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Diffstat (limited to 'background.js')
| -rw-r--r-- | background.js | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/background.js b/background.js deleted file mode 100644 index 4dbbdd3..0000000 --- a/background.js +++ /dev/null @@ -1,222 +0,0 @@ - -//This is the background script. It is responsible for actually redirecting requests, -//as well as monitoring changes in the redirects and the disabled status and reacting to them. - -//TODO: Better browser detection... -var isFirefox = false; - -if (typeof chrome == 'undefined') { - isFirefox = true; - var firefoxShim = require('./firefox/shim'); - chrome = firefoxShim.chrome; - Redirect = firefoxShim.Redirect; -} -//Hopefully Firefox will fix this at some point and we can just use onBeforeRequest everywhere... -var redirectEvent = isFirefox ? chrome.webRequest.onBeforeSendHeaders : chrome.webRequest.onBeforeRequest; - -//Redirects partitioned by request type, so we have to run through -//the minimum number of redirects for each request. -var partitionedRedirects = {}; - -//Keep track of tabids where the main_frame url has been redirected. -//Mark it as green until a new url is loaded. -var tabIdToIcon = { - -}; - -//Cache of urls that have just been redirected to. They will not be redirected again, to -//stop recursive redirects, and endless redirect chains. -//Key is url, value is timestamp of redirect. -var ignoreNextRequest = { - -}; - -function log(msg) { - if (log.enabled) { - console.log('REDIRECTOR: ' + msg); - } -} -log.enabled = true; - -function setIcon(image19, image38, tabId) { - var data = { - path: { - 19: image19, - 38: image38 - } - }; - if (typeof tabId !== 'undefined') { - data.tabId = tabId; - } - chrome.browserAction.setIcon(data, function(tab) { - var err = chrome.runtime.lastError; - if (err) { - //If not checked we will get unchecked errors in the background page console... - log('Error in SetIcon: ' + err.message); - } - }); -} - -//This is the actual function that gets called for each request and must -//decide whether or not we want to redirect. -function checkRedirects(details) { - - //We only allow GET request to be redirected, don't want to accidentally redirect - //sensitive POST parameters - if (details.method != 'GET') { - return null; - } - - log('Checking: ' + details.type + ': ' + details.url); - - var list = partitionedRedirects[details.type]; - if (!list) { - log('No list for type: ' + details.type); - return null; - } - - var timestamp = ignoreNextRequest[details.url]; - if (timestamp) { - log('Ignoring ' + details.url + ', was just redirected ' + (new Date().getTime()-timestamp) + 'ms ago'); - delete ignoreNextRequest[details.url]; - return null; - } - - for (var i = 0; i < list.length; i++) { - var r = list[i]; - var result = r.getMatch(details.url); - - if (result.isMatch) { - - log('Redirecting ' + details.url + ' ===> ' + result.redirectTo + ', type: ' + details.type + ', pattern: ' + r.includePattern); - - /* Unfortunately the setBrowserIcon for a specific tab function is way too unreliable, fails all the time with tab not found, - even though the tab is there. So, for now I'm cancelling this feature, which would have been pretty great ... :/ - if (details.type == 'main_frame') { - log('Setting icon on tab ' + details.tabId + ' to green'); - - setIcon("images/icon19redirected.png", "images/icon38redirected.png", details.tabId); - tabIdToIcon[details.tabId] = true; - }*/ - ignoreNextRequest[result.redirectTo] = new Date().getTime(); - - return { redirectUrl: result.redirectTo }; - } - } - - /* Cancelled for now because of setBrowserIcon being really unreliable... - if (details.type == 'main_frame' && tabIdToIcon[details.tabId]) { - log('Setting icon on tab ' + details.tabId + ' back to active'); - setIcon("images/icon19active.png", "images/icon38active.png", details.tabId); - delete tabIdToIcon[details.tabId]; - }*/ - - return null; -} - -//Monitor changes in data, and setup everything again. -//This could probably be optimized to not do everything on every change -//but why bother? -chrome.storage.onChanged.addListener(function(changes, namespace) { - if (changes.disabled) { - updateIcon(); - - if (changes.disabled.newValue == true) { - log('Disabling Redirector, removing listener'); - redirectEvent.removeListener(checkRedirects); - } else { - log('Enabling Redirector, setting up listener'); - setUpRedirectListener(); - } - } - - if (changes.redirects) { - log('Redirects have changed, setting up listener again'); - setUpRedirectListener(); - } -}); - -//Creates a filter to pass to the listener so we don't have to run through -//all the redirects for all the request types we don't have any redirects for anyway. -function createFilter(redirects) { - var types = []; - for (var i = 0; i < redirects.length; i++) { - redirects[i].appliesTo.forEach(function(type) { - if (types.indexOf(type) == -1) { - types.push(type); - } - }); - } - types.sort(); - - return { - urls: ["http://*/*", "https://*/*"], - types : types - }; -} - -function createPartitionedRedirects(redirects) { - var partitioned = {}; - - for (var i = 0; i < redirects.length; i++) { - var redirect = new Redirect(redirects[i]); - redirect.compile(); - for (var j=0; j<redirect.appliesTo.length;j++) { - var requestType = redirect.appliesTo[j]; - if (partitioned[requestType]) { - partitioned[requestType].push(redirect); - } else { - partitioned[requestType] = [redirect]; - } - } - } - return partitioned; -} - -//Sets up the listener, partitions the redirects, creates the appropriate filters etc. -function setUpRedirectListener() { - - redirectEvent.removeListener(checkRedirects); //Unsubscribe first, in case there are changes... - - chrome.storage.local.get({redirects:'firstrun'}, function(obj) { - var redirects = obj.redirects; - - if (redirects === 'firstrun') { - log('No redirects to set up, first run of extension'); - //TODO: import old Firefox redirects - return; - } - - if (redirects.length == 0) { - return; - } - - partitionedRedirects = createPartitionedRedirects(redirects); - var filter = createFilter(redirects); - - log('Setting filter for listener: ' + JSON.stringify(filter)); - redirectEvent.addListener(checkRedirects, filter, ["blocking"]); - }); -} - -function updateIcon() { - chrome.storage.local.get({disabled:false}, function(obj) { - if (obj.disabled) { - setIcon("images/icon19disabled.png", "images/icon38disabled.png"); - } else { - setIcon("images/icon19active.png", "images/icon38active.png"); - } - }); -} - -//First time setup -updateIcon(); -chrome.storage.local.get({disabled:false}, function(obj) { - if (!obj.disabled) { - setUpRedirectListener(); - } else { - log('Redirector is disabled'); - } -}); -log('Redirector starting up...'); -
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