Merge pull request #315 from mohssenfathi/logout

Logout API

Author: mohssenfathi

Sources/UberAuth/AuthProviding.swift

@@ -33,7 +33,11 @@ public protocol AuthProviding {
                  prefill: Prefill?,
                  completion: @escaping (Result<Client, UberAuthError>) -> ())
 
+    func logout() -> Bool
+    
     func handle(response url: URL) -> Bool
+    
+    var isLoggedIn: Bool { get }
 }
 
 extension AuthProviding where Self == AuthorizationCodeAuthProvider {

Sources/UberAuth/Authorize/AuthorizationCodeAuthProvider.swift

@@ -157,6 +157,10 @@ public final class AuthorizationCodeAuthProvider: AuthProviding {
         self.completion = authCompletion
     }
 
+    public func logout() -> Bool {
+        tokenManager.deleteToken(identifier: TokenManager.defaultAccessTokenIdentifier)
+    }
+    
     public func handle(response url: URL) -> Bool {
         guard responseParser.isValidResponse(url: url, matching: redirectURI) else {
             return false
@@ -168,6 +172,10 @@ public final class AuthorizationCodeAuthProvider: AuthProviding {
         return true
     }
 
+    public var isLoggedIn: Bool {
+        tokenManager.getToken(identifier: TokenManager.defaultAccessTokenIdentifier) != nil
+    }
+    
     // MARK: - Private
 
     private func executeLogin(authDestination: AuthDestination,

Sources/UberAuth/UberAuth.swift

@@ -32,7 +32,11 @@ protocol AuthManaging {
 
     func login(context: AuthContext, completion: @escaping AuthCompletion)
 
+    func logout()
+    
     func handle(_ url: URL) -> Bool
+    
+    var isLoggedIn: Bool { get }
 }
 
 /// Public interface for the uber-auth-ios library
@@ -53,6 +57,13 @@ public final class UberAuth: AuthManaging {
         )
     }
 
+    /// Clears any saved auth information from the keychain
+    /// If `currentAuthContext` exists, logs out using the stored auth context
+    /// Otherwise, attempts to delete the saved auth token directly using the internal TokenManager
+    public static func logout() {
+        auth.logout()
+    }
+    
     /// Attempts to extract auth information from the provided URL.
     /// This method should be called from the implemeting application's openURL function.
     ///
@@ -63,9 +74,22 @@ public final class UberAuth: AuthManaging {
         auth.handle(url)
     }
 
+    /// A computed property that indicates if auth information is saved in the keychain
+    /// First checks for saved token information using the current auth provider
+    /// If no auth provider exists, falls back to the default token identifier
+    public static var isLoggedIn: Bool {
+        auth.isLoggedIn
+    }
+    
     // MARK: Internal
     // MARK: AuthManaging
 
+    init(currentContext: AuthContext? = nil,
+         tokenManager: TokenManaging = TokenManager()) {
+        self.currentContext = currentContext
+        self.tokenManager = tokenManager
+    }
+    
     func login(context: AuthContext = .init(),
                completion: @escaping AuthCompletion) {
         context.authProvider.execute(
@@ -76,15 +100,30 @@ public final class UberAuth: AuthManaging {
         currentContext = context
     }
 
+    func logout() {
+        guard let currentContext else {
+            tokenManager.deleteToken(identifier: TokenManager.defaultAccessTokenIdentifier)
+            return
+        }
+        currentContext.authProvider.logout()
+        self.currentContext = nil
+    }
+    
     func handle(_ url: URL) -> Bool {
         guard let currentContext else {
             return false
         }
         return currentContext.authProvider.handle(response: url)
     }
 
+    var isLoggedIn: Bool {
+        currentContext?.authProvider.isLoggedIn ?? (tokenManager.getToken(identifier: TokenManager.defaultAccessTokenIdentifier) != nil)
+    }
+    
     private static let auth = UberAuth()
 
-    private var currentContext: AuthContext?
+    var currentContext: AuthContext?
+    
+    var tokenManager: TokenManaging = TokenManager()
 }
 

examples/UberSDK/UberSDK/ContentView.swift

@@ -54,16 +54,19 @@ final class Content {
     var isPrefillExpanded: Bool = false
     var response: AuthReponse?
     var prefillBuilder = PrefillBuilder()
+    var isLoggedIn: Bool {
+        UberAuth.isLoggedIn
+    }
 
     func login() {
 
-        var promt: Prompt = []
-        if shouldForceLogin { promt.insert(.login) }
-        if shouldForceConsent { promt.insert(.consent) }
+        var prompt: Prompt = []
+        if shouldForceLogin { prompt.insert(.login) }
+        if shouldForceConsent { prompt.insert(.consent) }
 
         let authProvider: AuthProviding = .authorizationCode(
             shouldExchangeAuthCode: isTokenExchangeEnabled,
-            prompt: promt
+            prompt: prompt
         )
 
         let authDestination: AuthDestination = {
@@ -94,6 +97,11 @@ final class Content {
         )
     }
 
+    func logout() {
+        UberAuth.logout()
+        response = nil
+    }
+    
     func openUrl(_ url: URL) {
         UberAuth.handle(url)
     }
@@ -219,9 +227,11 @@ struct ContentView: View {
         }
 
         Button(
-            action: { content.login() },
+            action: {
+                content.isLoggedIn ? content.logout() : content.login()
+            },
             label: {
-                Text("Login")
+                Text(content.isLoggedIn ? "Logout" : "Login")
                     .frame(maxWidth: .infinity, alignment: .center)
             }
         )