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secrets.go
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secrets.go
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// Copyright 2023 The Authors (see AUTHORS file)
//
// 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 secrets
import (
"context"
"fmt"
"hash/crc32"
secretmanager "cloud.google.com/go/secretmanager/apiv1"
"cloud.google.com/go/secretmanager/apiv1/secretmanagerpb"
)
// AccessSecret reads a secret from Secret Manager using the given client and
// validates that it was not corrupted during retrieval. The secretResourceName
// should be in the format: 'projects/*/secrets/*/versions/*'.
func AccessSecret(ctx context.Context, client *secretmanager.Client, secretResourceName string) (string, error) {
result, err := client.AccessSecretVersion(ctx, &secretmanagerpb.AccessSecretVersionRequest{
Name: secretResourceName,
})
if err != nil {
return "", fmt.Errorf("failed to access secret %s: %w", secretResourceName, err)
}
crc32c := crc32.MakeTable(crc32.Castagnoli)
checksum := int64(crc32.Checksum(result.GetPayload().GetData(), crc32c))
if checksum != result.GetPayload().GetDataCrc32C() {
return "", fmt.Errorf("failed to access secret %s: data corrupted", secretResourceName)
}
return string(result.GetPayload().GetData()), nil
}