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<?php
namespace JsonSchema;
use JsonSchema\Constraints\BaseConstraint;
use JsonSchema\Entity\JsonPointer;
use JsonSchema\Exception\UnresolvableJsonPointerException;
use JsonSchema\Uri\UriResolver;
use JsonSchema\Uri\UriRetriever;
class SchemaStorage implements SchemaStorageInterface
{
const INTERNAL_PROVIDED_SCHEMA_URI = 'internal://provided-schema/';
protected $uriRetriever;
protected $uriResolver;
protected $schemas = array();
public function __construct(
UriRetrieverInterface $uriRetriever = null,
UriResolverInterface $uriResolver = null
) {
$this->uriRetriever = $uriRetriever ?: new UriRetriever();
$this->uriResolver = $uriResolver ?: new UriResolver();
}
/**
* @return UriRetrieverInterface
*/
public function getUriRetriever()
{
return $this->uriRetriever;
}
/**
* @return UriResolverInterface
*/
public function getUriResolver()
{
return $this->uriResolver;
}
/**
* {@inheritdoc}
*/
public function addSchema($id, $schema = null)
{
if (is_null($schema) && $id !== self::INTERNAL_PROVIDED_SCHEMA_URI) {
// if the schema was user-provided to Validator and is still null, then assume this is
// what the user intended, as there's no way for us to retrieve anything else. User-supplied
// schemas do not have an associated URI when passed via Validator::validate().
$schema = $this->uriRetriever->retrieve($id);
}
// cast array schemas to object
if (is_array($schema)) {
$schema = BaseConstraint::arrayToObjectRecursive($schema);
}
// workaround for bug in draft-03 & draft-04 meta-schemas (id & $ref defined with incorrect format)
// see https://github.com/json-schema-org/JSON-Schema-Test-Suite/issues/177#issuecomment-293051367
if (is_object($schema) && property_exists($schema, 'id')) {
if ($schema->id == 'http://json-schema.org/draft-04/schema#') {
$schema->properties->id->format = 'uri-reference';
} elseif ($schema->id == 'http://json-schema.org/draft-03/schema#') {
$schema->properties->id->format = 'uri-reference';
$schema->properties->{'$ref'}->format = 'uri-reference';
}
}
// resolve references
$this->expandRefs($schema, $id);
$this->schemas[$id] = $schema;
}
/**
* Recursively resolve all references against the provided base
*
* @param mixed $schema
* @param string $base
*/
private function expandRefs(&$schema, $base = null)
{
if (!is_object($schema)) {
if (is_array($schema)) {
foreach ($schema as &$member) {
$this->expandRefs($member, $base);
}
}
return;
}
if (property_exists($schema, 'id') && is_string($schema->id) && $base != $schema->id) {
$base = $this->uriResolver->resolve($schema->id, $base);
}
if (property_exists($schema, '$ref') && is_string($schema->{'$ref'})) {
$refPointer = new JsonPointer($this->uriResolver->resolve($schema->{'$ref'}, $base));
$schema->{'$ref'} = (string) $refPointer;
}
foreach ($schema as &$member) {
$this->expandRefs($member, $base);
}
}
/**
* {@inheritdoc}
*/
public function getSchema($id)
{
if (!array_key_exists($id, $this->schemas)) {
$this->addSchema($id);
}
return $this->schemas[$id];
}
/**
* {@inheritdoc}
*/
public function resolveRef($ref)
{
$jsonPointer = new JsonPointer($ref);
// resolve filename for pointer
$fileName = $jsonPointer->getFilename();
if (!strlen($fileName)) {
throw new UnresolvableJsonPointerException(sprintf(
"Could not resolve fragment '%s': no file is defined",
$jsonPointer->getPropertyPathAsString()
));
}
// get & process the schema
$refSchema = $this->getSchema($fileName);
foreach ($jsonPointer->getPropertyPaths() as $path) {
if (is_object($refSchema) && property_exists($refSchema, $path)) {
$refSchema = $this->resolveRefSchema($refSchema->{$path});
} elseif (is_array($refSchema) && array_key_exists($path, $refSchema)) {
$refSchema = $this->resolveRefSchema($refSchema[$path]);
} else {
throw new UnresolvableJsonPointerException(sprintf(
'File: %s is found, but could not resolve fragment: %s',
$jsonPointer->getFilename(),
$jsonPointer->getPropertyPathAsString()
));
}
}
return $refSchema;
}
/**
* {@inheritdoc}
*/
public function resolveRefSchema($refSchema)
{
if (is_object($refSchema) && property_exists($refSchema, '$ref') && is_string($refSchema->{'$ref'})) {
$newSchema = $this->resolveRef($refSchema->{'$ref'});
$refSchema = (object) (get_object_vars($refSchema) + get_object_vars($newSchema));
unset($refSchema->{'$ref'});
}
return $refSchema;
}
}