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php-json-ld
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Add relative @context URL resolution.

This commit is contained in:
Dave Longley 2012-10-09 13:17:25 -04:00
parent ef8769fe5a
commit 7b20e349af
1 changed files with 84 additions and 31 deletions
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115
jsonld.php
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@ -214,7 +214,71 @@ function jsonld_unregister_rdf_parser($content_type) {
if(property_exists($jsonld_rdf_parsers, $content_type)) {
unset($jsonld_rdf_parsers->{$content_type});
}
}
}
/**
* Converts a relative path into an absolute URL.
*
* @param string $path the relative path.
* @param string $url the absolute URL base.
*
* @return string the absolute URL for the given relative path.
*/
function jsonld_to_absolute_url($path, $url) {
// validate path (it may already be an absolute URL)
if(filter_var($path, FILTER_VALIDATE_URL) === false) {
$url = parse_url($url);
$rval = "{$url['scheme']}://";
if(isset($url['user']) || isset($url['pass'])) {
$rval .= "{$url['user']}:{$url['pass']}@";
}
$rval .= $url['host'];
if(isset($url['port'])) {
$rval .= ":{$url['port']}";
}
$rval .= jsonld_prepend_base($url['path'], $path);
if(strrpos($rval, '?') === false && isset($url['query'])) {
$rval .= "?{$url['query']}";
}
if(strrpos($rval, '#') === false && isset($url['fragment'])) {
$rval .= "#{$url['fragment']}";
}
}
else {
$rval = $path;
}
// validate result
if(filter_var($rval, FILTER_VALIDATE_URL) === false) {
throw new JsonLdException(
'Malformed URL.', 'jsonld.InvalidUrl', array('url' => $rval));
}
return $rval;
}
/**
* Prepend a relative IRI to a base IRI.
*
* @param string $base the base IRI.
* @param string $iri the relative IRI.
*/
function jsonld_prepend_base($base, $iri) {
if($iri === '' || strpos($iri, '#') === 0) {
return "$base$iri";
}
// prepend last directory for base
$idx = strrpos($base, '/');
if($idx === false) {
return $iri;
}
return substr($base, 0, $idx + 1) . $iri;
}
/**
* A JSON-LD processor.
@ -376,7 +440,8 @@ class JsonLdProcessor {
// resolve all @context URLs in the input
$input = self::copy($input);
try {
$this->_resolveContextUrls($input, new stdClass(), $options['resolver']);
$this->_resolveContextUrls(
$input, new stdClass(), $options['resolver'], $options['base']);
}
catch(Exception $e) {
throw new JsonLdException(
@ -627,7 +692,8 @@ class JsonLdProcessor {
$ctx = (object)array('@context' => $ctx);
}
try {
$this->_resolveContextUrls($ctx, new stdClass(), $options['resolver']);
$this->_resolveContextUrls(
$ctx, new stdClass(), $options['resolver'], $options['base']);
}
catch(Exception $e) {
throw new JsonLdException(
@ -3534,18 +3600,19 @@ class JsonLdProcessor {
* @param mixed $input the JSON-LD input.
* @param stdClass $urls a map of URLs (url => false/@contexts).
* @param bool $replace true to replace the URLs in the given input with
* the @contexts from the urls map, false not to.
* the @contexts from the urls map, false not to.
* @param string $base the base URL to resolve relative URLs with.
*/
protected function _findContextUrls($input, $urls, $replace) {
protected function _findContextUrls($input, $urls, $replace, $base) {
if(is_array($input)) {
foreach($input as $e) {
$this->_findContextUrls($e, $urls, $replace);
$this->_findContextUrls($e, $urls, $replace, $base);
}
}
else if(is_object($input)) {
foreach($input as $k => &$v) {
if($k !== '@context') {
$this->_findContextUrls($v, $urls, $replace);
$this->_findContextUrls($v, $urls, $replace, $base);
continue;
}
@ -3554,7 +3621,7 @@ class JsonLdProcessor {
$length = count($v);
for($i = 0; $i < $length; ++$i) {
if(is_string($v[$i])) {
$url = $v[$i];
$url = jsonld_to_absolute_url($v[$i], $base);
// replace w/@context if requested
if($replace) {
$ctx = $urls->{$url};
@ -3576,7 +3643,8 @@ class JsonLdProcessor {
}
}
// string @context
else if(is_string($v)) {
else if(is_string($v)) {
$v = jsonld_to_absolute_url($v, $base);
// replace w/@context if requested
if($replace) {
$input->{$k} = $urls->{$v};
@ -3598,10 +3666,12 @@ class JsonLdProcessor {
* @param mixed $input the JSON-LD input with possible contexts.
* @param stdClass $cycles an object for tracking context cycles.
* @param callable $resolver(url) the URL resolver.
* @param base $base the base URL to resolve relative URLs against.
*
* @return mixed the result.
*/
protected function _resolveContextUrls(&$input, $cycles, $resolver) {
protected function _resolveContextUrls(
&$input, $cycles, $resolver, $base='') {
if(count(get_object_vars($cycles)) > self::MAX_CONTEXT_URLS) {
throw new JsonLdException(
'Maximum number of @context URLs exceeded.',
@ -3612,17 +3682,12 @@ class JsonLdProcessor {
$urls = new stdClass();
// find all URLs in the given input
$this->_findContextUrls($input, $urls, false);
$this->_findContextUrls($input, $urls, false, $base);
// queue all unresolved URLs
$queue = array();
foreach($urls as $url => $ctx) {
if($ctx === false) {
// validate URL
if(filter_var($url, FILTER_VALIDATE_URL) === false) {
throw new JsonLdException(
'Malformed URL.', 'jsonld.InvalidUrl', array('url' => $url));
}
$queue[] = $url;
}
}
@ -3684,12 +3749,12 @@ class JsonLdProcessor {
}
// recurse
$this->_resolveContextUrls($ctx, $_cycles, $resolver);
$this->_resolveContextUrls($ctx, $_cycles, $resolver, $url);
$urls->{$url} = $ctx->{'@context'};
}
// replace all URLS in the input
$this->_findContextUrls($input, $urls, true);
$this->_findContextUrls($input, $urls, true, $base);
}
/**
@ -3701,19 +3766,7 @@ class JsonLdProcessor {
* @return string the absolute IRI.
*/
protected function _prependBase($base, $iri) {
if($iri === '' || strpos($iri, '#') === 0) {
return "$base$iri";
}
else {
// prepend last directory for base
$idx = strrpos($base, '/');
if($idx === false) {
return $iri;
}
else {
return substr($base, 0, $idx + 1) . $iri;
}
}
return jsonld_prepend_base($base, $iri);
}
/**