bundesmessenger-ios/Config/BwiSettings.swift

/*
 * Copyright (c) 2021 BWI GmbH
 *
 * 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.
 */

import Foundation
import MatrixSDK
import KeychainAccess

@objcMembers
final class  BwiSettings : NSObject {
    static let shared = BwiSettings()

    private enum UserDefaultsKeys {
        static let additionalBwiHeaderKey = "bwiHeader"
    }
    
    private struct BwiSettingsConstants {
        static let bwiSettingsKeychainService: String = BuildSettings.baseBundleIdentifier + ".bwi-settings-service"
    }
    
    private let vault: KeyValueVault
    
    override init() {
        vault = KeychainVault(Keychain(service: BwiSettingsConstants.bwiSettingsKeychainService,
                                                     accessGroup: BuildSettings.keychainAccessGroup))
        super.init()
    }
    
    func reset() {
        additionalBwiHeader = UserAgentService().bwiUserAgentDict
        let sdkOptions = MXSDKOptions.sharedInstance()
        sdkOptions.httpAdditionalHeaders = UserAgentService().bwiUserAgentDict
    }
    
    // MARK: Servers
    
    var additionalBwiHeader: Dictionary<String, String> {
        get {
            do {
                guard let data = try vault.data(forKey: UserDefaultsKeys.additionalBwiHeaderKey) else {
                    return UserAgentService().bwiUserAgentDict
                }
                var dict = try JSONDecoder().decode(Dictionary<String,String>.self, from: data)
                dict["User-Agent"] = UserAgentService().bwiUserAgent
                return dict
            } catch {
                return UserAgentService().bwiUserAgentDict
            }
        } set {
            do {
                let data = try JSONEncoder().encode(newValue)
                try vault.set(data, forKey: UserDefaultsKeys.additionalBwiHeaderKey)
            } catch let error {
                NSLog("[PinCodePreferences] Error when storing addional header to the vault: \(error)")
            }
        }
    }
}