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fuzzer.go
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fuzzer.go
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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fuzzer
import (
"reflect"
"strings"
"github.com/google/gofuzz"
"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
runtimeserializer "k8s.io/apimachinery/pkg/runtime/serializer"
)
// Funcs returns the fuzzer functions for the apiextensions apis.
func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
return []interface{}{
func(obj *apiextensions.CustomResourceDefinitionSpec, c fuzz.Continue) {
c.FuzzNoCustom(obj)
// match our defaulter
if len(obj.Scope) == 0 {
obj.Scope = apiextensions.NamespaceScoped
}
if len(obj.Names.Singular) == 0 {
obj.Names.Singular = strings.ToLower(obj.Names.Kind)
}
if len(obj.Names.ListKind) == 0 && len(obj.Names.Kind) > 0 {
obj.Names.ListKind = obj.Names.Kind + "List"
}
},
func(obj *apiextensions.JSONSchemaProps, c fuzz.Continue) {
// we cannot use c.FuzzNoCustom because of the interface{} fields. So let's loop with reflection.
vobj := reflect.ValueOf(obj).Elem()
tobj := reflect.TypeOf(obj).Elem()
for i := 0; i < tobj.NumField(); i++ {
field := tobj.Field(i)
switch field.Name {
case "Default", "Enum", "Example", "Ref":
continue
default:
isValue := true
switch field.Type.Kind() {
case reflect.Interface, reflect.Map, reflect.Slice, reflect.Ptr:
isValue = false
}
if isValue || c.Intn(10) == 0 {
c.Fuzz(vobj.Field(i).Addr().Interface())
// JSON keys must not contain escape char with our JSON codec (jsoniter)
// TODO: remove this when/if we moved from jsoniter.ConfigFastest to ConfigCompatibleWithStandardLibrary
if field.Type.Kind() == reflect.Map {
keys := append([]reflect.Value(nil), vobj.Field(i).MapKeys()...)
for _, k := range keys {
stripped := toJSONString(k.String())
if stripped == k.String() {
continue
}
// set new key
vobj.Field(i).SetMapIndex(reflect.ValueOf(stripped), vobj.Field(i).MapIndex(k))
// remove old
vobj.Field(i).SetMapIndex(k, reflect.Value{})
}
}
}
}
}
if c.RandBool() {
validJSON := apiextensions.JSON(`{"some": {"json": "test"}, "string": 42}`)
obj.Default = &validJSON
}
if c.RandBool() {
obj.Enum = []apiextensions.JSON{c.Float64(), c.RandString(), c.RandBool()}
}
if c.RandBool() {
validJSON := apiextensions.JSON(`"foobarbaz"`)
obj.Example = &validJSON
}
if c.RandBool() {
validRef := "validRef"
obj.Ref = &validRef
}
},
func(obj *apiextensions.JSONSchemaPropsOrBool, c fuzz.Continue) {
if c.RandBool() {
obj.Schema = &apiextensions.JSONSchemaProps{}
c.Fuzz(obj.Schema)
} else {
obj.Allows = c.RandBool()
}
},
func(obj *apiextensions.JSONSchemaPropsOrArray, c fuzz.Continue) {
// disallow both Schema and JSONSchemas to be nil.
if c.RandBool() {
obj.Schema = &apiextensions.JSONSchemaProps{}
c.Fuzz(obj.Schema)
} else {
obj.JSONSchemas = make([]apiextensions.JSONSchemaProps, c.Intn(3)+1)
for i := range obj.JSONSchemas {
c.Fuzz(&obj.JSONSchemas[i])
}
}
},
func(obj *apiextensions.JSONSchemaPropsOrStringArray, c fuzz.Continue) {
if c.RandBool() {
obj.Schema = &apiextensions.JSONSchemaProps{}
c.Fuzz(obj.Schema)
} else {
c.Fuzz(&obj.Property)
}
},
}
}
func toJSONString(s string) string {
return strings.Map(func(r rune) rune {
// replace chars which are not supported in keys by jsoniter.ConfigFastest
if r == '\\' || r == '"' {
return 'x'
}
return r
}, s)
}