1 files changed, 60 insertions, 0 deletions
diff --git a/octosentry/AuthStore.swift b/octosentry/AuthStore.swift
new file mode 100644
index 0000000..4386e38
--- /dev/null
+++ b/octosentry/AuthStore.swift
@@ -0,0 +1,60 @@
+//
+//  AuthStore.swift
+//  octosentry
+//
+//  Drives the device authorization flow and mirrors whether a token is
+//  currently in the Keychain. Replaces the GITHUB_TOKEN env var dev
+//  shortcut (spec §13) with the real v1 auth flow (spec §6).
+//
+
+import Foundation
+import Observation
+
+@Observable
+final class AuthStore {
+    private(set) var state: AuthState
+    private(set) var errorMessage: String?
+
+    private let client = GitHubDeviceAuthClient()
+    private var authorizationTask: Task<Void, Never>?
+
+    init() {
+        state = KeychainTokenStore.load() != nil ? .signedIn : .signedOut
+    }
+
+    var isSignedIn: Bool {
+        if case .signedIn = state { return true }
+        return false
+    }
+
+    func signIn() {
+        guard authorizationTask == nil else { return }
+        errorMessage = nil
+
+        authorizationTask = Task {
+            defer { authorizationTask = nil }
+            do {
+                let deviceCode = try await client.requestDeviceCode()
+                state = .awaitingAuthorization(userCode: deviceCode.userCode, verificationURL: deviceCode.verificationUri)
+
+                let token = try await client.pollForToken(
+                    deviceCode: deviceCode.deviceCode,
+                    interval: deviceCode.interval,
+                    expiresIn: deviceCode.expiresIn
+                )
+                try KeychainTokenStore.save(token)
+                state = .signedIn
+            } catch {
+                errorMessage = (error as? LocalizedError)?.errorDescription ?? error.localizedDescription
+                state = .signedOut
+            }
+        }
+    }
+
+    func signOut() {
+        authorizationTask?.cancel()
+        authorizationTask = nil
+        KeychainTokenStore.delete()
+        state = .signedOut
+    }
+}