added basic functionality

app/routes.py

@@ -30,14 +30,29 @@ from .utils import (
     get_token,
     get_unlocked_decks,
     is_deck_unlocked,
+    retrieve_token,
     serialize_token,
     update_token,
 )
 
+
 main = Blueprint('main', __name__)
 slidev_deck_pattern = re.compile(r"^\/slides\/[^\/]+\/\d*(?:\?.*)?$")
 slidev_all_pattern = re.compile(r"^\/slides\/[^\/]+(?:\/presenter)?\/\d+(?:\?.*)?$")
 
+
+@main.before_request
+def ensure_cookie():
+    token = get_token()
+    if token:
+        return
+    else:
+       token = generate_token()
+
+    resp = make_response(redirect(request.url)) 
+    resp.set_cookie('access_token', serialize_token(token), httponly=True)
+    return resp
+
 @main.after_request
 def inject_confused_button(response):
     if True:
@@ -81,15 +96,15 @@ def inject_confused_button(response):
                 response.set_data(body)
     return response
 
-    
+
 @main.route('/')
 def index():
     token = get_token()
     if not token:
-        token = generate_token()
+        abort(500)
-    resp = make_response(render_template('index.html', active_banner=get_active_banner(), decks=get_unlocked_decks(token), user_name=token.name))
+    else:
-    resp.set_cookie('access_token', serialize_token(token), httponly=True)
+        return render_template('index.html', active_banner=get_active_banner(), decks=get_unlocked_decks(token), user_name=token.name)
-    return resp
+
 
 @main.route('/login', methods=['POST', 'GET'])
 def login():
@@ -127,12 +142,34 @@ def access():
         return redirect('/')
     return render_template('index.html', error="Invalid password.", decks=get_unlocked_decks(token))
 
-@main.route('/confused', methods=['POST'])
 
+@main.route('/access/<access_code>', methods=['GET'])
+def access_link(access_code: str):
+    password = db.session.execute(db.select(Password).where(Password.value == access_code)).scalar()
+    assert isinstance(password, Password|None)
+    token = get_token()
+    if password is not None and not password.is_expired():
+        update_token(password.decks)
+        return redirect('/')
+    return render_template('index.html', error="Invalid password.", decks=get_unlocked_decks(token))
+
+
+
+@main.route('/confused', methods=['POST'])
 def confused():
     resp = jsonify(success=True)
     return resp 
 
+@main.route('/retrieve-token', methods=['POST'])
+def set_username_token():
+    new_username : str = request.form.get("user_name", "").strip()
+    resp = make_response(redirect('/'))
+    if new_username:
+        token = retrieve_token(new_username)
+        if token:
+            resp.set_cookie('access_token', serialize_token(token), httponly=True)
+    return resp 
+
 
 @main.route('/slides/<deck>/')
 @main.route('/slides/<deck>/<path:path>')

app/templates/index.html

@@ -36,7 +36,32 @@
   <!-- Header -->
   <header class="bg-surface border-b border-border shadow-sm">
     <div class="max-w-7xl mx-auto px-6 py-4 flex items-center justify-between">
-      <div class="text-sm text-muted font-medium">{{ user_name }}</div>
+      <!-- Editable Username Form -->
+      <form method="POST" action="/retrieve-token" class="flex items-center space-x-2">
+        <input
+          type="text"
+          name="user_name"
+          value="{{ user_name }}"
+          class="bg-transparent text-muted text-sm font-medium px-2 py-1 rounded-md border border-transparent focus:border-primary focus:outline-none focus:bg-background"
+          readonly
+          id="usernameInput"
+        />
+        <button
+          type="button"
+          onclick="enableUsernameEdit()"
+          class="text-sm text-primary hover:underline"
+          id="editBtn"
+        >
+          Edit
+        </button>
+        <button
+          type="submit"
+          class="hidden text-sm text-white bg-primary px-3 py-1 rounded-md hover:bg-blue-700"
+          id="saveBtn"
+        >
+          Save
+        </button>
+      </form>
       <div class="text-lg font-semibold">GRNVS Tutorium</div>
       <a href="/admin">
         <button class="bg-primary hover:bg-blue-700 text-white px-4 py-2 rounded-md transition">
@@ -104,5 +129,19 @@
   </main>
 
   <script src="https://cdn.jsdelivr.net/npm/flowbite@3.1.2/dist/flowbite.min.js"></script>
+  <script>
+    function enableUsernameEdit() {
+      const input = document.getElementById('usernameInput');
+      const editBtn = document.getElementById('editBtn');
+      const saveBtn = document.getElementById('saveBtn');
+
+      input.removeAttribute('readonly');
+      input.classList.add('border-border');
+      input.focus();
+
+      editBtn.classList.add('hidden');
+      saveBtn.classList.remove('hidden');
+    }
+  </script>
 </body>
 </html>

app/utils.py

@@ -1,6 +1,6 @@
 import os
 
-from flask import Flask, request
+from flask import Flask, request, session
 from typing import cast
 from itsdangerous import BadSignature, URLSafeSerializer
 from xkcdpass import xkcd_password
@@ -28,6 +28,7 @@ def get_available_decks(app: Flask):
 def generate_username() -> str:
     return cast(str, xkcd_password.generate_xkcdpassword(wordlist=words, numwords=3, delimiter="-"))
 
+
 def generate_password() -> str:
     return cast(str, xkcd_password.generate_xkcdpassword(wordlist=words, numwords=5, delimiter="-"))
 
@@ -60,6 +61,10 @@ def get_token() -> (Token | None):
     except BadSignature:
         return None
 
+def retrieve_token(username : str):
+    return db.session.execute(db.select(Token).filter_by(name=username)).scalar_one_or_none()
+
+
 def get_unlocked_decks(token: (Token|None)):
     if token is None:
         return []