add/send info-message on protection changes

deltachat-ffi/deltachat.h

@@ -3460,7 +3460,8 @@ int             dc_msg_is_forwarded           (const dc_msg_t* msg);
 /**
  * Check if the message is an informational message, created by the
  * device or by another users. Such messages are not "typed" by the user but
- * created due to other actions, eg. dc_set_chat_name(), dc_set_chat_profile_image()
+ * created due to other actions,
+ * eg. dc_set_chat_name(), dc_set_chat_profile_image(), dc_set_chat_protection()
  * or dc_add_contact_to_chat().
  *
  * These messages are typically shown in the center of the chat view,
@@ -4973,8 +4974,10 @@ void dc_event_unref(dc_event_t* event);
 #define DC_STR_BAD_TIME_MSG_BODY          85
 #define DC_STR_UPDATE_REMINDER_MSG_BODY   86
 #define DC_STR_ERROR_NO_NETWORK           87
+#define DC_STR_PROTECTION_ENABLED         88
+#define DC_STR_PROTECTION_DISABLED        89
 
-#define DC_STR_COUNT                      87
+#define DC_STR_COUNT                      89
 
 /*
  * @}

src/chat.rs

@@ -221,7 +221,33 @@ impl ChatId {
 
         context.emit_event(EventType::ChatModified(self));
 
-        if send_to_others {}
+        // make sure, the receivers will get all keys
+        reset_gossiped_timestamp(context, self).await?;
+
+        // add info message
+        let msg_text = context
+            .stock_system_msg(
+                match protect {
+                    ProtectionStatus::Protected => StockMessage::ProtectionEnabled,
+                    ProtectionStatus::Unprotected => StockMessage::ProtectionDisabled,
+                },
+                "",
+                "",
+                DC_CONTACT_ID_SELF as u32,
+            )
+            .await;
+        if send_to_others {
+            let mut msg = Message::default();
+            msg.viewtype = Viewtype::Text;
+            msg.text = Some(msg_text);
+            msg.param.set_cmd(match protect {
+                ProtectionStatus::Protected => SystemMessage::ChatProtectionEnabled,
+                ProtectionStatus::Unprotected => SystemMessage::ChatProtectionDisabled,
+            });
+            send_msg(context, self, &mut msg).await?;
+        } else {
+            add_info_msg(context, self, msg_text).await;
+        }
 
         Ok(())
     }

src/mimefactory.rs

@@ -846,6 +846,18 @@ impl<'a, 'b> MimeFactory<'a, 'b> {
                     };
                 }
             }
+            SystemMessage::ChatProtectionEnabled => {
+                protected_headers.push(Header::new(
+                    "Chat-Content".to_string(),
+                    "protection-enabled".to_string(),
+                ));
+            }
+            SystemMessage::ChatProtectionDisabled => {
+                protected_headers.push(Header::new(
+                    "Chat-Content".to_string(),
+                    "protection-disabled".to_string(),
+                ));
+            }
             _ => {}
         }
 

src/mimeparser.rs

@@ -86,6 +86,10 @@ pub enum SystemMessage {
 
     /// Chat ephemeral message timer is changed.
     EphemeralTimerChanged = 10,
+
+    // Chat protection state changed
+    ChatProtectionEnabled = 11,
+    ChatProtectionDisabled = 12,
 }
 
 impl Default for SystemMessage {

src/stock.rs

@@ -233,6 +233,12 @@ pub enum StockMessage {
         fallback = "Could not find your mail server.\n\nPlease check your internet connection."
     ))]
     ErrorNoNetwork = 87,
+
+    #[strum(props(fallback = "Chat protection enabled."))]
+    ProtectionEnabled = 88,
+
+    #[strum(props(fallback = "Chat protection disabled."))]
+    ProtectionDisabled = 89,
 }
 
 /*