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snac2/activitypub.c

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/* snac - A simple, minimalistic ActivityPub instance */
/* copyright (c) 2022 - 2023 grunfink / 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 "snac.h"
#include <sys/wait.h>
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 *snac, const char *url, xs_dict **data)
/* request an object */
{
int status;
xs *response = NULL;
xs *payload = NULL;
int p_size;
char *ctype;
/* get from the net */
response = http_signed_request(snac, "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_str_in(ctype, "application/activity+json") != -1 ||
xs_str_in(ctype, "application/ld+json") != -1)
*data = xs_json_loads(payload);
else
status = 500;
}
if (!valid_status(status))
*data = NULL;
return status;
}
int actor_request(snac *snac, const char *actor, xs_dict **data)
/* request an actor */
{
int status, status2;
xs *payload = NULL;
if (data)
*data = NULL;
/* get from disk first */
status = actor_get(snac, actor, data);
if (status != 200) {
/* actor data non-existent or stale: get from the net */
status2 = activitypub_request(snac, actor, &payload);
if (valid_status(status2)) {
/* renew data */
status = actor_add(actor, payload);
if (data != NULL) {
*data = payload;
payload = NULL;
}
}
}
/* 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);
}
else
srv_log(xs_fmt("NOT collected"));
return status;
}
int timeline_request(snac *snac, char **id, d_char **wrk)
/* ensures that an entry and its ancestors are in the timeline */
{
int status = 0;
if (!xs_is_null(*id)) {
/* is the admired object already there? */
if (!object_here(*id)) {
xs *object = NULL;
/* no; download it */
status = activitypub_request(snac, *id, &object);
if (valid_status(status)) {
char *type = xs_dict_get(object, "type");
/* get the id again from the object, as it may be different */
char *nid = xs_dict_get(object, "id");
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) && strcmp(type, "Note") == 0) {
char *actor = xs_dict_get(object, "attributedTo");
/* request (and drop) the actor for this entry */
if (!xs_is_null(actor))
actor_request(snac, actor, NULL);
/* does it have an ancestor? */
char *in_reply_to = xs_dict_get(object, "inReplyTo");
/* recurse! */
timeline_request(snac, &in_reply_to, NULL);
/* finally store */
timeline_add(snac, *id, object);
}
}
}
}
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_pp((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 */
{
char *seckey = xs_dict_get(snac->key, "secret");
return send_to_inbox_raw(snac->actor, seckey, inbox, msg, payload, p_size, timeout);
}
d_char *get_actor_inbox(snac *snac, const char *actor)
/* gets an actor's inbox */
{
xs *data = NULL;
char *v = NULL;
if (valid_status(actor_request(snac, 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, char *actor, char *msg, d_char **payload, int *p_size, int timeout)
/* sends a message to an actor */
{
int status = 400;
xs *inbox = get_actor_inbox(snac, actor);
if (!xs_is_null(inbox))
status = send_to_inbox(snac, inbox, msg, payload, p_size, timeout);
return status;
}
xs_list *recipient_list(snac *snac, const xs_dict *msg, int expand_public)
/* returns the list of recipients for a message */
{
char *to = xs_dict_get(msg, "to");
char *cc = xs_dict_get(msg, "cc");
xs_set rcpts;
int n;
xs_set_init(&rcpts);
char *lists[] = { to, cc, NULL };
for (n = 0; lists[n]; n++) {
char *l = lists[n];
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);
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(snac *snac, const xs_dict *msg)
/* checks if a message is public */
{
xs *rcpts = recipient_list(snac, msg, 0);
return xs_list_in(rcpts, public_address) != -1;
}
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");
if (strcmp(type, "Announce") == 0) {
const char *object = xs_dict_get(c_msg, "object");
if (xs_type(object) == XSTYPE_DICT)
object = xs_dict_get(object, "id");
/* 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 */
if (!following_check(snac, xs_dict_get(c_msg, "actor")))
return 0;
}
/* if it's not a Create, allow */
if (strcmp(type, "Create") != 0)
return 1;
xs_dict *msg = xs_dict_get(c_msg, "object");
xs *rcpts = recipient_list(snac, msg, 0);
xs_list *p = rcpts;
xs_str *v;
while(xs_list_iter(&p, &v)) {
/* explicitly for me? accept */
if (strcmp(v, snac->actor) == 0)
return 2;
/* for someone we follow? (probably cc'ed) accept */
if (following_check(snac, v))
return 5;
}
/* accept if it's by someone we follow */
char *atto = xs_dict_get(msg, "attributedTo");
if (!xs_is_null(atto) && following_check(snac, atto))
return 3;
/* is this message a reply to another? */
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 = xs_dict_get(r_msg, "attributedTo");
/* accept if the replied message is from someone we follow */
if (!xs_is_null(atto) && following_check(snac, atto))
return 4;
}
}
return 0;
}
void process_tags(snac *snac, const char *content, xs_str **n_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;
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)) {
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("<a href=\"%s\" class=\"u-url mention\">%s</a>", 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%s", snac->actor, n);
xs *l = xs_fmt("<a href=\"%s\" class=\"mention hashtag\" rel=\"tag\">%s</a>", 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++;
}
*n_content = nc;
*tag = tl;
}
void notify(snac *snac, const char *type, const char *utype, const char *actor, const xs_dict *msg)
/* notifies the user of relevant events */
{
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 <snac-daemon@%s>", 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 */
char *bot = xs_dict_get(snac->config, "telegram_bot");
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);
/* finally, store it in the notification folder */
if (strcmp(type, "Follow") == 0)
objid = id;
notify_add(snac, type, utype, actor, objid != NULL ? objid : id);
}
/** 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);
/* 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 (object != NULL) {
did = xs_fmt("%s/%s_%s", xs_dict_get(object, "id"), type, ntid);
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;
}
d_char *msg_collection(snac *snac, char *id)
/* creates an empty OrderedCollection message */
{
d_char *msg = msg_base(snac, "OrderedCollection", id, NULL, NULL, NULL);
xs *ol = xs_list_new();
xs *nz = xs_number_new(0);
msg = xs_dict_append(msg, "attributedTo", snac->actor);
msg = xs_dict_append(msg, "orderedItems", ol);
msg = xs_dict_append(msg, "totalItems", nz);
return msg;
}
d_char *msg_accept(snac *snac, char *object, char *to)
/* creates an Accept message (as a response to a Follow) */
{
d_char *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, xs_dict *object)
/* creates an Update message */
{
xs_dict *msg = msg_base(snac, "Update", "@object", snac->actor, "@now", object);
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;
}
d_char *msg_admiration(snac *snac, char *object, char *type)
/* creates a Like or Announce message */
{
xs *a_msg = NULL;
d_char *msg = NULL;
xs *wrk = NULL;
/* call the object */
timeline_request(snac, &object, &wrk);
if (valid_status(object_get(object, &a_msg))) {
xs *rcpts = xs_list_new();
msg = msg_base(snac, type, "@dummy", snac->actor, "@now", object);
if (is_msg_public(snac, a_msg))
rcpts = xs_list_append(rcpts, public_address);
rcpts = xs_list_append(rcpts, xs_dict_get(a_msg, "attributedTo"));
msg = xs_dict_append(msg, "to", rcpts);
}
else
snac_log(snac, xs_fmt("msg_admiration cannot retrieve object %s", object));
return msg;
}
d_char *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 *avtr = NULL;
xs *kid = NULL;
xs *f_bio = NULL;
d_char *msg = msg_base(snac, "Person", snac->actor, NULL, NULL, NULL);
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"));
f_bio = not_really_markdown(xs_dict_get(snac->config, "bio"), NULL);
msg = xs_dict_set(msg, "summary", f_bio);
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);
return msg;
}
xs_dict *msg_create(snac *snac, const xs_dict *object)
/* creates a 'Create' message */
{
xs_dict *msg = msg_base(snac, "Create", "@object", snac->actor, "@now", object);
xs_val *v;
if ((v = xs_dict_get(object, "attributedTo")))
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;
}
d_char *msg_undo(snac *snac, char *object)
/* creates an 'Undo' message */
{
d_char *msg = msg_base(snac, "Undo", "@object", snac->actor, "@now", object);
msg = xs_dict_append(msg, "to", xs_dict_get(object, "object"));
return msg;
}
d_char *msg_delete(snac *snac, char *id)
/* creates a 'Delete' + 'Tombstone' for a local entry */
{
xs *tomb = xs_dict_new();
d_char *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;
d_char *msg = NULL;
int status;
xs *url_or_uid = xs_strip_i(xs_str_new(q));
if (xs_startswith(url_or_uid, "https:/"))
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 */
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,
xs_str *in_reply_to, 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;
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);
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);
if (valid_status(object_get(in_reply_to, &p_msg))) {
/* add this author as recipient */
char *a, *v;
if ((a = xs_dict_get(p_msg, "attributedTo")) && xs_list_in(to, a) == -1)
to = xs_list_append(to, a);
/* add this author to the tag list as a mention */
xs *t_href = NULL;
xs *t_name = NULL;
if (!xs_is_null(a) && valid_status(webfinger_request(a, &t_href, &t_name))) {
xs *t = xs_dict_new();
t = xs_dict_append(t, "type", "Mention");
t = xs_dict_append(t, "href", t_href);
t = xs_dict_append(t, "name", t_name);
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);
/* if this message is public, ours will also be */
if (!priv && is_msg_public(snac, 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 */
process_tags(snac, fc2, &fc1, &tag);
/* create the attachment list, if there are any */
if (!xs_is_null(attach)) {
while (xs_list_iter(&attach, &v)) {
xs *d = xs_dict_new();
char *url = xs_list_get(v, 0);
char *alt = xs_list_get(v, 1);
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) {
char *t;
if ((t = xs_dict_get(v, "type")) != NULL && strcmp(t, "Mention") == 0) {
if ((t = xs_dict_get(v, "href")) != NULL)
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 *ntid = tid(0);
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;
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, "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 *z = xs_number_new(0);
xs *rcpts = xs_list_new();
xs *lopts = xs_list_new();
xs_list *opts;
xs_list *p;
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 */
p = opts;
while (xs_list_iter(&p, &v)) {
const char *name = xs_dict_get(v, "name");
if (name) {
lopts = xs_list_append(lopts, name);
rcnt = xs_dict_set(rcnt, name, z);
}
}
/* 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 = xs_dict_get(obj, "attributedTo");
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);
rcpts = xs_list_append(rcpts, atto);
}
}
}
/* 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);
/* 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, xs_dict *msg, xs_dict *req)
/* processes an ActivityPub message from the input queue */
{
/* actor and type exist, were checked previously */
char *actor = xs_dict_get(msg, "actor");
char *type = xs_dict_get(msg, "type");
xs *actor_o = NULL;
int a_status;
int do_notify = 0;
/* question votes may not have a type */
if (xs_is_null(type))
type = "Note";
if (xs_is_null(actor)) {
snac_debug(snac, 0, xs_fmt("malformed message"));
return 1;
}
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)";
/* reject messages that are not for this user */
if (!is_msg_for_me(snac, msg)) {
snac_debug(snac, 0, 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(snac, msg) &&
!following_check(snac, actor)) {
snac_log(snac, xs_fmt("DM rejected from unknown actor %s", actor));
return 1;
}
}
/* bring the actor */
a_status = actor_request(snac, actor, &actor_o);
/* if the actor does not explicitly exist, discard */
if (a_status == 404 || a_status == 410) {
snac_debug(snac, 1,
xs_fmt("dropping message due to actor error %s %d", actor, a_status));
return 1;
}
if (!valid_status(a_status)) {
/* other actor download errors may need a retry */
snac_debug(snac, 1,
xs_fmt("error requesting actor %s %d -- retry later", actor, a_status));
return 0;
}
/* check the signature */
xs *sig_err = NULL;
if (!check_signature(snac, req, &sig_err)) {
snac_log(snac, xs_fmt("bad signature %s (%s)", actor, sig_err));
srv_archive_error("check_signature", sig_err, req, msg);
return 1;
}
if (strcmp(type, "Follow") == 0) { /** **/
if (!follower_check(snac, actor)) {
xs *f_msg = xs_dup(msg);
xs *reply = msg_accept(snac, f_msg, actor);
enqueue_message(snac, 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) { /** **/
if (strcmp(utype, "Follow") == 0) { /** **/
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
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));
if (strcmp(utype, "Note") == 0) { /** **/
char *id = xs_dict_get(object, "id");
char *in_reply_to = xs_dict_get(object, "inReplyTo");
xs *wrk = NULL;
timeline_request(snac, &in_reply_to, &wrk);
if (timeline_add(snac, id, object)) {
snac_log(snac, xs_fmt("new 'Note' %s %s", 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) { /** **/
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
snac_debug(snac, 1, xs_fmt("ignored 'Create' for object type '%s'", utype));
}
else
if (strcmp(type, "Accept") == 0) { /** **/
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
snac_debug(snac, 1, xs_fmt("ignored 'Accept' for object type '%s'", utype));
}
else
if (strcmp(type, "Like") == 0) { /** **/
if (xs_type(object) == XSTYPE_DICT)
object = xs_dict_get(object, "id");
timeline_admire(snac, object, actor, 1);
snac_log(snac, xs_fmt("new 'Like' %s %s", actor, object));
do_notify = 1;
}
else
if (strcmp(type, "Announce") == 0) { /** **/
xs *a_msg = NULL;
xs *wrk = NULL;
if (xs_type(object) == XSTYPE_DICT)
object = xs_dict_get(object, "id");
timeline_request(snac, &object, &wrk);
if (valid_status(object_get(object, &a_msg))) {
char *who = xs_dict_get(a_msg, "attributedTo");
if (who && !is_muted(snac, who)) {
/* bring the actor */
xs *who_o = NULL;
if (valid_status(actor_request(snac, who, &who_o))) {
timeline_admire(snac, object, actor, 0);
snac_log(snac, xs_fmt("new 'Announce' %s %s", actor, object));
do_notify = 1;
}
else
snac_log(snac, 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_log(snac, xs_fmt("error requesting 'Announce' object %s", object));
}
else
if (strcmp(type, "Update") == 0) { /** **/
if (strcmp(utype, "Person") == 0) {
actor_add(actor, xs_dict_get(msg, "object"));
timeline_touch(snac);
snac_log(snac, xs_fmt("updated actor %s", actor));
}
else
if (strcmp(utype, "Note") == 0) { /** **/
const char *id = xs_dict_get(object, "id");
object_add_ow(id, object);
timeline_touch(snac);
snac_log(snac, xs_fmt("updated post %s", 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
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 (valid_status(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
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(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 */
{
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) {
xs_dict *msg = xs_dict_get(q_item, "message");
xs *rcpts = recipient_list(snac, msg, 1);
xs_set inboxes;
xs_list *p;
xs_str *actor;
xs_set_init(&inboxes);
/* iterate the recipients */
p = rcpts;
while (xs_list_iter(&p, &actor)) {
xs *inbox = get_actor_inbox(snac, 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);
}
else
snac_log(snac, xs_fmt("cannot find inbox for %s", actor));
}
/* if it's public, send to the collected inboxes */
if (is_msg_public(snac, msg)) {
xs *shibx = inbox_list();
xs_str *inbox;
p = shibx;
while (xs_list_iter(&p, &inbox)) {
if (xs_set_add(&inboxes, inbox) == 1)
enqueue_output(snac, msg, inbox, 0);
}
}
xs_set_free(&inboxes);
}
else
if (strcmp(type, "input") == 0) {
/* process the message */
xs_dict *msg = xs_dict_get(q_item, "message");
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)) {
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
snac_log(snac, xs_fmt("unexpected 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;
xs_str *fn;
while (xs_list_iter(&p, &fn)) {
xs *q_item = dequeue(fn);
if (q_item == NULL) {
snac_log(snac, xs_fmt("process_user_queue q_item error"));
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 */
{
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;
xs_str *inbox = xs_dict_get(q_item, "inbox");
xs_str *keyid = xs_dict_get(q_item, "keyid");
xs_str *seckey = xs_dict_get(q_item, "seckey");
xs_dict *msg = xs_dict_get(q_item, "message");
int retries = xs_number_get(xs_dict_get(q_item, "retries"));
xs *payload = NULL;
int p_size = 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;
}
/* deliver */
status = send_to_inbox_raw(keyid, seckey, inbox, msg, &payload, &p_size, retries == 0 ? 3 : 8);
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++;
/* error sending; requeue? */
if (status == 404 || status == 410)
/* 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);
srv_log(xs_fmt("output message: requeue %s #%d", inbox, retries));
}
}
}
else
if (strcmp(type, "email") == 0) {
/* send this email */
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 */
char *bot = xs_dict_get(q_item, "bot");
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, "purge") == 0) {
srv_log(xs_dup("purge start"));
purge_all();
srv_log(xs_dup("purge end"));
}
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;
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 = 200;
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);
char *uid, *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 404;
}
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\"";
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, *v;
p = elems;
while (xs_list_iter(&p, &v)) {
xs *i = NULL;
if (valid_status(object_get_by_md5(v, &i))) {
char *type = xs_dict_get(i, "type");
char *id = xs_dict_get(i, "id");
if (type && id && strcmp(type, "Note") == 0 && xs_startswith(id, snac.actor)) {
i = xs_dict_del(i, "_snac");
list = xs_list_append(list, i);
}
}
}
/* 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);
}
else
status = 404;
if (status == 200 && msg != NULL) {
*body = xs_json_dumps_pp(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 = 202; /* accepted */
char *i_ctype = xs_dict_get(req, "content-type");
snac snac;
char *v;
if (i_ctype == NULL) {
*body = xs_str_new("no content-type");
*ctype = "text/plain";
return 400;
}
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);
if (msg == NULL) {
srv_log(xs_fmt("activitypub_post_handler JSON error %s", q_path));
*body = xs_str_new("JSON error");
*ctype = "text/plain";
status = 400;
}
/* get the user and path */
xs *l = xs_split_n(q_path, "/", 2);
char *uid;
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 404;
}
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 404;
}
/* 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 = 400;
}
}
/* 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 = 403;
}
}
if (valid_status(status)) {
enqueue_input(&snac, msg, req, 0);
*ctype = "application/activity+json";
}
user_free(&snac);
return status;
}
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