Version 4.5.0

system/3rd_party/graphql-php/Validator/Rules/UniqueDirectivesPerLocation.php

@@ -0,0 +1,38 @@
+<?php
+namespace GraphQL\Validator\Rules;
+
+use GraphQL\Error\Error;
+use GraphQL\Language\AST\DirectiveNode;
+use GraphQL\Language\AST\Node;
+use GraphQL\Validator\ValidationContext;
+
+class UniqueDirectivesPerLocation extends AbstractValidationRule
+{
+    static function duplicateDirectiveMessage($directiveName)
+    {
+        return 'The directive "'.$directiveName.'" can only be used once at this location.';
+    }
+
+    public function getVisitor(ValidationContext $context)
+    {
+        return [
+            'enter' => function(Node $node) use ($context) {
+                if (isset($node->directives)) {
+                    $knownDirectives = [];
+                    foreach ($node->directives as $directive) {
+                        /** @var DirectiveNode $directive */
+                        $directiveName = $directive->name->value;
+                        if (isset($knownDirectives[$directiveName])) {
+                            $context->reportError(new Error(
+                                self::duplicateDirectiveMessage($directiveName),
+                                [$knownDirectives[$directiveName], $directive]
+                            ));
+                        } else {
+                            $knownDirectives[$directiveName] = $directive;
+                        }
+                    }
+                }
+            }
+        ];
+    }
+}