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echo_server.js
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echo_server.js
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var WebSocketServer = require('ws').Server;
function EchoServer ( options ) {
this.history = []; // Array with all entered characters
this.wss = new WebSocketServer( options ); // Initialize WebSocket.Server
this.full_message = ''; // Store the full message string
this.last_10secs = ''; // Store the last ten minutes message string
this.color_regex = /#(?:[a-f\d]{6}|[a-f\d]{3})|rgb\((?:(?:\s*\d+\s*,){2}\s*\d+|(?:\s*\d+(?:\.\d+)?%\s*,){2}\s*\d+(?:\.\d+)?%)\s*\)|rgba\((?:(?:\s*\d+\s*,){3}|(?:\s*\d+(?:\.\d+)?%\s*,){3})\s*\d+(?:\.\d+)?\s*\)|transparent|aliceblue|antiquewhite|aquamarine|aqua|azure|beige|bisque|black|blanchedalmond|blueviolet|blue|brown|burlywood5|cadetblue|chartreuse|chocolate|coral|cornflowerblue|cornsilk|crimson|cyan|darkblue|darkcyan|darkgoldenrod|darkgray|darkgreen|darkgrey|darkkhaki|darkmagenta|darkolivegreen|darkorange|darkorchid|darkred|darksalmon|darkseagreen|darkslateblue|darkslategray|darkslategrey|darkturquoise|darkviolet|deeppink|deepskyblue|dimgray|dimgrey|dodgerblue|firebrick|floralwhite|forestgreen|fuchsia|gainsboro|ghostwhite|goldenrod|gold|gray|greenyellow|green|grey|honeydew|hotpink|indianred|indigo|ivory|khaki|lavender|lavenderblush|lawngreen|lemonchiffon|lightblue|lightcoral|lightcyan|lightgoldenrodyellow|lightgray|lightgreen|lightgrey|lightpink|lightsalmon|lightseagreen|lightskyblue|lightslategray|lightslategrey|lightsteelblue|lightyellow|limegreen|lime|linen|magenta|maroon|mediumaquamarine|mediumblue|mediumorchid|mediumpurple|mediumseagreen|mediumslateblue|mediumspringgreen|mediumturquoise|mediumvioletred|midnightblue|mintcream|mistyrose|moccasin|navajowhite|navy|oldlace|olivedrab|olive|orangered|orange|orchid|palegoldenrod|palegreen|paleturquoise|palevioletred|papayawhip|peachpuff|peru|pink|plum|powderblue|purple|red|rosybrown|royalblue|saddlebrown|salmon|sandybrown|seagreen|seashell|sienna|silver|skyblue|slateblue|slategray|slategrey|snow|springgreen|steelblue|tan|teal|thistle|tomato|turquoise|violet|wheat|whitesmoke|white|yellowgreen|yellow/gi;
this.wss.on( 'connection', this.initConnection.bind( this ) );
}
EchoServer.prototype = {
// Initialize a new client connection
initConnection : function ( ws ) {
var data = {
string : this.full_message,
cmd : null
};
// Send the current string on every new connection
if ( this.history.length ) {
ws.send( JSON.stringify( data ) );
}
ws.on( 'message', this.onMessage.bind( this ) );
},
// Handles the WebSockets 'message' event.
// Executes when a new message from the client is received.
onMessage : function ( message ) {
this.history.push({
timestamp : Date.now(),
char : message
});
this.full_message = this.generateMessage();
this.last_10secs = this.getLast10Secs();
var data = {
string : this.full_message,
cmd : {
background : this.checkColor()
}
};
// Broadcast the message to all connected to the WebSocket clients
this.wss.clients.forEach( function ( client ) {
client.send( JSON.stringify( data ) );
});
},
// Returns a string with all entered characters at this time
generateMessage : function ( array ) {
array = array || this.history;
return array.map( message => message.char ).join(''); // ES6 style yeah
},
// Return a string that contains the entered in the last 10 seconds characters
getLast10Secs : function () {
// Get only the characters that has been enetered in the last 10 seconds
// and generate string from them
return this.generateMessage(
this.history.filter(
elem => ( elem.timestamp >= Date.now() - 10000 )
)
);
},
// Check if the characters entered in the last 10 seconds contains a valid
// color name, color HEX value or color rgb(a) value
checkColor : function () {
var match = this.last_10secs.match( this.color_regex );
return match ? match.pop() : null;
}
};
module.exports = EchoServer;