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/*
* Module : background.js
* Copyright : (c) 2011-2012, Galois, Inc.
*
* Maintainer :
* Stability : Provisional
* Portability: Portable
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var fiveui = fiveui || {};
(function() {
/**
* @constructor
*
* @param {!function(!string):!string} dataLoader
*/
fiveui.Background = function(settings, updateWidget, loadScripts, dataLoader) {
// Initialize a storage mechanism for FiveUI.
// Chrome utilizes HTML5's localStorage API as a backend, but other
// contexts (such as Firefox) would supply a different backend
// storage to the settings constructor.
//
// The data in settings is persisted across executions of the
// context and the plugin. It is used for long-term storage of user
// preferences, rule sets, and similarly long-lived FiveUI settings.
this.settings = settings;
// the state of all managed tabs
this.state = new fiveui.State(settings);
// how we communicate with the status widget
this.updateWidget = updateWidget;
// how we signal the browser to load a content script
this.loadScripts = loadScripts;
this.dataLoader = dataLoader;
};
/**
* NOTE: As compute nodes get injected first, there's a chance that if send
* ReportProblem or ReportStats too early, the uiPort element of the tabState
* might not be setup yet. This will cause some strange problems, and we should
* consider reversing the order that the injection happens in.
*/
fiveui.Background.prototype._registerComputeListeners = function(port, tabState){
var bg = this;
port.on('ReportProblem', function(request) {
var problem = fiveui.Problem.fromJSON(request);
if(tabState.addProblem(problem) && tabState.uiPort != null) {
bg.updateWidget(tabState);
tabState.uiPort.emit('ShowProblem', problem);
}
});
port.on('ReportStats', function (stats) {
if (tabState.addStats(stats) && tabState.uiPort != null) {
bg.updateWidget(tabState);
tabState.uiPort.emit('ShowStats', stats);
}
});
};
fiveui.Background.prototype._registerUiListeners = function(port, tabState){
var bg = this;
port.on('Position', function(request) {
tabState.winState.x = request.left;
tabState.winState.y = request.top;
});
port.on('Size', function(request) {
tabState.winState.width = request.width;
tabState.winState.height = request.height;
});
port.on('CloseUI', function(request) {
tabState.winState.closed = true;
});
port.on('ClearProblems', function(request) {
tabState.clearProblems();
bg.updateWidget(tabState);
});
port.on('MaskRules', function(request) {
_.each(tabState.computePorts, function(cp) {
cp.emit('MaskRules', null);
});
});
port.on('UnmaskRules', function(request) {
_.each(tabState.computePorts, function(cp) {
cp.emit('UnmaskRules', null);
});
});
};
/**
* Accept a new connection from a content script.
*/
fiveui.Background.prototype.connect = function(tabId, port, url, isUiPort) {
var tabState = this.state.acquireTabState(tabId);
if (isUiPort) {
tabState.uiPort = port;
this._registerUiListeners(port, tabState);
port.emit('RestoreUI', tabState.toEmit());
this.updateWidget(tabState);
} else {
tabState.computePorts.push(port);
this._registerComputeListeners(port, tabState);
// get the rule set and send it down to the injected page:
var ruleSet = this.settings.checkUrl(url);
if (ruleSet == null) {
console.err('could not find url pattern for tab.url, but one was strongly expected');
} else {
port.emit('SetRules', _.pick(ruleSet, ["dependencies", "rules"]));
}
}
};
/**
* @param {!number} tabId
* @param {!string} url
* @param {*} data
*/
fiveui.Background.prototype.pageLoad = function(tabId, url, data) {
var ruleSet = this.settings.checkUrl(url);
if (ruleSet == null) {
this.updateWidget(null);
} else {
var tabState = this.state.acquireTabState(tabId);
// clear out old ports
tabState.uiPort = null;
tabState.computePorts = [];
this.updateWidget(tabState);
var computeScripts =
[ this.dataLoader('underscore.js')
, this.dataLoader('jquery/jquery-1.8.3.js')
, this.dataLoader('md5.js')
, this.dataLoader('injected/prelude.js')
, this.dataLoader('injected/jquery-plugins.js')
, this.dataLoader('injected/compute.js')
];
this.loadScripts(tabId, computeScripts, true, data);
var uiScripts =
[ this.dataLoader('underscore.js')
, this.dataLoader('jquery/bundled.css')
, this.dataLoader('jquery/jquery-1.8.3.js')
, this.dataLoader('jquery/jquery-ui-1.9.2.custom.js')
, this.dataLoader('injected/injected.css')
, this.dataLoader('injected/prelude.js')
, this.dataLoader('injected/ui.js')
, this.dataLoader('injected/jquery-plugins.js')
];
this.loadScripts(tabId, uiScripts, false, data);
}
};
/**
* Updates the widget according to the tab state of the specified tab.
*
* @param {!number} tabId Id of the tab that is currently active, and
* thus, dictating the widget display.
*/
fiveui.Background.prototype.activate = function(tabId) {
var tabState = this.state.getTabState(tabId);
this.updateWidget(tabState);
};
/**
* Stop tracking the state of a tab.
*
* @param {!number} tabId Id of the tab to free the state of.
*/
fiveui.Background.prototype.removeTab = function(tabId) {
this.state.removeTabState(tabId);
};
/**
* Request that the user interface be restored, if it is closed.
*/
fiveui.Background.prototype.showUI = function(tabId) {
var tabState = this.state.getTabState(tabId);
if(null == tabState) {
return;
}
if(tabState.winState.closed) {
tabState.winState.closed = false;
tabState.uiPort.emit('ShowUI', null);
}
};
})();
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