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/* snac - A simple, minimalistic ActivityPub instance */
/* copyright (c) 2025 grunfink et al. / MIT license */
#include "xs.h"
#include "xs_html.h"
#include "xs_regex.h"
#include "xs_time.h"
#include "xs_match.h"
#include "xs_curl.h"
#include "snac.h"
xs_str *rss_from_timeline(snac *user, const xs_list *timeline,
const char *title, const char *link, const char *desc)
/* converts a timeline to rss */
{
xs_html *rss = xs_html_tag("rss",
xs_html_attr("xmlns:content", "http:/" "/purl.org/rss/1.0/modules/content/"),
xs_html_attr("version", "2.0"),
xs_html_attr("xmlns:atom", "http:/" "/www.w3.org/2005/Atom"));
xs_html *channel = xs_html_tag("channel",
xs_html_tag("title",
xs_html_text(title)),
xs_html_tag("language",
xs_html_text("en")),
xs_html_tag("link",
xs_html_text(link)),
xs_html_sctag("atom:link",
xs_html_attr("href", link),
xs_html_attr("rel", "self"),
xs_html_attr("type", "application/rss+xml")),
xs_html_tag("generator",
xs_html_text(USER_AGENT)),
xs_html_tag("description",
xs_html_text(desc)));
xs_html_add(rss, channel);
int cnt = 0;
const char *v;
xs_list_foreach(timeline, v) {
xs *msg = NULL;
if (user) {
if (!valid_status(timeline_get_by_md5(user, v, &msg)))
continue;
}
else {
if (!valid_status(object_get_by_md5(v, &msg)))
continue;
}
const char *id = xs_dict_get(msg, "id");
const char *content = xs_dict_get(msg, "content");
const char *published = xs_dict_get(msg, "published");
if (user && !xs_startswith(id, user->actor))
continue;
if (!id || !content || !published)
continue;
/* create a title with the first line of the content */
xs *title = xs_replace(content, "<br>", "\n");
title = xs_regex_replace_i(title, "<[^>]+>", " ");
title = xs_regex_replace_i(title, "&[^;]+;", " ");
int i;
for (i = 0; title[i] && title[i] != '\n' && i < 50; i++);
if (title[i] != '\0') {
title[i] = '\0';
title = xs_str_cat(title, "...");
}
title = xs_strip_i(title);
/* convert the date */
time_t t = xs_parse_iso_date(published, 0);
xs *rss_date = xs_str_utctime(t, "%a, %d %b %Y %T +0000");
/* if it's the first one, add it to the header */
if (cnt == 0)
xs_html_add(channel,
xs_html_tag("lastBuildDate",
xs_html_text(rss_date)));
xs_html_add(channel,
xs_html_tag("item",
xs_html_tag("title",
xs_html_text(title)),
xs_html_tag("link",
xs_html_text(id)),
xs_html_tag("guid",
xs_html_text(id)),
xs_html_tag("pubDate",
xs_html_text(rss_date)),
xs_html_tag("description",
xs_html_text(content))));
cnt++;
}
return xs_html_render_s(rss, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
}
void rss_to_timeline(snac *user, const char *url)
/* reads an RSS and inserts all ActivityPub posts into the user's timeline */
{
if (!xs_startswith(url, "https:/") && !xs_startswith(url, "http:/"))
return;
xs *hdrs = xs_dict_new();
hdrs = xs_dict_set(hdrs, "accept", "application/rss+xml");
hdrs = xs_dict_set(hdrs, "user-agent", USER_AGENT);
xs *payload = NULL;
int status;
int p_size;
xs *rsp = xs_http_request("GET", url, hdrs, NULL, 0, &status, &payload, &p_size, 0);
if (!valid_status(status) || !xs_is_string(payload))
return;
/* not an RSS? done */
const char *ctype = xs_dict_get(rsp, "content-type");
if (!xs_is_string(ctype) || xs_str_in(ctype, "application/rss+xml") == -1)
return;
snac_log(user, xs_fmt("parsing RSS %s", url));
/* yes, parsing is done with regexes (now I have two problems blah blah blah) */
xs *links = xs_regex_select(payload, "<link>[^<]+</link>");
const char *link;
xs_list_foreach(links, link) {
xs *l = xs_replace(link, "<link>", "");
char *p = strchr(l, '<');
if (p == NULL)
continue;
*p = '\0';
/* skip this same URL */
if (strcmp(l, url) == 0)
continue;
snac_debug(user, 1, xs_fmt("RSS link: %s", l));
if (timeline_here(user, l)) {
snac_debug(user, 1, xs_fmt("RSS entry already in timeline %s", l));
continue;
}
/* special trick for Mastodon: convert from the alternate format */
if (strchr(l, '@') != NULL) {
xs *l2 = xs_split(l, "/");
if (xs_list_len(l2) == 5) {
const char *uid = xs_list_get(l2, 3);
if (*uid == '@') {
xs *guessed_id = xs_fmt("https:/" "/%s/users/%s/statuses/%s",
xs_list_get(l2, 2), uid + 1, xs_list_get(l2, -1));
if (timeline_here(user, guessed_id)) {
snac_debug(user, 1, xs_fmt("RSS entry already in timeline (alt) %s", guessed_id));
continue;
}
}
}
}
xs *obj = NULL;
if (!valid_status(object_get(l, &obj))) {
/* object is not here: bring it */
if (!valid_status(activitypub_request(user, l, &obj)))
continue;
}
if (xs_is_dict(obj)) {
const char *id = xs_dict_get(obj, "id");
const char *type = xs_dict_get(obj, "type");
const char *attr_to = get_atto(obj);
if (!xs_is_string(id) || !xs_is_string(type) || !xs_is_string(attr_to))
continue;
if (!xs_match(type, POSTLIKE_OBJECT_TYPE))
continue;
if (timeline_here(user, id)) {
snac_debug(user, 1, xs_fmt("RSS entry already in timeline (id) %s", id));
continue;
}
if (!valid_status(actor_request(user, attr_to, NULL)))
continue;
timeline_add(user, id, obj);
}
}
}
void rss_poll_hashtags(void)
/* parses all RSS from all users */
{
xs *list = user_list();
const char *uid;
xs_list_foreach(list, uid) {
snac user;
if (user_open(&user, uid)) {
const xs_list *rss = xs_dict_get(user.config, "followed_hashtags");
if (xs_is_list(rss)) {
const char *url;
xs_list_foreach(rss, url)
rss_to_timeline(&user, url);
}
user_free(&user);
}
}
}
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