Add support for allOf, anyOf, and oneOf

Author: impl

example.go

@@ -100,6 +100,35 @@ func OpenAPIExample(mode Mode, schema *openapi3.Schema) (interface{}, error) {
 		return ex, nil
 	}
 
+	// Handle combining keywords
+	if len(schema.OneOf) > 0 {
+		return OpenAPIExample(mode, schema.OneOf[0].Value)
+	}
+	if len(schema.AnyOf) > 0 {
+		return OpenAPIExample(mode, schema.AnyOf[0].Value)
+	}
+	if len(schema.AllOf) > 0 {
+		example := map[string]interface{}{}
+
+		for _, allOf := range schema.AllOf {
+			candidate, err := OpenAPIExample(mode, allOf.Value)
+			if err != nil {
+				return nil, err
+			}
+
+			value, ok := candidate.(map[string]interface{})
+			if !ok {
+				return nil, ErrNoExample
+			}
+
+			for k, v := range value {
+				example[k] = v
+			}
+		}
+
+		return example, nil
+	}
+
 	switch {
 	case schema.Type == "boolean":
 		return true, nil

example_test.go

@@ -417,6 +417,67 @@ var schemaTests = []struct {
 		}`,
 		`{"normal": "string", "readOnly": "string"}`,
 	},
+	// ----- Combination keywords -----
+	{
+		"Combine with allOf",
+		`{
+			"allOf": [
+				{
+					"type": "object",
+					"properties": {
+						"foo": {"type": "string"}
+					}
+				},
+				{
+					"type": "object",
+					"properties": {
+						"bar": {"type": "boolean"}
+					}
+				}
+			]
+		}`,
+		`{"foo": "string", "bar": true}`,
+	},
+	{
+		"Combine with anyOf",
+		`{
+			"anyOf": [
+				{
+					"type": "object",
+					"properties": {
+						"foo": {"type": "string"}
+					}
+				},
+				{
+					"type": "object",
+					"properties": {
+						"bar": {"type": "boolean"}
+					}
+				}
+			]
+		}`,
+		`{"foo": "string"}`,
+	},
+	{
+		"Combine with oneOf",
+		`{
+			"oneOf": [
+				{
+					"type": "object",
+					"properties": {
+						"foo": {"type": "string"}
+					}
+				},
+				{
+					"type": "object",
+					"properties": {
+						"bar": {"type": "boolean"}
+					}
+				}
+			]
+		}`,
+		`{"foo": "string"}`,
+	},
 }
 
 func TestGenExample(t *testing.T) {

go.mod

@@ -3,7 +3,6 @@ module github.com/danielgtaylor/apisprout
 go 1.12
 
 require (
-	github.com/davecgh/go-spew v1.1.1
 	github.com/fsnotify/fsnotify v1.4.7
 	github.com/getkin/kin-openapi v0.2.0
 	github.com/gobwas/glob v0.2.3