15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Sample extension to replace all JPEG images (but no PNG/GIF/... images) with 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// lolcat images from http://icanhascheezburger.com/ - except for images on 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Google. 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)var RequestMatcher = chrome.declarativeWebRequest.RequestMatcher; 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)var IgnoreRules = chrome.declarativeWebRequest.IgnoreRules; 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)var RedirectRequest = chrome.declarativeWebRequest.RedirectRequest; 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)var catImageUrl = 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 'https://i.chzbgr.com/completestore/12/8/23/S__rxG9hIUK4sNuMdTIY9w2.jpg'; 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Registers redirect rules assuming that currently no rules are registered by 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// this extension, yet. 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)function registerRules() { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) var redirectRule = { 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) priority: 100, 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) conditions: [ 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If any of these conditions is fulfilled, the actions are executed. 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new RequestMatcher({ 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Both, the url and the resourceType must match. 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) url: {pathSuffix: '.jpg'}, 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) resourceType: ['image'] 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }), 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new RequestMatcher({ 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) url: {pathSuffix: '.jpeg'}, 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) resourceType: ['image'] 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }), 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ], 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) actions: [ 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new RedirectRequest({redirectUrl: catImageUrl}) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ] 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) var exceptionRule = { 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) priority: 1000, 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) conditions: [ 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // We use hostContains to compensate for various top-level domains. 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new RequestMatcher({url: {hostContains: '.google.'}}) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ], 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) actions: [ 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new IgnoreRules({lowerPriorityThan: 1000}) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ] 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) var callback = function() { 502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (chrome.runtime.lastError) { 512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) console.error('Error adding rules: ' + chrome.runtime.lastError); 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) console.info('Rules successfully installed'); 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chrome.declarativeWebRequest.onRequest.getRules(null, 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) function(rules) { 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) console.info('Now the following rules are registered: ' + 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) JSON.stringify(rules, null, 2)); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }); 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chrome.declarativeWebRequest.onRequest.addRules( 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) [redirectRule, exceptionRule], callback); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)function setup() { 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This function is also called when the extension has been updated. Because 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // registered rules are persisted beyond browser restarts, we remove 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // previously registered rules before registering new ones. 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) chrome.declarativeWebRequest.onRequest.removeRules( 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) null, 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) function() { 732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (chrome.runtime.lastError) { 742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) console.error('Error clearing rules: ' + chrome.runtime.lastError); 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) registerRules(); 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This is triggered when the extension is installed or updated. 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)chrome.runtime.onInstalled.addListener(setup); 83