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secret.go
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secret.go
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// Copyright 2022 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 secret
import (
"context"
"fmt"
"sync"
secretmanager "cloud.google.com/go/secretmanager/apiv1"
secretmanagerpb "google.golang.org/genproto/googleapis/cloud/secretmanager/v1"
)
const gsmSecretStr = "projects/%s/secrets/%s/versions/%s"
// GSMSecretAccessor returns an accessor to retrieve decrypted credential for the provided GSM secret specification.
type GSMSecretAccessor struct {
projectId string
secretId string
version string
passwd *string
mu sync.Mutex
}
// Get returns the decrypted value of this secret and cache it for later invocation.
func (g *GSMSecretAccessor) Get(ctx context.Context) (string, error) {
if g.passwd != nil {
return *g.passwd, nil
}
// secret value will not change.
g.mu.Lock()
defer g.mu.Unlock()
client, err := secretmanager.NewClient(ctx)
if err != nil {
return "", err
}
defer client.Close()
req := &secretmanagerpb.AccessSecretVersionRequest{
Name: fmt.Sprintf(gsmSecretStr, g.projectId, g.secretId, g.version),
}
// Call the API.
result, err := client.AccessSecretVersion(ctx, req)
if err != nil {
return "", fmt.Errorf("failed to access secret version: %v", err)
}
return string(result.Payload.Data[:]), nil
}
// Clear cleans up the cached value.
func (g *GSMSecretAccessor) Clear() {
// best effort to clear password from memory, expect GC to clear the string.
g.mu.Lock()
defer g.mu.Unlock()
g.passwd = nil
}
// NewGSMSecretAccessor returns a Google Secret Manager secret accessor.
func NewGSMSecretAccessor(projectId, secretId, version string) *GSMSecretAccessor {
return &GSMSecretAccessor{
projectId: projectId,
secretId: secretId,
version: version,
}
}