read manifest.toml and add get_webxdc_info()

deltachat-ffi/deltachat.h

@@ -3689,6 +3689,27 @@ char*           dc_msg_get_filemime           (const dc_msg_t* msg);
 char*             dc_msg_get_webxdc_blob      (const dc_msg_t* msg, const char* filename, size_t* ret_bytes);
 
 
+/**
+ * Get info a webxdc message, in JSON format.
+ * The returned JSON string has the following key/values:
+ *
+ * - name: The name of the app.
+ *   Defaults to the filename if not set in the manifest.
+ * - icon: App icon file name.
+ *   Defaults to an standard icon if nothing is set in the manifest.
+ *   To get the file, use dc_msg_get_webxdc_blob().
+ *   App icons should should be square,
+ *   the implementations will add round corners etc. as needed.
+ *
+ * @memberof dc_msg_t
+ * @param msg The webxdc instance.
+ * @return a UTF8-encoded JSON string containing all requested info.
+ *     Must be freed using dc_str_unref().
+ *     NULL is never returned.
+ */
+char*             dc_msg_get_webxdc_info      (const dc_msg_t* msg);
+
+
 /**
  * Get the size of the file.  Returns the size of the file associated with a
  * message, if applicable.

deltachat-ffi/src/lib.rs

@@ -3090,7 +3090,6 @@ pub unsafe extern "C" fn dc_msg_get_webxdc_blob(
     });
     match blob {
         Ok(blob) => {
-            // TODO: introduce dc_blob_t to avoid malloc and returning size by pointer and to save copying data
             *ret_bytes = blob.len();
             let ptr = libc::malloc(*ret_bytes);
             libc::memcpy(ptr, blob.as_ptr() as *mut libc::c_void, *ret_bytes);
@@ -3103,6 +3102,29 @@ pub unsafe extern "C" fn dc_msg_get_webxdc_blob(
     }
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn dc_msg_get_webxdc_info(msg: *mut dc_msg_t) -> *mut libc::c_char {
+    if msg.is_null() {
+        eprintln!("ignoring careless call to dc_msg_get_webxdc_info()");
+        return "".strdup();
+    }
+    let ffi_msg = &*msg;
+    let ctx = &*ffi_msg.context;
+
+    block_on(async move {
+        let info = match ffi_msg.message.get_webxdc_info(ctx).await {
+            Ok(info) => info,
+            Err(err) => {
+                error!(ctx, "dc_msg_get_webxdc_info() failed to get info: {}", err);
+                return "".strdup();
+            }
+        };
+        serde_json::to_string(&info)
+            .unwrap_or_log_default(ctx, "dc_msg_get_webxdc_info() failed to serialise to json")
+            .strdup()
+    })
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn dc_msg_get_filemime(msg: *mut dc_msg_t) -> *mut libc::c_char {
     if msg.is_null() {