Error changes

FirebaseAuth/Sources/Backend/FIRAuthBackend.m

@@ -551,6 +551,12 @@
  */
 static NSString *const kInvalidRecaptchaVersion = @"INVALID_RECAPTCHA_VERSION";
 
+/** @var kInvalidLoginCredentials
+    @brief This is the error message the server will respond with if the login credentails is
+   invalid. in the request.
+ */
+static NSString *const kInvalidLoginCredentials = @"INVALID_LOGIN_CREDENTIALS";
+
 /** @var gBackendImplementation
     @brief The singleton FIRAuthBackendImplementation instance to use.
  */
@@ -1641,6 +1647,11 @@ + (nullable NSError *)clientErrorWithServerErrorMessage:(NSString *)serverErrorM
                                     message:serverErrorMessage];
   }
 
+  if ([shortErrorMessage isEqualToString:kInvalidLoginCredentials]) {
+    return [FIRAuthErrorUtils errorWithCode:FIRAuthInternalErrorCodeInvalidLoginCredentials
+                                    message:serverErrorMessage];
+  }
+
   // In this case we handle an error that might be specified in the underlying errors dictionary,
   // the error message in determined based on the @c reason key in the dictionary.
   if (errorDictionary[kErrorsKey]) {

FirebaseAuth/Sources/Public/FirebaseAuth/FIRAuthErrors.h

@@ -458,6 +458,10 @@ typedef NS_ERROR_ENUM(FIRAuthErrorDomain, FIRAuthErrorCode){
      */
     FIRAuthErrorCodeRecaptchaSDKNotLinked = 17208,
 
+    /** Indicates that the long in credentials is invalid.
+     */
+    FIRAuthErrorCodeInvalidLoginCredentials = 17213,
+
     /** Indicates an error occurred while attempting to access the keychain.
      */
     FIRAuthErrorCodeKeychainError = 17995,

FirebaseAuth/Sources/Utilities/FIRAuthErrorUtils.m

@@ -626,6 +626,10 @@
     @"The reCAPTCHA SDK is not linked to your app. See "
     @"https://cloud.google.com/recaptcha-enterprise/docs/instrument-ios-apps";
 
+static NSString *const kFIRAuthErrorMessageInvalidLoginCredentials =
+    @"Login credentials invalid. It is possible that the email/password combination does not "
+    @"exist.";
+
 /** @var FIRAuthErrorDescription
     @brief The error descrioption, based on the error code.
     @remarks No default case so that we get a compiler warning if a new value was added to the enum.
@@ -810,6 +814,8 @@
       return kFIRAuthErrorMessageInvalidReqType;
     case FIRAuthErrorCodeRecaptchaSDKNotLinked:
       return kFIRAuthErrorMessageRecaptchaSDKNotLinked;
+    case FIRAuthErrorCodeInvalidLoginCredentials:
+      return kFIRAuthErrorMessageInvalidLoginCredentials;
   }
 }
 
@@ -997,6 +1003,8 @@
       return @"ERROR_INVALID_REQ_TYPE";
     case FIRAuthErrorCodeRecaptchaSDKNotLinked:
       return @"ERROR_RECAPTCHA_SDK_NOT_LINKED";
+    case FIRAuthErrorCodeInvalidLoginCredentials:
+      return @"ERROR_INVALID_LOGIN_CREDENTIALS";
   }
 }
 

FirebaseAuth/Sources/Utilities/FIRAuthInternalErrors.h

@@ -497,6 +497,11 @@ typedef NS_ENUM(NSInteger, FIRAuthInternalErrorCode) {
   FIRAuthInternalErrorCodeRecaptchaNotEnabled = FIRAuthPublicErrorCodeFlag |
                                                 FIRAuthErrorCodeRecaptchaNotEnabled,
 
+  /** Indicates that the login credentials is invalid.
+   */
+  FIRAuthInternalErrorCodeInvalidLoginCredentials = FIRAuthPublicErrorCodeFlag |
+                                                    FIRAuthErrorCodeInvalidLoginCredentials,
+
   /** Indicates that the recaptcha sdk is not linked to the app.
    */
   FIRAuthInternalErrorCodeRecaptchaSDKNotLinked = FIRAuthPublicErrorCodeFlag |