feat: add blog_options and rss feed generation

app/server/rss/index.js

@@ -0,0 +1,13 @@
+import { RssGenerator } from "./rssGenerator.js";
+
+let generator = null;
+
+export default (() => {
+  if (!generator) {
+    generator = Object.freeze(new RssGenerator({
+      filePath: '/home/node/rss/rss.xml',
+    }));
+  } 
+
+  return generator;
+})();

app/server/rss/rssGenerator.js

@@ -0,0 +1,123 @@
+import fs from 'node:fs';
+
+export class RssGenerator {
+  maxItem = 10;
+  items = [];
+  channel = {};
+
+  constructor(options) {
+    this.options = options;
+  }
+
+  // TODO: move to pass an option parameter and iterate over the key/values
+  setChannel (title, description, link, pubDate) {
+    this.channel.title = title;
+    this.channel.description = description;
+    this.channel.link = link;
+    this.channel.pubDate = pubDate;
+    
+    return this;
+  }
+
+  addItem (item) {
+    if (!this.isItemValid(item)) {
+      console.error('[RssGenerator] addItem: item invalid.', item);
+      return this;
+    }
+
+    this.items.push(item);
+    
+    if (this.items.lenght > this.maxItem) {
+      this.items.shift();
+    }
+
+    return this;
+  }
+  
+  isItemValid(item) {
+    return true;
+  }
+
+  generateFile() {
+    let data = '';
+
+    data += '<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\"><channel>';
+    data += this.#generateChannelInfos();
+    data += this.#generateItems();
+    data += '</channel></rss>';
+
+    this.#saveFile(data);
+    return this;
+  }
+
+  #generateChannelInfos() {
+    let infos = '';
+
+    infos += `<title>${this.channel.title}</title>\n`;
+    infos += `<description>${this.channel.description}</description>\n`;
+    infos += `<link>${this.channel.link}</link>\n`;
+    infos += `<pubDate>${RssGenerator.formatDate(this.channel.pubDate)}</pubDate>\n`;
+    infos += `<atom:link href="${this.channel.link}/rss.xml" rel="self" type="application/rss+xml" />\n`;
+
+    return infos;
+  }
+
+  #generateItems() {
+    let data = '';
+
+    for (const item of this.items) {
+      data += '<item>\n';
+      data += `<title>${item.title}</title>\n`;
+      data += `<link>${item.link}</link>\n`;
+      data += `<guid>${item.link}</guid>\n`;
+      data += `<description>${item.description}</description>\n`;
+      data += '</item>\n';
+    }
+
+    return data;
+  }
+
+  static formatDate(date) {
+    return new Intl.DateTimeFormat("en-GB", {
+      hour12: false,
+      weekday: "short",
+      year: "numeric",
+      month: "short",
+      day: "2-digit",
+      hour: "2-digit",
+      minute: "2-digit",
+      second: "2-digit",
+      timeZone: "Europe/London",
+    }).formatToParts(date)
+      .filter(el => el.type !== "literal") 
+      .reduce((acc, cur) => {
+        switch (cur.type) {
+          case "weekday":
+            acc += `${cur.value}, `;
+            break;
+          case "hour":
+          case "minute":
+            acc += `${cur.value}:`;
+            break;
+          case "timeZoneName":
+            acc += cur.value;
+            break;
+          default:
+            acc += `${cur.value} `;
+            break;
+        }
+        return acc;
+      }, '')
+      .concat(" GMT");
+  }
+
+  #saveFile(data) {
+    try {
+      fs.writeFileSync(this.options.filePath, data, { encoding: 'utf8' });
+    } catch (err) {
+      console.error('[RssGenerator] saveFile - ERROR');
+      console.error(err);
+    }
+  }
+}
+

app/server/rss/template.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<rss version="2.0">
+  <channel>
+    <title>$TITLE</title>
+    <description>$DESCRIPTION</description>
+    <link>$LINK</link>
+  <channel>
+</rss>