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request_overrider.js
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request_overrider.js
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'use strict';
var EventEmitter = require('events').EventEmitter,
http = require('http'),
propagate = require('propagate'),
DelayedBody = require('./delayed_body'),
IncomingMessage = http.IncomingMessage,
ClientRequest = http.ClientRequest,
common = require('./common'),
Socket = require('./socket'),
_ = require('lodash'),
debug = require('debug')('nock.request_overrider'),
timers = require('timers'),
ReadableStream = require('stream').Readable,
globalEmitter = require('./global_emitter'),
zlib = require('zlib');
function getHeader(request, name) {
if (!request._headers) {
return;
}
var key = name.toLowerCase();
return request.getHeader ? request.getHeader(key) : request._headers[key];
}
function setHeader(request, name, value) {
debug('setHeader', name, value);
var key = name.toLowerCase();
request._headers = request._headers || {};
request._headerNames = request._headerNames || {};
request._removedHeader = request._removedHeader || {};
if (request.setHeader) {
request.setHeader(key, value);
} else {
request._headers[key] = value;
request._headerNames[key] = name;
}
if (name == 'expect' && value == '100-continue') {
timers.setImmediate(function() {
debug('continue');
request.emit('continue');
});
}
}
// Sets request headers of the given request. This is needed during both matching phase
// (in case header filters were specified) and mocking phase (to correctly pass mocked
// request headers).
function setRequestHeaders(req, options, interceptor) {
// If a filtered scope is being used we have to use scope's host
// in the header, otherwise 'host' header won't match.
// NOTE: We use lower-case header field names throught Nock.
var HOST_HEADER = 'host';
if(interceptor.__nock_filteredScope && interceptor.__nock_scopeHost) {
if(options && options.headers) {
options.headers[HOST_HEADER] = interceptor.__nock_scopeHost;
}
setHeader(req, HOST_HEADER, interceptor.__nock_scopeHost);
} else {
// For all other cases, we always add host header equal to the
// requested host unless it was already defined.
if (options.host && !getHeader(req, HOST_HEADER)) {
var hostHeader = options.host;
if (options.port === 80 || options.port === 443) {
hostHeader = hostHeader.split(':')[0];
}
setHeader(req, HOST_HEADER, hostHeader);
}
}
}
function RequestOverrider(req, options, interceptors, remove, cb) {
var response;
if (IncomingMessage) {
response = new IncomingMessage(new EventEmitter());
} else {
response = new ReadableStream();
response._read = function() {};
}
var requestBodyBuffers = [],
emitError,
end,
ended,
headers;
// We may be changing the options object and we don't want those
// changes affecting the user so we use a clone of the object.
options = _.clone(options) || {};
response.req = req;
if (options.headers) {
// We use lower-case header field names throught Nock.
options.headers = common.headersFieldNamesToLowerCase(options.headers);
headers = options.headers;
_.forOwn(headers, function(val, key) {
setHeader(req, key, val);
});
}
/// options.auth
if (options.auth && (! options.headers || ! options.headers.authorization)) {
setHeader(req, 'Authorization', 'Basic ' + (new Buffer(options.auth)).toString('base64'));
}
if (! req.connection) {
req.connection = new EventEmitter();
}
req.path = options.path;
options.getHeader = function(name) {
return getHeader(req, name);
};
req.socket = response.socket = Socket({ proto: options.proto });
req.socket.connecting = true;
req.write = function(buffer, encoding, callback) {
debug('write', arguments);
if (!req.aborted) {
if (buffer) {
if (!Buffer.isBuffer(buffer)) {
buffer = new Buffer(buffer, encoding);
}
requestBodyBuffers.push(buffer);
}
if (typeof callback === 'function') {
callback();
}
}
else {
emitError(new Error('Request aborted'));
}
timers.setImmediate(function() {
req.emit('drain');
});
return false;
};
req.end = function(buffer, encoding, callback) {
debug('req.end');
if (!req.aborted && !ended) {
req.write(buffer, encoding, function () {
if (typeof callback === 'function') {
callback();
}
end(cb);
req.emit('finish');
req.emit('end');
});
}
if (req.aborted) {
emitError(new Error('Request aborted'));
}
};
req.flushHeaders = function() {
debug('req.flushHeaders');
if (!req.aborted && !ended) {
end(cb);
}
if (req.aborted) {
emitError(new Error('Request aborted'));
}
};
req.abort = function() {
if (req.aborted) {
return;
}
debug('req.abort');
req.aborted = Date.now();
if (!ended) {
end();
}
var err = new Error();
err.code = 'aborted';
response.emit('close', err);
req.socket.destroy();
req.emit('abort');
var connResetError = new Error('socket hang up');
connResetError.code = 'ECONNRESET';
emitError(connResetError);
};
// restify listens for a 'socket' event to
// be emitted before calling end(), which causes
// nock to hang with restify. The following logic
// fakes the socket behavior for restify,
// Fixes: https://github.com/pgte/nock/issues/79
req.once = req.on = function(event, listener) {
// emit a fake socket.
if (event == 'socket') {
listener.call(req, req.socket);
req.socket.emit('connect', req.socket);
req.socket.emit('secureConnect', req.socket);
}
EventEmitter.prototype.on.call(this, event, listener);
return this;
};
emitError = function(error) {
process.nextTick(function () {
req.emit('error', error);
});
};
end = function(cb) {
debug('ending');
ended = true;
var requestBody,
responseBody,
responseBuffers,
interceptor;
var continued = false;
// When request body is a binary buffer we internally use in its hexadecimal representation.
var requestBodyBuffer = common.mergeChunks(requestBodyBuffers);
var isBinaryRequestBodyBuffer = common.isBinaryBuffer(requestBodyBuffer);
if(isBinaryRequestBodyBuffer) {
requestBody = requestBodyBuffer.toString('hex');
} else {
requestBody = requestBodyBuffer.toString('utf8');
}
/// put back the path into options
/// because bad behaving agents like superagent
/// like to change request.path in mid-flight.
options.path = req.path;
// fixes #976
options.protocol = options.proto + ':';
interceptors.forEach(function(interceptor) {
// For correct matching we need to have correct request headers - if these were specified.
setRequestHeaders(req, options, interceptor);
});
interceptor = _.find(interceptors, function(interceptor) {
return interceptor.match(options, requestBody);
});
if (!interceptor) {
globalEmitter.emit('no match', req, options, requestBody);
// Try to find a hostname match
interceptor = _.find(interceptors, function(interceptor) {
return interceptor.match(options, requestBody, true);
});
if (interceptor && req instanceof ClientRequest) {
if (interceptor.options.allowUnmocked) {
var newReq = new ClientRequest(options, cb);
propagate(newReq, req);
// We send the raw buffer as we received it, not as we interpreted it.
newReq.end(requestBodyBuffer);
return;
}
}
var err = new Error("Nock: No match for request " + common.stringifyRequest(options, requestBody));
err.statusCode = err.status = 404;
emitError(err);
return;
}
debug('interceptor identified, starting mocking');
// We again set request headers, now for our matched interceptor.
setRequestHeaders(req, options, interceptor);
interceptor.req = req;
req.headers = req.getHeaders ? req.getHeaders() : req._headers;
interceptor.scope.emit('request', req, interceptor, requestBody);
if (typeof interceptor.errorMessage !== 'undefined') {
interceptor.interceptionCounter++;
remove(interceptor);
interceptor.discard();
var error;
if (_.isObject(interceptor.errorMessage)) {
error = interceptor.errorMessage;
} else {
error = new Error(interceptor.errorMessage);
}
timers.setTimeout(emitError, interceptor.getTotalDelay(), error);
return;
}
response.statusCode = Number(interceptor.statusCode) || 200;
// Clone headers/rawHeaders to not override them when evaluating later
response.headers = _.extend({}, interceptor.headers);
response.rawHeaders = (interceptor.rawHeaders || []).slice();
debug('response.rawHeaders:', response.rawHeaders);
if (typeof interceptor.body === 'function') {
if (requestBody && common.isJSONContent(req.headers)) {
if (requestBody && common.contentEncoding(req.headers, 'gzip')) {
if (typeof zlib.gunzipSync !== 'function') {
emitError(new Error('Gzip encoding is currently not supported in this version of Node.'));
return;
}
requestBody = String(zlib.gunzipSync(new Buffer(requestBody, 'hex')), 'hex')
} else if (requestBody && common.contentEncoding(req.headers, 'deflate')) {
if (typeof zlib.deflateSync !== 'function') {
emitError(new Error('Deflate encoding is currently not supported in this version of Node.'));
return;
}
requestBody = String(zlib.inflateSync(new Buffer(requestBody, 'hex')), 'hex')
}
requestBody = JSON.parse(requestBody);
}
// In case we are waiting for a callback
if (interceptor.body.length === 3) {
return interceptor.body(options.path, requestBody || '', continueWithResponseBody);
}
responseBody = interceptor.body(options.path, requestBody) || '';
} else {
// If the content is encoded we know that the response body *must* be an array
// of response buffers which should be mocked one by one.
// (otherwise decompressions after the first one fails as unzip expects to receive
// buffer by buffer and not one single merged buffer)
if(common.isContentEncoded(response.headers) && ! common.isStream(interceptor.body)) {
if (interceptor.delayInMs) {
emitError(new Error('Response delay is currently not supported with content-encoded responses.'));
return;
}
var buffers = interceptor.body;
if(!_.isArray(buffers)) {
buffers = [buffers];
}
responseBuffers = _.map(buffers, function(buffer) {
return new Buffer(buffer, 'hex');
});
} else {
responseBody = interceptor.body;
// If the request was binary then we assume that the response will be binary as well.
// In that case we send the response as a Buffer object as that's what the client will expect.
if(isBinaryRequestBodyBuffer && typeof(responseBody) === 'string') {
// Try to create the buffer from the interceptor's body response as hex.
try {
responseBody = new Buffer(responseBody, 'hex');
} catch(err) {
debug('exception during Buffer construction from hex data:', responseBody, '-', err);
}
// Creating buffers does not necessarily throw errors, check for difference in size
if (!responseBody || (interceptor.body.length > 0 && responseBody.length === 0)) {
// We fallback on constructing buffer from utf8 representation of the body.
responseBody = new Buffer(interceptor.body, 'utf8');
}
}
}
}
return continueWithResponseBody(null, responseBody);
function continueWithResponseBody(err, responseBody) {
if (continued) {
return;
}
continued = true;
if (err) {
response.statusCode = 500;
responseBody = err.stack;
}
// Transform the response body if it exists (it may not exist
// if we have `responseBuffers` instead)
if (responseBody) {
debug('transform the response body');
if (Array.isArray(responseBody) &&
responseBody.length >= 2 &&
responseBody.length <= 3 &&
typeof responseBody[0] == 'number')
{
debug('response body is array: %j', responseBody);
response.statusCode = Number(responseBody[0]);
debug('new headers: %j', responseBody[2]);
if (! response.headers) response.headers = {};
_.assign(response.headers, responseBody[2] || {});
debug('response.headers after: %j', response.headers);
responseBody = responseBody[1];
response.rawHeaders = response.rawHeaders || [];
Object.keys(response.headers).forEach(function(key) {
response.rawHeaders.push(key, response.headers[key]);
});
}
if (interceptor.delayInMs) {
debug('delaying the response for', interceptor.delayInMs, 'milliseconds');
// Because setTimeout is called immediately in DelayedBody(), so we
// need count in the delayConnectionInMs.
responseBody = new DelayedBody(interceptor.getTotalDelay(), responseBody);
}
if (common.isStream(responseBody)) {
debug('response body is a stream');
responseBody.pause();
responseBody.on('data', function(d) {
response.push(d);
});
responseBody.on('end', function() {
response.push(null);
});
responseBody.on('error', function(err) {
response.emit('error', err);
});
} else if (responseBody && !Buffer.isBuffer(responseBody)) {
if (typeof responseBody === 'string') {
responseBody = new Buffer(responseBody);
} else {
responseBody = JSON.stringify(responseBody);
response.headers['content-type'] = 'application/json';
}
}
}
interceptor.interceptionCounter++;
remove(interceptor);
interceptor.discard();
if (req.aborted) { return; }
/// response.client.authorized = true
/// fixes https://github.com/pgte/nock/issues/158
response.client = _.extend(response.client || {}, {
authorized: true
});
// Account for updates to Node.js response interface
// cf https://github.com/request/request/pull/1615
response.socket = _.extend(response.socket || {}, {
authorized: true
});
// Evaluate functional headers.
var evaluatedHeaders = {}
Object.keys(response.headers).forEach(function (key) {
var value = response.headers[key];
if (typeof value === "function") {
response.headers[key] = evaluatedHeaders[key] = value(req, response, responseBody);
}
});
for(var rawHeaderIndex = 0 ; rawHeaderIndex < response.rawHeaders.length ; rawHeaderIndex += 2) {
var key = response.rawHeaders[rawHeaderIndex];
var value = response.rawHeaders[rawHeaderIndex + 1];
if (typeof value === "function") {
response.rawHeaders[rawHeaderIndex + 1] = evaluatedHeaders[key.toLowerCase()];
}
}
process.nextTick(respond);
function respond() {
if (req.aborted) { return; }
if (interceptor.socketDelayInMs && interceptor.socketDelayInMs > 0) {
req.socket.applyDelay(interceptor.socketDelayInMs);
}
if (interceptor.delayConnectionInMs && interceptor.delayConnectionInMs > 0) {
req.socket.applyDelay(interceptor.delayConnectionInMs);
setTimeout(_respond, interceptor.delayConnectionInMs);
} else {
_respond();
}
function _respond() {
if (req.aborted) { return; }
debug('emitting response');
if (typeof cb === 'function') {
debug('callback with response');
cb(response);
}
if (req.aborted) {
emitError(new Error('Request aborted'));
}
else {
req.emit('response', response);
}
if (common.isStream(responseBody)) {
debug('resuming response stream');
responseBody.resume();
}
else {
responseBuffers = responseBuffers || [];
if (typeof responseBody !== "undefined") {
debug('adding body to buffer list');
responseBuffers.push(responseBody);
}
// Stream the response chunks one at a time.
timers.setImmediate(function emitChunk() {
var chunk = responseBuffers.shift();
if (chunk) {
debug('emitting response chunk');
response.push(chunk);
timers.setImmediate(emitChunk);
}
else {
debug('ending response stream');
response.push(null);
interceptor.scope.emit('replied', req, interceptor);
}
});
}
}
}
}
};
return req;
}
module.exports = RequestOverrider;