add subscribing and unsubscribing, add post editing

app/util.py

@@ -1,6 +1,7 @@
-from flask import url_for, session
+from flask import url_for, session, request
 from .models import Posts, Threads
 from .auth import is_logged_in
+import time
 
 def get_post_url(post_id, _anchor=False, external=False):
     post = Posts.find({'id': post_id})
@@ -24,3 +25,9 @@ def get_csrf_token():
 
 def csrf_input():
     return f'<input type="hidden" name="csrf" value="{get_csrf_token()}">'
+
+def get_form_checkbox(name: str) -> bool:
+    return request.form.get(name, None) == 'on'
+
+def time_now() -> int:
+    return int(time.time())