feat(controlplane): upload attestation to CAS (#308)

Signed-off-by: Miguel A. Cabrera Minagorri <devgorri@gmail.com>

app/controlplane/internal/biz/attestation.go

@@ -0,0 +1,65 @@
+//
+// 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, secretID, 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, secretID, bytes.NewBuffer(jsonContent), filename, h.String()); err != nil {
+		return nil, fmt.Errorf("uploading to CAS: %w", err)
+	}
+
+	return &h, nil
+}

app/controlplane/internal/biz/biz.go

@@ -31,6 +31,7 @@ var ProviderSet = wire.NewSet(
 	NewIntegrationUseCase,
 	NewMembershipUseCase,
 	NewCASClientUseCase,
+	NewAttestationUseCase,
 	NewWorkflowRunExpirerUseCase,
 	wire.Struct(new(NewIntegrationUseCaseOpts), "*"),
 	wire.Struct(new(NewUserUseCaseParams), "*"),

app/controlplane/internal/service/attestation.go

@@ -20,7 +20,9 @@ import (
 	"encoding/json"
 	"fmt"
 	"sort"
+	"time"
 
+	"github.com/cenkalti/backoff/v4"
 	cpAPI "github.com/chainloop-dev/chainloop/app/controlplane/api/controlplane/v1"
 	"github.com/chainloop-dev/chainloop/app/controlplane/internal/biz"
 	"github.com/chainloop-dev/chainloop/app/controlplane/internal/dispatcher"
@@ -46,6 +48,7 @@ type AttestationService struct {
 	integrationUseCase      *biz.IntegrationUseCase
 	integrationDispatcher   *dispatcher.FanOutDispatcher
 	casCredsUseCase         *biz.CASCredentialsUseCase
+	attestationUseCase      *biz.AttestationUseCase
 }
 
 type NewAttestationServiceOpts struct {
@@ -56,6 +59,7 @@ type NewAttestationServiceOpts struct {
 	CredsReader        credentials.Reader
 	IntegrationUseCase *biz.IntegrationUseCase
 	CasCredsUseCase    *biz.CASCredentialsUseCase
+	AttestationUC      *biz.AttestationUseCase
 	FanoutDispatcher   *dispatcher.FanOutDispatcher
 	Opts               []NewOpt
 }
@@ -71,6 +75,7 @@ func NewAttestationService(opts *NewAttestationServiceOpts) *AttestationService
 		integrationUseCase:      opts.IntegrationUseCase,
 		casCredsUseCase:         opts.CasCredsUseCase,
 		integrationDispatcher:   opts.FanoutDispatcher,
+		attestationUseCase:      opts.AttestationUC,
 	}
 }
 
@@ -188,7 +193,31 @@ func (s *AttestationService) Store(ctx context.Context, req *cpAPI.AttestationSe
 	}
 
 	// We currently only support one backend per workflowRun
-	secretName := wRun.CASBackends[0].SecretName
+	casBackend := wRun.CASBackends[0]
+
+	// If we have an external CAS backend, we will push there the attestation
+	if !casBackend.Inline {
+		b := backoff.NewExponentialBackOff()
+		b.MaxElapsedTime = 1 * time.Minute
+		err := backoff.Retry(
+			func() error {
+				// reset context
+				ctx := context.Background()
+				d, err := s.attestationUseCase.UploadToCAS(ctx, envelope, casBackend.SecretName, req.WorkflowRunId)
+				if err != nil {
+					return err
+				}
+
+				s.log.Infow("msg", "attestation uploaded to CAS", "digest", d, "runID", req.WorkflowRunId)
+				return nil
+			}, b)
+
+		if err != nil {
+			_ = sl.LogAndMaskErr(err, s.log)
+		}
+	}
+
+	secretName := casBackend.SecretName
 
 	// Run integrations dispatcher
 	go func() {