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aws_secrets_manager.go
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/
aws_secrets_manager.go
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// Copyright 2020 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 secrets
import (
"context"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/secretsmanager"
)
// Compile-time check to verify implements interface.
var _ SecretManager = (*AWSSecretsManager)(nil)
// AWSSecretsManager implements SecretManager.
type AWSSecretsManager struct {
svc *secretsmanager.SecretsManager
}
// NewAWSSecretsManager creates a new secret manager for AWS. Configuration is
// provided via the standard AWS environment variables.
func NewAWSSecretsManager(ctx context.Context) (SecretManager, error) {
sess, err := session.NewSession()
if err != nil {
return nil, fmt.Errorf("failed to create session: %w", err)
}
svc := secretsmanager.New(sess)
return &AWSSecretsManager{
svc: svc,
}, nil
}
// GetSecretValue implements the SecretManager interface. Secret names should be
// of the format:
//
// SECRET@VERSION#STAGE
//
// Where:
// - SECRET is the name or ARN of the secret
// - VERSION is the version ID (default: "")
// - Stage is the stage (one of AWSCURRENT or AWSPREVIOUS, default: "")
//
// Secrets are expected to be string plaintext values (not JSON, YAML,
// key-value, etc).
func (sm *AWSSecretsManager) GetSecretValue(ctx context.Context, name string) (string, error) {
var secretID, versionID, versionStage string
current := &secretID
for _, ch := range name {
if ch == '@' {
current = &versionID
continue
}
if ch == '#' {
current = &versionStage
continue
}
*current += string(ch)
}
req := &secretsmanager.GetSecretValueInput{
SecretId: aws.String(secretID),
}
if versionID != "" {
req.VersionId = aws.String(versionID)
}
if versionStage != "" {
req.VersionStage = aws.String(versionStage)
}
result, err := sm.svc.GetSecretValueWithContext(ctx, req)
if err != nil {
return "", fmt.Errorf("failed to access secret %v: %w", name, err)
}
if v := aws.StringValue(result.SecretString); v != "" {
return v, nil
}
return string(result.SecretBinary), nil
}