feat: add native settings window

.gitignore

@@ -2,5 +2,6 @@
 .build/
 build/
 DerivedData/
+.vscode/
 *.xcuserdata/
 *.xcuserstate

README.md

@@ -10,6 +10,8 @@ This project is early, but it already has a working native prototype and an `ari
 - Segmented downloads with 16-32 requested parts per file.
 - Multiple files downloading at the same time.
 - Queue-based downloads with drag-and-drop priority ordering.
+- Native macOS Settings window, available from App menu > Settings and the main toolbar.
+- Configurable per-server connection count.
 - Automatic save folders under `~/Downloads`:
   - `Musics`
   - `Movies`
@@ -17,9 +19,11 @@ This project is early, but it already has a working native prototype and an `ari
   - `Pictures`
   - `Documents`
   - `Other`
+- Custom download locations per file category.
 - Broad file extension detection for audio, video, archive, image, and document formats.
 - HTTP, HTTPS, FTP, and SFTP URL support through `aria2c`.
-- Optional per-download username/password support for servers that require authentication.
+- Site login rules with URL pattern matching and Keychain-stored passwords.
+- Optional prevention of system sleep while files are downloading, while still allowing display sleep.
 - Pause, resume, cancel, delete, progress, speed, ETA, and connection count display.
 - Release `.app` bundle script for local macOS builds.
 
@@ -60,7 +64,7 @@ Because the current machine only has Command Line Tools selected, this repositor
 ## Roadmap
 
 - Persist download history and queue state.
-- Add Keychain-backed credential storage.
+- Improve site-login editing and migration tools.
 - Add browser integration and URL capture.
 - Add scheduler rules and speed limits.
 - Add checksum verification.

Sources/Firelink/AppSettings.swift

@@ -0,0 +1,171 @@
+import Foundation
+
+struct SiteLogin: Identifiable, Codable, Equatable, Sendable {
+    var id = UUID()
+    var urlPattern: String
+    var username: String
+}
+
+@MainActor
+final class AppSettings: ObservableObject {
+    @Published var perServerConnections: Int {
+        didSet {
+            let clamped = min(max(perServerConnections, 1), 16)
+            if perServerConnections != clamped {
+                perServerConnections = clamped
+            }
+            save()
+        }
+    }
+
+    @Published var preventsSleepWhileDownloading: Bool {
+        didSet { save() }
+    }
+
+    @Published var downloadDirectories: [DownloadCategory: String] {
+        didSet { save() }
+    }
+
+    @Published var siteLogins: [SiteLogin] {
+        didSet { save() }
+    }
+
+    @Published var message = ""
+
+    private let defaults: UserDefaults
+    private let storageKey = "Firelink.AppSettings.v1"
+
+    init(defaults: UserDefaults = .standard) {
+        self.defaults = defaults
+
+        if let data = defaults.data(forKey: storageKey),
+           let stored = try? JSONDecoder().decode(StoredSettings.self, from: data) {
+            perServerConnections = min(max(stored.perServerConnections, 1), 16)
+            preventsSleepWhileDownloading = stored.preventsSleepWhileDownloading
+            siteLogins = stored.siteLogins
+            downloadDirectories = Self.decodeDirectories(stored.downloadDirectories)
+        } else {
+            perServerConnections = 16
+            preventsSleepWhileDownloading = true
+            siteLogins = []
+            downloadDirectories = Self.defaultDirectories()
+        }
+
+        for category in DownloadCategory.allCases where downloadDirectories[category] == nil {
+            downloadDirectories[category] = Self.defaultDirectory(for: category).path
+        }
+    }
+
+    func destinationDirectory(for category: DownloadCategory) -> URL {
+        let path = downloadDirectories[category] ?? Self.defaultDirectory(for: category).path
+        return URL(fileURLWithPath: NSString(string: path).expandingTildeInPath, isDirectory: true)
+    }
+
+    func setDirectory(_ path: String, for category: DownloadCategory) {
+        let trimmed = path.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !trimmed.isEmpty else { return }
+        downloadDirectories[category] = NSString(string: trimmed).expandingTildeInPath
+    }
+
+    func resetDirectories() {
+        downloadDirectories = Self.defaultDirectories()
+    }
+
+    func addSiteLogin(urlPattern: String, username: String, password: String) {
+        let pattern = urlPattern.trimmingCharacters(in: .whitespacesAndNewlines)
+        let cleanUsername = username.trimmingCharacters(in: .whitespacesAndNewlines)
+
+        guard !pattern.isEmpty, !cleanUsername.isEmpty else {
+            message = "Add a URL pattern and username."
+            return
+        }
+
+        let login = SiteLogin(urlPattern: pattern, username: cleanUsername)
+        guard KeychainCredentialStore.setPassword(password, for: login.id) else {
+            message = "Could not save the password to Keychain."
+            return
+        }
+
+        siteLogins.append(login)
+        message = "Added login for \(pattern)."
+    }
+
+    func deleteSiteLogins(at offsets: IndexSet) {
+        for offset in offsets {
+            KeychainCredentialStore.deletePassword(for: siteLogins[offset].id)
+        }
+        siteLogins.remove(atOffsets: offsets)
+    }
+
+    func credentials(for url: URL) -> DownloadCredentials? {
+        guard let login = siteLogins.first(where: { Self.matches(url: url, pattern: $0.urlPattern) }),
+              let password = KeychainCredentialStore.password(for: login.id) else {
+            return nil
+        }
+
+        return DownloadCredentials(username: login.username, password: password)
+    }
+
+    private func save() {
+        let stored = StoredSettings(
+            perServerConnections: perServerConnections,
+            preventsSleepWhileDownloading: preventsSleepWhileDownloading,
+            downloadDirectories: Dictionary(uniqueKeysWithValues: downloadDirectories.map { ($0.key.rawValue, $0.value) }),
+            siteLogins: siteLogins
+        )
+
+        if let data = try? JSONEncoder().encode(stored) {
+            defaults.set(data, forKey: storageKey)
+        }
+    }
+
+    private static func matches(url: URL, pattern rawPattern: String) -> Bool {
+        let pattern = rawPattern.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
+        guard !pattern.isEmpty else { return false }
+
+        let host = (url.host(percentEncoded: false) ?? "").lowercased()
+        let absolute = url.absoluteString.lowercased()
+        let normalizedPattern = URL(string: pattern)?.host ?? pattern
+
+        if normalizedPattern.hasPrefix("*.") {
+            let suffix = String(normalizedPattern.dropFirst(2))
+            return host == suffix || host.hasSuffix(".\(suffix)")
+        }
+
+        if normalizedPattern.contains("*") {
+            let escaped = NSRegularExpression.escapedPattern(for: normalizedPattern)
+                .replacingOccurrences(of: "\\*", with: ".*")
+            return host.range(of: "^\(escaped)$", options: .regularExpression) != nil
+        }
+
+        if normalizedPattern.contains("/") {
+            return absolute.contains(normalizedPattern)
+        }
+
+        return host == normalizedPattern || host.hasSuffix(".\(normalizedPattern)")
+    }
+
+    private static func defaultDirectories() -> [DownloadCategory: String] {
+        Dictionary(uniqueKeysWithValues: DownloadCategory.allCases.map { ($0, defaultDirectory(for: $0).path) })
+    }
+
+    private static func defaultDirectory(for category: DownloadCategory) -> URL {
+        let downloads = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first
+            ?? URL(fileURLWithPath: NSHomeDirectory()).appendingPathComponent("Downloads")
+        return downloads.appendingPathComponent(category.rawValue, isDirectory: true)
+    }
+
+    private static func decodeDirectories(_ stored: [String: String]) -> [DownloadCategory: String] {
+        Dictionary(uniqueKeysWithValues: stored.compactMap { key, value in
+            guard let category = DownloadCategory(rawValue: key) else { return nil }
+            return (category, value)
+        })
+    }
+}
+
+private struct StoredSettings: Codable {
+    var perServerConnections: Int
+    var preventsSleepWhileDownloading: Bool
+    var downloadDirectories: [String: String]
+    var siteLogins: [SiteLogin]
+}

Sources/Firelink/Aria2DownloadEngine.swift

@@ -55,6 +55,7 @@ final class Aria2DownloadEngine {
 
     func start(
         item: DownloadItem,
+        perServerConnections: Int,
         progress: @escaping @Sendable (DownloadProgress) -> Void,
         completion: @escaping @Sendable (Result<Void, Error>) -> Void
     ) throws -> Handle {
@@ -121,7 +122,7 @@ final class Aria2DownloadEngine {
 
         do {
             try process.run()
-            if let input = inputFileContent(for: item).data(using: .utf8) {
+            if let input = inputFileContent(for: item, perServerConnections: perServerConnections).data(using: .utf8) {
                 inputPipe.fileHandleForWriting.write(input)
             }
             inputPipe.fileHandleForWriting.closeFile()
@@ -150,8 +151,8 @@ final class Aria2DownloadEngine {
         ]
     }
 
-    private func inputFileContent(for item: DownloadItem) -> String {
-        let sameHostConnections = min(item.parts, 16)
+    private func inputFileContent(for item: DownloadItem, perServerConnections: Int) -> String {
+        let sameHostConnections = min(max(perServerConnections, 1), item.parts)
         var lines = [
             sanitizedOptionValue(item.url.absoluteString),
             "  dir=\(sanitizedOptionValue(item.destinationDirectory.path))",

Sources/Firelink/ContentView.swift

@@ -3,8 +3,6 @@ import SwiftUI
 struct ContentView: View {
     @EnvironmentObject private var controller: DownloadController
     @State private var urlText = ""
-    @State private var username = ""
-    @State private var password = ""
     @State private var parts = 16.0
     @State private var selection: DownloadItem.ID?
 
@@ -16,8 +14,6 @@ struct ContentView: View {
             VStack(spacing: 0) {
                 AddDownloadBar(
                     urlText: $urlText,
-                    username: $username,
-                    password: $password,
                     parts: $parts,
                     addAction: addDownload
                 )
@@ -34,6 +30,10 @@ struct ContentView: View {
                         Label("Start Queue", systemImage: "play.fill")
                     }
 
+                    SettingsLink {
+                        Label("Settings", systemImage: "gearshape")
+                    }
+
                     if let selectedItem {
                         if selectedItem.status == .downloading {
                             Button {
@@ -68,14 +68,10 @@ struct ContentView: View {
     private func addDownload() {
         controller.add(
             urlText: urlText,
-            parts: Int(parts),
-            username: username,
-            password: password
+            parts: Int(parts)
         )
         if controller.engineMessage.hasPrefix("Added") {
             urlText = ""
-            username = ""
-            password = ""
         }
     }
 }
@@ -117,8 +113,6 @@ private struct SidebarView: View {
 
 private struct AddDownloadBar: View {
     @Binding var urlText: String
-    @Binding var username: String
-    @Binding var password: String
     @Binding var parts: Double
     let addAction: () -> Void
 
@@ -146,16 +140,6 @@ private struct AddDownloadBar: View {
                         .frame(width: 62, alignment: .trailing)
                 }
 
-                Divider()
-                    .frame(height: 22)
-
-                TextField("Username", text: $username)
-                    .textFieldStyle(.roundedBorder)
-                    .frame(width: 180)
-                SecureField("Password", text: $password)
-                    .textFieldStyle(.roundedBorder)
-                    .frame(width: 180)
-
                 Spacer()
             }
             .font(.callout)

Sources/Firelink/DownloadController.swift

@@ -7,8 +7,24 @@ final class DownloadController: ObservableObject {
     @Published var maxConcurrentDownloads = 3
     @Published var engineMessage = ""
 
+    private let settings: AppSettings
     private let engine = Aria2DownloadEngine()
     private var activeHandles: [UUID: Aria2DownloadEngine.Handle] = [:]
+    private var sleepActivity: SleepActivityHandle?
+    private var settingsCancellable: AnyCancellable?
+
+    init(settings: AppSettings) {
+        self.settings = settings
+        settingsCancellable = settings.$preventsSleepWhileDownloading.sink { [weak self] _ in
+            Task { @MainActor in
+                self?.updateSleepActivity()
+            }
+        }
+    }
+
+    deinit {
+        sleepActivity?.end()
+    }
 
     var activeCount: Int {
         downloads.filter { $0.status == .downloading }.count
@@ -30,7 +46,7 @@ final class DownloadController: ObservableObject {
         Aria2DownloadEngine.findExecutable() != nil
     }
 
-    func add(urlText: String, parts: Int, username: String, password: String) {
+    func add(urlText: String, parts: Int) {
         guard let url = URL(string: urlText.trimmingCharacters(in: .whitespacesAndNewlines)),
               let scheme = url.scheme?.lowercased(),
               ["http", "https", "ftp", "sftp"].contains(scheme) else {
@@ -40,14 +56,13 @@ final class DownloadController: ObservableObject {
 
         let fileName = FileClassifier.fileName(from: url)
         let category = FileClassifier.category(forFileName: fileName)
-        let credentials = DownloadCredentials(username: username, password: password)
         let item = DownloadItem(
             url: url,
             fileName: fileName,
             category: category,
-            destinationDirectory: FileClassifier.destinationDirectory(for: category),
+            destinationDirectory: settings.destinationDirectory(for: category),
             parts: min(max(parts, 16), 32),
-            credentials: credentials.isEmpty ? nil : credentials
+            credentials: settings.credentials(for: url)
         )
 
         downloads.append(item)
@@ -66,6 +81,7 @@ final class DownloadController: ObservableObject {
             $0.status = .paused
             $0.message = "Paused. Resume will continue from the partial file."
         }
+        updateSleepActivity()
         pumpQueue()
     }
 
@@ -84,6 +100,7 @@ final class DownloadController: ObservableObject {
             $0.status = .canceled
             $0.message = "Canceled"
         }
+        updateSleepActivity()
         pumpQueue()
     }
 
@@ -94,6 +111,7 @@ final class DownloadController: ObservableObject {
             activeHandles[item.id] = nil
         }
         downloads.remove(atOffsets: offsets)
+        updateSleepActivity()
     }
 
     func move(from source: IndexSet, to destination: Int) {
@@ -123,6 +141,7 @@ final class DownloadController: ObservableObject {
         do {
             let handle = try engine.start(
                 item: item,
+                perServerConnections: settings.perServerConnections,
                 progress: { [weak self] progress in
                     Task { @MainActor in
                         self?.update(item.id) {
@@ -161,6 +180,7 @@ final class DownloadController: ObservableObject {
                         }
 
                         self.pumpQueue()
+                        self.updateSleepActivity()
                     }
                 }
             )
@@ -168,11 +188,13 @@ final class DownloadController: ObservableObject {
             update(item.id) {
                 $0.message = "Process \(handle.processIdentifier)"
             }
+            updateSleepActivity()
         } catch {
             update(item.id) {
                 $0.status = .failed
                 $0.message = error.localizedDescription
             }
+            updateSleepActivity()
             pumpQueue()
         }
     }
@@ -181,4 +203,30 @@ final class DownloadController: ObservableObject {
         guard let index = downloads.firstIndex(where: { $0.id == id }) else { return }
         mutate(&downloads[index])
     }
+
+    private func updateSleepActivity() {
+        let shouldPreventSleep = settings.preventsSleepWhileDownloading && activeCount > 0
+
+        if shouldPreventSleep, sleepActivity == nil {
+            sleepActivity = SleepActivityHandle(activity: ProcessInfo.processInfo.beginActivity(
+                options: [.idleSystemSleepDisabled],
+                reason: "Firelink is downloading files."
+            ))
+        } else if !shouldPreventSleep, let activity = sleepActivity {
+            activity.end()
+            sleepActivity = nil
+        }
+    }
+}
+
+private final class SleepActivityHandle: @unchecked Sendable {
+    private let activity: NSObjectProtocol
+
+    init(activity: NSObjectProtocol) {
+        self.activity = activity
+    }
+
+    func end() {
+        ProcessInfo.processInfo.endActivity(activity)
+    }
 }

Sources/Firelink/FirelinkApp.swift

@@ -2,12 +2,20 @@ import SwiftUI
 
 @main
 struct FirelinkApp: App {
-    @StateObject private var controller = DownloadController()
+    @StateObject private var settings: AppSettings
+    @StateObject private var controller: DownloadController
+
+    init() {
+        let settings = AppSettings()
+        _settings = StateObject(wrappedValue: settings)
+        _controller = StateObject(wrappedValue: DownloadController(settings: settings))
+    }
 
     var body: some Scene {
         WindowGroup {
             ContentView()
                 .environmentObject(controller)
+                .environmentObject(settings)
                 .frame(minWidth: 980, minHeight: 640)
         }
         .windowStyle(.titleBar)
@@ -19,5 +27,10 @@ struct FirelinkApp: App {
                 .keyboardShortcut("r", modifiers: [.command])
             }
         }
+
+        Settings {
+            SettingsView()
+                .environmentObject(settings)
+        }
     }
 }

Sources/Firelink/KeychainCredentialStore.swift

@@ -0,0 +1,50 @@
+import Foundation
+import Security
+
+enum KeychainCredentialStore {
+    private static let service = "local.firelink.site-login"
+
+    static func password(for id: UUID) -> String? {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: id.uuidString,
+            kSecReturnData as String: true,
+            kSecMatchLimit as String: kSecMatchLimitOne
+        ]
+
+        var result: CFTypeRef?
+        guard SecItemCopyMatching(query as CFDictionary, &result) == errSecSuccess,
+              let data = result as? Data else {
+            return nil
+        }
+
+        return String(data: data, encoding: .utf8)
+    }
+
+    @discardableResult
+    static func setPassword(_ password: String, for id: UUID) -> Bool {
+        deletePassword(for: id)
+
+        let attributes: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: id.uuidString,
+            kSecValueData as String: Data(password.utf8)
+        ]
+
+        return SecItemAdd(attributes as CFDictionary, nil) == errSecSuccess
+    }
+
+    @discardableResult
+    static func deletePassword(for id: UUID) -> Bool {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: id.uuidString
+        ]
+
+        let status = SecItemDelete(query as CFDictionary)
+        return status == errSecSuccess || status == errSecItemNotFound
+    }
+}

Sources/Firelink/SettingsView.swift

@@ -0,0 +1,195 @@
+import SwiftUI
+
+struct SettingsView: View {
+    @EnvironmentObject private var settings: AppSettings
+
+    var body: some View {
+        TabView {
+            DownloadSettingsPane()
+                .tabItem {
+                    Label("Downloads", systemImage: "arrow.down.circle")
+                }
+
+            LocationsSettingsPane()
+                .tabItem {
+                    Label("Locations", systemImage: "folder")
+                }
+
+            SiteLoginsSettingsPane()
+                .tabItem {
+                    Label("Site Logins", systemImage: "person.crop.circle.badge.key")
+                }
+
+            PowerSettingsPane()
+                .tabItem {
+                    Label("Power", systemImage: "moon.zzz")
+                }
+        }
+        .padding(20)
+        .frame(width: 680, height: 470)
+    }
+}
+
+private struct DownloadSettingsPane: View {
+    @EnvironmentObject private var settings: AppSettings
+
+    var body: some View {
+        Form {
+            Section {
+                Stepper(
+                    "Connections per server: \(settings.perServerConnections)",
+                    value: $settings.perServerConnections,
+                    in: 1...16
+                )
+                Text("Used by aria2 for each server. Firelink still lets each download request 16-32 parts.")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+        }
+        .formStyle(.grouped)
+    }
+}
+
+private struct LocationsSettingsPane: View {
+    @EnvironmentObject private var settings: AppSettings
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 14) {
+            ForEach(DownloadCategory.allCases, id: \.self) { category in
+                DirectoryPickerRow(category: category)
+            }
+
+            HStack {
+                Spacer()
+                Button("Reset Defaults") {
+                    settings.resetDirectories()
+                }
+            }
+        }
+    }
+}
+
+private struct DirectoryPickerRow: View {
+    @EnvironmentObject private var settings: AppSettings
+    let category: DownloadCategory
+
+    @State private var path = ""
+
+    var body: some View {
+        HStack(spacing: 10) {
+            Label(category.rawValue, systemImage: category.symbolName)
+                .frame(width: 125, alignment: .leading)
+
+            TextField("Folder path", text: Binding(
+                get: { settings.downloadDirectories[category] ?? path },
+                set: { newValue in
+                    path = newValue
+                    settings.setDirectory(newValue, for: category)
+                }
+            ))
+            .textFieldStyle(.roundedBorder)
+            .font(.system(.body, design: .monospaced))
+
+            Button {
+                selectFolder()
+            } label: {
+                Label("Select", systemImage: "folder.badge.plus")
+            }
+        }
+    }
+
+    private func selectFolder() {
+        let panel = NSOpenPanel()
+        panel.canChooseFiles = false
+        panel.canChooseDirectories = true
+        panel.allowsMultipleSelection = false
+        panel.canCreateDirectories = true
+        panel.directoryURL = settings.destinationDirectory(for: category)
+
+        if panel.runModal() == .OK, let url = panel.url {
+            settings.setDirectory(url.path, for: category)
+        }
+    }
+}
+
+private struct SiteLoginsSettingsPane: View {
+    @EnvironmentObject private var settings: AppSettings
+    @State private var urlPattern = ""
+    @State private var username = ""
+    @State private var password = ""
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 16) {
+            Grid(alignment: .leading, horizontalSpacing: 10, verticalSpacing: 10) {
+                GridRow {
+                    Text("URL Pattern")
+                    TextField("*.github.com", text: $urlPattern)
+                        .textFieldStyle(.roundedBorder)
+                }
+
+                GridRow {
+                    Text("Username")
+                    TextField("Username", text: $username)
+                        .textFieldStyle(.roundedBorder)
+                }
+
+                GridRow {
+                    Text("Password")
+                    SecureField("Password", text: $password)
+                        .textFieldStyle(.roundedBorder)
+                }
+            }
+
+            HStack {
+                Text(settings.message)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+                Spacer()
+                Button {
+                    settings.addSiteLogin(urlPattern: urlPattern, username: username, password: password)
+                    if settings.message.hasPrefix("Added") {
+                        urlPattern = ""
+                        username = ""
+                        password = ""
+                    }
+                } label: {
+                    Label("Add Login", systemImage: "plus")
+                }
+                .buttonStyle(.borderedProminent)
+            }
+
+            List {
+                ForEach(settings.siteLogins) { login in
+                    HStack {
+                        Image(systemName: "key.horizontal")
+                            .foregroundStyle(.secondary)
+                        Text(login.urlPattern)
+                            .font(.system(.body, design: .monospaced))
+                        Spacer()
+                        Text(login.username)
+                            .foregroundStyle(.secondary)
+                    }
+                }
+                .onDelete(perform: settings.deleteSiteLogins)
+            }
+            .frame(minHeight: 180)
+        }
+    }
+}
+
+private struct PowerSettingsPane: View {
+    @EnvironmentObject private var settings: AppSettings
+
+    var body: some View {
+        Form {
+            Section {
+                Toggle("Prevent system sleep while downloads are active", isOn: $settings.preventsSleepWhileDownloading)
+                Text("The display may still turn off. Firelink only keeps macOS awake enough to finish active downloads.")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+        }
+        .formStyle(.grouped)
+    }
+}