Yiisoft\Router\FastRoute\FastRoute

Complexity

Total Complexity

54

Size/Duplication

Total Lines	524
Duplicated Lines	0 %

Importance

Changes	4
Bugs	0	Features	0

21 Methods

Rating	Name	Duplication	Size	Complexity
A	setUriPrefix()	0	3	1
A	getUriPrefix()	0	3	1
A	loadConfig()	0	16	5
A	cacheDispatchData()	0	27	5
A	getDispatchData()	0	13	3
A	generatePath()	0	24	4
A	marshalFailedRoute()	0	8	2
A	addRoute()	0	3	1
A	getRoute()	0	7	2
A	generate()	0	18	2
A	injectRoute()	0	11	2
A	marshalMatchedRoute()	0	31	6
A	createDispatcherCallback()	0	4	1
A	loadDispatchData()	0	21	3
A	marshalMethodNotAllowedResult()	0	14	2
A	injectRoutes()	0	5	2
A	__construct()	0	11	1
A	missingParameters()	0	24	5
A	getDispatcher()	0	9	2
A	checkUrlParameters()	0	12	2
A	match()	0	13	2

<?php
declare(strict_types=1);

namespace Yiisoft\Router\FastRoute;

use FastRoute\Dispatcher;
use FastRoute\Dispatcher\GroupCountBased;
use FastRoute\RouteCollector;
use FastRoute\RouteParser;
use Psr\Http\Message\ServerRequestInterface;
use Yiisoft\Router\MatchingResult;
use Yiisoft\Router\Method;
use Yiisoft\Router\Route;
use Yiisoft\Router\RouteNotFoundException;
use Yiisoft\Router\RouterInterface;
use function array_key_exists;
use function array_keys;
use function array_merge;
use function array_reduce;
use function array_unique;
use function dirname;
use function file_exists;
use function file_put_contents;
use function implode;
use function is_array;
use function is_dir;
use function is_string;
use function is_writable;
use function preg_match;
use function restore_error_handler;
use function set_error_handler;
use function sprintf;
use function var_export;
use const E_WARNING;

/**
 * Router implementation bridging nikic/fast-route.
 * Adapted from https://github.com/zendframework/zend-expressive-fastroute/
 */
class FastRoute implements RouterInterface
{
    /**
     * Template used when generating the cache file.
     */
    public const CACHE_TEMPLATE = <<< 'EOT'
<?php
return %s;
EOT;

    /**
     * @const string Configuration key used to enable/disable fastroute caching
     */
    public const CONFIG_CACHE_ENABLED = 'cache_enabled';

    /**
     * @const string Configuration key used to set the cache file path
     */
    public const CONFIG_CACHE_FILE = 'cache_file';

    /**
     * Cache generated route data?
     *
     * @var bool
     */
    private $cacheEnabled = false;

    /**
     * Cache file path relative to the project directory.
     *
     * @var string
     */
    private $cacheFile = 'data/cache/fastroute.php.cache';

    /**
     * @var callable A factory callback that can return a dispatcher.
     */
    private $dispatcherCallback;

    /**
     * Cached data used by the dispatcher.
     *
     * @var array
     */
    private $dispatchData = [];

    /**
     * True if cache is enabled and valid dispatch data has been loaded from
     * cache.
     *
     * @var bool
     */
    private $hasCache = false;

    /**
     * FastRoute router
     *
     * @var RouteCollector
     */
    private $router;

    /**
     * All attached routes as Route instances
     *
     * @var Route[]
     */
    private $routes = [];

    /**
     * Routes to inject into the underlying RouteCollector.
     *
     * @var Route[]
     */
    private $routesToInject = [];
    /**
     * @var RouteParser
     */
    private $routeParser;
    /** @var string */
    private $uriPrefix = '';

    /**
     * Constructor
     *
     * Accepts optionally a FastRoute RouteCollector and a callable factory
     * that can return a FastRoute dispatcher.
     *
     * If either is not provided defaults will be used:
     *
     * - A RouteCollector instance will be created composing a RouteParser and
     *   RouteGenerator.
     * - A callable that returns a GroupCountBased dispatcher will be created.
     *
     * @param null|RouteCollector $router If not provided, a default
     *     implementation will be used.
     * @param RouteParser $routeParser
     * @param null|callable $dispatcherFactory Callable that will return a
     *     FastRoute dispatcher.
     * @param array $config Array of custom configuration options.
     */
    public function __construct(
        RouteCollector $router,
        RouteParser $routeParser,
        callable $dispatcherFactory = null,
        array $config = null
    ) {
        $this->router = $router;
        $this->dispatcherCallback = $dispatcherFactory;
        $this->routeParser = $routeParser;

        $this->loadConfig($config);
    }

    /**
     * Load configuration parameters
     *
     * @param null|array $config Array of custom configuration options.
     */
    private function loadConfig(array $config = null): void
    {
        if (null === $config) {
            return;
        }

        if (isset($config[self::CONFIG_CACHE_ENABLED])) {
            $this->cacheEnabled = (bool)$config[self::CONFIG_CACHE_ENABLED];
        }

        if (isset($config[self::CONFIG_CACHE_FILE])) {
            $this->cacheFile = (string)$config[self::CONFIG_CACHE_FILE];
        }

        if ($this->cacheEnabled) {
            $this->loadDispatchData();
        }
    }

    /**
     * Add a route to the collection.
     *
     * Uses the HTTP methods associated (creating sane defaults for an empty
     * list or Route::HTTP_METHOD_ANY) and the path, and uses the path as
     * the name (to allow later lookup of the middleware).
     * @param Route $route
     */
    public function addRoute(Route $route): void
    {
        $this->routesToInject[] = $route;
    }

    public function match(ServerRequestInterface $request): MatchingResult
    {
        // Inject any pending routes
        $this->injectRoutes();

        $dispatchData = $this->getDispatchData();
        $path = rawurldecode($request->getUri()->getPath());
        $method = $request->getMethod();
        $result = $this->getDispatcher($dispatchData)->dispatch($method, $path);

        return $result[0] !== Dispatcher::FOUND
            ? $this->marshalFailedRoute($result)
            : $this->marshalMatchedRoute($result, $method);
    }

    public function getUriPrefix(): string
    {
        return $this->uriPrefix;
    }

    public function setUriPrefix(string $prefix): void
    {
        $this->uriPrefix = $prefix;
    }

    /**
     * Generate a URI based on a given route.
     *
     * Replacements in FastRoute are written as `{name}` or `{name:<pattern>}`;
     * this method uses `FastRoute\RouteParser\Std` to search for the best route
     * match based on the available substitutions and generates a uri.
     *
     * @param string $name Route name.
     *     pattern.
     * @param array $parameters Key/value option pairs to pass to the router for
     *     purposes of generating a URI; takes precedence over options present
     *     in route used to generate URI.
     *
     * @return string URI path generated.
     * @throws \RuntimeException if the route name is not known or a parameter value does not match its regex.
     */
    public function generate(string $name, array $parameters = []): string
    {
        // Inject any pending routes
        $this->injectRoutes();

        $route = $this->getRoute($name);
        $parameters = array_merge($route->getDefaults(), $parameters);

        $parsedRoutes = $this->routeParser->parse($route->getPattern());

        if (count($parsedRoutes) === 0) {
            throw new RouteNotFoundException();
        }
        $parts = reset($parsedRoutes);

        $this->checkUrlParameters($name, $parameters, $parts);

        return $this->generatePath($parameters, $parts);
    }

    /**
     * Checks for any missing route parameters
     * @param array $parts
     * @param array $substitutions
     * @return array with minimum required parameters if any are missing or an empty array if none are missing
     */
    private function missingParameters(array $parts, array $substitutions): array
    {
        $missingParameters = [];

        // Gather required parameters
        foreach ($parts as $part) {
            if (is_string($part)) {
                continue;
            }

            $missingParameters[] = $part[0];
        }

        // Check if all parameters exist
        foreach ($missingParameters as $param) {
            if (!isset($substitutions[$param])) {
                // Return the parameters so they can be used in an
                // exception if needed
                return $missingParameters;
            }
        }

        // All required parameters are available
        return [];
    }

    /**
     * Retrieve the dispatcher instance.
     *
     * Uses the callable factory in $dispatcherCallback, passing it $data
     * (which should be derived from the router's getData() method); this
     * approach is done to allow testing against the dispatcher.
     *
     * @param array|object $data Data from RouteCollection::getData()
     * @return Dispatcher
     */
    private function getDispatcher($data): Dispatcher
    {
        if (!$this->dispatcherCallback) {
            $this->dispatcherCallback = $this->createDispatcherCallback();
        }

        $factory = $this->dispatcherCallback;

        return $factory($data);
    }

    /**
     * Return a default implementation of a callback that can return a Dispatcher.
     */
    private function createDispatcherCallback(): callable
    {
        return static function ($data) {
            return new GroupCountBased($data);
        };
    }

    /**
     * Marshal a routing failure result.
     *
     * If the failure was due to the HTTP method, passes the allowed HTTP
     * methods to the factory.
     * @param array $result
     * @return MatchingResult
     */
    private function marshalFailedRoute(array $result): MatchingResult
    {
        $resultCode = $result[0];
        if ($resultCode === Dispatcher::METHOD_NOT_ALLOWED) {
            return MatchingResult::fromFailure($result[1]);
        }

        return MatchingResult::fromFailure(Method::ANY);
    }

    /**
     * Marshals a route result based on the results of matching and the current HTTP method.
     * @param array $result
     * @param string $method
     * @return MatchingResult
     */
    private function marshalMatchedRoute(array $result, string $method): MatchingResult
    {
        [, $path, $parameters] = $result;

        /* @var Route $route */
        $route = array_reduce($this->routes, function ($matched, Route $route) use ($path, $method) {
            if ($matched) {
                return $matched;
            }

            if ($path !== $route->getPattern()) {
                return $matched;
            }

            if (!in_array($method, $route->getMethods(), true)) {
                return $matched;
            }

            return $route;
        }, false);

        if (false === $route) {

The condition false === $route is always false.

            return $this->marshalMethodNotAllowedResult($result);
        }

        $options = $route->getParameters();
        if (!empty($options['defaults'])) {
            $parameters = array_merge($options['defaults'], $parameters);
        }

        return MatchingResult::fromSuccess($route, $parameters);
    }

    /**
     * Inject queued Route instances into the underlying router.
     */
    private function injectRoutes(): void
    {
        foreach ($this->routesToInject as $index => $route) {
            $this->injectRoute($route);
            unset($this->routesToInject[$index]);
        }
    }

    /**
     * Inject a Route instance into the underlying router.
     * @param Route $route
     */
    private function injectRoute(Route $route): void
    {
        // Filling the routes' hash-map is required by the `generateUri` method
        $this->routes[$route->getName()] = $route;

        // Skip feeding FastRoute collector if valid cached data was already loaded
        if ($this->hasCache) {
            return;
        }

        $this->router->addRoute($route->getMethods(), $route->getPattern(), $route->getPattern());
    }

    /**
     * Get the dispatch data either from cache or freshly generated by the
     * FastRoute data generator.
     *
     * If caching is enabled, store the freshly generated data to file.
     */
    private function getDispatchData(): array
    {
        if ($this->hasCache) {
            return $this->dispatchData;
        }

        $dispatchData = (array)$this->router->getData();

        if ($this->cacheEnabled) {
            $this->cacheDispatchData($dispatchData);
        }

        return $dispatchData;
    }

    /**
     * Load dispatch data from cache
     * @throws \RuntimeException If the cache file contains invalid data
     */
    private function loadDispatchData(): void
    {
        set_error_handler(function () {
        }, E_WARNING); // suppress php warnings
        $dispatchData = include $this->cacheFile;
        restore_error_handler();

        // Cache file does not exist
        if (false === $dispatchData) {
            return;
        }

        if (!is_array($dispatchData)) {
            throw new \RuntimeException(sprintf(
                'Invalid cache file "%s"; cache file MUST return an array',
                $this->cacheFile
            ));
        }

        $this->hasCache = true;
        $this->dispatchData = $dispatchData;
    }

    /**
     * Save dispatch data to cache
     * @param array $dispatchData
     * @return int|false bytes written to file or false if error
     * @throws \RuntimeException If the cache directory does not exist.
     * @throws \RuntimeException If the cache directory is not writable.
     * @throws \RuntimeException If the cache file exists but is not writable
     */
    private function cacheDispatchData(array $dispatchData)
    {
        $cacheDir = dirname($this->cacheFile);

        if (!is_dir($cacheDir)) {
            throw new \RuntimeException(sprintf(
                'The cache directory "%s" does not exist',
                $cacheDir
            ));
        }

        if (!is_writable($cacheDir)) {
            throw new \RuntimeException(sprintf(
                'The cache directory "%s" is not writable',
                $cacheDir
            ));
        }

        if (file_exists($this->cacheFile) && !is_writable($this->cacheFile)) {
            throw new \RuntimeException(sprintf(
                'The cache file %s is not writable',
                $this->cacheFile
            ));
        }

        return file_put_contents(
            $this->cacheFile, sprintf(self::CACHE_TEMPLATE, var_export($dispatchData, true)), LOCK_EX
        );
    }

    private function marshalMethodNotAllowedResult(array $result): MatchingResult
    {
        $path = $result[1];

        $allowedMethods = array_unique(array_reduce($this->routes,
            static function ($allowedMethods, Route $route) use ($path) {
                if ($path !== $route->getPattern()) {
                    return $allowedMethods;
                }

                return array_merge($allowedMethods, $route->getMethods());
            }, []));

        return MatchingResult::fromFailure($allowedMethods);
    }

    /**
     * @param string $name
     * @return Route
     */
    private function getRoute(string $name): Route
    {
        if (!array_key_exists($name, $this->routes)) {
            throw new RouteNotFoundException($name);
        }

        return $this->routes[$name];
    }

    /**
     * @param string $name
     * @param array $parameters
     * @param array $parts
     */
    private function checkUrlParameters(string $name, array $parameters, array $parts): void
    {
        // Check if all parameters can be substituted
        $missingParameters = $this->missingParameters($parts, $parameters);

        // If not all parameters can be substituted, try the next route
        if (!empty($missingParameters)) {
            throw new  \RuntimeException(sprintf(
                'Route `%s` expects at least parameter values for [%s], but received [%s]',
                $name,
                implode(',', $missingParameters),
                implode(',', array_keys($parameters))
            ));
        }
    }

    /**
     * @param array $parameters
     * @param array $parts
     * @return string
     */
    private function generatePath(array $parameters, array $parts): string
    {
        $path = $this->getUriPrefix();
        foreach ($parts as $part) {
            if (is_string($part)) {
                // Append the string
                $path .= $part;
                continue;
            }

            // Check substitute value with regex
            if (!preg_match('~^' . $part[1] . '$~', (string)$parameters[$part[0]])) {
                throw new \RuntimeException(sprintf(
                    'Parameter value for [%s] did not match the regex `%s`',
                    $part[0],
                    $part[1]
                ));
            }

            // Append the substituted value
            $path .= $parameters[$part[0]];
        }

        return $path;
    }
}