, <link>, <pubDate>, <source>.\n const itemRe = /<item>([\\s\\S]*?)<\\/item>/gi;\n let m: RegExpExecArray | null;\n while ((m = itemRe.exec(rssXml)) !== null) {\n const block = m[1];\n const titleM = /<title>(?:<!\\[CDATA\\[)?([\\s\\S]*?)(?:\\]\\]>)?<\\/title>/i.exec(block);\n if (!titleM) continue;\n let title = titleM[1];\n if (title.includes(\" - \")) title = title.split(\" - \")[0]; // strip \" - Colorado Public Radio\"\n title = decodeEntities(stripTags(title)).trim();\n if (!title) continue;\n\n const linkM = /<link>(?:<!\\[CDATA\\[)?([\\s\\S]*?)(?:\\]\\]>)?<\\/link>/i.exec(block);\n const url = linkM ? decodeEntities(linkM[1]).trim() : \"\";\n if (!url || seen.has(url)) continue;\n\n const pubM = /<pubDate>([^<]*)<\\/pubDate>/i.exec(block);\n const pub = pubM ? new Date(pubM[1]) : new Date();\n\n // CPR's feed uses <category> tags; Google News uses <source url>. Grab\n // whichever is present for the section label.\n const cats = [...block.matchAll(/<category>(?:<!\\[CDATA\\[)?([\\s\\S]*?)(?:\\]\\]>)?<\\/category>/gi)]\n .map((c) => decodeEntities(stripTags(c[1])))\n .filter(Boolean);\n const sourceM = /<source[^>]*>([\\s\\S]*?)<\\/source>/i.exec(block);\n const section = cats.length\n ? cats.join(\", \")\n : sourceM\n ? decodeEntities(stripTags(sourceM[1]))\n : \"CPR News\";\n\n // Politics check: match the headline, or any category tag.\n const isPolitics = POLITICS_KEYWORDS.test(title) ||\n cats.some((c) => POLITICS_KEYWORDS.test(c));\n if (POLITICS_ONLY && !isPolitics) continue;\n\n // Drop stories older than the cutoff.\n const cutoff = Date.now() - MAX_AGE_DAYS * 24 * 60 * 60 * 1000;\n if (pub.getTime() < cutoff) continue;\n\n seen.add(url);\n items.push({ title, url, pub, section });\n }\n\n // Keep newest-first, de-duplicated.\n items.sort((a, b) => b.pub.getTime() - a.pub.getTime());\n return items;\n}\n\nfunction buildRss(items: Item[], selfUrl: string): string {\n const now = new Date().toUTCString();\n const parts: string[] = [\n '<?xml version=\"1.0\" encoding=\"UTF-8\"?>',\n '<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">',\n \"<channel>\",\n `<title>${xmlEscape(FEED

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Google News' public RSS search feed (site:cpr.org) is kept as a\n * fallback in case cpr.org ever blocks serverless egress.\n *\n * Subscribe to this URL in Slack: /feed subscribe \n */\n\nconst SOURCE_URL = \"https://www.cpr.org/category/politics/\";\nconst FEED_TITLE = \"CPR News — Government and Politics (unofficial)\";\nconst FEED_DESC =\n \"Latest Government and Politics stories from Colorado Public Radio.\";\n\n// Drop stories older than this many days (Google News relevance ranking\n// otherwise surfaces old evergreen stories alongside fresh ones).\nconst MAX_AGE_DAYS = 30;\n\n// Set true to drop stories whose headline doesn't match a politics keyword.\nconst POLITICS_ONLY = true;\nconst POLITICS_KEYWORDS =\n /\\b(politic|election|ballot|vote|govern|senat|congress|legislat|lawmaker|senator|representative|bill|law|judge|court|state|federal|county|district|border|immigration)\\b/i;\n\ninterface Item {\n title: string;\n url: string;\n pub: Date;\n section: 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 handful of HTML entities CPR headlines actually use.\nfunction decodeEntities(s: string): string {\n const named: Record = {\n \"&\": \"&\",\n \"<\": \"<\",\n \">\": \">\",\n \""\": '\"',\n \"'\": \"'\",\n \"'\": \"'\",\n \"'\": \"'\",\n \"’\": \"\\u2019\",\n \"‘\": \"\\u2018\",\n \"“\": \"\\u201C\",\n \"”\": \"\\u201D\",\n \"–\": \"\\u2013\",\n \"—\": \"\\u2014\",\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// Parse Google News RSS XML into our items.\nfunction parse(rssXml: string): Item[] {\n const items: Item[] = [];\n const seen = new Set();\n\n // Each block: , <link>, <pubDate>, <source>.\n const itemRe = /<item>([\\s\\S]*?)<\\/item>/gi;\n let m: RegExpExecArray | null;\n while ((m = itemRe.exec(rssXml)) !== null) {\n const block = m[1];\n const titleM = /<title>(?:<!\\[CDATA\\[)?([\\s\\S]*?)(?:\\]\\]>)?<\\/title>/i.exec(block);\n if (!titleM) continue;\n let title = titleM[1];\n if (title.includes(\" - \")) title = title.split(\" - \")[0]; // strip \" - Colorado Public Radio\"\n title = decodeEntities(stripTags(title)).trim();\n if (!title) continue;\n\n const linkM = /<link>(?:<!\\[CDATA\\[)?([\\s\\S]*?)(?:\\]\\]>)?<\\/link>/i.exec(block);\n const url = linkM ? decodeEntities(linkM[1]).trim() : \"\";\n if (!url || seen.has(url)) continue;\n\n const pubM = /<pubDate>([^<]*)<\\/pubDate>/i.exec(block);\n const pub = pubM ? new Date(pubM[1]) : new Date();\n\n // CPR's feed uses <category> tags; Google News uses <source url>. Grab\n // whichever is present for the section label.\n const cats = [...block.matchAll(/<category>(?:<!\\[CDATA\\[)?([\\s\\S]*?)(?:\\]\\]>)?<\\/category>/gi)]\n .map((c) => decodeEntities(stripTags(c[1])))\n .filter(Boolean);\n const sourceM = /<source[^>]*>([\\s\\S]*?)<\\/source>/i.exec(block);\n const section = cats.length\n ? cats.join(\", \")\n : sourceM\n ? decodeEntities(stripTags(sourceM[1]))\n : \"CPR News\";\n\n // Politics check: match the headline, or any category tag.\n const isPolitics = POLITICS_KEYWORDS.test(title) ||\n cats.some((c) => POLITICS_KEYWORDS.test(c));\n if (POLITICS_ONLY && !isPolitics) continue;\n\n // Drop stories older than the cutoff.\n const cutoff = Date.now() - MAX_AGE_DAYS * 24 * 60 * 60 * 1000;\n if (pub.getTime() < cutoff) continue;\n\n seen.add(url);\n items.push({ title, url, pub, section });\n }\n\n // Keep newest-first, de-duplicated.\n items.sort((a, b) => b.pub.getTime() - a.pub.getTime());\n return items;\n}\n\nfunction buildRss(items: Item[], selfUrl: string): string {\n const now = new Date().toUTCString();\n const parts: string[] = [\n '<?xml version=\"1.0\" encoding=\"UTF-8\"?>',\n '<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">',\n \"<channel>\",\n `<title>${xmlEscape(FEED_TITLE)}`,\n `${xmlEscape(SOURCE_URL)}`,\n `${xmlEscape(FEED_DESC)}`,\n \"en-us\",\n `${now}`,\n ``,\n ];\n\n for (const it of items.slice(0, 50)) {\n parts.push(\n \"\",\n `${xmlEscape(it.title)}`,\n `${xmlEscape(it.url)}`,\n `${xmlEscape(it.url)}`,\n `${xmlEscape(it.section)}`,\n `${xmlEscape(it.section.split(\", \")[0])}`,\n `${it.pub.toUTCString()}`,\n \"\",\n );\n }\n\n parts.push(\"\", \"\");\n return parts.join(\"\\n\");\n}\n\n// Try each candidate upstream in order until one responds with a feed we can\n// use. CPR's own feed is the most reliable source when reachable (real story\n// URLs and category tags); Google News is the fallback when cpr.org blocks us.\nconst UPSTREAMS = [\n \"https://www.cpr.org/feed/\",\n \"https://news.google.com/rss/search?q=site:cpr.org%20politics&hl=en-US&gl=US&ceid=US:en\",\n \"https://news.google.com/rss/search?q=site:cpr.org&hl=en-US&gl=US&ceid=US:en\",\n];\n\nasync function fetchXml(): Promise<{ xml: string; source: string }> {\n const headers = {\n \"User-Agent\":\n \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0 Safari/537.36\",\n \"Accept\": \"application/rss+xml, application/xml, text/xml;q=0.9, */*;q=0.8\",\n \"Accept-Language\": \"en-US,en;q=0.9\",\n };\n for (const url of UPSTREAMS) {\n const controller = new AbortController();\n const timer = setTimeout(() => controller.abort(), 10000);\n try {\n const resp = await fetch(url, { signal: controller.signal, headers });\n if (resp.ok) {\n const xml = await resp.text();\n if (xml.includes(\"\")) return { xml, source: url };\n }\n } catch {\n // try the next source\n } finally {\n clearTimeout(timer);\n }\n }\n throw new Error(\n \"All upstream sources were unreachable or blocked (Google News is \" +\n \"rate-limiting Val Town's servers). Try again shortly.\",\n );\n}\n\nexport default async function (req: Request): Promise {\n try {\n const { xml: rssXml } = await fetchXml();\n const items = parse(rssXml);\n if (items.length === 0) {\n return new Response(\n \"No articles parsed — Google News or filter may have changed.\",\n { status: 500 },\n );\n }\n const rss = buildRss(items, req.url);\n return new Response(rss, {\n headers: {\n \"Content-Type\": \"application/rss+xml; charset=utf-8\",\n // Cache 10 min so frequent reader polls don't hammer the upstream.\n \"Cache-Control\": \"public, max-age=600\",\n },\n });\n } catch (err) {\n return new Response(`Error: ${err instanceof Error ? err.message : err}`, {\n status: 500,\n });\n 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