Expose manual censorship circumvention setting.

// FREEBIE

Signal/src/ViewControllers/AdvancedSettingsTableViewController.m

@@ -5,11 +5,12 @@
 #import "AdvancedSettingsTableViewController.h"
 #import "DebugLogger.h"
 #import "Environment.h"
+#import "Pastelog.h"
 #import "PropertyListPreferences.h"
 #import "PushManager.h"
 #import "Signal-Swift.h"
 #import "TSAccountManager.h"
-#import "Pastelog.h"
+#import <SignalServiceKit/OWSSignalService.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -17,6 +18,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic) UISwitch *enableLogSwitch;
 
+@property (nonatomic) UISwitch *enableCensorshipCircumventionSwitch;
+
 @end
 
 #pragma mark -
@@ -28,13 +31,20 @@ NS_ASSUME_NONNULL_BEGIN
     [super loadView];
 
     self.title = NSLocalizedString(@"SETTINGS_ADVANCED_TITLE", @"");
-    
-    self.enableLogSwitch = [[UISwitch alloc] initWithFrame:CGRectZero];
+
+    self.enableLogSwitch = [UISwitch new];
     [self.enableLogSwitch setOn:[PropertyListPreferences loggingIsEnabled]];
     [self.enableLogSwitch addTarget:self
                              action:@selector(didToggleEnableLogSwitch:)
                    forControlEvents:UIControlEventValueChanged];
 
+    self.enableCensorshipCircumventionSwitch = [UISwitch new];
+    [self.enableCensorshipCircumventionSwitch
+        setOn:OWSSignalService.sharedInstance.isCensorshipCircumventionManuallyActivated];
+    [self.enableCensorshipCircumventionSwitch addTarget:self
+                                                 action:@selector(didToggleEnableCensorshipCircumventionSwitch:)
+                                       forControlEvents:UIControlEventValueChanged];
+
     [self observeNotifications];
 
     [self updateTableContents];
@@ -100,10 +110,40 @@ NS_ASSUME_NONNULL_BEGIN
                                                            actionBlock:^{
                                                                [weakSelf syncPushTokens];
                                                            }]];
-
-
     [contents addSection:pushNotificationsSection];
 
+    // Censorship circumvention has certain disadvantages so it should only be
+    // used if necessary.  Therefore:
+    //
+    // * We don't show this setting if the user has a phone number from a censored region -
+    //   censorship circumvention will be auto-activated for this user.
+    // * We don't show this setting if the user is already connected; they're not being
+    //   censored.
+    // * We continue to show this setting so long as it is set to allow users to disable
+    //   it, for example when they leave a censored region.
+    if (!OWSSignalService.sharedInstance.hasCensoredPhoneNumber
+        && (OWSSignalService.sharedInstance.isCensorshipCircumventionManuallyActivated ||
+               [TSSocketManager sharedManager].state != SocketManagerStateOpen)) {
+        OWSTableSection *censorshipSection = [OWSTableSection new];
+        censorshipSection.headerTitle = NSLocalizedString(@"SETTINGS_ADVANCED_CENSORSHIP_CIRCUMVENTION_HEADER",
+            @"Table header for the 'censorship circumvention' section.");
+        censorshipSection.footerTitle = NSLocalizedString(@"SETTINGS_ADVANCED_CENSORSHIP_CIRCUMVENTION_FOOTER",
+            @"Table footer for the 'censorship circumvention' section.");
+        [pushNotificationsSection addItem:[OWSTableItem itemWithCustomCellBlock:^{
+            UITableViewCell *cell = [UITableViewCell new];
+            cell.textLabel.text = NSLocalizedString(
+                @"SETTINGS_ADVANCED_CENSORSHIP_CIRCUMVENTION", @"Label for the  'censorship circumvention' switch.");
+            cell.textLabel.font = [UIFont ows_regularFontWithSize:18.f];
+            cell.textLabel.textColor = [UIColor blackColor];
+
+            cell.accessoryView = self.enableCensorshipCircumventionSwitch;
+            cell.selectionStyle = UITableViewCellSelectionStyleNone;
+            return cell;
+        }
+                                                                    actionBlock:nil]];
+        [contents addSection:censorshipSection];
+    }
+
     self.contents = contents;
 }
 
@@ -133,6 +173,11 @@ NS_ASSUME_NONNULL_BEGIN
     [self updateTableContents];
 }
 
+- (void)didToggleEnableCensorshipCircumventionSwitch:(UISwitch *)sender
+{
+    OWSSignalService.sharedInstance.isCensorshipCircumventionManuallyActivated = sender.isOn;
+}
+
 #pragma mark - Logging
 
 + (NSString *)tag

Signal/translations/en.lproj/Localizable.strings

@@ -1087,6 +1087,15 @@
 /* Title for the 'add to block list' view. */
 "SETTINGS_ADD_TO_BLOCK_LIST_TITLE" = "Block";
 
+/* Label for the  'censorship circumvention' switch. */
+"SETTINGS_ADVANCED_CENSORSHIP_CIRCUMVENTION" = "Censorship Circumvention";
+
+/* Table footer for the 'censorship circumvention' section. */
+"SETTINGS_ADVANCED_CENSORSHIP_CIRCUMVENTION_FOOTER" = "Do not enable this feature unless you are in a location where Signal is censored.";
+
+/* Table header for the 'censorship circumvention' section. */
+"SETTINGS_ADVANCED_CENSORSHIP_CIRCUMVENTION_HEADER" = "Censorship Circumvention";
+
 /* No comment provided by engineer. */
 "SETTINGS_ADVANCED_DEBUGLOG" = "Enable Debug Log";
 
@@ -1165,7 +1174,7 @@
 /* Short table cell label */
 "SETTINGS_PRIVACY_CALLKIT_TITLE" = "iOS Call Integration";
 
-/* No comment provided by engineer. */
+/* Settings table view cell label */
 "SETTINGS_PRIVACY_TITLE" = "Privacy";
 
 /* Section header */