add mentions

form/comment.js

@@ -14,6 +14,9 @@ let main = new Route([auth], async function (req, res, input) {
     if (!targetType || !targetId || !content || username == '!nobody')
         return { 'success': false, 'message': 'Some fields are missing' }; // probably should not re-use these strings
 
+    if (content.length > 8192)
+        return { 'success': false, 'message': 'Comment is too long' };
+
     await db.run('INSERT INTO comment (username, targetType, targetId, date, content, id) VALUES (?,?,?,?,?,?)', [
         username,
         targetType,
@@ -25,6 +28,23 @@ let main = new Route([auth], async function (req, res, input) {
 
     let u = `/client/${targetType}?id=${targetId}`;
 
+    let a = content.split(' ');
+
+    for (let b of a) {
+        if (b.startsWith('@')) {
+            let f = b.slice(1);
+
+            await db.run('INSERT INTO message (username, targetType, targetId, date, content, read) VALUES (?,?,?,?,?,?)', [
+                f,
+                'mention',
+                u,
+                +new Date(),
+                content,
+                'false'
+            ]);
+        }
+    }
+
     if (targetType == 'user') {
         await db.run('INSERT INTO message (username, targetType, targetId, date, content, read) VALUES (?,?,?,?,?,?)', [
             targetId,