upload_socket.php

<?php

App::import('Core', array('Media', 'HttpSocket'));

class UploadSocket extends HttpSocket {	

	/**
	 * upload function
	 * allows posting of multipart form data (aka file uploads)
	 *
	 * @return result string
	 * @author Matt Weg
	 * @param mixed $uri standard HttpSocket uri, like in post() or get()
	 * @param array $files keyed paths to files to be posted, can be local or http path, like array('data[Model][upload]'=>'/path/to/file.ext')
	 * @param array $data keyed form data to be posted, must be only one demension, like array('data[Model][field]'=>'value')
	 * 
	 **/
	function upload($uri, $files, $data = array() ) {
		
		// The boundary string is used to identify the different parts of a
	    // multipart http request
	    $boundaryString = String::uuid();
	
		// building the form and file data into the body of the request
		$body = "--$boundaryString\r\n";

		//regular form data is prepared for posting
		foreach($data as $name=>$value) {
			$body.= "Content-Disposition: form-data; name=\"{$name}\"\r\n";
		    $body.= "\r\n";
			$body.= "{$value}\r\n";
			$body .= "--$boundaryString\r\n";
		}
	
		//getting availble Content-Type from cake's MediaView
		$media = new MediaView();
	
		//file data is prepared for posting
		foreach($files as $name=>$path) {
			
			$path_parts = pathinfo($path);
			if(empty($path_parts['basename'])) break;
			
			if(!empty($media->mimeType[$path_parts['extension']])) {
				$mimeType = $media->mimeType[$path_parts['extension']];
			} else {
				$mimeType = 'text/plain';
			}
			
			$body.= "Content-Disposition: form-data; name=\"{$name}\"; filename=\"{$path_parts['basename']}\"\r\n";
			$body.= "Content-Type: {$mimeType}\r\n";
			
			if(!strstr($mimeType,'text')) {
				$body.= "Content-Transfer-Encoding: binary\r\n";
			}
			
			$body.= "\r\n";
			$body.= @file_get_contents($path)."\r\n";
			$body.= "--$boundaryString\r\n";
		}
	
		//manually building the request to HttpSocket
		$request = array(
		'method'=>'POST',
		'uri'=>$uri,
	      'header' => array(
	        'Content-Type' => 'multipart/form-data; boundary="' . $boundaryString . '"',
	      ),
	      'body' => $body,
	    );
	
		return $this->request($request);
	}
	
}

?>