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