├── .gitignore ├── .travis.yml ├── LICENSE ├── README.md ├── examples ├── example-stream-replace.js └── example-trumpet.js ├── index.js ├── package-lock.json ├── package.json └── test └── test.js /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | yarn-debug.log* 6 | yarn-error.log* 7 | 8 | # Runtime data 9 | pids 10 | *.pid 11 | *.seed 12 | *.pid.lock 13 | 14 | # Directory for instrumented libs generated by jscoverage/JSCover 15 | lib-cov 16 | 17 | # Coverage directory used by tools like istanbul 18 | coverage 19 | 20 | # nyc test coverage 21 | .nyc_output 22 | 23 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files) 24 | .grunt 25 | 26 | # Bower dependency directory (https://bower.io/) 27 | bower_components 28 | 29 | # node-waf configuration 30 | .lock-wscript 31 | 32 | # Compiled binary addons (https://nodejs.org/api/addons.html) 33 | build/Release 34 | 35 | # Dependency directories 36 | node_modules/ 37 | jspm_packages/ 38 | 39 | # TypeScript v1 declaration files 40 | typings/ 41 | 42 | # Optional npm cache directory 43 | .npm 44 | 45 | # Optional eslint cache 46 | .eslintcache 47 | 48 | # Optional REPL history 49 | .node_repl_history 50 | 51 | # Output of 'npm pack' 52 | *.tgz 53 | 54 | # Yarn Integrity file 55 | .yarn-integrity 56 | 57 | # dotenv environment variables file 58 | .env 59 | 60 | # next.js build output 61 | .next 62 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: node_js 2 | node_js: 3 | - "8" 4 | - "node" 5 | - "lts/*" 6 | notifications: 7 | email: 8 | - github@aram.nubmail.ca 9 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Aram Akhavan 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # http-proxy-interceptor [![Build Status](https://travis-ci.org/kaysond/http-proxy-interceptor.svg?branch=master)](https://travis-ci.org/kaysond/http-proxy-interceptor) 2 | `http-proxy-interceptor` is a middleware for [node-http-proxy](https://github.com/nodejitsu/node-http-proxy) that modifies responses using streams 3 | ## Installation 4 | `npm install http-proxy-interceptor` 5 | 6 | ## Usage 7 | ```javascript 8 | httpProxyInterceptor(interceptorFactory[, filter]) 9 | ``` 10 | `interceptorFactory` is a required `callable` that receives two arguments (`req` and `res`) and should return a [Transform Stream](https://nodejs.org/dist/latest-v10.x/docs/api/stream.html#stream_implementing_a_transform_stream). This stream receives and transforms the http response body. `interceptorFactory` can also return an `Array` of Transform Streams. In this case, the constituent streams will be turned into a pipe chain, with the first array element being first in the chain, etc. 11 | 12 | `filter` is an optional `Object` with one or two properties: 13 | * `url`: a `RegExp` against which ***request*** URL's are tested. Only responses whose request URL matches get intercepted 14 | * `headers`: an `Object` whose keys are header names and values are `RegExp`'s against which the ***response*** headers are tested. Only responses where all of the headers match are intercepted. If any of the specified filter headers do not exist in the response, the match fails. 15 | 16 | If no filter is passed, all responses are intercepted. 17 | 18 | ## Example 19 | ```javascript 20 | const connect = require('connect') 21 | const http = require('http') 22 | const httpProxy = require('http-proxy') 23 | const httpProxyInterceptor = require('http-proxy-interceptor') 24 | 25 | var interceptorFactory = function(req, res) { 26 | //Use different streams depending on the request 27 | if (/\.css$/.test(req.url)) 28 | return new cssModifyingStream() 29 | else 30 | return [new otherModifyingStream(), new otherModifyingStream(withArguments)] 31 | } 32 | 33 | const filter = { 34 | url: /\/\w+/, //Only match non-root requests 35 | headers: { 36 | 'content-type': /text/ //Only match requests that specify text-based content types 37 | } 38 | } 39 | 40 | const port = 8000 41 | const options = { 42 | target: "https://nodejs.org/", 43 | changeOrigin: true, 44 | hostRewrite: `localhost:${port}`, 45 | protocolRewrite: "http", 46 | cookieDomainRewrite: "localhost" 47 | } 48 | 49 | var proxy = httpProxy.createProxyServer(options) 50 | var app = connect() 51 | app.use(httpProxyInterceptor(interceptorFactory, filter)) 52 | app.use(function(req, res) { 53 | proxy.web(req, res) 54 | }) 55 | var server = http.createServer(app).listen(port) 56 | ``` 57 | 58 | Also see [examples](./examples) 59 | 60 | ## Notes 61 | The middleware handles `gzip` and `deflate` compression automatically, based on the `Content-Encoding` header in the response. The http response is passed through a decompression stream before arriving at the intercepting transform stream, and through a compression stream before being sent to the next middleware. 62 | 63 | Because transform streams (and compression) can arbitrarily change the response length, a fixed `Content-Length` header will not work. If one exists, the middleware will remove it. The middleware always uses`Transfer-Encoding: chunked`. 64 | 65 | ### License 66 | 67 | >The MIT License (MIT) 68 | > 69 | >Copyright (c) 2018 Aram Akhavan 70 | > 71 | >Permission is hereby granted, free of charge, to any person obtaining a copy 72 | >of this software and associated documentation files (the "Software"), to deal 73 | >in the Software without restriction, including without limitation the rights 74 | >to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 75 | >copies of the Software, and to permit persons to whom the Software is 76 | >furnished to do so, subject to the following conditions: 77 | > 78 | >The above copyright notice and this permission notice shall be included in 79 | >all copies or substantial portions of the Software. 80 | > 81 | >THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 82 | >IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 83 | >FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 84 | >AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 85 | >LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 86 | >OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 87 | >THE SOFTWARE. 88 | -------------------------------------------------------------------------------- /examples/example-stream-replace.js: -------------------------------------------------------------------------------- 1 | /********************************************************** 2 | Use stream-replace (https://github.com/lxe/stream-replace) 3 | to regexp-replace certain colors with red in css responses 4 | 5 | Visit http://localhost:8000 to see the result 6 | **********************************************************/ 7 | 8 | const connect = require('connect') 9 | const http = require('http') 10 | const httpProxy = require('http-proxy') 11 | const replace = require('stream-replace') 12 | const httpProxyInterceptor = require('../') 13 | 14 | const interceptorFactory = function() { 15 | return replace(/(?:#43853d|#026e00|#333)/g, 'red') 16 | } 17 | 18 | const port = 8000 19 | const options = { 20 | target: "https://nodejs.org/", 21 | changeOrigin: true, 22 | hostRewrite: `localhost:${port}`, 23 | protocolRewrite: "http", 24 | cookieDomainRewrite: "localhost" 25 | } 26 | var proxy = httpProxy.createProxyServer(options) 27 | var app = connect() 28 | app.use(httpProxyInterceptor(interceptorFactory, {headers: {'content-type': /text\/css/}})) 29 | app.use(function(req, res) { 30 | proxy.web(req, res) 31 | }) 32 | http.createServer(app).listen(port) -------------------------------------------------------------------------------- /examples/example-trumpet.js: -------------------------------------------------------------------------------- 1 | /******************************************************* 2 | Use trumpet (https://github.com/substack/node-trumpet) 3 | to select the element in html responses and 4 | append a '; 19 | 20 | const tr = trumpet() 21 | const elem = tr.select('head') 22 | const rs = elem.createReadStream() 23 | const ws = elem.createWriteStream() 24 | rs.pipe(ws, { end: false }) 25 | rs.on('end', function() { 26 | ws.end(out) 27 | }) 28 | 29 | return tr 30 | } 31 | 32 | const port = 8000 33 | const options = { 34 | target: "https://nodejs.org/", 35 | changeOrigin: true, 36 | hostRewrite: `localhost:${port}`, 37 | protocolRewrite: "http", 38 | cookieDomainRewrite: "localhost" 39 | } 40 | var proxy = httpProxy.createProxyServer(options) 41 | var app = connect() 42 | app.use(httpProxyInterceptor(interceptorFactory, {headers: {'content-type': /text\/html/}})) 43 | app.use(function(req, res) { 44 | proxy.web(req, res) 45 | }) 46 | http.createServer(app).listen(port) 47 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | 'use strict' 2 | const zlib = require('zlib') 3 | const stream = require('stream') 4 | 5 | module.exports = function httpProxyInterceptor(interceptorFactory, filter) { 6 | var _interceptorFactory = interceptorFactory 7 | var _filter = filter || { url: /.*/ } 8 | //Make all headers lowercase all the time for easier comparisons 9 | if (_filter.headers) { 10 | var headersLC = {} 11 | for (var header in _filter.headers) { 12 | headersLC[header.toLowerCase()] = _filter.headers[header] 13 | } 14 | _filter.headers = headersLC 15 | } 16 | 17 | function attachInterceptor(req, res, filter, factory) { 18 | //Prepare interception framework 19 | if (typeof res.interceptor === 'undefined') { 20 | res.interceptor = new interceptor(res) 21 | 22 | res.writeHead = function() { 23 | var headers = (arguments.length > 2) ? arguments[2] : arguments[1] //writeHead() supports (statusCode, headers) as well as (statusCode, statusMessage, headers) 24 | res.interceptor.checkHeaders(req, res, headers) 25 | res.interceptor.writeHeadOrig.apply(res, arguments) 26 | } 27 | 28 | res.write = function(data, encoding) { 29 | //In case writeHead() hasn't been called yet 30 | res.interceptor.checkHeaders(req, res) 31 | res.interceptor.write(data, encoding) 32 | } 33 | 34 | res.end = function(data, encoding) { 35 | //In case writeHead() or write() haven't been called yet 36 | res.interceptor.checkHeaders(req, res) 37 | res.interceptor.end(data, encoding) 38 | } 39 | 40 | } 41 | 42 | res.interceptor.add(filter, factory) 43 | } 44 | 45 | return function httpProxyInterceptor(req, res, next) { 46 | if (!_filter.url || _filter.url.test(decodeURI(req.url))) { 47 | attachInterceptor(req, res, _filter.headers, _interceptorFactory) 48 | } 49 | 50 | next() 51 | } 52 | } 53 | 54 | class interceptor { 55 | constructor(res) { 56 | this.filters = new Array() 57 | this.streamFactories = new Array() 58 | this.streams = new Array() 59 | this.decompressor = new stream.PassThrough() 60 | this.compressor = new stream.PassThrough() 61 | this.writeOrig = res.write 62 | this.endOrig = res.end 63 | this.writeHeadOrig = res.writeHead 64 | this.headersChecked = false 65 | } 66 | 67 | add(filter, factory) { 68 | this.filters.push(filter) 69 | this.streamFactories.push(factory) 70 | } 71 | 72 | write(data, encoding) { 73 | this.decompressor.write(data, encoding) 74 | } 75 | 76 | end(data, encoding) { 77 | 78 | this.decompressor.end(data, encoding) 79 | } 80 | 81 | addStreams(idx, req, res) { 82 | var streams = this.streamFactories[idx].call(null, req, res) 83 | if (typeof streams[Symbol.iterator] === 'function') { 84 | for (var stream of streams) { 85 | this.streams.push(stream) 86 | } 87 | } 88 | else { 89 | this.streams.push(streams) 90 | } 91 | } 92 | 93 | checkHeaders(req, res, headers) { 94 | if (!this.headersChecked) { 95 | for (var i = 0; i < this.filters.length; i++) { 96 | //Always add streams where there was no header filter 97 | if (typeof this.filters[i] === 'undefined') { 98 | this.addStreams(i, req, res) 99 | } 100 | else { 101 | var filterMatched = true 102 | for (var headerName in this.filters[i]) { 103 | var reqHeader = res.getHeader(headerName) || (headers ? headers[headerName] : undefined) 104 | if (typeof reqHeader === 'undefined' || !this.filters[i][headerName].test(reqHeader)) { 105 | filterMatched = false 106 | break 107 | } 108 | } 109 | if (filterMatched) { 110 | this.addStreams(i, req, res) 111 | } 112 | } 113 | } 114 | 115 | if (this.streams.length > 0) { 116 | //Remove content length headers since it must be sent chunked 117 | res.removeHeader('content-length') 118 | if (typeof headers === 'object') { 119 | for (var header in headers) { 120 | if (header.toLowerCase() == 'content-length') 121 | delete headers[header] 122 | } 123 | } 124 | 125 | var contentEncoding = res.getHeader('content-encoding') 126 | if (typeof contentEncoding === 'undefined' && typeof headers === 'object') { 127 | for (var header in headers) { 128 | if (header.toLowerCase() == 'content-encoding') 129 | contentEncoding = headers[header] 130 | } 131 | } 132 | 133 | if (typeof contentEncoding !== 'undefined') { 134 | if (/\bgzip\b/.test(contentEncoding)) { //not RFC compliant testing 135 | this.compressor = zlib.createGzip() 136 | this.decompressor = zlib.createGunzip() 137 | } 138 | else if (/\bdeflate\b/.test(contentEncoding)) { 139 | this.compressor = zlib.createDeflate() 140 | this.decompressor = zlib.createInflate() 141 | } 142 | } 143 | 144 | this.decompressor.pipe(this.streams[0]) 145 | for (var i = 1; i < this.streams.length; i++) { 146 | this.streams[i-1].pipe(this.streams[i]) 147 | } 148 | this.streams[this.streams.length-1].pipe(this.compressor) 149 | } 150 | else { 151 | //Write directly to the response if there is no interception 152 | this.decompressor.pipe(this.compressor) 153 | } 154 | 155 | this.compressor.on('data', function(chunk) { 156 | this.writeOrig.call(res, chunk) 157 | }.bind(this)) 158 | 159 | 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"middleware for node-http-proxy to modify responses using streams", 5 | "main": "index.js", 6 | "directories": { 7 | "test": "test" 8 | }, 9 | "scripts": { 10 | "test": "mocha" 11 | }, 12 | "repository": { 13 | "type": "git", 14 | "url": "git+https://github.com/kaysond/http-proxy-interceptor.git" 15 | }, 16 | "keywords": [ 17 | "http", 18 | "https", 19 | "proxy", 20 | "stream", 21 | "response" 22 | ], 23 | "author": "Aram Akhavan ", 24 | "license": "MIT", 25 | "bugs": { 26 | "url": "https://github.com/kaysond/http-proxy-interceptor/issues" 27 | }, 28 | "homepage": "https://github.com/kaysond/http-proxy-interceptor#readme", 29 | "devDependencies": { 30 | "chai": "^4.2.0", 31 | "connect": "^3.7.0", 32 | "express": "^4.17.1", 33 | "http-proxy": "^1.18.0", 34 | "mocha": "^7.1.1", 35 | "stream-replace": "^1.0.0", 36 | "trumpet": "^1.7.2" 37 | }, 38 | "dependencies": {} 39 | } 40 | -------------------------------------------------------------------------------- /test/test.js: -------------------------------------------------------------------------------- 1 | 'use strict' 2 | const expect = require('chai').expect 3 | const connect = require('connect') 4 | const express = require('express') 5 | const httpProxy = require('http-proxy') 6 | const replace = require('stream-replace') 7 | const trumpet = require('trumpet') 8 | const http = require('http') 9 | const url = require('url') 10 | const stream = require('stream') 11 | const zlib = require('zlib') 12 | const httpProxyInterceptor = require('../') 13 | 14 | //From node-http-proxy/test/lib-http-proxy-test.js 15 | var initialPort = 1024, gen = {}; 16 | Object.defineProperty(gen, 'port', { 17 | get: function get() { 18 | return initialPort++; 19 | } 20 | }); 21 | 22 | describe('Filtering', function() { 23 | var intercepted, interceptor, proxyInterceptor 24 | 25 | const port = gen.port 26 | const server = http.createServer(function(req, res) { 27 | proxyInterceptor(req, res, new Function()) 28 | //Allow response headers to be set in the request 29 | const headers = url.parse(req.url, true).query 30 | res.writeHead(200, headers) 31 | res.end('foo') 32 | 33 | }).listen(port) 34 | 35 | beforeEach(function() { 36 | intercepted = false 37 | interceptor = new stream.PassThrough() 38 | interceptor.on('end', () => { 39 | intercepted = true 40 | }) 41 | }) 42 | after(function() { 43 | server.close() 44 | }) 45 | 46 | it('should intercept any request when passed no url or headers', function(done) { 47 | proxyInterceptor = httpProxyInterceptor(function() { return interceptor }) 48 | http.get(`http://localhost:${port}/foo bar123?foo=bar`, function(res) { 49 | res.on('data', new Function()) 50 | res.on('end', function() { 51 | expect(intercepted).to.be.true 52 | done() 53 | }) 54 | }).end() 55 | }) 56 | 57 | describe('By URL', function() { 58 | beforeEach(() => { 59 | proxyInterceptor = httpProxyInterceptor(function() { return interceptor }, {url:/foo\s+bar\d+/}) 60 | }) 61 | 62 | it('should intercept requests with matching URLs', function(done) { 63 | http.get(`http://localhost:${port}/foo bar123`, function(res) { 64 | res.on('data', new Function()) 65 | res.on('end', function() { 66 | expect(intercepted).to.be.true 67 | done() 68 | }) 69 | }).end() 70 | }) 71 | it('should not intercept requests without matching URLs', function(done) { 72 | http.get(`http://localhost:${port}/`, function(res) { 73 | res.on('data', new Function()) 74 | res.on('end', function() { 75 | expect(intercepted).to.be.false 76 | done() 77 | }) 78 | }).end() 79 | }) 80 | }) 81 | describe('By header', function() { 82 | const headers = { 83 | 'content-type': /text\/html/, 84 | 'content-encoding': /^identity$/, 85 | 'foo': /bar/ 86 | } 87 | beforeEach(() => { 88 | proxyInterceptor = httpProxyInterceptor(function() { return interceptor }, {headers: headers}) 89 | }) 90 | 91 | it('should intercept requests with all specified headers matching', function(done) { 92 | http.get(`http://localhost:${port}/foo bar123?content-type=text/html&content-encoding=identity&foo=bar`, function(res) { 93 | res.on('data', new Function()) 94 | res.on('end', function() { 95 | expect(intercepted).to.be.true 96 | done() 97 | }) 98 | }).end() 99 | }) 100 | it('should not intercept requests where one specified header does not match', function(done) { 101 | http.get(`http://localhost:${port}/foo bar123?content-type=text/css&content-encoding=identity&foo=bar`, function(res) { 102 | res.on('data', new Function()) 103 | res.on('end', function() { 104 | expect(intercepted).to.be.false 105 | done() 106 | }) 107 | }).end() 108 | }) 109 | it('should not intercept requests where multiple specified headers do not match', function(done) { 110 | http.get(`http://localhost:${port}/foo bar123?content-type=text/css&content-encoding=identity&foo=foo`, function(res) { 111 | res.on('data', new Function()) 112 | res.on('end', function() { 113 | expect(intercepted).to.be.false 114 | done() 115 | }) 116 | }).end() 117 | }) 118 | it('should not intercept requests where a specified header is undefined', function(done) { 119 | http.get(`http://localhost:${port}/foo bar123?content-type=text/html&content-encoding=identity`, function(res) { 120 | res.on('data', new Function()) 121 | res.on('end', function() { 122 | expect(intercepted).to.be.false 123 | done() 124 | }) 125 | }).end() 126 | }) 127 | }) 128 | }) 129 | 130 | describe('Interception', function() { 131 | it('should actually change the response', function(done) { 132 | const interceptor = new stream.Transform({ 133 | transform(chunk, encoding, callback) { 134 | this.push(Buffer.concat([chunk, new Buffer.from("bar")])) 135 | callback() 136 | } 137 | }) 138 | const proxyInterceptor = httpProxyInterceptor(function() { return interceptor }) 139 | const port = gen.port 140 | const server = http.createServer(function(req, res) { 141 | proxyInterceptor(req, res, new Function()) 142 | res.write('foo') 143 | res.end('foo') 144 | }).listen(port) 145 | http.get(`http://localhost:${port}/`, function(res) { 146 | var body = '' 147 | res.on('data', chunk => { body += chunk.toString() }) 148 | res.on('end', function() { 149 | expect(body).to.equal('foobarfoobar') 150 | server.close() 151 | done() 152 | }) 153 | }).end() 154 | }) 155 | it('should remove content-length headers and use chunked transfer-encoding', function(done) { 156 | const interceptor = new stream.PassThrough() 157 | const proxyInterceptor = httpProxyInterceptor(function() { return interceptor }) 158 | const port = gen.port 159 | const server = http.createServer(function(req, res) { 160 | proxyInterceptor(req, res, new Function()) 161 | res.writeHead(200, {'ContenT-lEnGth': 6}) 162 | res.write('foo') 163 | res.end('bar') 164 | }).listen(port) 165 | http.get(`http://localhost:${port}/`, function(res) { 166 | var body = '' 167 | res.on('data', chunk => { body += chunk.toString() }) 168 | res.on('end', function() { 169 | expect(body).to.equal('foobar') 170 | expect(res.headers['content-length']).to.be.undefined 171 | expect(res.headers['transfer-encoding']).to.equal('chunked') 172 | server.close() 173 | done() 174 | }) 175 | }).end() 176 | }) 177 | it('should not affect headers (except content-length)', function(done) { 178 | const proxyInterceptor = httpProxyInterceptor(function() { return new stream.PassThrough() }) 179 | const port = gen.port 180 | const server = http.createServer(function(req, res) { 181 | proxyInterceptor(req, res, new Function()) 182 | res.writeHead(200, { 183 | foo: 'bar', 184 | bar: 'foo' 185 | }) 186 | res.write('foo') 187 | res.end('foo') 188 | }).listen(port) 189 | http.get(`http://localhost:${port}/`, function(res) { 190 | expect(res.headers.foo).to.equal('bar') 191 | expect(res.headers.bar).to.equal('foo') 192 | expect(res.headers['content-length']).to.be.undefined 193 | var body = '' 194 | res.on('data', chunk => { body += chunk.toString() }) 195 | res.on('end', function() { 196 | expect(body).to.equal('foofoo') 197 | server.close() 198 | done() 199 | }) 200 | }).end() 201 | }) 202 | 203 | //This test may not actually send the requests fast enough to cause any problems 204 | it('should handle multiple simultaneous requests', function(done) { 205 | const proxyInterceptor = httpProxyInterceptor(function() { return new stream.PassThrough() }) 206 | const port = gen.port 207 | const server = http.createServer(function(req, res) { 208 | proxyInterceptor(req, res, new Function()) 209 | res.writeHead(200, {'ContenT-lEnGth': 6}) 210 | res.write('foo') 211 | res.end('bar') 212 | }).listen(port) 213 | 214 | function httpGetPromise(resolve, reject) { 215 | http.get(`http://localhost:${port}/`, function(res) { 216 | var body = '' 217 | res.on('data', chunk => { body += chunk.toString() }) 218 | res.on('end', function() { 219 | expect(body).to.equal('foobar') 220 | resolve(true) 221 | }) 222 | }).end() 223 | } 224 | 225 | Promise.all([new Promise(httpGetPromise), new Promise(httpGetPromise), new Promise(httpGetPromise)]).then(values => { 226 | expect(values).to.deep.equal([true, true, true]) 227 | server.close() 228 | done() 229 | }) 230 | }) 231 | it('should properly chain multiple interceptor streams', function (done) { 232 | const interceptor1 = new stream.Transform({ 233 | transform(chunk, encoding, callback) { 234 | this.push(Buffer.concat([chunk, new Buffer.from("bar")])) 235 | callback() 236 | } 237 | }) 238 | const interceptor2 = new stream.Transform({ 239 | transform(chunk, encoding, callback) { 240 | this.push(Buffer.concat([chunk, new Buffer.from("baz")])) 241 | callback() 242 | } 243 | }) 244 | const proxyInterceptor = httpProxyInterceptor(function() { return [interceptor1, interceptor2] }) 245 | const port = gen.port 246 | const server = http.createServer(function(req, res) { 247 | proxyInterceptor(req, res, new Function()) 248 | res.write('foo') 249 | res.end('foo') 250 | }).listen(port) 251 | http.get(`http://localhost:${port}/`, function(res) { 252 | var body = '' 253 | res.on('data', chunk => { body += chunk.toString() }) 254 | res.on('end', function() { 255 | expect(body).to.equal('foobarbazfoobarbaz') 256 | server.close() 257 | done() 258 | }) 259 | }).end() 260 | }) 261 | }) 262 | 263 | describe('Compression', function() { 264 | var proxyInterceptor, interceptor, encoding 265 | var compressor 266 | const port = gen.port 267 | const server = http.createServer(function(req, res) { 268 | proxyInterceptor(req, res, new Function()) 269 | res.writeHead(200, {'ConteNt-encoDing': encoding}) //mixed case to test lowercasing 270 | compressor.pipe(res) 271 | compressor.write('foo') 272 | compressor.end('bar') 273 | }).listen(port) 274 | 275 | after(() => { 276 | server.close() 277 | }) 278 | 279 | describe('gzip', function() { 280 | before(() => { 281 | encoding = 'gzip' 282 | }) 283 | beforeEach(() => { 284 | compressor = zlib.createGzip() 285 | }) 286 | it('should properly decode the response and stream it to the interceptor', function(done) { 287 | interceptor = new stream.PassThrough() 288 | var body = '' 289 | interceptor.on('data', chunk => { body += chunk.toString() }) 290 | interceptor.on('end', function() { 291 | expect(body).to.equal('foobar') 292 | }) 293 | proxyInterceptor = httpProxyInterceptor(function() { return interceptor }) 294 | http.get(`http://localhost:${port}/`, function(res) { 295 | res.on('data', new Function()) 296 | res.on('end', done) 297 | }).end() 298 | }) 299 | it('should properly encode the output of the interceptor', function(done) { 300 | interceptor = new stream.Transform({ 301 | transform(chunk, encoding, callback) { 302 | this.push(Buffer.concat([chunk, new Buffer.from("bar")])) 303 | callback() 304 | } 305 | }) 306 | proxyInterceptor = httpProxyInterceptor(function() { return interceptor }) 307 | http.get(`http://localhost:${port}/`, function(res) { 308 | expect(res.headers['content-encoding']).to.equal('gzip') 309 | const decompressor = zlib.createGunzip() 310 | res.pipe(decompressor) 311 | var body = '' 312 | decompressor.on('data', chunk => { body += chunk.toString() }) 313 | decompressor.on('end', function() { 314 | expect(body).to.equal('foobarbar') //gzip lumps the write('foo') and end('bar') into one chunk 315 | done() 316 | }) 317 | }).end() 318 | }) 319 | }) 320 | describe('deflate', function() { 321 | before(() => { 322 | encoding = 'deflate' 323 | }) 324 | beforeEach(() => { 325 | compressor = zlib.createDeflate() 326 | }) 327 | it('should properly decode the response and stream it to the interceptor', function(done) { 328 | interceptor = new stream.PassThrough() 329 | var body = '' 330 | interceptor.on('data', chunk => { body += chunk.toString() }) 331 | interceptor.on('end', function() { 332 | expect(body).to.equal('foobar') 333 | }) 334 | proxyInterceptor = httpProxyInterceptor(function() { return interceptor }) 335 | http.get(`http://localhost:${port}/`, function(res) { 336 | res.on('data', new Function()) 337 | res.on('end', done) 338 | }).end() 339 | }) 340 | it('should properly encode the output of the interceptor', function(done) { 341 | interceptor = new stream.Transform({ 342 | transform(chunk, encoding, callback) { 343 | this.push(Buffer.concat([chunk, new Buffer.from("bar")])) 344 | callback() 345 | } 346 | }) 347 | proxyInterceptor = httpProxyInterceptor(function() { return interceptor }) 348 | http.get(`http://localhost:${port}/`, function(res) { 349 | expect(res.headers['content-encoding']).to.equal('deflate') 350 | const decompressor = zlib.createInflate() 351 | res.pipe(decompressor) 352 | var body = '' 353 | decompressor.on('data', chunk => { body += chunk.toString() }) 354 | decompressor.on('end', function() { 355 | expect(body).to.equal('foobarbar') //gzip lumps the write('foo') and end('bar') into one chunk 356 | done() 357 | }) 358 | }).end() 359 | }) 360 | }) 361 | }) 362 | 363 | describe('Middleware', function() { 364 | const remotePort = gen.port 365 | const remoteServer = http.createServer(function(req, res) { 366 | res.writeHead(200) 367 | res.end('foo bar') 368 | }).listen(remotePort) 369 | 370 | var intercepted, intercepted2 371 | beforeEach(() => { 372 | intercepted = false 373 | intercepted2 = false 374 | }) 375 | 376 | var interceptorFactory = function() { 377 | var interceptor = new stream.PassThrough() 378 | interceptor.on('end', function() { 379 | intercepted = true 380 | }) 381 | return interceptor 382 | } 383 | 384 | var interceptorFactory2 = function() { 385 | var interceptor = new stream.PassThrough() 386 | interceptor.on('end', function() { 387 | intercepted2 = true 388 | }) 389 | return interceptor 390 | } 391 | 392 | after(() => { 393 | remoteServer.close() 394 | }) 395 | 396 | describe('connect', function() { 397 | it('should properly intercept and pass responses', function(done) { 398 | const proxy = httpProxy.createProxyServer({target: `http://localhost:${remotePort}/`}) 399 | const app = connect() 400 | app.use(httpProxyInterceptor(interceptorFactory)) 401 | app.use(function(req, res) { 402 | proxy.web(req, res) 403 | }) 404 | const localPort = gen.port 405 | const localServer = http.createServer(app).listen(localPort) 406 | 407 | http.get(`http://localhost:${localPort}/`, function(res) { 408 | var body = '' 409 | res.on('data', chunk => { body += chunk.toString() }) 410 | res.on('end', function() { 411 | expect(intercepted).to.be.true 412 | expect(body).to.equal('foo bar') 413 | localServer.close() 414 | done() 415 | }) 416 | }).end() 417 | }) 418 | it('should support using multiple instantiations', function(done) { 419 | const proxy = httpProxy.createProxyServer({target: `http://localhost:${remotePort}/`}) 420 | const app = connect() 421 | app.use(httpProxyInterceptor(interceptorFactory)) 422 | app.use(httpProxyInterceptor(interceptorFactory2)) 423 | app.use(function(req, res) { 424 | proxy.web(req, res) 425 | }) 426 | const localPort = gen.port 427 | const localServer = http.createServer(app).listen(localPort) 428 | 429 | http.get(`http://localhost:${localPort}/`, function(res) { 430 | var body = '' 431 | res.on('data', chunk => { body += chunk.toString() }) 432 | res.on('end', function() { 433 | expect(intercepted).to.be.true 434 | expect(intercepted2).to.be.true 435 | expect(body).to.equal('foo bar') 436 | localServer.close() 437 | done() 438 | }) 439 | }).end() 440 | }) 441 | }) 442 | describe('express', function() { 443 | it('should properly intercept and pass responses', function(done) { 444 | const proxy = httpProxy.createProxyServer({target: `http://localhost:${remotePort}/`}) 445 | const app = express() 446 | app.use(httpProxyInterceptor(interceptorFactory)) 447 | app.use(function(req, res) { 448 | proxy.web(req, res) 449 | }) 450 | const localPort = gen.port 451 | const localServer = app.listen(localPort) 452 | 453 | http.get(`http://localhost:${localPort}/`, function(res) { 454 | var body = '' 455 | res.on('data', chunk => { body += chunk.toString() }) 456 | res.on('end', function() { 457 | expect(intercepted).to.be.true 458 | expect(body).to.equal('foo bar') 459 | localServer.close() 460 | done() 461 | }) 462 | }).end() 463 | }) 464 | it('should support using multiple instantiations', function(done) { 465 | const proxy = httpProxy.createProxyServer({target: `http://localhost:${remotePort}/`}) 466 | const app = express() 467 | app.use(httpProxyInterceptor(interceptorFactory)) 468 | app.use(httpProxyInterceptor(interceptorFactory2)) 469 | app.use(function(req, res) { 470 | proxy.web(req, res) 471 | }) 472 | const localPort = gen.port 473 | const localServer = app.listen(localPort) 474 | 475 | http.get(`http://localhost:${localPort}/`, function(res) { 476 | var body = '' 477 | res.on('data', chunk => { body += chunk.toString() }) 478 | res.on('end', function() { 479 | expect(intercepted).to.be.true 480 | expect(intercepted2).to.be.true 481 | expect(body).to.equal('foo bar') 482 | localServer.close() 483 | done() 484 | }) 485 | }).end() 486 | }) 487 | }) 488 | }) 489 | 490 | describe('Streams', function() { 491 | var proxyInterceptor 492 | const port = gen.port 493 | const server = http.createServer(function(req, res) { 494 | proxyInterceptor(req, res, new Function()) 495 | res.writeHead(200, {'content-type': 'text/html'}) 496 | res.end('foo
bar
') 497 | }).listen(port) 498 | 499 | after(() => { 500 | server.close() 501 | }) 502 | 503 | describe('stream-replace', function() { 504 | it('should properly modify responses', function(done) { 505 | proxyInterceptor = httpProxyInterceptor(function() { return replace(/div/g, 'span') }) 506 | 507 | http.get(`http://localhost:${port}/`, function(res) { 508 | var body = '' 509 | res.on('data', chunk => { body += chunk.toString() }) 510 | res.on('end', function() { 511 | expect(body).to.equal('foobar') 512 | done() 513 | }) 514 | }).end() 515 | }) 516 | }) 517 | describe('trumpet', function() { 518 | it('should properly modify responses', function(done) { 519 | proxyInterceptor = httpProxyInterceptor(function() { 520 | var tr = trumpet() 521 | var ws = tr.select('div').createWriteStream() 522 | ws.end('bar') 523 | return tr 524 | }) 525 | 526 | http.get(`http://localhost:${port}/`, function(res) { 527 | var body = '' 528 | res.on('data', chunk => { body += chunk.toString() }) 529 | res.on('end', function() { 530 | expect(body).to.equal('foo
bar
') 531 | done() 532 | }) 533 | }).end() 534 | }) 535 | }) 536 | }) --------------------------------------------------------------------------------