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We fetch that feed and parse it into\n * a minimal, well-formed RSS document (title, link, date, author, summary) so\n * it's comfortably accepted by strict validators like Slack's /feed subscribe.\n *\n * Each request fetches the latest upstream feed and serves it with a 10-minute\n * cache, so readers get fresh items roughly every 10 minutes.\n *\n * Subscribe in Slack: /feed subscribe \n */\n\n// The site's native RSS feed for the CCNA tag.\nconst FEED_URL = \"https://coloradosun.com/tag/ccna/feed/\";\nconst SOURCE_URL = \"https://coloradosun.com/tag/ccna/\";\nconst FEED_TITLE = \"The Colorado Sun — CCNA (unofficial)\";\nconst FEED_DESC =\n \"Latest CCNA-tagged stories from The Colorado Sun, via their native tag feed.\";\n\n// A browser-like UA so the upstream WordPress feed answers us.\nconst BROWSER_UA =\n \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0 Safari/537.36\";\n\ninterface Item {\n title: string;\n url: string;\n author: string;\n pub: Date;\n summary: string;\n}\n\nfunction xmlEscape(s: string): string {\n return s\n .replace(/&/g, \"&\")\n .replace(//g, \">\")\n .replace(/\"/g, \""\")\n .replace(/'/g, \"'\");\n}\n\n// Decode the HTML entities WordPress actually uses.\nfunction decodeEntities(s: string): string {\n const named: Record = {\n \"&\": \"&\",\n \"<\": \"<\",\n \">\": \">\",\n \""\": '\"',\n \"'\": \"'\",\n \"'\": \"'\",\n \"'\": \"'\",\n \" \": \" \",\n };\n return s\n .replace(/&#x([0-9a-fA-F]+);/g, (_, h) => String.fromCodePoint(parseInt(h, 16)))\n .replace(/&#(\\d+);/g, (_, d) => String.fromCodePoint(parseInt(d, 10)))\n .replace(/&[a-zA-Z]+;|�?39;/g, (m) => named[m] ?? m);\n}\n\nfunction stripTags(s: string): string {\n return s.replace(/<[^>]*>/g, \"\").trim();\n}\n\n// Pull one tag's content out of an item block.\nfunction grab(block: string, tag: string): string {\n const re = new RegExp(`<${tag}(?:\\\\s[^>]*)?>(?:)?`, \"i\");\n const m = re.exec(block);\n return m ? decodeEntities(stripTags(m[1])) : \"\";\n}\n\n// Parse the upstream WordPress RSS XML into clean items, newest first.\nfunction parse(rssXml: string): Item[] {\n const items: Item[] = [];\n const seen = new Set();\n const blocks = rssXml.match(/[\\s\\S]*?<\\/item>/gi) ?? 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