irker.php

<?php
	Header( 'Content-Type: text/plain; charset=utf-8' );
	
	// Don't do this in production!
	ini_set( 'error_reporting', -1 );
	ini_set( 'display_errors', 1 );
	
	http_response_code( 500 );
	
	require __DIR__ . '/config.php';
	require __DIR__ . '/GitHub_WebHook.php';
	require __DIR__ . '/GitHub_IRC.php';
	
	$Socket = false;
	$Hook = new GitHub_WebHook( );
	
	try
	{
		// This check is optional, you can implement some secret GET param for example
		if( !$Hook->ValidateIPAddress() )
		{
			throw new Exception( 'Unauthorized.' );
		}
		
		$Hook->ProcessRequest( );
		
		$RepositoryName = $Hook->GetFullRepositoryName();
		
		echo 'Received ' . $Hook->GetEventType() . ' in repository ' . $RepositoryName . PHP_EOL;
		//print_r( $Hook->GetPayload() );
		
		// Format IRC message
		$IRC = new GitHub_IRC( $Hook->GetEventType(), $Hook->GetPayload(), 'shorten_url' );
		$Message = $IRC->GetMessage();
		
		if( isset( $_GET[ 'strip_colors' ] ) )
		{
			$Message = strip_colors( $Message );
		}
		
		if( empty( $Message ) )
		{
			throw new Exception( 'Empty message, not sending.' );
		}
		
		// Format irker payload
		$IrkerPayload = '';
		
		foreach( $Channels as $Channel => $SendTargets )
		{
			if( !wild( $RepositoryName, $Channel ) )
			{
				continue;
			}
			
			echo 'Matched "' . $RepositoryName . '" as "' . $Channel . '"' . PHP_EOL; 
			
			foreach( $SendTargets as $Target )
			{
				$IrkerPayload .= json_encode( Array(
					'to'      => $Target,
					'privmsg' => $Message
				) ) . "\n";
			}
		}
		
		if( empty( $IrkerPayload ) )
		{
			throw new Exception( 'Empty payload, not sending.' );
		}
		
		// Send to irker
		$Socket = socket_create( AF_INET, SOCK_STREAM, SOL_TCP );
		
		if( $Socket === false
		|| socket_connect( $Socket, IRKER_HOST, IRKER_PORT ) === false
		|| socket_write( $Socket, $IrkerPayload ) === false )
		{
			throw new Exception( 'Socket error: ' . socket_strerror( socket_last_error() ) );
		}
		
		echo 'Payload sent to irker' . PHP_EOL . $IrkerPayload . PHP_EOL;
		
		http_response_code( 202 );
	}
	catch( GitHubIgnoredEventException $e )
	{
		http_response_code( 200 );
		
		echo 'This GitHub event is ignored.';
	}
	catch( GitHubNotImplementedException $e )
	{
		http_response_code( 501 );
		
		echo 'Unsupported GitHub event: ' . $e->EventName;
	}
	catch( Exception $e )
	{
		echo 'Exception: ' . $e->getMessage() . PHP_EOL;
	}
	
	// Cleanup
	if( $Socket !== false )
	{
		socket_close( $Socket );
	}
	
	function wild( $string, $expression )
	{
		if( strpos( $expression, '*' ) === false )
		{
			return strcmp( $expression, $string ) === 0;
		}
		
		$expression = preg_quote( $expression, '/' );
		$expression = str_replace( '\*', '.*', $expression );
		
		return preg_match( '/^' . $expression . '$/', $string ) === 1;
	}
	
	function strip_colors( $message )
	{
		return preg_replace( "/\x03(\d\d)?/", '', $message );
	}
	
	function shorten_url( $url )
	{
		$c = curl_init( );
		
		curl_setopt_array( $c, [
			CURLOPT_USERAGENT      => 'https://github.com/xPaw/GitHub-WebHook',
			CURLOPT_HEADER         => true,
			CURLOPT_RETURNTRANSFER => true,
			CURLOPT_FOLLOWLOCATION => false,
			CURLOPT_URL            => 'https://git.io',
			CURLOPT_CONNECTTIMEOUT => 5,
			CURLOPT_TIMEOUT        => 5,
			CURLOPT_POST           => 1,
			CURLOPT_POSTFIELDS     => http_build_query( [ 'url' => $url ] )
		] );
		
		$response = curl_exec( $c );
		
		curl_close( $c );
		
		if( $response !== false )
		{
			$response = explode( "\r\n", $response );
			$key = 'Location: ';
			
			foreach( $response as $header )
			{
				if( strpos( $header, $key ) === 0 )
				{
					return substr( $header, strlen( $key ) );
				}
			}
		}
		
		return $url;
	}