support for "deprecated" directive on enum values

graphql_test.go

@@ -519,6 +519,50 @@ func TestDeprecatedDirective(t *testing.T) {
 				}
 			`,
 		},
+		{
+			Schema: graphql.MustParseSchema(`
+				schema {
+					query: Query
+				}
+
+				type Query {
+				}
+
+				enum Test {
+					A
+					B @deprecated
+					C @deprecated(reason: "We don't like it")
+				}
+			`, &testDeprecatedDirectiveResolver{}),
+			Query: `
+				{
+					__type(name: "Test") {
+						enumValues {
+							name
+						}
+						allEnumValues: enumValues(includeDeprecated: true) {
+							name
+							isDeprecated
+							deprecationReason
+						}
+					}
+				}
+			`,
+			ExpectedResult: `
+				{
+					"__type": {
+						"enumValues": [
+							{ "name": "A" }
+						],
+						"allEnumValues": [
+							{ "name": "A", "isDeprecated": false, "deprecationReason": null },
+							{ "name": "B", "isDeprecated": true, "deprecationReason": "No longer supported" },
+							{ "name": "C", "isDeprecated": true, "deprecationReason": "We don't like it" }
+						]
+					}
+				}
+			`,
+		},
 	})
 }
 

internal/schema/schema.go

@@ -18,6 +18,7 @@ type Schema struct {
 	entryPointNames map[string]string
 	objects         []*Object
 	unions          []*Union
+	enums           []*Enum
 }
 
 func (s *Schema) Resolve(name string) common.Type {
@@ -68,8 +69,9 @@ type Enum struct {
 }
 
 type EnumValue struct {
-	Name string
-	Desc string
+	Name       string
+	Directives map[string]common.DirectiveArgs
+	Desc       string
 }
 
 type InputObject struct {
@@ -208,6 +210,14 @@ func (s *Schema) Parse(schemaString string) error {
 		}
 	}
 
+	for _, enum := range s.enums {
+		for _, value := range enum.Values {
+			if err := resolveDirectives(s, value.Directives); err != nil {
+				return err
+			}
+		}
+	}
+
 	return nil
 }
 
@@ -239,7 +249,14 @@ func resolveField(s *Schema, f *Field) error {
 		return err
 	}
 	f.Type = t
-	for name, args := range f.Directives {
+	if err := resolveDirectives(s, f.Directives); err != nil {
+		return err
+	}
+	return resolveInputObject(s, &f.Args)
+}
+
+func resolveDirectives(s *Schema, directives map[string]common.DirectiveArgs) error {
+	for name, args := range directives {
 		d, ok := s.Directives[name]
 		if !ok {
 			return errors.Errorf("directive %q not found", name)
@@ -255,7 +272,7 @@ func resolveField(s *Schema, f *Field) error {
 			}
 		}
 	}
-	return resolveInputObject(s, &f.Args)
+	return nil
 }
 
 func resolveInputObject(s *Schema, io *common.InputMap) error {
@@ -300,6 +317,7 @@ func parseSchema(s *Schema, l *lexer.Lexer) {
 			enum := parseEnumDecl(l)
 			enum.Desc = desc
 			s.Types[enum.Name] = enum
+			s.enums = append(s.enums, enum)
 		case "input":
 			input := parseInputDecl(l)
 			input.Desc = desc
@@ -378,6 +396,7 @@ func parseEnumDecl(l *lexer.Lexer) *Enum {
 		v := &EnumValue{}
 		v.Desc = l.DescComment()
 		v.Name = l.ConsumeIdent()
+		v.Directives = common.ParseDirectives(l)
 		enum.Values = append(enum.Values, v)
 	}
 	l.ConsumeToken('}')

introspection/introspection.go

@@ -162,9 +162,11 @@ func (r *Type) EnumValues(args *struct{ IncludeDeprecated bool }) *[]*EnumValue
 		return nil
 	}
 
-	l := make([]*EnumValue, len(t.Values))
-	for i, v := range t.Values {
-		l[i] = &EnumValue{v}
+	var l []*EnumValue
+	for _, v := range t.Values {
+		if _, ok := v.Directives["deprecated"]; !ok || args.IncludeDeprecated {
+			l = append(l, &EnumValue{v})
+		}
 	}
 	return &l
 }
@@ -277,11 +279,17 @@ func (r *EnumValue) Description() *string {
 }
 
 func (r *EnumValue) IsDeprecated() bool {
-	return false
+	_, ok := r.value.Directives["deprecated"]
+	return ok
 }
 
 func (r *EnumValue) DeprecationReason() *string {
-	return nil
+	args, ok := r.value.Directives["deprecated"]
+	if !ok {
+		return nil
+	}
+	reason := args["reason"].(string)
+	return &reason
 }
 
 type Directive struct {