Implements #146: copy message button for moderators

We overload the copy message method that comes with Converse 11, to add
the message metadata (nick and full date).

conversejs/lib/plugins/livechat-specific/message-action.ts

@@ -0,0 +1,32 @@
+// SPDX-FileCopyrightText: 2024 John Livingston <https://www.john-livingston.fr/>
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+/**
+ * Do some customization on Message actions custom elements:
+ * * override the copy text method to add meta data
+ *
+ * @param plugin The plugin object
+ */
+export function customizeMessageAction (plugin: any): void {
+  const _converse = plugin._converse
+  const MessageActions = _converse.api.elements.registry['converse-message-actions']
+  if (MessageActions) {
+    class MessageActionsOverloaded extends MessageActions {
+      async onMessageCopyButtonClicked (ev?: Event): Promise<void> {
+        ev?.preventDefault?.()
+        let txt = ''
+        try {
+          txt += this.model.getDisplayName() as string
+          txt += ' - '
+          const date = new Date(this.model.get('edited') || this.model.get('time'))
+          txt += date.toLocaleDateString() + ' ' + date.toLocaleTimeString()
+          txt += '\n'
+        } catch {}
+        txt += this.model.getMessageText() as string
+        await navigator.clipboard.writeText(txt)
+      }
+    }
+    _converse.api.elements.define('converse-message-actions', MessageActionsOverloaded)
+  }
+}