99 lines
4.7 KiB
JavaScript
99 lines
4.7 KiB
JavaScript
// ═══════════════════════════════════════════════════════════
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// marketdata.js — server 端抓取歷史股價（給「價格走勢」與「回測」共用）
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// 來源：Yahoo v8 chart（免 crumb、公開），含還原股價(adjclose)。
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// 只負責抓取＋正規化；快取由 server.js 以 DB 處理（節省 API）。
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// ═══════════════════════════════════════════════════════════
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const UA = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124 Safari/537.36';
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export const RANGES = ['3mo', '6mo', '1y', '2y', '5y', '10y', 'max'];
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export const INTERVALS = ['1d', '1wk', '1mo'];
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async function jget(url, ms = 12000) {
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const ctrl = new AbortController();
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const timer = setTimeout(() => ctrl.abort(), ms);
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try {
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const res = await fetch(url, {
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headers: { 'User-Agent': UA, Accept: 'application/json,text/plain,*/*', 'Accept-Language': 'en-US,en;q=0.9' },
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signal: ctrl.signal,
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});
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if (!res.ok) throw new Error(`HTTP ${res.status}`);
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return await res.json();
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} finally { clearTimeout(timer); }
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}
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async function jgetH(url, headers, ms = 12000) {
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const ctrl = new AbortController();
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const timer = setTimeout(() => ctrl.abort(), ms);
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try {
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const res = await fetch(url, { headers: { 'User-Agent': UA, ...headers }, signal: ctrl.signal });
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if (!res.ok) throw new Error(`HTTP ${res.status}`);
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return await res.json();
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} finally { clearTimeout(timer); }
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}
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// range → 起始日期門檻
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const RANGE_MONTHS = { '3mo': 3, '6mo': 6, '1y': 12, '2y': 24, '5y': 60, '10y': 120, max: null };
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function cutoffDate(range) {
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const m = RANGE_MONTHS[range];
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if (m == null) return '1980-01-01';
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const d = new Date(); d.setMonth(d.getMonth() - m);
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return d.toISOString().slice(0, 10);
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}
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// Nasdaq 免金鑰每日歷史後備（Yahoo 429 時用，美股最完整）。
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async function fetchNasdaq(symbol, range) {
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const from = cutoffDate(range), to = new Date().toISOString().slice(0, 10);
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const H = { Accept: 'application/json', Origin: 'https://www.nasdaq.com', Referer: 'https://www.nasdaq.com/' };
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for (const assetclass of ['stocks', 'etf']) {
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let j;
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try { j = await jgetH(`https://api.nasdaq.com/api/quote/${encodeURIComponent(symbol)}/chart?assetclass=${assetclass}&fromdate=${from}&todate=${to}`, H); }
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catch { continue; }
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const chart = j?.data?.chart;
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if (!Array.isArray(chart) || chart.length < 2) continue;
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const points = chart
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.map(c => ({ date: new Date(c.x).toISOString().slice(0, 10), close: c.y, adjclose: c.y }))
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.filter(p => p.close != null);
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if (points.length >= 2) {
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return { symbol, name: j.data.company || null, currency: 'USD', range, interval: '1d', points, source: 'Nasdaq' };
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}
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}
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return null;
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}
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// 回傳 { symbol, name, currency, points:[{date:'YYYY-MM-DD', close, adjclose}] }
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export async function getHistory(symbol, range = '5y', interval = '1d') {
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if (!RANGES.includes(range)) range = '5y';
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if (!INTERVALS.includes(interval)) interval = '1d';
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let lastErr = null;
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for (const host of ['query1', 'query2']) {
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try {
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const url = `https://${host}.finance.yahoo.com/v8/finance/chart/${encodeURIComponent(symbol)}`
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+ `?range=${range}&interval=${interval}&includeAdjustedClose=true`;
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const d = await jget(url);
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const r = d?.chart?.result?.[0];
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if (!r || !Array.isArray(r.timestamp)) { lastErr = new Error('Yahoo 無歷史資料'); continue; }
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const ts = r.timestamp;
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const close = r.indicators?.quote?.[0]?.close || [];
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const adj = r.indicators?.adjclose?.[0]?.adjclose || [];
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const points = [];
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for (let i = 0; i < ts.length; i++) {
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const c = close[i];
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if (c == null) continue; // 跳過缺值（停牌/未成交）
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const a = (adj[i] != null) ? adj[i] : c;
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points.push({ date: new Date(ts[i] * 1000).toISOString().slice(0, 10), close: c, adjclose: a });
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}
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if (points.length < 2) { lastErr = new Error('歷史資料點過少'); continue; }
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return {
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symbol: r.meta?.symbol || symbol,
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name: r.meta?.shortName || r.meta?.longName || null,
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currency: r.meta?.currency || null,
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range, interval, source: 'Yahoo Finance',
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points,
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};
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} catch (e) { lastErr = e; }
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}
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// Yahoo 失敗（常見 429）→ 改用 Nasdaq 免金鑰歷史
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const fallback = await fetchNasdaq(symbol, range).catch(() => null);
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if (fallback) return fallback;
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throw lastErr || new Error('無法取得歷史股價');
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}
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