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+import Foundation
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+import CryptoKit
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+import AppKit
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+import Network
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+
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+struct GoogleOAuthTokens: Codable, Equatable {
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+ var accessToken: String
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+ var refreshToken: String?
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+ var expiresAt: Date
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+ var scope: String?
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+ var tokenType: String?
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+}
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+
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+struct GoogleUserProfile: Codable, Equatable {
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+ var name: String?
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+ var email: String?
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+ var picture: String?
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+}
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+
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+enum GoogleOAuthError: Error {
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+ case missingClientId
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+ case missingClientSecret
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+ case invalidCallbackURL
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+ case missingAuthorizationCode
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+ case tokenExchangeFailed(String)
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+ case unableToOpenBrowser
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+ case authenticationTimedOut
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+ case noStoredTokens
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+}
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+
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+final class GoogleOAuthService: NSObject {
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+ static let shared = GoogleOAuthService()
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+
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+ // Stored in UserDefaults so you can configure without rebuilding.
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+ // Put your OAuth Desktop client ID here (from Google Cloud Console).
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+ private let clientIdDefaultsKey = "google.oauth.clientId"
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+ private let clientSecretDefaultsKey = "google.oauth.clientSecret"
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+ private let bundledClientId = "824412072260-m9g5g6mlemnb0o079rtuqnh0e1unmelc.apps.googleusercontent.com"
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+ private let bundledClientSecret = "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"
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+
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+ // Calendar is needed for schedule. Profile/email make login feel complete in-app.
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+ private let scopes = [
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+ "openid",
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+ "email",
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+ "profile",
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+ "https://www.googleapis.com/auth/calendar.events"
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+ ]
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+
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+ private let tokenStore = KeychainTokenStore()
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+ private override init() {}
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+
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+ func configuredClientId() -> String? {
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+ let value = UserDefaults.standard.string(forKey: clientIdDefaultsKey)?.trimmingCharacters(in: .whitespacesAndNewlines)
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+ if let value, value.isEmpty == false { return value }
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+ return bundledClientId
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+ }
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+
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+ func setClientIdForTesting(_ clientId: String) {
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+ UserDefaults.standard.set(clientId, forKey: clientIdDefaultsKey)
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+ }
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+
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+ func configuredClientSecret() -> String? {
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+ let value = UserDefaults.standard.string(forKey: clientSecretDefaultsKey)?.trimmingCharacters(in: .whitespacesAndNewlines)
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+ if let value, value.isEmpty == false { return value }
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+ return bundledClientSecret
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+ }
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+
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+ func setClientSecretForTesting(_ clientSecret: String) {
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+ UserDefaults.standard.set(clientSecret, forKey: clientSecretDefaultsKey)
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+ }
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+
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+ func signOut() throws {
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+ try tokenStore.deleteTokens()
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+ }
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+
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+ func loadTokens() -> GoogleOAuthTokens? {
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+ try? tokenStore.readTokens()
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+ }
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+
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+ func fetchUserProfile(accessToken: String) async throws -> GoogleUserProfile {
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+ var request = URLRequest(url: URL(string: "https://openidconnect.googleapis.com/v1/userinfo")!)
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+ request.httpMethod = "GET"
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+ request.setValue("Bearer \(accessToken)", forHTTPHeaderField: "Authorization")
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+
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+ let (data, response) = try await URLSession.shared.data(for: request)
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+ guard let http = response as? HTTPURLResponse, (200..<300).contains(http.statusCode) else {
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+ let details = String(data: data, encoding: .utf8) ?? "HTTP \((response as? HTTPURLResponse)?.statusCode ?? -1)"
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+ throw GoogleOAuthError.tokenExchangeFailed(details)
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+ }
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+ return try JSONDecoder().decode(GoogleUserProfile.self, from: data)
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+ }
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+
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+ func validAccessToken(presentingWindow: NSWindow?) async throws -> String {
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+ if var tokens = try tokenStore.readTokens() {
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+ if tokens.expiresAt.timeIntervalSinceNow > 60 {
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+ return tokens.accessToken
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+ }
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+ if let refreshed = try await refreshTokens(tokens) {
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+ tokens = refreshed
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+ try tokenStore.writeTokens(tokens)
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+ return tokens.accessToken
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+ }
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+ }
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+
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+ let tokens = try await interactiveSignIn(presentingWindow: presentingWindow)
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+ try tokenStore.writeTokens(tokens)
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+ return tokens.accessToken
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+ }
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+
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+ // MARK: - Interactive sign-in (Authorization Code + PKCE)
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+
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+ private func interactiveSignIn(presentingWindow: NSWindow?) async throws -> GoogleOAuthTokens {
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+ _ = presentingWindow
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+ guard let clientId = configuredClientId() else { throw GoogleOAuthError.missingClientId }
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+ guard let clientSecret = configuredClientSecret() else { throw GoogleOAuthError.missingClientSecret }
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+ let codeVerifier = Self.randomURLSafeString(length: 64)
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+ let codeChallenge = Self.pkceChallenge(for: codeVerifier)
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+ let state = Self.randomURLSafeString(length: 32)
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+
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+ let loopback = try await OAuthLoopbackServer.start()
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+ defer { loopback.stop() }
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+ let redirectURI = loopback.redirectURI
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+
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+ var components = URLComponents(string: "https://accounts.google.com/o/oauth2/v2/auth")!
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+ components.queryItems = [
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+ URLQueryItem(name: "client_id", value: clientId),
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+ URLQueryItem(name: "redirect_uri", value: redirectURI),
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+ URLQueryItem(name: "response_type", value: "code"),
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+ URLQueryItem(name: "scope", value: scopes.joined(separator: " ")),
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+ URLQueryItem(name: "state", value: state),
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+ URLQueryItem(name: "code_challenge", value: codeChallenge),
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+ URLQueryItem(name: "code_challenge_method", value: "S256"),
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+ URLQueryItem(name: "access_type", value: "offline"),
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+ URLQueryItem(name: "prompt", value: "consent")
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+ ]
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+
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+ guard let authURL = components.url else { throw GoogleOAuthError.invalidCallbackURL }
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+ guard NSWorkspace.shared.open(authURL) else { throw GoogleOAuthError.unableToOpenBrowser }
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+ let callbackURL = try await loopback.waitForCallback()
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+
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+ guard let returnedState = URLComponents(url: callbackURL, resolvingAgainstBaseURL: false)?
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+ .queryItems?.first(where: { $0.name == "state" })?.value,
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+ returnedState == state else {
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+ throw GoogleOAuthError.invalidCallbackURL
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+ }
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+
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+ guard let code = URLComponents(url: callbackURL, resolvingAgainstBaseURL: false)?
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+ .queryItems?.first(where: { $0.name == "code" })?.value,
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+ code.isEmpty == false else {
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+ throw GoogleOAuthError.missingAuthorizationCode
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+ }
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+
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+ return try await exchangeCodeForTokens(
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+ code: code,
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+ codeVerifier: codeVerifier,
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+ redirectURI: redirectURI,
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+ clientId: clientId,
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+ clientSecret: clientSecret
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+ )
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+ }
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+
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+ private func exchangeCodeForTokens(code: String, codeVerifier: String, redirectURI: String, clientId: String, clientSecret: String) async throws -> GoogleOAuthTokens {
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+ var request = URLRequest(url: URL(string: "https://oauth2.googleapis.com/token")!)
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+ request.httpMethod = "POST"
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+ request.setValue("application/x-www-form-urlencoded; charset=utf-8", forHTTPHeaderField: "Content-Type")
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+ request.httpBody = Self.formURLEncoded([
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+ "client_id": clientId,
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+ "client_secret": clientSecret,
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+ "code": code,
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+ "code_verifier": codeVerifier,
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+ "redirect_uri": redirectURI,
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+ "grant_type": "authorization_code"
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+ ])
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+
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+ let (data, response) = try await URLSession.shared.data(for: request)
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+ guard let http = response as? HTTPURLResponse, (200..<300).contains(http.statusCode) else {
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+ let details = String(data: data, encoding: .utf8) ?? "HTTP \((response as? HTTPURLResponse)?.statusCode ?? -1)"
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+ throw GoogleOAuthError.tokenExchangeFailed(details)
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+ }
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+
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+ struct TokenResponse: Decodable {
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+ let access_token: String
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+ let expires_in: Double
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+ let refresh_token: String?
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+ let scope: String?
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+ let token_type: String?
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+ }
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+
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+ let decoded = try JSONDecoder().decode(TokenResponse.self, from: data)
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+ return GoogleOAuthTokens(
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+ accessToken: decoded.access_token,
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+ refreshToken: decoded.refresh_token,
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+ expiresAt: Date().addingTimeInterval(decoded.expires_in),
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+ scope: decoded.scope,
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+ tokenType: decoded.token_type
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+ )
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+ }
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+
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+ private func refreshTokens(_ tokens: GoogleOAuthTokens) async throws -> GoogleOAuthTokens? {
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+ guard let refreshToken = tokens.refreshToken else { return nil }
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+ guard let clientId = configuredClientId() else { throw GoogleOAuthError.missingClientId }
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+ guard let clientSecret = configuredClientSecret() else { throw GoogleOAuthError.missingClientSecret }
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+
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+ var request = URLRequest(url: URL(string: "https://oauth2.googleapis.com/token")!)
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+ request.httpMethod = "POST"
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+ request.setValue("application/x-www-form-urlencoded; charset=utf-8", forHTTPHeaderField: "Content-Type")
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+ request.httpBody = Self.formURLEncoded([
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+ "client_id": clientId,
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+ "client_secret": clientSecret,
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+ "refresh_token": refreshToken,
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+ "grant_type": "refresh_token"
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+ ])
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+
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+ let (data, response) = try await URLSession.shared.data(for: request)
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+ guard let http = response as? HTTPURLResponse, (200..<300).contains(http.statusCode) else {
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+ return nil
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+ }
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+
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+ struct RefreshResponse: Decodable {
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+ let access_token: String
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+ let expires_in: Double
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+ let scope: String?
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+ let token_type: String?
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+ }
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+
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+ let decoded = try JSONDecoder().decode(RefreshResponse.self, from: data)
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+ return GoogleOAuthTokens(
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+ accessToken: decoded.access_token,
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+ refreshToken: refreshToken,
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+ expiresAt: Date().addingTimeInterval(decoded.expires_in),
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+ scope: decoded.scope ?? tokens.scope,
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+ tokenType: decoded.token_type ?? tokens.tokenType
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+ )
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+ }
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+
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+ // MARK: - Helpers
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+
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+ private static func pkceChallenge(for verifier: String) -> String {
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+ let data = Data(verifier.utf8)
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+ let digest = SHA256.hash(data: data)
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+ return Data(digest).base64URLEncodedString()
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+ }
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+
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+ private static func randomURLSafeString(length: Int) -> String {
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+ var bytes = [UInt8](repeating: 0, count: length)
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+ _ = SecRandomCopyBytes(kSecRandomDefault, bytes.count, &bytes)
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+ return Data(bytes).base64URLEncodedString()
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+ }
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+
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+ private static func formURLEncoded(_ params: [String: String]) -> Data {
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+ let allowed = CharacterSet(charactersIn: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~")
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+ let pairs = params.map { key, value -> String in
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+ let k = key.addingPercentEncoding(withAllowedCharacters: allowed) ?? key
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+ let v = value.addingPercentEncoding(withAllowedCharacters: allowed) ?? value
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+ return "\(k)=\(v)"
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+ }
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+ .joined(separator: "&")
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+ return Data(pairs.utf8)
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+ }
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+}
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+
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+private extension Data {
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+ func base64URLEncodedString() -> String {
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+ let s = base64EncodedString()
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+ return s
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+ .replacingOccurrences(of: "+", with: "-")
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+ .replacingOccurrences(of: "/", with: "_")
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+ .replacingOccurrences(of: "=", with: "")
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+ }
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+}
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+
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+private final class OAuthLoopbackServer {
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+ private let queue = DispatchQueue(label: "google.oauth.loopback.server")
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+ private let listener: NWListener
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+ private var readyContinuation: CheckedContinuation<Void, Error>?
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+ private var callbackContinuation: CheckedContinuation<URL, Error>?
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+ private var callbackURL: URL?
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+
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+ private init(listener: NWListener) {
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+ self.listener = listener
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+ }
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+
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+ static func start() async throws -> OAuthLoopbackServer {
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+ let listener = try NWListener(using: .tcp, on: .any)
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+ let server = OAuthLoopbackServer(listener: listener)
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+ try await server.startListening()
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+ return server
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+ }
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+
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+ var redirectURI: String {
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+ let port = listener.port?.rawValue ?? 0
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+ return "http://127.0.0.1:\(port)/oauth2redirect"
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+ }
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+
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295
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+ func waitForCallback(timeoutSeconds: Double = 120) async throws -> URL {
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296
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+ try await withThrowingTaskGroup(of: URL.self) { group in
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297
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+ group.addTask { [weak self] in
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298
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+ guard let self else { throw GoogleOAuthError.invalidCallbackURL }
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299
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+ return try await self.awaitCallback()
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300
|
+ }
|
|
|
301
|
+ group.addTask {
|
|
|
302
|
+ try await Task.sleep(nanoseconds: UInt64(timeoutSeconds * 1_000_000_000))
|
|
|
303
|
+ throw GoogleOAuthError.authenticationTimedOut
|
|
|
304
|
+ }
|
|
|
305
|
+
|
|
|
306
|
+ let url = try await group.next()!
|
|
|
307
|
+ group.cancelAll()
|
|
|
308
|
+ return url
|
|
|
309
|
+ }
|
|
|
310
|
+ }
|
|
|
311
|
+
|
|
|
312
|
+ func stop() {
|
|
|
313
|
+ queue.async {
|
|
|
314
|
+ self.listener.cancel()
|
|
|
315
|
+ if let callbackContinuation = self.callbackContinuation {
|
|
|
316
|
+ self.callbackContinuation = nil
|
|
|
317
|
+ callbackContinuation.resume(throwing: GoogleOAuthError.authenticationTimedOut)
|
|
|
318
|
+ }
|
|
|
319
|
+ }
|
|
|
320
|
+ }
|
|
|
321
|
+
|
|
|
322
|
+ private func startListening() async throws {
|
|
|
323
|
+ try await withCheckedThrowingContinuation { (continuation: CheckedContinuation<Void, Error>) in
|
|
|
324
|
+ queue.async {
|
|
|
325
|
+ self.readyContinuation = continuation
|
|
|
326
|
+ self.listener.stateUpdateHandler = { [weak self] state in
|
|
|
327
|
+ guard let self else { return }
|
|
|
328
|
+ switch state {
|
|
|
329
|
+ case .ready:
|
|
|
330
|
+ if let readyContinuation = self.readyContinuation {
|
|
|
331
|
+ self.readyContinuation = nil
|
|
|
332
|
+ readyContinuation.resume()
|
|
|
333
|
+ }
|
|
|
334
|
+ case .failed(let error):
|
|
|
335
|
+ if let readyContinuation = self.readyContinuation {
|
|
|
336
|
+ self.readyContinuation = nil
|
|
|
337
|
+ readyContinuation.resume(throwing: error)
|
|
|
338
|
+ }
|
|
|
339
|
+ case .cancelled:
|
|
|
340
|
+ if let readyContinuation = self.readyContinuation {
|
|
|
341
|
+ self.readyContinuation = nil
|
|
|
342
|
+ readyContinuation.resume(throwing: GoogleOAuthError.invalidCallbackURL)
|
|
|
343
|
+ }
|
|
|
344
|
+ default:
|
|
|
345
|
+ break
|
|
|
346
|
+ }
|
|
|
347
|
+ }
|
|
|
348
|
+ self.listener.newConnectionHandler = { [weak self] connection in
|
|
|
349
|
+ self?.handle(connection: connection)
|
|
|
350
|
+ }
|
|
|
351
|
+ self.listener.start(queue: self.queue)
|
|
|
352
|
+ }
|
|
|
353
|
+ }
|
|
|
354
|
+ }
|
|
|
355
|
+
|
|
|
356
|
+ private func awaitCallback() async throws -> URL {
|
|
|
357
|
+ if let callbackURL { return callbackURL }
|
|
|
358
|
+ return try await withCheckedThrowingContinuation { (continuation: CheckedContinuation<URL, Error>) in
|
|
|
359
|
+ queue.async {
|
|
|
360
|
+ if let callbackURL = self.callbackURL {
|
|
|
361
|
+ continuation.resume(returning: callbackURL)
|
|
|
362
|
+ return
|
|
|
363
|
+ }
|
|
|
364
|
+ self.callbackContinuation = continuation
|
|
|
365
|
+ }
|
|
|
366
|
+ }
|
|
|
367
|
+ }
|
|
|
368
|
+
|
|
|
369
|
+ private func handle(connection: NWConnection) {
|
|
|
370
|
+ connection.start(queue: queue)
|
|
|
371
|
+ connection.receive(minimumIncompleteLength: 1, maximumLength: 8192) { [weak self] data, _, _, _ in
|
|
|
372
|
+ guard let self else { return }
|
|
|
373
|
+ let requestLine = data
|
|
|
374
|
+ .flatMap { String(data: $0, encoding: .utf8) }?
|
|
|
375
|
+ .split(separator: "\r\n", omittingEmptySubsequences: false)
|
|
|
376
|
+ .first
|
|
|
377
|
+ .map(String.init)
|
|
|
378
|
+
|
|
|
379
|
+ var parsedURL: URL?
|
|
|
380
|
+ if let requestLine {
|
|
|
381
|
+ let parts = requestLine.split(separator: " ")
|
|
|
382
|
+ if parts.count >= 2 {
|
|
|
383
|
+ let pathAndQuery = String(parts[1])
|
|
|
384
|
+ parsedURL = URL(string: "http://127.0.0.1\(pathAndQuery)")
|
|
|
385
|
+ }
|
|
|
386
|
+ }
|
|
|
387
|
+
|
|
|
388
|
+ self.sendHTTPResponse(connection: connection, success: parsedURL != nil)
|
|
|
389
|
+
|
|
|
390
|
+ if let parsedURL {
|
|
|
391
|
+ self.callbackURL = parsedURL
|
|
|
392
|
+ DispatchQueue.main.async {
|
|
|
393
|
+ // Bring the app back to foreground once OAuth redirects.
|
|
|
394
|
+ NSApp.activate(ignoringOtherApps: true)
|
|
|
395
|
+ }
|
|
|
396
|
+ if let continuation = self.callbackContinuation {
|
|
|
397
|
+ self.callbackContinuation = nil
|
|
|
398
|
+ continuation.resume(returning: parsedURL)
|
|
|
399
|
+ }
|
|
|
400
|
+ self.listener.cancel()
|
|
|
401
|
+ }
|
|
|
402
|
+ connection.cancel()
|
|
|
403
|
+ }
|
|
|
404
|
+ }
|
|
|
405
|
+
|
|
|
406
|
+ private func sendHTTPResponse(connection: NWConnection, success: Bool) {
|
|
|
407
|
+ let body = success
|
|
|
408
|
+ ? "<html><body><h3>Authentication complete</h3><p>You can return to the app.</p></body></html>"
|
|
|
409
|
+ : "<html><body><h3>Authentication failed</h3></body></html>"
|
|
|
410
|
+ let response = """
|
|
|
411
|
+ HTTP/1.1 200 OK\r
|
|
|
412
|
+ Content-Type: text/html; charset=utf-8\r
|
|
|
413
|
+ Content-Length: \(body.utf8.count)\r
|
|
|
414
|
+ Connection: close\r
|
|
|
415
|
+ \r
|
|
|
416
|
+ \(body)
|
|
|
417
|
+ """
|
|
|
418
|
+ connection.send(content: Data(response.utf8), completion: .contentProcessed { _ in })
|
|
|
419
|
+ }
|
|
|
420
|
+}
|
|
|
421
|
+
|
|
|
422
|
+extension GoogleOAuthError: LocalizedError {
|
|
|
423
|
+ var errorDescription: String? {
|
|
|
424
|
+ switch self {
|
|
|
425
|
+ case .missingClientId:
|
|
|
426
|
+ return "Missing Google OAuth Client ID."
|
|
|
427
|
+ case .missingClientSecret:
|
|
|
428
|
+ return "Missing Google OAuth Client Secret."
|
|
|
429
|
+ case .invalidCallbackURL:
|
|
|
430
|
+ return "Invalid OAuth callback URL."
|
|
|
431
|
+ case .missingAuthorizationCode:
|
|
|
432
|
+ return "Google did not return an authorization code."
|
|
|
433
|
+ case .tokenExchangeFailed(let details):
|
|
|
434
|
+ return "Token exchange failed: \(details)"
|
|
|
435
|
+ case .unableToOpenBrowser:
|
|
|
436
|
+ return "Could not open browser for Google sign-in."
|
|
|
437
|
+ case .authenticationTimedOut:
|
|
|
438
|
+ return "Google sign-in timed out."
|
|
|
439
|
+ case .noStoredTokens:
|
|
|
440
|
+ return "No stored Google tokens found."
|
|
|
441
|
+ }
|
|
|
442
|
+ }
|
|
|
443
|
+}
|
|
|
444
|
+
|
huzaifahayat12
