feat: add new endpoints to retrieve and delete users

app/routers/users.py

@@ -7,6 +7,7 @@
 import uuid
 
 import fastapi
+import fastapi.exceptions
 import pydantic
 
 from app import domain, services
@@ -49,6 +50,36 @@ async def users_list(
     return storage.all()
 
 
+@router.get("/{user_id}", tags=["users"])
+async def users_get(
+    storage: typing.Annotated[services.Storage, fastapi.Depends()], user_id: str
+):
+    """
+    Retrieve a user specified by its ID.
+    """
+    user = storage.retrieve(user_id)
+
+    if user is not None:
+        return user
+
+    raise fastapi.exceptions.HTTPException(status_code=404, detail="user not found")
+
+
+@router.delete("/{user_id}", tags=["users"])
+async def users_delete(
+    storage: typing.Annotated[services.Storage, fastapi.Depends()], user_id: str
+):
+    """
+    Retrieve a user specified by its ID.
+    """
+    user = storage.delete(user_id)
+
+    if user is not None:
+        return user
+
+    raise fastapi.exceptions.HTTPException(status_code=404, detail="user not found")
+
+
 @router.post("/", tags=["users"])
 async def users_new(
     storage: typing.Annotated[services.Storage, fastapi.Depends()],

app/services/store.py

@@ -36,6 +36,22 @@ def append(self, user: domain.User):
         if user.id not in self.storage:
             self.storage[user.id] = user
 
+    def retrieve(self, user_id: str) -> domain.User | None:
+        """
+        Retrieve the user by ID.
+        """
+        return self.storage.get(user_id, None)
+
+    def delete(self, user_id: str) -> domain.User | None:
+        """
+        Delete the user by ID.
+        """
+        user = self.storage.get(user_id, None)
+        if user is None:
+            return None
+        del self.storage[user_id]
+        return user
+
     def all(self) -> list[domain.User]:
         """
         Return all the registered users.