Added Token Caching, v2.6.1

lib/TokenManager.js

@@ -0,0 +1,72 @@
+var fs = require( "fs" );
+var crypto = require( "crypto" );
+var md5 = require( "md5" );
+
+var tokens = {};
+
+exports.TokenManager = function( folder, file ) {
+
+	this.path = folder + file;
+
+	var self = this;
+
+	try {
+		var fd = fs.openSync( self.path, "wx" );
+		self.writeTokens();
+	} catch ( e ) {
+		if ( e.errno !== -4075 ) {
+			throw e;
+		} else {
+			self.readTokens();
+		}
+	}
+
+}
+
+exports.TokenManager.prototype.addToken = function( id, token, pass ) {
+	tokens[ md5( id ) ] = encrypt( token, pass );
+	this.writeTokens();
+}
+
+exports.TokenManager.prototype.readTokens = function() {
+	tokens = JSON.parse( fs.readFileSync( this.path, "utf8" ) );
+	for ( tkn in tokens ) {
+		tokens[ tkn ] = decrypt( tokens[ tkn ], tkn );
+	}
+}
+
+exports.TokenManager.prototype.writeTokens = function() {
+	var tkn = {};
+	for ( token in tokens ) {
+		tkn[ token ] = encrypt( tokens[ token ], token );
+	}
+	fs.writeFile( this.path, JSON.stringify( tkn ), function( err ) {
+
+	} );
+}
+
+exports.TokenManager.prototype.exists = function( id ) {
+	return tokens[ md5( id ) ];
+}
+
+exports.TokenManager.prototype.getToken = function( id, pass ) {
+    try{
+        return decrypt( tokens[ md5( id ) ], pass );
+    }catch(e){
+        return false;
+    }
+}
+
+function encrypt( string, password ) {
+	var cipher = crypto.createCipher( "aes-256-ctr", password )
+	var crypted = cipher.update( string, 'utf8', 'hex' )
+	crypted += cipher.final( 'hex' );
+	return crypted;
+}
+
+function decrypt( string, password ) {
+	var decipher = crypto.createDecipher( "aes-256-ctr", password )
+	var dec = decipher.update( string, 'hex', 'utf8' )
+	dec += decipher.final( 'utf8' );
+	return dec;
+}