add: login feature

Database.py

@@ -59,9 +59,6 @@ class Database:
             self._create_table("users", data)
 
     def add_user(self, user: User):
-        self.cursor.execute(f"SELECT * FROM `users` WHERE `email` = '{user.email}'")
-        if (len(self.cursor.fetchall())):
-            return ("Email already used")
         if (len(user.password) < 8):
             return ("Password too short (minimum 8 chars)")
         if (len(user.first_name) == 0):
@@ -70,6 +67,17 @@ class Database:
             return ("Last name empty")
         if (len(user.username) == 0):
             return ("Username empty")
+        self.cursor.execute(f"SELECT * FROM `users` WHERE `email` = '{user.email}'")
+        if (len(self.cursor.fetchall())):
+            return ("Email already used")
         self.cursor.execute(user.to_insert_sql()) 
         self.mydb.commit()
 
+    def account_test(self, email: str, password: str):
+        self.cursor.execute(f"SELECT * FROM `users` WHERE `email` = '{email}'")
+        result = self.cursor.fetchall()
+        if (len(result) == 0):
+            return (1);
+        if (result[0][-1] != password):
+            return (1);
+        return (0);

login.py

@@ -1,12 +1,14 @@
 import flask
+import database
 
 page = flask.Blueprint("login", __name__, template_folder="templates")
 
 @page.route("/login", methods=['POST', 'GET'])
 def show():
-    if (flask.request.method == ['GET']):
+    if (flask.request.method == 'GET'):
         return (flask.render_template("login/login.html"))
-    else:
+    email = flask.request.form['email']
-        return ("bozo")
+    password = flask.request.form['password']
-        email = flask.request.form['email']
+    if (database.database.account_test(email, password)):
-        password = flask.request.form['password']
+        return (flask.render_template("login/login.html", error = "Invalid credentials"))
+    return (flask.redirect("/panel"))

panel.py

@@ -1,7 +0,0 @@
-import flask
-
-page = flask.Blueprint("panel", __name__, template_folder="templates")
-
-@page.route("/")
-def show():
-    return (flask.render_template("panel/panel.html"))