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attestation.go
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attestation.go
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//
// Copyright 2023 The Chainloop 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 biz
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"github.com/chainloop-dev/chainloop/internal/servicelogger"
"github.com/go-kratos/kratos/v2/log"
cr_v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/secure-systems-lab/go-securesystemslib/dsse"
)
type AttestationUseCase struct {
logger *log.Helper
CASClient
}
func NewAttestationUseCase(client CASClient, logger log.Logger) *AttestationUseCase {
if logger == nil {
logger = log.NewStdLogger(io.Discard)
}
return &AttestationUseCase{
logger: servicelogger.ScopedHelper(logger, "biz/attestation"),
CASClient: client,
}
}
func (uc *AttestationUseCase) UploadToCAS(ctx context.Context, envelope *dsse.Envelope, backend *CASBackend, workflowRunID string) (*cr_v1.Hash, error) {
filename := fmt.Sprintf("attestation-%s.json", workflowRunID)
jsonContent, err := json.Marshal(envelope)
if err != nil {
return nil, fmt.Errorf("marshaling the envelope: %w", err)
}
h, _, err := cr_v1.SHA256(bytes.NewBuffer(jsonContent))
if err != nil {
return nil, fmt.Errorf("calculating the digest: %w", err)
}
if err := uc.CASClient.Upload(ctx, string(backend.Provider), backend.SecretName, bytes.NewBuffer(jsonContent), filename, h.String()); err != nil {
return nil, fmt.Errorf("uploading to CAS: %w", err)
}
return &h, nil
}