611 lines
23 KiB
JavaScript
611 lines
23 KiB
JavaScript
const fastify = require('fastify')({
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logger: false, // 关闭默认日志，极大提升吞吐量
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disableRequestLogging: true, // 关闭请求日志
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connectionTimeout: 30000, // 快速释放死连接
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keepAliveTimeout: 5000, // 调整 Keep-Alive
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});
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const ffmpeg = require('fluent-ffmpeg');
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const { request } = require('undici'); // High-performance HTTP client
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const sharp = require('sharp');
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const fs = require('fs');
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const path = require('path');
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const crypto = require('crypto');
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const EventEmitter = require('events');
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// Configuration
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const PORT = process.env.PORT || 9520;
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const API_BASE = 'http://183.6.121.121:9558/api';
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const CACHE_DIR = process.env.CACHE_DIR ? path.resolve(process.env.CACHE_DIR) : path.join(__dirname, '.cache');
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// Ensure cache directory exists
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if (!fs.existsSync(CACHE_DIR)) {
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fs.mkdirSync(CACHE_DIR, { recursive: true });
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}
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// Active downloads manager
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const activeDownloads = new Map();
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// Global Error Handling to prevent crash
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process.on('uncaughtException', (err) => {
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console.error(`[${new Date().toISOString()}] Uncaught Exception:`, err);
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});
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process.on('unhandledRejection', (reason, promise) => {
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console.error(`[${new Date().toISOString()}] Unhandled Rejection:`, reason);
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});
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// Helper to fetch JSON from API using Undici (Faster than http.get)
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async function fetchApi(token, query) {
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const apiUrl = new URL(API_BASE);
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if (query) {
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Object.entries(query).forEach(([key, value]) => {
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apiUrl.searchParams.set(key, value);
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});
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}
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const { statusCode, body } = await request(apiUrl, {
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method: 'GET',
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headers: {
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'Connection': 'keep-alive',
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'token': token
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},
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bodyTimeout: 5000,
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headersTimeout: 5000
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});
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if (statusCode !== 200) {
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throw new Error(`API Status Code: ${statusCode}`);
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}
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const data = await body.json();
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return data;
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}
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/**
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* 获取内容路径
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* @param {*} uniqid
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* @returns
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*/
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function getContentPath(uniqid) {
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const subDir = 'content/' + uniqid.substring(0, 1);
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const dir = path.join(CACHE_DIR, subDir);
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if (!fs.existsSync(dir)) {
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fs.mkdirSync(dir, { recursive: true });
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}
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return path.join(dir, `${uniqid}.data`);
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}
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function getMetaPath(key) {
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const subDir = 'meta/' + key.substring(0, 1);
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const dir = path.join(CACHE_DIR, subDir);
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if (!fs.existsSync(dir)) {
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fs.mkdirSync(dir, { recursive: true });
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}
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return path.join(dir, `${key}.meta`)
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}
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function getTokenKey(token) {
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return crypto.createHash('md5').update(token).digest('hex');
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}
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function normalizeApiData(metaJson) {
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if (metaJson && metaJson.api && metaJson.api.data) {
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return metaJson.api;
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}
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return metaJson;
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}
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function isValidThumbSpec(thumb) {
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return thumb && typeof thumb === 'object' && !Array.isArray(thumb) && Number.isFinite(thumb.w) && thumb.w > 0;
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}
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function getMimeFromUrl(u) {
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const ext = path.extname(new URL(u).pathname).toLowerCase();
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if (ext === '.png') return 'image/png';
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if (ext === '.webp') return 'image/webp';
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if (ext === '.gif') return 'image/gif';
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if (ext === '.jpg' || ext === '.jpeg' || ext === '.jfif') return 'image/jpeg';
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if (ext === '.mp4' || ext === '.m4v' || ext === '.mov') return 'video/mp4';
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if (ext === '.webm') return 'video/webm';
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return 'image/jpeg';
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}
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/**
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* 生成缩略图并缓存
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* @param {*} reply
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* @param {*} apiData
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* @param {*} contentPath
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* @returns
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*/
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async function generateThumbAndCache(reply, apiData, contentPath) {
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const srcPath = contentPath;
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const dir = path.dirname(srcPath);
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const base = path.basename(srcPath);
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const thumbFinal = path.join(dir, base.replace('.data', `.thumb`));
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const metaThumbPath = contentPath.replace('.data', '.thumb.meta');
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if (fs.existsSync(thumbFinal) && fs.existsSync(metaThumbPath)) {
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const st = fs.statSync(thumbFinal);
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if (st.size > 0) {
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// metaPath 读取 metadata
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const metaJson = JSON.parse(fs.readFileSync(metaThumbPath, 'utf8'));
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// inputFormat
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const inputFormat = metaJson.inputFormat || 'webp';
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const responseHeaders = {
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...apiData.data.headers, ...{
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'Content-Type': `image/${inputFormat === 'jpg' ? 'jpeg' : inputFormat}`,
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'Content-Length': st.size,
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'Accept-Ranges': 'bytes',
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}
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};
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reply.headers(responseHeaders);
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return fs.createReadStream(thumbFinal);
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}
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}
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try {
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console.log('Generating thumb:', srcPath);
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let attempts = 0;
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while (!fs.existsSync(srcPath) && attempts < 80) {
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await new Promise(r => setTimeout(r, 100));
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attempts++;
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}
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if (!fs.existsSync(srcPath)) {
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console.log('Thumb source file not found:', srcPath);
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reply.code(500);
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return 'Thumb source file not found';
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}
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let stat = fs.statSync(srcPath);
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attempts = 0;
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while (stat.size <= 0 && attempts < 80) {
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await new Promise(r => setTimeout(r, 100));
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attempts++;
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stat = fs.statSync(srcPath);
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}
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if (stat.size <= 0) {
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reply.code(500);
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return 'Thumb source file is empty';
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}
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const fit = (apiData.data.thumb && apiData.data.thumb.fit === 'max') ? 'inside' : 'cover';
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const width = (apiData.data.thumb && apiData.data.thumb.w) ? apiData.data.thumb.w : 100;
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const contentType = (apiData.data.headers && apiData.data.headers['content-type']) || getMimeFromUrl(apiData.data.url) || 'image/jpeg';
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const preferredFmt = contentType.includes('png') ? 'png' : contentType.includes('webp') ? 'webp' : 'jpeg';
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if (contentType.includes('video/')) {
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console.log('Generating video thumb:', srcPath);
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const thumbTemp = path.join(dir, base.replace('.data', `.thumb.webp.tmp`));
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const { spawn } = require('child_process');
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const args = ['-ss', '1', '-i', srcPath, '-frames:v', '1', '-vf', `scale=${width}:-2`, '-y', thumbTemp];
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await new Promise((resolve, reject) => { const p = spawn('ffmpeg', args, { stdio: 'ignore' }); p.on('error', reject); p.on('close', c => c === 0 ? resolve() : reject(new Error(`ffmpeg exit ${c}`))); });
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try { fs.renameSync(thumbTemp, thumbFinal); } catch (e) { if (fs.existsSync(thumbFinal)) { try { fs.unlinkSync(thumbFinal); } catch (_) { } fs.renameSync(thumbTemp, thumbFinal); } else { throw e; } }
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await fs.promises.writeFile(metaThumbPath, JSON.stringify({ api: apiData, headers: apiData.data.headers || {}, srcSize: stat.size, inputFormat: 'video' }));
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const tstat = fs.statSync(thumbFinal);
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reply.headers({ 'Content-Type': 'image/webp', 'Content-Length': tstat.size, 'Accept-Ranges': 'bytes', 'Access-Control-Allow-Origin': '*' });
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return fs.createReadStream(thumbFinal);
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}
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const inputMeta = await sharp(srcPath).metadata();
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const outFmt = preferredFmt || inputMeta.format || 'jpeg';
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const thumbTemp = path.join(dir, base.replace('.data', `.thumb.tmp`));
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const pipeline = sharp(srcPath).resize({ width, fit });
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if (outFmt === 'jpeg') pipeline.jpeg({ quality: 85 });
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else if (outFmt === 'png') pipeline.png();
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else pipeline.webp({ quality: 80 });
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await pipeline.toFile(thumbTemp);
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try {
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fs.renameSync(thumbTemp, thumbFinal);
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} catch (e) {
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if (fs.existsSync(thumbFinal)) {
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try { fs.unlinkSync(thumbFinal); } catch (_) { }
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fs.renameSync(thumbTemp, thumbFinal);
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} else {
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throw e;
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}
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}
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await fs.promises.writeFile(metaThumbPath, JSON.stringify({ api: apiData, headers: apiData.data.headers || {}, srcSize: stat.size, inputFormat: inputMeta.format || null }));
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const tstat = fs.statSync(thumbFinal);
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const responseHeaders = {
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...apiData.data.headers, ...{
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'Content-Type': `image/${outFmt === 'jpeg' ? 'jpeg' : outFmt}`,
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'Content-Length': tstat.size,
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'Accept-Ranges': 'bytes',
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}
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};
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reply.headers(responseHeaders);
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return fs.createReadStream(thumbFinal);
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} catch (e) {
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reply.code(500);
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return 'Thumb generation failed:' + e.message;
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} finally {
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// cleanup leftover temp if any
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const dir = path.dirname(srcPath);
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const base = path.basename(srcPath);
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const thumbTemp = path.join(dir, base.replace('.data', `.thumb.tmp`));
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try { if (fs.existsSync(thumbTemp)) fs.unlinkSync(thumbTemp); } catch (_) { }
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}
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}
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// Serve existing file
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function serveCompletedCache(reply, apiData, contentPath) {
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const content = contentPath;
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const responseHeaders = { ...apiData.data.headers };
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if (!responseHeaders['Access-Control-Allow-Origin']) {
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responseHeaders['Access-Control-Allow-Origin'] = '*';
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}
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// Fastify handles Range requests automatically if we send the stream?
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// Actually, for full control over custom headers + Range, we often need manual handling or plugins.
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// But serving a raw stream in Fastify usually just pipes it.
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// For "High Performance", letting nginx handle static files is best, but here we do it in Node.
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// We will stick to the manual Range logic for consistency with previous "growing file" support.
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// To support Range properly with Fastify + Stream, we can set headers and return stream.
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// But for "growing" files, we need our custom pump logic.
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// For completed files, we can use fs.createReadStream.
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const range = reply.request.headers.range;
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const stat = fs.statSync(content); // Sync is okay for startup/metadata, but Async preferred in high-perf.
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// In strict high-perf, use fs.promises.stat or cache stats.
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const totalSize = stat.size;
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if (range) {
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const parts = range.replace(/bytes=/, "").split("-");
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const start = parseInt(parts[0], 10);
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const end = parts[1] ? parseInt(parts[1], 10) : totalSize - 1;
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responseHeaders['Content-Range'] = `bytes ${start}-${end}/${totalSize}`;
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responseHeaders['Accept-Ranges'] = 'bytes';
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responseHeaders['Content-Length'] = (end - start) + 1;
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reply.code(206).headers(responseHeaders);
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return fs.createReadStream(content, { start, end });
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} else {
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responseHeaders['Content-Length'] = totalSize;
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responseHeaders['Accept-Ranges'] = 'bytes';
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reply.code(200).headers(responseHeaders);
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return fs.createReadStream(content);
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}
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}
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// Download and Serve logic
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async function downloadAndServe(reply, apiData, contentPath, key) {
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let task = activeDownloads.get(key);
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// 如果任务已完成或出错但最终文件不存在，重置任务以便重新下载
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if (task && (task.done || task.error)) {
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const hasFinal = fs.existsSync(contentPath);
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if (!hasFinal) {
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activeDownloads.delete(key);
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task = null;
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}
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}
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const isValidTask = task && typeof task === 'object' && task.emitter instanceof EventEmitter && !task.done;
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if (!isValidTask) {
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const finalPath = contentPath;
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const tempPath = path.join(path.dirname(finalPath), `${key}_${crypto.randomBytes(8).toString('hex')}.tmp`);
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task = {
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emitter: new EventEmitter(),
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currentSize: 0,
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totalSize: 0,
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path: tempPath,
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done: false,
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error: null
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};
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task.emitter.setMaxListeners(0);
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// Prevent crash if no listeners for error event
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task.emitter.on('error', (err) => {
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console.error(`[${new Date().toISOString()}] Download Error (Key: ${key}):`, err.message);
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});
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activeDownloads.set(key, task);
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// Start Download
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const targetUrl = apiData.data.url;
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// Use Undici stream for high performance download
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// stream() is efficient for piping
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const { stream } = require('undici');
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stream(targetUrl, { method: 'GET' }, (res) => {
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const { statusCode, headers } = res;
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if (statusCode !== 200) {
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const err = new Error(`Upstream ${statusCode}`);
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task.error = err;
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task.emitter.emit('error', err);
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activeDownloads.delete(key);
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const ws = fs.createWriteStream('/dev/null');
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ws.end();
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return ws;
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}
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task.totalSize = parseInt(headers['content-length'] || '0', 10);
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const fileStream = fs.createWriteStream(task.path);
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fileStream.on('error', (err) => {
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task.emitter.emit('error', err);
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});
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const originalWrite = fileStream.write.bind(fileStream);
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fileStream.write = (chunk, encoding, cb) => {
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const ret = originalWrite(chunk, encoding, cb);
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task.currentSize += chunk.length;
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task.emitter.emit('progress', task.currentSize);
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return ret;
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};
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return fileStream;
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}).then(() => {
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try {
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const finalPath = contentPath;
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try {
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fs.renameSync(task.path, finalPath);
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} catch (err) {
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if (fs.existsSync(finalPath)) {
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try { fs.unlinkSync(finalPath); } catch (_) { }
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fs.renameSync(task.path, finalPath);
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} else {
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throw err;
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}
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}
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task.path = finalPath;
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task.done = true;
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task.emitter.emit('done');
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} catch (err) {
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task.error = err;
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task.emitter.emit('error', err);
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fs.unlink(task.path, () => { });
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} finally {
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activeDownloads.delete(key);
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}
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}).catch(err => {
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task.error = err;
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task.emitter.emit('error', err);
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activeDownloads.delete(key);
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fs.unlink(task.path, () => { });
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});
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}
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if (task.done && fs.existsSync(contentPath)) {
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console.log('Download completed:', key);
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if (isValidThumbSpec(apiData.data.thumb)) {
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return generateThumbAndCache(reply, apiData, contentPath).catch(() => { });
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}
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return serveCompletedCache(reply, apiData, contentPath);//reply, apiData, contentPath
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}
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console.log('Downloading:', key);
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if (isValidThumbSpec(apiData.data.thumb)) {
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return generateThumbAndCache(reply, apiData, contentPath).catch(() => { });
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}
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// Serve growing file
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return serveGrowingFile(reply, task, apiData);
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}
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function serveGrowingFile(reply, task, apiData) {
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const responseHeaders = { ...apiData.data.headers };
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if (!responseHeaders['Access-Control-Allow-Origin']) responseHeaders['Access-Control-Allow-Origin'] = '*';
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// 移除可能来自meta的固定 Content-Length，避免增长流卡死
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delete responseHeaders['Content-Length'];
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delete responseHeaders['content-length'];
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const range = reply.request.headers.range;
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let start = 0;
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if (range) {
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const parts = range.replace(/bytes=/, "").split("-");
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start = parseInt(parts[0], 10) || 0;
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responseHeaders['Accept-Ranges'] = 'bytes';
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// 当总大小未知时，不能返回206，否则客户端会等待无效范围导致卡死
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if (task.totalSize) {
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responseHeaders['Content-Range'] = `bytes ${start}-${task.totalSize - 1}/${task.totalSize}`;
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responseHeaders['Content-Length'] = task.totalSize - start;
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reply.code(206);
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} else {
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reply.code(200);
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}
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} else {
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if (task.totalSize) responseHeaders['Content-Length'] = task.totalSize;
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reply.code(200);
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}
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reply.headers(responseHeaders);
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// Custom stream to pump data from file to response
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const { Readable } = require('stream');
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return new Readable({
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read(size) {
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const self = this;
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let bytesSent = start; // State needs to be per-stream instance.
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// Wait, 'read' is called multiple times. We need to store state outside or on 'this'.
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if (this._bytesSent === undefined) this._bytesSent = start;
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pump(this);
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function pump(stream) {
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if (stream.destroyed) return;
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if (task.error) {
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stream.destroy(task.error);
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return;
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}
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// Open FD if needed
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if (!stream._fd) {
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fs.open(task.path, 'r', (err, fd) => {
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if (err) {
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if (err.code === 'ENOENT') {
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setTimeout(() => pump(stream), 100);
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} else {
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stream.destroy(err);
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}
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return;
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}
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stream._fd = fd;
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pump(stream);
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});
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return;
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}
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const available = task.currentSize - stream._bytesSent;
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if (available > 0) {
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const buffer = Buffer.alloc(Math.min(available, 64 * 1024));
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fs.read(stream._fd, buffer, 0, buffer.length, stream._bytesSent, (err, bytesRead) => {
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if (err) {
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stream.destroy(err);
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return;
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}
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if (bytesRead > 0) {
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stream._bytesSent += bytesRead;
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const keepPushing = stream.push(buffer.slice(0, bytesRead));
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// If push returns false, we should stop and wait for _read again?
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// Actually Node streams: if push returns true, we can push more.
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// But here we just push what we have and wait for next _read call or event?
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// Standard implementation: push until it returns false.
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// But for "live" tailing, we might want to just push what we have and exit,
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// expecting _read to be called again by consumer.
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} else {
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wait(stream);
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}
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});
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} else {
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if (task.done) {
|
||
fs.close(stream._fd, () => { });
|
||
stream.push(null); // EOF
|
||
} else {
|
||
wait(stream);
|
||
}
|
||
}
|
||
}
|
||
|
||
function wait(stream) {
|
||
// Wait for progress
|
||
const onProgress = () => {
|
||
cleanup();
|
||
pump(stream);
|
||
};
|
||
const onDone = () => {
|
||
cleanup();
|
||
pump(stream);
|
||
};
|
||
const onError = (err) => {
|
||
cleanup();
|
||
stream.destroy(err);
|
||
};
|
||
|
||
const cleanup = () => {
|
||
task.emitter.off('progress', onProgress);
|
||
task.emitter.off('done', onDone);
|
||
task.emitter.off('error', onError);
|
||
};
|
||
|
||
task.emitter.once('progress', onProgress);
|
||
task.emitter.once('done', onDone); // Check done state
|
||
task.emitter.once('error', onError);
|
||
|
||
// If stream destroyed, remove listeners?
|
||
// Readable.read is active, so stream is active.
|
||
}
|
||
},
|
||
destroy(err, cb) {
|
||
if (this._fd) fs.close(this._fd, () => { });
|
||
cb(err);
|
||
}
|
||
});
|
||
}
|
||
|
||
// Global Fastify Error Handler
|
||
fastify.setErrorHandler((error, request, reply) => {
|
||
request.log.error(error);
|
||
const statusCode = error.statusCode || 500;
|
||
reply.status(statusCode).send({
|
||
error: error.name,
|
||
message: error.message,
|
||
statusCode
|
||
});
|
||
});
|
||
|
||
// Routes
|
||
fastify.get('/favicon.ico', async (request, reply) => {
|
||
reply.code(204);
|
||
return '';
|
||
});
|
||
|
||
fastify.get('/*', async (request, reply) => {
|
||
let token = (request.raw && request.raw.url ? request.raw.url : request.url).split('?')[0].substring(1);
|
||
|
||
if (!token) {
|
||
reply.code(400);
|
||
return 'Missing token';
|
||
}
|
||
|
||
// .well-known 目录下的文件直接返回
|
||
if (token.startsWith('.well-known')) {
|
||
reply.code(200);
|
||
return '';
|
||
}
|
||
|
||
// 获取nocache 参数
|
||
const nocache = request.query.nocache ? true : false;
|
||
|
||
try {
|
||
const key = getTokenKey(token);
|
||
const metaPath = getMetaPath(key);
|
||
const ONE_DAY_MS = 24 * 60 * 60 * 1000;
|
||
let apiData = null;
|
||
if (fs.existsSync(metaPath) && !nocache) {
|
||
try {
|
||
const stat = fs.statSync(metaPath);
|
||
if ((Date.now() - stat.mtimeMs) < ONE_DAY_MS) {
|
||
const parsed = JSON.parse(fs.readFileSync(metaPath, 'utf8'));
|
||
apiData = normalizeApiData(parsed);
|
||
}
|
||
} catch (e) {
|
||
apiData = null;
|
||
}
|
||
}
|
||
// 如果内容文件不存在，则强制刷新API，避免使用过期URL
|
||
if (!apiData) {
|
||
apiData = await fetchApi(token, request.query);
|
||
if (apiData.code !== 200 || !apiData.data || !apiData.data.url) {
|
||
console.log('Invalid API response:', apiData, token);
|
||
reply.code(404);
|
||
return 'Invalid API response';
|
||
}
|
||
fs.writeFileSync(metaPath, JSON.stringify(apiData));
|
||
}
|
||
|
||
|
||
if (apiData.code !== 200 || !apiData.data || !apiData.data.url) {
|
||
reply.code(404);
|
||
return 'Invalid API response';
|
||
}
|
||
|
||
const contentPath = getContentPath(apiData.data.uniqid || key);
|
||
if (fs.existsSync(contentPath) && !nocache) {
|
||
if (isValidThumbSpec(apiData.data.thumb)) {
|
||
return generateThumbAndCache(reply, apiData, contentPath).catch(() => { });
|
||
}
|
||
return serveCompletedCache(reply, apiData, contentPath);
|
||
}
|
||
return await downloadAndServe(reply, apiData, contentPath, key);
|
||
} catch (err) {
|
||
request.log.error(err);
|
||
reply.code(502);
|
||
return 'Gateway Error: ' + err.message;
|
||
}
|
||
});
|
||
|
||
// Run
|
||
fastify.listen({ port: PORT, host: '0.0.0.0' }, (err, address) => {
|
||
if (err) {
|
||
console.error(err);
|
||
process.exit(1);
|
||
}
|
||
console.log(`Fastify Server running at ${address}`);
|
||
});
|