add: added channel purge button

back/api/channels.js

@@ -1,5 +1,20 @@
 const express = require('express');
-const { getConnection, getChannels, getChannel, addChannel, getMessages, getMessage, addMessage, deleteMessage, addMention, getMentions, getUserByUsername, deleMentions } = require('../libs/mysql');
+const {
+    getConnection,
+    getChannels,
+    getChannel,
+    addChannel,
+    getMessages,
+    getMessage,
+    addMessage,
+    deleteMessage,
+    addMention,
+    getMentions,
+    getUserByUsername,
+    deleMentions,
+    deleteChannelMentions,
+    deleteChannelMessages
+} = require('../libs/mysql');
 const { checkAuth } = require('../libs/middlewares');
 
 const router = express.Router();
@@ -23,6 +38,36 @@ router.get('/:name', async (req, res) => {
     }
 });
 
+router.use('/:name/purge', checkAuth);
+router.post('/:name/purge', async (req, res) => {
+    const name = req.params.name;
+    const user = req.user;
+
+    const connection = await getConnection();
+
+    const channel = await getChannel(connection, name);
+    if (!channel[0]) {
+        connection.end();
+        return res.status(400).send({ error: 'No channel found' });
+    }
+
+    if (user.admin !== 1) {
+        connection.end();
+        return res.status(401).send({ error: 'Unauthorized' });
+    }
+
+    await deleteChannelMentions(connection, channel[0].id);
+    await deleteChannelMessages(connection, channel[0].id);
+    connection.end();
+
+    req.sockets.emit({
+        type: 'purge_channel',
+        channel_id: channel[0].id,
+    });
+
+    res.send({ message: 'Channel purged' });
+});
+
 router.get('/:name/messages', async (req, res) => {
     const name = req.params.name;
     const connection = await getConnection();