refactor: 调整加密请求数据的代码结构；添加一些注释

util/request.js

@@ -85,17 +85,21 @@ const createRequest = (method, uri, data = {}, options) => {
     }
     // console.log(options.cookie, headers['Cookie'])
 
-    let url = ''
-    let encryptData = ''
-    // 目前任意uri都支持三种加密方式
-    if (options.crypto === 'weapi') {
+    let url = '',
+      encryptData = '',
+      crypto = options.crypto
+    // 根据加密方式加密请求数据；目前任意uri都支持四种加密方式
+    switch (crypto) {
+      case 'weapi':
         headers['Referer'] = 'https://music.163.com'
         headers['User-Agent'] = options.ua || chooseUserAgent('pc')
-      let csrfToken = (headers['Cookie'] || '').match(/_csrf=([^(;|$)]+)/)
-      data.csrf_token = csrfToken ? csrfToken[1] : ''
+        let csrfTokenList = (headers['Cookie'] || '').match(/_csrf=([^(;|$)]+)/)
+        data.csrf_token = csrfTokenList ? csrfTokenList[1] : ''
         encryptData = encrypt.weapi(data)
         url = APP_CONF.domain + '/weapi/' + uri.substr(5)
-    } else if (options.crypto === 'linuxapi') {
+        break
+
+      case 'linuxapi':
         headers['User-Agent'] =
           'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36'
         encryptData = encrypt.linuxapi({
@@ -104,11 +108,11 @@ const createRequest = (method, uri, data = {}, options) => {
           params: data,
         })
         url = 'https://music.163.com/api/linux/forward'
-    } else if (
-      options.crypto === 'eapi' ||
-      options.crypto === 'api' ||
-      options.crypto === ''
-    ) {
+        break
+
+      case 'eapi':
+      case 'api':
+      case '':
         // 两种加密方式，都应生成客户端的cookie
         const cookie = options.cookie || {}
         const csrfToken = cookie['__csrf'] || ''
@@ -136,29 +140,36 @@ const createRequest = (method, uri, data = {}, options) => {
           )
           .join('; ')
 
-      let eapiEncrypt = () => {
+        let eapi = () => {
+          // 使用eapi加密
           data.header = header
           encryptData = encrypt.eapi(uri, data)
           url = APP_CONF.apiDomain + '/eapi/' + uri.substr(5)
-        data.e_r = data.e_r != undefined ? data.e_r : APP_CONF.encryptResponse // 用于加密eapi接口的返回值
+          data.e_r = data.e_r != undefined ? data.e_r : APP_CONF.encryptResponse // 用于加密接口返回值
         }
-      if (options.crypto === 'eapi') {
-        eapiEncrypt()
-      } else if (options.crypto === 'api') {
+        let api = () => {
+          // 不使用任何加密
           url = APP_CONF.apiDomain + uri
           encryptData = data
-      } else if (options.crypto === '') {
+        }
+        if (crypto === 'eapi') {
+          eapi()
+        } else if (crypto === 'api') {
+          api()
+        } else if (crypto === '') {
           // 加密方式为空，以配置文件的加密方式为准
           if (APP_CONF.encrypt) {
-          eapiEncrypt()
+            eapi()
           } else {
-          url = APP_CONF.apiDomain + uri
-          encryptData = data
+            api()
           }
         }
-    } else {
+        break
+
+      default:
         // 未知的加密方式
-      console.log('[ERR]', 'Unknown Crypto:', options.crypto)
+        console.log('[ERR]', 'Unknown Crypto:', crypto)
+        break
     }
     const answer = { status: 500, body: {}, cookie: [] }
     // console.log(headers, 'headers')
@@ -216,7 +227,7 @@ const createRequest = (method, uri, data = {}, options) => {
         )
         try {
           if (data.e_r) {
-            // eapi接口返回值被加密
+            // eapi接口返回值被加密，需要解密
             answer.body = encrypt.eapiResDecrypt(
               body.toString('hex').toUpperCase(),
             )