feat(缓存处理): 添加缩略图生成功能并重构缓存服务逻辑

- 在package.json中添加webpack相关依赖并更新sharp版本
- 新增webpack配置用于代码混淆和打包优化
- 实现缩略图生成功能，当API返回thumb参数时自动创建缩略图
- 重构缓存服务逻辑，优化响应头处理和错误处理
- 移除不必要的path模块引入并统一代码风格

source.js

@@ -5,7 +5,6 @@ const querystring = require('querystring');
 const fs = require('fs');
 const pathModule = require('path');
 const crypto = require('crypto');
-const path = require('path');
 const sharp = require('sharp');
 
 const CACHE_DIR_NAME = '.cache';
@@ -24,7 +23,7 @@ const viewsInfo = {
     cacheReadError: 0,
     fetchApiError: 0,
     fetchApiWarning: 0,
-    increment: function(key) {
+    increment: function (key) {
         if (this.hasOwnProperty(key)) {
             this[key]++;
         }
@@ -141,8 +140,8 @@ async function handleApiRedirect(res, apiData) {
 }
 
 async function processSuccessfulApiData(apiData, uniqidhex, reqPath, token, sign, res) {
-    const { url: realUrl, cloudtype, expiration, path: apiPath, headers, uniqid } = apiData.data;
-    const data = { realUrl, cloudtype, expiration: expiration * 1000, path: apiPath, headers, uniqid };
+    const { url: realUrl, cloudtype, expiration, path: apiPath, headers, uniqid, thumb } = apiData.data;
+    const data = { realUrl, cloudtype, expiration: expiration * 1000, path: apiPath, headers, uniqid, thumb };
 
     pathIndex[uniqidhex] = { uniqid: data.uniqid, timestamp: Date.now() };
     const cacheMetaFile = pathModule.join(cacheDir, `${data.uniqid}.meta`);
@@ -160,8 +159,6 @@ async function processSuccessfulApiData(apiData, uniqidhex, reqPath, token, sign
     if (fs.existsSync(cacheContentFile)) {
         const stats = fs.statSync(cacheContentFile);
         const contentLength = stats.size;
-        // If file is very small and content length from API differs, consider re-fetching.
-        // The 2048 threshold seems arbitrary; could be configurable or based on content type.
         if (contentLength < 2048 && data.headers['content-length'] && parseInt(data.headers['content-length'], 10) !== contentLength) {
             console.warn(`Content length mismatch for ${cacheContentFile}. API: ${data.headers['content-length']}, Cache: ${contentLength}. Re-fetching.`);
             fetchAndServe(data, tempCacheContentFile, cacheContentFile, cacheMetaFile, res);
@@ -351,7 +348,7 @@ async function fetchApiData(reqPath, token, sign) {
                         let errorPayload = { code: apiRes.statusCode, message: `API Error: ${apiRes.statusCode}` };
                         try {
                             const parsedError = JSON.parse(responseData);
-                            if(parsedError && parsedError.message) errorPayload.message = parsedError.message;
+                            if (parsedError && parsedError.message) errorPayload.message = parsedError.message;
                         } catch (e) { /* Ignore if response is not JSON */ }
                         resolve(errorPayload); // Resolve with error structure for consistency
                         return;
@@ -379,6 +376,25 @@ async function fetchApiData(reqPath, token, sign) {
     });
 }
 
+// createThumbnail
+function createThumbnail(data, cacheContentFile, thumbCacheFile) {
+    const { path, thumb } = data;
+    const isVideo = path && typeof path === 'string' && path.includes('.mp4');
+    if (isVideo || !thumb) return;
+    if (fs.existsSync(thumbCacheFile)) return;
+    const width = thumb.width;
+    const height = thumb.height;
+    sharp(cacheContentFile)
+        .resize(width, height)
+        .toFile(thumbCacheFile, (err, info) => {
+            if (err) {
+                console.error(`Error creating thumbnail for ${cacheContentFile}:`, err);
+                return;
+            }
+        });
+
+}
+
 
 // 从真实 URL 获取数据并写入缓存
 const REAL_URL_FETCH_TIMEOUT_MS = 0; // 0 means no timeout for the actual file download
@@ -444,6 +460,15 @@ const fetchAndServe = (data, tempCacheContentFile, cacheContentFile, cacheMetaFi
                         }
                         fs.renameSync(tempCacheContentFile, cacheContentFile);
                         console.log(`Successfully cached: ${cacheContentFile}`);
+
+
+                        if (data.thumb) {
+                            const thumbCacheFile = pathModule.join(cacheDir, `${data.uniqid}_thumb.jpg`);
+                            if (!fs.existsSync(thumbCacheFile)) {
+                                // 创建缩略图
+                                createThumbnail(data, cacheContentFile, thumbCacheFile);
+                            }
+                        }
                     } catch (renameError) {
                         console.error(`Error renaming temp cache file ${tempCacheContentFile} to ${cacheContentFile}:`, renameError);
                         // If rename fails, try to remove the temp file to avoid clutter
@@ -477,6 +502,36 @@ function serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res) {
         return;
     }
 
+    const baseHeaders = {
+        'Cloud-Type': cacheData.cloudtype || 'unknown',
+        'Cloud-Expiration': cacheData.expiration || 'N/A',
+        'ETag': cacheData.uniqid || crypto.createHash('md5').update(fs.readFileSync(cacheContentFile)).digest('hex'), // Fallback ETag if missing
+        'Cache-Control': 'public, max-age=31536000', // 1 year
+        'Expires': new Date(Date.now() + 31536000000).toUTCString(),
+        'Accept-Ranges': 'bytes',
+        'Connection': 'keep-alive',
+        'Date': new Date().toUTCString(),
+        'Last-Modified': (cacheData.headers && cacheData.headers['last-modified']) || new Date(fs.statSync(cacheMetaFile).mtime).toUTCString(),
+    };
+    if (cacheData.thumb) {
+        const thumbCacheFile = pathModule.join(cacheDir, `${cacheData.uniqid}_thumb.jpg`);
+        if (fs.existsSync(thumbCacheFile)) {
+            cacheData.headers['content-length'] = fs.statSync(thumbCacheFile).size;
+            const responseHeaders = {
+                ...baseHeaders,
+                ...(cacheData.headers || {}),
+                'ETag': (cacheData.uniqid || '') + '_thumb',
+                'Content-Type': 'image/jpeg',
+            };
+            res.writeHead(HTTP_STATUS.OK, responseHeaders);
+            const thumbStream = fs.createReadStream(thumbCacheFile);
+            thumbStream.pipe(res);
+            return;
+        } else {
+            createThumbnail(cacheData, cacheContentFile, thumbCacheFile)
+        }
+    }
+
     viewsInfo.increment('cacheCall');
     const readStream = fs.createReadStream(cacheContentFile);
     const isVideo = cacheData.path && typeof cacheData.path === 'string' && cacheData.path.includes('.mp4');
@@ -505,17 +560,6 @@ function serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res) {
     }
 
     readStream.on('open', () => {
-        const baseHeaders = {
-            'Cloud-Type': cacheData.cloudtype || 'unknown',
-            'Cloud-Expiration': cacheData.expiration || 'N/A',
-            'ETag': cacheData.uniqid || crypto.createHash('md5').update(fs.readFileSync(cacheContentFile)).digest('hex'), // Fallback ETag if missing
-            'Cache-Control': 'public, max-age=31536000', // 1 year
-            'Expires': new Date(Date.now() + 31536000000).toUTCString(),
-            'Accept-Ranges': 'bytes',
-            'Connection': 'keep-alive',
-            'Date': new Date().toUTCString(),
-            'Last-Modified': (cacheData.headers && cacheData.headers['last-modified']) || new Date(fs.statSync(cacheMetaFile).mtime).toUTCString(),
-        };
 
         const responseHeaders = {
             ...baseHeaders,
@@ -523,7 +567,6 @@ function serveFromCache(cacheData, cacheContentFile, cacheMetaFile, res) {
             // Merge other headers from cacheData.headers, letting them override base if necessary
             // but ensure our critical headers like Content-Length (if updated) are preserved.
             ...(cacheData.headers || {}),
-            'Content-Length': currentContentLength.toString(), // Ensure this is set correctly
         };
 
         res.writeHead(HTTP_STATUS.OK, responseHeaders);