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json_expander.go
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json_expander.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"
"encoding/json"
"fmt"
"strings"
)
type JSONExpander struct {
sm SecretManager
}
// NewJSONExpander creates a new secret manager that allows secret values to be stored as json.
// When resolving secrets, if "dot-notation" is provided via the secret-name, the secret value
// will be json-decoded and the dot-notation will be used to resolve the secret value.
func NewJSONExpander(ctx context.Context, f SecretManagerFunc) (SecretManager, error) {
sm, err := f(ctx)
if err != nil {
return nil, fmt.Errorf("failed to create new JSONExpander SecretManager: %w", err)
}
return WrapJSONExpander(ctx, sm)
}
// WrapJSONExpander wraps an existing SecretManager with json-expansion logic.
func WrapJSONExpander(ctx context.Context, sm SecretManager) (SecretManager, error) {
return &JSONExpander{
sm: sm,
}, nil
}
// GetSecretValue implements the SecretManager interface, but allows for json-expansion
// of the secret-value. If the secret name contains a period, the secret value is expected
// to be json. The secret name is assumed to come before the period, while the map-key is
// expected to follow.
//
// For example:
// If a secret with a name of "psqlcreds" has a value of `{"username":"gandalf", "password":"abc"}`
// When GetSecretValue(ctx, "psqlcreds") is called, the raw json value will be returned.
// When GetSecretValue(ctx, "psql.username") is called, only "gandalf" (without quotes) will be returned.
func (sm *JSONExpander) GetSecretValue(ctx context.Context, name string) (string, error) {
parts := strings.Split(name, ".")
if len(parts) == 1 {
return sm.sm.GetSecretValue(ctx, name)
}
secretName := parts[0]
jsonExpansionPath := parts[1:]
// Get the value from the embdedded secret-manager using what comes before the period.
smValue, err := sm.sm.GetSecretValue(ctx, secretName)
if err != nil {
return "", err
}
var m map[string]interface{}
if err := json.Unmarshal([]byte(smValue), &m); err != nil {
return "", err
}
var stringValue string
for _, p := range jsonExpansionPath {
v, ok := m[p]
if !ok {
return "", fmt.Errorf("missing key %v", p)
}
stringValue, ok = v.(string)
if !ok {
m, ok = v.(map[string]interface{})
if !ok {
return "", fmt.Errorf("not a string or a nested field: %v", p)
}
}
}
return stringValue, nil
}