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<?php
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namespace LinkedDataCenter;
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use Psr\Http\Message\ResponseInterface;
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use Psr\Http\Message\ServerRequestInterface;
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use Psr\Http\Server\RequestHandlerInterface;
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use Psr\Http\Server\MiddlewareInterface;
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use RuntimeException;
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/**
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* This middleware rewrite urls using the rules in 'urlRewriting.rules' container parameter
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*/
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class UrlRewriter implements MiddlewareInterface
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{
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/**
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* @var array of rules to be executed on Response uri
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*/
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private $rules;
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/**
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* Configure the rewriting rules.
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*/
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public function __construct(array $rules)
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{
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$this->rules = $rules;
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}
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/**
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* Process a server request and return a response.
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*/
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
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{
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$uri = $request->getUri();
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if ($scheme = $uri->getScheme()) { $scheme .= ':';}
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$authority = $uri->getAuthority();
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$path = $uri->getPath();
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if ($query = $uri->getQuery()) { $query = '?'.$query;};
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if ($fragment = $uri->getFragment()) { $fragment = '#'.$fragment;};
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// invariant part is not considered in match
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$invariantUriPart = "$scheme//$authority";
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// $matchSubject is the portion of the uri we are interest in
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$replacedUriPart=$this->appyRules($path.$query.$fragment);
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$parsedNewUrl = parse_url($invariantUriPart.$replacedUriPart );
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$request = $request->withUri(
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$uri->withPath($parsedNewUrl['path'] ?? '')
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->withQuery($parsedNewUrl['query'] ?? '')
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->withFragment($parsedNewUrl['fragment'] ?? '')
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);
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return $handler->handle($request);
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}
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/**
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* Apply all matching rules to a path.
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*/
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private function appyRules(string $subject): string
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{
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foreach($this->rules as $pattern=>$replacement) {
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$pattern = '#^'. $pattern.'$#';
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$subject = preg_replace($pattern, $replacement, $subject);
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if( is_null($subject)){
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throw new RuntimeException("Bad replacement '$pattern', '$replacement'");
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}
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}
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return $subject;
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}
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} |
linkeddatacenter /
url-rewriter
