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  1. // ======= GoReplay Middleware helper =============
  2. // Created by Leonid Bugaev in 2017
  3. //
  4. // For questions use GitHub or support@goreplay.org
  5. //
  6. // GoReplay: https://github.com/buger/goreplay
  7. // Middleware package: https://github.com/buger/goreplay/middleware
  8.  
  9. var middleware;
  10.  
  11. function init() {
  12.     var proxy = {
  13.         ch: {},
  14.         on: function(chan, id, cb) {
  15.             if (!cb && id) {
  16.                 cb = id;
  17.             } else if (cb && id) {
  18.                 chan = chan + "#" + id;
  19.             }
  20.  
  21.             if (!proxy.ch[chan]) {
  22.                 proxy.ch[chan] = [];
  23.             }
  24.  
  25.             proxy.ch[chan].push({
  26.                 created: new Date(),
  27.                 cb: cb
  28.             });
  29.  
  30.             return proxy;
  31.         },
  32.  
  33.         emit: function(msg, raw) {
  34.             var chanPrefix;
  35.  
  36.             switch(msg.type) {
  37.                 case "1": chanPrefix = "request"; break;
  38.                 case "2": chanPrefix = "response"; break;
  39.                 case "3": chanPrefix = "replay"; break;
  40.             }
  41.  
  42.             let resp = msg;
  43.  
  44.             ["message", chanPrefix, chanPrefix + "#" + msg.ID].forEach(function(chanID){
  45.                 if (proxy.ch[chanID]) {
  46.                     proxy.ch[chanID].forEach(function(ch){
  47.                         let r = ch.cb(msg);
  48.                         if (r) resp = r; // If one of callback decided not to send response back, do not override it in global callbacks
  49.                     })
  50.                 }
  51.             })
  52.  
  53.             if (resp) {
  54.               process.stdout.write(`${resp.rawMeta.toString('hex')}${Buffer.from("\n").toString("hex")}${resp.http.toString('hex')}\n`)
  55.             }
  56.         }
  57.     }
  58.  
  59.     // Clean up old messaged ID specific channels if they are older then 60s
  60.     setInterval(function(){
  61.         let now = new Date();
  62.         for (k in proxy.ch) {
  63.             if (k.indexOf("#") == -1) continue;
  64.  
  65.             proxy.ch[k] = proxy.ch[k].filter(function(ch){ return (now - ch.created) < (60 * 1000) })
  66.         }
  67.     }, 1000)
  68.  
  69.     const readline = require('readline');
  70.     const rl = readline.createInterface({
  71.           input: process.stdin
  72.     });
  73.  
  74.     rl.on('line', function(line) {
  75.         let msg = parseMessage(line)
  76.         if (msg) {
  77.             proxy.emit(msg, line)
  78.         }
  79.     });
  80.  
  81.     middleware = proxy;
  82.  
  83.     return proxy;
  84. }
  85.  
  86.  
  87. function parseMessage(msg) {
  88.     try {
  89.         let payload = Buffer.from(msg, "hex");
  90.         let metaPos = payload.indexOf("\n");
  91.         let meta = payload.slice(0, metaPos);
  92.         let metaArr = meta.toString("ascii").split(" ");
  93.         let pType = metaArr[0];
  94.         let pID = metaArr[1];
  95.         let raw = payload.slice(metaPos + 1, payload.length);
  96.  
  97.         return {
  98.             type: pType,
  99.             ID: pID,
  100.             rawMeta: meta,
  101.             meta: metaArr,
  102.             http: raw
  103.         }
  104.     } catch(e) {
  105.         fail(`Error while parsing incoming request: ${msg}`)
  106.     }
  107. }
  108.  
  109. // Used to compare values from original and replayed responses
  110. // Accepts request id, regexp pattern for searching the compared value (should include capture group), and callback which returns both original and replayed matched value.
  111. // Example:
  112. //
  113. //   // Compare HTTP headers for response and replayed response, and map values
  114. //   let tokMap = {};
  115. //
  116. //   gor.on("request", function(req) {
  117. //     let tok = gor.httpHeader(req.http, "Auth-Token");
  118. //     if (tok && tokMap[tok]) {
  119. //       req.http = gor.setHttpHeader(req.http, "Auth-Token", tokMap[tok])
  120. //     }
  121. //
  122. //     gor.searchResponses(req.ID, "X-Set-Token: (\w+)$", function(respTok, replTok) {
  123. //       tokMap[respTok] = replTok;
  124. //     })
  125. //
  126. //     return req;
  127. //   })
  128. //
  129. function searchResponses(id, searchPattern, callback) {
  130.     let re = new RegExp(searchPattern);
  131.  
  132.     // Using regexp require converting buffer to string
  133.     // Before converting to string we can use initial `Buffer.indexOf` check
  134.     let indexPattern = searchPattern.split("(")[0];
  135.  
  136.     if (!indexPattern) {
  137.         console.error("Search regexp should include capture group, pointing to the value: `prefix-(.*)`")
  138.         return
  139.     }
  140.  
  141.     middleware.on("response", id, function(resp){
  142.         if (resp.http.indexOf(indexPattern) == -1) {
  143.             callback()
  144.             return resp
  145.         }
  146.  
  147.         let respMatch = resp.http.toString('utf-8').match(re);
  148.         if (!respMatch) {
  149.             callback()
  150.             return resp
  151.         }
  152.  
  153.         middleware.on("replay", id, function(repl) {
  154.             if (repl.http.indexOf(indexPattern) == -1) {
  155.                 callback(respMatch[1]);
  156.                 return repl;
  157.             }
  158.  
  159.             let replMatch = repl.http.toString('utf-8').match(re);
  160.  
  161.             if (!replMatch) {
  162.                 callback(respMatch[1]);
  163.                 return repl;
  164.             }
  165.        
  166.             callback(respMatch[1], replMatch[1]);
  167.            
  168.             return repl;
  169.         })
  170.  
  171.         return resp;
  172.     })
  173. }
  174.  
  175.  
  176. // =========== HTTP parsing =================
  177.  
  178. // Example HTTP payload record (including hidden characters):
  179. //
  180. //  POST / HTTP/1.1\r\n
  181. //  User-Agent: Node\r\n
  182. //  Content-Length: 5\r\n
  183. //  \r\n
  184. //  hello
  185.  
  186. function httpMethod(payload) {
  187.     var pEnd = payload.indexOf(' ');
  188.     return payload.slice(0, pEnd).toString("ascii");
  189. }
  190.  
  191. function httpPath(payload) {
  192.     var pStart = payload.indexOf(' ') + 1;
  193.     var pEnd = payload.indexOf(' ', pStart);
  194.     return payload.slice(pStart, pEnd).toString("ascii");
  195. }
  196.  
  197. function setHttpPath(payload, newPath) {
  198.     var pStart = payload.indexOf(' ') + 1;
  199.     var pEnd = payload.indexOf(' ', pStart);
  200.  
  201.     return Buffer.concat([payload.slice(0, pStart), Buffer.from(newPath), payload.slice(pEnd, payload.length)])
  202. }
  203.  
  204. function httpPathParam(payload, name) {
  205.     let path = httpPath(payload);
  206.     let re = new RegExp(name + "=([^&$]+)");
  207.     let match = path.match(re);
  208.  
  209.     if (match) return decodeURI(match[1]);
  210. }
  211.  
  212. function setHttpPathParam(payload, name, value) {
  213.     let path = httpPath(payload);
  214.     let re = new RegExp(name + "=([^&$]+)");
  215.     let newPath = path.replace(re, name + "=" + encodeURI(value));
  216.    
  217.     // If we should add new param instead
  218.     if (newPath == path) {
  219.         if (newPath.indexOf("?") == -1) {
  220.             newPath += "?"
  221.         } else {
  222.             newPath += "&"
  223.         }
  224.  
  225.         newPath += name + "=" + encodeURI(value);
  226.     }
  227.  
  228.     return setHttpPath(payload, newPath)
  229. }
  230.  
  231. // HTTP response have status code in same position as `path` for requests
  232. function httpStatus(payload) {
  233.     return httpPath(payload);
  234. }
  235.  
  236. function setHttpStatus(payload, newStatus) {
  237.     return setHttpPath(payload, newStatus);
  238. }
  239.  
  240. function httpHeader(payload, name) {
  241.     var currentLine = 0;
  242.     var i = 0;
  243.     var header = { start: -1, end: -1, valueStart: -1 }
  244.     var nameBuf = Buffer.from(name);
  245.     var nameBufLower = Buffer.from(name.toLowerCase());
  246.  
  247.     while(c = payload[i]) {
  248.         if (c == 13) { // new line "\n"
  249.             currentLine++;
  250.             i++
  251.             header.end = i
  252.  
  253.             if (currentLine > 0 && header.start > 0 && header.valueStart > 0) {
  254.                 if (nameBuf.compare(payload, header.start, header.valueStart - 1) == 0 ||
  255.                     nameBufLower.compare(payload, header.start, header.valueStart - 1) == 0) { // ensure that headers are not case sensitive
  256.                     header.value = payload.slice(header.valueStart, header.end - 1).toString("utf-8").trim();
  257.                     header.name = payload.slice(header.start, header.valueStart - 1).toString("utf-8");
  258.                     return header
  259.                 }
  260.             }
  261.  
  262.             header.start = -1
  263.             header.valueStart = -1
  264.             continue;
  265.         } else if (c == 10) { // "\r"
  266.             i++
  267.             continue;
  268.         } else if (c == 58) { // ":" Header/value separator symbol
  269.             if (header.valueStart == -1) {
  270.                 header.valueStart = i + 1;
  271.                 i++
  272.                 continue;
  273.             }
  274.         }
  275.  
  276.         if (header.start == -1) header.start = i;
  277.  
  278.         i++
  279.     }
  280.  
  281.     return
  282. }
  283.  
  284. function setHttpHeader(payload, name, value) {
  285.     let header = httpHeader(payload, name);
  286.     if (!header) {
  287.         let headerStart = payload.indexOf(13) + 1;
  288.         return Buffer.concat([payload.slice(0, headerStart + 1), Buffer.from(name + ": " + value + "\r\n"), payload.slice(headerStart + 1, payload.length)])
  289.     } else {
  290.         return Buffer.concat([payload.slice(0, header.valueStart), Buffer.from(" " + value + "\r\n"), payload.slice(header.end + 1, payload.length)])
  291.     }
  292. }
  293.  
  294. function httpBody(payload) {
  295.     return payload.slice(payload.indexOf("\r\n\r\n") + 4, payload.length);
  296. }
  297.  
  298. function setHttpBody(payload, newBody) {
  299.     let p = setHttpHeader(payload, "Content-Length", newBody.length)
  300.     let headerEnd = p.indexOf("\r\n\r\n") + 4;
  301.     return Buffer.concat([p.slice(0, headerEnd), newBody])
  302. }
  303.  
  304. function httpBodyParam(payload, name) {
  305.     let body = httpBody(payload);
  306.     let re = new RegExp(name + "=([^&$]+)");
  307.     if (body.indexOf(name + "=") != -1) {
  308.         let param = body.toString('utf-8').match(re);
  309.         if (param) {
  310.             return decodeURI(param[1]);
  311.         }
  312.     }
  313. }
  314.  
  315. function setHttpBodyParam(payload, name, value) {
  316.     let body = httpBody(payload);
  317.     let re = new RegExp(name + "=([^&$]+)");
  318.  
  319.     let newBody = body.toString('utf-8');
  320.  
  321.     if (newBody.indexOf(name + "=") != -1 ) {
  322.         newBody = newBody.replace(re, name + "=" + encodeURI(value));
  323.     } else {
  324.         if (newBody.indexOf("=") != -1) {
  325.             newBody += "&";
  326.         }
  327.         newBody += name + "=" + value;
  328.     }
  329.    
  330.     return setHttpBody(payload, Buffer.from(newBody));
  331. }
  332.  
  333. function setHttpCookie(payload, name, value) {
  334.     let h = httpHeader(payload, "Cookie");
  335.     let cookie = h ? h.value : "";
  336.     let cookies = cookie.split("; ").filter(function(v){ return v.indexOf(name + "=") != 0 })
  337.     cookies.push(name + "=" + value)
  338.     return setHttpHeader(payload, "Cookie", cookies.join("; "))
  339. }
  340.  
  341. function httpCookie(payload, name) {
  342.     let h = httpHeader(payload, "Cookie");
  343.     let cookie = h ? h.value : "";
  344.     let value;
  345.     let cookies = cookie.split("; ").forEach(function(v){
  346.         if (v.indexOf(name + "=") == 0) {
  347.             value = v.split("=")[1];
  348.         }
  349.     })
  350.     return value;
  351. }
  352.  
  353. module.exports = {
  354.     init: init,
  355.     on: function(){ return middleware.on.apply(this, arguments) },
  356.     parseMessage: parseMessage,
  357.     searchResponses: searchResponses,
  358.     httpPath: httpPath,
  359.     httpMethod: httpMethod,
  360.     setHttpPath: setHttpPath,
  361.     httpPathParam: httpPathParam,
  362.     setHttpPathParam: setHttpPathParam,
  363.     httpStatus: httpStatus,
  364.     setHttpStatus: setHttpStatus,
  365.     httpHeader: httpHeader,
  366.     setHttpHeader: setHttpHeader,
  367.     httpBody: httpBody,
  368.     setHttpBody: setHttpBody,
  369.     httpBodyParam: httpBodyParam,
  370.     setHttpBodyParam: setHttpBodyParam,
  371.     httpCookie: httpCookie,
  372.     setHttpCookie: setHttpCookie,
  373.     test: testRunner
  374. }
  375.  
  376.  
  377. // =========== Tests ==============
  378.  
  379. function testRunner(){
  380.     ["init", "parseMessage", "httpMethod", "httpPath", "setHttpHeader", "httpPathParam", "httpHeader", "httpBody", "setHttpBody", "httpBodyParam", "httpCookie", "setHttpCookie"].forEach(function(t){
  381.         console.log(`====== Start ${t} =======`)
  382.         eval(`TEST_${t}()`)
  383.         console.log(`====== End ${t} =======`)
  384.     })
  385. }
  386.  
  387. // Just print in red color
  388. function fail(message) {
  389.     console.error("\x1b[31m[MIDDLEWARE] %s\x1b[0m", message)
  390. }
  391.  
  392. function TEST_init() {
  393.     const child_process = require('child_process');
  394.  
  395.     let received = 0;
  396.     let gor = init();
  397.     gor.on("message", function(){
  398.         received++; // should be called 3 times for for every request
  399.     });
  400.  
  401.     gor.on("request", function(){
  402.         received++; // should be called 1 time only for request
  403.     });
  404.  
  405.     gor.on("response", "2", function(){
  406.         received++; // should be called 1 time only for specific response
  407.     })
  408.  
  409.     if (Object.keys(gor.ch).length != 3) {
  410.         return fail("Should create 3 channels");
  411.     }
  412.  
  413.     let req = parseMessage(Buffer.from("1 2 3\nGET / HTTP/1.1\r\n\r\n").toString('hex'));
  414.     let resp = parseMessage(Buffer.from("2 2 3\nHTTP/1.1 200 OK\r\n\r\n").toString('hex'));
  415.     let resp2 = parseMessage(Buffer.from("2 3 3\nHTTP/1.1 200 OK\r\n\r\n").toString('hex'));
  416.     gor.emit(req);
  417.     gor.emit(resp);
  418.     gor.emit(resp2);
  419.  
  420.     child_process.execSync("sleep 0.01");
  421.  
  422.     if (received != 5) {
  423.         fail(`Should receive 5 messages: ${received}`);
  424.     }
  425. }
  426.  
  427. function TEST_parseMessage() {
  428.     const exampleMessage = Buffer.from("1 2 3\nGET / HTTP/1.1\r\n\r\n").toString('hex')
  429.     let msg = parseMessage(exampleMessage)
  430.     let expected = { type: '1', ID: '2', meta: ["1", "2", "3"], http: Buffer.from("GET / HTTP/1.1\r\n\r\n") }
  431.  
  432.     Object.keys(expected).forEach(function(k){
  433.         if (msg[k].toString() != expected[k].toString()) {
  434.             fail(`${k}: '${expected[k]}' != '${msg[k]}'`)
  435.         }
  436.     })
  437. }
  438.  
  439. function TEST_httpPath() {
  440.     const examplePayload = "GET /test HTTP/1.1\r\n\r\n";
  441.  
  442.     let payload = Buffer.from(examplePayload);
  443.     let path = httpPath(payload);
  444.  
  445.     if (path != "/test") {
  446.         return fail(`Path '${patj}' != '/test'`)
  447.     }
  448.  
  449.     let newPayload = setHttpPath(payload, '/')
  450.     if (newPayload.toString() != "GET / HTTP/1.1\r\n\r\n") {
  451.         return fail(`Malformed payload '${newPayload}'`)
  452.     }
  453.  
  454.     newPayload = setHttpPath(payload, '/bigger')
  455.     if (newPayload.toString() != "GET /bigger HTTP/1.1\r\n\r\n") {
  456.         return fail(`Malformed payload '${newPayload}'`)
  457.     }
  458. }
  459.  
  460. function TEST_httpMethod() {
  461.     const examplePayload = "GET /test HTTP/1.1\r\n\r\n";
  462.  
  463.     let payload = Buffer.from(examplePayload);
  464.     let method = httpMethod(payload);
  465.  
  466.     if (method != "GET") {
  467.         return fail(`Path '${method}' != 'GET'`)
  468.     }
  469. }
  470.  
  471.  
  472. function TEST_httpPathParam() {
  473.     let p = Buffer.from("GET / HTTP/1.1\r\n\r\n");
  474.  
  475.     if (httpPathParam(p, "test")) {
  476.         return fail("Should not found param")
  477.     }
  478.  
  479.     p = setHttpPathParam(p, "test", "123");
  480.     if (httpPath(p) != "/?test=123") {
  481.         return fail("Should set first param: " + httpPath(p));
  482.     }
  483.  
  484.     if (httpPathParam(p, "test") != "123") {
  485.         return fail("Should get first param: " + httpPathParam(p, "test"));
  486.     }
  487.  
  488.     p = setHttpPathParam(p, "qwer", "ty");
  489.     if (httpPath(p) != "/?test=123&qwer=ty") {
  490.         return fail("Should set second param: " + httpPath(p));
  491.     }
  492.  
  493.     p = setHttpPathParam(p, "test", "4321");
  494.     if (httpPath(p) != "/?test=4321&qwer=ty") {
  495.         return fail("Should update first param: " + httpPath(p));
  496.     }
  497.  
  498.     if (httpPathParam(p, "test") != "4321") {
  499.         return fail("Should update first param: " + httpPath(p));
  500.     }
  501. }
  502.  
  503. function TEST_httpBodyParam() {
  504.     let p = Buffer.from("POST / HTTP/1.1\r\n\r\n");
  505.  
  506.     if (httpBodyParam(p, "test")) {
  507.         return fail("Should not found param")
  508.     }
  509.  
  510.     p = setHttpBodyParam(p, "test", "123");
  511.     if (httpBody(p).toString() != "test=123") {
  512.         return fail("Should set first param: " + httpBody(p).toString());
  513.     }
  514.  
  515.     if (httpBodyParam(p, "test") != "123") {
  516.         return fail("Should get first param: " + httpBodyParam(p, "test"));
  517.     }
  518.  
  519.     p = setHttpBodyParam(p, "qwer", "ty");
  520.     if (httpBody(p).toString() != "test=123&qwer=ty") {
  521.         return fail("Should set second param: " + httpBody(p).toString());
  522.     }
  523.  
  524.     p = setHttpBodyParam(p, "test", "4321");
  525.     if (httpBody(p).toString() != "test=4321&qwer=ty") {
  526.         return fail("Should update first param: " + httpBody(p).toString());
  527.     }
  528.  
  529.     if (httpBodyParam(p, "test") != "4321") {
  530.         return fail("Should update first param: " + httpBody(p).toString());
  531.     }
  532. }
  533.  
  534. function TEST_httpHeader() {
  535.     const examplePayload = "GET / HTTP/1.1\r\nHost: localhost:3000\r\nUser-Agent: Node\r\nContent-Length:5\r\n\r\nhello";
  536.  
  537.     let expected = {"Host": "localhost:3000", "User-Agent": "Node", "Content-Length": "5"}
  538.  
  539.     Object.keys(expected).forEach(function(name){
  540.         let payload = Buffer.from(examplePayload);
  541.         let header = httpHeader(payload, name);
  542.         if (!header) {
  543.             fail(`Header not found. Was looking for: ${name}`)
  544.         }
  545.         if (header && header.value != expected[name]) {
  546.             fail(`${name}: '${expected[name]}' != '${header.value}'`)
  547.         }
  548.     })
  549. }
  550.  
  551.  
  552. function TEST_setHttpHeader() {
  553.     const examplePayload = "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello";
  554.  
  555.     // Modify existing header
  556.     ["", "1", "Long test header"].forEach(function(ua){
  557.         let expected = `GET / HTTP/1.1\r\nUser-Agent: ${ua}\r\nContent-Length: 5\r\n\r\nhello`;
  558.         let p = Buffer.from(examplePayload);
  559.         p = setHttpHeader(p, "User-Agent", ua);
  560.         if (p != expected) {
  561.             console.error(`setHeader failed, expected User-Agent value: ${ua}.\n${p}`)
  562.         }
  563.     })
  564.  
  565.     // Adding new header
  566.     let expected = `GET / HTTP/1.1\r\nX-Test: test\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello`;
  567.     let p = Buffer.from(examplePayload);
  568.     p = setHttpHeader(p, "X-Test", "test");
  569.     if (p != expected) {
  570.         console.error(`setHeader failed, expected new header 'X-Test' header: ${p}`)
  571.     }
  572. }
  573.  
  574. function TEST_httpBody() {
  575.     const examplePayload = "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello";
  576.     let body = httpBody(Buffer.from(examplePayload));
  577.     if (body != "hello") {
  578.         fail(`'${body}' != 'hello'`)
  579.     }
  580. }
  581.  
  582. function TEST_setHttpBody() {
  583.     const examplePayload = "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello";
  584.     let p = setHttpBody(Buffer.from(examplePayload), Buffer.from("hello, world!"));
  585.  
  586.     if (p != "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 13\r\n\r\nhello, world!") {
  587.         fail(`Wrong body: '${p}'`)
  588.     }
  589. }
  590.  
  591. function TEST_httpCookie() {
  592.     const examplePayload = "GET / HTTP/1.1\r\nCookie: a=b; test=zxc\r\n\r\n";
  593.     let c = httpCookie(Buffer.from(examplePayload), "test");
  594.     if (c != "zxc") {
  595.         return fail(`Should get cookie: ${c}`);
  596.     }
  597.  
  598.     c = httpCookie(Buffer.from(examplePayload), "nope");
  599.     if (c != null) {
  600.         return fail(`Should not find cookie: ${c}`);
  601.     }
  602. }
  603.  
  604. function TEST_setHttpCookie() {
  605.     const examplePayload = "GET / HTTP/1.1\r\nCookie: a=b; test=zxc\r\n\r\n";
  606.     let p = setHttpCookie(Buffer.from(examplePayload), "test", "1");
  607.     if (p != "GET / HTTP/1.1\r\nCookie: a=b; test=1\r\n\r\n") {
  608.         return fail(`Should update cookie: ${p}`)
  609.     }
  610.  
  611.     p = setHttpCookie(Buffer.from(examplePayload), "new", "one");
  612.     if (p != "GET / HTTP/1.1\r\nCookie: a=b; test=zxc; new=one\r\n\r\n") {
  613.         return fail(`Should add new cookie: ${p}`)
  614.     }
  615. }
  616.  
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