auth.py: Make usage of exceptions instead of if-else-blocks

.gitignore

@@ -1,2 +1 @@
 /.env
-*.pyc

Pipfile

@@ -14,7 +14,6 @@ pyyaml = "~=5.4.1"
 
 [dev-packages]
 flake8 = "~=3.9.2"
-yapf = "~=0.31.0"
 
 [requires]
 python_version = "3.8"

README.md

@@ -43,13 +43,6 @@ python -m unittest discover ki
 flake8
 ```
 
-### Formatierung
-
-Um ein einheitliches Quellcode-Erlebnis zu haben, kann der Code mit yapf neu formatiert werden:
-
-'''
-yapf -i --recursive ki/
-'''
 
 ### Testbenutzer
 

ki/auth.py

@@ -5,27 +5,40 @@ from app import app, db
 from ki.models import User, Token
 
 
+class UserWrongCredentialsException(Exception):
+    pass
+
+
+class UserAllreadyLoggedInException(Exception):
+    pass
+
+
 def auth(username, password):
     auth_file_path = app.config["KI_DATA_DIR"] + "/auth.yml"
 
     with open(auth_file_path, "r") as auth_file_stream:
+
+        try:
             users = yaml.safe_load(auth_file_stream)
 
-        if username not in users:
+        except yaml.YAMLError:
-            return None
+            print('Could not parse auth.yml.')
 
+        try:
             auth_user = users[username]
 
             if auth_user["password"] != password:
+                raise UserWrongCredentialsException
+
+        except (UserWrongCredentialsException, KeyError):
+            print('Wrong username/password combination')
             return None
 
+        else:
             user = User.query.filter(User.auth_id.__eq__(username)).first()
 
-        if user is None:
-            user = User(auth_id=username)
-            db.session.add(user)
-
             token = Token(token=str(uuid.uuid4()), user=user)
+
             db.session.add(token)
             db.session.commit()
 

ki/test/test_skills_endpoint.py

@@ -22,14 +22,13 @@ class TestSkillsEndpoint(unittest.TestCase):
         self.assertEqual(response.status_code, 200)
         self.assertEqual(
             {
-                "skills": [{
+                "skills": [
-                    "id": 1,
+                    {"id": 1, "name": "PHP"},
-                    "name": "PHP"
+                    {"id": 3, "name": "Python"}
-                }, {
+                ]
-                    "id": 3,
+            },
-                    "name": "Python"
+            response.json
-                }]
+        )
-            }, response.json)
 
 
 if __name__ == "main":