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Edit File: SchemaStorage.php

<?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;
    }
}