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//
// Copyright 2024 The Sigstore 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 handler implements helper functions for plugins written in go. It will extract
// values from PluginArgs and pass them the real SignerVerifier implementation, and then package
// responses into PluginResp.
package handler
import (
"bytes"
"context"
"io"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature/kms/cliplugin/common"
"github.com/sigstore/sigstore/pkg/signature/kms/cliplugin/encoding"
"github.com/sigstore/sigstore/pkg/signature/kms/cliplugin/internal/signerverifier"
)
// DefaultAlgorithm parses arguments and return values to and from the impl.
func DefaultAlgorithm(_ io.Reader, _ *common.DefaultAlgorithmArgs, impl signerverifier.SignerVerifier) (*common.DefaultAlgorithmResp, error) {
defaultAlgorithm := impl.DefaultAlgorithm()
resp := &common.DefaultAlgorithmResp{
DefaultAlgorithm: defaultAlgorithm,
}
return resp, nil
}
// SupportedAlgorithms parses arguments and return values to and from the impl.
func SupportedAlgorithms(_ io.Reader, _ *common.SupportedAlgorithmsArgs, impl signerverifier.SignerVerifier) (*common.SupportedAlgorithmsResp, error) {
supportedAlgorithms := impl.SupportedAlgorithms()
resp := &common.SupportedAlgorithmsResp{
SupportedAlgorithms: supportedAlgorithms,
}
return resp, nil
}
// CreateKey parses arguments and return values to and from the impl.
func CreateKey(_ io.Reader, args *common.CreateKeyArgs, impl signerverifier.SignerVerifier) (*common.CreateKeyResp, error) {
ctx := context.Background()
if args.CtxDeadline != nil {
var cancel context.CancelFunc
ctx, cancel = context.WithDeadline(ctx, *args.CtxDeadline)
defer cancel()
}
publicKey, err := impl.CreateKey(ctx, args.Algorithm)
if err != nil {
return nil, err
}
publicKeyPEM, err := cryptoutils.MarshalPublicKeyToPEM(publicKey)
if err != nil {
return nil, err
}
resp := &common.CreateKeyResp{
PublicKeyPEM: publicKeyPEM,
}
return resp, nil
}
// PublicKey parses arguments and return values to and from the impl.
func PublicKey(_ io.Reader, args *common.PublicKeyArgs, impl signerverifier.SignerVerifier) (*common.PublicKeyResp, error) {
opts := encoding.UnpackPublicKeyOptions(args.PublicKeyOptions)
publicKey, err := impl.PublicKey(opts...)
if err != nil {
return nil, err
}
publicKeyPEM, err := cryptoutils.MarshalPublicKeyToPEM(publicKey)
if err != nil {
return nil, err
}
resp := &common.PublicKeyResp{
PublicKeyPEM: publicKeyPEM,
}
return resp, nil
}
// SignMessage parses arguments and return values to and from the impl.
func SignMessage(message io.Reader, args *common.SignMessageArgs, impl signerverifier.SignerVerifier) (*common.SignMessageResp, error) {
opts := encoding.UnpackSignOptions(args.SignOptions)
signature, err := impl.SignMessage(message, opts...)
if err != nil {
return nil, err
}
resp := &common.SignMessageResp{
Signature: signature,
}
return resp, nil
}
// VerifySignature parses arguments and return values to and from the impl.
func VerifySignature(message io.Reader, args *common.VerifySignatureArgs, impl signerverifier.SignerVerifier) (*common.VerifySignatureResp, error) {
opts := encoding.UnpackVerifyOptions(args.VerifyOptions)
err := impl.VerifySignature(bytes.NewReader(args.Signature), message, opts...)
if err != nil {
return nil, err
}
resp := &common.VerifySignatureResp{}
return resp, nil
}
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