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// Copyright 2019 Google LLC
//
// 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 keyset
import (
"io"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
// JSONReader deserializes a keyset from json format.
type JSONReader struct {
r io.Reader
j *protojson.UnmarshalOptions
}
// NewJSONReader returns new JSONReader that will read from r.
func NewJSONReader(r io.Reader) *JSONReader {
return &JSONReader{
r: r,
j: &protojson.UnmarshalOptions{},
}
}
// Read parses a (cleartext) keyset from the underlying io.Reader.
func (bkr *JSONReader) Read() (*tinkpb.Keyset, error) {
keyset := &tinkpb.Keyset{}
if err := bkr.readJSON(bkr.r, keyset); err != nil {
return nil, err
}
return keyset, nil
}
// ReadEncrypted parses an EncryptedKeyset from the underlying io.Reader.
func (bkr *JSONReader) ReadEncrypted() (*tinkpb.EncryptedKeyset, error) {
keyset := &tinkpb.EncryptedKeyset{}
if err := bkr.readJSON(bkr.r, keyset); err != nil {
return nil, err
}
return keyset, nil
}
func (bkr *JSONReader) readJSON(r io.Reader, msg proto.Message) error {
b, err := io.ReadAll(r)
if err != nil {
return err
}
return bkr.j.Unmarshal(b, msg)
}
// JSONWriter serializes a keyset into json format.
type JSONWriter struct {
w io.Writer
j *protojson.MarshalOptions
}
// NewJSONWriter returns a new JSONWriter that will write to w.
func NewJSONWriter(w io.Writer) *JSONWriter {
return &JSONWriter{
w: w,
j: &protojson.MarshalOptions{
EmitUnpopulated: true,
Indent: "",
},
}
}
// Write writes the keyset to the underlying io.Writer.
func (bkw *JSONWriter) Write(keyset *tinkpb.Keyset) error {
return bkw.writeJSON(bkw.w, keyset)
}
// WriteEncrypted writes the encrypted keyset to the underlying io.Writer.
func (bkw *JSONWriter) WriteEncrypted(keyset *tinkpb.EncryptedKeyset) error {
return bkw.writeJSON(bkw.w, keyset)
}
func (bkw *JSONWriter) writeJSON(w io.Writer, msg proto.Message) error {
b, err := bkw.j.Marshal(msg)
if err != nil {
return err
}
_, err = w.Write(b)
return err
}
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