Show an error when profile name is too long.

// FREEBIE

Signal/src/Profiles/OWSProfileManager.h

@@ -45,6 +45,8 @@ extern const NSUInteger kOWSProfileManager_MaxAvatarDiameter;
                        success:(void (^)())successBlock
                        failure:(void (^)())failureBlock;
 
+- (BOOL)isProfileNameTooLong:(nullable NSString *)profileName;
+
 #pragma mark - Profile Whitelist
 
 #ifdef DEBUG

Signal/src/Profiles/OWSProfileManager.m

@@ -1198,6 +1198,14 @@ const NSUInteger kOWSProfileManager_MaxAvatarDiameter = 640;
     return [self encryptProfileData:data profileKey:self.localProfileKey];
 }
 
+- (BOOL)isProfileNameTooLong:(nullable NSString *)profileName
+{
+    OWSAssert([NSThread isMainThread]);
+
+    NSData *nameData = [profileName dataUsingEncoding:NSUTF8StringEncoding];
+    return nameData.length > kOWSProfileManager_NameDataLength;
+}
+
 - (nullable NSData *)encryptProfileNameWithUnpaddedName:(NSString *)name
 {
     NSData *nameData = [name dataUsingEncoding:NSUTF8StringEncoding];

Signal/src/ViewControllers/ProfileViewController.m

@@ -369,6 +369,15 @@ NSString *const kProfileView_LastPresentedDate = @"kProfileView_LastPresentedDat
 {
     __weak ProfileViewController *weakSelf = self;
 
+    NSString *normalizedProfileName = [self normalizedProfileName];
+    if ([OWSProfileManager.sharedManager isProfileNameTooLong:normalizedProfileName]) {
+        [OWSAlerts showAlertWithTitle:NSLocalizedString(@"ALERT_ERROR_TITLE", @"")
+                              message:NSLocalizedString(@"PROFILE_VIEW_ERROR_PROFILE_NAME_TOO_LONG",
+                                          @"Error message shown when user tries to update profile with a profile name "
+                                          @"that is too long.")];
+        return;
+    }
+
     // Show an activity indicator to block the UI during the profile upload.
     UIAlertController *alertController = [UIAlertController
         alertControllerWithTitle:NSLocalizedString(@"PROFILE_VIEW_SAVING",
@@ -379,7 +388,7 @@ NSString *const kProfileView_LastPresentedDate = @"kProfileView_LastPresentedDat
     [self presentViewController:alertController
                        animated:YES
                      completion:^{
-                         [OWSProfileManager.sharedManager updateLocalProfileName:[self normalizedProfileName]
+                         [OWSProfileManager.sharedManager updateLocalProfileName:normalizedProfileName
                              avatarImage:self.avatar
                              success:^{
                                  [alertController dismissViewControllerAnimated:NO

Signal/translations/en.lproj/Localizable.strings

@@ -1090,6 +1090,9 @@
 /* Label for action that clear's the user's profile avatar */
 "PROFILE_VIEW_CLEAR_AVATAR" = "Clear Avatar";
 
+/* Error message shown when user tries to update profile with a profile name that is too long. */
+"PROFILE_VIEW_ERROR_PROFILE_NAME_TOO_LONG" = "Your profile name is too long.";
+
 /* Error message shown when a profile update fails. */
 "PROFILE_VIEW_ERROR_UPDATE_FAILED" = "Profile update failed.";
 
@@ -1114,9 +1117,6 @@
 /* Alert title that indicates the user's profile view is being saved. */
 "PROFILE_VIEW_SAVING" = "Saving...";
 
-/* Button to skip the profile view in the registration workflow. */
-"PROFILE_VIEW_SKIP_BUTTON" = "Skip";
-
 /* Title for the profile view. */
 "PROFILE_VIEW_TITLE" = "Profile";