Add fixed user validation

Fix the way a fixed user id is generated

server/service_repo/auth/fixed_user.py

@@ -5,27 +5,45 @@ from typing import Sequence, TypeVar
 import attr
 
 from config import config
+from config.info import get_default_company
 
 T = TypeVar("T", bound="FixedUser")
 
 
+class FixedUsersError(Exception):
+    pass
+
+
 @attr.s(auto_attribs=True)
 class FixedUser:
     username: str
     password: str
     name: str
+    company: str = get_default_company()
 
     def __attrs_post_init__(self):
-        self.user_id = hashlib.md5(f"{self.username}:{self.password}".encode()).hexdigest()
+        self.user_id = hashlib.md5(f"{self.company}:{self.username}".encode()).hexdigest()
 
     @classmethod
     def enabled(cls):
         return config.get("apiserver.auth.fixed_users.enabled", False)
 
+    @classmethod
+    def validate(cls):
+        if not cls.enabled():
+            return
+        users = cls.from_config()
+        if len({user.username for user in users}) < len(users):
+            raise FixedUsersError(
+                "Duplicate user names found in fixed users configuration"
+            )
+
     @classmethod
     @lru_cache()
     def from_config(cls) -> Sequence[T]:
-        return [cls(**user) for user in config.get("apiserver.auth.fixed_users.users", [])]
+        return [
+            cls(**user) for user in config.get("apiserver.auth.fixed_users.users", [])
+        ]
 
     @classmethod
     @lru_cache()