bot.js

//(function () {
var input = {
	//change the following to whatever you want
	pattern : 'ie>',
	cb : null,

	init : function () {
		var self = this;
		$.post( '/ws-auth', fkey({roomid:17}), finish );

		function finish ( resp ) {
			self.openSocket( resp.url );
		}
	},
	openSocket : function ( url ) {
		var socket = this.socket = new WebSocket( url + '?l=9999999999999' );

		socket.onmessage = this.onmessage.bind( this );
	},

	onmessage : function ( data ) {
		if ( !data ) {
			return;
		}

		var self = this,
			resp = JSON.parse( data.data );

		Object.keys( resp ).forEach(function ( room ) {
			var msgObj = resp[ room ];
			if ( msgObj.e ) {
				msgObj.e.forEach( self.handleMessage, self );
			}
		});
	},
	handleMessage : function ( message ) {
		message.content = decodeHtmlEntities( message.content );
		console.log( message );

		if ( this.acceptMessage(message) ) {
			this.cb && this.cb( message );
		}
		else {
			console.log( 'not accepting' );
		}
	},

	acceptMessage : function ( message ) {
		var et = message.event_type;
		//et = 1  => new message
		//et = 2  => edited message
		return ( et === 1 || et === 2 ) &&
			message.content.indexOf(this.pattern) === 0;
	}
};
var output = {
	send : function ( text, room ) {
		var pr = $.post(
			'/chats/' + room + '/messages/new',
			fkey({text : text})
		);
		pr.always( finish );

		function finish ( resp, _, jqXhr ) {
			var status = jqXhr.status;
			if ( status === 409 ) {
				//409 means throttling
				setTimeout(function () {
					output.send( text, room );
				}, 1000 );
			}
			else if ( status !== 200 ) {
				console.error( resp, status );
			}
		}
	}
};

//here's the bot itself, a flimsky callback
input.cb = function ( msg ) {
	console.log('got message', msg);

	var user = users[msg.user_id],
		res;
	if ( !legitUser(user) ) {
		res = 'Sorry buster, no eval for you!';
	}
	else {
		try {
			res = dressUpAnswer( eval(msg.content.replace(input.pattern, '')) );
		}
		catch ( e ) {
			res = e.toString();
		}
	}

	output.send( ':' + msg.message_id + ' ' + res, msg.room_id );
};

function dressUpAnswer ( answer ) {
	/*JSON does not like any of the following*/
	var strung = {
		Function  : true, Error  : true,
		Undefined : true, RegExp : true
	};
	var should_string = function ( value ) {
		var type = ( {} ).toString.call( value ).slice( 8, -1 );

		if ( type in strung ) {
			return true;
		}
		/*neither does it feel compassionate about NaN or Infinity*/
		return value !== value || value === Infinity;
	};

	var reviver = function ( key, value ) {
		var output;

		if ( should_string(value) ) {
			output = '' + value;
		}
		else {
			output = value;
		}

		return output;
	};

	return snipAndCodify( JSON.stringify(answer, reviver) );
}

function snipAndCodify ( str ) {
	if ( str.length < 400 ) {
		return '`' + str +'`';
	}

	return '`' +  str.slice(0, 400) + '` (snip)';
}

function legitUser ( user ) {
	return user &&
		user.is_owner ||
		user.is_moderator ||
		user.reputation > 2000;
}

var decodeHtmlEntities = (function (){
var entities = {"quot":"\"","amp":"&","apos":"'","lt":"<","gt":">","nbsp":" ","iexcl":"¡","cent":"¢","pound":"£","curren":"¤","yen":"¥","brvbar":"¦","sect":"§","uml":"¨","copy":"©","ordf":"ª","laquo":"«","not":"¬","reg":"®","macr":"¯","deg":"°","plusmn":"±","sup2":"²","sup3":"³","acute":"´","micro":"µ","para":"¶","middot":"·","cedil":"¸","sup1":"¹","ordm":"º","raquo":"»","frac14":"¼","frac12":"½","frac34":"¾","iquest":"¿","Agrave":"À","Aacute":"Á","Acirc":"Â","Atilde":"Ã","Auml":"Ä","Aring":"Å","AElig":"Æ","Ccedil":"Ç","Egrave":"È","Eacute":"É","Ecirc":"Ê","Euml":"Ë","Igrave":"Ì","Iacute":"Í","Icirc":"Î","Iuml":"Ï","ETH":"Ð","Ntilde":"Ñ","Ograve":"Ò","Oacute":"Ó","Ocirc":"Ô","Otilde":"Õ","Ouml":"Ö","times":"×","Oslash":"Ø","Ugrave":"Ù","Uacute":"Ú","Ucirc":"Û","Uuml":"Ü","Yacute":"Ý","THORN":"Þ","szlig":"ß","agrave":"à","aacute":"á","acirc":"â","atilde":"ã","auml":"ä","aring":"å","aelig":"æ","ccedil":"ç","egrave":"è","eacute":"é","ecirc":"ê","euml":"ë","igrave":"ì","iacute":"í","icirc":"î","iuml":"ï","eth":"ð","ntilde":"ñ","ograve":"ò","oacute":"ó","ocirc":"ô","otilde":"õ","ouml":"ö","divide":"÷","oslash":"ø","ugrave":"ù","uacute":"ú","ucirc":"û","uuml":"ü","yacute":"ý","thorn":"þ","yuml":"ÿ","OElig":"Œ","oelig":"œ","Scaron":"Š","scaron":"š","Yuml":"Ÿ","fnof":"ƒ","circ":"ˆ","tilde":"˜","Alpha":"Α","Beta":"Β","Gamma":"Γ","Delta":"Δ","Epsilon":"Ε","Zeta":"Ζ","Eta":"Η","Theta":"Θ","Iota":"Ι","Kappa":"Κ","Lambda":"Λ","Mu":"Μ","Nu":"Ν","Xi":"Ξ","Omicron":"Ο","Pi":"Π","Rho":"Ρ","Sigma":"Σ","Tau":"Τ","Upsilon":"Υ","Phi":"Φ","Chi":"Χ","Psi":"Ψ","Omega":"Ω","alpha":"α","beta":"β","gamma":"γ","delta":"δ","epsilon":"ε","zeta":"ζ","eta":"η","theta":"θ","iota":"ι","kappa":"κ","lambda":"λ","mu":"μ","nu":"ν","xi":"ξ","omicron":"ο","pi":"π","rho":"ρ","sigmaf":"ς","sigma":"σ","tau":"τ","upsilon":"υ","phi":"φ","chi":"χ","psi":"ψ","omega":"ω","thetasym":"ϑ","upsih":"ϒ","piv":"ϖ","ensp":" ","emsp":" ","thinsp":" ","ndash":"–","mdash":"—","lsquo":"‘","rsquo":"’","sbquo":"‚","ldquo":"“","rdquo":"”","bdquo":"„","dagger":"†","Dagger":"‡","bull":"•","hellip":"…","permil":"‰","prime":"′","Prime":"″","lsaquo":"‹","rsaquo":"›","oline":"‾","frasl":"⁄","euro":"€","image":"ℑ","weierp":"℘","real":"ℜ","trade":"™","alefsym":"ℵ","larr":"←","uarr":"↑","rarr":"→","darr":"↓","harr":"↔","crarr":"↵","lArr":"⇐","uArr":"⇑","rArr":"⇒","dArr":"⇓","hArr":"⇔","forall":"∀","part":"∂","exist":"∃","empty":"∅","nabla":"∇","isin":"∈","notin":"∉","ni":"∋","prod":"∏","sum":"∑","minus":"−","lowast":"∗","radic":"√","prop":"∝","infin":"∞","ang":"∠","and":"∧","or":"∨","cap":"∩","cup":"∪","int":"∫","there4":"∴","sim":"∼","cong":"≅","asymp":"≈","ne":"≠","equiv":"≡","le":"≤","ge":"≥","sub":"⊂","sup":"⊃","nsub":"⊄","sube":"⊆","supe":"⊇","oplus":"⊕","otimes":"⊗","perp":"⊥","sdot":"⋅","lceil":"⌈","rceil":"⌉","lfloor":"⌊","rfloor":"⌋","lang":"〈","rang":"〉","loz":"◊","spades":"♠","clubs":"♣","hearts":"♥","diams":"♦", "zwnj":""};


/*
  &       -all entities start with &
  (
   #      -charcode entities also have a #
   x?     -hex charcodes
  )?
  [\w;]   -now the entity (alphanumeric, separated by ;)
  +?      -capture em until there aint no more (don't get the trailing ;)
  ;       -trailing ;
*/
var entityRegex = /&(#x?)?[\w;]+?;/g;
var replaceEntities = function ( entities ) {
	//remove the & and split into each separate entity
	return entities.slice( 1 ).split( ';' ).map( decodeEntity ).join( '' );
};
var decodeEntity = function ( entity ) {
	if ( !entity ) {
		return '';
	}

	//starts with a #, it's charcode
	if ( entity[0] === '#' ) {
		return decodeCharcodeEntity( entity );
	}

	if ( !entities.hasOwnProperty(entity) ) {
		//I hate this so. so. so much. it's just wrong.
		return '&' + entity +';';
	}
	return entities[ entity ];
};
var decodeCharcodeEntity = function ( entity ) {
	//remove the # prefix
	entity = entity.slice( 1 );

	var cc;
	//hex entities
	if ( entity[0] === 'x' ) {
		cc = parseInt( entity.slice(1), 16 );
	}
	//decimal entities
	else {
		cc = parseInt( entity, 10 );
	}

	return String.fromCharCode( cc );
};

return function ( html ) {
	return html.replace( entityRegex, replaceEntities );
};
}());

//get the ball rolling
input.init();

//}());