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php-json-ld
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Implement http link header processing w/default document loader. 

- Use default document loader when testing remote documents.
This commit is contained in:
Dave Longley 2013-09-15 15:54:54 -04:00
parent bf08dd1e3d
commit d59ffc65bf
2 changed files with 107 additions and 31 deletions
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117
jsonld.php
View File

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

21
test.php
View File

@ -286,9 +286,7 @@ class JsonLdTest {
}
public function createDocumentLoader() {
global $jsonld_default_load_document;
$base = 'http://json-ld.org/test-suite';
$loader = $jsonld_default_load_document;
$test = $this;
$load_locally = function($url) use ($test, $base) {
@ -314,8 +312,13 @@ class JsonLdTest {
if(is_array($link_header)) {
$link_header = join(',', $link_header);
}
$link_header = jsonld_parse_link_header(
$link_header)['http://www.w3.org/ns/json-ld#context'] ?: null;
$link_header = jsonld_parse_link_header($link_header);
if(isset($link_header['http://www.w3.org/ns/json-ld#context'])) {
$link_header = $link_header['http://www.w3.org/ns/json-ld#context'];
}
else {
$link_header = null;
}
if($link_header && $content_type !== 'application/ld+json') {
if(is_array($link_header)) {
throw new Exception('multiple context link headers');
@ -336,12 +339,12 @@ class JsonLdTest {
return $doc;
};
$local_loader = function($url) use ($loader, $load_locally) {
$local_loader = function($url) use ($test, $base, $load_locally) {
// always load remote-doc and non-base tests remotely
/*if(strpos($url, $base) !== 0 ||
$test->manifest->data['name'] === 'Remote document') {
return call_user_func($loader, $url);
}*/
if(strpos($url, $base) !== 0 ||
$test->manifest->data->name === 'Remote document') {
return call_user_func('jsonld_default_document_loader', $url);
}
// attempt to load locally
return call_user_func($load_locally, $url);