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RSSBot/1.0; +https://valtown.com)\",\n },\n });\n\n if (!res.ok) {\n throw new Error(`Failed to fetch NatGeo: ${res.status} ${res.statusText}`);\n }\n\n const html = await res.text();\n\n // Extract all anchor tags with NatGeo article URLs along with their inner text.\n // Pattern: href=\"...article/...\" followed eventually by the anchor's text content.\n // NatGeo renders the same article link multiple times (image + text link).\n // We grab all occurrences and prefer the one with the longer/better looking title.\n const anchorPattern =\n /]*href=\"(https:\\/\\/www\\.nationalgeographic\\.com\\/(science|history|animals|health|environment|travel|adventure|photography|impact|culture)\\/(?:article|best-of-the-world-\\d{4}\\/article)\\/[^\"]+)\"[^>]*>([^<]*)<\\/a>/gi;\n\n const seen = new Map();\n\n let match: RegExpExecArray | null;\n while ((match = anchorPattern.exec(html)) !== null) {\n const url = match[1];\n const category = match[2];\n const rawTitle = match[3].trim();\n\n // Skip empty inner text (icon-only or image links)\n if (rawTitle.length < 5) continue;\n\n const title = escapeXml(rawTitle);\n\n // Keep the entry if it's new or if this title is longer (more descriptive)\n const existing = seen.get(url);\n if (!existing || title.length > existing.title.length) {\n seen.set(url, {\n title,\n url,\n category: escapeXml(capitalize(category)),\n });\n }\n }\n\n // Fall back to slug-derived titles for any URL matched without an anchor title\n // (shouldn't happen with the improved regex, but belt-and-suspenders)\n const fallbackPattern =\n /href=\"(https:\\/\\/www\\.nationalgeographic\\.com\\/(science|history|animals|health|environment|travel|adventure|photography|impact|culture)\\/(?:article|best-of-the-world-\\d{4}\\/article)\\/[^\"]+)\"/g;\n\n while ((match = fallbackPattern.exec(html)) !== null) {\n const url = match[1];\n if (!seen.has(url)) {\n const category = match[2];\n seen.set(url, {\n title: escapeXml(urlToTitle(url)),\n url,\n category: escapeXml(capitalize(category)),\n });\n }\n }\n\n return Array.from(seen.values());\n}\n\nfunction urlToTitle(url: string): string {\n const slug = url.split(\"/\").pop() || \"\";\n return slug\n .replace(/-/g, \" \")\n .replace(/\\b\\w/g, (c) => c.toUpperCase());\n}\n\nfunction capitalize(s: string): string {\n return s.charAt(0).toUpperCase() + s.slice(1);\n}\n\nfunction escapeXml(str: string): string {\n return str\n .replace(/&/g, \"&\")\n .replace(//g, \">\")\n .replace(/\"/g, \""\")\n .replace(/'/g, \"'\");\n}\n\nfunction buildRSS(articles: Article[]): string {\n const now = new Date().toUTCString();\n\n const items = articles\n .map(\n (a) => `\n \n ${a.title}\n ${a.url}\n ${a.url}\n ${a.category}\n ${now}\n `,\n )\n .join(\"\\n\");\n\n return `\n\n \n National Geographic - Latest Stories\n ${NATGEO_URL}\n Latest stories from National Geographic\n en-us\n ${now}\n \n ${items}\n \n`;\n}\n\nexport default async function handler(req: Request): Promise {\n try {\n const articles = await scrapeNatGeo();\n\n if (articles.length === 0) {\n return new Response(\"No articles found\", { status: 500 });\n }\n\n const rss = buildRSS(articles);\n\n return new Response(rss, {\n headers: {\n \"Content-Type\": \"application/rss+xml; charset=utf-8\",\n \"Cache-Control\": \"public, max-age=900\", // cache for 15 minutes\n },\n });\n } catch (err) {\n const message = err instanceof Error ? err.message : String(err);\n return new Response(`Error generating feed: ${message}`, { status: 500 });\n }\n}\n","// National Geographic RSS Feed Generator\n// Scrapes the NatGeo homepage and outputs a valid RSS 2.0 feed\n\nconst NATGEO_URL = \"https://www.nationalgeographic.com\";\n\n// Date pattern on article pages, e.g. \"January 5, 2026\" or \"March 30, 2026\"\nconst DATE_PATTERN =\n /\\b(January|February|March|April|May|June|July|August|September|October|November|December)\\s+(\\d{1,2}),\\s+(\\d{4})\\b/;\n\ninterface Article {\n title: string;\n url: string;\n category: string;\n pubDate: string; // RFC 2822 date string, or empty string if unknown\n}\n\nasync function scrapeNatGeo(): Promise {\n const res = await fetch(NATGEO_URL, {\n headers: {\n \"User-Agent\":\n \"Mozilla/5.0 (compatible; RSSBot/1.0; +https://valtown.com)\",\n },\n });\n\n if (!res.ok) {\n throw new Error(`Failed to fetch NatGeo: ${res.status} ${res.statusText}`);\n }\n\n const html = await res.text();\n\n // Extract all anchor tags with NatGeo article URLs along with their inner text.\n const anchorPattern =\n /]*href=\"(https:\\/\\/www\\.nationalgeographic\\.com\\/(science|history|animals|health|environment|travel|adventure|photography|impact|culture)\\/(?:article|best-of-the-world-\\d{4}\\/article)\\/[^\"]+)\"[^>]*>([^<]*)<\\/a>/gi;\n\n const seen = new Map>();\n\n let match: RegExpExecArray | null;\n while ((match = anchorPattern.exec(html)) !== null) {\n const url = match[1];\n const category = match[2];\n const rawTitle = match[3].trim();\n\n if (rawTitle.length < 5) continue;\n\n const title = escapeXml(rawTitle);\n const existing = seen.get(url);\n if (!existing || title.length > existing.title.length) {\n seen.set(url, { title, url, category: escapeXml(capitalize(category)) });\n }\n }\n\n // Fallback: catch URLs without anchor text\n const fallbackPattern =\n /href=\"(https:\\/\\/www\\.nationalgeographic\\.com\\/(science|history|animals|health|environment|travel|adventure|photography|impact|culture)\\/(?:article|best-of-the-world-\\d{4}\\/article)\\/[^\"]+)\"/g;\n\n while ((match = fallbackPattern.exec(html)) !== null) {\n const url = match[1];\n if (!seen.has(url)) {\n const category = match[2];\n seen.set(url, {\n title: escapeXml(urlToTitle(url)),\n url,\n category: escapeXml(capitalize(category)),\n });\n }\n }\n\n const articles = Array.from(seen.values());\n\n // Fetch publish dates from each article page in parallel, max 8 at a time\n const withDates = await mapWithConcurrency(articles, 8, async (a) => {\n const pubDate = await fetchPublishDate(a.url);\n return { ...a, pubDate };\n });\n\n return withDates;\n}\n\nasync function fetchPublishDate(url: string): Promise {\n try {\n const res = await fetch(url, {\n headers: {\n \"User-Agent\":\n \"Mozilla/5.0 (compatible; RSSBot/1.0; +https://valtown.com)\",\n },\n });\n if (!res.ok) return \"\";\n const html = await res.text();\n const m = DATE_PATTERN.exec(html);\n if (!m) return \"\";\n // Parse \"Month DD, YYYY\" into an RFC 2822 date string\n const date = new Date(`${m[1]} ${m[2]}, ${m[3]}`);\n return isNaN(date.getTime()) ? \"\" : date.toUTCString();\n } catch {\n return \"\";\n }\n}\n\n// Run `fn` over `items` with at most `concurrency` in-flight at once\nasync function mapWithConcurrency(\n items: T[],\n concurrency: number,\n fn: (item: T) => Promise,\n): Promise {\n const results: U[] = new Array(items.length);\n let index = 0;\n\n async function worker() {\n while (index < items.length) {\n const i = index++;\n results[i] = await fn(items[i]);\n }\n }\n\n const workers = Array.from({ length: concurrency }, () => worker());\n await Promise.all(workers);\n return results;\n}\n\nfunction urlToTitle(url: string): string {\n const slug = url.split(\"/\").pop() || \"\";\n return slug\n .replace(/-/g, \" \")\n .replace(/\\b\\w/g, (c) => c.toUpperCase());\n}\n\nfunction capitalize(s: string): string {\n return s.charAt(0).toUpperCase() + s.slice(1);\n}\n\nfunction escapeXml(str: string): string {\n return str\n .replace(/&/g, \"&\")\n .replace(//g, \">\")\n .replace(/\"/g, \""\")\n .replace(/'/g, \"'\");\n}\n\nfunction buildRSS(articles: Article[]): string {\n const now = new Date().toUTCString();\n\n const items = articles\n .map(\n (a) => `\n \n ${a.title}\n ${a.url}\n ${a.url}\n ${a.category}\n ${a.pubDate || now}\n `,\n )\n .join(\"\\n\");\n\n return `\n\n \n National Geographic - Latest Stories\n ${NATGEO_URL}\n Latest stories from National Geographic\n en-us\n ${now}\n \n ${items}\n \n`;\n}\n\nexport default async function handler(req: Request): Promise {\n try {\n const articles = await scrapeNatGeo();\n\n if (articles.length === 0) {\n return new Response(\"No articles found\", { status: 500 });\n }\n\n const rss = buildRSS(articles);\n\n return new Response(rss, {\n headers: {\n \"Content-Type\": \"application/rss+xml; 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Diff · v5