react-native-firebase/ios/RNFirebase/RNFirebaseAuth.m

#import "RNFirebaseAuth.h"
#import "RNFirebaseErrors.h"
#import "RNFirebaseEvents.h"

@implementation RNFirebaseAuth

RCT_EXPORT_MODULE(RNFirebaseAuth);

/**
 addAuthStateListener
 
 */
RCT_EXPORT_METHOD(addAuthStateListener) {
    self->listening = true;
    self->authListenerHandle = [[FIRAuth auth] addAuthStateDidChangeListener:^(FIRAuth *_Nonnull auth, FIRUser *_Nullable user) {
        if (user != nil) {
            [self sendJSEvent:AUTH_CHANGED_EVENT props: @{ @"authenticated": @(true),@"user": [self firebaseUserToDict:user] }];
        } else {
            [self sendJSEvent:AUTH_CHANGED_EVENT props:@{ @"authenticated": @(false) }];
        }
    }];
}

/**
 removeAuthStateListener
 
 */
RCT_EXPORT_METHOD(removeAuthStateListener) {
    if (self->authListenerHandle != nil) {
        [[FIRAuth auth] removeAuthStateDidChangeListener:self->authListenerHandle];
        self->listening = false;
    }
}

/**
 signOut
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(signOut:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        NSError *error;
        [[FIRAuth auth] signOut:&error];
        if (!error) [self promiseNoUser:resolve rejecter:reject isError:NO];
        else [self promiseRejectAuthException:reject error:error];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}


/**
 signInAnonymously
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(signInAnonymously:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    [[FIRAuth auth] signInAnonymouslyWithCompletion:^(FIRUser *user, NSError *error) {
        if (error) {
            [self promiseRejectAuthException:reject error:error];
        } else {
            [self promiseWithUser:resolve rejecter:reject user:user];
        }
    }];
    
}

/**
 signInWithEmailAndPassword
 
 @param NSString NSString email
 @param NSString NSString password
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(signInWithEmailAndPassword:(NSString *)email pass:(NSString *)password resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    [[FIRAuth auth] signInWithEmail:email password:password completion:^(FIRUser *user, NSError *error) {
        if (error) {
            [self promiseRejectAuthException:reject error:error];
        } else {
            [self promiseWithUser:resolve rejecter:reject user:user];
        }
    }];
}

/**
 createUserWithEmailAndPassword
 
 @param NSString NSString email
 @param NSString NSString password
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(createUserWithEmailAndPassword:(NSString *)email pass:(NSString *)password resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    [[FIRAuth auth] createUserWithEmail:email password:password completion:^(FIRUser *user, NSError *error) {
        if (error) {
            [self promiseRejectAuthException:reject error:error];
        } else {
            [self promiseWithUser:resolve rejecter:reject user:user];
        }
    }];
}

/**
 deleteUser
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(delete:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user deleteWithCompletion:^(NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                [self promiseNoUser:resolve rejecter:reject isError:NO];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 reload
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(reload:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user reloadWithCompletion:^(NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                FIRUser *userAfterReload = [FIRAuth auth].currentUser;
                [self promiseWithUser:resolve rejecter:reject user:userAfterReload];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 sendEmailVerification
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(sendEmailVerification:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user sendEmailVerificationWithCompletion:^(NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                [self promiseNoUser:resolve rejecter:reject isError:NO];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 updateEmail
 
 @param NSString email
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(updateEmail:(NSString *) email resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user updateEmail:email completion:^(NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                FIRUser *userAfterUpdate = [FIRAuth auth].currentUser;
                [self promiseWithUser:resolve rejecter:reject user:userAfterUpdate];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 updatePassword
 
 @param NSString password
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(updatePassword:(NSString *) password resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user updatePassword:password completion:^(NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                FIRUser *userAfterUpdate = [FIRAuth auth].currentUser;
                [self promiseWithUser:resolve rejecter:reject user:userAfterUpdate];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 updateProfile
 
 @param NSDictionary props
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return return
 */
RCT_EXPORT_METHOD(updateProfile:(NSDictionary *) props resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        FIRUserProfileChangeRequest *changeRequest = [user profileChangeRequest];
        NSMutableArray *allKeys = [[props allKeys] mutableCopy];
        
        for (NSString *key in allKeys) {
            @try {
                if ([key isEqualToString:@"photoURL"]) {
                    NSURL *url = [NSURL URLWithString:[props valueForKey:key]];
                    [changeRequest setValue:url forKey:key];
                } else {
                    [changeRequest setValue:[props objectForKey:key] forKey:key];
                }
            } @catch (NSException *exception) {
                NSLog(@"Exception occurred while configuring: %@", exception);
            }
        }
        
        [changeRequest commitChangesWithCompletion:^(NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                FIRUser *userAfterUpdate = [FIRAuth auth].currentUser;
                [self promiseWithUser:resolve rejecter:reject user:userAfterUpdate];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}


/**
 getToken
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(getToken:(BOOL)forceRefresh resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user getTokenForcingRefresh:(BOOL) forceRefresh completion:^(NSString *token, NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                resolve(token);
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 signInWithCredential
 
 @param NSString provider
 @param NSString authToken
 @param NSString authSecret
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(signInWithCredential:(NSString *)provider token:(NSString *)authToken secret:(NSString *)authSecret resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRAuthCredential *credential = [self getCredentialForProvider:provider token:authToken secret:authSecret];
    
    if (credential == nil) {
        return reject(@"auth/invalid-credential", @"The supplied auth credential is malformed, has expired or is not currently supported.", nil);
    }
    
    [[FIRAuth auth] signInWithCredential:credential completion:^(FIRUser *user, NSError *error) {
        if (error) {
            [self promiseRejectAuthException:reject error:error];
        } else {
            [self promiseWithUser:resolve rejecter:reject user:user];
        }
    }];
}

/**
 sendPasswordResetEmail
 
 @param NSString email
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(sendPasswordResetEmail:(NSString *)email resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    [[FIRAuth auth] sendPasswordResetWithEmail:email completion:^(NSError *_Nullable error) {
        if (error) {
            [self promiseRejectAuthException:reject error:error];
        } else {
            [self promiseNoUser:resolve rejecter:reject isError:NO];
        }
    }];
}

/**
 getCurrentUser
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(getCurrentUser:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRUser *user = [FIRAuth auth].currentUser;
    [self promiseWithUser:resolve rejecter:reject user:user];
}


/**
 signInWithCustomToken
 
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(signInWithCustomToken: (NSString *)customToken resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    [[FIRAuth auth] signInWithCustomToken:customToken completion:^(FIRUser *user, NSError *error) {
        if (error) {
            [self promiseRejectAuthException:reject error:error];
        } else {
            [self promiseWithUser:resolve rejecter:reject user:user];
        }
    }];
}

/**
 link - *insert zelda joke here*
 
 @param NSString provider
 @param NSString authToken
 @param NSString authSecret
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(link:(NSString *)provider authToken:(NSString *)authToken authSecret:(NSString *)authSecret resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRAuthCredential *credential = [self getCredentialForProvider:provider token:authToken secret:authSecret];
    
    if (credential == nil) {
        return reject(@"auth/invalid-credential", @"The supplied auth credential is malformed, has expired or is not currently supported.", nil);
    }
    
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user linkWithCredential:credential completion:^(FIRUser *_Nullable user, NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                [self promiseWithUser:resolve rejecter:reject user:user];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 reauthenticate
 
 @param NSString provider
 @param NSString authToken
 @param NSString authSecret
 @param RCTPromiseResolveBlock resolve
 @param RCTPromiseRejectBlock reject
 @return
 */
RCT_EXPORT_METHOD(reauthenticate:(NSString *)provider authToken:(NSString *)authToken authSecret:(NSString *)authSecret resolver:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject) {
    FIRAuthCredential *credential = [self getCredentialForProvider:provider token:authToken secret:authSecret];
    
    if (credential == nil) {
        return reject(@"auth/invalid-credential", @"The supplied auth credential is malformed, has expired or is not currently supported.", nil);
    }
    
    FIRUser *user = [FIRAuth auth].currentUser;
    
    if (user) {
        [user reauthenticateWithCredential:credential completion:^(NSError *_Nullable error) {
            if (error) {
                [self promiseRejectAuthException:reject error:error];
            } else {
                FIRUser *userAfterAuth = [FIRAuth auth].currentUser;
                [self promiseWithUser:resolve rejecter:reject user:userAfterAuth];
            }
        }];
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
}

/**
 getCredentialForProvider
 
 @param provider
 @param authToken
 @param authTokenSecret
 @return FIRAuthCredential
 */
- (FIRAuthCredential *)getCredentialForProvider:(NSString *)provider token:(NSString *)authToken secret:(NSString *)authTokenSecret {
    FIRAuthCredential *credential;
    
    if ([provider compare:@"twitter" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
        credential = [FIRTwitterAuthProvider credentialWithToken:authToken secret:authTokenSecret];
    } else if ([provider compare:@"facebook" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
        credential = [FIRFacebookAuthProvider credentialWithAccessToken:authToken];
    } else if ([provider compare:@"google" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
        credential = [FIRGoogleAuthProvider credentialWithIDToken:authToken accessToken:authTokenSecret];
    } else if ([provider compare:@"password" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
        credential = [FIREmailPasswordAuthProvider credentialWithEmail:authToken password:authTokenSecret];
    } else if ([provider compare:@"github" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
        credential = [FIRGitHubAuthProvider credentialWithToken:authToken];
    } else {
        NSLog(@"Provider not yet handled: %@", provider);
    }
    
    return credential;
}



/**
 Resolve or reject a promise based on isError value
 
 @param resolve RCTPromiseResolveBlock
 @param reject RCTPromiseRejectBlock
 @param isError BOOL
 */
- (void) promiseNoUser:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject isError:(BOOL) isError {
    if (isError) {
        reject(@"auth/no_current_user", @"No user currently signed in.", nil);
    } else {
        resolve([NSNull null]);
    }
}

/**
 Reject a promise with an auth exception
 
 @param reject RCTPromiseRejectBlock
 @param error NSError
 */
- (void) promiseRejectAuthException:(RCTPromiseRejectBlock) reject error:(NSError *)error {
    NSString *code = @"auth/unknown";
    NSString *message = [error localizedDescription];
    
    switch (error.code) {
        case FIRAuthErrorCodeInvalidCustomToken:
            code = @"auth/invalid-custom-token";
            message = @"The custom token format is incorrect. Please check the documentation.";
            break;
        case FIRAuthErrorCodeCustomTokenMismatch:
            code = @"auth/custom-token-mismatch";
            message = @"The custom token corresponds to a different audience.";
            break;
        case FIRAuthErrorCodeInvalidCredential:
            code = @"auth/invalid-credential";
            message = @"The supplied auth credential is malformed or has expired.";
            break;
        case FIRAuthErrorCodeInvalidEmail:
            code = @"auth/invalid-email";
            message = @"The email address is badly formatted.";
            break;
        case FIRAuthErrorCodeWrongPassword:
            code = @"auth/wrong-password";
            message = @"The password is invalid or the user does not have a password.";
            break;
        case FIRAuthErrorCodeUserMismatch:
            code = @"auth/user-mismatch";
            message = @"The supplied credentials do not correspond to the previously signed in user.";
            break;
        case FIRAuthErrorCodeRequiresRecentLogin:
            code = @"auth/requires-recent-login";
            message = @"This operation is sensitive and requires recent authentication. Log in again before retrying this request.";
            break;
        case FIRAuthErrorCodeAccountExistsWithDifferentCredential:
            code = @"auth/account-exists-with-different-credential";
            message = @"An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address.";
            break;
        case FIRAuthErrorCodeEmailAlreadyInUse:
            code = @"auth/email-already-in-use";
            message = @"The email address is already in use by another account.";
            break;
        case FIRAuthErrorCodeCredentialAlreadyInUse:
            code = @"auth/credential-already-in-use";
            message = @"This credential is already associated with a different user account.";
            break;
        case FIRAuthErrorCodeUserDisabled:
            code = @"auth/user-disabled";
            message = @"The user account has been disabled by an administrator.";
            break;
        case FIRAuthErrorCodeUserTokenExpired:
            code = @"auth/user-token-expired";
            message = @"The user's credential is no longer valid. The user must sign in again.";
            break;
        case FIRAuthErrorCodeUserNotFound:
            code = @"auth/user-not-found";
            message = @"There is no user record corresponding to this identifier. The user may have been deleted.";
            break;
        case FIRAuthErrorCodeInvalidUserToken:
            code = @"auth/invalid-user-token";
            message = @"The user's credential is no longer valid. The user must sign in again.";
            break;
        case FIRAuthErrorCodeWeakPassword:
            code = @"auth/weak-password";
            message = @"The given password is invalid.";
            break;
        case FIRAuthErrorCodeOperationNotAllowed:
            code = @"auth/operation-not-allowed";
            message = @"This operation is not allowed. You must enable this service in the console.";
            break;
        case FIRAuthErrorCodeNetworkError:
            code = @"auth/network-error";
            message = @"A network error has occurred, please try again.";
            break;
        case FIRAuthErrorCodeInternalError:
            code = @"auth/internal-error";
            message = @"An internal error has occurred, please try again.";
            break;
            
            // unsure of the below codes so leaving them as the default error message
        case FIRAuthErrorCodeTooManyRequests:
            code = @"auth/too-many-requests";
            break;
        case FIRAuthErrorCodeProviderAlreadyLinked:
            code = @"auth/provider-already-linked";
            break;
        case FIRAuthErrorCodeNoSuchProvider:
            code = @"auth/no-such-provider";
            break;
        case FIRAuthErrorCodeInvalidAPIKey:
            code = @"auth/invalid-api-key";
            break;
        case FIRAuthErrorCodeAppNotAuthorized:
            code = @"auth/app-not-authorised";
            break;
        case FIRAuthErrorCodeExpiredActionCode:
            code = @"auth/expired-action-code";
            break;
        case FIRAuthErrorCodeInvalidMessagePayload:
            code = @"auth/invalid-message-payload";
            break;
        case FIRAuthErrorCodeInvalidSender:
            code = @"auth/invalid-sender";
            break;
        case FIRAuthErrorCodeInvalidRecipientEmail:
            code = @"auth/invalid-recipient-email";
            break;
        case FIRAuthErrorCodeKeychainError:
            code = @"auth/keychain-error";
            break;
        default:
            break;
    }
    
    reject(code, message, error);
}

/**
 Resolve or reject a promise based on FIRUser value existance
 
 @param resolve RCTPromiseResolveBlock
 @param reject RCTPromiseRejectBlock
 @param user FIRUser
 */
- (void) promiseWithUser:(RCTPromiseResolveBlock) resolve rejecter:(RCTPromiseRejectBlock) reject user:(FIRUser *) user {
    if (user) {
        NSDictionary *userDict = [self firebaseUserToDict:user];
        resolve(userDict);
    } else {
        [self promiseNoUser:resolve rejecter:reject isError:YES];
    }
    
}


/**
 wrapper for sendEventWithName for auth events
 
 @param title sendEventWithName
 @param props <#props description#>
 */
- (void) sendJSEvent:(NSString *)title props:(NSDictionary *)props {
    @try {
        if (self->listening) {
            [self sendEventWithName:title body:props];
        }
    }
    @catch (NSException *error) {
        NSLog(@"An error occurred in sendJSEvent: %@", [error debugDescription]);
    }
}


/**
 Converts a FIRUser instance into a dictionary to send via RNBridge
 
 @param user FIRUser
 @return NSDictionary
 */
- (NSDictionary *) firebaseUserToDict:(FIRUser *) user {
    NSMutableDictionary *userDict = [
                                     @{ @"uid": user.uid,
                                        @"email": user.email ? user.email : [NSNull null],
                                        @"emailVerified": @(user.emailVerified),
                                        @"isAnonymous": @(user.anonymous),
                                        @"displayName": user.displayName ? user.displayName : [NSNull null],
                                        @"refreshToken": user.refreshToken,
                                        @"providerId": [user.providerID lowercaseString]
                                        }
                                     mutableCopy
                                     ];
    
    // todo providerData
    
    if ([user valueForKey:@"photoURL"] != nil) {
        [userDict setValue: [NSString stringWithFormat:@"%@", user.photoURL] forKey:@"photoURL"];
    }
    
    return userDict;
}

- (NSArray<NSString *> *)supportedEvents {
    return @[AUTH_CHANGED_EVENT, AUTH_ANONYMOUS_ERROR_EVENT, AUTH_ERROR_EVENT];
}

@end