add "Enforce e2ee" switch

CHANGELOG.md

@@ -19,6 +19,7 @@
 * Allow to open links in messages via actions in TalkBack menu
 * Allow to open map if user clicks "Location streaming enabled" system message
 * Allow to disable incoming calls notifications
+* Add an option to process unencrypted messages; by default, only encrypted messages can be sent or received
 * Fix: do not accidentally set draft in chats that don't allow sending messages
 * Fix swipe navigation between tabs in RTL languages
 * Remove legacy option

src/main/java/org/thoughtcrime/securesms/connect/DcHelper.java

@@ -55,6 +55,7 @@ public class DcHelper {
   public static final String CONFIG_PRIVATE_TAG = "private_tag";
   public static final String CONFIG_STATS_SENDING = "stats_sending";
   public static final String CONFIG_STATS_ID = "stats_id";
+  public static final String CONFIG_FORCE_ENCRYPTION = "force_encryption";
 
   public static DcContext getContext(@NonNull Context context) {
     return ApplicationContext.getInstance(context).getDcContext();

src/main/java/org/thoughtcrime/securesms/relay/EditRelayActivity.java

@@ -23,6 +23,7 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.widget.SwitchCompat;
 import androidx.constraintlayout.widget.Group;
 import chat.delta.rpc.Rpc;
 import chat.delta.rpc.RpcException;
@@ -75,6 +76,7 @@ private enum VerificationType {
   Spinner imapSecurity;
   Spinner smtpSecurity;
   Spinner certCheck;
+  private SwitchCompat enforceE2eeSwitch;
 
   Rpc rpc;
   int accId;
@@ -110,6 +112,7 @@ public void onCreate(Bundle bundle) {
     imapSecurity = findViewById(R.id.imap_security);
     smtpSecurity = findViewById(R.id.smtp_security);
     certCheck = findViewById(R.id.cert_check);
+    enforceE2eeSwitch = findViewById(R.id.enforce_e2ee_switch);
 
     String addr = getIntent().getStringExtra(EXTRA_ADDR);
     EnteredLoginParam config = null;
@@ -173,6 +176,10 @@ public void afterTextChanged(Editable s) {
     boolean expandAdvanced = false;
     int intVal;
 
+    intVal = getContext(this).getConfigInt(DcHelper.CONFIG_FORCE_ENCRYPTION);
+    enforceE2eeSwitch.setChecked(intVal == 1);
+    expandAdvanced = expandAdvanced || intVal == 0;
+
     if (config != null) { // configured
       emailInput.setText(config.addr);
       if (!TextUtils.isEmpty(config.addr)) {
@@ -500,9 +507,12 @@ private void setupConfig() {
     param.smtpPassword = getParam(R.id.smtp_password_text, false);
     param.certificateChecks = certificateChecksFromInt(certCheck.getSelectedItemPosition());
 
+    final String forceEncryption = enforceE2eeSwitch.isChecked() ? "1" : "0";
+
     new Thread(
             () -> {
               try {
+                rpc.setConfig(accId, DcHelper.CONFIG_FORCE_ENCRYPTION, forceEncryption);
                 rpc.addOrUpdateTransport(accId, param);
                 DcHelper.getEventCenter(this).endCaptureNextError();
                 progressDialog.dismiss();

src/main/res/layout/activity_edittransport.xml

@@ -129,7 +129,7 @@
                 android:visibility="gone"
                 tools:visibility="visible"
                 app:constraint_referenced_ids="inbox, imap_login, imap_server, imap_port, imap_security_label, imap_security, outbox_view_spacer_top,
-            outbox, smtp_login, smtp_password, smtp_server, smtp_port, smtp_security_label, smtp_security, cert_check_label, cert_check, view_log_button" />
+            outbox, smtp_login, smtp_password, smtp_server, smtp_port, smtp_security_label, smtp_security, cert_check_label, cert_check, view_log_button, enforce_e2ee_switch" />
 
             <ImageView
                 android:id="@+id/advanced_icon"
@@ -362,6 +362,17 @@
                 app:layout_constraintStart_toStartOf="@id/guideline_root_start"
                 app:layout_constraintTop_toBottomOf="@id/cert_check_label" />
 
+            <androidx.appcompat.widget.SwitchCompat
+                android:id="@+id/enforce_e2ee_switch"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:paddingTop="16dp"
+                android:paddingBottom="16dp"
+                android:text="@string/enforce_e2ee"
+                app:layout_constraintEnd_toEndOf="@id/guideline_root_end"
+                app:layout_constraintStart_toStartOf="@id/guideline_root_start"
+                app:layout_constraintTop_toBottomOf="@id/cert_check" />
+
             <TextView
                 android:id="@+id/view_log_button"
                 android:layout_width="0dp"
@@ -375,7 +386,7 @@
                 android:paddingBottom="32dp"
                 app:layout_constraintEnd_toEndOf="@id/guideline_root_end"
                 app:layout_constraintStart_toStartOf="@id/guideline_root_start"
-                app:layout_constraintTop_toBottomOf="@id/cert_check" />
+                app:layout_constraintTop_toBottomOf="@id/enforce_e2ee_switch" />
 
         </androidx.constraintlayout.widget.ConstraintLayout>
 

src/main/res/values/strings.xml

@@ -673,7 +673,7 @@
     <string name="welcome_chat_over_email">Secure Decentralized Chat</string>
     <string name="scan_invitation_code">Scan Invitation Code</string>
     <string name="login_title">Log In</string>
-    <string name="login_advanced_hint">This login is for advanced users:\n\n• Do not use an address you\'re using in another app.\n\n• Classic email server allow chats without end-to-end encryption marked by a mail icon.</string>
+    <string name="login_advanced_hint">This login is for advanced users.\n\nDo not use an address you\'re using in another app.</string>
     <string name="login_inbox">Inbox</string>
     <string name="login_imap_login">IMAP Login Name</string>
     <string name="login_imap_server">IMAP Server</string>
@@ -708,6 +708,7 @@
     <string name="used_for_sending">Used for sending</string>
     <string name="hide_from_contacts">Hide from Contacts</string>
     <string name="hidden_from_contacts">Hidden from contacts</string>
+    <string name="enforce_e2ee">Enforce Encryption for All Relays</string>
     <!-- Hint for the list of relays -->
     <string name="transport_list_hint">Messages are received on all relays.\n\n⚠️ If you change anything here, make sure all your devices run at least version 2.47.0. Otherwise older devices may miss messages.</string>
     <!-- shown if a QR code was scanned that can be used as a relay -->