added download button to slides with pdfs

app/routes.py

@@ -102,6 +102,9 @@ def index():
     if not token:
         return redirect(url_for("main.set_token")) 
     else:
+        for deck in get_unlocked_decks(token):
+            print(str(deck) + " | " + str(deck.export_file))
+
         return render_template('index.html', active_banner=get_active_banner(), decks=get_unlocked_decks(token), user_name=token.name, active_course_name=token.active_course.name, courses=get_all_courses())
 
 def set_cookie(token):
@@ -308,6 +311,28 @@ def serve_deck(deck, course_folder, path='index.html'):
 
     abort(404)
 
+
+@main.route('/exports/<course_folder>/<deck>/<path>')
+def serve_export(deck, course_folder, path):
+    course = db.session.execute(db.select(Course).where(Course.folder==course_folder)).scalar()
+    if not course:
+        abort(404)
+    assert isinstance(course, Course)
+    deck = db.session.execute(db.select(Deck).where(Deck.deck==deck and Deck.course_id == course.id)).scalar()
+    if not deck:
+        abort(404)
+    assert isinstance(deck, Deck)
+
+    if not is_deck_unlocked(deck.deck):
+        return redirect(url_for('main.index'))
+    exports_dir = os.path.join(current_app.config['EXPORTS_DIR'], course.folder)
+    deck_path = os.path.join(exports_dir, deck.deck)
+    requested_file = os.path.join(deck_path, path)
+    if os.path.isfile(requested_file):
+        return send_from_directory(deck_path, path)
+    abort(404)
+
+
 @main.route('/admin', methods=['GET', 'POST'])
 @flask_login.login_required
 def admin():