perf: 正则变为常量，可提交预编译，避免每次都创建

Author: wangliang181230

packages/mitmproxy/src/lib/interceptor/impl/req/requestReplace.js

@@ -1,5 +1,8 @@
 const REMOVE = '[remove]'
 
+const DS_DOWNLOAD_CHECK_RE = /DS_DOWNLOAD/i
+const DS_DOWNLOAD_STRIP_RE = /[?&/]?DS_DOWNLOAD(=[^?&/]+)?$/i
+
 function replaceRequestHeaders (rOptions, headers, log) {
   for (const key in headers) {
     let value = headers[key]
@@ -37,9 +40,9 @@ module.exports = {
 
     // 替换下载文件请求的请求地址（此功能主要是为了方便拦截配置）
     // 注：要转换为下载请求，需要 responseReplace 拦截器的配合使用。
-    if (requestReplaceConfig.doDownload && rOptions.path.match(/DS_DOWNLOAD/i)) {
+    if (requestReplaceConfig.doDownload && DS_DOWNLOAD_CHECK_RE.test(rOptions.path)) {
       rOptions.doDownload = true
-      rOptions.path = rOptions.path.replace(/[?&/]?DS_DOWNLOAD(=[^?&/]+)?$/gi, '')
+      rOptions.path = rOptions.path.replace(DS_DOWNLOAD_STRIP_RE, '')
       actions += `${actions ? ',' : ''}path:remove-DS_DOWNLOAD`
     }
 

packages/mitmproxy/src/lib/interceptor/impl/res/responseReplace.js

@@ -3,6 +3,8 @@ const cacheReq = require('../req/cacheRequest')
 
 const REMOVE = '[remove]'
 
+const FILENAME_RE = /^.*\/([^/?]+)\/?(\?.*)?$/
+
 // 替换响应头
 function replaceResponseHeaders (newHeaders, res, proxyRes) {
   if (!newHeaders || lodash.isEmpty(newHeaders)) {
@@ -82,7 +84,7 @@ module.exports = {
 
     // 处理文件下载请求
     if (responseReplaceConfig.doDownload || rOptions.doDownload) {
-      const filename = (rOptions.path.match('^.*/([^/?]+)/?(\\?.*)?$') || [])[1] || 'UNKNOWN_FILENAME'
+      const filename = (FILENAME_RE.exec(rOptions.path) || [])[1] || 'UNKNOWN_FILENAME'
       // 设置文件下载响应头
       replaceHeaders['content-disposition'] = `attachment; filename="${encodeURIComponent(filename)}"`
       // 设置文件类型

packages/mitmproxy/src/lib/proxy/middleware/InsertScriptMiddleware.js

@@ -2,6 +2,9 @@ const zlib = require('node:zlib')
 const through = require('through2')
 const log = require('../../../utils/util.log.server')
 
+const HTML_CONTENT_TYPE_RE = /text\/html|application\/xhtml\+xml/
+const CSP_SCRIPT_SRC_RE = /script-src ([^:]*);/i
+
 // 编解码器
 const codecMap = {
   gzip: {
@@ -40,7 +43,7 @@ const httpUtil = {
   // 是否HTML代码
   isHtml (res) {
     const contentType = res.headers['content-type']
-    return (typeof contentType !== 'undefined') && /text\/html|application\/xhtml\+xml/.test(contentType)
+    return (typeof contentType !== 'undefined') && HTML_CONTENT_TYPE_RE.test(contentType)
   },
 }
 const HEAD = Buffer.from('</head>')
@@ -97,8 +100,7 @@ function handleResponseHeaders (res, proxyRes) {
       if (key === 'content-security-policy') {
         // content-security-policy
         let policy = proxyRes.headers[key]
-        const reg = /script-src ([^:]*);/i
-        const matched = policy.match(reg)
+        const matched = policy.match(CSP_SCRIPT_SRC_RE)
         if (matched) {
           if (!matched[1].includes('self')) {
             policy = policy.replace('script-src', 'script-src \'self\' ')
@@ -143,7 +145,7 @@ module.exports = {
       'Cache-Control': 'public, max-age=86401, immutable', // 缓存1天
       'Last-Modified': now.toUTCString(),
       'Expires': new Date(now.getTime() + 86400000).toUTCString(), // 缓存1天
-      'Date': new Date().toUTCString(),
+      'Date': now.toUTCString(),
     })
     res.write(script.script)
     res.end()

packages/mitmproxy/src/lib/proxy/mitmproxy/createRequestHandler.js

@@ -11,6 +11,7 @@ const InsertScriptMiddleware = require('../middleware/InsertScriptMiddleware')
 const dnsLookup = require('./dnsLookup')
 
 const MAX_SLOW_TIME = 8000 // 超过此时间 则认为太慢了
+const WWW_AUTH_HEADER_RE = /^www-authenticate$/i
 
 // create requestHandler function
 module.exports = function createRequestHandler (createIntercepts, middlewares, externalProxy, dnsConfig, setting, compatibleConfig) {
@@ -313,7 +314,7 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
         Object.keys(proxyRes.headers).forEach((key) => {
           if (proxyRes.headers[key] !== undefined) {
             // https://github.com/nodejitsu/node-http-proxy/issues/362
-            if (/^www-authenticate$/i.test(key)) {
+            if (WWW_AUTH_HEADER_RE.test(key)) {
               if (proxyRes.headers[key]) {
                 proxyRes.headers[key] = proxyRes.headers[key] && proxyRes.headers[key].split(',')
               }