forked from friendica/php-json-ld
Implement http link header processing w/default document loader.
- Use default document loader when testing remote documents.
This commit is contained in:
Dave Longley
parent
bf08dd1e3d
commit
d59ffc65bf
115
jsonld.php
115
jsonld.php
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@ -1,7 +1,7 @@
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<?php
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/**
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* PHP implementation of the JSON-LD API.
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* Version: 0.2.0
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* Version: 0.2.1
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*
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* @author Dave Longley
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*
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@ -233,7 +233,7 @@ $jsonld_cache->activeCtx = new ActiveContextCache();
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/** Stores the default JSON-LD document loader. */
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global $jsonld_default_load_document;
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$jsonld_default_load_document = null;
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$jsonld_default_load_document = 'jsonld_default_document_loader';
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/**
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* Sets the default JSON-LD document loader.
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@ -276,6 +276,8 @@ function jsonld_get_url($url) {
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* @return stdClass the RemoteDocument object.
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*/
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function jsonld_default_document_loader($url) {
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$doc = (object)array(
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'contextUrl' => null, 'document' => null, 'documentUrl' => $url);
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$redirects = array();
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$opts = array(
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@ -290,30 +292,61 @@ function jsonld_default_document_loader($url) {
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'header' =>
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"Accept: application/ld+json\r\n" .
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"User-Agent: JSON-LD PHP Client/1.0\r\n"));
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$stream = stream_context_create($opts);
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stream_context_set_params($stream, array('notification' =>
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function($notification_code, $severity, $message) use (&$redirects) {
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$context = stream_context_create($opts);
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$content_type = null;
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stream_context_set_params($context, array('notification' =>
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function($notification_code, $severity, $message) use (
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&$redirects, &$content_type) {
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switch($notification_code) {
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case STREAM_NOTIFY_REDIRECTED:
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$redirects[] = $message;
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break;
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case STREAM_NOTIFY_MIME_TYPE_IS:
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$content_type = $message;
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break;
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};
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}));
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$result = @file_get_contents($url, false, $stream);
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$result = @file_get_contents($url, false, $context);
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if($result === false) {
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throw new JsonLdException(
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'Could not retrieve a JSON-LD document from the URL.',
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'jsonld.LoadDocumentError', 'loading document failed');
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}
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$link_header = array();
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foreach($http_response_header as $header) {
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if(strpos($header, 'link') === 0) {
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$value = explode(': ', $header);
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if(count($value) > 1) {
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$link_header[] = $value[1];
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}
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}
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}
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$link_header = jsonld_parse_link_header(join(',', $link_header));
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if(isset($link_header['http://www.w3.org/ns/json-ld#context'])) {
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$link_header = $link_header['http://www.w3.org/ns/json-ld#context'];
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}
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else {
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$link_header = null;
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}
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if($link_header && $content_type !== 'application/ld+json') {
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// only 1 related link header permitted
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if(is_array($link_header)) {
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throw new JsonLdException(
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'URL could not be dereferenced, it has more than one ' .
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'associated HTTP Link Header.', 'jsonld.LoadDocumentError',
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'multiple context link headers', array('url' => $url));
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}
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$doc->{'contextUrl'} = $link_header->target;
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}
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// update document url based on redirects
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$redirs = count($redirects);
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if($redirs > 0) {
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$url = $redirects[$redirs - 1];
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}
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// return RemoteDocument
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return (object)array(
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'contextUrl' => null,
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'document' => $result,
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'documentUrl' => $url);
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$doc->document = $result;
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$doc->documentUrl = $url;
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return $doc;
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}
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/**
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@ -330,6 +363,8 @@ function jsonld_default_secure_document_loader($url) {
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'jsonld.LoadDocumentError', 'loading document failed');
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}
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$doc = (object)array(
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'contextUrl' => null, 'document' => null, 'documentUrl' => $url);
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$redirects = array();
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// default JSON-LD https GET implementation
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@ -340,21 +375,54 @@ function jsonld_default_secure_document_loader($url) {
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'header' =>
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"Accept: application/ld+json\r\n" .
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"User-Agent: JSON-LD PHP Client/1.0\r\n"));
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$stream = stream_context_create($opts);
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stream_context_set_params($stream, array('notification' =>
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function($notification_code, $severity, $message) use (&$redirects) {
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$context = stream_context_create($opts);
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$content_type = null;
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stream_context_set_params($context, array('notification' =>
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function($notification_code, $severity, $message) use (
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&$redirects, &$content_type) {
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switch($notification_code) {
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case STREAM_NOTIFY_REDIRECTED:
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$redirects[] = $message;
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break;
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case STREAM_NOTIFY_MIME_TYPE_IS:
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$content_type = $message;
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break;
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};
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}));
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$result = @file_get_contents($url, false, $stream);
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$result = @file_get_contents($url, false, $context);
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if($result === false) {
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throw new JsonLdException(
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'Could not retrieve a JSON-LD document from the URL.',
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'jsonld.LoadDocumentError', 'loading document failed');
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}
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$link_header = array();
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foreach($http_response_header as $header) {
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if(strpos($header, 'link') === 0) {
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$value = explode(': ', $header);
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if(count($value) > 1) {
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$link_header[] = $value[1];
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}
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}
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}
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$link_header = jsonld_parse_link_header(join(',', $link_header));
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if(isset($link_header['http://www.w3.org/ns/json-ld#context'])) {
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$link_header = $link_header['http://www.w3.org/ns/json-ld#context'];
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}
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else {
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$link_header = null;
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}
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if($link_header && $content_type !== 'application/ld+json') {
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// only 1 related link header permitted
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if(is_array($link_header)) {
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throw new JsonLdException(
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'URL could not be dereferenced, it has more than one ' .
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'associated HTTP Link Header.', 'jsonld.LoadDocumentError',
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'multiple context link headers', array('url' => $url));
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}
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$doc->{'contextUrl'} = $link_header->target;
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}
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// update document url based on redirects
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foreach($redirects as $redirect) {
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if(strpos($redirect, 'https') !== 0) {
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throw new JsonLdException(
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@ -363,11 +431,9 @@ function jsonld_default_secure_document_loader($url) {
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}
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$url = $redirect;
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}
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// return RemoteDocument
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return (object)array(
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'contextUrl' => null,
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'document' => $result,
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'documentUrl' => $url);
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$doc->document = $result;
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$doc->documentUrl = $url;
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return $doc;
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}
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/** Registered global RDF dataset parsers hashed by content-type. */
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@ -5514,7 +5580,11 @@ class JsonLdProcessor {
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*/
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protected static function _parse_json($json) {
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$rval = json_decode($json);
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switch(json_last_error()) {
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$error = json_last_error();
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if($error === JSON_ERROR_NONE && $rval === null) {
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$error = JSON_ERROR_SYNTAX;
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}
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switch($error) {
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case JSON_ERROR_NONE:
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break;
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case JSON_ERROR_DEPTH:
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@ -5561,6 +5631,9 @@ class JsonLdException extends Exception {
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}
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public function __toString() {
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$rval = __CLASS__ . ": [{$this->type}]: {$this->message}\n";
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if($this->code) {
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$rval .= 'Code: ' . $this->code . "\n";
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}
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if($this->details) {
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$rval .= 'Details: ' . print_r($this->details, true) . "\n";
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}
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21
test.php
21
test.php
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@ -286,9 +286,7 @@ class JsonLdTest {
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}
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public function createDocumentLoader() {
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global $jsonld_default_load_document;
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$base = 'http://json-ld.org/test-suite';
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$loader = $jsonld_default_load_document;
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$test = $this;
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$load_locally = function($url) use ($test, $base) {
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@ -314,8 +312,13 @@ class JsonLdTest {
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if(is_array($link_header)) {
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$link_header = join(',', $link_header);
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}
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$link_header = jsonld_parse_link_header(
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$link_header)['http://www.w3.org/ns/json-ld#context'] ?: null;
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$link_header = jsonld_parse_link_header($link_header);
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if(isset($link_header['http://www.w3.org/ns/json-ld#context'])) {
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$link_header = $link_header['http://www.w3.org/ns/json-ld#context'];
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}
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else {
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$link_header = null;
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}
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if($link_header && $content_type !== 'application/ld+json') {
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if(is_array($link_header)) {
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throw new Exception('multiple context link headers');
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@ -336,12 +339,12 @@ class JsonLdTest {
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return $doc;
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};
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$local_loader = function($url) use ($loader, $load_locally) {
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$local_loader = function($url) use ($test, $base, $load_locally) {
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// always load remote-doc and non-base tests remotely
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/*if(strpos($url, $base) !== 0 ||
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$test->manifest->data['name'] === 'Remote document') {
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return call_user_func($loader, $url);
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}*/
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if(strpos($url, $base) !== 0 ||
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$test->manifest->data->name === 'Remote document') {
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return call_user_func('jsonld_default_document_loader', $url);
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}
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// attempt to load locally
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return call_user_func($load_locally, $url);
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