Adds Custom Validation Rules

Sources/GraphQL/Type/Definition.swift

@@ -414,7 +414,8 @@ func defineArgumentMap(args: GraphQLArgumentConfigMap) throws -> [GraphQLArgumen
             name: name,
             type: config.type,
             defaultValue: config.defaultValue,
-            description: config.description
+            description: config.description,
+            deprecationReason: config.deprecationReason
         )
         arguments.append(argument)
     }
@@ -661,15 +662,18 @@ public struct GraphQLArgument {
     public let type: GraphQLInputType
     public let description: String?
     public let defaultValue: Map?
+    public let deprecationReason: String?
 
     public init(
         type: GraphQLInputType,
         description: String? = nil,
-        defaultValue: Map? = nil
+        defaultValue: Map? = nil,
+        deprecationReason: String? = nil
     ) {
         self.type = type
         self.description = description
         self.defaultValue = defaultValue
+        self.deprecationReason = deprecationReason
     }
 }
 
@@ -678,17 +682,20 @@ public struct GraphQLArgumentDefinition {
     public let type: GraphQLInputType
     public let defaultValue: Map?
     public let description: String?
+    public let deprecationReason: String?
 
     init(
         name: String,
         type: GraphQLInputType,
         defaultValue: Map? = nil,
-        description: String? = nil
+        description: String? = nil,
+        deprecationReason: String? = nil
     ) {
         self.name = name
         self.type = type
         self.defaultValue = defaultValue
         self.description = description
+        self.deprecationReason = deprecationReason
     }
 }
 
@@ -702,6 +709,7 @@ extension GraphQLArgumentDefinition: Encodable {
         case description
         case type
         case defaultValue
+        case deprecationReason
     }
 
     public func encode(to encoder: Encoder) throws {
@@ -710,6 +718,7 @@ extension GraphQLArgumentDefinition: Encodable {
         try container.encode(description, forKey: .description)
         try container.encode(AnyEncodable(type), forKey: .type)
         try container.encode(defaultValue, forKey: .defaultValue)
+        try container.encode(deprecationReason, forKey: .deprecationReason)
     }
 }
 
@@ -724,6 +733,8 @@ extension GraphQLArgumentDefinition: KeySubscriptable {
             return type
         case CodingKeys.defaultValue.rawValue:
             return defaultValue
+        case CodingKeys.deprecationReason.rawValue:
+            return deprecationReason
         default:
             return nil
         }
@@ -1292,7 +1303,8 @@ func defineInputObjectFieldMap(
             name: name,
             type: field.type,
             description: field.description,
-            defaultValue: field.defaultValue
+            defaultValue: field.defaultValue,
+            deprecationReason: field.deprecationReason
         )
 
         definitionMap[name] = definition
@@ -1305,11 +1317,18 @@ public struct InputObjectField {
     public let type: GraphQLInputType
     public let defaultValue: Map?
     public let description: String?
+    public let deprecationReason: String?
 
-    public init(type: GraphQLInputType, defaultValue: Map? = nil, description: String? = nil) {
+    public init(
+        type: GraphQLInputType,
+        defaultValue: Map? = nil,
+        description: String? = nil,
+        deprecationReason: String? = nil
+    ) {
         self.type = type
         self.defaultValue = defaultValue
         self.description = description
+        self.deprecationReason = deprecationReason
     }
 }
 
@@ -1320,17 +1339,20 @@ public final class InputObjectFieldDefinition {
     public internal(set) var type: GraphQLInputType
     public let description: String?
     public let defaultValue: Map?
+    public let deprecationReason: String?
 
     init(
         name: String,
         type: GraphQLInputType,
         description: String? = nil,
-        defaultValue: Map? = nil
+        defaultValue: Map? = nil,
+        deprecationReason: String? = nil
     ) {
         self.name = name
         self.type = type
         self.description = description
         self.defaultValue = defaultValue
+        self.deprecationReason = deprecationReason
     }
 
     func replaceTypeReferences(typeMap: TypeMap) throws {
@@ -1352,6 +1374,7 @@ extension InputObjectFieldDefinition: Encodable {
         case description
         case type
         case defaultValue
+        case deprecationReason
     }
 
     public func encode(to encoder: Encoder) throws {
@@ -1360,6 +1383,7 @@ extension InputObjectFieldDefinition: Encodable {
         try container.encode(description, forKey: .description)
         try container.encode(AnyEncodable(type), forKey: .type)
         try container.encode(defaultValue, forKey: .defaultValue)
+        try container.encode(deprecationReason, forKey: .deprecationReason)
     }
 }
 
@@ -1374,6 +1398,8 @@ extension InputObjectFieldDefinition: KeySubscriptable {
             return type
         case CodingKeys.defaultValue.rawValue:
             return defaultValue
+        case CodingKeys.deprecationReason.rawValue:
+            return deprecationReason
         default:
             return nil
         }

Sources/GraphQL/Type/Directives.swift

@@ -105,6 +105,8 @@ public let GraphQLDeprecatedDirective = try! GraphQLDirective(
     "Marks an element of a GraphQL schema as no longer supported.",
     locations: [
         .fieldDefinition,
+        .argumentDefinition,
+        .inputFieldDefinition,
         .enumValue,
     ],
     args: [

Sources/GraphQL/Type/Introspection.swift

@@ -476,3 +476,18 @@ let TypeNameMetaFieldDef = GraphQLFieldDefinition(
         eventLoopGroup.next().makeSucceededFuture(info.parentType.name)
     }
 )
+
+let introspectionTypeNames = [
+    __Schema.name,
+    __Directive.name,
+    __DirectiveLocation.name,
+    __Type.name,
+    __Field.name,
+    __InputValue.name,
+    __EnumValue.name,
+    __TypeKind.name,
+]
+
+func isIntrospectionType(type: GraphQLNamedType) -> Bool {
+    return introspectionTypeNames.contains(type.name)
+}

Sources/GraphQL/Validation/Rules/Custom/NoDeprecatedCustomRule.swift

@@ -0,0 +1,87 @@
+
+/**
+ * No deprecated
+ *
+ * A GraphQL document is only valid if all selected fields and all used enum values have not been
+ * deprecated.
+ *
+ * Note: This rule is optional and is not part of the Validation section of the GraphQL
+ * Specification. The main purpose of this rule is detection of deprecated usages and not
+ * necessarily to forbid their use when querying a service.
+ */
+public func NoDeprecatedCustomRule(context: ValidationContext) -> Visitor {
+    return Visitor(
+        enter: { node, _, _, _, _ in
+            if let node = node as? Field {
+                if
+                    let fieldDef = context.fieldDef,
+                    let deprecationReason = fieldDef.deprecationReason,
+                    let parentType = context.parentType
+                {
+                    context.report(
+                        error: GraphQLError(
+                            message: "The field \(parentType.name).\(fieldDef.name) is deprecated. \(deprecationReason)",
+                            nodes: [node]
+                        )
+                    )
+                }
+            }
+            if let node = node as? Argument {
+                if
+                    let argDef = context.argument,
+                    let deprecationReason = argDef.deprecationReason
+                {
+                    if let directiveDef = context.typeInfo.directive {
+                        context.report(
+                            error: GraphQLError(
+                                message: "Directive \"@\(directiveDef.name)\" argument \"\(argDef.name)\" is deprecated. \(deprecationReason)",
+                                nodes: [node]
+                            )
+                        )
+                    } else if
+                        let fieldDef = context.fieldDef,
+                        let parentType = context.parentType
+                    {
+                        context.report(
+                            error: GraphQLError(
+                                message: "Field \"\(parentType.name).\(fieldDef.name)\" argument \"\(argDef.name)\" is deprecated. \(deprecationReason)",
+                                nodes: [node]
+                            )
+                        )
+                    }
+                }
+            }
+            if let node = node as? ObjectField {
+                let inputObjectDef = context.parentInputType as? GraphQLInputObjectType
+
+                if
+                    let inputObjectDef = context.parentInputType as? GraphQLInputObjectType,
+                    let inputFieldDef = inputObjectDef.fields[node.name.value],
+                    let deprecationReason = inputFieldDef.deprecationReason
+                {
+                    context.report(
+                        error: GraphQLError(
+                            message: "The input field \(inputObjectDef.name).\(inputFieldDef.name) is deprecated. \(deprecationReason)",
+                            nodes: [node]
+                        )
+                    )
+                }
+            }
+            if let node = node as? EnumValue {
+                if
+                    let enumValueDef = context.typeInfo.enumValue,
+                    let deprecationReason = enumValueDef.deprecationReason,
+                    let enumTypeDef = getNamedType(type: context.inputType)
+                {
+                    context.report(
+                        error: GraphQLError(
+                            message: "The enum value \"\(enumTypeDef.name).\(enumValueDef.name)\" is deprecated. \(deprecationReason)",
+                            nodes: [node]
+                        )
+                    )
+                }
+            }
+            return .continue
+        }
+    )
+}

Sources/GraphQL/Validation/Rules/Custom/NoSchemaIntrospectionCustomRule.swift

@@ -0,0 +1,31 @@
+
+/**
+ * Prohibit introspection queries
+ *
+ * A GraphQL document is only valid if all fields selected are not fields that
+ * return an introspection type.
+ *
+ * Note: This rule is optional and is not part of the Validation section of the
+ * GraphQL Specification. This rule effectively disables introspection, which
+ * does not reflect best practices and should only be done if absolutely necessary.
+ */
+public func NoSchemaIntrospectionCustomRule(context: ValidationContext) -> Visitor {
+    return Visitor(
+        enter: { node, _, _, _, _ in
+            if let node = node as? Field {
+                if
+                    let type = getNamedType(type: context.type),
+                    isIntrospectionType(type: type)
+                {
+                    context.report(
+                        error: GraphQLError(
+                            message: "GraphQL introspection has been disabled, but the requested query contained the field \(node.name.value)",
+                            nodes: [node]
+                        )
+                    )
+                }
+            }
+            return .continue
+        }
+    )
+}