зеркало из https://github.com/mozilla/gecko-dev.git
551 строка
16 KiB
JavaScript
551 строка
16 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
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Components.utils.import("resource://gre/modules/Services.jsm");
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const Ci = Components.interfaces;
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const Cc = Components.classes;
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const Cu = Components.utils;
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const POSITION_UNAVAILABLE = Ci.nsIDOMGeoPositionError.POSITION_UNAVAILABLE;
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const SETTINGS_DEBUG_ENABLED = "geolocation.debugging.enabled";
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const SETTINGS_CHANGED_TOPIC = "mozsettings-changed";
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const SETTINGS_WIFI_ENABLED = "wifi.enabled";
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let gLoggingEnabled = false;
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/*
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The gLocationRequestTimeout controls how long we wait on receiving an update
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from the Wifi subsystem. If this timer fires, we believe the Wifi scan has
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had a problem and we no longer can use Wifi to position the user this time
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around (we will continue to be hopeful that Wifi will recover).
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This timeout value is also used when Wifi scanning is disabled (see
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gWifiScanningEnabled). In this case, we use this timer to collect cell/ip
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data and xhr it to the location server.
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*/
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let gLocationRequestTimeout = 5000;
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let gWifiScanningEnabled = true;
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let gCellScanningEnabled = false;
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function LOG(aMsg) {
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if (gLoggingEnabled) {
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aMsg = "*** WIFI GEO: " + aMsg + "\n";
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Cc["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService).logStringMessage(aMsg);
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dump(aMsg);
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}
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}
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function CachedRequest(loc, cellInfo, wifiList) {
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this.location = loc;
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let wifis = new Set();
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if (wifiList) {
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for (let i = 0; i < wifiList.length; i++) {
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wifis.add(wifiList[i].macAddress);
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}
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}
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// Use only these values for equality
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// (the JSON will contain additional values in future)
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function makeCellKey(cell) {
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return "" + cell.radio + ":" + cell.mobileCountryCode + ":" +
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cell.mobileNetworkCode + ":" + cell.locationAreaCode + ":" +
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cell.cellId;
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}
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let cells = new Set();
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if (cellInfo) {
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for (let i = 0; i < cellInfo.length; i++) {
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cells.add(makeCellKey(cellInfo[i]));
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}
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}
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this.hasCells = () => cells.size > 0;
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this.hasWifis = () => wifis.size > 0;
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// if fields match
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this.isCellEqual = function(cellInfo) {
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if (!this.hasCells()) {
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return false;
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}
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let len1 = cells.size;
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let len2 = cellInfo.length;
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if (len1 != len2) {
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LOG("cells not equal len");
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return false;
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}
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for (let i = 0; i < len2; i++) {
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if (!cells.has(makeCellKey(cellInfo[i]))) {
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return false;
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}
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}
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return true;
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};
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// if 50% of the SSIDS match
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this.isWifiApproxEqual = function(wifiList) {
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if (!this.hasWifis()) {
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return false;
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}
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// if either list is a 50% subset of the other, they are equal
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let common = 0;
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for (let i = 0; i < wifiList.length; i++) {
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if (wifis.has(wifiList[i].macAddress)) {
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common++;
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}
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}
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let kPercentMatch = 0.5;
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return common >= (Math.max(wifis.size, wifiList.length) * kPercentMatch);
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};
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this.isGeoip = function() {
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return !this.hasCells() && !this.hasWifis();
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};
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this.isCellAndWifi = function() {
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return this.hasCells() && this.hasWifis();
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};
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this.isCellOnly = function() {
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return this.hasCells() && !this.hasWifis();
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};
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this.isWifiOnly = function() {
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return this.hasWifis() && !this.hasCells();
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};
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}
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let gCachedRequest = null;
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let gDebugCacheReasoning = ""; // for logging the caching logic
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// This function serves two purposes:
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// 1) do we have a cached request
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// 2) is the cached request better than what newCell and newWifiList will obtain
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// If the cached request exists, and we know it to have greater accuracy
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// by the nature of its origin (wifi/cell/geoip), use its cached location.
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//
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// If there is more source info than the cached request had, return false
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// In other cases, MLS is known to produce better/worse accuracy based on the
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// inputs, so base the decision on that.
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function isCachedRequestMoreAccurateThanServerRequest(newCell, newWifiList)
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{
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gDebugCacheReasoning = "";
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let isNetworkRequestCacheEnabled = true;
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try {
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// Mochitest needs this pref to simulate request failure
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isNetworkRequestCacheEnabled = Services.prefs.getBoolPref("geo.wifi.debug.requestCache.enabled");
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if (!isNetworkRequestCacheEnabled) {
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gCachedRequest = null;
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}
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} catch (e) {}
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if (!gCachedRequest || !isNetworkRequestCacheEnabled) {
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gDebugCacheReasoning = "No cached data";
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return false;
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}
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if (!newCell && !newWifiList) {
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gDebugCacheReasoning = "New req. is GeoIP.";
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return true;
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}
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if (newCell && newWifiList && (gCachedRequest.isCellOnly() || gCachedRequest.isWifiOnly())) {
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gDebugCacheReasoning = "New req. is cell+wifi, cache only cell or wifi.";
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return false;
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}
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if (newCell && gCachedRequest.isWifiOnly()) {
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// In order to know if a cell-only request should trump a wifi-only request
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// need to know if wifi is low accuracy. >5km would be VERY low accuracy,
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// it is worth trying the cell
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var isHighAccuracyWifi = gCachedRequest.location.coords.accuracy < 5000;
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gDebugCacheReasoning = "Req. is cell, cache is wifi, isHigh:" + isHighAccuracyWifi;
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return isHighAccuracyWifi;
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}
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let hasEqualCells = false;
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if (newCell) {
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hasEqualCells = gCachedRequest.isCellEqual(newCell);
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}
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let hasEqualWifis = false;
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if (newWifiList) {
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hasEqualWifis = gCachedRequest.isWifiApproxEqual(newWifiList);
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}
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gDebugCacheReasoning = "EqualCells:" + hasEqualCells + " EqualWifis:" + hasEqualWifis;
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if (gCachedRequest.isCellOnly()) {
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gDebugCacheReasoning += ", Cell only.";
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if (hasEqualCells) {
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return true;
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}
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} else if (gCachedRequest.isWifiOnly() && hasEqualWifis) {
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gDebugCacheReasoning +=", Wifi only."
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return true;
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} else if (gCachedRequest.isCellAndWifi()) {
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gDebugCacheReasoning += ", Cache has Cell+Wifi.";
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if ((hasEqualCells && hasEqualWifis) ||
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(!newWifiList && hasEqualCells) ||
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(!newCell && hasEqualWifis))
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{
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return true;
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}
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}
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return false;
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}
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function WifiGeoCoordsObject(lat, lon, acc, alt, altacc) {
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this.latitude = lat;
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this.longitude = lon;
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this.accuracy = acc;
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this.altitude = alt;
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this.altitudeAccuracy = altacc;
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}
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WifiGeoCoordsObject.prototype = {
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIDOMGeoPositionCoords])
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};
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function WifiGeoPositionObject(lat, lng, acc) {
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this.coords = new WifiGeoCoordsObject(lat, lng, acc, 0, 0);
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this.address = null;
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this.timestamp = Date.now();
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}
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WifiGeoPositionObject.prototype = {
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIDOMGeoPosition])
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};
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function WifiGeoPositionProvider() {
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try {
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gLoggingEnabled = Services.prefs.getBoolPref("geo.wifi.logging.enabled");
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} catch (e) {}
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try {
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gLocationRequestTimeout = Services.prefs.getIntPref("geo.wifi.timeToWaitBeforeSending");
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} catch (e) {}
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try {
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gWifiScanningEnabled = Services.prefs.getBoolPref("geo.wifi.scan");
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} catch (e) {}
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try {
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gCellScanningEnabled = Services.prefs.getBoolPref("geo.cell.scan");
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} catch (e) {}
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this.wifiService = null;
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this.timer = null;
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this.started = false;
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}
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WifiGeoPositionProvider.prototype = {
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classID: Components.ID("{77DA64D3-7458-4920-9491-86CC9914F904}"),
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIGeolocationProvider,
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Ci.nsIWifiListener,
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Ci.nsITimerCallback,
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Ci.nsIObserver]),
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listener: null,
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observe: function(aSubject, aTopic, aData) {
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if (aTopic != SETTINGS_CHANGED_TOPIC) {
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return;
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}
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try {
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if ("wrappedJSObject" in aSubject) {
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aSubject = aSubject.wrappedJSObject;
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}
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if (aSubject.key == SETTINGS_DEBUG_ENABLED) {
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gLoggingEnabled = aSubject.value;
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} else if (aSubject.key == SETTINGS_WIFI_ENABLED) {
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gWifiScanningEnabled = aSubject.value;
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}
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} catch (e) {
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}
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},
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resetTimer: function() {
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if (this.timer) {
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this.timer.cancel();
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this.timer = null;
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}
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// wifi thread triggers WifiGeoPositionProvider to proceed, with no wifi, do manual timeout
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this.timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
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this.timer.initWithCallback(this,
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gLocationRequestTimeout,
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this.timer.TYPE_REPEATING_SLACK);
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},
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startup: function() {
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if (this.started)
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return;
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this.started = true;
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let self = this;
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let settingsCallback = {
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handle: function(name, result) {
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// Stop the B2G UI setting from overriding the js prefs setting, and turning off logging
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// If gLoggingEnabled is already on during startup, that means it was set in js prefs.
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if (name == SETTINGS_DEBUG_ENABLED && !gLoggingEnabled) {
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gLoggingEnabled = result;
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} else if (name == SETTINGS_WIFI_ENABLED) {
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gWifiScanningEnabled = result;
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if (self.wifiService) {
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self.wifiService.stopWatching(self);
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}
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if (gWifiScanningEnabled) {
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self.wifiService = Cc["@mozilla.org/wifi/monitor;1"].getService(Ci.nsIWifiMonitor);
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self.wifiService.startWatching(self);
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}
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}
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},
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handleError: function(message) {
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gLoggingEnabled = false;
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LOG("settings callback threw an exception, dropping");
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}
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};
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Services.obs.addObserver(this, SETTINGS_CHANGED_TOPIC, false);
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let settingsService = Cc["@mozilla.org/settingsService;1"];
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if (settingsService) {
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let settings = settingsService.getService(Ci.nsISettingsService);
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settings.createLock().get(SETTINGS_WIFI_ENABLED, settingsCallback);
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settings.createLock().get(SETTINGS_DEBUG_ENABLED, settingsCallback);
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}
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if (gWifiScanningEnabled && Cc["@mozilla.org/wifi/monitor;1"]) {
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if (this.wifiService) {
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this.wifiService.stopWatching(this);
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}
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this.wifiService = Cc["@mozilla.org/wifi/monitor;1"].getService(Ci.nsIWifiMonitor);
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this.wifiService.startWatching(this);
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}
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this.resetTimer();
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LOG("startup called.");
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},
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watch: function(c) {
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this.listener = c;
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},
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shutdown: function() {
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LOG("shutdown called");
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if (this.started == false) {
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return;
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}
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// Without clearing this, we could end up using the cache almost indefinitely
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// TODO: add logic for cache lifespan, for now just be safe and clear it
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gCachedRequest = null;
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if (this.timer) {
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this.timer.cancel();
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this.timer = null;
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}
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if(this.wifiService) {
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this.wifiService.stopWatching(this);
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this.wifiService = null;
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}
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Services.obs.removeObserver(this, SETTINGS_CHANGED_TOPIC);
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this.listener = null;
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this.started = false;
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},
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setHighAccuracy: function(enable) {
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},
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onChange: function(accessPoints) {
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// we got some wifi data, rearm the timer.
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this.resetTimer();
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function isPublic(ap) {
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let mask = "_nomap"
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let result = ap.ssid.indexOf(mask, ap.ssid.length - mask.length);
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if (result != -1) {
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LOG("Filtering out " + ap.ssid + " " + result);
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}
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return result;
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};
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function sort(a, b) {
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return b.signal - a.signal;
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};
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function encode(ap) {
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return { 'macAddress': ap.mac, 'signalStrength': ap.signal };
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};
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let wifiData = null;
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if (accessPoints) {
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wifiData = accessPoints.filter(isPublic).sort(sort).map(encode);
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}
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this.sendLocationRequest(wifiData);
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},
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onError: function (code) {
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LOG("wifi error: " + code);
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this.sendLocationRequest(null);
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},
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getMobileInfo: function() {
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LOG("getMobileInfo called");
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try {
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let radioService = Cc["@mozilla.org/ril;1"]
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.getService(Ci.nsIRadioInterfaceLayer);
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let service = Cc["@mozilla.org/mobileconnection/mobileconnectionservice;1"]
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.getService(Ci.nsIMobileConnectionService);
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let result = [];
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for (let i = 0; i < service.numItems; i++) {
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LOG("Looking for SIM in slot:" + i + " of " + service.numItems);
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let connection = service.getItemByServiceId(i);
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let voice = connection && connection.voice;
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let cell = voice && voice.cell;
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let type = voice && voice.type;
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let network = voice && voice.network;
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if (network && cell && type) {
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let radioTechFamily;
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switch (type) {
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case "gsm":
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case "gprs":
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case "edge":
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radioTechFamily = "gsm";
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break;
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case "umts":
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case "hsdpa":
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case "hsupa":
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case "hspa":
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case "hspa+":
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radioTechFamily = "wcdma";
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break;
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case "lte":
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radioTechFamily = "lte";
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break;
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// CDMA cases to be handled in bug 1010282
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};
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result.push({ radioType: radioTechFamily,
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mobileCountryCode: voice.network.mcc,
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mobileNetworkCode: voice.network.mnc,
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locationAreaCode: cell.gsmLocationAreaCode,
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cellId: cell.gsmCellId });
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}
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}
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return result;
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} catch (e) {
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return null;
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}
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},
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notify: function (timer) {
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this.sendLocationRequest(null);
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},
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sendLocationRequest: function (wifiData) {
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let data = { cellTowers: undefined, wifiAccessPoints: undefined };
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if (wifiData && wifiData.length >= 2) {
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data.wifiAccessPoints = wifiData;
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}
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if (gCellScanningEnabled) {
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let cellData = this.getMobileInfo();
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if (cellData && cellData.length > 0) {
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data.cellTowers = cellData;
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}
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}
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let useCached = isCachedRequestMoreAccurateThanServerRequest(data.cellTowers,
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data.wifiAccessPoints);
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LOG("Use request cache:" + useCached + " reason:" + gDebugCacheReasoning);
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if (useCached) {
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gCachedRequest.location.timestamp = Date.now();
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this.notifyListener("update", [gCachedRequest.location]);
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return;
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}
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// From here on, do a network geolocation request //
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let url = Services.urlFormatter.formatURLPref("geo.wifi.uri");
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LOG("Sending request");
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let xhr = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
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.createInstance(Ci.nsIXMLHttpRequest);
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this.notifyListener("locationUpdatePending");
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try {
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xhr.open("POST", url, true);
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} catch (e) {
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this.notifyListener("notifyError",
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[POSITION_UNAVAILABLE]);
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return;
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}
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xhr.setRequestHeader("Content-Type", "application/json; charset=UTF-8");
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xhr.responseType = "json";
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xhr.mozBackgroundRequest = true;
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xhr.channel.loadFlags = Ci.nsIChannel.LOAD_ANONYMOUS;
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xhr.timeout = Services.prefs.getIntPref("geo.wifi.xhr.timeout");
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xhr.ontimeout = (function() {
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LOG("Location request XHR timed out.")
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this.notifyListener("notifyError",
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[POSITION_UNAVAILABLE]);
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}).bind(this);
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xhr.onerror = (function() {
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this.notifyListener("notifyError",
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[POSITION_UNAVAILABLE]);
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}).bind(this);
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xhr.onload = (function() {
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LOG("server returned status: " + xhr.status + " --> " + JSON.stringify(xhr.response));
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if ((xhr.channel instanceof Ci.nsIHttpChannel && xhr.status != 200) ||
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!xhr.response || !xhr.response.location) {
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this.notifyListener("notifyError",
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[POSITION_UNAVAILABLE]);
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|
return;
|
|
}
|
|
|
|
let newLocation = new WifiGeoPositionObject(xhr.response.location.lat,
|
|
xhr.response.location.lng,
|
|
xhr.response.accuracy);
|
|
|
|
this.notifyListener("update", [newLocation]);
|
|
gCachedRequest = new CachedRequest(newLocation, data.cellTowers, data.wifiAccessPoints);
|
|
}).bind(this);
|
|
|
|
var requestData = JSON.stringify(data);
|
|
LOG("sending " + requestData);
|
|
xhr.send(requestData);
|
|
},
|
|
|
|
notifyListener: function(listenerFunc, args) {
|
|
args = args || [];
|
|
try {
|
|
this.listener[listenerFunc].apply(this.listener, args);
|
|
} catch(e) {
|
|
Cu.reportError(e);
|
|
}
|
|
}
|
|
};
|
|
|
|
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([WifiGeoPositionProvider]);
|