_fmt("%s", actor, n); } if (!xs_is_null(link)) nc = xs_str_cat(nc, link); else nc = xs_str_cat(nc, v); } else if (*v == '#') { /* hashtag */ xs *d = xs_dict_new(); xs *n = xs_tolower_i(xs_dup(v)); xs *h = xs_fmt("%s?t=%s", srv_baseurl, n + 1); xs *l = xs_fmt("%s", h, v); d = xs_dict_append(d, "type", "Hashtag"); d = xs_dict_append(d, "href", h); d = xs_dict_append(d, "name", n); tl = xs_list_append(tl, d); /* add the code */ nc = xs_str_cat(nc, l); } else if (*v == '&') { /* HTML Unicode entity, probably part of an emoji */ /* write as is */ nc = xs_str_cat(nc, v); } } else nc = xs_str_cat(nc, v); n++; } *tag = tl; return nc; } void notify(snac *snac, const char *type, const char *utype, const char *actor, const xs_dict *msg) /* notifies the user of relevant events */ { /* skip our own notifications */ if (strcmp(snac->actor, actor) == 0) return; const char *id = xs_dict_get(msg, "id"); if (strcmp(type, "Create") == 0) { /* only notify of notes specifically for us */ xs *rcpts = recipient_list(snac, msg, 0); if (xs_list_in(rcpts, snac->actor) == -1) return; /* discard votes */ const xs_dict *note = xs_dict_get(msg, "object"); if (note && !xs_is_null(xs_dict_get(note, "name"))) return; } if (strcmp(type, "Undo") == 0 && strcmp(utype, "Follow") != 0) return; /* get the object id */ const char *objid = xs_dict_get(msg, "object"); if (xs_type(objid) == XSTYPE_DICT) objid = xs_dict_get(objid, "id"); if (strcmp(type, "Like") == 0 || strcmp(type, "Announce") == 0) { /* if it's not an admiration about something by us, done */ if (xs_is_null(objid) || !xs_startswith(objid, snac->actor)) return; } /* updated poll? */ if (strcmp(type, "Update") == 0 && strcmp(utype, "Question") == 0) { const xs_dict *poll; const char *poll_id; if ((poll = xs_dict_get(msg, "object")) == NULL) return; /* if it's not closed, discard */ if (xs_is_null(xs_dict_get(poll, "closed"))) return; if ((poll_id = xs_dict_get(poll, "id")) == NULL) return; /* if it's not ours and we didn't vote, discard */ if (!xs_startswith(poll_id, snac->actor) && !was_question_voted(snac, poll_id)) return; } /* user will love to know about this! */ /* prepare message body */ xs *body = xs_fmt("User : @%s@%s\n", xs_dict_get(snac->config, "uid"), xs_dict_get(srv_config, "host") ); if (strcmp(utype, "(null)") != 0) { xs *s1 = xs_fmt("Type : %s + %s\n", type, utype); body = xs_str_cat(body, s1); } else { xs *s1 = xs_fmt("Type : %s\n", type); body = xs_str_cat(body, s1); } { xs *s1 = xs_fmt("Actor : %s\n", actor); body = xs_str_cat(body, s1); } if (objid != NULL) { xs *s1 = xs_fmt("Object: %s\n", objid); body = xs_str_cat(body, s1); } /* email */ const char *email = "[disabled by admin]"; if (xs_type(xs_dict_get(srv_config, "disable_email_notifications")) != XSTYPE_TRUE) { email = xs_dict_get(snac->config_o, "email"); if (xs_is_null(email)) { email = xs_dict_get(snac->config, "email"); if (xs_is_null(email)) email = "[empty]"; } } if (*email != '\0' && *email != '[') { snac_debug(snac, 1, xs_fmt("email notify %s %s %s", type, utype, actor)); xs *subject = xs_fmt("snac notify for @%s@%s", xs_dict_get(snac->config, "uid"), xs_dict_get(srv_config, "host")); xs *from = xs_fmt("snac-daemon ", xs_dict_get(srv_config, "host")); xs *header = xs_fmt( "From: %s\n" "To: %s\n" "Subject: %s\n" "\n", from, email, subject); xs *email_body = xs_fmt("%s%s", header, body); enqueue_email(email_body, 0); } /* telegram */ const char *bot = xs_dict_get(snac->config, "telegram_bot"); const char *chat_id = xs_dict_get(snac->config, "telegram_chat_id"); if (!xs_is_null(bot) && !xs_is_null(chat_id) && *bot && *chat_id) enqueue_telegram(body, bot, chat_id); /* ntfy */ const char *ntfy_server = xs_dict_get(snac->config, "ntfy_server"); const char *ntfy_token = xs_dict_get(snac->config, "ntfy_token"); if (!xs_is_null(ntfy_server) && *ntfy_server) enqueue_ntfy(body, ntfy_server, ntfy_token); /* auto boost */ if (xs_match(type, "Create") && xs_is_true(xs_dict_get(snac->config, "auto_boost"))) { xs *msg = msg_admiration(snac, objid, "Announce"); enqueue_message(snac, msg); snac_debug(snac, 1, xs_fmt("auto boosted %s", objid)); } /* finally, store it in the notification folder */ if (strcmp(type, "Follow") == 0) objid = id; else if (strcmp(utype, "Follow") == 0) objid = actor; notify_add(snac, type, utype, actor, objid != NULL ? objid : id, msg); } /** messages **/ xs_dict *msg_base(snac *snac, const char *type, const char *id, const char *actor, const char *date, const char *object) /* creates a base ActivityPub message */ { xs *did = NULL; xs *published = NULL; xs *ntid = tid(0); const char *obj_id; if (xs_type(object) == XSTYPE_DICT) obj_id = xs_dict_get(object, "id"); else obj_id = object; /* generated values */ if (date && strcmp(date, "@now") == 0) { published = xs_str_utctime(0, ISO_DATE_SPEC); date = published; } if (id != NULL) { if (strcmp(id, "@dummy") == 0) { did = xs_fmt("%s/d/%s/%s", snac->actor, ntid, type); id = did; } else if (strcmp(id, "@object") == 0) { if (obj_id != NULL) { did = xs_fmt("%s/%s_%s", obj_id, type, ntid); id = did; } else id = NULL; } else if (strcmp(id, "@wrapper") == 0) { /* like @object, but always generate the same id */ if (object != NULL) { date = xs_dict_get(object, "published"); did = xs_fmt("%s/%s", obj_id, type); id = did; } else id = NULL; } } xs_dict *msg = xs_dict_new(); msg = xs_dict_append(msg, "@context", "https:/" "/www.w3.org/ns/activitystreams"); msg = xs_dict_append(msg, "type", type); if (id != NULL) msg = xs_dict_append(msg, "id", id); if (actor != NULL) msg = xs_dict_append(msg, "actor", actor); if (date != NULL) msg = xs_dict_append(msg, "published", date); if (object != NULL) msg = xs_dict_append(msg, "object", object); return msg; } xs_dict *msg_collection(snac *snac, const char *id) /* creates an empty OrderedCollection message */ { xs_dict *msg = msg_base(snac, "OrderedCollection", id, NULL, NULL, NULL); xs *ol = xs_list_new(); msg = xs_dict_append(msg, "attributedTo", snac->actor); msg = xs_dict_append(msg, "orderedItems", ol); msg = xs_dict_append(msg, "totalItems", xs_stock(0)); return msg; } xs_dict *msg_accept(snac *snac, const xs_val *object, const char *to) /* creates an Accept message (as a response to a Follow) */ { xs_dict *msg = msg_base(snac, "Accept", "@dummy", snac->actor, NULL, object); msg = xs_dict_append(msg, "to", to); return msg; } xs_dict *msg_update(snac *snac, const xs_dict *object) /* creates an Update message */ { xs_dict *msg = msg_base(snac, "Update", "@object", snac->actor, "@now", object); const char *type = xs_dict_get(object, "type"); if (strcmp(type, "Note") == 0) { msg = xs_dict_append(msg, "to", xs_dict_get(object, "to")); msg = xs_dict_append(msg, "cc", xs_dict_get(object, "cc")); } else if (strcmp(type, "Person") == 0) { msg = xs_dict_append(msg, "to", public_address); /* also spam the people being followed, so that they have the newest information about who we are */ xs *cc = following_list(snac); msg = xs_dict_append(msg, "cc", cc); } else msg = xs_dict_append(msg, "to", public_address); return msg; } xs_dict *msg_admiration(snac *snac, const char *object, const char *type) /* creates a Like or Announce message */ { xs *a_msg = NULL; xs_dict *msg = NULL; xs *wrk = NULL; /* call the object */ timeline_request(snac, &object, &wrk, 0); if (valid_status(object_get(object, &a_msg))) { xs *rcpts = xs_list_new(); xs *o_md5 = xs_md5_hex(object, strlen(object)); xs *id = xs_fmt("%s/%s/%s", snac->actor, *type == 'L' ? "l" : "a", o_md5); msg = msg_base(snac, type, id, snac->actor, "@now", object); if (is_msg_public(a_msg)) rcpts = xs_list_append(rcpts, public_address); rcpts = xs_list_append(rcpts, get_atto(a_msg)); msg = xs_dict_append(msg, "to", rcpts); } else snac_log(snac, xs_fmt("msg_admiration cannot retrieve object %s", object)); return msg; } xs_dict *msg_repulsion(snac *user, const char *id, const char *type) /* creates an Undo + admiration message */ { xs *a_msg = NULL; xs_dict *msg = NULL; if (valid_status(object_get(id, &a_msg))) { /* create a clone of the original admiration message */ xs *object = msg_admiration(user, id, type); /* delete the published date */ object = xs_dict_del(object, "published"); /* create an undo message for this object */ msg = msg_undo(user, object); /* copy the 'to' field */ msg = xs_dict_set(msg, "to", xs_dict_get(object, "to")); } /* now we despise this */ object_unadmire(id, user->actor, *type == 'L' ? 1 : 0); return msg; } xs_dict *msg_actor(snac *snac) /* create a Person message for this actor */ { xs *ctxt = xs_list_new(); xs *icon = xs_dict_new(); xs *keys = xs_dict_new(); xs *tags = xs_list_new(); xs *avtr = NULL; xs *kid = NULL; xs *f_bio = NULL; xs_dict *msg = msg_base(snac, "Person", snac->actor, NULL, NULL, NULL); const char *p; int n; /* change the @context (is this really necessary?) */ ctxt = xs_list_append(ctxt, "https:/" "/www.w3.org/ns/activitystreams"); ctxt = xs_list_append(ctxt, "https:/" "/w3id.org/security/v1"); msg = xs_dict_set(msg, "@context", ctxt); msg = xs_dict_set(msg, "url", snac->actor); msg = xs_dict_set(msg, "name", xs_dict_get(snac->config, "name")); msg = xs_dict_set(msg, "preferredUsername", snac->uid); msg = xs_dict_set(msg, "published", xs_dict_get(snac->config, "published")); xs *f_bio_2 = not_really_markdown(xs_dict_get(snac->config, "bio"), NULL, NULL); f_bio = process_tags(snac, f_bio_2, &tags); msg = xs_dict_set(msg, "summary", f_bio); msg = xs_dict_set(msg, "tag", tags); char *folders[] = { "inbox", "outbox", "followers", "following", NULL }; for (n = 0; folders[n]; n++) { xs *f = xs_fmt("%s/%s", snac->actor, folders[n]); msg = xs_dict_set(msg, folders[n], f); } p = xs_dict_get(snac->config, "avatar"); if (*p == '\0') avtr = xs_fmt("%s/susie.png", srv_baseurl); else avtr = xs_dup(p); icon = xs_dict_append(icon, "type", "Image"); icon = xs_dict_append(icon, "mediaType", xs_mime_by_ext(avtr)); icon = xs_dict_append(icon, "url", avtr); msg = xs_dict_set(msg, "icon", icon); kid = xs_fmt("%s#main-key", snac->actor); keys = xs_dict_append(keys, "id", kid); keys = xs_dict_append(keys, "owner", snac->actor); keys = xs_dict_append(keys, "publicKeyPem", xs_dict_get(snac->key, "public")); msg = xs_dict_set(msg, "publicKey", keys); /* if the "bot" config field is set to true, change type to "Service" */ if (xs_type(xs_dict_get(snac->config, "bot")) == XSTYPE_TRUE) msg = xs_dict_set(msg, "type", "Service"); /* add the header image, if there is one defined */ const char *header = xs_dict_get(snac->config, "header"); if (!xs_is_null(header)) { xs *d = xs_dict_new(); d = xs_dict_append(d, "type", "Image"); d = xs_dict_append(d, "mediaType", xs_mime_by_ext(header)); d = xs_dict_append(d, "url", header); msg = xs_dict_set(msg, "image", d); } /* add the metadata as attachments of PropertyValue */ const xs_dict *metadata = xs_dict_get(snac->config, "metadata"); if (xs_type(metadata) == XSTYPE_DICT) { xs *attach = xs_list_new(); const xs_str *k; const xs_str *v; int c = 0; while (xs_dict_next(metadata, &k, &v, &c)) { xs *d = xs_dict_new(); xs *k2 = encode_html(k); xs *v2 = NULL; if (xs_startswith(v, "https:/") || xs_startswith(v, "http:/")) { xs *t = encode_html(v); v2 = xs_fmt("%s", t, t); } else v2 = encode_html(v); d = xs_dict_append(d, "type", "PropertyValue"); d = xs_dict_append(d, "name", k2); d = xs_dict_append(d, "value", v2); attach = xs_list_append(attach, d); } msg = xs_dict_set(msg, "attachment", attach); } /* use shared inboxes? */ if (xs_type(xs_dict_get(srv_config, "shared_inboxes")) == XSTYPE_TRUE) { xs *d = xs_dict_new(); xs *si = xs_fmt("%s/shared-inbox", srv_baseurl); d = xs_dict_append(d, "sharedInbox", si); msg = xs_dict_set(msg, "endpoints", d); } return msg; } xs_dict *msg_create(snac *snac, const xs_dict *object) /* creates a 'Create' message */ { xs_dict *msg = msg_base(snac, "Create", "@wrapper", snac->actor, NULL, object); const xs_val *v; if ((v = get_atto(object))) msg = xs_dict_append(msg, "attributedTo", v); if ((v = xs_dict_get(object, "cc"))) msg = xs_dict_append(msg, "cc", v); if ((v = xs_dict_get(object, "to"))) msg = xs_dict_append(msg, "to", v); else msg = xs_dict_append(msg, "to", public_address); return msg; } xs_dict *msg_undo(snac *snac, const xs_val *object) /* creates an 'Undo' message */ { xs_dict *msg = msg_base(snac, "Undo", "@object", snac->actor, "@now", object); const char *to; if (xs_type(object) == XSTYPE_DICT && (to = xs_dict_get(object, "object"))) msg = xs_dict_append(msg, "to", to); return msg; } xs_dict *msg_delete(snac *snac, const char *id) /* creates a 'Delete' + 'Tombstone' for a local entry */ { xs *tomb = xs_dict_new(); xs_dict *msg = NULL; /* sculpt the tombstone */ tomb = xs_dict_append(tomb, "type", "Tombstone"); tomb = xs_dict_append(tomb, "id", id); /* now create the Delete */ msg = msg_base(snac, "Delete", "@object", snac->actor, "@now", tomb); msg = xs_dict_append(msg, "to", public_address); return msg; } xs_dict *msg_follow(snac *snac, const char *q) /* creates a 'Follow' message */ { xs *actor_o = NULL; xs *actor = NULL; xs_dict *msg = NULL; int status; xs *url_or_uid = xs_strip_i(xs_str_new(q)); if (xs_startswith(url_or_uid, "https:/") || xs_startswith(url_or_uid, "http:/")) actor = xs_dup(url_or_uid); else if (!valid_status(webfinger_request(url_or_uid, &actor, NULL)) || actor == NULL) { snac_log(snac, xs_fmt("cannot resolve user %s to follow", url_or_uid)); return NULL; } /* request the actor */ status = actor_request(snac, actor, &actor_o); if (valid_status(status)) { /* check if the actor is an alias */ const char *r_actor = xs_dict_get(actor_o, "id"); if (r_actor && strcmp(actor, r_actor) != 0) { snac_log(snac, xs_fmt("actor to follow is an alias %s -> %s", actor, r_actor)); } msg = msg_base(snac, "Follow", "@dummy", snac->actor, NULL, r_actor); } else snac_log(snac, xs_fmt("cannot get actor to follow %s %d", actor, status)); return msg; } xs_dict *msg_note(snac *snac, const xs_str *content, const xs_val *rcpts, const xs_str *in_reply_to, const xs_list *attach, int priv) /* creates a 'Note' message */ { xs *ntid = tid(0); xs *id = xs_fmt("%s/p/%s", snac->actor, ntid); xs *ctxt = NULL; xs *fc2 = NULL; xs *fc1 = NULL; xs *to = NULL; xs *cc = xs_list_new(); xs *irt = NULL; xs *tag = xs_list_new(); xs *atls = xs_list_new(); xs_dict *msg = msg_base(snac, "Note", id, NULL, "@now", NULL); xs_list *p; const xs_val *v; if (rcpts == NULL) to = xs_list_new(); else { if (xs_type(rcpts) == XSTYPE_STRING) { to = xs_list_new(); to = xs_list_append(to, rcpts); } else to = xs_dup(rcpts); } /* format the content */ fc2 = not_really_markdown(content, &atls, &tag); if (in_reply_to != NULL && *in_reply_to) { xs *p_msg = NULL; xs *wrk = NULL; /* demand this thing */ timeline_request(snac, &in_reply_to, &wrk, 0); if (valid_status(object_get(in_reply_to, &p_msg))) { /* add this author as recipient */ const char *a, *v; if ((a = get_atto(p_msg)) && xs_list_in(to, a) == -1) to = xs_list_append(to, a); /* add this author to the tag list as a mention */ if (!xs_is_null(a)) { xs *l = xs_split(a, "/"); xs *actor_o = NULL; if (xs_list_len(l) > 3 && valid_status(object_get(a, &actor_o))) { const char *uname = xs_dict_get(actor_o, "preferredUsername"); if (!xs_is_null(uname) && *uname) { xs *handle = xs_fmt("@%s@%s", uname, xs_list_get(l, 2)); xs *t = xs_dict_new(); t = xs_dict_append(t, "type", "Mention"); t = xs_dict_append(t, "href", a); t = xs_dict_append(t, "name", handle); tag = xs_list_append(tag, t); } } } /* get the context, if there is one */ if ((v = xs_dict_get(p_msg, "context"))) ctxt = xs_dup(v); /* propagate the conversation field, if there is one */ if ((v = xs_dict_get(p_msg, "conversation"))) msg = xs_dict_append(msg, "conversation", v); /* if this message is public, ours will also be */ if (!priv && is_msg_public(p_msg) && xs_list_in(to, public_address) == -1) to = xs_list_append(to, public_address); } irt = xs_dup(in_reply_to); } else irt = xs_val_new(XSTYPE_NULL); /* extract the mentions and hashtags and convert the content */ fc1 = process_tags(snac, fc2, &tag); /* create the attachment list, if there are any */ if (!xs_is_null(attach)) { int c = 0; while (xs_list_next(attach, &v, &c)) { xs *d = xs_dict_new(); const char *url = xs_list_get(v, 0); const char *alt = xs_list_get(v, 1); const char *mime = xs_mime_by_ext(url); d = xs_dict_append(d, "mediaType", mime); d = xs_dict_append(d, "url", url); d = xs_dict_append(d, "name", alt); d = xs_dict_append(d, "type", xs_startswith(mime, "image/") ? "Image" : "Document"); atls = xs_list_append(atls, d); } } if (ctxt == NULL) ctxt = xs_fmt("%s#ctxt", id); /* add all mentions to the cc */ p = tag; while (xs_list_iter(&p, &v)) { if (xs_type(v) == XSTYPE_DICT) { const char *t; if (!xs_is_null(t = xs_dict_get(v, "type")) && strcmp(t, "Mention") == 0) { if (!xs_is_null(t = xs_dict_get(v, "href"))) cc = xs_list_append(cc, t); } } } /* no recipients? must be for everybody */ if (!priv && xs_list_len(to) == 0) to = xs_list_append(to, public_address); /* delete all cc recipients that also are in the to */ p = to; while (xs_list_iter(&p, &v)) { int i; if ((i = xs_list_in(cc, v)) != -1) cc = xs_list_del(cc, i); } msg = xs_dict_append(msg, "attributedTo", snac->actor); msg = xs_dict_append(msg, "summary", ""); msg = xs_dict_append(msg, "content", fc1); msg = xs_dict_append(msg, "context", ctxt); msg = xs_dict_append(msg, "url", id); msg = xs_dict_append(msg, "to", to); msg = xs_dict_append(msg, "cc", cc); msg = xs_dict_append(msg, "inReplyTo", irt); msg = xs_dict_append(msg, "tag", tag); msg = xs_dict_append(msg, "sourceContent", content); if (xs_list_len(atls)) msg = xs_dict_append(msg, "attachment", atls); return msg; } xs_dict *msg_ping(snac *user, const char *rcpt) /* creates a Ping message (https://humungus.tedunangst.com/r/honk/v/tip/f/docs/ping.txt) */ { xs_dict *msg = msg_base(user, "Ping", "@dummy", user->actor, NULL, NULL); msg = xs_dict_append(msg, "to", rcpt); return msg; } xs_dict *msg_pong(snac *user, const char *rcpt, const char *object) /* creates a Pong message (https://humungus.tedunangst.com/r/honk/v/tip/f/docs/ping.txt) */ { xs_dict *msg = msg_base(user, "Pong", "@dummy", user->actor, NULL, object); msg = xs_dict_append(msg, "to", rcpt); return msg; } xs_dict *msg_question(snac *user, const char *content, xs_list *attach, const xs_list *opts, int multiple, int end_secs) /* creates a Question message */ { xs_dict *msg = msg_note(user, content, NULL, NULL, attach, 0); int max = 8; xs_set seen; msg = xs_dict_set(msg, "type", "Question"); /* make it non-editable */ msg = xs_dict_del(msg, "sourceContent"); xs *o = xs_list_new(); xs_list *p = (xs_list *)opts; const xs_str *v; xs *replies = xs_json_loads("{\"type\":\"Collection\",\"totalItems\":0}"); xs_set_init(&seen); while (max && xs_list_iter(&p, &v)) { if (*v) { xs *v2 = xs_dup(v); xs *d = xs_dict_new(); if (strlen(v2) > 60) { v2[60] = '\0'; v2 = xs_str_cat(v2, "..."); } if (xs_set_add(&seen, v2) == 1) { d = xs_dict_append(d, "type", "Note"); d = xs_dict_append(d, "name", v2); d = xs_dict_append(d, "replies", replies); o = xs_list_append(o, d); max--; } } } xs_set_free(&seen); msg = xs_dict_append(msg, multiple ? "anyOf" : "oneOf", o); /* set the end time */ time_t t = time(NULL) + end_secs; xs *et = xs_str_utctime(t, ISO_DATE_SPEC); msg = xs_dict_append(msg, "endTime", et); return msg; } int update_question(snac *user, const char *id) /* updates the poll counts */ { xs *msg = NULL; xs *rcnt = xs_dict_new(); xs *lopts = xs_list_new(); const xs_list *opts; xs_list *p; const xs_val *v; /* get the object */ if (!valid_status(object_get(id, &msg))) return -1; /* closed? do nothing more */ if (xs_dict_get(msg, "closed")) return -2; /* get the options */ if ((opts = xs_dict_get(msg, "oneOf")) == NULL && (opts = xs_dict_get(msg, "anyOf")) == NULL) return -3; /* fill the initial count */ int c = 0; while (xs_list_next(opts, &v, &c)) { const char *name = xs_dict_get(v, "name"); if (name) { lopts = xs_list_append(lopts, name); rcnt = xs_dict_set(rcnt, name, xs_stock(0)); } } xs_set s; xs_set_init(&s); /* iterate now the children (the votes) */ xs *chld = object_children(id); p = chld; while (xs_list_iter(&p, &v)) { xs *obj = NULL; if (!valid_status(object_get_by_md5(v, &obj))) continue; const char *name = xs_dict_get(obj, "name"); const char *atto = get_atto(obj); if (name && atto) { /* get the current count */ const xs_number *cnt = xs_dict_get(rcnt, name); if (xs_type(cnt) == XSTYPE_NUMBER) { /* if it exists, increment */ xs *ucnt = xs_number_new(xs_number_get(cnt) + 1); rcnt = xs_dict_set(rcnt, name, ucnt); xs_set_add(&s, atto); } } } xs *rcpts = xs_set_result(&s); /* create a new list of options with their new counts */ xs *nopts = xs_list_new(); p = lopts; while (xs_list_iter(&p, &v)) { const xs_number *cnt = xs_dict_get(rcnt, v); if (xs_type(cnt) == XSTYPE_NUMBER) { xs *d1 = xs_dict_new(); xs *d2 = xs_dict_new(); d2 = xs_dict_append(d2, "type", "Collection"); d2 = xs_dict_append(d2, "totalItems", cnt); d1 = xs_dict_append(d1, "type", "Note"); d1 = xs_dict_append(d1, "name", v); d1 = xs_dict_append(d1, "replies", d2); nopts = xs_list_append(nopts, d1); } } /* update the list */ msg = xs_dict_set(msg, xs_dict_get(msg, "oneOf") != NULL ? "oneOf" : "anyOf", nopts); /* due date? */ int closed = 0; const char *end_time = xs_dict_get(msg, "endTime"); if (!xs_is_null(end_time)) { xs *now = xs_str_utctime(0, ISO_DATE_SPEC); /* is now greater than the endTime? */ if (strcmp(now, end_time) >= 0) { xs *et = xs_dup(end_time); msg = xs_dict_set(msg, "closed", et); closed = 1; } } /* update the count of voters */ xs *vcnt = xs_number_new(xs_list_len(rcpts)); msg = xs_dict_set(msg, "votersCount", vcnt); msg = xs_dict_set(msg, "cc", rcpts); /* store */ object_add_ow(id, msg); snac_debug(user, 1, xs_fmt("recounted poll %s", id)); timeline_touch(user); /* send an update message to all voters */ xs *u_msg = msg_update(user, msg); u_msg = xs_dict_set(u_msg, "cc", rcpts); enqueue_message(user, u_msg); if (closed) { xs *c_msg = msg_update(user, msg); notify(user, "Update", "Question", user->actor, c_msg); } return 0; } /** queues **/ int process_input_message(snac *snac, const xs_dict *msg, const xs_dict *req) /* processes an ActivityPub message from the input queue */ /* return values: -1, fatal error; 0, transient error, retry; 1, processed and done; 2, propagate to users (only when no user is set) */ { const char *actor = xs_dict_get(msg, "actor"); const char *type = xs_dict_get(msg, "type"); xs *actor_o = NULL; int a_status; int do_notify = 0; if (xs_is_null(actor) || *actor == '\0') { srv_debug(0, xs_fmt("malformed message (bad actor)")); return -1; } /* question votes may not have a type */ if (xs_is_null(type)) type = "Note"; /* reject uninteresting messages right now */ if (xs_match(type, "Add|View")) { srv_debug(0, xs_fmt("Ignored message of type '%s'", type)); return -1; } const char *object, *utype; object = xs_dict_get(msg, "object"); if (object != NULL && xs_type(object) == XSTYPE_DICT) utype = xs_dict_get(object, "type"); else utype = "(null)"; /* special case for Delete messages */ if (strcmp(type, "Delete") == 0) { /* if the actor is not here, do not even try */ if (!object_here(actor)) { srv_debug(1, xs_fmt("dropped 'Delete' message from unknown actor '%s'", actor)); return -1; } /* discard crap */ if (xs_is_null(object)) { srv_log(xs_fmt("dropped 'Delete' message with invalid object from actor '%s'", actor)); return -1; } /* also discard if the object to be deleted is not here */ const char *obj_id = object; if (xs_type(obj_id) == XSTYPE_DICT) obj_id = xs_dict_get(obj_id, "id"); if (!object_here(obj_id)) { srv_debug(1, xs_fmt("dropped 'Delete' message from unknown object '%s'", obj_id)); return -1; } } /* bring the actor */ a_status = actor_request(snac, actor, &actor_o); /* do not retry permanent failures */ if (a_status == HTTP_STATUS_NOT_FOUND || a_status == HTTP_STATUS_GONE || a_status < 0) { srv_debug(1, xs_fmt("dropping message due to actor error %s %d", actor, a_status)); return -1; } if (!valid_status(a_status)) { /* do not retry 'Delete' messages */ if (strcmp(type, "Delete") == 0) { srv_debug(1, xs_fmt("dropping 'Delete' message due to actor error %s %d", actor, a_status)); return -1; } /* other actor download errors */ /* the actor may require a signed request; propagate if no user is set */ if (snac == NULL) return 2; /* may need a retry */ srv_debug(0, xs_fmt("error requesting actor %s %d -- retry later", actor, a_status)); return 0; } /* check the signature */ xs *sig_err = NULL; if (!check_signature(req, &sig_err)) { srv_log(xs_fmt("bad signature %s (%s)", actor, sig_err)); srv_archive_error("check_signature", sig_err, req, msg); return -1; } /* if no user is set, no further checks can be done; propagate */ if (snac == NULL) return 2; /* reject messages that are not for this user */ if (!is_msg_for_me(snac, msg)) { snac_debug(snac, 1, xs_fmt("message from %s of type '%s' not for us", actor, type)); return 1; } /* if it's a DM from someone we don't follow, reject the message */ if (xs_type(xs_dict_get(snac->config, "drop_dm_from_unknown")) == XSTYPE_TRUE) { if (strcmp(utype, "Note") == 0 && !is_msg_public(msg) && !following_check(snac, actor)) { snac_log(snac, xs_fmt("DM rejected from unknown actor %s", actor)); return 1; } } /* check the minimum acceptable account age */ int min_account_age = xs_number_get(xs_dict_get(srv_config, "min_account_age")); if (min_account_age > 0) { const char *actor_date = xs_dict_get(actor_o, "published"); if (!xs_is_null(actor_date)) { time_t actor_t = xs_parse_iso_date(actor_date, 0); if (actor_t < 950000000) { snac_log(snac, xs_fmt("rejected activity from %s (suspicious date, %s)", actor, actor_date)); return 1; } if (actor_t > 0) { int td = (int)(time(NULL) - actor_t); snac_debug(snac, 2, xs_fmt("actor %s age: %d seconds", actor, td)); if (td < min_account_age) { snac_log(snac, xs_fmt("rejected activity from %s (too new, %d seconds)", actor, td)); return 1; } } } else snac_debug(snac, 1, xs_fmt("warning: empty or null creation date for %s", actor)); } if (strcmp(type, "Follow") == 0) { /** **/ if (!follower_check(snac, actor)) { /* ensure the actor object is here */ if (!object_here(actor)) { xs *actor_obj = NULL; actor_request(snac, actor, &actor_obj); object_add(actor, actor_obj); } xs *f_msg = xs_dup(msg); xs *reply = msg_accept(snac, f_msg, actor); post_message(snac, actor, reply); if (xs_is_null(xs_dict_get(f_msg, "published"))) { /* add a date if it doesn't include one (Mastodon) */ xs *date = xs_str_utctime(0, ISO_DATE_SPEC); f_msg = xs_dict_set(f_msg, "published", date); } timeline_add(snac, xs_dict_get(f_msg, "id"), f_msg); follower_add(snac, actor); snac_log(snac, xs_fmt("new follower %s", actor)); do_notify = 1; } else snac_log(snac, xs_fmt("repeated 'Follow' from %s", actor)); } else if (strcmp(type, "Undo") == 0) { /** **/ const char *id = xs_dict_get(object, "object"); if (xs_type(object) != XSTYPE_DICT) utype = "Follow"; if (strcmp(utype, "Follow") == 0) { /** **/ if (id && strcmp(id, snac->actor) != 0) snac_debug(snac, 1, xs_fmt("Undo + Follow from %s not for us (%s)", actor, id)); else { if (valid_status(follower_del(snac, actor))) { snac_log(snac, xs_fmt("no longer following us %s", actor)); do_notify = 1; } else snac_log(snac, xs_fmt("error deleting follower %s", actor)); } } else if (strcmp(utype, "Like") == 0) { /** **/ int status = object_unadmire(id, actor, 1); snac_log(snac, xs_fmt("Unlike for %s %d", id, status)); } else if (strcmp(utype, "Announce") == 0) { /** **/ int status = HTTP_STATUS_OK; /* commented out: if a followed user boosts something that is requested and then unboosts, the post remains here, but with no apparent reason, and that is confusing */ //status = object_unadmire(id, actor, 0); snac_log(snac, xs_fmt("Unboost for %s %d", id, status)); } else snac_debug(snac, 1, xs_fmt("ignored 'Undo' for object type '%s'", utype)); } else if (strcmp(type, "Create") == 0) { /** **/ if (is_muted(snac, actor)) { snac_log(snac, xs_fmt("ignored 'Create' + '%s' from muted actor %s", utype, actor)); return 1; } if (xs_match(utype, "Note|Article")) { /** **/ const char *id = xs_dict_get(object, "id"); const char *in_reply_to = xs_dict_get(object, "inReplyTo"); const char *atto = get_atto(object); xs *wrk = NULL; if (xs_is_null(id)) snac_log(snac, xs_fmt("malformed message: no 'id' field")); else if (xs_is_null(atto)) snac_log(snac, xs_fmt("malformed message: no 'attributedTo' field")); else if (!xs_is_null(in_reply_to) && is_hidden(snac, in_reply_to)) { snac_debug(snac, 0, xs_fmt("dropped reply %s to hidden post %s", id, in_reply_to)); } else { if (content_match("filter_reject.txt", object)) { snac_log(snac, xs_fmt("rejected by content %s", id)); return 1; } if (strcmp(actor, atto) != 0) snac_log(snac, xs_fmt("SUSPICIOUS: actor != atto (%s != %s)", actor, atto)); timeline_request(snac, &in_reply_to, &wrk, 0); if (timeline_add(snac, id, object)) { snac_log(snac, xs_fmt("new '%s' %s %s", utype, actor, id)); do_notify = 1; } /* if it has a "name" field, it may be a vote for a question */ const char *name = xs_dict_get(object, "name"); if (!xs_is_null(name) && *name && !xs_is_null(in_reply_to) && *in_reply_to) update_question(snac, in_reply_to); } } else if (strcmp(utype, "Question") == 0) { /** **/ const char *id = xs_dict_get(object, "id"); if (timeline_add(snac, id, object)) snac_log(snac, xs_fmt("new 'Question' %s %s", actor, id)); } else if (strcmp(utype, "Video") == 0) { /** **/ const char *id = xs_dict_get(object, "id"); if (timeline_add(snac, id, object)) snac_log(snac, xs_fmt("new 'Video' %s %s", actor, id)); } else snac_debug(snac, 1, xs_fmt("ignored 'Create' for object type '%s'", utype)); } else if (strcmp(type, "Accept") == 0) { /** **/ if (strcmp(utype, "(null)") == 0) { const char *obj_id = xs_dict_get(msg, "object"); /* if the accepted object id is a string that may be created by us, it's a follow */ if (xs_type(obj_id) == XSTYPE_STRING && xs_startswith(obj_id, srv_baseurl) && xs_endswith(obj_id, "/Follow")) utype = "Follow"; } if (strcmp(utype, "Follow") == 0) { /** **/ if (following_check(snac, actor)) { following_add(snac, actor, msg); snac_log(snac, xs_fmt("confirmed follow from %s", actor)); } else snac_log(snac, xs_fmt("spurious follow accept from %s", actor)); } else if (strcmp(utype, "Create") == 0) { /* some implementations send Create confirmations, go figure */ snac_debug(snac, 1, xs_dup("ignored 'Accept' + 'Create'")); } else { srv_archive_error("accept", "ignored Accept", req, msg); snac_debug(snac, 1, xs_fmt("ignored 'Accept' for object type '%s'", utype)); } } else if (strcmp(type, "Like") == 0 || strcmp(type, "EmojiReact") == 0) { /** **/ if (xs_type(object) == XSTYPE_DICT) object = xs_dict_get(object, "id"); if (timeline_admire(snac, object, actor, 1) == HTTP_STATUS_CREATED) snac_log(snac, xs_fmt("new '%s' %s %s", type, actor, object)); else snac_log(snac, xs_fmt("repeated 'Like' from %s to %s", actor, object)); do_notify = 1; } else if (strcmp(type, "Announce") == 0) { /** **/ if (xs_type(object) == XSTYPE_DICT) object = xs_dict_get(object, "id"); if (is_muted(snac, actor) && !xs_startswith(object, snac->actor)) snac_log(snac, xs_fmt("dropped 'Announce' from muted actor %s", actor)); else if (is_limited(snac, actor) && !xs_startswith(object, snac->actor)) snac_log(snac, xs_fmt("dropped 'Announce' from limited actor %s", actor)); else { xs *a_msg = NULL; xs *wrk = NULL; timeline_request(snac, &object, &wrk, 0); if (valid_status(object_get(object, &a_msg))) { const char *who = get_atto(a_msg); if (who && !is_muted(snac, who)) { /* bring the actor */ xs *who_o = NULL; if (valid_status(actor_request(snac, who, &who_o))) { if (timeline_admire(snac, object, actor, 0) == HTTP_STATUS_CREATED) snac_log(snac, xs_fmt("new 'Announce' %s %s", actor, object)); else snac_log(snac, xs_fmt("repeated 'Announce' from %s to %s", actor, object)); /* distribute the post with the actor as 'proxy' */ list_distribute(snac, actor, a_msg); do_notify = 1; } else snac_debug(snac, 1, xs_fmt("dropped 'Announce' on actor request error %s", who)); } else snac_log(snac, xs_fmt("ignored 'Announce' about muted actor %s", who)); } else snac_debug(snac, 2, xs_fmt("error requesting 'Announce' object %s", object)); } } else if (strcmp(type, "Update") == 0) { /** **/ if (xs_match(utype, "Person|Service")) { /** **/ actor_add(actor, xs_dict_get(msg, "object")); timeline_touch(snac); snac_log(snac, xs_fmt("updated actor %s", actor)); } else if (xs_match(utype, "Note|Page|Article|Video")) { /** **/ const char *id = xs_dict_get(object, "id"); if (object_here(id)) { object_add_ow(id, object); timeline_touch(snac); snac_log(snac, xs_fmt("updated '%s' %s", utype, id)); } else snac_log(snac, xs_fmt("dropped update for unknown '%s' %s", utype, id)); } else if (strcmp(utype, "Question") == 0) { /** **/ const char *id = xs_dict_get(object, "id"); const char *closed = xs_dict_get(object, "closed"); object_add_ow(id, object); timeline_touch(snac); snac_log(snac, xs_fmt("%s poll %s", closed == NULL ? "updated" : "closed", id)); if (closed != NULL) do_notify = 1; } else { srv_archive_error("unsupported_update", "unsupported_update", req, msg); snac_log(snac, xs_fmt("ignored 'Update' for object type '%s'", utype)); } } else if (strcmp(type, "Delete") == 0) { /** **/ if (xs_type(object) == XSTYPE_DICT) object = xs_dict_get(object, "id"); if (object_here(object)) { timeline_del(snac, object); snac_debug(snac, 1, xs_fmt("new 'Delete' %s %s", actor, object)); } else snac_debug(snac, 1, xs_fmt("ignored 'Delete' for unknown object %s", object)); } else if (strcmp(type, "Pong") == 0) { /** **/ snac_log(snac, xs_fmt("'Pong' received from %s", actor)); } else if (strcmp(type, "Ping") == 0) { /** **/ snac_log(snac, xs_fmt("'Ping' requested from %s", actor)); xs *rsp = msg_pong(snac, actor, xs_dict_get(msg, "id")); enqueue_output_by_actor(snac, rsp, actor, 0); } else if (strcmp(type, "Block") == 0) { /** **/ snac_log(snac, xs_fmt("'Block' received from %s", actor)); /* should we MUTE the actor back? */ /* mute(snac, actor); */ do_notify = 1; } else if (strcmp(type, "Move") == 0) { /** **/ do_notify = 1; const char *old_account = xs_dict_get(msg, "object"); const char *new_account = xs_dict_get(msg, "target"); if (!xs_is_null(old_account) && !xs_is_null(new_account)) { if (following_check(snac, old_account)) { xs *n_actor = NULL; if (valid_status(object_get(new_account, &n_actor))) { const xs_list *aka = xs_dict_get(n_actor, "alsoKnownAs"); if (xs_type(aka) == XSTYPE_LIST) { if (xs_list_in(aka, old_account) != -1) { /* all conditions met! */ /* follow new account */ xs *f_msg = msg_follow(snac, new_account); if (f_msg != NULL) { const char *new_actor = xs_dict_get(f_msg, "object"); following_add(snac, new_actor, f_msg); enqueue_output_by_actor(snac, f_msg, new_actor, 0); snac_log(snac, xs_fmt("'Move': following %s", new_account)); } /* unfollow old account */ xs *of_msg = NULL; if (valid_status(following_get(snac, old_account, &of_msg))) { xs *uf_msg = msg_undo(snac, xs_dict_get(of_msg, "object")); following_del(snac, old_account); enqueue_output_by_actor(snac, uf_msg, old_account, 0); snac_log(snac, xs_fmt("'Move': unfollowing %s", old_account)); } } else snac_log(snac, xs_fmt("'Move' error: old actor %s not found in %s 'alsoKnownAs'", old_account, new_account)); } else snac_log(snac, xs_fmt("'Move' error: cannot get %s 'alsoKnownAs'", new_account)); } else snac_log(snac, xs_fmt("'Move' error: cannot get new actor %s", new_account)); } else snac_log(snac, xs_fmt("'Move' error: actor %s is not being followed", old_account)); } else { snac_log(snac, xs_fmt("'Move' error: malformed message from %s", actor)); srv_archive_error("move", "move", req, msg); } } else { srv_archive_error("unsupported_type", "unsupported_type", req, msg); snac_debug(snac, 1, xs_fmt("process_input_message type '%s' ignored", type)); } if (do_notify) { notify(snac, type, utype, actor, msg); timeline_touch(snac); } return 1; } int send_email(const char *msg) /* invoke sendmail with email headers and body in msg */ { FILE *f; int status; int fds[2]; pid_t pid; if (pipe(fds) == -1) return -1; pid = vfork(); if (pid == -1) return -1; else if (pid == 0) { dup2(fds[0], 0); close(fds[0]); close(fds[1]); execl("/usr/sbin/sendmail", "sendmail", "-t", (char *) NULL); _exit(1); } close(fds[0]); if ((f = fdopen(fds[1], "w")) == NULL) { close(fds[1]); return -1; } fprintf(f, "%s\n", msg); fclose(f); if (waitpid(pid, &status, 0) == -1) return -1; return status; } void process_user_queue_item(snac *snac, xs_dict *q_item) /* processes an item from the user queue */ { const char *type; int queue_retry_max = xs_number_get(xs_dict_get(srv_config, "queue_retry_max")); if ((type = xs_dict_get(q_item, "type")) == NULL) type = "output"; if (strcmp(type, "message") == 0) { const xs_dict *msg = xs_dict_get(q_item, "message"); xs *rcpts = recipient_list(snac, msg, 1); xs_set inboxes; const xs_str *actor; int c; xs_set_init(&inboxes); /* iterate the recipients */ c = 0; while (xs_list_next(rcpts, &actor, &c)) { xs *inbox = get_actor_inbox(actor); if (inbox != NULL) { /* add to the set and, if it's not there, send message */ if (xs_set_add(&inboxes, inbox) == 1) enqueue_output(snac, msg, inbox, 0, 0); } else snac_log(snac, xs_fmt("cannot find inbox for %s", actor)); } /* if it's a public note or question, send to the collected inboxes */ if (xs_match(xs_dict_get_def(msg, "type", ""), "Create|Update") && is_msg_public(msg)) { if (xs_type(xs_dict_get(srv_config, "disable_inbox_collection")) != XSTYPE_TRUE) { xs *shibx = inbox_list(); const xs_str *inbox; c = 0; while (xs_list_next(shibx, &inbox, &c)) { if (xs_set_add(&inboxes, inbox) == 1) enqueue_output(snac, msg, inbox, 0, 0); } } } xs_set_free(&inboxes); } else if (strcmp(type, "input") == 0) { /* process the message */ const xs_dict *msg = xs_dict_get(q_item, "message"); const xs_dict *req = xs_dict_get(q_item, "req"); int retries = xs_number_get(xs_dict_get(q_item, "retries")); if (xs_is_null(msg)) return; if (!process_input_message(snac, msg, req)) { srv_archive_error("input", "process_input_message", req, msg); if (retries > queue_retry_max) snac_log(snac, xs_fmt("input giving up")); else { /* reenqueue */ enqueue_input(snac, msg, req, retries + 1); snac_log(snac, xs_fmt("input requeue #%d", retries + 1)); } } } else if (strcmp(type, "close_question") == 0) { /* the time for this question has ended */ const char *id = xs_dict_get(q_item, "message"); if (!xs_is_null(id)) update_question(snac, id); } else if (strcmp(type, "object_request") == 0) { const char *id = xs_dict_get(q_item, "message"); if (!xs_is_null(id)) { int status; xs *data = NULL; status = activitypub_request(snac, id, &data); if (valid_status(status)) object_add_ow(id, data); snac_debug(snac, 1, xs_fmt("object_request %s %d", id, status)); } } else if (strcmp(type, "verify_links") == 0) { verify_links(snac); } else if (strcmp(type, "actor_refresh") == 0) { const char *actor = xs_dict_get(q_item, "actor"); double mtime = object_mtime(actor); /* only refresh if it was refreshed more than an hour ago */ if (mtime + 3600.0 < (double) time(NULL)) { xs *actor_o = NULL; int status; if (valid_status((status = activitypub_request(snac, actor, &actor_o)))) actor_add(actor, actor_o); else object_touch(actor); snac_log(snac, xs_fmt("actor_refresh %s %d", actor, status)); } } else snac_log(snac, xs_fmt("unexpected user q_item type '%s'", type)); } int process_user_queue(snac *snac) /* processes a user's queue */ { int cnt = 0; xs *list = user_queue(snac); xs_list *p = list; const xs_str *fn; while (xs_list_iter(&p, &fn)) { xs *q_item = dequeue(fn); if (q_item == NULL) continue; process_user_queue_item(snac, q_item); cnt++; } return cnt; } void process_queue_item(xs_dict *q_item) /* processes an item from the global queue */ { const char *type = xs_dict_get(q_item, "type"); int queue_retry_max = xs_number_get(xs_dict_get(srv_config, "queue_retry_max")); if (strcmp(type, "output") == 0) { int status; const xs_str *inbox = xs_dict_get(q_item, "inbox"); const xs_str *keyid = xs_dict_get(q_item, "keyid"); const xs_str *seckey = xs_dict_get(q_item, "seckey"); const xs_dict *msg = xs_dict_get(q_item, "message"); int retries = xs_number_get(xs_dict_get(q_item, "retries")); int p_status = xs_number_get(xs_dict_get(q_item, "p_status")); xs *payload = NULL; int p_size = 0; int timeout = 0; if (xs_is_null(inbox) || xs_is_null(msg) || xs_is_null(keyid) || xs_is_null(seckey)) { srv_log(xs_fmt("output message error: missing fields")); return; } if (is_instance_blocked(inbox)) { srv_debug(0, xs_fmt("discarded output message to blocked instance %s", inbox)); return; } /* deliver (if previous error status was a timeout, try now longer) */ if (p_status == 599) timeout = xs_number_get(xs_dict_get_def(srv_config, "queue_timeout_2", "8")); else timeout = xs_number_get(xs_dict_get_def(srv_config, "queue_timeout", "6")); if (timeout == 0) timeout = 6; status = send_to_inbox_raw(keyid, seckey, inbox, msg, &payload, &p_size, timeout); if (payload) { if (p_size > 64) { /* trim the message */ payload[64] = '\0'; payload = xs_str_cat(payload, "..."); } /* strip ugly control characters */ payload = xs_replace_i(payload, "\n", ""); payload = xs_replace_i(payload, "\r", ""); if (*payload) payload = xs_str_wrap_i(" [", payload, "]"); } else payload = xs_str_new(NULL); srv_log(xs_fmt("output message: sent to inbox %s %d%s", inbox, status, payload)); if (!valid_status(status)) { retries++; /* if it's not the first time it fails with a timeout, penalize the server by skipping one retry */ if (p_status == status && status == HTTP_STATUS_CLIENT_CLOSED_REQUEST) retries++; /* error sending; requeue? */ if (status == HTTP_STATUS_BAD_REQUEST || status == HTTP_STATUS_NOT_FOUND || status == HTTP_STATUS_METHOD_NOT_ALLOWED || status == HTTP_STATUS_GONE || status == HTTP_STATUS_UNPROCESSABLE_CONTENT || status < 0) /* explicit error: discard */ srv_log(xs_fmt("output message: fatal error %s %d", inbox, status)); else if (retries > queue_retry_max) srv_log(xs_fmt("output message: giving up %s %d", inbox, status)); else { /* requeue */ enqueue_output_raw(keyid, seckey, msg, inbox, retries, status); srv_log(xs_fmt("output message: requeue %s #%d", inbox, retries)); } } } else if (strcmp(type, "email") == 0) { /* send this email */ const xs_str *msg = xs_dict_get(q_item, "message"); int retries = xs_number_get(xs_dict_get(q_item, "retries")); if (!send_email(msg)) srv_debug(1, xs_fmt("email message sent")); else { retries++; if (retries > queue_retry_max) srv_log(xs_fmt("email giving up (errno: %d)", errno)); else { /* requeue */ srv_log(xs_fmt( "email requeue #%d (errno: %d)", retries, errno)); enqueue_email(msg, retries); } } } else if (strcmp(type, "telegram") == 0) { /* send this via telegram */ const char *bot = xs_dict_get(q_item, "bot"); const char *msg = xs_dict_get(q_item, "message"); xs *chat_id = xs_dup(xs_dict_get(q_item, "chat_id")); int status = 0; /* chat_id must start with a - */ if (!xs_startswith(chat_id, "-")) chat_id = xs_str_wrap_i("-", chat_id, NULL); xs *url = xs_fmt("https:/" "/api.telegram.org/bot%s/sendMessage", bot); xs *body = xs_fmt("{\"chat_id\":%s,\"text\":\"%s\"}", chat_id, msg); xs *headers = xs_dict_new(); headers = xs_dict_append(headers, "content-type", "application/json"); xs *rsp = xs_http_request("POST", url, headers, body, strlen(body), &status, NULL, NULL, 0); rsp = xs_free(rsp); srv_debug(0, xs_fmt("telegram post %d", status)); } else if (strcmp(type, "ntfy") == 0) { /* send this via ntfy */ const char *ntfy_server = xs_dict_get(q_item, "ntfy_server"); const char *msg = xs_dict_get(q_item, "message"); const char *ntfy_token = xs_dict_get(q_item, "ntfy_token"); int status = 0; xs *url = xs_fmt("%s", ntfy_server); xs *body = xs_fmt("%s", msg); xs *headers = xs_dict_new(); headers = xs_dict_append(headers, "content-type", "text/plain"); // Append the Authorization header only if ntfy_token is not NULL if (ntfy_token != NULL) { headers = xs_dict_append(headers, "Authorization", xs_fmt("Bearer %s", ntfy_token)); } xs *rsp = xs_http_request("POST", url, headers, body, strlen(body), &status, NULL, NULL, 0); rsp = xs_free(rsp); srv_debug(0, xs_fmt("ntfy post %d", status)); } else if (strcmp(type, "purge") == 0) { srv_log(xs_dup("purge start")); purge_all(); srv_log(xs_dup("purge end")); } else if (strcmp(type, "input") == 0) { const xs_dict *msg = xs_dict_get(q_item, "message"); const xs_dict *req = xs_dict_get(q_item, "req"); int retries = xs_number_get(xs_dict_get(q_item, "retries")); /* do some instance-level checks */ int r = process_input_message(NULL, msg, req); if (r == 0) { /* transient error? retry */ if (retries > queue_retry_max) srv_log(xs_fmt("shared input giving up")); else { /* reenqueue */ enqueue_shared_input(msg, req, retries + 1); srv_log(xs_fmt("shared input requeue #%d", retries + 1)); } } else if (r == 2) { /* redistribute the input message to all users */ const char *ntid = xs_dict_get(q_item, "ntid"); xs *tmpfn = xs_fmt("%s/tmp/%s.json", srv_basedir, ntid); FILE *f; if ((f = fopen(tmpfn, "w")) != NULL) { xs_json_dump(q_item, 4, f); fclose(f); } xs *users = user_list(); xs_list *p = users; const char *v; int cnt = 0; while (xs_list_iter(&p, &v)) { snac user; if (user_open(&user, v)) { if (is_msg_for_me(&user, msg)) { xs *fn = xs_fmt("%s/queue/%s.json", user.basedir, ntid); snac_debug(&user, 1, xs_fmt("enqueue_input (from shared inbox) %s", xs_dict_get(msg, "id"))); if (link(tmpfn, fn) < 0) srv_log(xs_fmt("link(%s, %s) error", tmpfn, fn)); cnt++; } user_free(&user); } } unlink(tmpfn); if (cnt == 0) { srv_archive_qitem("no_valid_recipients", q_item); srv_debug(1, xs_fmt("no valid recipients for %s", xs_dict_get(msg, "id"))); } } } else srv_log(xs_fmt("unexpected q_item type '%s'", type)); } int process_queue(void) /* processes the global queue */ { int cnt = 0; xs *list = queue(); xs_list *p = list; const xs_str *fn; while (xs_list_iter(&p, &fn)) { xs *q_item = dequeue(fn); if (q_item != NULL) { job_post(q_item, 0); cnt++; } } return cnt; } /** HTTP handlers */ int activitypub_get_handler(const xs_dict *req, const char *q_path, char **body, int *b_size, char **ctype) { int status = HTTP_STATUS_OK; const char *accept = xs_dict_get(req, "accept"); snac snac; xs *msg = NULL; if (accept == NULL) return 0; if (xs_str_in(accept, "application/activity+json") == -1 && xs_str_in(accept, "application/ld+json") == -1) return 0; xs *l = xs_split_n(q_path, "/", 2); const char *uid; const char *p_path; uid = xs_list_get(l, 1); if (!user_open(&snac, uid)) { /* invalid user */ srv_debug(1, xs_fmt("activitypub_get_handler bad user %s", uid)); return HTTP_STATUS_NOT_FOUND; } p_path = xs_list_get(l, 2); *ctype = "application/activity+json"; if (p_path == NULL) { /* if there was no component after the user, it's an actor request */ msg = msg_actor(&snac); *ctype = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\""; const char *ua = xs_dict_get(req, "user-agent"); snac_debug(&snac, 0, xs_fmt("serving actor [%s]", ua ? ua : "No UA")); } else if (strcmp(p_path, "outbox") == 0) { xs *id = xs_fmt("%s/outbox", snac.actor); xs *elems = timeline_simple_list(&snac, "public", 0, 20); xs *list = xs_list_new(); msg = msg_collection(&snac, id); char *p; const char *v; p = elems; while (xs_list_iter(&p, &v)) { xs *i = NULL; if (valid_status(object_get_by_md5(v, &i))) { const char *type = xs_dict_get(i, "type"); const char *id = xs_dict_get(i, "id"); if (type && id && strcmp(type, "Note") == 0 && xs_startswith(id, snac.actor)) { xs *c_msg = msg_create(&snac, i); list = xs_list_append(list, c_msg); } } } /* replace the 'orderedItems' with the latest posts */ xs *items = xs_number_new(xs_list_len(list)); msg = xs_dict_set(msg, "orderedItems", list); msg = xs_dict_set(msg, "totalItems", items); } else if (strcmp(p_path, "followers") == 0 || strcmp(p_path, "following") == 0) { xs *id = xs_fmt("%s/%s", snac.actor, p_path); msg = msg_collection(&snac, id); } else if (xs_startswith(p_path, "p/")) { xs *id = xs_fmt("%s/%s", snac.actor, p_path); status = object_get(id, &msg); /* don't return non-public objects */ if (valid_status(status) && !is_msg_public(msg)) status = HTTP_STATUS_NOT_FOUND; } else status = HTTP_STATUS_NOT_FOUND; if (status == HTTP_STATUS_OK && msg != NULL) { *body = xs_json_dumps(msg, 4); *b_size = strlen(*body); } snac_debug(&snac, 1, xs_fmt("activitypub_get_handler serving %s %d", q_path, status)); user_free(&snac); return status; } int activitypub_post_handler(const xs_dict *req, const char *q_path, char *payload, int p_size, char **body, int *b_size, char **ctype) /* processes an input message */ { (void)b_size; int status = HTTP_STATUS_ACCEPTED; const char *i_ctype = xs_dict_get(req, "content-type"); snac snac; const char *v; if (i_ctype == NULL) { *body = xs_str_new("no content-type"); *ctype = "text/plain"; return HTTP_STATUS_BAD_REQUEST; } if (xs_is_null(payload)) { *body = xs_str_new("no payload"); *ctype = "text/plain"; return HTTP_STATUS_BAD_REQUEST; } if (xs_str_in(i_ctype, "application/activity+json") == -1 && xs_str_in(i_ctype, "application/ld+json") == -1) return 0; /* decode the message */ xs *msg = xs_json_loads(payload); const char *id = xs_dict_get(msg, "id"); if (msg == NULL) { srv_log(xs_fmt("activitypub_post_handler JSON error %s", q_path)); srv_archive_error("activitypub_post_handler", "JSON error", req, payload); *body = xs_str_new("JSON error"); *ctype = "text/plain"; return HTTP_STATUS_BAD_REQUEST; } if (id && is_instance_blocked(id)) { srv_debug(1, xs_fmt("full instance block for %s", id)); *body = xs_str_new("blocked"); *ctype = "text/plain"; return HTTP_STATUS_FORBIDDEN; } /* get the user and path */ xs *l = xs_split_n(q_path, "/", 2); if (xs_list_len(l) == 2 && strcmp(xs_list_get(l, 1), "shared-inbox") == 0) { enqueue_shared_input(msg, req, 0); return HTTP_STATUS_ACCEPTED; } if (xs_list_len(l) != 3 || strcmp(xs_list_get(l, 2), "inbox") != 0) { /* strange q_path */ srv_debug(1, xs_fmt("activitypub_post_handler unsupported path %s", q_path)); return HTTP_STATUS_NOT_FOUND; } const char *uid = xs_list_get(l, 1); if (!user_open(&snac, uid)) { /* invalid user */ srv_debug(1, xs_fmt("activitypub_post_handler bad user %s", uid)); return HTTP_STATUS_NOT_FOUND; } /* if it has a digest, check it now, because later the payload won't be exactly the same */ if ((v = xs_dict_get(req, "digest")) != NULL) { xs *s1 = xs_sha256_base64(payload, p_size); xs *s2 = xs_fmt("SHA-256=%s", s1); if (strcmp(s2, v) != 0) { srv_log(xs_fmt("digest check FAILED")); *body = xs_str_new("bad digest"); *ctype = "text/plain"; status = HTTP_STATUS_BAD_REQUEST; } } /* if the message is from a muted actor, reject it right now */ if (!xs_is_null(v = xs_dict_get(msg, "actor")) && *v) { if (is_muted(&snac, v)) { snac_log(&snac, xs_fmt("rejected message from MUTEd actor %s", v)); *body = xs_str_new("rejected"); *ctype = "text/plain"; status = HTTP_STATUS_FORBIDDEN; } } if (valid_status(status)) { enqueue_input(&snac, msg, req, 0); *ctype = "application/activity+json"; } user_free(&snac); return status; }