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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 "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");
}
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