Merge pull request #3754 from maxlajoie99/feature/experimental-proxy-…

…support

Experimental proxy support by manually following redirects

server/Server.js

@@ -6,6 +6,7 @@ const util = require('util')
 const fs = require('./libs/fsExtra')
 const fileUpload = require('./libs/expressFileupload')
 const cookieParser = require('cookie-parser')
+const axios = require('axios')
 
 const { version } = require('../package.json')
 
@@ -54,7 +55,26 @@ class Server {
     global.XAccel = process.env.USE_X_ACCEL
     global.AllowCors = process.env.ALLOW_CORS === '1'
 
-    if (process.env.DISABLE_SSRF_REQUEST_FILTER === '1') {
+    if (process.env.EXP_PROXY_SUPPORT === '1') {
+      // https://github.com/advplyr/audiobookshelf/pull/3754
+      Logger.info(`[Server] Experimental Proxy Support Enabled, SSRF Request Filter was Disabled`)
+      global.DisableSsrfRequestFilter = () => true
+
+      axios.defaults.maxRedirects = 0
+      axios.interceptors.response.use(
+        (response) => response,
+        (error) => {
+          if ([301, 302].includes(error.response?.status)) {
+            return axios({
+              ...error.config,
+              url: error.response.headers.location
+            })
+          }
+
+          return Promise.reject(error)
+        }
+      )
+    } else if (process.env.DISABLE_SSRF_REQUEST_FILTER === '1') {
       Logger.info(`[Server] SSRF Request Filter Disabled`)
       global.DisableSsrfRequestFilter = () => true
     } else if (process.env.SSRF_REQUEST_FILTER_WHITELIST?.length) {