/*

Copyright 2008-2011 Clipperz Srl

This file is part of Clipperz's Javascript Crypto Library.
Javascript Crypto Library provides web developers with an extensive
and efficient set of cryptographic functions. The library aims to
obtain maximum execution speed while preserving modularity and
reusability.
For further information about its features and functionalities please
refer to http://www.clipperz.com

* Javascript Crypto Library is free software: you can redistribute
  it and/or modify it under the terms of the GNU Affero General Public
  License as published by the Free Software Foundation, either version
  3 of the License, or (at your option) any later version.

* Javascript Crypto Library is distributed in the hope that it will
  be useful, but WITHOUT ANY WARRANTY; without even the implied
  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Affero General Public License for more details.

* You should have received a copy of the GNU Affero General Public
  License along with Javascript Crypto Library.  If not, see
  <http://www.gnu.org/licenses/>.

*/

if (typeof(Clipperz) == 'undefined') { Clipperz = {}; }
if (typeof(Clipperz.PM) == 'undefined') { Clipperz.PM = {}; }

//-----------------------------------------------------------------------------
//
//		Abstract   C O N N E C T I O N   class
//
//-----------------------------------------------------------------------------

Clipperz.PM.Connection = function (args) {
	args = args || {};

	this._user = args.user;
	this._clipperz_pm_crypto_version = null;
	this._connectionId = null;
	this._oneTimePassword = null;
	
	return this;
}

Clipperz.PM.Connection.prototype = MochiKit.Base.update(null, {

	'user': function() {
		return this._user;
	},
	
	'toString': function() {
		return "Connection [" + this.version() + "] - user: " + this.user();
	},
	
	//=========================================================================

	'version': function() {
		throw Clipperz.Base.exception.AbstractMethod;
	},
	
	'clipperz_pm_crypto_version': function() {
		if (this._clipperz_pm_crypto_version == null) {
			var connectionVersions;
			var	versions;
			var	version;
			var i, c;

			version = null;
			connectionVersions = Clipperz.PM.Crypto.communicationProtocol.versions;
			versions = MochiKit.Base.keys(connectionVersions);
			c = versions.length;
			for (i=0; i<c; i++) {
				if (! (versions[i] == 'current')) {
					if (this instanceof connectionVersions[versions[i]]) {
						version = versions[i];
					};
				}
			}
			
			this._clipperz_pm_crypto_version = version;
		}
		
		return this._clipperz_pm_crypto_version;
	},

	//-------------------------------------------------------------------------

	'defaultErrorHandler': function(anErrorString, anException) {
MochiKit.Logging.logError("### Connection.defaultErrorHandler: " + anErrorString + " (" + anException + ")");
	},
	
	//-------------------------------------------------------------------------

	'login': function(someArguments, aCallback) {
		throw Clipperz.Base.exception.AbstractMethod;
	},

	//-------------------------------------------------------------------------

	'message': function(someArguments, aCallback) {
		throw Clipperz.Base.exception.AbstractMethod;
	},

	//-------------------------------------------------------------------------

	'sharedSecret': function() {
		throw Clipperz.Base.exception.AbstractMethod;
	},

	'serverSideUserCredentials': function() {
		throw Clipperz.Base.exception.AbstractMethod;
	},

	//=========================================================================

	'connectionId': function() {
		return this._connectionId;
	},
	
	'setConnectionId': function(aValue) {
		this._connectionId = aValue;
	},

	//=========================================================================

	'oneTimePassword': function() {
		return this._oneTimePassword;
	},
	
	'setOneTimePassword': function(aValue) {
		this._oneTimePassword = aValue;
	},
	
	//=========================================================================
	__syntaxFix__: "syntax fix"

}
);


if (typeof(Clipperz.PM.Connection.SRP) == 'undefined') { Clipperz.PM.Connection.SRP = {}; }
//-----------------------------------------------------------------------------
//
//		S R P [ 1 . 0 ]    C O N N E C T I O N   class
//
//-----------------------------------------------------------------------------

Clipperz.PM.Connection.SRP['1.0'] = function (args) {
	args = args || {};
	Clipperz.PM.Connection.call(this, args);
	
	this._C = null;
	this._P = null;
	this._srpConnection = null;
	
	return this;
}

Clipperz.PM.Connection.SRP['1.0'].prototype = MochiKit.Base.update(new Clipperz.PM.Connection(), {

	'version': function() {
		return '1.0';
	},

	//=========================================================================
	
	'register': function(anInvitationCode) {
		var deferredResult;
		var	parameters;

//MochiKit.Logging.logError(">>> Connection.register: " + this);
		parameters = {};
		deferredResult = new MochiKit.Async.Deferred();
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.register - 1: " + res); return res;});
		deferredResult.addCallback(Clipperz.NotificationCenter.deferredNotification, this, 'updatedProgressState', 'registration_verify');
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.register - 2: " + res); return res;});
		deferredResult.addCallback(function(aConnection, anInvitationCode) {
			var args;
			
			args = {};
			args.message = 'register';
			args.version = aConnection.clipperz_pm_crypto_version();
			args.invitationCode = anInvitationCode;
			
			return args;
		}, this);
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.register - 3: " + res); return res;});
		deferredResult.addCallback(Clipperz.NotificationCenter.deferredNotification, this, 'updatedProgressState', 'registration_sendingCredentials');
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.register - 4: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(this.user(), 'encryptedData'));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.register - 5: " + res); return res;});
		deferredResult.addCallback(function(someParameters, anUser, anEncryptedData) {
			var currentVersionConnection;
			var args;

			currentVersionConnection = new Clipperz.PM.Crypto.communicationProtocol.versions['current']({user:anUser});
			
			args = someParameters
			args.credentials = currentVersionConnection.serverSideUserCredentials();
			args.user = anEncryptedData;
			args.version = args.credentials.version;
			args.message = "completeRegistration";

			return args;
		}, parameters, this.user());
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.register - 6: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(Clipperz.PM.Proxy.defaultProxy, 'registration'));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.register - 7: " + Clipperz.Base.serializeJSON(res)); return res;});
		deferredResult.addCallback(MochiKit.Base.bind(function(res) {
			this.user().setLock(res['lock']);

			return res;
		}, this));
		deferredResult.callback(anInvitationCode);
//MochiKit.Logging.logError("<<< Connection.register");
		
		return deferredResult;
	},

	//=========================================================================

	'login': function(isReconnecting) {
		var	deferredResult;
		
//MochiKit.Logging.logDebug(">>> Connection.login: "/* + this*/);
//MochiKit.Logging.logDebug("--- Connection.login - isReconnecting: " + (isReconnecting == true));
		deferredResult = new MochiKit.Async.Deferred();
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.1 - Connection.login - 1: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
		deferredResult.addCallback(Clipperz.NotificationCenter.deferredNotification, this, 'updatedProgressState', 'connection_sendingCredentials');
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.2 - Connection.login - 2: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
		deferredResult.addCallback(function(aConnection) {
			var args;
			
			args = {};
			args.message = 'connect';
			args.version = aConnection.clipperz_pm_crypto_version();
			args.parameters = {};
//MochiKit.Logging.logDebug("=== Connection.login - username: " + aConnection.srpConnection().C());
			args.parameters['C'] = aConnection.srpConnection().C();
			args.parameters['A'] = aConnection.srpConnection().A().asString(16);
			
			if (isReconnecting == true) {
//MochiKit.Logging.logDebug("--- Connection.login - reconnecting");
//#				args.parameters['reconnecting'] = "yes";
				args.parameters['reconnecting'] = aConnection.connectionId();
			}
//MochiKit.Logging.logDebug("--- Connection.login - args: " + Clipperz.Base.serializeJSON(args));
//MochiKit.Logging.logDebug("--- Connection.login - srp.a: " + aConnection.srpConnection().a().asString(16));

			return args;
		});
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.3 - Connection.login - 3: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(Clipperz.PM.Proxy.defaultProxy, 'handshake'));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.4 - Connection.login - 4: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
		deferredResult.addCallback(Clipperz.NotificationCenter.deferredNotification, this, 'updatedProgressState', 'connection_credentialVerification');
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.5 - Connection.login - 5: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
deferredResult.addErrback(MochiKit.Base.bind(function(res) {MochiKit.Logging.logDebug("ERROR - c: " + this.srpConnection().C() + " # version: " + this.clipperz_pm_crypto_version()); return res;}, this));
		deferredResult.addCallback(MochiKit.Base.bind(function(someParameters) {
			var args;

			this.srpConnection().set_s(new Clipperz.Crypto.BigInt(someParameters['s'], 16));
			this.srpConnection().set_B(new Clipperz.Crypto.BigInt(someParameters['B'], 16));

			if (typeof(someParameters['oneTimePassword']) != 'undefined') {
				this.setOneTimePassword(someParameters['oneTimePassword']);
			}
			
			args = {};
			args.message = 'credentialCheck';
			args.version = this.clipperz_pm_crypto_version();
			args.parameters = {};
			args.parameters['M1'] = this.srpConnection().M1();

			return args;
		}, this));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.6 - Connection.login - 6: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(Clipperz.PM.Proxy.defaultProxy, 'handshake'));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.7 - Connection.login - 7: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
//#		deferredResult.addCallback(MochiKit.Base.method(this, 'loginDone'));
		deferredResult.addCallback(MochiKit.Base.bind(function(someParameters) {
			var result;
		
//MochiKit.Logging.logDebug(">>> Connection.loginDone: " + this + " (M2: " + this.srpConnection().M2() + ")");
			if (someParameters['M2'] == this.srpConnection().M2()) {
				result = new MochiKit.Async.Deferred();
				
//MochiKit.Logging.logDebug("--- Connection.loginDone - someParameters: " + Clipperz.Base.serializeJSON(someParameters));
				this.setConnectionId(someParameters['connectionId']);
				this.user().setLoginInfo(someParameters['loginInfo']);
				this.user().setShouldDownloadOfflineCopy(someParameters['offlineCopyNeeded']);
				this.user().setLock(someParameters['lock']);
			
				if (this.oneTimePassword() != null) {
					result.addCallback(MochiKit.Base.method(this.user().oneTimePasswordManager(), 'archiveOneTimePassword', this.oneTimePassword()));
				}
				result.addCallback(Clipperz.NotificationCenter.deferredNotification, this, 'updatedProgressState', 'connection_loggedIn');
				result.addCallback(MochiKit.Async.succeed, someParameters);
				
				result.callback();
//MochiKit.Logging.logDebug("--- Connection.loginDone - 1 - result: "/* + Clipperz.Base.serializeJSON(result)*/);
			} else {
//MochiKit.Logging.logDebug("--- Connection.loginDone - 2 - ERROR");
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
				result = MochiKit.Async.fail(Clipperz.PM.Connection.exception.WrongChecksum);
			}
//MochiKit.Logging.logDebug("<<< Connection.loginDone - result: " + Clipperz.Base.serializeJSON(result));

			return result;
		}, this));

//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.3.8 - Connection.login - 8: "/* + res*/); return res;});
//deferredResult.addErrback(function(res) {MochiKit.Logging.logDebug("ERROR: " + res); return res;});
		deferredResult.callback(this);
//MochiKit.Logging.logDebug("<<< Connection.login");
		
		return deferredResult;
	},

	//=========================================================================

	'logout': function() {
		var deferredResult;

//MochiKit.Logging.logDebug(">>> Connection.logout: " + this);
		deferredResult = new MochiKit.Async.Deferred();
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.logout - 1: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(Clipperz.PM.Proxy.defaultProxy, 'logout'), {});
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.logout - 2: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(this, 'resetSrpConnection'));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.logout - 3: " + res); return res;});
		deferredResult.callback();
//MochiKit.Logging.logDebug("<<< Connection.logout");
		
		return deferredResult;
	},
	
	//=========================================================================

	'message': function(aMessageName, someParameters) {
		var args;
		var deferredResult;
		
//MochiKit.Logging.logDebug(">>> Connection.message: " + this);
		args = {}
		args['message'] = aMessageName;
		args['srpSharedSecret'] = this.srpConnection().K();
//		args['lock'] = this.user().lock();

		if (someParameters != null) {
			args['parameters'] = someParameters;
		} else {
			args['parameters'] = {};
		} 
//MochiKit.Logging.logDebug("--- Connection.message - args: " + Clipperz.Base.serializeJSON(args));

//		deferredResult = new MochiKit.Async.Deferred();		//	### ?????????????
		
		return this.sendMessage(args);
	},

	//-------------------------------------------------------------------------

	'sendMessage': function(someArguments) {
		var	deferredResult;
		
//MochiKit.Logging.logDebug(">>> Connection.sendMessage: " + this);
		deferredResult = new MochiKit.Async.Deferred();
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.sendMessage - 1: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(Clipperz.PM.Proxy.defaultProxy, 'message'), someArguments);
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.sendMessage - 2: " + res); return res;});

		deferredResult.addCallback(MochiKit.Base.bind(function(res) {
			if (typeof(res['lock']) != 'undefined') {
				this.user().setLock(res['lock']);
			}
			return res;
		}, this));

		deferredResult.addErrback(MochiKit.Base.method(this, 'messageExceptionHandler'), someArguments);
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.sendMessage - 3: " + res); return res;});
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.sendMessage - 3: " + Clipperz.Base.serializeJSON(res)); return res;});
		deferredResult.callback();
//MochiKit.Logging.logDebug("<<< Connection.sendMessage");
		
		return deferredResult
	},
	
	//-------------------------------------------------------------------------

	'messageExceptionHandler': function(anOriginalMessageArguments, anError) {
		var result;

//MochiKit.Logging.logDebug(">>> Connection.messageExceptionHandler - this: " + this + ", anError: " + anError);
		if (anError instanceof MochiKit.Async.CancelledError) {
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 1");
			result = anError;
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 2");
		} else {
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 3 - anError.name: " + anError.name + ", message: " + anError.message);
			if ((anError.message == 'Trying to communicate without an active connection')	||
				(anError.message == 'No tollManager available for current session')		
			) {
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 4");
				result = this.reestablishConnection(anOriginalMessageArguments);
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 5");
			} else if (anError.message == 'Session with stale data') {
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 5.1");
				Clipperz.NotificationCenter.notify(this, 'EXCEPTION');
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 5.2");
			} else {
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 6");
				result = anError;
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 7");
			}
//MochiKit.Logging.logDebug("--- Connection.messageExceptionHandler - 8");
		}
//MochiKit.Logging.logDebug("<<< Connection.messageExceptionHandler");
		
		return result;;
	},
	
	//=========================================================================

	'reestablishConnection': function(anOriginalMessageArguments) {
		var deferredResult;

//MochiKit.Logging.logDebug("+++ Connection.reestablishConnection: " + Clipperz.Base.serializeJSON(anOriginalMessageArguments));

//MochiKit.Logging.logDebug(">>> Connection.reestablishConnection: " + this);
		deferredResult = new MochiKit.Async.Deferred();
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.reestablishConnection 1: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(this, 'resetSrpConnection'));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.reestablishConnection 2: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.method(this, 'login'), true);
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.reestablishConnection 3: " + res); return res;});
		deferredResult.addCallback(MochiKit.Base.bind(function(aMessage) {
			aMessage['srpSharedSecret'] = this.srpConnection().K();
			return aMessage;
		}, this), anOriginalMessageArguments);
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.reestablishConnection 4: " + Clipperz.Base.serializeJSON(res)); return res;});
		deferredResult.addCallback(MochiKit.Base.method(this, 'sendMessage'));
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.reestablishConnection 5: " + res); return res;});
		deferredResult.addErrback(Clipperz.NotificationCenter.deferredNotification, this, 'EXCEPTION', null);
//deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("Connection.reestablishConnection 6: " + res); return res;});
		deferredResult.callback();
//MochiKit.Logging.logDebug("<<< Connection.reestablishConnection");

		return deferredResult;
	},

	//=========================================================================

	'sharedSecret': function() {
		return this.srpConnection().K();
	},

	//=========================================================================

	'serverSideUserCredentials': function() {
		var	result;
		var	newSrpConnection;

//MochiKit.Logging.logDebug(">>> Connection.serverSideUserCredentials");
		newSrpConnection = new Clipperz.Crypto.SRP.Connection({ C:this.C(), P:this.P(), hash:this.hash() });
		result = newSrpConnection.serverSideCredentials();
		result['version'] = this.clipperz_pm_crypto_version();

//MochiKit.Logging.logDebug("<<< Connection.serverSideUserCredentials - result: " + Clipperz.Base.serializeJSON(result));
		return result;
	},

	//=========================================================================

	'C': function() {
		if (this._C == null) {
			this._C = this.hash()(new Clipperz.ByteArray(this.user().username())).toHexString().substring(2);
		}
		
		return this._C;
	},

	//-----------------------------------------------------------------------------

	'P': function() {
		if (this._P == null) {
			this._P = this.hash()(new Clipperz.ByteArray(this.user().passphrase() + this.user().username())).toHexString().substring(2);
		}
		
		return this._P;
	},

	//-----------------------------------------------------------------------------

	'hash': function() {
		return Clipperz.PM.Crypto.encryptingFunctions.versions['0.1'].hash;
	},
	
	//-----------------------------------------------------------------------------

	'srpConnection': function() {
		if (this._srpConnection == null) {
			this._srpConnection = new Clipperz.Crypto.SRP.Connection({ C:this.C(), P:this.P(), hash:this.hash() });
		}
		
		return this._srpConnection;
	},
	
	'resetSrpConnection': function() {
		this._C = null;
		this._P = null;
		this._srpConnection = null;
	},
	
	//-----------------------------------------------------------------------------
	__syntaxFix__: "syntax fix"

});



//-----------------------------------------------------------------------------
//
//		S R P [ 1 . 1 ]    C O N N E C T I O N   class
//
//-----------------------------------------------------------------------------

Clipperz.PM.Connection.SRP['1.1'] = function (args) {
	args = args || {};
	Clipperz.PM.Connection.SRP['1.0'].call(this, args);
	
	return this;
}

Clipperz.PM.Connection.SRP['1.1'].prototype = MochiKit.Base.update(new Clipperz.PM.Connection.SRP['1.0'](), {

	'version': function() {
		return '1.1';
	},

	//-----------------------------------------------------------------------------

	'C': function() {
		if (this._C == null) {
			this._C = this.hash()(new Clipperz.ByteArray(this.user().username() + this.user().passphrase())).toHexString().substring(2);
		}
		
		return this._C;
	},

	//-----------------------------------------------------------------------------

	'P': function() {
		if (this._P == null) {
			this._P = this.hash()(new Clipperz.ByteArray(this.user().passphrase() + this.user().username())).toHexString().substring(2);
		}
		
		return this._P;
	},
	
	//-----------------------------------------------------------------------------

	'hash': function() {
		return Clipperz.PM.Crypto.encryptingFunctions.versions['0.2'].hash;
	},

	//-----------------------------------------------------------------------------
	__syntaxFix__: "syntax fix"

});

Clipperz.PM.Connection.exception = {
	WrongChecksum: new MochiKit.Base.NamedError("Clipperz.ByteArray.exception.InvalidValue")
};