gjerokrsteski/pimf-framework

<?php
/**
 * Pimf
 *
 * @copyright Copyright (c)  Gjero Krsteski (http://krsteski.de)
 * @license   http://opensource.org/licenses/MIT MIT
 */

namespace Pimf;

/**
 * Route
 *
 * This class is a relationship of HTTP method(s), an HTTP URI to create
 * a Pimf application route. The Pimf application will determine
 * the one Route object to dispatch for the current HTTP request.
 *
 * Each route object will have a URI pattern. This pattern must match the
 * current HTTP request's URI for the route object to be dispatched by
 * the Pimf application. The route pattern may contain parameters, segments
 * prefixed with a colon (:). For example:
 *
 *     /controller/:action/:id
 *
 * When the route is dispatched, it's parameters array will be populated
 * with the values of the corresponding HTTP request URI segments.
 *
 * @package Pimf
 * @author  Gjero Krsteski <gjero@krsteski.de>
 */
class Route
{
    /**
     * @var bool
     */
    private $matched = true;

    /**
     * @var array
     */
    private $params = array();

    /**
     * The route pattern (e.g. "/controller/:action/:id")
     *
     * @var string
     */
    private $rule;

    /**
     * Target to custom controller/action
     *
     * @var array
     */
    private $target;

    /**
     * Array of URL parameter names
     *
     * @var array
     */
    protected $names = array();

    /**
     * Array of URL parameter names with + at the end
     *
     * @var array
     */
    protected $namesPath = array();

    /**
     * Conditions for this route's URL parameters
     *
     * @var array
     */
    private $conditions;

    /**
     * @param string $rule
     * @param array  $target
     * @param array  $conditions
     */
    public function __construct($rule, array $target = array(), array $conditions = array())
    {
        $this->rule = $rule;
        $this->conditions = $conditions;
        $this->target = $target;
    }

    /**
     * @return Route
     */
    public function init()
    {
        //convert URL params into regex patterns, construct a regex for this route, load params
        $regex = preg_replace_callback(
            '#:([\w]+)\+?#', array($this, 'computeUrlRegex'), str_replace(')', ')?', (string)$this->rule)
        );

        if (substr($this->rule, -1) === '/') {
            $regex .= '?';
        }

        //cache URL params names and values if this route matches the current HTTP request
        $params = array();
        if (!preg_match('#^' . $regex . '$#', self::computeUri(), $params)) {
            $this->matched = false;

            return $this;
        }

        foreach ($this->names as $name) {
            if (isset($params[$name])) {
                if (isset($this->namesPath[$name])) {
                    $this->params[$name] = explode('/', urldecode($params[$name]));
                } else {
                    $this->params[$name] = urldecode($params[$name]);
                }
            }
        }

        foreach ($this->target as $key => $value) {
            $this->params[$key] = $value;
        }

        return $this;
    }

    /**
     * @param array $matches
     *
     * @return string
     */
    private function computeUrlRegex(array $matches)
    {
        $this->names[] = $matches[1];

        if (isset($this->conditions[$matches[1]])) {
            return '(?P<' . $matches[1] . '>' . $this->conditions[$matches[1]] . ')';
        }

        if (substr($matches[0], -1) === '+') {

            $this->namesPath[$matches[1]] = 1;

            return '(?P<' . $matches[1] . '>.+)';
        }

        return '(?P<' . $matches[1] . '>[^/]+)';
    }

    /**
     * @throws \RuntimeException If request-uri does not match site base-url
     * @return string
     */
    private function computeUri()
    {
        $uri = Uri::full();
        $pos = strpos($uri, '?');
        $app = Config::get('app');
        $app_url = empty($app['url']) ? "" : $app['url'];
        $base_uri = parse_url($app_url);
        $base_path = isset($base_uri['path']) ? $base_uri['path'] : "";

        if (strlen($base_path) > 0) {
            // if $base_path exists
            if (strpos($uri, $base_path) == 0) {
                $uri = substr($uri, strlen($base_path));
            } else {
                throw \RuntimeException('request uri does not match site base url');
            }
        }

        if ($pos !== false) {
            return substr($uri, 0, $pos);
        }

        return $uri;
    }

    /**
     * @return boolean
     */
    public function matches()
    {
        return $this->matched;
    }

    /**
     * @return array
     */
    public function getParams()
    {
        return $this->params;
    }

    /**
     * @return string
     */
    public function getRule()
    {
        return $this->rule;
    }
}