LeadKit/TIKeychainUtils/Sources/KeychainCodableBackingStore/Keychain+CodableKeyValueStorage.swift

//
//  Copyright (c) 2020 Touch Instinct
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the Software), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation
import KeychainAccess
import TIFoundationUtils

public typealias KeychainCodableBackingStore<T: Codable> = CodableKeyValueBackingStore<Keychain, T>

extension Keychain: CodableKeyValueStorage {
    public func codableObject<Value: Decodable>(forKey key: StorageKey<Value>,
                                                decoder: CodableKeyValueDecoder) -> Result<Value, StorageError> {

        Result {
            try getData(key.rawValue)
        }
        .mapError {
            StorageError.unableToExtractData(underlyingError: $0)
        }
        .flatMap {
            guard let storedData = $0 else {
                return .failure(.valueNotFound)
            }

            return .success(storedData)
        }
        .flatMap {
            decoder.decodeDecodable(from: $0, for: key)
        }
    }

    public func set<Value: Encodable>(encodableObject: Value,
                                      forKey key: StorageKey<Value>,
                                      encoder: CodableKeyValueEncoder) -> Result<Void, StorageError> {

        encoder.encodeEncodable(value: encodableObject, for: key)
            .flatMap { encodedData in
                Result {
                    try set(encodedData, key: key.rawValue)
                }
                .mapError {
                    .unableToWriteData(underlyingError: $0)
                }
            }
    }

    public func removeCodableValue<Value: Codable>(forKey key: StorageKey<Value>) -> Result<Void, StorageError> {
        removeValue(forKey: key)
    }

    public func hasCodableValue<Value: Decodable>(forKey key: StorageKey<Value>) -> Result<Bool, StorageError> {
        Result {
            try contains(key.rawValue)
        }
        .mapError {
            .unableToExtractData(underlyingError: $0)
        }
    }

    public func removeValue<Value>(forKey key: StorageKey<Value>) -> Result<Void, StorageError> {
        Result {
            try remove(key.rawValue)
        }
        .mapError {
            .unableToWriteData(underlyingError: $0)
        }
    }
}