@@ -68,6 +68,11 @@ @interface FUIFacebookAuth () <FUIAuthProvider>
6868 */
6969@property (nonatomic , strong ) FIROAuthProvider *providerForEmulator;
7070
71+ /* * @property currentNonce
72+ @brief The nonce for the current Facebook Limited Login session, if any.
73+ */
74+ @property (nonatomic , copy , nullable ) NSString *currentNonce;
75+
7176@end
7277
7378@implementation FUIFacebookAuth {
@@ -131,6 +136,9 @@ - (nullable NSString *)providerID {
131136 return FIRFacebookAuthProviderID;
132137}
133138
139+ /* * @fn accessToken:
140+ @brief The access token provided by Facebook's login flow.
141+ */
134142- (nullable NSString *)accessToken {
135143 if (self.authUI .isEmulatorEnabled ) {
136144 return nil ;
@@ -139,10 +147,13 @@ - (nullable NSString *)accessToken {
139147}
140148
141149/* * @fn idToken:
142- @brief Facebook doesn't provide User Id Token during sign in flow
150+ @brief The ID token provided by Facebook's login flow.
143151 */
144152- (nullable NSString *)idToken {
145- return nil ;
153+ if (self.authUI .isEmulatorEnabled ) {
154+ return nil ;
155+ }
156+ return FBSDKAuthenticationToken.currentAuthenticationToken .tokenString ;
146157}
147158
148159- (NSString *)shortName {
@@ -191,29 +202,45 @@ - (void)signInWithDefaultValue:(nullable NSString *)defaultValue
191202 return ;
192203 }
193204
194- [_loginManager logInWithPermissions: _scopes
195- fromViewController: presentingViewController
196- handler: ^(FBSDKLoginManagerLoginResult *result,
197- NSError *error) {
198- if (error) {
199- NSError *newError =
200- [FUIAuthErrorUtils providerErrorWithUnderlyingError: error
201- providerID: FIRFacebookAuthProviderID];
202- [self completeSignInFlowWithAccessToken: nil error: newError];
203- } else if (result.isCancelled ) {
204- NSError *newError = [FUIAuthErrorUtils userCancelledSignInError ];
205- [self completeSignInFlowWithAccessToken: nil error: newError];
206- } else {
205+ if (self.useLimitedLogin ) {
206+ // Facebook Limited Login
207+ NSString *nonce = [FUIAuthUtils randomNonce ];
208+ self.currentNonce = nonce;
209+ FBSDKLoginConfiguration *configuration =
210+ [[FBSDKLoginConfiguration alloc ] initWithPermissions: _scopes
211+ tracking: FBSDKLoginTrackingLimited
212+ nonce: [FUIAuthUtils stringBySHA256HashingString: nonce]];
213+ [_loginManager logInFromViewController: presentingViewController
214+ configuration: configuration
215+ completion: ^(FBSDKLoginManagerLoginResult *result, NSError *error) {
216+ if ([self maybeHandleCancelledResult: result error: error]) {
217+ return ;
218+ }
219+ self->_email = FBSDKProfile.currentProfile .email ;
220+ NSString *idToken = FBSDKAuthenticationToken.currentAuthenticationToken .tokenString ;
221+ [self completeSignInFlowWithAccessToken: nil idToken: idToken error: nil ];
222+ }];
223+ } else {
224+ [_loginManager logInWithPermissions: _scopes
225+ fromViewController: presentingViewController
226+ handler: ^(FBSDKLoginManagerLoginResult *result,
227+ NSError *error) {
228+ if ([self maybeHandleCancelledResult: result error: error]) {
229+ return ;
230+ }
207231 // Retrieve email.
208- [[[FBSDKGraphRequest alloc ] initWithGraphPath: @" me" parameters: @{ @" fields" @" email" startWithCompletion: ^(id <FBSDKGraphRequestConnecting> connection,
209- id result,
210- NSError *error) {
232+ [[[FBSDKGraphRequest alloc ] initWithGraphPath: @" me"
233+ parameters: @{ @" fields" @" email"
234+ startWithCompletion: ^(id <FBSDKGraphRequestConnecting> connection,
235+ id result,
236+ NSError *error) {
211237 self->_email = result[@" email"
212238 }];
213239 [self completeSignInFlowWithAccessToken: result.token.tokenString
240+ idToken: nil
214241 error: nil ];
215- }
216- }];
242+ }];
243+ }
217244}
218245
219246- (void )signInWithOAuthProvider : (FIROAuthProvider *)oauthProvider
@@ -269,21 +296,31 @@ - (BOOL)handleOpenURL:(NSURL *)URL sourceApplication:(NSString *)sourceApplicati
269296
270297#pragma mark -
271298
272- /* * @fn completeSignInFlowWithAccessToken:error:
299+ /* * @fn completeSignInFlowWithAccessToken:idToken: error:
273300 @brief Called with the result of a Facebook sign-in attempt. Invokes and clears any pending
274301 sign in callback block.
275- @param accessToken The Facebook access token, if successful.
302+ @param accessToken The Facebook access token, if the Facebook sign-in attempt with tracking enabled is successful.
303+ @param idToken The Facebook ID token, if the Facebook Limited Login attempt is successful.
276304 @param error An error which occurred during the sign-in attempt.
277305 */
278306- (void )completeSignInFlowWithAccessToken : (nullable NSString *)accessToken
307+ idToken : (nullable NSString *)idToken
279308 error : (nullable NSError *)error {
280309 if (error) {
281310 [self callbackWithCredential: nil error: error result: nil ];
282311 return ;
283312 }
284- // Assume accessToken cannot be nil if there's no error.
285- NSString *_Nonnull token = (id _Nonnull)accessToken;
286- FIRAuthCredential *credential = [FIRFacebookAuthProvider credentialWithAccessToken: token];
313+ FIRAuthCredential *credential;
314+ if (idToken) {
315+ NSString *rawNonce = self.currentNonce ;
316+ credential = [FIROAuthProvider credentialWithProviderID: FIRFacebookAuthProviderID
317+ IDToken: idToken
318+ rawNonce: rawNonce];
319+ } else {
320+ // Assume accessToken cannot be nil if there's no error and idToken is nil.
321+ NSString *_Nonnull token = (id _Nonnull)accessToken;
322+ credential = [FIRFacebookAuthProvider credentialWithAccessToken: token];
323+ }
287324 UIActivityIndicatorView *activityView =
288325 [FUIAuthBaseViewController addActivityIndicator: _presentingViewController.view];
289326 [activityView startAnimating ];
@@ -347,4 +384,22 @@ - (FBSDKLoginManager *)createLoginManager {
347384 return [[FBSDKLoginManager alloc ] init ];
348385}
349386
387+ - (BOOL )maybeHandleCancelledResult : (FBSDKLoginManagerLoginResult *)result
388+ error : (NSError *)error {
389+ if (error) {
390+ NSError *newError =
391+ [FUIAuthErrorUtils providerErrorWithUnderlyingError: error
392+ providerID: FIRFacebookAuthProviderID];
393+ [self completeSignInFlowWithAccessToken: nil idToken: nil error: newError];
394+ return true ;
395+ }
396+
397+ if (result.isCancelled ) {
398+ NSError *newError = [FUIAuthErrorUtils userCancelledSignInError ];
399+ [self completeSignInFlowWithAccessToken: nil idToken: nil error: newError];
400+ return true ;
401+ }
402+ return false ;
403+ }
404+
350405@end
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