WIP SPM

Sources/Brief/Updater.swift

@@ -0,0 +1,178 @@
+import Foundation
+import Combine
+
+public protocol UpdaterProtocol: ObservableObject {
+
+    var update: Release? { get }
+
+}
+
+public class Updater: ObservableObject, UpdaterProtocol {
+
+    @Published public var update: Release?
+
+    private let osVersion: SemVer
+    private let currentVersion: SemVer
+
+    public init(checkOnLaunch: Bool, osVersion: SemVer = SemVer(ProcessInfo.processInfo.operatingSystemVersion), currentVersion: SemVer = SemVer(Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "0.0.0")) {
+        self.osVersion = osVersion
+        self.currentVersion = currentVersion
+        if checkOnLaunch {
+            // Don't do a launch check if the user hasn't seen the setup prompt explaining updater yet.
+            checkForUpdates()
+        }
+        let timer = Timer.scheduledTimer(withTimeInterval: 60*60*24, repeats: true) { _ in
+            self.checkForUpdates()
+        }
+        timer.tolerance = 60*60
+    }
+
+    public func checkForUpdates() {
+        URLSession.shared.dataTask(with: Constants.updateURL) { data, _, _ in
+            guard let data = data else { return }
+            guard let releases = try? JSONDecoder().decode([Release].self, from: data) else { return }
+            self.evaluate(releases: releases)
+        }.resume()
+    }
+
+    public func ignore(release: Release) {
+        guard !release.critical else { return }
+        defaults.set(true, forKey: release.name)
+        DispatchQueue.main.async {
+            self.update = nil
+        }
+    }
+
+}
+
+extension Updater {
+
+    func evaluate(releases: [Release]) {
+        guard let release = releases
+                .sorted()
+                .reversed()
+                .filter({ !$0.prerelease })
+                .first(where: { $0.minimumOSVersion <= osVersion }) else { return }
+        guard !userIgnored(release: release) else { return }
+        guard !release.prerelease else { return }
+        let latestVersion = SemVer(release.name)
+        if latestVersion > currentVersion {
+            DispatchQueue.main.async {
+                self.update = release
+            }
+        }
+    }
+
+    func userIgnored(release: Release) -> Bool {
+        guard !release.critical else { return false }
+        return defaults.bool(forKey: release.name)
+    }
+
+    var defaults: UserDefaults {
+        UserDefaults(suiteName: "com.maxgoedjen.Secretive.updater.ignorelist")!
+    }
+}
+
+public struct SemVer {
+
+    let versionNumbers: [Int]
+
+    public init(_ version: String) {
+        // Betas have the format 1.2.3_beta1
+        let strippedBeta = version.split(separator: "_").first!
+        var split = strippedBeta.split(separator: ".").compactMap { Int($0) }
+        while split.count < 3 {
+            split.append(0)
+        }
+        versionNumbers = split
+    }
+
+    public init(_ version: OperatingSystemVersion) {
+        versionNumbers = [version.majorVersion, version.minorVersion, version.patchVersion]
+    }
+
+}
+
+extension SemVer: Comparable {
+
+    public static func < (lhs: SemVer, rhs: SemVer) -> Bool {
+        for (latest, current) in zip(lhs.versionNumbers, rhs.versionNumbers) {
+            if latest < current {
+                return true
+            } else if latest > current {
+                return false
+            }
+        }
+        return false
+    }
+
+
+}
+
+extension Updater {
+
+    enum Constants {
+        static let updateURL = URL(string: "https://api.github.com/repos/maxgoedjen/secretive/releases")!
+    }
+
+}
+
+public struct Release: Codable {
+
+    public let name: String
+    public let prerelease: Bool
+    public let html_url: URL
+    public let body: String
+
+    public init(name: String, prerelease: Bool, html_url: URL, body: String) {
+        self.name = name
+        self.prerelease = prerelease
+        self.html_url = html_url
+        self.body = body
+    }
+
+}
+
+extension Release: Identifiable {
+
+    public var id: String {
+        html_url.absoluteString
+    }
+
+}
+
+extension Release: Comparable {
+
+    public static func < (lhs: Release, rhs: Release) -> Bool {
+        lhs.version < rhs.version
+    }
+
+}
+
+extension Release {
+
+    public var critical: Bool {
+        body.contains(Constants.securityContent)
+    }
+
+    public var version: SemVer {
+        SemVer(name)
+    }
+
+    public var minimumOSVersion: SemVer {
+        guard let range = body.range(of: "Minimum macOS Version"),
+              let numberStart = body.rangeOfCharacter(from: CharacterSet.decimalDigits, options: [], range: range.upperBound..<body.endIndex) else { return SemVer("11.0.0") }
+        let numbersEnd = body.rangeOfCharacter(from: CharacterSet.whitespacesAndNewlines, options: [], range: numberStart.upperBound..<body.endIndex)?.lowerBound ?? body.endIndex
+        let version = numberStart.lowerBound..<numbersEnd
+        return SemVer(String(body[version]))
+    }
+
+}
+
+extension Release {
+
+    enum Constants {
+        static let securityContent = "Critical Security Update"
+    }
+
+}