fix: Limit link chars to letters and numbers

db.py

@@ -52,6 +52,7 @@ def get_link_count():
     cursor = connection.cursor()
     cursor.execute("SELECT COUNT(*) FROM links")
     result = cursor.fetchone()
+    cursor.fetchall()
     cursor.close()
     connection.close()
 
@@ -70,6 +71,7 @@ def get_account_count():
     cursor = connection.cursor()
     cursor.execute("SELECT * FROM links")
     result = cursor.fetchone()
+    cursor.fetchall()
     cursor.close()
     connection.close()
     last_check_account = time.time()

main.py

@@ -114,6 +114,10 @@ def add_link():
     if len(link) < 5:
         return error('Link too short')
     
+    regexmatch = re.match(r"^[a-zA-Z0-9]+$", link)
+    if not regexmatch:
+        return error('Invalid link')
+    
     # Verify link is not taken
     if db.get_link(link) != False:
         return error('Link already taken')