forked from friendica/php-json-ld
Add relative @context URL resolution.
This commit is contained in:
Dave Longley
parent
ef8769fe5a
commit
7b20e349af
109
jsonld.php
109
jsonld.php
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@ -216,6 +216,70 @@ function jsonld_unregister_rdf_parser($content_type) {
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}
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}
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/**
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* Converts a relative path into an absolute URL.
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*
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* @param string $path the relative path.
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* @param string $url the absolute URL base.
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*
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* @return string the absolute URL for the given relative path.
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*/
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function jsonld_to_absolute_url($path, $url) {
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// validate path (it may already be an absolute URL)
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if(filter_var($path, FILTER_VALIDATE_URL) === false) {
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$url = parse_url($url);
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$rval = "{$url['scheme']}://";
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if(isset($url['user']) || isset($url['pass'])) {
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$rval .= "{$url['user']}:{$url['pass']}@";
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}
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$rval .= $url['host'];
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if(isset($url['port'])) {
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$rval .= ":{$url['port']}";
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}
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$rval .= jsonld_prepend_base($url['path'], $path);
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if(strrpos($rval, '?') === false && isset($url['query'])) {
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$rval .= "?{$url['query']}";
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}
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if(strrpos($rval, '#') === false && isset($url['fragment'])) {
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$rval .= "#{$url['fragment']}";
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}
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}
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else {
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$rval = $path;
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}
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// validate result
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if(filter_var($rval, FILTER_VALIDATE_URL) === false) {
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throw new JsonLdException(
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'Malformed URL.', 'jsonld.InvalidUrl', array('url' => $rval));
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}
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return $rval;
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}
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/**
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* Prepend a relative IRI to a base IRI.
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*
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* @param string $base the base IRI.
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* @param string $iri the relative IRI.
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*/
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function jsonld_prepend_base($base, $iri) {
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if($iri === '' || strpos($iri, '#') === 0) {
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return "$base$iri";
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}
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// prepend last directory for base
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$idx = strrpos($base, '/');
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if($idx === false) {
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return $iri;
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}
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return substr($base, 0, $idx + 1) . $iri;
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}
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/**
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* A JSON-LD processor.
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*/
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@ -376,7 +440,8 @@ class JsonLdProcessor {
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// resolve all @context URLs in the input
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$input = self::copy($input);
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try {
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$this->_resolveContextUrls($input, new stdClass(), $options['resolver']);
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$this->_resolveContextUrls(
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$input, new stdClass(), $options['resolver'], $options['base']);
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}
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catch(Exception $e) {
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throw new JsonLdException(
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@ -627,7 +692,8 @@ class JsonLdProcessor {
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$ctx = (object)array('@context' => $ctx);
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}
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try {
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$this->_resolveContextUrls($ctx, new stdClass(), $options['resolver']);
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$this->_resolveContextUrls(
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$ctx, new stdClass(), $options['resolver'], $options['base']);
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}
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catch(Exception $e) {
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throw new JsonLdException(
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@ -3535,17 +3601,18 @@ class JsonLdProcessor {
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* @param stdClass $urls a map of URLs (url => false/@contexts).
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* @param bool $replace true to replace the URLs in the given input with
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* the @contexts from the urls map, false not to.
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* @param string $base the base URL to resolve relative URLs with.
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*/
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protected function _findContextUrls($input, $urls, $replace) {
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protected function _findContextUrls($input, $urls, $replace, $base) {
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if(is_array($input)) {
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foreach($input as $e) {
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$this->_findContextUrls($e, $urls, $replace);
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$this->_findContextUrls($e, $urls, $replace, $base);
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}
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}
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else if(is_object($input)) {
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foreach($input as $k => &$v) {
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if($k !== '@context') {
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$this->_findContextUrls($v, $urls, $replace);
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$this->_findContextUrls($v, $urls, $replace, $base);
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continue;
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}
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@ -3554,7 +3621,7 @@ class JsonLdProcessor {
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$length = count($v);
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for($i = 0; $i < $length; ++$i) {
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if(is_string($v[$i])) {
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$url = $v[$i];
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$url = jsonld_to_absolute_url($v[$i], $base);
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// replace w/@context if requested
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if($replace) {
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$ctx = $urls->{$url};
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@ -3577,6 +3644,7 @@ class JsonLdProcessor {
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}
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// string @context
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else if(is_string($v)) {
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$v = jsonld_to_absolute_url($v, $base);
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// replace w/@context if requested
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if($replace) {
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$input->{$k} = $urls->{$v};
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@ -3598,10 +3666,12 @@ class JsonLdProcessor {
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* @param mixed $input the JSON-LD input with possible contexts.
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* @param stdClass $cycles an object for tracking context cycles.
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* @param callable $resolver(url) the URL resolver.
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* @param base $base the base URL to resolve relative URLs against.
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*
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* @return mixed the result.
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*/
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protected function _resolveContextUrls(&$input, $cycles, $resolver) {
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protected function _resolveContextUrls(
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&$input, $cycles, $resolver, $base='') {
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if(count(get_object_vars($cycles)) > self::MAX_CONTEXT_URLS) {
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throw new JsonLdException(
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'Maximum number of @context URLs exceeded.',
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@ -3612,17 +3682,12 @@ class JsonLdProcessor {
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$urls = new stdClass();
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// find all URLs in the given input
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$this->_findContextUrls($input, $urls, false);
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$this->_findContextUrls($input, $urls, false, $base);
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// queue all unresolved URLs
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$queue = array();
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foreach($urls as $url => $ctx) {
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if($ctx === false) {
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// validate URL
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if(filter_var($url, FILTER_VALIDATE_URL) === false) {
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throw new JsonLdException(
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'Malformed URL.', 'jsonld.InvalidUrl', array('url' => $url));
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}
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$queue[] = $url;
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}
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}
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@ -3684,12 +3749,12 @@ class JsonLdProcessor {
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}
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// recurse
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$this->_resolveContextUrls($ctx, $_cycles, $resolver);
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$this->_resolveContextUrls($ctx, $_cycles, $resolver, $url);
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$urls->{$url} = $ctx->{'@context'};
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}
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// replace all URLS in the input
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$this->_findContextUrls($input, $urls, true);
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$this->_findContextUrls($input, $urls, true, $base);
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}
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/**
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@ -3701,19 +3766,7 @@ class JsonLdProcessor {
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* @return string the absolute IRI.
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*/
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protected function _prependBase($base, $iri) {
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if($iri === '' || strpos($iri, '#') === 0) {
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return "$base$iri";
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}
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else {
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// prepend last directory for base
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$idx = strrpos($base, '/');
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if($idx === false) {
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return $iri;
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}
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else {
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return substr($base, 0, $idx + 1) . $iri;
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}
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}
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return jsonld_prepend_base($base, $iri);
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}
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/**
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