<?php
/**
 * Stream driver performs external requests using php
 * sockets.
 *
 * This is the default driver for all external requests.
 *
 * @package        KO7\Request
 *
 * @copyright  (c) 2007-2016  Kohana Team
 * @copyright  (c) since 2016 Koseven Team
 * @license        https://koseven.dev/LICENSE
 *
 */
class KO7_Request_Client_Stream extends Request_Client_External {

	/**
	 * Sends the HTTP message [Request] to a remote server and processes
	 * the response.
	 *
	 * @param Request  $request  request to send
	 * @param Response $response response to send
	 *
	 * @throws Request_Exception
	 *
	 * @return  Response
	 */
	public function _send_message(Request $request, Response $response): Response
	{
		// Calculate stream mode
		$mode = ($request->method() === HTTP_Request::GET) ? 'r' : 'r+';

		// Process cookies
		if ($cookies = $request->cookie())
		{
			$request->headers('cookie', http_build_query($cookies, NULL, '; '));
		}

		// Get the message body
		$body = $request->body();

		// Set the content length and form-urlencoded
		if ($body)
		{
			$request->headers('content-length', (string)strlen($body));
			$request->headers('content-type', 'application/x-www-form-urlencoded');
		}

		[$protocol] = explode('/', $request->protocol());

		// Create the context
		$options = [
			strtolower($protocol) => [
				'method' => $request->method(),
				'header' => (string)$request->headers(),
				'content' => $body
			]
		];

		// Create the context stream
		$context = stream_context_create($options);

		// Set options
		if (!empty($this->_options))
		{
			stream_context_set_option($context, $this->_options);
		}

		$uri = $request->uri();

		if ($query = $request->query())
		{
			$uri .= '?' . http_build_query($query, NULL, '&');
		}

		// Throws an Exception if you try to write smth. but requested stream is not write-able or unavailable
		try
		{
			//Suppress warning: failed to open stream: HTTP wrapper does not support writeable connections
			if (is_resource($context) && get_resource_type($context) === 'stream-context' && $mode === 'r+') {
				throw new Request_Exception('Failed to open stream: HTTP wrapper does not support writeable connections: '.$uri);
			}
			$stream = fopen($uri, $mode, FALSE, $context);
		}
		catch(Exception $e)
		{
			throw new Request_Exception($e->getMessage());
		}
		if (is_resource($stream)) {
			$meta_data = stream_get_meta_data($stream);

			// Get the HTTP response code
			$http_response = array_shift($meta_data['wrapper_data']);

			// Fetch respone protocol and status
			preg_match_all('/(\w+\/\d\.\d) (\d{3})/', $http_response, $matches);

			$protocol = $matches[1][0];
			$status = (int)$matches[2][0];

			// Get any existing response headers
			$response_header = $response->headers();

			// Process headers
			array_map([$response_header, 'parse_header_string'], [], $meta_data['wrapper_data']);

			// Build the response
			$response->status($status)->protocol($protocol)->body(stream_get_contents($stream));

			// Close the stream after use
			fclose($stream);

			return $response;
		} else {
			throw new Request_Exception('Request stream could not be opened: '.$request->method() .' '.$request->uri());
		}
	}

}