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<?php namespace MediaWiki\Rest; use MediaWiki\Rest\HeaderParser\HttpDate; use MediaWiki\Rest\HeaderParser\IfNoneMatch; use RuntimeException; use Wikimedia\Timestamp\ConvertibleTimestamp; class ConditionalHeaderUtil { /** @var bool */ private $varnishETagHack = true; /** @var string|null */ private $eTag; /** @var int|null */ private $lastModified; /** @var bool */ private $hasRepresentation; /** * Initialize the object with information about the requested resource. * * @param string|null $eTag The entity-tag (including quotes), or null if * it is unknown. * @param string|int|null $lastModified The Last-Modified date in a format * accepted by ConvertibleTimestamp, or null if it is unknown. * @param bool|null $hasRepresentation Whether the server has a current * representation of the target resource. This should be true if the * resource exists, and false if it does not exist. It is used for * wildcard validators -- the intended use case is to abort a PUT if the * resource does (or does not) exist. If null is passed, we assume that * the resource exists if an ETag was specified for it. */ public function setValidators( $eTag, $lastModified, $hasRepresentation ) { $this->eTag = $eTag; if ( $lastModified === null ) { $this->lastModified = null; } else { $this->lastModified = (int)ConvertibleTimestamp::convert( TS_UNIX, $lastModified ); } $this->hasRepresentation = $hasRepresentation ?? ( $eTag !== null ); } /** * If the Varnish ETag hack is disabled by calling this method, * strong ETag comparison will follow RFC 7232, rejecting all weak * ETags for If-Match comparison. * * @param bool $hack */ public function setVarnishETagHack( $hack ) { $this->varnishETagHack = $hack; } /** * Check conditional request headers in the order required by RFC 7232 section 6. * * @param RequestInterface $request * @return int|null The status code to immediately return, or null to * continue processing the request. */ public function checkPreconditions( RequestInterface $request ) { $parser = new IfNoneMatch; if ( $this->eTag !== null ) { $resourceTag = $parser->parseETag( $this->eTag ); if ( !$resourceTag ) { throw new RuntimeException( 'Invalid ETag returned by handler: `' . $parser->getLastError() . '`' ); } } else { $resourceTag = null; } $getOrHead = in_array( $request->getMethod(), [ 'GET', 'HEAD' ] ); if ( $request->hasHeader( 'If-Match' ) ) { $im = $request->getHeader( 'If-Match' ); $match = false; foreach ( $parser->parseHeaderList( $im ) as $tag ) { if ( ( $tag['whole'] === '*' && $this->hasRepresentation ) || $this->strongCompare( $resourceTag, $tag ) ) { $match = true; break; } } if ( !$match ) { return 412; } } elseif ( $request->hasHeader( 'If-Unmodified-Since' ) ) { $requestDate = HttpDate::parse( $request->getHeader( 'If-Unmodified-Since' )[0] ); if ( $requestDate !== null && ( $this->lastModified === null || $this->lastModified > $requestDate ) ) { return 412; } } if ( $request->hasHeader( 'If-None-Match' ) ) { $inm = $request->getHeader( 'If-None-Match' ); foreach ( $parser->parseHeaderList( $inm ) as $tag ) { if ( ( $tag['whole'] === '*' && $this->hasRepresentation ) || $this->weakCompare( $resourceTag, $tag ) ) { return $getOrHead ? 304 : 412; } } } elseif ( $getOrHead && $request->hasHeader( 'If-Modified-Since' ) ) { $requestDate = HttpDate::parse( $request->getHeader( 'If-Modified-Since' )[0] ); if ( $requestDate !== null && $this->lastModified !== null && $this->lastModified <= $requestDate ) { return 304; } } // RFC 7232 states that If-Range should be evaluated here. However, the // purpose of If-Range is to cause the Range request header to be // conditionally ignored, not to immediately send a response, so it // doesn't fit here. RFC 7232 only requires that If-Range be checked // after the other conditional header fields, a requirement that is // satisfied if it is processed in Handler::execute(). return null; } /** * Set Last-Modified and ETag headers in the response according to the cached * values set by setValidators(), which are also used for precondition checks. * * If the headers are already present in the response, the existing headers * take precedence. * * @param ResponseInterface $response */ public function applyResponseHeaders( ResponseInterface $response ) { if ( $this->lastModified !== null && !$response->hasHeader( 'Last-Modified' ) ) { $response->setHeader( 'Last-Modified', HttpDate::format( $this->lastModified ) ); } if ( $this->eTag !== null && !$response->hasHeader( 'ETag' ) ) { $response->setHeader( 'ETag', $this->eTag ); } } /** * The weak comparison function, per RFC 7232, section 2.3.2. * * @param array|null $resourceETag ETag generated by the handler, parsed tag info array * @param array|null $headerETag ETag supplied by the client, parsed tag info array * @return bool */ private function weakCompare( $resourceETag, $headerETag ) { if ( $resourceETag === null || $headerETag === null ) { return false; } return $resourceETag['contents'] === $headerETag['contents']; } /** * The strong comparison function * * A strong ETag returned by the server may have been "weakened" by Varnish when applying * compression. So optionally ignore the weakness of the header. * {@link https://varnish-cache.org/docs/6.0/users-guide/compression.html}. * @see T238849 and T310710 * * @param array|null $resourceETag ETag generated by the handler, parsed tag info array * @param array|null $headerETag ETag supplied by the client, parsed tag info array * * @return bool */ private function strongCompare( $resourceETag, $headerETag ) { if ( $resourceETag === null || $headerETag === null ) { return false; } return !$resourceETag['weak'] && ( $this->varnishETagHack || !$headerETag['weak'] ) && $resourceETag['contents'] === $headerETag['contents']; } }
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