systemprompt_generator/rss/
xml.rs

1//! Pure-function RSS 2.0 XML serialisation.
2//!
3//! Copyright (c) systemprompt.io — Business Source License 1.1.
4//! See <https://systemprompt.io> for licensing details.
5
6use chrono::{DateTime, Utc};
7
8#[derive(Debug, Clone)]
9pub struct RssItem {
10    pub title: String,
11    pub link: String,
12    pub description: String,
13    pub pub_date: DateTime<Utc>,
14    pub guid: String,
15    pub author: Option<String>,
16}
17
18#[derive(Debug, Clone)]
19pub struct RssChannel {
20    pub title: String,
21    pub link: String,
22    pub description: String,
23    pub items: Vec<RssItem>,
24}
25
26fn escape_xml(s: &str) -> String {
27    s.replace('&', "&amp;")
28        .replace('<', "&lt;")
29        .replace('>', "&gt;")
30        .replace('"', "&quot;")
31        .replace('\'', "&apos;")
32}
33
34fn format_rfc2822(dt: &DateTime<Utc>) -> String {
35    dt.format("%a, %d %b %Y %H:%M:%S +0000").to_string()
36}
37
38pub fn build_rss_xml(channel: &RssChannel) -> String {
39    let mut xml = String::with_capacity(8192);
40
41    xml.push_str(r#"<?xml version="1.0" encoding="UTF-8"?>"#);
42    xml.push('\n');
43    xml.push_str(r#"<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">"#);
44    xml.push('\n');
45    xml.push_str("<channel>\n");
46
47    xml.push_str(&format!(
48        "  <title>{}</title>\n",
49        escape_xml(&channel.title)
50    ));
51    xml.push_str(&format!("  <link>{}</link>\n", escape_xml(&channel.link)));
52    xml.push_str(&format!(
53        "  <description>{}</description>\n",
54        escape_xml(&channel.description)
55    ));
56    xml.push_str(&format!(
57        r#"  <atom:link href="{}/feed.xml" rel="self" type="application/rss+xml"/>"#,
58        escape_xml(&channel.link)
59    ));
60    xml.push('\n');
61
62    for item in &channel.items {
63        xml.push_str("  <item>\n");
64        xml.push_str(&format!("    <title>{}</title>\n", escape_xml(&item.title)));
65        xml.push_str(&format!("    <link>{}</link>\n", escape_xml(&item.link)));
66        xml.push_str(&format!(
67            "    <description>{}</description>\n",
68            escape_xml(&item.description)
69        ));
70        xml.push_str(&format!(
71            "    <pubDate>{}</pubDate>\n",
72            format_rfc2822(&item.pub_date)
73        ));
74        xml.push_str(&format!(
75            "    <guid isPermaLink=\"true\">{}</guid>\n",
76            escape_xml(&item.guid)
77        ));
78        if let Some(ref author) = item.author {
79            xml.push_str(&format!("    <author>{}</author>\n", escape_xml(author)));
80        }
81        xml.push_str("  </item>\n");
82    }
83
84    xml.push_str("</channel>\n");
85    xml.push_str("</rss>\n");
86
87    xml
88}
systemprompt_generator/rss/xml.rs

systemprompt_generator/rss/
xml.rs
