Add provided schema under a dummy / internal URI (fixes jsonrainbow#376)

In order to resolve internal $ref references within a user-provided
schema, SchemaStorage needs to know about the schema. As user-supplied
schemas do not have an associated URI, use a dummy / internal one instead.

src/JsonSchema/SchemaStorage.php

@@ -3,6 +3,7 @@
 namespace JsonSchema;
 
 use JsonSchema\Entity\JsonPointer;
+use JsonSchema\Exception\InvalidArgumentException;
 use JsonSchema\Exception\UnresolvableJsonPointerException;
 use JsonSchema\Iterator\ObjectIterator;
 use JsonSchema\Uri\UriResolver;
@@ -43,7 +44,10 @@ public function getUriResolver()
      */
     public function addSchema($id, $schema = null)
     {
-        if (is_null($schema)) {
+        if (is_null($schema) && $id !== 'internal://provided-schema') {
+            // 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);
         }
         $objectIterator = new ObjectIterator($schema);

src/JsonSchema/Validator.php

@@ -41,6 +41,9 @@ public function validate(&$value, $schema = null, $checkMode = null)
             $this->factory->setConfig($checkMode);
         }
 
+        // add provided schema to SchemaStorage with internal URI to allow internal $ref resolution
+        $this->factory->getSchemaStorage()->addSchema('internal://provided-schema', $schema);
+
         $validator = $this->factory->createInstanceFor('schema');
         $validator->check($value, $schema);
 

tests/SchemaStorageTest.php

@@ -11,6 +11,7 @@
 
 use JsonSchema\SchemaStorage;
 use JsonSchema\Uri\UriRetriever;
+use JsonSchema\Validator;
 use Prophecy\Argument;
 
 class SchemaStorageTest extends \PHPUnit_Framework_TestCase
@@ -31,6 +32,15 @@ public function testResolveRef()
         );
     }
 
+    public function testResolveTopRef()
+    {
+        $input = json_decode('{"propertyOne":"notANumber"}');
+        $schema = json_decode('{"$ref":"#/definition","definition":{"properties":{"propertyOne":{"type":"number"}}}}');
+        $v = new Validator();
+        $v->validate($input, $schema);
+        $this->assertFalse($v->isValid());
+    }
+
     /**
      * @depends testResolveRef
      */