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//
// SettingsParser.swift
// MullvadVPN
//
// Created by Sajad Vishkai on 2022-11-22.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
private struct VersionHeader: Codable {
var version: Int
}
private struct Payload<T: Codable>: Codable {
var data: T
}
private struct VersionedPayload<T: Codable>: Codable {
var version: Int
var data: T
}
public struct SettingsParser {
/// The decoder used to decode values.
private let decoder: JSONDecoder
/// The encoder used to encode values.
private let encoder: JSONEncoder
public init(decoder: JSONDecoder, encoder: JSONEncoder) {
self.decoder = decoder
self.encoder = encoder
}
/// Produces versioned data encoded as the given type
public func producePayload(_ payload: some Codable, version: Int) throws -> Data {
try encoder.encode(VersionedPayload(version: version, data: payload))
}
/// Produces unversioned data encoded as the given type
public func produceUnversionedPayload(_ payload: some Codable) throws -> Data {
try encoder.encode(payload)
}
/// Returns settings version if found inside the stored data.
public func parseVersion(data: Data) throws -> Int {
let header = try decoder.decode(VersionHeader.self, from: data)
return header.version
}
/// Returns unversioned payload parsed as the given type.
public func parseUnversionedPayload<T: Codable>(
as type: T.Type,
from data: Data
) throws -> T {
try decoder.decode(T.self, from: data)
}
/// Returns data from versioned payload parsed as the given type.
public func parsePayload<T: Codable>(
as type: T.Type,
from data: Data
) throws -> T {
try decoder.decode(Payload<T>.self, from: data).data
}
}
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