Merge pull request #741 from samccone/sjs/redirect-host-rewrite

Allow optional redirect host rewriting.

README.md

@@ -325,6 +325,7 @@ proxyServer.listen(8015);
  *  **secure**: true/false, if you want to verify the SSL Certs
  *  **xfwd**: true/false, adds x-forward headers
  *  **toProxy**: passes the absolute URL as the `path` (useful for proxying to proxies)
+ *  **hostRewrite**: rewrites the location hostname on (301/302/307/308) redirects.
 
 If you are using the `proxyServer.listen` method, the following options are also applicable:
 

lib/http-proxy.js

@@ -41,6 +41,7 @@ module.exports.createProxyServer =
    *    prependPath: <true/false, Default: true - specify whether you want to prepend the target's path to the proxy path>
    *    localAddress : <Local interface string to bind for outgoing connections>
    *    changeOrigin: <true/false, Default: false - changes the origin of the host header to the target URL>
+   *    hostRewrite: rewrites the location hostname on (301/302/307/308) redirects, Default: null.
    *  }
    *
    *  NOTE: `options.ws` and `options.ssl` are optional.

lib/http-proxy/passes/web-incoming.js

@@ -145,7 +145,7 @@ web_o = Object.keys(web_o).map(function(pass) {
     proxyReq.on('response', function(proxyRes) {
       if(server) { server.emit('proxyRes', proxyRes, req, res); }
       for(var i=0; i < web_o.length; i++) {
-       if(web_o[i](req, res, proxyRes)) { break; }
+       if(web_o[i](req, res, proxyRes, options)) { break; }
       }
 
       // Allow us to listen when the proxy has completed

lib/http-proxy/passes/web-outgoing.js

@@ -1,5 +1,6 @@
-var passes = exports;
-
+var url           = require('url')
+var passes        = exports;
+var redirectRegex = /^30(1|2|7|8)$/;
 /*!
  * Array of passes.
  *
@@ -43,6 +44,13 @@ var passes = exports;
     }
   },
 
+  function setRedirectHostRewrite(req, res, proxyRes, options) {
+    if (options.hostRewrite && redirectRegex.test(proxyRes.statusCode)) {
+      var u = url.parse(proxyRes.headers['location']);
+      u.host = options.hostRewrite;
+      proxyRes.headers['location'] = u.format();
+    }
+  },
   /**
    * Copy headers from proxyResponse to response
    * set each header in response object.

test/lib-http-proxy-passes-web-outgoing-test.js

@@ -2,6 +2,58 @@ var httpProxy = require('../lib/http-proxy/passes/web-outgoing'),
     expect = require('expect.js');
 
 describe('lib/http-proxy/passes/web-outgoing.js', function () {
+  describe('#setRedirectHostRewrite', function () {
+    context('rewrites location host to option', function() {
+      beforeEach(function() {
+        this.proxyRes = {
+          statusCode: 301,
+          headers: {
+            location: "http://f.com/"
+          }
+        };
+
+        this.options = {
+          hostRewrite: "x.com"
+        };
+      });
+
+      it('on 301', function() {
+        this.proxyRes.statusCode = 301;
+        httpProxy.setRedirectHostRewrite({}, {}, this.proxyRes, this.options);
+        expect(this.proxyRes.headers.location).to.eql('http://'+this.options.hostRewrite+'/');
+      });
+
+      it('on 302', function() {
+        this.proxyRes.statusCode = 302;
+        httpProxy.setRedirectHostRewrite({}, {}, this.proxyRes, this.options);
+        expect(this.proxyRes.headers.location).to.eql('http://'+this.options.hostRewrite+'/');
+      });
+
+      it('on 307', function() {
+        this.proxyRes.statusCode = 307;
+        httpProxy.setRedirectHostRewrite({}, {}, this.proxyRes, this.options);
+        expect(this.proxyRes.headers.location).to.eql('http://'+this.options.hostRewrite+'/');
+      });
+
+      it('on 308', function() {
+        this.proxyRes.statusCode = 308;
+        httpProxy.setRedirectHostRewrite({}, {}, this.proxyRes, this.options);
+        expect(this.proxyRes.headers.location).to.eql('http://'+this.options.hostRewrite+'/');
+      });
+
+      it('not on 200', function() {
+        this.proxyRes.statusCode = 200;
+        httpProxy.setRedirectHostRewrite({}, {}, this.proxyRes, this.options);
+        expect(this.proxyRes.headers.location).to.eql('http://f.com/');
+      });
+
+      it('not when hostRewrite is unset', function() {
+        httpProxy.setRedirectHostRewrite({}, {}, this.proxyRes, {});
+        expect(this.proxyRes.headers.location).to.eql('http://f.com/');
+      });
+    });
+  });
+
   describe('#setConnection', function () {
     it('set the right connection with 1.0 - `close`', function() {
       var proxyRes = { headers: {} };