Improve UX for multiple “no longer verified” members of a group.

// FREEBIE

Signal/src/ViewControllers/ConversationView/MessagesViewController.m

@@ -844,6 +844,12 @@ typedef enum : NSUInteger {
 - (void)noLongerVerifiedBannerViewWasTapped:(UIGestureRecognizer *)sender
 {
     if (sender.state == UIGestureRecognizerStateRecognized) {
+        NSArray<NSString *> *noLongerVerifiedRecipientIds = [self noLongerVerifiedRecipientIds];
+        if (noLongerVerifiedRecipientIds.count < 1) {
+            return;
+        }
+        BOOL hasMultiple = noLongerVerifiedRecipientIds.count > 1;
+
         UIAlertController *actionSheetController =
             [UIAlertController alertControllerWithTitle:nil
                                                 message:nil
@@ -851,12 +857,14 @@ typedef enum : NSUInteger {
 
         __weak MessagesViewController *weakSelf = self;
         UIAlertAction *verifyAction = [UIAlertAction
-            actionWithTitle:
+            actionWithTitle:(hasMultiple ? NSLocalizedString(@"VERIFY_PRIVACY_MULTIPLE",
-                NSLocalizedString(@"VERIFY_PRIVACY",
+                                               @"Label for button or row which allows users to verify the safety "
-                    @"Label for button or row which allows users to verify the safety number of another user.")
+                                               @"numbers of multiple users.")
-                      style:UIAlertActionStyleDefault
+                                         : NSLocalizedString(@"VERIFY_PRIVACY",
+                                               @"Label for button or row which allows users to verify the safety "
+                                               @"number of another user."))style:UIAlertActionStyleDefault
                     handler:^(UIAlertAction *_Nonnull action) {
-                        [weakSelf showConversationSettingsAndShowVerification:YES];
+                        [weakSelf showNoLongerVerifiedUI];
                     }];
         [actionSheetController addAction:verifyAction];
 
@@ -1952,6 +1960,18 @@ typedef enum : NSUInteger {
 
 #pragma mark - Actions
 
+- (void)showNoLongerVerifiedUI
+{
+    NSArray<NSString *> *noLongerVerifiedRecipientIds = [self noLongerVerifiedRecipientIds];
+    if (noLongerVerifiedRecipientIds.count > 1) {
+        [self showConversationSettingsAndShowVerification:YES];
+    } else if (noLongerVerifiedRecipientIds.count == 1) {
+        // Pick one in an arbitrary but deterministic manner.
+        NSString *recipientId = noLongerVerifiedRecipientIds.lastObject;
+        [self showFingerprintWithRecipientId:recipientId];
+    }
+}
+
 - (void)showConversationSettings
 {
     [self showConversationSettingsAndShowVerification:NO];

Signal/src/ViewControllers/ShowGroupMembersViewController.m

@@ -121,24 +121,60 @@ NS_ASSUME_NONNULL_BEGIN
 
     OWSTableContents *contents = [OWSTableContents new];
 
-    __weak ShowGroupMembersViewController *weakSelf = self;
     ContactsViewHelper *helper = self.contactsViewHelper;
 
+    OWSTableSection *membersSection = [OWSTableSection new];
+
     // Group Members
 
-    OWSTableSection *section = [OWSTableSection new];
+    // If there are "no longer verified" members of the group,
+    // highlight them in a special section.
+    NSSet<NSString *> *noLongerVerifiedRecipientIds = [NSSet setWithArray:[self noLongerVerifiedRecipientIds]];
+    if (noLongerVerifiedRecipientIds.count > 0) {
+        OWSTableSection *noLongerVerifiedSection = [OWSTableSection new];
+        noLongerVerifiedSection.headerTitle = NSLocalizedString(@"GROUP_MEMBERS_SECTION_TITLE_NO_LONGER_VERIFIED",
+            @"Title for the 'no longer verified' section of the 'group members' view.");
+        membersSection.headerTitle = NSLocalizedString(
+            @"GROUP_MEMBERS_SECTION_TITLE_MEMBERS", @"Title for the 'members' section of the 'group members' view.");
+        [self addMembers:noLongerVerifiedRecipientIds.allObjects
+                               toSection:noLongerVerifiedSection
+            noLongerVerifiedRecipientIds:noLongerVerifiedRecipientIds];
+        [contents addSection:noLongerVerifiedSection];
+    }
 
     NSMutableSet *memberRecipientIds = [self.memberRecipientIds mutableCopy];
     [memberRecipientIds removeObject:[helper localNumber]];
-    for (NSString *recipientId in [memberRecipientIds.allObjects sortedArrayUsingSelector:@selector(compare:)]) {
+    [self addMembers:memberRecipientIds.allObjects
+                           toSection:membersSection
+        noLongerVerifiedRecipientIds:noLongerVerifiedRecipientIds];
+    [contents addSection:membersSection];
+
+    self.contents = contents;
+}
+
+- (void)addMembers:(NSArray<NSString *> *)recipientIds
+                       toSection:(OWSTableSection *)section
+    noLongerVerifiedRecipientIds:(NSSet<NSString *> *)noLongerVerifiedRecipientIds
+{
+    OWSAssert(recipientIds);
+    OWSAssert(section);
+    OWSAssert(noLongerVerifiedRecipientIds);
+
+    __weak ShowGroupMembersViewController *weakSelf = self;
+    ContactsViewHelper *helper = self.contactsViewHelper;
+    for (NSString *recipientId in [recipientIds sortedArrayUsingSelector:@selector(compare:)]) {
         [section addItem:[OWSTableItem itemWithCustomCellBlock:^{
             ShowGroupMembersViewController *strongSelf = weakSelf;
             OWSAssert(strongSelf);
 
             ContactTableViewCell *cell = [ContactTableViewCell new];
             SignalAccount *signalAccount = [helper signalAccountForRecipientId:recipientId];
+            BOOL isNoLongerVerified = [noLongerVerifiedRecipientIds containsObject:recipientId];
             BOOL isBlocked = [helper isRecipientIdBlocked:recipientId];
-            if (isBlocked) {
+            if (isNoLongerVerified) {
+                cell.accessoryMessage = NSLocalizedString(
+                    @"CONTACT_CELL_IS_NO_LONGER_VERIFIED", @"An indicator that a contact is no longer verified.");
+            } else if (isBlocked) {
                 cell.accessoryMessage
                     = NSLocalizedString(@"CONTACT_CELL_IS_BLOCKED", @"An indicator that a contact has been blocked.");
             }
@@ -162,9 +198,19 @@ NS_ASSUME_NONNULL_BEGIN
                                  [weakSelf didSelectRecipientId:recipientId];
                              }]];
     }
-    [contents addSection:section];
+}
 
-    self.contents = contents;
+// Returns a collection of the group members who are "no longer verified".
+- (NSArray<NSString *> *)noLongerVerifiedRecipientIds
+{
+    NSMutableArray<NSString *> *result = [NSMutableArray new];
+    for (NSString *recipientId in self.thread.recipientIdentifiers) {
+        if ([[OWSIdentityManager sharedManager] verificationStateForRecipientId:recipientId]
+            == OWSVerificationStateNoLongerVerified) {
+            [result addObject:recipientId];
+        }
+    }
+    return [result copy];
 }
 
 - (void)didSelectRecipientId:(NSString *)recipientId

Signal/translations/en.lproj/Localizable.strings

@@ -268,6 +268,9 @@
 /* An indicator that a contact has been blocked. */
 "CONTACT_CELL_IS_BLOCKED" = "Blocked";
 
+/* An indicator that a contact is no longer verified. */
+"CONTACT_CELL_IS_NO_LONGER_VERIFIED" = "Not Verified";
+
 /* No comment provided by engineer. */
 "CONTACT_DETAIL_COMM_TYPE_INSECURE" = "Unregistered Number";
 
@@ -577,6 +580,12 @@
 /* Button label for the 'call group member' button */
 "GROUP_MEMBERS_CALL" = "Call";
 
+/* Title for the 'members' section of the 'group members' view. */
+"GROUP_MEMBERS_SECTION_TITLE_MEMBERS" = "Members";
+
+/* Title for the 'no longer verified' section of the 'group members' view. */
+"GROUP_MEMBERS_SECTION_TITLE_NO_LONGER_VERIFIED" = "No Longer Marked as Verified";
+
 /* Button label for the 'send message to group member' button */
 "GROUP_MEMBERS_SEND_MESSAGE" = "Send Message";
 
@@ -1441,6 +1450,9 @@
 /* Label for button or row which allows users to verify the safety number of another user. */
 "VERIFY_PRIVACY" = "Show Safety Number";
 
+/* Label for button or row which allows users to verify the safety numbers of multiple users. */
+"VERIFY_PRIVACY_MULTIPLE" = "Review Safety Numbers";
+
 /* Indicates how to cancel a voice message. */
 "VOICE_MESSAGE_CANCEL_INSTRUCTIONS" = "Slide to Cancel";