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UrlGenerator.php
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UrlGenerator.php
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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 Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\RequestContext;
use Symfony\Component\Routing\Exception\InvalidParameterException;
use Symfony\Component\Routing\Exception\RouteNotFoundException;
use Symfony\Component\Routing\Exception\MissingMandatoryParametersException;
use Symfony\Component\HttpKernel\Log\LoggerInterface;
/**
* UrlGenerator generates a URL based on a set of routes.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Tobias Schultze <http://tobion.de>
*
* @api
*/
class UrlGenerator implements UrlGeneratorInterface, ConfigurableRequirementsInterface
{
/**
* @var RouteCollection
*/
protected $routes;
/**
* @var RequestContext
*/
protected $context;
/**
* @var Boolean|null
*/
protected $strictRequirements = true;
/**
* @var LoggerInterface|null
*/
protected $logger;
/**
* 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 = array(
// 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' => '/',
// 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' => '|',
);
/**
* Constructor.
*
* @param RouteCollection $routes A RouteCollection instance
* @param RequestContext $context The context
* @param LoggerInterface|null $logger A logger instance
*
* @api
*/
public function __construct(RouteCollection $routes, RequestContext $context, LoggerInterface $logger = null)
{
$this->routes = $routes;
$this->context = $context;
$this->logger = $logger;
}
/**
* {@inheritdoc}
*/
public function setContext(RequestContext $context)
{
$this->context = $context;
}
/**
* {@inheritdoc}
*/
public function getContext()
{
return $this->context;
}
/**
* {@inheritdoc}
*/
public function setStrictRequirements($enabled)
{
$this->strictRequirements = null === $enabled ? null : (Boolean) $enabled;
}
/**
* {@inheritdoc}
*/
public function isStrictRequirements()
{
return $this->strictRequirements;
}
/**
* {@inheritDoc}
*/
public function generate($name, $parameters = array(), $absolute = false)
{
if (null === $route = $this->routes->get($name)) {
throw new RouteNotFoundException(sprintf('Route "%s" 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();
return $this->doGenerate($compiledRoute->getVariables(), $route->getDefaults(), $route->getRequirements(), $compiledRoute->getTokens(), $parameters, $name, $absolute, $compiledRoute->getHostnameTokens());
}
/**
* @throws MissingMandatoryParametersException When route has some missing mandatory parameters
* @throws InvalidParameterException When a parameter value is not correct
*/
protected function doGenerate($variables, $defaults, $requirements, $tokens, $parameters, $name, $absolute, $hostnameTokens)
{
$variables = array_flip($variables);
$mergedParams = array_replace($defaults, $this->context->getParameters(), $parameters);
// all params must be given
if ($diff = array_diff_key($variables, $mergedParams)) {
throw new MissingMandatoryParametersException(sprintf('The "%s" route has some missing mandatory parameters ("%s").', $name, implode('", "', array_keys($diff))));
}
$url = '';
$optional = true;
foreach ($tokens as $token) {
if ('variable' === $token[0]) {
if (!$optional || !array_key_exists($token[3], $defaults) || (string) $mergedParams[$token[3]] !== (string) $defaults[$token[3]]) {
// check requirement
if (null !== $this->strictRequirements && !preg_match('#^'.$token[2].'$#', $mergedParams[$token[3]])) {
$message = sprintf('Parameter "%s" for route "%s" must match "%s" ("%s" given).', $token[3], $name, $token[2], $mergedParams[$token[3]]);
if ($this->strictRequirements) {
throw new InvalidParameterException($message);
}
if ($this->logger) {
$this->logger->err($message);
}
return null;
}
$url = $token[1].$mergedParams[$token[3]].$url;
$optional = false;
}
} else {
// static text
$url = $token[1].$url;
$optional = false;
}
}
if ('' === $url) {
$url = '/';
}
// do not encode the contexts base url as it is already encoded (see Symfony\Component\HttpFoundation\Request)
$url = $this->context->getBaseUrl().strtr(rawurlencode($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, array('/../' => '/%2E%2E/', '/./' => '/%2E/'));
if ('/..' === substr($url, -3)) {
$url = substr($url, 0, -2) . '%2E%2E';
} elseif ('/.' === substr($url, -2)) {
$url = substr($url, 0, -1) . '%2E';
}
// add a query string if needed
$extra = array_diff_key($parameters, $variables);
if ($extra && $query = http_build_query($extra, '', '&')) {
$url .= '?'.$query;
}
if ($host = $this->context->getHost()) {
$scheme = $this->context->getScheme();
if (isset($requirements['_scheme']) && ($req = strtolower($requirements['_scheme'])) && $scheme != $req) {
$absolute = true;
$scheme = $req;
}
if ($hostnameTokens) {
$routeHost = '';
foreach ($hostnameTokens as $token) {
if ('variable' === $token[0]) {
if (null !== $this->strictRequirements && !preg_match('#^'.$token[2].'$#', $mergedParams[$token[3]])) {
$message = sprintf('Parameter "%s" for route "%s" must match "%s" ("%s" given).', $token[3], $name, $token[2], $mergedParams[$token[3]]);
if ($this->strictRequirements) {
throw new InvalidParameterException($message);
}
if ($this->logger) {
$this->logger->err($message);
}
return null;
}
$routeHost = $token[1].$mergedParams[$token[3]].$routeHost;
} elseif ('text' === $token[0]) {
$routeHost = $token[1].$routeHost;
}
}
if ($routeHost != $host) {
$host = $routeHost;
$absolute = true;
}
}
if ($absolute) {
$port = '';
if ('http' === $scheme && 80 != $this->context->getHttpPort()) {
$port = ':'.$this->context->getHttpPort();
} elseif ('https' === $scheme && 443 != $this->context->getHttpsPort()) {
$port = ':'.$this->context->getHttpsPort();
}
$url = $scheme.'://'.$host.$port.$url;
}
}
return $url;
}
}