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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCertificates open source project
//
// Copyright (c) 2022-2023 Apple Inc. and the SwiftCertificates project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftCertificates project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import Foundation
import SwiftASN1
// Time ::= CHOICE {
// utcTime UTCTime,
// generalTime GeneralizedTime }
@usableFromInline
enum Time: DERParseable, DERSerializable, Hashable, Sendable {
case utcTime(UTCTime)
case generalTime(GeneralizedTime)
@inlinable
init(derEncoded rootNode: ASN1Node) throws {
switch rootNode.identifier {
case GeneralizedTime.defaultIdentifier:
self = .generalTime(try GeneralizedTime(derEncoded: rootNode))
case UTCTime.defaultIdentifier:
self = .utcTime(try UTCTime(derEncoded: rootNode))
default:
throw ASN1Error.unexpectedFieldType(rootNode.identifier)
}
}
@inlinable
func serialize(into coder: inout DER.Serializer) throws {
switch self {
case .utcTime(let utcTime):
try coder.serialize(utcTime)
case .generalTime(let generalizedTime):
try coder.serialize(generalizedTime)
}
}
@inlinable
static func makeTime(from date: Date) throws -> Time {
let components = date.utcDate
// The rule is if the year is outside the range 1950-2049 inclusive, we should encode
// it as a generalized time. Otherwise, use a UTCTime.
guard ((1950)..<(2050)).contains(components.year) else {
let generalizedTime = try GeneralizedTime(components)
return .generalTime(generalizedTime)
}
let utcTime = try UTCTime(components)
return .utcTime(utcTime)
}
}
extension Date {
@inlinable
init(fromUTCDate date: (year: Int, month: Int, day: Int, hours: Int, minutes: Int, seconds: Int)) {
let timestamp = Int64(timestampFromUTCDate: date)
self = .init(timeIntervalSince1970: TimeInterval(timestamp))
}
@inlinable
var utcDate: (year: Int, month: Int, day: Int, hours: Int, minutes: Int, seconds: Int) {
let timestamp = Int64(self.timeIntervalSince1970.rounded())
return timestamp.utcDateFromTimestamp
}
@inlinable
init(_ time: Time) {
switch time {
case .generalTime(let generalizedTime):
self = .init(generalizedTime)
case .utcTime(let utcTime):
self = .init(utcTime)
}
}
@inlinable
init(_ time: GeneralizedTime) {
self = Date(
fromUTCDate: (
year: time.year, month: time.month, day: time.day, hours: time.hours, minutes: time.minutes,
seconds: time.seconds
)
)
}
@inlinable
init(_ time: UTCTime) {
self = Date(
fromUTCDate: (
year: time.year, month: time.month, day: time.day, hours: time.hours, minutes: time.minutes,
seconds: time.seconds
)
)
}
}
extension GeneralizedTime {
@inlinable
init(_ time: Time) {
switch time {
case .generalTime(let t):
self = t
case .utcTime(let t):
// This can never throw, all valid UTCTimes are valid GeneralizedTimes
self = try! GeneralizedTime(
year: t.year,
month: t.month,
day: t.day,
hours: t.hours,
minutes: t.minutes,
seconds: t.seconds,
fractionalSeconds: 0
)
}
}
@inlinable
init(_ components: (year: Int, month: Int, day: Int, hours: Int, minutes: Int, seconds: Int)) throws {
try self.init(
year: components.year,
month: components.month,
day: components.day,
hours: components.hours,
minutes: components.minutes,
seconds: components.seconds,
fractionalSeconds: 0.0
)
}
@inlinable
init(_ date: Date) {
// This cannot throw: any valid Date can be represented.
try! self.init(date.utcDate)
}
}
extension UTCTime {
@inlinable
init(_ components: (year: Int, month: Int, day: Int, hours: Int, minutes: Int, seconds: Int)) throws {
try self.init(
year: components.year,
month: components.month,
day: components.day,
hours: components.hours,
minutes: components.minutes,
seconds: components.seconds
)
}
}
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