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const DEBUG = 0;
const DIRECT_PROXY = {
type: 'direct'
};
const DEFAULT_PROXY_SETTINGS = {
type: 'socks',
host: '127.0.0.1',
port: 9050,
username: '',
password: '',
proxyDNS: true
};
let proxies = [ DIRECT_PROXY, DIRECT_PROXY ];
var skipLocal = 1;
var pendingRequests = [];
var currentProxy = 0;
function buttonClicked() {
currentProxy = (currentProxy ? 0 : 1);
browser.storage.local.set({ currentProxy: currentProxy });
updateState();
}
function updateState() {
if(currentProxy==0)
{
if (DEBUG)
console.log('Update state (proxy off)');
browser.browserAction.setIcon({path: "icons/p1.svg"});
browser.browserAction.setTitle({title: "Tor Proxy (disabled)"});
}
else
{
if (DEBUG)
console.log('Update state (proxy on)');
browser.browserAction.setIcon({path: "icons/p2.svg"});
browser.browserAction.setTitle({title: "Tor Proxy (enabled)"});
}
}
function settingsChanged(settings) {
if ("proxySettings" in settings)
proxies[1] = settings.proxySettings.newValue;
if ("skipLocal" in settings)
skipLocal = settings.skipLocal.newValue;
}
function completed(requestDetails) {
if (DEBUG) {
console.log("completed request: " + requestDetails.requestId);
}
var index = pendingRequests.indexOf(requestDetails.requestId);
if (index > -1) {
pendingRequests.splice(index, 1);
}
}
function provideCredentialsSync(requestDetails) {
if (!requestDetails.isProxy)
return;
if (!currentProxy == 1)
return;
if (pendingRequests.indexOf(requestDetails.requestId) != -1) {
//if we've seen the request before, assume bad credentials and give up
console.log("Bad proxy credentials for request: " + requestDetails.requestId);
return {cancel:true};
}
var credentials = {
username: proxies[1].username,
password: proxies[1].password
}
pendingRequests.push(requestDetails.requestId);
if (DEBUG) {
console.log(`Providing proxy credentials for request: ${requestDetails.requestId} username: ${credentials.username}`);
}
return {authCredentials: credentials};
}
function isLocalIPv4(host)
{
var octets = /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/.exec(host);
if(!octets)
return false;
if(octets[1]>255||octets[2]>255||octets[3]>255||octets[4]>255)
return false;
if(octets[1]==10||octets[1]==127) //class A or local loopback
return true;
if(octets[1]==172&&octets[2]>=16&&octets[2]<=31) //class B
return true;
if(octets[1]==192&&octets[2]==168) //class C
return true;
return false;
}
function isLocal(host)
{
if(host.indexOf('.') == -1)
return true;
if(host.endsWith(".local"))
return true;
if(host=="::1")
return true;
return(isLocalIPv4(host));
}
function handleProxyRequest(requestInfo) {
const url = new URL(requestInfo.url);
var host = url.hostname;
var proxyNum = currentProxy;
if (skipLocal) {
if(isLocal(host)) {
if (DEBUG)
console.log(`Local host detected: ${host}`);
proxyNum = 0;
}
}
if (DEBUG) {
console.log(`Proxying: ${url.hostname}`);
console.log(proxies[proxyNum]);
}
return(proxies[proxyNum]);
}
browser.storage.local.get({ currentProxy: 0, skipLocal: true, proxySettings: DEFAULT_PROXY_SETTINGS }, items=>{
currentProxy = items.currentProxy;
skipLocal = items.skipLocal;
proxies[1] = items.proxySettings;
updateState();
});
browser.storage.onChanged.addListener(settingsChanged);
browser.browserAction.onClicked.addListener(buttonClicked);
browser.proxy.onRequest.addListener(handleProxyRequest, {urls: ["<all_urls>"]});
browser.proxy.onError.addListener(error => {
console.error(`Proxy error: ${error.message}`);
});
browser.webRequest.onAuthRequired.addListener(
provideCredentialsSync,
{urls: ["<all_urls>"]},
["blocking"]
);
browser.webRequest.onCompleted.addListener(
completed,
{urls: ["<all_urls>"]}
);
browser.webRequest.onErrorOccurred.addListener(
completed,
{urls: ["<all_urls>"]}
);
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