add set_chat_protection() api

deltachat-ffi/deltachat.h

@@ -1170,6 +1170,24 @@ dc_array_t*     dc_get_chat_media            (dc_context_t* context, uint32_t ch
 uint32_t        dc_get_next_media            (dc_context_t* context, uint32_t msg_id, int dir, int msg_type, int msg_type2, int msg_type3);
 
 
+/**
+ * Enable or disable protection against active attacks.
+ * To enable protection, it is needed that all members are verified;
+ * if this condition is met, end-to-end-encryption is always enabled
+ * and only the verified keys are used.
+ *
+ * Sends out #DC_EVENT_CHAT_MODIFIED on changes
+ * and #DC_EVENT_MSGS_CHANGED if a status message was sent.
+ *
+ * @memberof dc_context_t
+ * @param context The context object as returned from dc_context_new().
+ * @param chat_id The ID of the chat to change the protection for.
+ * @param protect 1=protect chat, 0=unprotect chat
+ * @return 1=success, 0=error, eg. some members may be unverified
+ */
+int             dc_set_chat_protection       (dc_context_t* context, uint32_t chat_id, int protect);
+
+
 /**
  * Set chat visibility to pinned, archived or normal.
  *

deltachat-ffi/src/lib.rs

@@ -1057,6 +1057,35 @@ pub unsafe extern "C" fn dc_get_next_media(
     })
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn dc_set_chat_protection(
+    context: *mut dc_context_t,
+    chat_id: u32,
+    protect: libc::c_int,
+) -> libc::c_int {
+    if context.is_null() {
+        eprintln!("ignoring careless call to dc_set_chat_protection()");
+        return 0;
+    }
+    let ctx = &*context;
+    let protect = if let Some(s) = contact::ProtectionStatus::from_i32(protect) {
+        s
+    } else {
+        eprintln!("bad protect-value for dc_set_chat_protection()");
+        return 0;
+    };
+
+    block_on(async move {
+        match ChatId::new(chat_id).set_protection(&ctx, protect).await {
+            Ok(()) => 1,
+            Err(err) => {
+                error!(ctx, "Cannot protect chat. Are all members verified?");
+                0
+            }
+        }
+    })
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn dc_set_chat_visibility(
     context: *mut dc_context_t,