1 files changed, 476 insertions, 0 deletions
diff --git a/toolkit/components/captivedetect/captivedetect.js b/toolkit/components/captivedetect/captivedetect.js
new file mode 100644
index 000000000..5493ecec6
--- /dev/null
+++ b/toolkit/components/captivedetect/captivedetect.js
@@ -0,0 +1,476 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+'use strict';
+
+const { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
+
+Cu.import('resource://gre/modules/XPCOMUtils.jsm');
+Cu.import('resource://gre/modules/Services.jsm');
+
+XPCOMUtils.defineLazyServiceGetter(this, "gSysMsgr",
+                                   "@mozilla.org/system-message-internal;1",
+                                   "nsISystemMessagesInternal");
+
+const DEBUG = false; // set to true to show debug messages
+
+const kCAPTIVEPORTALDETECTOR_CONTRACTID = '@mozilla.org/toolkit/captive-detector;1';
+const kCAPTIVEPORTALDETECTOR_CID        = Components.ID('{d9cd00ba-aa4d-47b1-8792-b1fe0cd35060}');
+
+const kOpenCaptivePortalLoginEvent = 'captive-portal-login';
+const kAbortCaptivePortalLoginEvent = 'captive-portal-login-abort';
+const kCaptivePortalLoginSuccessEvent = 'captive-portal-login-success';
+const kCaptivePortalCheckComplete = 'captive-portal-check-complete';
+
+const kCaptivePortalSystemMessage = 'captive-portal';
+
+function URLFetcher(url, timeout) {
+  let self = this;
+  let xhr = Cc['@mozilla.org/xmlextras/xmlhttprequest;1']
+              .createInstance(Ci.nsIXMLHttpRequest);
+  xhr.open('GET', url, true);
+  // Prevent the request from reading from the cache.
+  xhr.channel.loadFlags |= Ci.nsIRequest.LOAD_BYPASS_CACHE;
+  // Prevent the request from writing to the cache.
+  xhr.channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
+  // Prevent privacy leaks
+  xhr.channel.loadFlags |= Ci.nsIRequest.LOAD_ANONYMOUS;
+  // The Cache-Control header is only interpreted by proxies and the
+  // final destination. It does not help if a resource is already
+  // cached locally.
+  xhr.setRequestHeader("Cache-Control", "no-cache");
+  // HTTP/1.0 servers might not implement Cache-Control and
+  // might only implement Pragma: no-cache
+  xhr.setRequestHeader("Pragma", "no-cache");
+
+  xhr.timeout = timeout;
+  xhr.ontimeout = function () { self.ontimeout(); };
+  xhr.onerror = function () { self.onerror(); };
+  xhr.onreadystatechange = function(oEvent) {
+    if (xhr.readyState === 4) {
+      if (self._isAborted) {
+        return;
+      }
+      if (xhr.status === 200) {
+        self.onsuccess(xhr.responseText);
+      } else if (xhr.status) {
+        self.onredirectorerror(xhr.status);
+      }
+    }
+  };
+  xhr.send();
+  this._xhr = xhr;
+}
+
+URLFetcher.prototype = {
+  _isAborted: false,
+  ontimeout: function() {},
+  onerror: function() {},
+  abort: function() {
+    if (!this._isAborted) {
+      this._isAborted = true;
+      this._xhr.abort();
+    }
+  },
+}
+
+function LoginObserver(captivePortalDetector) {
+  const LOGIN_OBSERVER_STATE_DETACHED = 0; /* Should not monitor network activity since no ongoing login procedure */
+  const LOGIN_OBSERVER_STATE_IDLE = 1; /* No network activity currently, waiting for a longer enough idle period */
+  const LOGIN_OBSERVER_STATE_BURST = 2; /* Network activity is detected, probably caused by a login procedure */
+  const LOGIN_OBSERVER_STATE_VERIFY_NEEDED = 3; /* Verifing network accessiblity is required after a long enough idle */
+  const LOGIN_OBSERVER_STATE_VERIFYING = 4; /* LoginObserver is probing if public network is available */
+
+  let state = LOGIN_OBSERVER_STATE_DETACHED;
+
+  let timer = Cc['@mozilla.org/timer;1'].createInstance(Ci.nsITimer);
+  let activityDistributor = Cc['@mozilla.org/network/http-activity-distributor;1']
+                              .getService(Ci.nsIHttpActivityDistributor);
+  let urlFetcher = null;
+
+  let waitForNetworkActivity = Services.appinfo.widgetToolkit == "gonk";
+
+  let pageCheckingDone = function pageCheckingDone() {
+    if (state === LOGIN_OBSERVER_STATE_VERIFYING) {
+      urlFetcher = null;
+      // Finish polling the canonical site, switch back to idle state and
+      // waiting for next burst
+      state = LOGIN_OBSERVER_STATE_IDLE;
+      timer.initWithCallback(observer,
+                             captivePortalDetector._pollingTime,
+                             timer.TYPE_ONE_SHOT);
+    }
+  };
+
+  let checkPageContent = function checkPageContent() {
+    debug("checking if public network is available after the login procedure");
+
+    urlFetcher = new URLFetcher(captivePortalDetector._canonicalSiteURL,
+                                captivePortalDetector._maxWaitingTime);
+    urlFetcher.ontimeout = pageCheckingDone;
+    urlFetcher.onerror = pageCheckingDone;
+    urlFetcher.onsuccess = function (content) {
+      if (captivePortalDetector.validateContent(content)) {
+        urlFetcher = null;
+        captivePortalDetector.executeCallback(true);
+      } else {
+        pageCheckingDone();
+      }
+    };
+    urlFetcher.onredirectorerror = pageCheckingDone;
+  };
+
+  // Public interface of LoginObserver
+  let observer = {
+    QueryInterface: XPCOMUtils.generateQI([Ci.nsIHttpActivityObserver,
+                                           Ci.nsITimerCallback]),
+
+    attach: function attach() {
+      if (state === LOGIN_OBSERVER_STATE_DETACHED) {
+        activityDistributor.addObserver(this);
+        state = LOGIN_OBSERVER_STATE_IDLE;
+        timer.initWithCallback(this,
+                               captivePortalDetector._pollingTime,
+                               timer.TYPE_ONE_SHOT);
+        debug('attach HttpObserver for login activity');
+      }
+    },
+
+    detach: function detach() {
+      if (state !== LOGIN_OBSERVER_STATE_DETACHED) {
+        if (urlFetcher) {
+          urlFetcher.abort();
+          urlFetcher = null;
+        }
+        activityDistributor.removeObserver(this);
+        timer.cancel();
+        state = LOGIN_OBSERVER_STATE_DETACHED;
+        debug('detach HttpObserver for login activity');
+      }
+    },
+
+    /*
+     * Treat all HTTP transactions as captive portal login activities.
+     */
+    observeActivity: function observeActivity(aHttpChannel, aActivityType,
+                                              aActivitySubtype, aTimestamp,
+                                              aExtraSizeData, aExtraStringData) {
+      if (aActivityType === Ci.nsIHttpActivityObserver.ACTIVITY_TYPE_HTTP_TRANSACTION
+          && aActivitySubtype === Ci.nsIHttpActivityObserver.ACTIVITY_SUBTYPE_RESPONSE_COMPLETE) {
+        switch (state) {
+          case LOGIN_OBSERVER_STATE_IDLE:
+          case LOGIN_OBSERVER_STATE_VERIFY_NEEDED:
+            state = LOGIN_OBSERVER_STATE_BURST;
+            break;
+          default:
+            break;
+        }
+      }
+    },
+
+    /*
+     * Check if login activity is finished according to HTTP burst.
+     */
+    notify : function notify() {
+      switch (state) {
+        case LOGIN_OBSERVER_STATE_BURST:
+          // Wait while network stays idle for a short period
+          state = LOGIN_OBSERVER_STATE_VERIFY_NEEDED;
+          // Fall though to start polling timer
+        case LOGIN_OBSERVER_STATE_IDLE:
+          if (waitForNetworkActivity) {
+            timer.initWithCallback(this,
+                                   captivePortalDetector._pollingTime,
+                                   timer.TYPE_ONE_SHOT);
+            break;
+          }
+          // if we don't need to wait for network activity, just fall through
+          // to perform a captive portal check.
+        case LOGIN_OBSERVER_STATE_VERIFY_NEEDED:
+          // Polling the canonical website since network stays idle for a while
+          state = LOGIN_OBSERVER_STATE_VERIFYING;
+          checkPageContent();
+          break;
+
+        default:
+          break;
+      }
+    },
+  };
+
+  return observer;
+}
+
+function CaptivePortalDetector() {
+  // Load preference
+  this._canonicalSiteURL = null;
+  this._canonicalSiteExpectedContent = null;
+
+  try {
+    this._canonicalSiteURL =
+      Services.prefs.getCharPref('captivedetect.canonicalURL');
+    this._canonicalSiteExpectedContent =
+      Services.prefs.getCharPref('captivedetect.canonicalContent');
+  } catch (e) {
+    debug('canonicalURL or canonicalContent not set.')
+  }
+
+  this._maxWaitingTime =
+    Services.prefs.getIntPref('captivedetect.maxWaitingTime');
+  this._pollingTime =
+    Services.prefs.getIntPref('captivedetect.pollingTime');
+  this._maxRetryCount =
+    Services.prefs.getIntPref('captivedetect.maxRetryCount');
+  debug('Load Prefs {site=' + this._canonicalSiteURL + ',content='
+        + this._canonicalSiteExpectedContent + ',time=' + this._maxWaitingTime
+        + "max-retry=" + this._maxRetryCount + '}');
+
+  // Create HttpObserver for monitoring the login procedure
+  this._loginObserver = LoginObserver(this);
+
+  this._nextRequestId = 0;
+  this._runningRequest = null;
+  this._requestQueue = []; // Maintain a progress table, store callbacks and the ongoing XHR
+  this._interfaceNames = {}; // Maintain names of the requested network interfaces
+
+  debug('CaptiveProtalDetector initiated, waiting for network connection established');
+}
+
+CaptivePortalDetector.prototype = {
+  classID:   kCAPTIVEPORTALDETECTOR_CID,
+  classInfo: XPCOMUtils.generateCI({classID: kCAPTIVEPORTALDETECTOR_CID,
+                                    contractID: kCAPTIVEPORTALDETECTOR_CONTRACTID,
+                                    classDescription: 'Captive Portal Detector',
+                                    interfaces: [Ci.nsICaptivePortalDetector]}),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsICaptivePortalDetector]),
+
+  // nsICaptivePortalDetector
+  checkCaptivePortal: function checkCaptivePortal(aInterfaceName, aCallback) {
+    if (!this._canonicalSiteURL) {
+      throw Components.Exception('No canonical URL set up.');
+    }
+
+    // Prevent multiple requests on a single network interface
+    if (this._interfaceNames[aInterfaceName]) {
+      throw Components.Exception('Do not allow multiple request on one interface: ' + aInterfaceName);
+    }
+
+    let request = {interfaceName: aInterfaceName};
+    if (aCallback) {
+      let callback = aCallback.QueryInterface(Ci.nsICaptivePortalCallback);
+      request['callback'] = callback;
+      request['retryCount'] = 0;
+    }
+    this._addRequest(request);
+  },
+
+  abort: function abort(aInterfaceName) {
+    debug('abort for ' + aInterfaceName);
+    this._removeRequest(aInterfaceName);
+  },
+
+  finishPreparation: function finishPreparation(aInterfaceName) {
+    debug('finish preparation phase for interface "' + aInterfaceName + '"');
+    if (!this._runningRequest
+        || this._runningRequest.interfaceName !== aInterfaceName) {
+      debug('invalid finishPreparation for ' + aInterfaceName);
+      throw Components.Exception('only first request is allowed to invoke |finishPreparation|');
+    }
+
+    this._startDetection();
+  },
+
+  cancelLogin: function cancelLogin(eventId) {
+    debug('login canceled by user for request "' + eventId + '"');
+    // Captive portal login procedure is canceled by user
+    if (this._runningRequest && this._runningRequest.hasOwnProperty('eventId')) {
+      let id = this._runningRequest.eventId;
+      if (eventId === id) {
+        this.executeCallback(false);
+      }
+    }
+  },
+
+  _applyDetection: function _applyDetection() {
+    debug('enter applyDetection('+ this._runningRequest.interfaceName + ')');
+
+    // Execute network interface preparation
+    if (this._runningRequest.hasOwnProperty('callback')) {
+      this._runningRequest.callback.prepare();
+    } else {
+      this._startDetection();
+    }
+  },
+
+  _startDetection: function _startDetection() {
+    debug('startDetection {site=' + this._canonicalSiteURL + ',content='
+          + this._canonicalSiteExpectedContent + ',time=' + this._maxWaitingTime + '}');
+    let self = this;
+
+    let urlFetcher = new URLFetcher(this._canonicalSiteURL, this._maxWaitingTime);
+
+    let mayRetry = this._mayRetry.bind(this);
+
+    urlFetcher.ontimeout = mayRetry;
+    urlFetcher.onerror = mayRetry;
+    urlFetcher.onsuccess = function (content) {
+      if (self.validateContent(content)) {
+        self.executeCallback(true);
+      } else {
+        // Content of the canonical website has been overwrite
+        self._startLogin();
+      }
+    };
+    urlFetcher.onredirectorerror = function (status) {
+      if (status >= 300 && status <= 399) {
+        // The canonical website has been redirected to an unknown location
+        self._startLogin();
+      } else {
+        mayRetry();
+      }
+    };
+
+    this._runningRequest['urlFetcher'] = urlFetcher;
+  },
+
+  _startLogin: function _startLogin() {
+    let id = this._allocateRequestId();
+    let details = {
+      type: kOpenCaptivePortalLoginEvent,
+      id: id,
+      url: this._canonicalSiteURL,
+    };
+    this._loginObserver.attach();
+    this._runningRequest['eventId'] = id;
+    this._sendEvent(kOpenCaptivePortalLoginEvent, details);
+    gSysMsgr.broadcastMessage(kCaptivePortalSystemMessage, {});
+  },
+
+  _mayRetry: function _mayRetry() {
+    if (this._runningRequest.retryCount++ < this._maxRetryCount) {
+      debug('retry-Detection: ' + this._runningRequest.retryCount + '/' + this._maxRetryCount);
+      this._startDetection();
+    } else {
+      this.executeCallback(false);
+    }
+  },
+
+  executeCallback: function executeCallback(success) {
+    if (this._runningRequest) {
+      debug('callback executed');
+      if (this._runningRequest.hasOwnProperty('callback')) {
+        this._runningRequest.callback.complete(success);
+      }
+
+      // Only when the request has a event id and |success| is true
+      // do we need to notify the login-success event.
+      if (this._runningRequest.hasOwnProperty('eventId') && success) {
+        let details = {
+          type: kCaptivePortalLoginSuccessEvent,
+          id: this._runningRequest['eventId'],
+        };
+        this._sendEvent(kCaptivePortalLoginSuccessEvent, details);
+      }
+
+      // Continue the following request
+      this._runningRequest['complete'] = true;
+      this._removeRequest(this._runningRequest.interfaceName);
+    }
+  },
+
+  _sendEvent: function _sendEvent(topic, details) {
+    debug('sendEvent "' + JSON.stringify(details) + '"');
+    Services.obs.notifyObservers(this,
+                                 topic,
+                                 JSON.stringify(details));
+  },
+
+  validateContent: function validateContent(content) {
+    debug('received content: ' + content);
+    let valid = content === this._canonicalSiteExpectedContent;
+    // We need a way to indicate that a check has been performed, and if we are
+    // still in a captive portal.
+    this._sendEvent(kCaptivePortalCheckComplete, !valid);
+    return valid;
+  },
+
+  _allocateRequestId: function _allocateRequestId() {
+    let newId = this._nextRequestId++;
+    return newId.toString();
+  },
+
+  _runNextRequest: function _runNextRequest() {
+    let nextRequest = this._requestQueue.shift();
+    if (nextRequest) {
+      this._runningRequest = nextRequest;
+      this._applyDetection();
+    }
+  },
+
+  _addRequest: function _addRequest(request) {
+    this._interfaceNames[request.interfaceName] = true;
+    this._requestQueue.push(request);
+    if (!this._runningRequest) {
+      this._runNextRequest();
+    }
+  },
+
+  _removeRequest: function _removeRequest(aInterfaceName) {
+    if (!this._interfaceNames[aInterfaceName]) {
+      return;
+    }
+
+    delete this._interfaceNames[aInterfaceName];
+
+    if (this._runningRequest
+        && this._runningRequest.interfaceName === aInterfaceName) {
+      this._loginObserver.detach();
+
+      if (!this._runningRequest.complete) {
+        // Abort the user login procedure
+        if (this._runningRequest.hasOwnProperty('eventId')) {
+          let details = {
+            type: kAbortCaptivePortalLoginEvent,
+            id: this._runningRequest.eventId
+          };
+          this._sendEvent(kAbortCaptivePortalLoginEvent, details);
+        }
+
+        // Abort the ongoing HTTP request
+        if (this._runningRequest.hasOwnProperty('urlFetcher')) {
+          this._runningRequest.urlFetcher.abort();
+        }
+      }
+
+      debug('remove running request');
+      this._runningRequest = null;
+
+      // Continue next pending reqeust if the ongoing one has been aborted
+      this._runNextRequest();
+      return;
+    }
+
+    // Check if a pending request has been aborted
+    for (let i = 0; i < this._requestQueue.length; i++) {
+      if (this._requestQueue[i].interfaceName == aInterfaceName) {
+        this._requestQueue.splice(i, 1);
+
+        debug('remove pending request #' + i + ', remaining ' + this._requestQueue.length);
+        break;
+      }
+    }
+  },
+};
+
+var debug;
+if (DEBUG) {
+  debug = function (s) {
+    dump('-*- CaptivePortalDetector component: ' + s + '\n');
+  };
+} else {
+  debug = function (s) {};
+}
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([CaptivePortalDetector]);