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[];\n\n const payload = await response.json();\n const articles: Article[] = (payload?.Data ?? []).map((item: any) => ({\n id: String(item.id ?? item.guid ?? item.url),\n title: String(item.title ?? \"\").trim(),\n source: String(item.source_info?.name ?? item.source ?? \"\").trim(),\n url: String(item.url ?? \"\"),\n imageUrl: String(item.imageurl ?? \"\"),\n publishedAt: Number(item.published_on ?? 0),\n // \"BTC|Market|Trading\" -> [\"BTC\", \"MARKET\", \"TRADING\"]\n categories: String(item.categories ?? \"\")\n .split(\"|\")\n .map((part: string) => part.trim().toUpperCase())\n .filter(Boolean),\n }));\n\n cache = { at: Date.now(), articles };\n return articles;\n}\n\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n const symbol = (url.searchParams.get(\"symbol\") ?? \"\").toUpperCase();\n const limit = Math.min(Number(url.searchParams.get(\"limit\") ?? 6) || 6, 20);\n\n let articles: Article[] = [];\n try {\n articles = await load();\n } catch {\n articles = [];\n }\n\n if (symbol) {\n const wanted = CATEGORY[symbol] ?? symbol;\n const matching = articles.filter((a) => a.categories.includes(wanted));\n // A quiet coin gets the general feed rather than an empty strip — which\n // is what the real screen does when a ticker has no stories of its own.\n articles = matching.length > 0 ? matching : articles;\n }\n\n return Response.json(\n {\n symbol: symbol || null,\n fetchedAt: new Date().toISOString(),\n articles: articles.slice(0, limit).map((a) => ({\n id: a.id,\n title: a.title,\n source: a.source,\n url: a.url,\n imageUrl: a.imageUrl,\n publishedAt: a.publishedAt,\n })),\n },\n {\n headers: {\n \"Access-Control-Allow-Origin\": \"*\",\n \"Cache-Control\": \"public, max-age=300\",\n },\n },\n );\n}\n","/**\n * Crypto news for the Revolut clone's coin screens.\n *\n * GET /?symbol=BTC -> { symbol, articles: [...] }\n * GET /?symbol=ETH&limit=6\n *\n * Sources are Cointelegraph's and Decrypt's public RSS feeds. CryptoCompare\n * was the obvious choice and is now key-only — it answers 401 with \"API key\n * required\" — so this reads RSS instead, which stays open and needs nothing\n * stored on the val.\n *\n * A story is matched to a coin by looking for its name or ticker in the\n * headline. That is cruder than a category field, but the feeds don't publish\n * one, and a wrong-but-plausible tag would be worse than a loose match.\n *\n * Any failure returns an empty list rather than an error: news is decoration\n * on a price screen, and a coin screen that won't load because a feed is down\n * would be a worse app.\n */\n\nconst FEEDS = [\n { url: \"https://cointelegraph.com/rss\", name: \"Cointelegraph\" },\n { url: \"https://decrypt.co/feed\", name: \"Decrypt\" },\n];\n\n/** What to look for in a headline, per ticker. */\nconst TERMS: Record = {\n BTC: [\"bitcoin\", \"btc\"],\n ETH: [\"ethereum\", \"ether\", \"eth\"],\n XRP: [\"xrp\", \"ripple\"],\n SOL: [\"solana\", \"sol\"],\n ADA: [\"cardano\", \"ada\"],\n DOGE: [\"dogecoin\", \"doge\"],\n AVAX: [\"avalanche\", \"avax\"],\n DOT: [\"polkadot\", \"dot\"],\n LINK: [\"chainlink\", \"link\"],\n MATIC: [\"polygon\", \"matic\"],\n LTC: [\"litecoin\", \"ltc\"],\n UNI: [\"uniswap\", \"uni\"],\n};\n\ntype Article = {\n id: string;\n title: string;\n source: string;\n url: string;\n imageUrl: string;\n publishedAt: number;\n};\n\nlet cache: { at: number; articles: Article[] } | null = null;\nconst TTL_MS = 10 * 60 * 1000;\n\n/** Pulls one field out of an RSS , with or without CDATA. */\nfunction field(block: string, tag: string): string {\n const match = block.match(\n new RegExp(`<${tag}[^>]*>([\\\\s\\\\S]*?)`, \"i\"),\n );\n if (!match) return \"\";\n return match[1]\n .replace(//g, \"$1\")\n .replace(/<[^>]+>/g, \"\")\n .replace(/&/g, \"&\")\n .replace(/"/g, '\"')\n .replace(/’|’/g, \"'\")\n .replace(/‘|‘/g, \"'\")\n .replace(/ /g, \" \")\n .trim();\n}\n\n/** The first image the item mentions, whichever way it spells it. */\nfunction image(block: string): string {\n const patterns = [\n /]+url=\"([^\"]+)\"/i,\n /]+url=\"([^\"]+)\"/i,\n /]+url=\"([^\"]+)\"/i,\n /]+src=\"([^\"]+)\"/i,\n ];\n for (const pattern of patterns) {\n const match = block.match(pattern);\n if (match) return match[1];\n }\n return \"\";\n}\n\nasync function readFeed(url: string, name: string): Promise {\n const response = await fetch(url, {\n headers: { \"User-Agent\": \"Mozilla/5.0 (compatible; revolut-clone/1.0)\" },\n });\n if (!response.ok) return [];\n const xml = await response.text();\n\n const items = xml.split(/]/i).slice(1);\n return items.map((block) => {\n const link = field(block, \"link\");\n const date = field(block, \"pubDate\");\n return {\n id: field(block, \"guid\") || link,\n title: field(block, \"title\"),\n source: name,\n url: link,\n imageUrl: image(block),\n publishedAt: date ? Math.floor(new Date(date).getTime() / 1000) : 0,\n };\n }).filter((a) => a.title && a.url);\n}\n\nasync function load(): Promise {\n if (cache && Date.now() - cache.at < TTL_MS) return cache.articles;\n\n // One slow feed shouldn't take the other down with it.\n const results = await Promise.allSettled(\n FEEDS.map((feed) => readFeed(feed.url, feed.name)),\n );\n const articles = results\n .flatMap((result) => (result.status === \"fulfilled\" ? result.value : []))\n .sort((a, b) => b.publishedAt - a.publishedAt);\n\n if (articles.length > 0) cache = { at: Date.now(), articles };\n return articles.length > 0 ? articles : (cache?.articles ?? 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Diff · v3