added rss generator

backend/public/src/utils/mod.rs

@@ -0,0 +1 @@
+pub mod rss;

backend/public/src/utils/rss.rs

@@ -0,0 +1,90 @@
+use crate::routes::posts;
+use std::collections::HashMap;
+use xml::escape::escape_str_pcdata;
+
+pub struct RssEntry {
+    pub title: String,
+    pub link: String,
+    pub description: Option<String>,
+    pub created_at: String,
+    pub author: String,
+    pub guid: String,
+}
+
+impl From<posts::Post> for RssEntry {
+    fn from(post: posts::Post) -> Self {
+        let web_url = std::env::var("BASE_URI_WEB").expect("Environment variable not found");
+        let post_url = format!("{}{}{}", web_url, "/posts/", post.post_id.to_string());
+        let author_full_name = format!("{} {}", post.first_name.unwrap(), post.last_name.unwrap());
+
+        Self {
+            title: post.title.clone(),
+            link: post_url.clone(),
+            description: Some(post.body.clone()),
+            created_at: post
+                .created_at
+                .expect("No timestamp was available")
+                .to_rfc2822(),
+            author: author_full_name,
+            guid: post_url.clone(),
+        }
+    }
+}
+
+impl RssEntry {
+    pub fn to_item(&self) -> String {
+        format!(
+            r#"
+            <item>
+                <title><![CDATA[{}]]></title>
+                <description><![CDATA[{}]]></description>
+                <pubDate>{}</pubDate>
+                <link>{}</link>
+                <guid isPermaLink="true">{}</guid>
+            </item>
+            "#,
+            self.title,
+            self.description.clone().unwrap_or_default(),
+            self.created_at,
+            self.guid,
+            self.guid
+        )
+    }
+}
+
+pub fn generate_rss(
+    title: &str,
+    description: &str,
+    link: &str,
+    posts: &HashMap<String, posts::Post>,
+) -> String {
+    println!("{:?}", posts);
+    let values = posts.clone().into_values();
+    println!("{:?}", values);
+
+    let rss_entries = values
+        .map(|p| p.into())
+        .map(|r: RssEntry| r.to_item())
+        .collect::<String>();
+
+    let safe_title = escape_str_pcdata(title);
+    let safe_description = escape_str_pcdata(description);
+    println!("{:?}", rss_entries);
+
+    format!(
+        r#"<?xml version="1.0" encoding="UTF-8"?>
+            <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+                <channel>
+                  <title>{safe_title}</title>
+                    <description>{safe_description}</description>
+                    <link>{link}</link>
+                    <language>en-us</language>
+                    <ttl>60</ttl>
+                    <generator>Kyouma 1.0.0-SE</generator>
+                    <atom:link href="https://wyattjmiller.com/posts.xml" rel="self" type="application/rss+xml" />
+                    {}
+                </channel>
+            </rss>"#,
+        rss_entries
+    )
+}