/
intercept.js
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/
intercept.js
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'use strict';
/**
* @module nock/intercepts
*/
var RequestOverrider = require('./request_overrider'),
common = require('./common'),
url = require('url'),
inherits = require('util').inherits,
Interceptor = require('./interceptor'),
http = require('http'),
parse = require('url').parse,
_ = require('lodash'),
debug = require('debug')('nock.intercept'),
timers = require('timers'),
EventEmitter = require('events').EventEmitter,
globalEmitter = require('./global_emitter');
/**
* @name NetConnectNotAllowedError
* @private
* @desc Error trying to make a connection when disabled external access.
* @class
* @example
* nock.disableNetConnect();
* http.get('http://zombo.com');
* // throw NetConnectNotAllowedError
*/
function NetConnectNotAllowedError(host, path) {
Error.call(this);
this.name = 'NetConnectNotAllowedError';
this.message = 'Nock: Not allow net connect for "' + host + path + '"';
Error.captureStackTrace(this, this.constructor);
}
inherits(NetConnectNotAllowedError, Error);
var allInterceptors = {},
allowNetConnect;
/**
* Enabled real request.
* @public
* @param {String|RegExp} matcher=RegExp.new('.*') Expression to match
* @example
* // Enables all real requests
* nock.enableNetConnect();
* @example
* // Enables real requests for url that matches google
* nock.enableNetConnect('google');
* @example
* // Enables real requests for url that matches google and amazon
* nock.enableNetConnect(/(google|amazon)/);
*/
function enableNetConnect(matcher) {
if (_.isString(matcher)) {
allowNetConnect = new RegExp(matcher);
} else if (_.isObject(matcher) && _.isFunction(matcher.test)) {
allowNetConnect = matcher;
} else {
allowNetConnect = /.*/;
}
}
function isEnabledForNetConnect(options) {
common.normalizeRequestOptions(options);
var enabled = allowNetConnect && allowNetConnect.test(options.host);
debug('Net connect', enabled ? '' : 'not', 'enabled for', options.host);
return enabled;
}
/**
* Disable all real requests.
* @public
* @param {String|RegExp} matcher=RegExp.new('.*') Expression to match
* @example
* nock.disableNetConnect();
*/
function disableNetConnect() {
allowNetConnect = undefined;
}
function isOn() {
return !isOff();
}
function isOff() {
return process.env.NOCK_OFF === 'true';
}
function add(key, interceptor, scope, scopeOptions, host) {
if (! allInterceptors.hasOwnProperty(key)) {
allInterceptors[key] = { key: key, scopes: [] };
}
interceptor.__nock_scope = scope;
// We need scope's key and scope options for scope filtering function (if defined)
interceptor.__nock_scopeKey = key;
interceptor.__nock_scopeOptions = scopeOptions;
// We need scope's host for setting correct request headers for filtered scopes.
interceptor.__nock_scopeHost = host;
interceptor.interceptionCounter = 0;
if (scopeOptions.allowUnmocked)
allInterceptors[key].allowUnmocked = true;
allInterceptors[key].scopes.push(interceptor);
}
function remove(interceptor) {
if (interceptor.__nock_scope.shouldPersist() || --interceptor.counter > 0) {
return;
}
var basePath = interceptor.basePath;
var interceptors = allInterceptors[basePath] && allInterceptors[basePath].scopes || [];
interceptors.some(function (thisInterceptor, i) {
return (thisInterceptor === interceptor) ? interceptors.splice(i, 1) : false;
});
}
function removeAll() {
Object.keys(allInterceptors).forEach(function(key) {
allInterceptors[key].scopes.forEach(function(interceptor) {
interceptor.scope.keyedInterceptors = {};
});
});
allInterceptors = {};
}
function interceptorsFor(options) {
var basePath,
matchingInterceptor;
common.normalizeRequestOptions(options);
debug('interceptors for %j', options.host);
basePath = options.proto + '://' + options.host;
debug('filtering interceptors for basepath', basePath);
// First try to use filteringScope if any of the interceptors has it defined.
_.each(allInterceptors, function(interceptor, k) {
_.each(interceptor.scopes, function(scope) {
var filteringScope = scope.__nock_scopeOptions.filteringScope;
// If scope filtering function is defined and returns a truthy value
// then we have to treat this as a match.
if(filteringScope && filteringScope(basePath)) {
debug('found matching scope interceptor');
// Keep the filtered scope (its key) to signal the rest of the module
// that this wasn't an exact but filtered match.
scope.__nock_filteredScope = scope.__nock_scopeKey;
matchingInterceptor = interceptor.scopes;
// Break out of _.each for scopes.
return false;
}
});
if (!matchingInterceptor && common.matchStringOrRegexp(basePath, interceptor.key)) {
if (interceptor.scopes.length === 0 && interceptor.allowUnmocked) {
matchingInterceptor = [
{
options: { allowUnmocked: true },
matchIndependentOfBody: function() { return false }
}
];
} else {
matchingInterceptor = interceptor.scopes;
}
// false to short circuit the .each
return false;
}
// Returning falsy value here (which will happen if we have found our matching interceptor)
// will break out of _.each for all interceptors.
return !matchingInterceptor;
});
return matchingInterceptor;
}
function removeInterceptor(options) {
var baseUrl, key, method, proto;
if (options instanceof Interceptor) {
baseUrl = options.basePath;
key = options._key;
} else {
proto = options.proto ? options.proto : 'http';
common.normalizeRequestOptions(options);
baseUrl = proto + '://' + options.host;
method = options.method && options.method.toUpperCase() || 'GET';
key = method + ' ' + baseUrl + (options.path || '/');
}
if (allInterceptors[baseUrl] && allInterceptors[baseUrl].scopes.length > 0) {
if (key) {
for (var i = 0; i < allInterceptors[baseUrl].scopes.length; i++) {
var interceptor = allInterceptors[baseUrl].scopes[i];
if (interceptor._key === key) {
allInterceptors[baseUrl].scopes.splice(i, 1);
interceptor.scope.remove(key, interceptor);
break;
}
}
} else {
allInterceptors[baseUrl].scopes.length = 0;
}
return true;
}
return false;
}
// Variable where we keep the ClientRequest we have overridden
// (which might or might not be node's original http.ClientRequest)
var originalClientRequest;
function ErroringClientRequest(error) {
if (http.OutgoingMessage) http.OutgoingMessage.call(this);
process.nextTick(function() {
this.emit('error', error);
}.bind(this));
}
if (http.ClientRequest) {
inherits(ErroringClientRequest, http.ClientRequest);
}
function overrideClientRequest() {
debug('Overriding ClientRequest');
if(originalClientRequest) {
throw new Error('Nock already overrode http.ClientRequest');
}
// ----- Extending http.ClientRequest
// Define the overriding client request that nock uses internally.
function OverriddenClientRequest(options, cb) {
if (http.OutgoingMessage) http.OutgoingMessage.call(this);
// Filter the interceptors per request options.
var interceptors = interceptorsFor(options);
if (isOn() && interceptors) {
debug('using', interceptors.length, 'interceptors');
// Use filtered interceptors to intercept requests.
var overrider = RequestOverrider(this, options, interceptors, remove, cb);
for(var propName in overrider) {
if (overrider.hasOwnProperty(propName)) {
this[propName] = overrider[propName];
}
}
} else {
debug('falling back to original ClientRequest');
// Fallback to original ClientRequest if nock is off or the net connection is enabled.
if(isOff() || isEnabledForNetConnect(options)) {
originalClientRequest.apply(this, arguments);
} else {
timers.setImmediate(function () {
var error = new NetConnectNotAllowedError(options.host, options.path);
this.emit('error', error);
}.bind(this));
}
}
}
if (http.ClientRequest) {
inherits(OverriddenClientRequest, http.ClientRequest);
} else {
inherits(OverriddenClientRequest, EventEmitter);
}
// Override the http module's request but keep the original so that we can use it and later restore it.
// NOTE: We only override http.ClientRequest as https module also uses it.
originalClientRequest = http.ClientRequest;
http.ClientRequest = OverriddenClientRequest;
debug('ClientRequest overridden');
}
function restoreOverriddenClientRequest() {
debug('restoring overriden ClientRequest');
// Restore the ClientRequest we have overridden.
if(!originalClientRequest) {
debug('- ClientRequest was not overridden');
} else {
http.ClientRequest = originalClientRequest;
originalClientRequest = undefined;
debug('- ClientRequest restored');
}
}
function isActive() {
// If ClientRequest has been overwritten by Nock then originalClientRequest is not undefined.
// This means that Nock has been activated.
return !_.isUndefined(originalClientRequest);
}
function interceptorScopes() {
return _.reduce(allInterceptors, function(result, interceptors) {
for (var interceptor in interceptors.scopes) {
result = result.concat(interceptors.scopes[interceptor].__nock_scope);
}
return result;
}, []);
}
function isDone() {
return _.every(interceptorScopes(), function(scope) {
return scope.isDone();
});
}
function pendingMocks() {
return _.flatten(_.map(interceptorScopes(), function(scope) {
return scope.pendingMocks();
}));
}
function activeMocks() {
return _.flatten(_.map(interceptorScopes(), function(scope) {
return scope.activeMocks();
}));
}
function activate() {
if(originalClientRequest) {
throw new Error('Nock already active');
}
overrideClientRequest();
// ----- Overriding http.request and https.request:
common.overrideRequests(function(proto, overriddenRequest, options, callback) {
// NOTE: overriddenRequest is already bound to its module.
var req,
res;
if (typeof options === 'string') {
options = parse(options);
}
options.proto = proto;
var interceptors = interceptorsFor(options)
if (isOn() && interceptors) {
var matches = false,
allowUnmocked = false;
matches = !! _.find(interceptors, function(interceptor) {
return interceptor.matchIndependentOfBody(options);
});
allowUnmocked = !! _.find(interceptors, function(interceptor) {
return interceptor.options.allowUnmocked;
});
if (! matches && allowUnmocked) {
if (proto === 'https') {
var ClientRequest = http.ClientRequest;
http.ClientRequest = originalClientRequest;
req = overriddenRequest(options, callback);
http.ClientRequest = ClientRequest;
} else {
req = overriddenRequest(options, callback);
}
globalEmitter.emit('no match', req);
return req;
}
// NOTE: Since we already overrode the http.ClientRequest we are in fact constructing
// our own OverriddenClientRequest.
req = new http.ClientRequest(options);
res = RequestOverrider(req, options, interceptors, remove);
if (callback) {
res.on('response', callback);
}
return req;
} else {
globalEmitter.emit('no match', options);
if (isOff() || isEnabledForNetConnect(options)) {
return overriddenRequest(options, callback);
} else {
var error = new NetConnectNotAllowedError(options.host, options.path);
return new ErroringClientRequest(error);
}
}
});
}
activate();
module.exports = add;
module.exports.removeAll = removeAll;
module.exports.removeInterceptor = removeInterceptor;
module.exports.isOn = isOn;
module.exports.activate = activate;
module.exports.isActive = isActive;
module.exports.isDone = isDone;
module.exports.pendingMocks = pendingMocks;
module.exports.activeMocks = activeMocks;
module.exports.enableNetConnect = enableNetConnect;
module.exports.disableNetConnect = disableNetConnect;
module.exports.overrideClientRequest = overrideClientRequest;
module.exports.restoreOverriddenClientRequest = restoreOverriddenClientRequest;