implement channels fully, implement servers fully, make dms impossible

to send if no longer friends, update overview information on
invalidation (form response recieved, friends update)

src/routes/api/updates/[sessionId]/+server.ts

@@ -1,7 +1,7 @@
 import { json } from '@sveltejs/kit';
 import type { RequestHandler } from './$types';
 import { _clients } from '../+server';
-import { DirectMessageID } from '$lib';
+import { ChannelID, DirectMessageID, UserID } from '$lib';
 import { db } from '$lib/server/db';
 import * as table from '$lib/server/db/schema';
 import { or } from 'drizzle-orm';
@@ -33,7 +33,7 @@ export const POST: RequestHandler = async ({ params, request, locals }) => {
     return json({ error: 'Invalid subscribeTo value' }, { status: 400 });
   }
 
-  let isValidDmid = false;
+  let isValid = false;
 
   if (DirectMessageID.is(subscribeTo)) {
     const find = await db
@@ -47,13 +47,35 @@ export const POST: RequestHandler = async ({ params, request, locals }) => {
       );
 
     if (find?.length != 0) {
-      isValidDmid = true;
+      isValid = true;
+    }
+  }
+
+  if (UserID.is(subscribeTo)) {
+    const find = await db
+      .select()
+      .from(table.user)
+      .where(or(eq(table.user.id, subscribeTo)));
+
+    if (find?.length != 0) {
+      isValid = true;
+    }
+  }
+
+  if (ChannelID.is(subscribeTo)) {
+    const find = await db
+      .select()
+      .from(table.channel)
+      .where(or(eq(table.channel.id, subscribeTo)));
+
+    if (find?.length != 0) {
+      isValid = true;
     }
   }
 
   if (
     !(
-      isValidDmid ||
+      isValid ||
       locals.user.groups.find((z) => z.id === subscribeTo) ||
       locals.user.servers.find((z) => z.id === subscribeTo)
     )