disallow creation of any Classifier with Private at top level

tests/unit/admin/views/test_classifiers.py

@@ -12,6 +12,7 @@
 
 import pretend
 import pytest
+import sqlalchemy
 
 from warehouse.admin.views import classifiers as views
 from warehouse.classifiers.models import Classifier
@@ -80,6 +81,44 @@ def test_add_parent_classifier(self, db_request):
         assert new.l4 == 0
         assert new.l5 == 0
 
+    @pytest.mark.parametrize(
+        "parent_classifier, parent_levels, expected_levels",
+        [
+            ("private", (2, 0, 0, 0), (2, None, 0, 0)),
+            ("private", (2, 3, 0, 0), (2, 3, None, 0)),
+            ("private", (2, 3, 4, 0), (2, 3, 4, None)),
+            ("Private", (2, 0, 0, 0), (2, None, 0, 0)),
+            ("Private", (2, 3, 0, 0), (2, 3, None, 0)),
+            ("Private", (2, 3, 4, 0), (2, 3, 4, None)),
+            ("PrIvAtE", (2, 0, 0, 0), (2, None, 0, 0)),
+            ("PrIvAtE", (2, 3, 0, 0), (2, 3, None, 0)),
+            ("PrIvAtE", (2, 3, 4, 0), (2, 3, 4, None)),
+        ],
+    )
+    def test_add_private_child_classifier(
+        self, db_request, parent_classifier, parent_levels, expected_levels
+    ):
+        l2, l3, l4, l5 = parent_levels
+        parent = ClassifierFactory(
+            l2=l2, l3=l3, l4=l4, l5=l5, classifier=parent_classifier
+        )
+
+        db_request.params = {"parent_id": parent.id, "child": "Foobar"}
+        db_request.session.flash = pretend.call_recorder(lambda *a, **kw: None)
+        db_request.route_path = lambda *a: "/the/path"
+
+        with pytest.raises(sqlalchemy.exc.IntegrityError):
+            views.AddClassifier(db_request).add_child_classifier()
+
+    @pytest.mark.parametrize("parent_classifier", ["private", "Private", "PrIvAtE"])
+    def test_add_private_parent_classifier(self, db_request, parent_classifier):
+        db_request.params = {"parent": f"{parent_classifier} :: Do Not Upload"}
+        db_request.session.flash = pretend.call_recorder(lambda *a, **kw: None)
+        db_request.route_path = lambda *a: "/the/path"
+
+        with pytest.raises(sqlalchemy.exc.IntegrityError):
+            views.AddClassifier(db_request).add_parent_classifier()
+
 
 class TestDeprecateClassifier:
     def test_deprecate_classifier(self, db_request):

warehouse/classifiers/models.py

@@ -10,7 +10,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from sqlalchemy import Boolean, Column, Integer, Text, sql
+from sqlalchemy import Boolean, CheckConstraint, Column, Integer, Text, sql
 
 from warehouse import db
 from warehouse.utils.attrs import make_repr
@@ -19,6 +19,10 @@
 class Classifier(db.ModelBase):
 
     __tablename__ = "trove_classifiers"
+    __tableargs__ = CheckConstraint(
+        "classifier not ilike 'private ::%'",
+        name="ck_disallow_private_top_level_classifier",
+    )
 
     __repr__ = make_repr("classifier")
 

warehouse/migrations/versions/c4a1ee483bb3_do_not_allow_private_trove_classifiers.py

@@ -0,0 +1,35 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+Do not allow Private trove classifiers
+
+Revision ID: c4a1ee483bb3
+Revises: 3db69c05dd11
+Create Date: 2019-02-17 20:01:54.314170
+"""
+
+from alembic import op
+
+revision = "c4a1ee483bb3"
+down_revision = "3db69c05dd11"
+
+
+def upgrade():
+    op.create_check_constraint(
+        "ck_disallow_private_top_level_classifier",
+        "trove_classifiers",
+        "classifier not ilike 'private ::%'",
+    )
+
+
+def downgrade():
+    op.drop_constraint("ck_disallow_private_top_level_classifier")