[ios] Adjust the UI if exceptional allowed popups

For the exception section shown in settings -> content settings ->
pop-ups, if there are exceptions set by the policy(AllowedPopupsForUrls)
when pop-ups is blocked, they shouldn't be editable. At the same time,
if there are some exceptional allowed popups set by the user, they
remain editable. If all allowed popups urls are set by the policy, then
the "edit" button on the top right of the page should be disabled.

The UI and behaviour of the exception section is the same with above if
DefaultPopupsSetting is set to "2" (block).

Bug: 1142620
Change-Id: I0948acccc3bdf78be277b818a8f01a119a51856a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500252Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821772}

ios/chrome/browser/ui/settings/block_popups_table_view_controller.mm

@@ -47,6 +47,7 @@ typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypeManaged,
   ItemTypeHeader,
   ItemTypeException,
+  ItemTypeExceptionByPolicy,
 };
 
 }  // namespace
@@ -59,6 +60,9 @@ typedef NS_ENUM(NSInteger, ItemType) {
   // List of url patterns that are allowed to display popups.
   base::ListValue _exceptions;
 
+  // List of url patterns set by policy that are allowed to display popups.
+  base::ListValue _allowPopupsByPolicy;
+
   // The observable boolean that binds to the "Disable Popups" setting state.
   ContentSettingBackedBoolean* _disablePopupsSetting;
 
@@ -131,7 +135,8 @@ typedef NS_ENUM(NSInteger, ItemType) {
         toSectionWithIdentifier:SectionIdentifierMainSwitch];
   }
 
-  if ([self popupsCurrentlyBlocked] && _exceptions.GetSize()) {
+  if ([self popupsCurrentlyBlocked] &&
+      (_exceptions.GetSize() || _allowPopupsByPolicy.GetSize())) {
     [self populateExceptionsItems];
   }
 }
@@ -200,9 +205,12 @@ typedef NS_ENUM(NSInteger, ItemType) {
 
 - (BOOL)tableView:(UITableView*)tableView
     canEditRowAtIndexPath:(NSIndexPath*)indexPath {
-  // Any item in SectionIdentifierExceptions is editable.
-  return [self.tableViewModel sectionIdentifierForSection:indexPath.section] ==
-         SectionIdentifierExceptions;
+  // Only when items are in SectionIdentifierExceptions and are not set by the
+  // policy are editable.
+  return
+      [self.tableViewModel sectionIdentifierForSection:indexPath.section] ==
+          SectionIdentifierExceptions &&
+      [self.tableViewModel itemAtIndexPath:indexPath].type == ItemTypeException;
 }
 
 - (void)tableView:(UITableView*)tableView
@@ -212,7 +220,8 @@ typedef NS_ENUM(NSInteger, ItemType) {
     return;
   [self deleteItemAtIndexPaths:@[ indexPath ]];
   if (![self.tableViewModel
-          hasSectionForSectionIdentifier:SectionIdentifierExceptions]) {
+          hasSectionForSectionIdentifier:SectionIdentifierExceptions] ||
+      !_exceptions.GetSize()) {
     self.navigationItem.rightBarButtonItem.enabled = NO;
   }
 }
@@ -322,7 +331,9 @@ typedef NS_ENUM(NSInteger, ItemType) {
   return [_disablePopupsSetting value];
 }
 
-// Fetch the urls that can display popups and add them to |_exceptions|.
+// Fetch the urls that can display popups and
+// add items set by the user to |_exceptions|,
+// add items set by the policy to |_allowPopupsByPolicy|.
 - (void)populateExceptionsList {
   // The body of this method was mostly copied from
   // chrome/browser/ui/webui/options/content_settings_handler.cc and simplified
@@ -346,7 +357,14 @@ typedef NS_ENUM(NSInteger, ItemType) {
     // wildcard pattern. So only show settings that the user is able to modify.
     if (entries[i].secondary_pattern == ContentSettingsPattern::Wildcard() &&
         entries[i].GetContentSetting() == CONTENT_SETTING_ALLOW) {
+      if (entries[i].source == "policy") {
+        // Add the urls to |_allowPopupsByPolicy| if the allowed urls are set by
+        // the policy.
+        _allowPopupsByPolicy.AppendString(
+            entries[i].primary_pattern.ToString());
+      } else {
         _exceptions.AppendString(entries[i].primary_pattern.ToString());
+      }
     } else {
       LOG(ERROR) << "Secondary content settings patterns are not "
                  << "supported by the content settings UI";
@@ -363,6 +381,7 @@ typedef NS_ENUM(NSInteger, ItemType) {
   header.text = l10n_util::GetNSString(IDS_IOS_POPUPS_ALLOWED);
   [model setHeader:header forSectionWithIdentifier:SectionIdentifierExceptions];
 
+  // Populate the exception items set by the user.
   for (size_t i = 0; i < _exceptions.GetSize(); ++i) {
     std::string allowed_url;
     _exceptions.GetString(i, &allowed_url);
@@ -371,10 +390,20 @@ typedef NS_ENUM(NSInteger, ItemType) {
     item.text = base::SysUTF8ToNSString(allowed_url);
     [model addItem:item toSectionWithIdentifier:SectionIdentifierExceptions];
   }
+
+  // Populate the exception items set by the policy.
+  for (size_t l = 0; l < _allowPopupsByPolicy.GetSize(); ++l) {
+    std::string allowed_url_by_policy;
+    _allowPopupsByPolicy.GetString(l, &allowed_url_by_policy);
+    TableViewDetailTextItem* item = [[TableViewDetailTextItem alloc]
+        initWithType:ItemTypeExceptionByPolicy];
+    item.text = base::SysUTF8ToNSString(allowed_url_by_policy);
+    [model addItem:item toSectionWithIdentifier:SectionIdentifierExceptions];
+  }
 }
 
 - (void)layoutSections:(BOOL)blockPopupsIsOn {
-  BOOL hasExceptions = _exceptions.GetSize();
+  BOOL hasExceptions = _exceptions.GetSize() || _allowPopupsByPolicy.GetSize();
   BOOL exceptionsListShown = [self.tableViewModel
       hasSectionForSectionIdentifier:SectionIdentifierExceptions];