Correct format for id & $ref in draft-03/04 meta-schemas

See json-schema-org/JSON-Schema-Test-Suite#177 (comment)

Author: erayd

src/JsonSchema/SchemaStorage.php

@@ -51,6 +51,18 @@ public function addSchema($id, $schema = null)
             // schemas do not have an associated URI when passed via Validator::validate().
             $schema = $this->uriRetriever->retrieve($id);
         }
+
+        // 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';
+            }
+        }
+
         $objectIterator = new ObjectIterator($schema);
         foreach ($objectIterator as $toResolveSchema) {
             if (property_exists($toResolveSchema, '$ref') && is_string($toResolveSchema->{'$ref'})) {

tests/SchemaStorageTest.php

@@ -289,4 +289,17 @@ public function testGetUriResolver()
         $s->addSchema('http://json-schema.org/draft-04/schema#');
         $this->assertInstanceOf('\JsonSchema\Uri\UriResolver', $s->getUriResolver());
     }
+
+    public function testMetaSchemaFixes()
+    {
+        $s = new SchemaStorage();
+        $s->addSchema('http://json-schema.org/draft-03/schema#');
+        $s->addSchema('http://json-schema.org/draft-04/schema#');
+        $draft_03 = $s->getSchema('http://json-schema.org/draft-03/schema#');
+        $draft_04 = $s->getSchema('http://json-schema.org/draft-04/schema#');
+
+        $this->assertEquals('uri-reference', $draft_03->properties->id->format);
+        $this->assertEquals('uri-reference', $draft_03->properties->{'$ref'}->format);
+        $this->assertEquals('uri-reference', $draft_04->properties->id->format);
+    }
 }