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IPs used for automation\n// should be whitelisted\" (http 403). Yani ons altın kaynağı asıl sorunun\n// kaynağıydı, TCMB (kur) tarafı hep doğruydu.\n// - Ons altın (XAU/USD) kaynağı bu yüzden Yahoo Finance'in herkese açık,\n// anahtarsız \"chart\" uç noktasına değiştirildi (sembol: XAUUSD=X, günlük\n// kapanış serisi). Bu servis val.town gibi sunucu taraflı otomasyonlardan\n// yaygın şekilde kullanılıyor ve bot korumasıyla LBMA kadar agresif değil.\n// - LBMA, ikinci bir yedek kaynak olarak KORUNDU (Yahoo da engellenirse diye)\n// — iki kaynak da başarısız olursa &debug=1 artık HER İKİSİNİN ham hata/\n// durumunu birlikte gösteriyor.\n// - v5.1: İlk denemede kullanılan \"XAUUSD=X\" sembolü Yahoo'da 404 verdi\n// (\"symbol may be delisted\" — yani böyle bir sembol yok/tanınmıyor). Onun\n// yerine önce \"GC=F\" (COMEX altın vadeli işlem sözleşmesi — en yaygın/\n// güvenilir, ons altına çok yakın fiyatlanır) deneniyor; olmazsa XAUUSD=X\n// yine de ikinci sıra yedek olarak bırakıldı (bölgeye göre değişebiliyor).\n//\n// Kullanım: GET https://?date=2022-03-15\n// Hata ayıklama: GET https://?date=2022-03-15&debug=1\n\nconst BROWSER_UA =\n \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36\";\n\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n const dateParam = url.searchParams.get(\"date\");\n const debug = url.searchParams.get(\"debug\") === \"1\";\n if (!dateParam || !/^\\d{4}-\\d{2}-\\d{2}$/.test(dateParam)) {\n return Response.json({\n error: \"Geçerli bir 'date' parametresi gerekli (YYYY-MM-DD)\",\n }, { status: 400 });\n }\n\n // ---------- TCMB: USD/TRY + EUR/TRY (DOĞRULANDI, sorun bu tarafta değildi) ----------\n const tcmbLog: Array<{ url: string; status: number | string }> = [];\n async function fetchTcmbRatesForDate(\n dateStr: string,\n triesLeft = 10,\n ): Promise<{ usdTry: number; eurTry: number; actualDate: string } | null> {\n if (triesLeft <= 0) return null;\n const d = new Date(dateStr + \"T00:00:00Z\");\n const dd = String(d.getUTCDate()).padStart(2, \"0\");\n const mm = String(d.getUTCMonth() + 1).padStart(2, \"0\");\n const yyyy = d.getUTCFullYear();\n const tcmbUrl =\n `https://www.tcmb.gov.tr/kurlar/${yyyy}${mm}/${dd}${mm}${yyyy}.xml`;\n try {\n const res = await fetch(tcmbUrl, {\n headers: { \"User-Agent\": BROWSER_UA, Accept: \"*/*\" },\n });\n if (debug) tcmbLog.push({ url: tcmbUrl, status: res.status });\n if (res.ok) {\n const xml = await res.text();\n const usdMatch = xml.match(\n /Kod=\"USD\"[\\s\\S]*?([\\d.,]+)<\\/ForexSelling>/,\n );\n const eurMatch = xml.match(\n /Kod=\"EUR\"[\\s\\S]*?([\\d.,]+)<\\/ForexSelling>/,\n );\n if (usdMatch && eurMatch) {\n const usdTry = parseFloat(usdMatch[1].replace(\",\", \".\"));\n const eurTry = parseFloat(eurMatch[1].replace(\",\", \".\"));\n if (usdTry > 0 && eurTry > 0) {\n return { usdTry, eurTry, actualDate: `${yyyy}-${mm}-${dd}` };\n }\n }\n }\n } catch (e) {\n if (debug) tcmbLog.push({ url: tcmbUrl, status: \"hata: \" + String(e) });\n }\n const prev = new Date(d.getTime() - 86400000);\n return fetchTcmbRatesForDate(\n prev.toISOString().slice(0, 10),\n triesLeft - 1,\n );\n }\n\n // ---------- Ons altın (XAU/USD): önce Yahoo Finance (birden fazla sembol denenir), olmazsa LBMA yedeği ----------\n const xauLog: any = { yahoo: {}, lbma: {} };\n\n // \"XAUUSD=X\" Yahoo'da 404 verdi (\"symbol may be delisted\") — GEÇERSİZ sembol.\n // Önce COMEX altın vadeli işlem sözleşmesini (GC=F, en yaygın/güvenilir, ons\n // altına çok yakın fiyatlanır) deniyoruz, o da olmazsa XAUUSD=X'i yine de\n // yedek olarak bırakıyoruz (bölgeye göre farklı sembol setleri dönebiliyor).\n const YAHOO_SYMBOLS = [\"GC=F\", \"XAUUSD=X\"];\n\n async function fetchXauUsdViaYahooSymbol(\n dateStr: string,\n symbol: string,\n ): Promise<{ xauUsd: number; actualDate: string } | null> {\n const targetSec = Math.floor(\n new Date(dateStr + \"T23:59:59Z\").getTime() / 1000,\n );\n const period1 = targetSec - 12 * 86400; // 12 gün geriye pay — hafta sonu/tatil boşluklarını kapatmak için\n const period2 = targetSec + 86400;\n const yUrl = `https://query1.finance.yahoo.com/v8/finance/chart/${\n encodeURIComponent(symbol)\n }?period1=${period1}&period2=${period2}&interval=1d`;\n const log: any = {};\n xauLog.yahoo[symbol] = log;\n try {\n const res = await fetch(yUrl, {\n headers: {\n \"User-Agent\": BROWSER_UA,\n Accept: \"application/json\",\n Referer: \"https://finance.yahoo.com/\",\n },\n });\n const text = await res.text();\n if (debug) {\n log.status = res.status;\n log.bodyPreview = text.slice(0, 300);\n }\n if (!res.ok) return null;\n const json = JSON.parse(text);\n const result = json?.chart?.result?.[0];\n const timestamps: number[] = result?.timestamp || [];\n const closes: (number | null)[] = result?.indicators?.quote?.[0]?.close ||\n [];\n if (debug) log.pointCount = timestamps.length;\n if (!timestamps.length) return null;\n\n let best: { ts: number; price: number } | null = null;\n for (let i = 0; i < timestamps.length; i++) {\n const ts = timestamps[i];\n const price = closes[i];\n if (\n ts <= targetSec && price != null && price > 0 &&\n (!best || ts > best.ts)\n ) {\n best = { ts, price };\n }\n }\n if (!best) return null;\n const actualDate = new Date(best.ts * 1000).toISOString().slice(0, 10);\n return { xauUsd: best.price, actualDate };\n } catch (e) {\n if (debug) log.error = String(e);\n return null;\n }\n }\n\n async function fetchXauUsdViaYahoo(\n dateStr: string,\n ): Promise<{ xauUsd: number; actualDate: string } | null> {\n for (const symbol of YAHOO_SYMBOLS) {\n const r = await fetchXauUsdViaYahooSymbol(dateStr, symbol);\n if (r) return r;\n }\n return null;\n }\n\n // Yedek kaynak — LBMA'nın resmi günlük fiyat arşivi (Yahoo da engellenirse diye korunuyor).\n async function fetchXauUsdViaLbma(\n dateStr: string,\n ): Promise<{ xauUsd: number; actualDate: string } | null> {\n const lbmaUrl = \"https://prices.lbma.org.uk/json/gold_am.json\";\n try {\n const res = await fetch(lbmaUrl, {\n headers: { \"User-Agent\": BROWSER_UA, Accept: \"application/json\" },\n });\n const text = await res.text();\n if (debug) {\n xauLog.lbma.status = res.status;\n xauLog.lbma.bodyPreview = text.slice(0, 300);\n }\n if (!res.ok) return null;\n const json = JSON.parse(text);\n let entries: Array<{ ts: number; 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