379 lines
15 KiB
PHP
379 lines
15 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Routing\Generator;
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use Psr\Log\LoggerInterface;
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use Symfony\Component\Routing\Exception\InvalidParameterException;
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use Symfony\Component\Routing\Exception\MissingMandatoryParametersException;
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use Symfony\Component\Routing\Exception\RouteNotFoundException;
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use Symfony\Component\Routing\RequestContext;
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use Symfony\Component\Routing\RouteCollection;
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/**
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* UrlGenerator can generate a URL or a path for any route in the RouteCollection
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* based on the passed parameters.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Tobias Schultze <http://tobion.de>
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*/
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class UrlGenerator implements UrlGeneratorInterface, ConfigurableRequirementsInterface
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{
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private const QUERY_FRAGMENT_DECODED = [
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// RFC 3986 explicitly allows those in the query/fragment to reference other URIs unencoded
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'%2F' => '/',
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'%3F' => '?',
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// reserved chars that have no special meaning for HTTP URIs in a query or fragment
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// this excludes esp. "&", "=" and also "+" because PHP would treat it as a space (form-encoded)
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'%40' => '@',
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'%3A' => ':',
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'%21' => '!',
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'%3B' => ';',
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'%2C' => ',',
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'%2A' => '*',
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];
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protected $routes;
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protected $context;
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/**
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* @var bool|null
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*/
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protected $strictRequirements = true;
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protected $logger;
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private $defaultLocale;
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/**
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* This array defines the characters (besides alphanumeric ones) that will not be percent-encoded in the path segment of the generated URL.
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*
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* PHP's rawurlencode() encodes all chars except "a-zA-Z0-9-._~" according to RFC 3986. But we want to allow some chars
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* to be used in their literal form (reasons below). Other chars inside the path must of course be encoded, e.g.
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* "?" and "#" (would be interpreted wrongly as query and fragment identifier),
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* "'" and """ (are used as delimiters in HTML).
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*/
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protected $decodedChars = [
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// the slash can be used to designate a hierarchical structure and we want allow using it with this meaning
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// some webservers don't allow the slash in encoded form in the path for security reasons anyway
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// see http://stackoverflow.com/questions/4069002/http-400-if-2f-part-of-get-url-in-jboss
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'%2F' => '/',
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'%252F' => '%2F',
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// the following chars are general delimiters in the URI specification but have only special meaning in the authority component
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// so they can safely be used in the path in unencoded form
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'%40' => '@',
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'%3A' => ':',
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// these chars are only sub-delimiters that have no predefined meaning and can therefore be used literally
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// so URI producing applications can use these chars to delimit subcomponents in a path segment without being encoded for better readability
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'%3B' => ';',
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'%2C' => ',',
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'%3D' => '=',
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'%2B' => '+',
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'%21' => '!',
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'%2A' => '*',
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'%7C' => '|',
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];
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public function __construct(RouteCollection $routes, RequestContext $context, LoggerInterface $logger = null, string $defaultLocale = null)
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{
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$this->routes = $routes;
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$this->context = $context;
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$this->logger = $logger;
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$this->defaultLocale = $defaultLocale;
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}
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/**
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* {@inheritdoc}
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*/
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public function setContext(RequestContext $context)
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{
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$this->context = $context;
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}
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/**
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* {@inheritdoc}
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*/
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public function getContext()
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{
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return $this->context;
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}
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/**
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* {@inheritdoc}
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*/
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public function setStrictRequirements(?bool $enabled)
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{
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$this->strictRequirements = $enabled;
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}
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/**
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* {@inheritdoc}
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*/
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public function isStrictRequirements()
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{
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return $this->strictRequirements;
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}
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/**
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* {@inheritdoc}
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*/
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public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH)
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{
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$route = null;
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$locale = $parameters['_locale']
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?? $this->context->getParameter('_locale')
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?: $this->defaultLocale;
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if (null !== $locale) {
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do {
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if (null !== ($route = $this->routes->get($name.'.'.$locale)) && $route->getDefault('_canonical_route') === $name) {
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break;
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}
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} while (false !== $locale = strstr($locale, '_', true));
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}
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if (null === $route = $route ?? $this->routes->get($name)) {
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throw new RouteNotFoundException(sprintf('Unable to generate a URL for the named route "%s" as such route does not exist.', $name));
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}
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// the Route has a cache of its own and is not recompiled as long as it does not get modified
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$compiledRoute = $route->compile();
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$defaults = $route->getDefaults();
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$variables = $compiledRoute->getVariables();
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if (isset($defaults['_canonical_route']) && isset($defaults['_locale'])) {
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if (!\in_array('_locale', $variables, true)) {
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unset($parameters['_locale']);
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} elseif (!isset($parameters['_locale'])) {
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$parameters['_locale'] = $defaults['_locale'];
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}
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}
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return $this->doGenerate($variables, $defaults, $route->getRequirements(), $compiledRoute->getTokens(), $parameters, $name, $referenceType, $compiledRoute->getHostTokens(), $route->getSchemes());
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}
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/**
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* @throws MissingMandatoryParametersException When some parameters are missing that are mandatory for the route
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* @throws InvalidParameterException When a parameter value for a placeholder is not correct because
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* it does not match the requirement
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*
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* @return string
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*/
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protected function doGenerate(array $variables, array $defaults, array $requirements, array $tokens, array $parameters, string $name, int $referenceType, array $hostTokens, array $requiredSchemes = [])
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{
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$variables = array_flip($variables);
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$mergedParams = array_replace($defaults, $this->context->getParameters(), $parameters);
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// all params must be given
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if ($diff = array_diff_key($variables, $mergedParams)) {
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throw new MissingMandatoryParametersException(sprintf('Some mandatory parameters are missing ("%s") to generate a URL for route "%s".', implode('", "', array_keys($diff)), $name));
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}
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$url = '';
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$optional = true;
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$message = 'Parameter "{parameter}" for route "{route}" must match "{expected}" ("{given}" given) to generate a corresponding URL.';
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foreach ($tokens as $token) {
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if ('variable' === $token[0]) {
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$varName = $token[3];
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// variable is not important by default
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$important = $token[5] ?? false;
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if (!$optional || $important || !\array_key_exists($varName, $defaults) || (null !== $mergedParams[$varName] && (string) $mergedParams[$varName] !== (string) $defaults[$varName])) {
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// check requirement (while ignoring look-around patterns)
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if (null !== $this->strictRequirements && !preg_match('#^'.preg_replace('/\(\?(?:=|<=|!|<!)((?:[^()\\\\]+|\\\\.|\((?1)\))*)\)/', '', $token[2]).'$#i'.(empty($token[4]) ? '' : 'u'), $mergedParams[$token[3]] ?? '')) {
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if ($this->strictRequirements) {
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throw new InvalidParameterException(strtr($message, ['{parameter}' => $varName, '{route}' => $name, '{expected}' => $token[2], '{given}' => $mergedParams[$varName]]));
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}
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if ($this->logger) {
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$this->logger->error($message, ['parameter' => $varName, 'route' => $name, 'expected' => $token[2], 'given' => $mergedParams[$varName]]);
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}
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return '';
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}
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$url = $token[1].$mergedParams[$varName].$url;
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$optional = false;
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}
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} else {
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// static text
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$url = $token[1].$url;
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$optional = false;
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}
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}
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if ('' === $url) {
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$url = '/';
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}
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// the contexts base URL is already encoded (see Symfony\Component\HttpFoundation\Request)
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$url = strtr(rawurlencode($url), $this->decodedChars);
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// the path segments "." and ".." are interpreted as relative reference when resolving a URI; see http://tools.ietf.org/html/rfc3986#section-3.3
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// so we need to encode them as they are not used for this purpose here
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// otherwise we would generate a URI that, when followed by a user agent (e.g. browser), does not match this route
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$url = strtr($url, ['/../' => '/%2E%2E/', '/./' => '/%2E/']);
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if (str_ends_with($url, '/..')) {
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$url = substr($url, 0, -2).'%2E%2E';
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} elseif (str_ends_with($url, '/.')) {
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$url = substr($url, 0, -1).'%2E';
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}
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$schemeAuthority = '';
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$host = $this->context->getHost();
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$scheme = $this->context->getScheme();
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if ($requiredSchemes) {
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if (!\in_array($scheme, $requiredSchemes, true)) {
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$referenceType = self::ABSOLUTE_URL;
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$scheme = current($requiredSchemes);
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}
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}
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if ($hostTokens) {
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$routeHost = '';
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foreach ($hostTokens as $token) {
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if ('variable' === $token[0]) {
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// check requirement (while ignoring look-around patterns)
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if (null !== $this->strictRequirements && !preg_match('#^'.preg_replace('/\(\?(?:=|<=|!|<!)((?:[^()\\\\]+|\\\\.|\((?1)\))*)\)/', '', $token[2]).'$#i'.(empty($token[4]) ? '' : 'u'), $mergedParams[$token[3]])) {
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if ($this->strictRequirements) {
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throw new InvalidParameterException(strtr($message, ['{parameter}' => $token[3], '{route}' => $name, '{expected}' => $token[2], '{given}' => $mergedParams[$token[3]]]));
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}
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if ($this->logger) {
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$this->logger->error($message, ['parameter' => $token[3], 'route' => $name, 'expected' => $token[2], 'given' => $mergedParams[$token[3]]]);
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}
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return '';
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}
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$routeHost = $token[1].$mergedParams[$token[3]].$routeHost;
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} else {
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$routeHost = $token[1].$routeHost;
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}
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}
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if ($routeHost !== $host) {
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$host = $routeHost;
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if (self::ABSOLUTE_URL !== $referenceType) {
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$referenceType = self::NETWORK_PATH;
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}
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}
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}
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if (self::ABSOLUTE_URL === $referenceType || self::NETWORK_PATH === $referenceType) {
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if ('' !== $host || ('' !== $scheme && 'http' !== $scheme && 'https' !== $scheme)) {
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$port = '';
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if ('http' === $scheme && 80 !== $this->context->getHttpPort()) {
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$port = ':'.$this->context->getHttpPort();
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} elseif ('https' === $scheme && 443 !== $this->context->getHttpsPort()) {
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$port = ':'.$this->context->getHttpsPort();
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}
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$schemeAuthority = self::NETWORK_PATH === $referenceType || '' === $scheme ? '//' : "$scheme://";
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$schemeAuthority .= $host.$port;
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}
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}
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if (self::RELATIVE_PATH === $referenceType) {
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$url = self::getRelativePath($this->context->getPathInfo(), $url);
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} else {
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$url = $schemeAuthority.$this->context->getBaseUrl().$url;
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}
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// add a query string if needed
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$extra = array_udiff_assoc(array_diff_key($parameters, $variables), $defaults, function ($a, $b) {
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return $a == $b ? 0 : 1;
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});
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array_walk_recursive($extra, $caster = static function (&$v) use (&$caster) {
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if (\is_object($v)) {
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if ($vars = get_object_vars($v)) {
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array_walk_recursive($vars, $caster);
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$v = $vars;
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} elseif (method_exists($v, '__toString')) {
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$v = (string) $v;
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}
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}
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});
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// extract fragment
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$fragment = $defaults['_fragment'] ?? '';
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if (isset($extra['_fragment'])) {
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$fragment = $extra['_fragment'];
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unset($extra['_fragment']);
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}
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if ($extra && $query = http_build_query($extra, '', '&', \PHP_QUERY_RFC3986)) {
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$url .= '?'.strtr($query, self::QUERY_FRAGMENT_DECODED);
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}
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if ('' !== $fragment) {
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$url .= '#'.strtr(rawurlencode($fragment), self::QUERY_FRAGMENT_DECODED);
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}
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return $url;
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}
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/**
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* Returns the target path as relative reference from the base path.
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*
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* Only the URIs path component (no schema, host etc.) is relevant and must be given, starting with a slash.
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* Both paths must be absolute and not contain relative parts.
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* Relative URLs from one resource to another are useful when generating self-contained downloadable document archives.
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* Furthermore, they can be used to reduce the link size in documents.
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*
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* Example target paths, given a base path of "/a/b/c/d":
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* - "/a/b/c/d" -> ""
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* - "/a/b/c/" -> "./"
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* - "/a/b/" -> "../"
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* - "/a/b/c/other" -> "other"
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* - "/a/x/y" -> "../../x/y"
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*
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* @param string $basePath The base path
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* @param string $targetPath The target path
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*
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* @return string
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*/
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public static function getRelativePath(string $basePath, string $targetPath)
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{
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if ($basePath === $targetPath) {
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return '';
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}
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$sourceDirs = explode('/', isset($basePath[0]) && '/' === $basePath[0] ? substr($basePath, 1) : $basePath);
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$targetDirs = explode('/', isset($targetPath[0]) && '/' === $targetPath[0] ? substr($targetPath, 1) : $targetPath);
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array_pop($sourceDirs);
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$targetFile = array_pop($targetDirs);
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foreach ($sourceDirs as $i => $dir) {
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if (isset($targetDirs[$i]) && $dir === $targetDirs[$i]) {
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unset($sourceDirs[$i], $targetDirs[$i]);
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} else {
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break;
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}
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}
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$targetDirs[] = $targetFile;
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$path = str_repeat('../', \count($sourceDirs)).implode('/', $targetDirs);
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// A reference to the same base directory or an empty subdirectory must be prefixed with "./".
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// This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
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// as the first segment of a relative-path reference, as it would be mistaken for a scheme name
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// (see http://tools.ietf.org/html/rfc3986#section-4.2).
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return '' === $path || '/' === $path[0]
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|| false !== ($colonPos = strpos($path, ':')) && ($colonPos < ($slashPos = strpos($path, '/')) || false === $slashPos)
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? "./$path" : $path;
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}
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}
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