/*
 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

     https://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 document

import (
	b64 "encoding/base64"
)

// GetSecretDataKey understands how to retrieve a specific top level key from a secret
// that may have the data stored under a data or stringData field in which
// case the key may be base64 encoded or it may be plain text
//
// it is meant to be used by other high level dochelpers
func GetSecretDataKey(cfg Document, key string) (string, error) {
	var needsBase64Decode = true
	var docName = cfg.GetName()

	// this purposely doesn't handle binaryData as that isn't
	// something we could support anyways
	data, err := cfg.GetStringMap("stringData")
	if err == nil {
		needsBase64Decode = false
	} else {
		data, err = cfg.GetStringMap("data")
		if err != nil {
			return "", ErrDocumentMalformed{
				DocName: docName,
				Message: "The secret document lacks a data or stringData top level field",
			}
		}
	}

	res, ok := data[key]
	if !ok {
		return "", ErrDocumentDataKeyNotFound{DocName: docName, Key: key}
	}

	if needsBase64Decode {
		byteSlice, err := b64.StdEncoding.DecodeString(res)
		if err != nil {
			return "", err
		}
		return string(byteSlice), nil
	}
	return res, nil
}