<?php
/**
 * Various HTTP related functions
 */

/**
 * Get the contents of a file by HTTP
 * 
 * if $timeout is 'default', $wgHTTPTimeout is used
 */
function wfGetHTTP( $url, $timeout = 'default' ) {
	global $wgServer, $wgHTTPTimeout, $wgHTTPProxy;
	

	# Use curl if available
	if ( function_exists( 'curl_init' ) ) {
		$c = curl_init( $url );
		if ( wfIsLocalURL( $url ) ) {
			curl_setopt( $c, CURLOPT_PROXY, 'localhost:80' );
		} else if ($wgHTTPProxy)
			curl_setopt($c, CURLOPT_PROXY, $wgHTTPProxy);

		if ( $timeout == 'default' ) {
			$timeout = $wgHTTPTimeout;
		}
		curl_setopt( $c, CURLOPT_TIMEOUT, $timeout );
		ob_start();
		curl_exec( $c );
		$text = ob_get_contents();
		ob_end_clean();
		curl_close( $c );
	} else {
		# Otherwise use file_get_contents, or its compatibility function from GlobalFunctions.php
		# This may take 3 minutes to time out, and doesn't have local fetch capabilities
		$url_fopen = ini_set( 'allow_url_fopen', 1 );
		$text = file_get_contents( $url );
		ini_set( 'allow_url_fopen', $url_fopen );
	}
	return $text;
}

/**
 * Check if the URL can be served by localhost
 */
function wfIsLocalURL( $url ) {
	global $wgConf;
	// Extract host part
	if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
		$host = $matches[1];
		// Split up dotwise
		$domainParts = explode( '.', $host );
		// Check if this domain or any superdomain is listed in $wgConf as a local virtual host
		$domainParts = array_reverse( $domainParts );
		for ( $i = 0; $i < count( $domainParts ); $i++ ) {
			$domainPart = $domainParts[$i];
			if ( $i == 0 ) {
				$domain = $domainPart;
			} else {
				$domain = $domainPart . '.' . $domain;
			}
			if ( $wgConf->isLocalVHost( $domain ) ) {
				return true;
			}
		}
	}
	return false;
}

?>