lithium\net\socket\Curl

class

A Curl-based socket adapter

This curl adapter provides the required method implementations of the abstract Socket class for open, close, read, write, timeout eof and encoding.

Your PHP installation must have been compiled with the --with-curl[=DIR] directive. If this is not the case, you must either recompile PHP with the proper configuration flags to enable curl, or you may use the Stream adapter that is also included with the Lithium core.

Source

class Curl extends \lithium\net\Socket {

	/**
	 * Contains options that will be passed to `curl_setopt_array` before
	 * `read` and `write` operations. These options should be set by
	 * using the `set` method.
	 *
	 * @link http://php.net/function.curl-setopt.php PHP Manual: curl_setopt()
	 * @see lithium\net\socket\Curl::set()
	 * @var array
	 */
	public $options = [];

	/**
	 * Constructor.
	 *
	 * @param array $config
	 * @return void
	 */
	public function __construct(array $config = []) {
		$defaults = ['ignoreExpect' => true];
		parent::__construct($config + $defaults);
	}

	/**
	 * Opens a curl connection and initializes the internal resource handle.
	 *
	 * @param array $options update the config settings
	 *         if $options['options'] exists, will be passed to $this->set()
	 * @return mixed Returns `false` if the socket configuration does not contain the
	 *         `'scheme'` or `'host'` settings, or if configuration fails, otherwise returns a
	 *         resource stream.
	 */
	public function open(array $options = []) {
		$this->options = [];
		parent::open($options);
		$config = $this->_config;

		if (empty($config['scheme']) || empty($config['host'])) {
			return false;
		}
		if (!empty($config['options'])) {
			$this->set($config['options']);
		}

		$url = "{$config['scheme']}://{$config['host']}";
		$this->_resource = curl_init($url);
		$this->set([
			CURLOPT_PORT => $config['port'],
			CURLOPT_HEADER => true,
			CURLOPT_RETURNTRANSFER => true
		]);

		if (!is_resource($this->_resource)) {
			return false;
		}
		$this->_isConnected = true;
		$this->timeout($config['timeout']);

		if (isset($config['encoding'])) {
			$this->encoding($config['encoding']);
		}
		return $this->_resource;
	}

	/**
	 * Closes the curl connection.
	 *
	 * @return boolean True on closed connection
	 */
	public function close() {
		if (!is_resource($this->_resource)) {
			return true;
		}
		curl_close($this->_resource);
		return !is_resource($this->_resource);
	}

	/**
	 * EOF is unimplemented for this socket adapter.
	 *
	 * @return null
	 */
	public function eof() {
		return null;
	}

	/**
	 * Reads data from the curl connection.
	 * The `read` method will utilize the curl options that have been set.
	 *
	 * @link http://php.net/function.curl-exec.php PHP Manual: curl_exec()
	 * @return mixed Boolean false if the resource handle is unavailable, and the result
	 *         of `curl_exec` otherwise.
	 */
	public function read() {
		if (!is_resource($this->_resource)) {
			return false;
		}
		return curl_exec($this->_resource);
	}

	/**
	 * Writes data to curl options
	 *
	 * @param array|\lithium\net\Message $data
	 * @return boolean
	 */
	public function write($data = null) {
		if (!is_resource($this->_resource)) {
			return false;
		}
		if (!is_object($data)) {
			$data = Libraries::instance(
				null, 'request', (array) $data + $this->_config, $this->_classes
			);
		}
		$this->set(CURLOPT_URL, $data->to('url'));

		if ($data instanceof Message) {
			if (!empty($this->_config['ignoreExpect'])) {
				$data->headers('Expect', ' ');
			}
			if (isset($data->headers)) {
				$this->set(CURLOPT_HTTPHEADER, $data->headers());
			}
			if (isset($data->method) && $data->method === 'POST') {
				$this->set([CURLOPT_POST => true, CURLOPT_POSTFIELDS => $data->body()]);
			}
			if (isset($data->method) && in_array($data->method,['PUT','PATCH','DELETE'])) {
				$this->set([
					CURLOPT_CUSTOMREQUEST => $data->method,
					CURLOPT_POSTFIELDS => $data->body()
				]);
			}
		}
		return (boolean) curl_setopt_array($this->_resource, $this->options);
	}

	/**
	 * A convenience method to set the curl `CURLOPT_CONNECTTIMEOUT`
	 * setting for the current connection. This determines the number
	 * of seconds to wait while trying to connect.
	 *
	 * Note: A value of 0 may be used to specify an indefinite wait time.
	 *
	 * @param integer $time The timeout value in seconds
	 * @return boolean False if the resource handle is unavailable or the
	 *         option could not be set, true otherwise.
	 */
	public function timeout($time) {
		if (!is_resource($this->_resource)) {
			return false;
		}
		return curl_setopt($this->_resource, CURLOPT_CONNECTTIMEOUT, $time);
	}

	/**
	 * encoding() is currently unimplemented for this socket adapter
	 *
	 * @todo implement Curl::encoding($charset)
	 * @param string $charset
	 */
	public function encoding($charset) {}

	/**
	 * Sets the options to be used in subsequent curl requests.
	 *
	 * @link http://php.net/curl.constants.php PHP Manual: cURL Constants
	 * @param array $flags If $values is an array, $flags will be used as the
	 *        keys to an associative array of curl options. If $values is not set,
	 *        then $flags will be used as the associative array.
	 * @param array $value If set, this array becomes the values for the
	 *        associative array of curl options.
	 * @return void
	 */
	public function set($flags, $value = null) {
		if ($value !== null) {
			$flags = [$flags => $value];
		}
		$this->options = $flags + $this->options;
	}
}