Implement parseLiteral for Blob

Author: TomHAnderson

src/Type/Blob.php

@@ -6,6 +6,7 @@
 
 use GraphQL\Error\Error;
 use GraphQL\Language\AST\Node as ASTNode;
+use GraphQL\Language\AST\StringValueNode;
 use GraphQL\Type\Definition\ScalarType;
 
 use function base64_decode;
@@ -23,7 +24,14 @@ class Blob extends ScalarType
 
     public function parseLiteral(ASTNode $valueNode, array|null $variables = null): string
     {
-        throw new Error('Blob fields cannot be parsed literally.', $valueNode);
+        // @codeCoverageIgnoreStart
+        if (! $valueNode instanceof StringValueNode) {
+            throw new Error('Query error: Can only parse strings got: ' . $valueNode->kind, $valueNode);
+        }
+
+        // @codeCoverageIgnoreEnd
+
+        return $this->parseValue($valueNode->value);
     }
 
     public function parseValue(mixed $value): mixed

test/Feature/Type/BlobTest.php

@@ -55,12 +55,15 @@ public function testParseValueInvalid(): void
 
     public function testParseLiteral(): void
     {
-        $this->expectException(Error::class);
+        $jsonType = new Blob();
+        $file     = file_get_contents(__DIR__ . '/../../../docs/banner.png');
+        $encoded  = base64_encode($file);
 
-        $jsonType    = new Blob();
         $node        = new StringValueNode([]);
-        $node->value = 'search string';
+        $node->value = $encoded;
         $result      = $jsonType->parseLiteral($node);
+
+        $this->assertEquals($file, $result);
     }
 
     public function testSerialize(): void