Library for intercepting AJAX communications

Browserify'd version of ajax-interceptor

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/11365/65323/Library%20for%20intercepting%20AJAX%20communications.js

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// ==UserScript==
// @name Library for intercepting AJAX communications
// @version 1.0
// @author slorber (sauce: https://github.com/slorber/ajax-interceptor)
// @description Browserify'd version of ajax-interceptor
// @namespace MrHat.Torn
// ==/UserScript==


require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"ajax-intercept":[function(require,module,exports){
'use strict';

var COMPLETED_READY_STATE = 4;

var RealXHRSend = XMLHttpRequest.prototype.send;

var requestCallbacks = [];
var responseCallbacks = [];


var wired = false;


function arrayRemove(array,item) {
    var index = array.indexOf(item);
    if (index > -1) {
        array.splice(index, 1);
    } else {
        throw new Error("Could not remove " + item + " from array");
    }
}


function fireCallbacks(callbacks,xhr) {
    for( var i = 0; i < callbacks.length; i++ ) {
        callbacks[i](xhr);
    }
}


exports.addRequestCallback = function(callback) {
    requestCallbacks.push(callback);
};
exports.removeRequestCallback = function(callback) {
    arrayRemove(requestCallbacks,callback);
};


exports.addResponseCallback = function(callback) {
    responseCallbacks.push(callback);
};
exports.removeResponseCallback = function(callback) {
    arrayRemove(responseCallbacks,callback);
};



function fireResponseCallbacksIfCompleted(xhr) {
    if( xhr.readyState === COMPLETED_READY_STATE ) {
        fireCallbacks(responseCallbacks,xhr);
    }
}

function proxifyOnReadyStateChange(xhr) {
    var realOnReadyStateChange = xhr.onreadystatechange;
    if ( realOnReadyStateChange ) {
        xhr.onreadystatechange = function() {
            fireResponseCallbacksIfCompleted(xhr);
            realOnReadyStateChange();
        };
    }
}

exports.wire = function() {
    if ( wired ) throw new Error("Ajax interceptor already wired");

    // Override send method of all XHR requests
    XMLHttpRequest.prototype.send = function() {

        // Fire request callbacks before sending the request
        fireCallbacks(requestCallbacks,this);

        // Wire response callbacks
        if( this.addEventListener ) {
            var self = this;
            this.addEventListener("readystatechange", function() {
                fireResponseCallbacksIfCompleted(self);
            }, false);
        }
        else {
            proxifyOnReadyStateChange(this);
        }

        RealXHRSend.apply(this, arguments);
    };
    wired = true;
};


exports.unwire = function() {
    if ( !wired ) throw new Error("Ajax interceptor not currently wired");
    XMLHttpRequest.prototype.send = RealXHRSend;
    wired = false;
};
},{}]},{},[]);