Option to auto encrypt on reply

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -5496,6 +5496,7 @@ public class FragmentCompose extends FragmentBase {
             boolean resize_reply = prefs.getBoolean("resize_reply", true);
             boolean sign_default = prefs.getBoolean("sign_default", false);
             boolean encrypt_default = prefs.getBoolean("encrypt_default", false);
+            boolean encrypt_reply = prefs.getBoolean("encrypt_reply", false);
             boolean receipt_default = prefs.getBoolean("receipt_default", false);
             boolean write_below = prefs.getBoolean("write_below", false);
             boolean perform_expunge = prefs.getBoolean("perform_expunge", true);
@@ -5981,17 +5982,21 @@ public class FragmentCompose extends FragmentBase {
                             // Encryption
                             List<Address> recipients = data.draft.getAllRecipients();
 
+                            boolean reply = (encrypt_reply && (
+                                    EntityMessage.PGP_SIGNENCRYPT.equals(ref.ui_encrypt) ||
+                                            EntityMessage.SMIME_SIGNENCRYPT.equals(ref.ui_encrypt)));
+
                             if (EntityMessage.PGP_SIGNONLY.equals(ref.ui_encrypt) ||
                                     EntityMessage.PGP_SIGNENCRYPT.equals(ref.ui_encrypt)) {
                                 if (PgpHelper.isOpenKeychainInstalled(context) &&
                                         selected.sign_key != null &&
-                                        PgpHelper.hasPgpKey(context, recipients, true))
+                                        (reply || PgpHelper.hasPgpKey(context, recipients, true)))
                                     data.draft.ui_encrypt = ref.ui_encrypt;
                             } else if (EntityMessage.SMIME_SIGNONLY.equals(ref.ui_encrypt) ||
                                     EntityMessage.SMIME_SIGNENCRYPT.equals(ref.ui_encrypt)) {
                                 if (ActivityBilling.isPro(context) &&
                                         selected.sign_key_alias != null &&
-                                        SmimeHelper.hasSmimeKey(context, recipients, true))
+                                        (reply || SmimeHelper.hasSmimeKey(context, recipients, true)))
                                     data.draft.ui_encrypt = ref.ui_encrypt;
                             }
                         }

app/src/main/java/eu/faircode/email/FragmentOptionsEncryption.java

@@ -88,6 +88,7 @@ public class FragmentOptionsEncryption extends FragmentBase
     private SwitchCompat swSign;
     private SwitchCompat swEncrypt;
     private SwitchCompat swEncryptAuto;
+    private SwitchCompat swEncryptReply;
     private SwitchCompat swAutoVerify;
     private SwitchCompat swAutoDecrypt;
     private SwitchCompat swAutoUndoDecrypt;
@@ -119,7 +120,7 @@ public class FragmentOptionsEncryption extends FragmentBase
     static final int REQUEST_IMPORT_CERTIFICATE = 1;
 
     final static List<String> RESET_OPTIONS = Collections.unmodifiableList(Arrays.asList(
-            "sign_default", "encrypt_default", "encrypt_auto",
+            "sign_default", "encrypt_default", "encrypt_auto", "encrypt_reply",
             "auto_verify", "auto_decrypt", "auto_undecrypt",
             "openpgp_provider", "autocrypt", "autocrypt_mutual", "encrypt_subject",
             "sign_algo_smime", "encrypt_algo_smime", "check_certificate"
@@ -141,6 +142,7 @@ public class FragmentOptionsEncryption extends FragmentBase
         swSign = view.findViewById(R.id.swSign);
         swEncrypt = view.findViewById(R.id.swEncrypt);
         swEncryptAuto = view.findViewById(R.id.swEncryptAuto);
+        swEncryptReply = view.findViewById(R.id.swEncryptReply);
         swAutoVerify = view.findViewById(R.id.swAutoVerify);
         swAutoDecrypt = view.findViewById(R.id.swAutoDecrypt);
         swAutoUndoDecrypt = view.findViewById(R.id.swAutoUndoDecrypt);
@@ -228,6 +230,13 @@ public class FragmentOptionsEncryption extends FragmentBase
             }
         });
 
+        swEncryptReply.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("encrypt_reply", checked).apply();
+            }
+        });
+
         swAutoVerify.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@@ -664,6 +673,7 @@ public class FragmentOptionsEncryption extends FragmentBase
             swEncrypt.setChecked(prefs.getBoolean("encrypt_default", false));
             swSign.setEnabled(!swEncrypt.isChecked());
             swEncryptAuto.setChecked(prefs.getBoolean("encrypt_auto", false));
+            swEncryptReply.setChecked(prefs.getBoolean("encrypt_reply", false));
             swAutoVerify.setChecked(prefs.getBoolean("auto_verify", false));
             swAutoDecrypt.setChecked(prefs.getBoolean("auto_decrypt", false));
             swAutoUndoDecrypt.setChecked(prefs.getBoolean("auto_undecrypt", false));

app/src/main/res/layout/fragment_options_encryption.xml

@@ -130,6 +130,17 @@
                     app:layout_constraintTop_toBottomOf="@id/swEncrypt"
                     app:switchPadding="12dp" />
 
+                <androidx.appcompat.widget.SwitchCompat
+                    android:id="@+id/swEncryptReply"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="12dp"
+                    android:text="@string/title_advanced_encrypt_reply"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@id/swEncryptAuto"
+                    app:switchPadding="12dp" />
+
                 <androidx.appcompat.widget.SwitchCompat
                     android:id="@+id/swAutoVerify"
                     android:layout_width="0dp"
@@ -138,7 +149,7 @@
                     android:text="@string/title_advanced_auto_verify"
                     app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@id/swEncryptAuto"
+                    app:layout_constraintTop_toBottomOf="@id/swEncryptReply"
                     app:switchPadding="12dp" />
 
                 <androidx.appcompat.widget.SwitchCompat

app/src/main/res/values/strings.xml

@@ -839,6 +839,7 @@
     <string name="title_advanced_sign_default">Sign by default</string>
     <string name="title_advanced_encrypt_default">Encrypt by default</string>
     <string name="title_advanced_encrypt_auto">Automatically encrypt when all recipients\' keys are available</string>
+    <string name="title_advanced_encrypt_reply">Automatically encrypt when replying to an encrypted message</string>
     <string name="title_advanced_auto_verify">Automatically verify signed messages</string>
     <string name="title_advanced_auto_decrypt">Automatically decrypt messages</string>
     <string name="title_advanced_auto_undo_decrypt">Undo decryption on closing conversation</string>