<?php

abstract class CAS_ProxiedService_Http_Abstract extends CAS_ProxiedService_Abstract implements CAS_ProxiedService_Http
{
	/**
	 * The HTTP request mechanism talking to the target service.
	 *
	 * @var CAS_Request_RequestInterface $requestHandler
	 */
	protected $requestHandler;

	/**
	 * The storage mechanism for cookies set by the target service.
	 *
	 * @var CAS_CookieJar $_cookieJar
	 */
	private $_cookieJar;

	/**
	 * The target service url.
	 * @var string $_url;
	 */
	private $_url;

	/**
	 * Indicator of the number of requests (including redirects performed.
	 *
	 * @var int $_numRequests;
	 */
	private $_numRequests = 0;

	/**
	 * The response headers.
	 *
	 * @var array $_responseHeaders;
	 */
	private $_responseHeaders = array();

	/**
	 * The response status code.
	 *
	 * @var int $_responseStatusCode;
	 */
	private $_responseStatusCode = '';

	/**
	 * The response headers.
	 *
	 * @var string $_responseBody;
	 */
	private $_responseBody = '';


	/**
	 * Constructor.
	 *
	 * @param CAS_Request_RequestInterface $requestHandler request handler object
	 * @param CAS_CookieJar                $cookieJar      cookieJar object
	 *
	 * @return void
	 */
	public function __construct(CAS_Request_RequestInterface $requestHandler, CAS_CookieJar $cookieJar)
	{
		$this->requestHandler = $requestHandler;
		$this->_cookieJar = $cookieJar;
	}


	/**
	 * Answer a service identifier (URL) for whom we should fetch a proxy ticket.
	 *
	 * @return string
	 * @throws Exception If no service url is available.
	 */
	public function getServiceUrl()
	{
		if (empty($this->_url)) {
		    throw new CAS_ProxiedService_Exception(
		        'No URL set via ' . get_class($this) . '->setUrl($url).'
		    );
		}

		return $this->_url;
	}


	/**
	 * Set the URL of the Request
	 *
	 * @param string $url url to set
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function setUrl($url)
	{
		if ($this->hasBeenSent()) {
		    throw new CAS_OutOfSequenceException(
		        'Cannot set the URL, request already sent.'
		    );
		}
		if (!is_string($url)) {
		    throw new CAS_InvalidArgumentException('$url must be a string.');
		}

		$this->_url = $url;
	}


	/**
	 * Perform the request.
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called multiple times.
	 * @throws CAS_ProxyTicketException If there is a proxy-ticket failure.
	 * 		The code of the Exception will be one of:
	 * 			PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE
	 * 			PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE
	 * 			PHPCAS_SERVICE_PT_FAILURE
	 * @throws CAS_ProxiedService_Exception If there is a failure sending the
	 * request to the target service.
	 */
	public function send()
	{
		if ($this->hasBeenSent()) {
		    throw new CAS_OutOfSequenceException(
		        'Cannot send, request already sent.'
		    );
		}

		phpCAS::traceBegin();

		// Get our proxy ticket and append it to our URL.
		$this->initializeProxyTicket();
		$url = $this->getServiceUrl();
		if (strstr($url, '?') === false) {
		    $url = $url . '?ticket=' . $this->getProxyTicket();
		} else {
		    $url = $url . '&ticket=' . $this->getProxyTicket();
		}

		try {
		    $this->makeRequest($url);
		} catch (Exception $e) {
		    phpCAS::traceEnd();
		    throw $e;
		}
	}


	/**
	 * Build and perform a request, following redirects
	 *
	 * @param string $url url for the request
	 *
	 * @return void
	 * @throws CAS_ProxyTicketException If there is a proxy-ticket failure.
	 * 		The code of the Exception will be one of:
	 * 			PHPCAS_SERVICE_PT_NO_SERVER_RESPONSE
	 * 			PHPCAS_SERVICE_PT_BAD_SERVER_RESPONSE
	 * 			PHPCAS_SERVICE_PT_FAILURE
	 * @throws CAS_ProxiedService_Exception If there is a failure sending the
	 * request to the target service.
	 */
	protected function makeRequest($url)
	{
		$this->_numRequests++;
		if ($this->_numRequests > 4) {
		    $message = 'Exceeded the maximum number of redirects (3) in proxied service request.';
		    phpCAS::trace($message);
		    throw new CAS_ProxiedService_Exception($message);
		}

		// Create a new request.
		$request = clone $this->requestHandler;
		$request->setUrl($url);

		// Add any cookies to the request.
		$request->addCookies($this->_cookieJar->getCookies($url));

		// Add any other parts of the request needed by concrete classes
		$this->populateRequest($request);

		// Perform the request.
		phpCAS::trace('Performing proxied service request to \'' . $url . '\'');
		if (!$request->send()) {
		    $message = 'Could not perform proxied service request to URL`'
		    . $url . '\'. ' . $request->getErrorMessage();
		    phpCAS::trace($message);
		    throw new CAS_ProxiedService_Exception($message);
		}

		// Store any cookies from the response;
		$this->_cookieJar->storeCookies($url, $request->getResponseHeaders());

		// Follow any redirects
		if ($redirectUrl = $this->getRedirectUrl($request->getResponseHeaders())
		) {
		    phpCAS::trace('Found redirect:' . $redirectUrl);
		    $this->makeRequest($redirectUrl);
		} else {

		    $this->_responseHeaders = $request->getResponseHeaders();
		    $this->_responseBody = $request->getResponseBody();
		    $this->_responseStatusCode = $request->getResponseStatusCode();
		}
	}


	/**
	 * Add any other parts of the request needed by concrete classes
	 *
	 * @param CAS_Request_RequestInterface $request request interface object
	 *
	 * @return void
	 */
	abstract protected function populateRequest(CAS_Request_RequestInterface $request);


	/**
	 * Answer a redirect URL if a redirect header is found, otherwise null.
	 *
	 * @param array $responseHeaders response header to extract a redirect from
	 *
	 * @return string|null
	 */
	protected function getRedirectUrl(array $responseHeaders)
	{
		foreach ($responseHeaders as $header) {
		    if ( preg_match('/^(Location:|URI:)\s*([^\s]+.*)$/', $header, $matches)
		    ) {
		        return trim(array_pop($matches));
		    }
		}
		return null;
	}


	/**
	 * Answer true if our request has been sent yet.
	 *
	 * @return bool
	 */
	protected function hasBeenSent()
	{
		return ($this->_numRequests > 0);
	}


	/**
	 * Answer the headers of the response.
	 *
	 * @return array An array of header strings.
	 * @throws CAS_OutOfSequenceException If called before the Request has been sent.
	 */
	public function getResponseHeaders()
	{
		if (!$this->hasBeenSent()) {
		    throw new CAS_OutOfSequenceException(
		        'Cannot access response, request not sent yet.'
		    );
		}

		return $this->_responseHeaders;
	}


	/**
	 * Answer HTTP status code of the response
	 *
	 * @return int
	 * @throws CAS_OutOfSequenceException If called before the Request has been sent.
	 */
	public function getResponseStatusCode()
	{
		if (!$this->hasBeenSent()) {
		    throw new CAS_OutOfSequenceException(
		        'Cannot access response, request not sent yet.'
		    );
		}

		return $this->_responseStatusCode;
	}


	/**
	 * Answer the body of response.
	 *
	 * @return string
	 * @throws CAS_OutOfSequenceException If called before the Request has been sent.
	 */
	public function getResponseBody()
	{
		if (!$this->hasBeenSent()) {
		    throw new CAS_OutOfSequenceException(
		        'Cannot access response, request not sent yet.'
		    );
		}

		return $this->_responseBody;
	}


	/**
	 * Answer the cookies from the response. This may include cookies set during
	 * redirect responses.
	 *
	 * @return array An array containing cookies. E.g. array('name' => 'val');
	 */
	public function getCookies()
	{
		return $this->_cookieJar->getCookies($this->getServiceUrl());
	}
}
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