Add set_queuefile_extension method, endpoint, and ui.

frontends/ycdl_flask/backend/endpoints/channel_endpoints.py

@@ -134,3 +134,12 @@ def post_set_automark(channel_id):
         flask.abort(400)
 
     return jsonify.make_json_response({})
+
+@site.route('/channel/<channel_id>/set_queuefile_extension', methods=['POST'])
+def post_set_queuefile_extension(channel_id):
+    extension = request.form['extension']
+    channel = common.ycdldb.get_channel(channel_id)
+
+    channel.set_queuefile_extension(extension)
+
+    return jsonify.make_json_response({})

frontends/ycdl_flask/static/js/api.js

@@ -47,6 +47,15 @@ function set_automark(channel_id, state, callback)
     return common.post(url, data, callback);
 }
 
+api.channels.set_queuefile_extension =
+function set_queuefile_extension(channel_id, extension, callback)
+{
+    const url = `/channel/${channel_id}/set_queuefile_extension`;
+    const data = new FormData();
+    data.append("extension", extension);
+    return common.post(url, data, callback);
+}
+
 api.channels.callback_go_to_channels =
 function callback_go_to_channels(response)
 {

frontends/ycdl_flask/templates/channel.html

@@ -265,6 +265,11 @@ https://stackoverflow.com/a/35153397
         <span id="set_automark_spinner" class="hidden">Working...</span>
     </div>
 
+    <div>
+        <input type="text" id="set_queuefile_extension_input" placeholder="Queuefile extension" value="{{channel.queuefile_extension or ''}}"/>
+        <button id="set_queuefile_extension_button" class="button_with_spinner" onclick="return set_queuefile_extension_form();">Set extension</button>
+    </div>
+
     <button class="red_button button_with_confirm"
     data-prompt="Delete channel and all videos?"
     data-onclick="return delete_channel_form();"
@@ -540,5 +545,22 @@ function set_automark_callback(response)
         set_automark_spinner.hide();
     }
 }
+
+set_queuefile_extension_input = document.getElementById("set_queuefile_extension_input");
+set_queuefile_extension_button = document.getElementById("set_queuefile_extension_button");
+common.bind_box_to_button(set_queuefile_extension_input, set_queuefile_extension_button);
+function set_queuefile_extension_form(event)
+{
+    const extension = set_queuefile_extension_input.value.trim();
+    api.channels.set_queuefile_extension(CHANNEL_ID, extension, set_queuefile_extension_callback);
+}
+
+function set_queuefile_extension_callback(response)
+{
+    if (response.meta.status == 200)
+    {
+        window[set_queuefile_extension_button.dataset.spinnerCloser]();
+    }
+}
 </script>
 </html>

ycdl/objects.py

@@ -80,6 +80,23 @@ class Channel(Base):
         if commit:
             self.ycdldb.commit()
 
+    def set_queuefile_extension(self, extension, commit=True):
+        if not extension:
+            extension = None
+
+        if extension is not None:
+            extension = extension.strip()
+
+        pairs = {
+            'id': self.id,
+            'queuefile_extension': extension,
+        }
+        self.ycdldb.sql_update(table='channels', pairs=pairs, where_key='id')
+        self.queuefile_extension = extension
+
+        if commit:
+            self.ycdldb.commit()
+
     def set_uploads_playlist_id(self, playlist_id, commit=True):
         if not isinstance(playlist_id, str):
             raise TypeError(f'Playlist id must be a string, not {type(playlist_id)}.')