feat(modules): migrate to go modules and bump go version 1.14.4

- migrate to go module
- bump go version 1.14.4

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/k8s.io/apimachinery/pkg/runtime/serializer/json/json.go

@@ -35,34 +35,56 @@ import (
 
 // NewSerializer creates a JSON serializer that handles encoding versioned objects into the proper JSON form. If typer
 // is not nil, the object has the group, version, and kind fields set.
+// Deprecated: use NewSerializerWithOptions instead.
 func NewSerializer(meta MetaFactory, creater runtime.ObjectCreater, typer runtime.ObjectTyper, pretty bool) *Serializer {
-	return &Serializer{
-		meta:    meta,
-		creater: creater,
-		typer:   typer,
-		yaml:    false,
-		pretty:  pretty,
-	}
+	return NewSerializerWithOptions(meta, creater, typer, SerializerOptions{false, pretty, false})
 }
 
 // NewYAMLSerializer creates a YAML serializer that handles encoding versioned objects into the proper YAML form. If typer
 // is not nil, the object has the group, version, and kind fields set. This serializer supports only the subset of YAML that
 // matches JSON, and will error if constructs are used that do not serialize to JSON.
+// Deprecated: use NewSerializerWithOptions instead.
 func NewYAMLSerializer(meta MetaFactory, creater runtime.ObjectCreater, typer runtime.ObjectTyper) *Serializer {
+	return NewSerializerWithOptions(meta, creater, typer, SerializerOptions{true, false, false})
+}
+
+// NewSerializerWithOptions creates a JSON/YAML serializer that handles encoding versioned objects into the proper JSON/YAML
+// form. If typer is not nil, the object has the group, version, and kind fields set. Options are copied into the Serializer
+// and are immutable.
+func NewSerializerWithOptions(meta MetaFactory, creater runtime.ObjectCreater, typer runtime.ObjectTyper, options SerializerOptions) *Serializer {
 	return &Serializer{
 		meta:    meta,
 		creater: creater,
 		typer:   typer,
-		yaml:    true,
+		options: options,
 	}
 }
 
+// SerializerOptions holds the options which are used to configure a JSON/YAML serializer.
+// example:
+// (1) To configure a JSON serializer, set `Yaml` to `false`.
+// (2) To configure a YAML serializer, set `Yaml` to `true`.
+// (3) To configure a strict serializer that can return strictDecodingError, set `Strict` to `true`.
+type SerializerOptions struct {
+	// Yaml: configures the Serializer to work with JSON(false) or YAML(true).
+	// When `Yaml` is enabled, this serializer only supports the subset of YAML that
+	// matches JSON, and will error if constructs are used that do not serialize to JSON.
+	Yaml bool
+
+	// Pretty: configures a JSON enabled Serializer(`Yaml: false`) to produce human-readable output.
+	// This option is silently ignored when `Yaml` is `true`.
+	Pretty bool
+
+	// Strict: configures the Serializer to return strictDecodingError's when duplicate fields are present decoding JSON or YAML.
+	// Note that enabling this option is not as performant as the non-strict variant, and should not be used in fast paths.
+	Strict bool
+}
+
 type Serializer struct {
 	meta    MetaFactory
+	options SerializerOptions
 	creater runtime.ObjectCreater
 	typer   runtime.ObjectTyper
-	yaml    bool
-	pretty  bool
 }
 
 // Serializer implements Serializer
@@ -100,7 +122,27 @@ func (customNumberDecoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
 		}
 		iter.ReportError("DecodeNumber", err.Error())
 	default:
+		// init depth, if needed
+		if iter.Attachment == nil {
+			iter.Attachment = int(1)
+		}
+
+		// remember current depth
+		originalAttachment := iter.Attachment
+
+		// increment depth before descending
+		if i, ok := iter.Attachment.(int); ok {
+			iter.Attachment = i + 1
+			if i > 10000 {
+				iter.ReportError("parse", "exceeded max depth")
+				return
+			}
+		}
+
 		*(*interface{})(ptr) = iter.Read()
+
+		// restore current depth
+		iter.Attachment = originalAttachment
 	}
 }
 
@@ -119,11 +161,28 @@ func CaseSensitiveJsonIterator() jsoniter.API {
 	return config
 }
 
-// Private copy of jsoniter to try to shield against possible mutations
+// StrictCaseSensitiveJsonIterator returns a jsoniterator API that's configured to be
+// case-sensitive, but also disallows unknown fields when unmarshalling. It is compatible with
+// the encoding/json standard library.
+func StrictCaseSensitiveJsonIterator() jsoniter.API {
+	config := jsoniter.Config{
+		EscapeHTML:             true,
+		SortMapKeys:            true,
+		ValidateJsonRawMessage: true,
+		CaseSensitive:          true,
+		DisallowUnknownFields:  true,
+	}.Froze()
+	// Force jsoniter to decode number to interface{} via int64/float64, if possible.
+	config.RegisterExtension(&customNumberExtension{})
+	return config
+}
+
+// Private copies of jsoniter to try to shield against possible mutations
 // from outside. Still does not protect from package level jsoniter.Register*() functions - someone calling them
 // in some other library will mess with every usage of the jsoniter library in the whole program.
 // See https://github.com/json-iterator/go/issues/265
 var caseSensitiveJsonIterator = CaseSensitiveJsonIterator()
+var strictCaseSensitiveJsonIterator = StrictCaseSensitiveJsonIterator()
 
 // gvkWithDefaults returns group kind and version defaulting from provided default
 func gvkWithDefaults(actual, defaultGVK schema.GroupVersionKind) schema.GroupVersionKind {
@@ -160,7 +219,7 @@ func (s *Serializer) Decode(originalData []byte, gvk *schema.GroupVersionKind, i
 	}
 
 	data := originalData
-	if s.yaml {
+	if s.options.Yaml {
 		altered, err := yaml.YAMLToJSON(data)
 		if err != nil {
 			return nil, nil, err
@@ -216,12 +275,38 @@ func (s *Serializer) Decode(originalData []byte, gvk *schema.GroupVersionKind, i
 	if err := caseSensitiveJsonIterator.Unmarshal(data, obj); err != nil {
 		return nil, actual, err
 	}
+
+	// If the deserializer is non-strict, return successfully here.
+	if !s.options.Strict {
+		return obj, actual, nil
+	}
+
+	// In strict mode pass the data trough the YAMLToJSONStrict converter.
+	// This is done to catch duplicate fields regardless of encoding (JSON or YAML). For JSON data,
+	// the output would equal the input, unless there is a parsing error such as duplicate fields.
+	// As we know this was successful in the non-strict case, the only error that may be returned here
+	// is because of the newly-added strictness. hence we know we can return the typed strictDecoderError
+	// the actual error is that the object contains duplicate fields.
+	altered, err := yaml.YAMLToJSONStrict(originalData)
+	if err != nil {
+		return nil, actual, runtime.NewStrictDecodingError(err.Error(), string(originalData))
+	}
+	// As performance is not an issue for now for the strict deserializer (one has regardless to do
+	// the unmarshal twice), we take the sanitized, altered data that is guaranteed to have no duplicated
+	// fields, and unmarshal this into a copy of the already-populated obj. Any error that occurs here is
+	// due to that a matching field doesn't exist in the object. hence we can return a typed strictDecoderError,
+	// the actual error is that the object contains unknown field.
+	strictObj := obj.DeepCopyObject()
+	if err := strictCaseSensitiveJsonIterator.Unmarshal(altered, strictObj); err != nil {
+		return nil, actual, runtime.NewStrictDecodingError(err.Error(), string(originalData))
+	}
+	// Always return the same object as the non-strict serializer to avoid any deviations.
 	return obj, actual, nil
 }
 
 // Encode serializes the provided object to the given writer.
 func (s *Serializer) Encode(obj runtime.Object, w io.Writer) error {
-	if s.yaml {
+	if s.options.Yaml {
 		json, err := caseSensitiveJsonIterator.Marshal(obj)
 		if err != nil {
 			return err
@@ -234,7 +319,7 @@ func (s *Serializer) Encode(obj runtime.Object, w io.Writer) error {
 		return err
 	}
 
-	if s.pretty {
+	if s.options.Pretty {
 		data, err := caseSensitiveJsonIterator.MarshalIndent(obj, "", "  ")
 		if err != nil {
 			return err
@@ -248,7 +333,7 @@ func (s *Serializer) Encode(obj runtime.Object, w io.Writer) error {
 
 // RecognizesData implements the RecognizingDecoder interface.
 func (s *Serializer) RecognizesData(peek io.Reader) (ok, unknown bool, err error) {
-	if s.yaml {
+	if s.options.Yaml {
 		// we could potentially look for '---'
 		return false, true, nil
 	}