moderation: add self-action prevention

* The problem is that an admin could block his own
  account. With this change it is possible to prevent
  the admin from doing that.
* Implement prevent_self_action decorator
* Prevent self-block, deactivate, impersonate
* Update tests for self-action prevention
* closes <inveniosoftware/invenio-administration#203>

invenio_users_resources/decorators.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2024 CERN.
+# Copyright (C) 2024 KTH Royal Institute of Technology
+#
+# Invenio-Users-Resources is free software; you can redistribute it and/or
+# modify it under the terms of the MIT License; see LICENSE file for more
+# details.
+
+"""Users decorators."""
+from functools import wraps
+
+from flask import g
+from flask_resources import resource_requestctx
+from invenio_records_resources.resources.errors import PermissionDeniedError
+
+
+def prevent_self_action():
+    """Decorator that prevents users from taking actions on their own account."""
+
+    def decorator(func):
+        @wraps(func)
+        def wrapper(*args, **kwargs):
+            user_id = str(resource_requestctx.view_args["id"])
+            current_user_id = str(g.identity.id)
+
+            if user_id == current_user_id:
+                raise PermissionDeniedError()
+
+            return func(*args, **kwargs)
+
+        return wrapper
+
+    return decorator

invenio_users_resources/resources/users/resource.py

@@ -3,6 +3,7 @@
 # Copyright (C) 2022 TU Wien.
 # Copyright (C) 2022 CERN.
 # Copyright (C) 2022 European Union.
+# Copyright (C) 2024 KTH Royal Institute of Technology
 #
 # Invenio-Users-Resources is free software; you can redistribute it and/or
 # modify it under the terms of the MIT License; see LICENSE file for more
@@ -20,6 +21,8 @@
 )
 from invenio_records_resources.resources.records.utils import search_preference
 
+from invenio_users_resources.decorators import prevent_self_action
+
 
 #
 # Resource
@@ -108,6 +111,7 @@ def approve(self):
         return "", 200
 
     @request_view_args
+    @prevent_self_action()
     def block(self):
         """Block user."""
         self.service.block(
@@ -126,6 +130,7 @@ def restore(self):
         return "", 200
 
     @request_view_args
+    @prevent_self_action()
     def deactivate(self):
         """Deactive user."""
         self.service.deactivate(
@@ -144,6 +149,7 @@ def activate(self):
         return "", 200
 
     @request_view_args
+    @prevent_self_action()
     def impersonate(self):
         """Impersonate the user."""
         user = self.service.can_impersonate(

tests/resources/test_resources_users.py

@@ -2,6 +2,7 @@
 #
 # Copyright (C) 2022 European Union.
 # Copyright (C) 2022 CERN.
+# Copyright (C) 2024 KTH Royal Institute of Technology
 #
 # Invenio-Users-Resources is free software; you can redistribute it and/or
 # modify it under the terms of the MIT License; see LICENSE file for more
@@ -137,6 +138,13 @@ def test_block_user(client, headers, user_pub, user_moderator, db):
     assert res.status_code == 200
     assert res.json["blocked_at"] is not None
 
+    # Test user tries to block themselves
+    res = client.post(f"/users/{user_moderator.id}/block", headers=headers)
+    assert res.status_code == 403
+
+    res = client.get(f"/users/{user_moderator.id}")
+    assert res.status_code == 200
+
 
 def test_deactivate_user(client, headers, user_pub, user_moderator, db):
     """Tests deactivate user endpoint."""
@@ -148,6 +156,13 @@ def test_deactivate_user(client, headers, user_pub, user_moderator, db):
     assert res.status_code == 200
     assert res.json["active"] == False
 
+    # Test user tries to deactivate themselves
+    res = client.post(f"/users/{user_moderator.id}/deactivate", headers=headers)
+    assert res.status_code == 403
+
+    res = client.get(f"/users/{user_moderator.id}")
+    assert res.status_code == 200
+
 
 def test_management_permissions(client, headers, user_pub, db):
     """Test permissions at the resource level."""