Merge branch 'revert-b0498c17' into 'master'

Refactor `DynamicPathValidator` and `GitLab::Regex` some more

See merge request !11693

10 files changed, 459 insertions, 453 deletions

diff --git a/spec/controllers/import/bitbucket_controller_spec.rb b/spec/controllers/import/bitbucket_controller_spec.rb
index 010e3180ea4..0be7bc6a045 100644
--- a/spec/controllers/import/bitbucket_controller_spec.rb
+++ b/spec/controllers/import/bitbucket_controller_spec.rb
@@ -133,9 +133,13 @@ describe Import::BitbucketController do
       end
 
       context "when a namespace with the Bitbucket user's username already exists" do
-        let!(:existing_namespace) { create(:namespace, name: other_username, owner: user) }
+        let!(:existing_namespace) { create(:group, name: other_username) }
 
         context "when the namespace is owned by the GitLab user" do
+          before do
+            existing_namespace.add_owner(user)
+          end
+
           it "takes the existing namespace" do
             expect(Gitlab::BitbucketImport::ProjectCreator).
               to receive(:new).with(bitbucket_repo, bitbucket_repo.name, existing_namespace, user, access_params).
@@ -146,11 +150,6 @@ describe Import::BitbucketController do
         end
 
         context "when the namespace is not owned by the GitLab user" do
-          before do
-            existing_namespace.owner = create(:user)
-            existing_namespace.save
-          end
-
           it "doesn't create a project" do
             expect(Gitlab::BitbucketImport::ProjectCreator).
               not_to receive(:new)
@@ -202,10 +201,14 @@ describe Import::BitbucketController do
     end
 
     context 'user has chosen an existing nested namespace and name for the project' do
-      let(:parent_namespace) { create(:namespace, name: 'foo', owner: user) }
-      let(:nested_namespace) { create(:namespace, name: 'bar', parent: parent_namespace, owner: user) }
+      let(:parent_namespace) { create(:group, name: 'foo', owner: user) }
+      let(:nested_namespace) { create(:group, name: 'bar', parent: parent_namespace) }
       let(:test_name) { 'test_name' }
 
+      before do
+        nested_namespace.add_owner(user)
+      end
+
       it 'takes the selected namespace and name' do
         expect(Gitlab::BitbucketImport::ProjectCreator).
           to receive(:new).with(bitbucket_repo, test_name, nested_namespace, user, access_params).
@@ -248,7 +251,7 @@ describe Import::BitbucketController do
 
     context 'user has chosen existent and non-existent nested namespaces and name for the project' do
       let(:test_name) { 'test_name' }
-      let!(:parent_namespace) { create(:namespace, name: 'foo', owner: user) }
+      let!(:parent_namespace) { create(:group, name: 'foo', owner: user) }
 
       it 'takes the selected namespace and name' do
         expect(Gitlab::BitbucketImport::ProjectCreator).
diff --git a/spec/controllers/import/gitlab_controller_spec.rb b/spec/controllers/import/gitlab_controller_spec.rb
index 3270ea059fa..3afd09063d7 100644
--- a/spec/controllers/import/gitlab_controller_spec.rb
+++ b/spec/controllers/import/gitlab_controller_spec.rb
@@ -108,9 +108,13 @@ describe Import::GitlabController do
       end
 
       context "when a namespace with the GitLab.com user's username already exists" do
-        let!(:existing_namespace) { create(:namespace, name: other_username, owner: user) }
+        let!(:existing_namespace) { create(:group, name: other_username) }
 
         context "when the namespace is owned by the GitLab server user" do
+          before do
+            existing_namespace.add_owner(user)
+          end
+
           it "takes the existing namespace" do
             expect(Gitlab::GitlabImport::ProjectCreator).
               to receive(:new).with(gitlab_repo, existing_namespace, user, access_params).
@@ -121,11 +125,6 @@ describe Import::GitlabController do
         end
 
         context "when the namespace is not owned by the GitLab server user" do
-          before do
-            existing_namespace.owner = create(:user)
-            existing_namespace.save
-          end
-
           it "doesn't create a project" do
             expect(Gitlab::GitlabImport::ProjectCreator).
               not_to receive(:new)
@@ -176,8 +175,12 @@ describe Import::GitlabController do
       end
 
       context 'user has chosen an existing nested namespace for the project' do
-        let(:parent_namespace) { create(:namespace, name: 'foo', owner: user) }
-        let(:nested_namespace) { create(:namespace, name: 'bar', parent: parent_namespace, owner: user) }
+        let(:parent_namespace) { create(:group, name: 'foo', owner: user) }
+        let(:nested_namespace) { create(:group, name: 'bar', parent: parent_namespace) }
+
+        before do
+          nested_namespace.add_owner(user)
+        end
 
         it 'takes the selected namespace and name' do
           expect(Gitlab::GitlabImport::ProjectCreator).
@@ -221,7 +224,7 @@ describe Import::GitlabController do
 
       context 'user has chosen existent and non-existent nested namespaces and name for the project' do
         let(:test_name) { 'test_name' }
-        let!(:parent_namespace) { create(:namespace, name: 'foo', owner: user) }
+        let!(:parent_namespace) { create(:group, name: 'foo', owner: user) }
 
         it 'takes the selected namespace and name' do
           expect(Gitlab::GitlabImport::ProjectCreator).
diff --git a/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb b/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb
index c56fded7516..ce2b5d620fd 100644
--- a/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb
+++ b/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb
@@ -18,8 +18,8 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
       let(:subject) { described_class.new(['parent/the-Path'], migration) }
 
       it 'includes the namespace' do
-        parent = create(:namespace, path: 'parent')
-        child = create(:namespace, path: 'the-path', parent: parent)
+        parent = create(:group, path: 'parent')
+        child = create(:group, path: 'the-path', parent: parent)
 
         found_ids = subject.namespaces_for_paths(type: :child).
                       map(&:id)
@@ -30,13 +30,13 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
 
     context 'for child namespaces' do
       it 'only returns child namespaces with the correct path' do
-        _root_namespace = create(:namespace, path: 'THE-path')
-        _other_path = create(:namespace,
+        _root_namespace = create(:group, path: 'THE-path')
+        _other_path = create(:group,
                              path: 'other',
-                             parent: create(:namespace))
-        namespace = create(:namespace,
+                             parent: create(:group))
+        namespace = create(:group,
                            path: 'the-path',
-                           parent: create(:namespace))
+                           parent: create(:group))
 
         found_ids = subject.namespaces_for_paths(type: :child).
                       map(&:id)
@@ -45,13 +45,13 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
       end
 
       it 'has no namespaces that look the same' do
-        _root_namespace = create(:namespace, path: 'THE-path')
-        _similar_path = create(:namespace,
+        _root_namespace = create(:group, path: 'THE-path')
+        _similar_path = create(:group,
                              path: 'not-really-the-path',
-                             parent: create(:namespace))
-        namespace = create(:namespace,
+                             parent: create(:group))
+        namespace = create(:group,
                            path: 'the-path',
-                           parent: create(:namespace))
+                           parent: create(:group))
 
         found_ids = subject.namespaces_for_paths(type: :child).
                       map(&:id)
@@ -62,11 +62,11 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
 
     context 'for top levelnamespaces' do
       it 'only returns child namespaces with the correct path' do
-        root_namespace = create(:namespace, path: 'the-path')
-        _other_path = create(:namespace, path: 'other')
-        _child_namespace = create(:namespace,
+        root_namespace = create(:group, path: 'the-path')
+        _other_path = create(:group, path: 'other')
+        _child_namespace = create(:group,
                                   path: 'the-path',
-                                  parent: create(:namespace))
+                                  parent: create(:group))
 
         found_ids = subject.namespaces_for_paths(type: :top_level).
                       map(&:id)
@@ -75,11 +75,11 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
       end
 
       it 'has no namespaces that just look the same' do
-        root_namespace = create(:namespace, path: 'the-path')
-        _similar_path = create(:namespace, path: 'not-really-the-path')
-        _child_namespace = create(:namespace,
+        root_namespace = create(:group, path: 'the-path')
+        _similar_path = create(:group, path: 'not-really-the-path')
+        _child_namespace = create(:group,
                                   path: 'the-path',
-                                  parent: create(:namespace))
+                                  parent: create(:group))
 
         found_ids = subject.namespaces_for_paths(type: :top_level).
                       map(&:id)
@@ -124,10 +124,10 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
 
   describe "#child_ids_for_parent" do
     it "collects child ids for all levels" do
-      parent = create(:namespace)
-      first_child = create(:namespace, parent: parent)
-      second_child = create(:namespace, parent: parent)
-      third_child = create(:namespace, parent: second_child)
+      parent = create(:group)
+      first_child = create(:group, parent: parent)
+      second_child = create(:group, parent: parent)
+      third_child = create(:group, parent: second_child)
       all_ids = [parent.id, first_child.id, second_child.id, third_child.id]
 
       collected_ids = subject.child_ids_for_parent(parent, ids: [parent.id])
@@ -205,9 +205,9 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
   end
 
   describe '#rename_namespaces' do
-    let!(:top_level_namespace) { create(:namespace, path: 'the-path') }
+    let!(:top_level_namespace) { create(:group, path: 'the-path') }
     let!(:child_namespace) do
-      create(:namespace, path: 'the-path', parent: create(:namespace))
+      create(:group, path: 'the-path', parent: create(:group))
     end
 
     it 'renames top level namespaces the namespace' do
diff --git a/spec/lib/gitlab/path_regex_spec.rb b/spec/lib/gitlab/path_regex_spec.rb
new file mode 100644
index 00000000000..1eea710c80b
--- /dev/null
+++ b/spec/lib/gitlab/path_regex_spec.rb
@@ -0,0 +1,384 @@
+# coding: utf-8
+require 'spec_helper'
+
+describe Gitlab::PathRegex, lib: true do
+  # Pass in a full path to remove the format segment:
+  # `/ci/lint(.:format)` -> `/ci/lint`
+  def without_format(path)
+    path.split('(', 2)[0]
+  end
+
+  # Pass in a full path and get the last segment before a wildcard
+  # That's not a parameter
+  # `/*namespace_id/:project_id/builds/artifacts/*ref_name_and_path`
+  #    -> 'builds/artifacts'
+  def path_before_wildcard(path)
+    path = path.gsub(STARTING_WITH_NAMESPACE, "")
+    path_segments = path.split('/').reject(&:empty?)
+    wildcard_index = path_segments.index { |segment| parameter?(segment) }
+
+    segments_before_wildcard = path_segments[0..wildcard_index - 1]
+
+    segments_before_wildcard.join('/')
+  end
+
+  def parameter?(segment)
+    segment =~ /[*:]/
+  end
+
+  # If the path is reserved. Then no conflicting paths can# be created for any
+  # route using this reserved word.
+  #
+  # Both `builds/artifacts` & `build` are covered by reserving the word
+  # `build`
+  def wildcards_include?(path)
+    described_class::PROJECT_WILDCARD_ROUTES.include?(path) ||
+      described_class::PROJECT_WILDCARD_ROUTES.include?(path.split('/').first)
+  end
+
+  def failure_message(missing_words, constant_name, migration_helper)
+    missing_words = Array(missing_words)
+    <<-MSG
+      Found new routes that could cause conflicts with existing namespaced routes
+      for groups or projects.
+
+      Add <#{missing_words.join(', ')}> to `Gitlab::PathRegex::#{constant_name}
+      to make sure no projects or namespaces can be created with those paths.
+
+      To rename any existing records with those paths you can use the
+      `Gitlab::Database::RenameReservedpathsMigration::<VERSION>.#{migration_helper}`
+      migration helper.
+
+      Make sure to make a note of the renamed records in the release blog post.
+
+    MSG
+  end
+
+  let(:all_routes) do
+    route_set = Rails.application.routes
+    routes_collection = route_set.routes
+    routes_array = routes_collection.routes
+    routes_array.map { |route| route.path.spec.to_s }
+  end
+
+  let(:routes_without_format) { all_routes.map { |path| without_format(path) } }
+
+  # Routes not starting with `/:` or `/*`
+  # all routes not starting with a param
+  let(:routes_not_starting_in_wildcard) { routes_without_format.select { |p| p !~ %r{^/[:*]} } }
+
+  let(:top_level_words) do
+    routes_not_starting_in_wildcard.map do |route|
+      route.split('/')[1]
+    end.compact.uniq
+  end
+
+  # All routes that start with a namespaced path, that have 1 or more
+  # path-segments before having another wildcard parameter.
+  # - Starting with paths:
+  #   - `/*namespace_id/:project_id/`
+  #   - `/*namespace_id/:id/`
+  # - Followed by one or more path-parts not starting with `:` or `*`
+  # - Followed by a path-part that includes a wildcard parameter `*`
+  # At the time of writing these routes match: http://rubular.com/r/Rv2pDE5Dvw
+  STARTING_WITH_NAMESPACE = %r{^/\*namespace_id/:(project_)?id}
+  NON_PARAM_PARTS = %r{[^:*][a-z\-_/]*}
+  ANY_OTHER_PATH_PART = %r{[a-z\-_/:]*}
+  WILDCARD_SEGMENT = %r{\*}
+  let(:namespaced_wildcard_routes) do
+    routes_without_format.select do |p|
+      p =~ %r{#{STARTING_WITH_NAMESPACE}/#{NON_PARAM_PARTS}/#{ANY_OTHER_PATH_PART}#{WILDCARD_SEGMENT}}
+    end
+  end
+
+  # This will return all paths that are used in a namespaced route
+  # before another wildcard path:
+  #
+  # /*namespace_id/:project_id/builds/artifacts/*ref_name_and_path
+  # /*namespace_id/:project_id/info/lfs/objects/*oid
+  # /*namespace_id/:project_id/commits/*id
+  # /*namespace_id/:project_id/builds/:build_id/artifacts/file/*path
+  # -> ['builds/artifacts', 'info/lfs/objects', 'commits', 'artifacts/file']
+  let(:all_wildcard_paths) do
+    namespaced_wildcard_routes.map do |route|
+      path_before_wildcard(route)
+    end.uniq
+  end
+
+  STARTING_WITH_GROUP = %r{^/groups/\*(group_)?id/}
+  let(:group_routes) do
+    routes_without_format.select do |path|
+      path =~ STARTING_WITH_GROUP
+    end
+  end
+
+  let(:paths_after_group_id) do
+    group_routes.map do |route|
+      route.gsub(STARTING_WITH_GROUP, '').split('/').first
+    end.uniq
+  end
+
+  describe 'TOP_LEVEL_ROUTES' do
+    it 'includes all the top level namespaces' do
+      failure_block = lambda do
+        missing_words = top_level_words - described_class::TOP_LEVEL_ROUTES
+        failure_message(missing_words, 'TOP_LEVEL_ROUTES', 'rename_root_paths')
+      end
+
+      expect(described_class::TOP_LEVEL_ROUTES)
+        .to include(*top_level_words), failure_block
+    end
+  end
+
+  describe 'GROUP_ROUTES' do
+    it "don't contain a second wildcard" do
+      failure_block = lambda do
+        missing_words = paths_after_group_id - described_class::GROUP_ROUTES
+        failure_message(missing_words, 'GROUP_ROUTES', 'rename_child_paths')
+      end
+
+      expect(described_class::GROUP_ROUTES)
+        .to include(*paths_after_group_id), failure_block
+    end
+  end
+
+  describe 'PROJECT_WILDCARD_ROUTES' do
+    it 'includes all paths that can be used after a namespace/project path' do
+      aggregate_failures do
+        all_wildcard_paths.each do |path|
+          expect(wildcards_include?(path))
+            .to be(true), failure_message(path, 'PROJECT_WILDCARD_ROUTES', 'rename_wildcard_paths')
+        end
+      end
+    end
+  end
+
+  describe '.root_namespace_path_regex' do
+    subject { described_class.root_namespace_path_regex }
+
+    it 'rejects top level routes' do
+      expect(subject).not_to match('admin/')
+      expect(subject).not_to match('api/')
+      expect(subject).not_to match('.well-known/')
+    end
+
+    it 'accepts project wildcard routes' do
+      expect(subject).to match('blob/')
+      expect(subject).to match('edit/')
+      expect(subject).to match('wikis/')
+    end
+
+    it 'accepts group routes' do
+      expect(subject).to match('activity/')
+      expect(subject).to match('group_members/')
+      expect(subject).to match('subgroups/')
+    end
+
+    it 'is not case sensitive' do
+      expect(subject).not_to match('Users/')
+    end
+
+    it 'does not allow extra slashes' do
+      expect(subject).not_to match('/blob/')
+      expect(subject).not_to match('blob//')
+    end
+  end
+
+  describe '.full_namespace_path_regex' do
+    subject { described_class.full_namespace_path_regex }
+
+    context 'at the top level' do
+      context 'when the final level' do
+        it 'rejects top level routes' do
+          expect(subject).not_to match('admin/')
+          expect(subject).not_to match('api/')
+          expect(subject).not_to match('.well-known/')
+        end
+
+        it 'accepts project wildcard routes' do
+          expect(subject).to match('blob/')
+          expect(subject).to match('edit/')
+          expect(subject).to match('wikis/')
+        end
+
+        it 'accepts group routes' do
+          expect(subject).to match('activity/')
+          expect(subject).to match('group_members/')
+          expect(subject).to match('subgroups/')
+        end
+      end
+
+      context 'when more levels follow' do
+        it 'rejects top level routes' do
+          expect(subject).not_to match('admin/more/')
+          expect(subject).not_to match('api/more/')
+          expect(subject).not_to match('.well-known/more/')
+        end
+
+        it 'accepts project wildcard routes' do
+          expect(subject).to match('blob/more/')
+          expect(subject).to match('edit/more/')
+          expect(subject).to match('wikis/more/')
+          expect(subject).to match('environments/folders/')
+          expect(subject).to match('info/lfs/objects/')
+        end
+
+        it 'accepts group routes' do
+          expect(subject).to match('activity/more/')
+          expect(subject).to match('group_members/more/')
+          expect(subject).to match('subgroups/more/')
+        end
+      end
+    end
+
+    context 'at the second level' do
+      context 'when the final level' do
+        it 'accepts top level routes' do
+          expect(subject).to match('root/admin/')
+          expect(subject).to match('root/api/')
+          expect(subject).to match('root/.well-known/')
+        end
+
+        it 'rejects project wildcard routes' do
+          expect(subject).not_to match('root/blob/')
+          expect(subject).not_to match('root/edit/')
+          expect(subject).not_to match('root/wikis/')
+          expect(subject).not_to match('root/environments/folders/')
+          expect(subject).not_to match('root/info/lfs/objects/')
+        end
+
+        it 'rejects group routes' do
+          expect(subject).not_to match('root/activity/')
+          expect(subject).not_to match('root/group_members/')
+          expect(subject).not_to match('root/subgroups/')
+        end
+      end
+
+      context 'when more levels follow' do
+        it 'accepts top level routes' do
+          expect(subject).to match('root/admin/more/')
+          expect(subject).to match('root/api/more/')
+          expect(subject).to match('root/.well-known/more/')
+        end
+
+        it 'rejects project wildcard routes' do
+          expect(subject).not_to match('root/blob/more/')
+          expect(subject).not_to match('root/edit/more/')
+          expect(subject).not_to match('root/wikis/more/')
+          expect(subject).not_to match('root/environments/folders/more/')
+          expect(subject).not_to match('root/info/lfs/objects/more/')
+        end
+
+        it 'rejects group routes' do
+          expect(subject).not_to match('root/activity/more/')
+          expect(subject).not_to match('root/group_members/more/')
+          expect(subject).not_to match('root/subgroups/more/')
+        end
+      end
+    end
+
+    it 'is not case sensitive' do
+      expect(subject).not_to match('root/Blob/')
+    end
+
+    it 'does not allow extra slashes' do
+      expect(subject).not_to match('/root/admin/')
+      expect(subject).not_to match('root/admin//')
+    end
+  end
+
+  describe '.project_path_regex' do
+    subject { described_class.project_path_regex }
+
+    it 'accepts top level routes' do
+      expect(subject).to match('admin/')
+      expect(subject).to match('api/')
+      expect(subject).to match('.well-known/')
+    end
+
+    it 'rejects project wildcard routes' do
+      expect(subject).not_to match('blob/')
+      expect(subject).not_to match('edit/')
+      expect(subject).not_to match('wikis/')
+      expect(subject).not_to match('environments/folders/')
+      expect(subject).not_to match('info/lfs/objects/')
+    end
+
+    it 'accepts group routes' do
+      expect(subject).to match('activity/')
+      expect(subject).to match('group_members/')
+      expect(subject).to match('subgroups/')
+    end
+
+    it 'is not case sensitive' do
+      expect(subject).not_to match('Blob/')
+    end
+
+    it 'does not allow extra slashes' do
+      expect(subject).not_to match('/admin/')
+      expect(subject).not_to match('admin//')
+    end
+  end
+
+  describe '.full_project_path_regex' do
+    subject { described_class.full_project_path_regex }
+
+    it 'accepts top level routes' do
+      expect(subject).to match('root/admin/')
+      expect(subject).to match('root/api/')
+      expect(subject).to match('root/.well-known/')
+    end
+
+    it 'rejects project wildcard routes' do
+      expect(subject).not_to match('root/blob/')
+      expect(subject).not_to match('root/edit/')
+      expect(subject).not_to match('root/wikis/')
+      expect(subject).not_to match('root/environments/folders/')
+      expect(subject).not_to match('root/info/lfs/objects/')
+    end
+
+    it 'accepts group routes' do
+      expect(subject).to match('root/activity/')
+      expect(subject).to match('root/group_members/')
+      expect(subject).to match('root/subgroups/')
+    end
+
+    it 'is not case sensitive' do
+      expect(subject).not_to match('root/Blob/')
+    end
+
+    it 'does not allow extra slashes' do
+      expect(subject).not_to match('/root/admin/')
+      expect(subject).not_to match('root/admin//')
+    end
+  end
+
+  describe '.namespace_format_regex' do
+    subject { described_class.namespace_format_regex }
+
+    it { is_expected.to match('gitlab-ce') }
+    it { is_expected.to match('gitlab_git') }
+    it { is_expected.to match('_underscore.js') }
+    it { is_expected.to match('100px.com') }
+    it { is_expected.to match('gitlab.org') }
+    it { is_expected.not_to match('?gitlab') }
+    it { is_expected.not_to match('git lab') }
+    it { is_expected.not_to match('gitlab.git') }
+    it { is_expected.not_to match('gitlab.org.') }
+    it { is_expected.not_to match('gitlab.org/') }
+    it { is_expected.not_to match('/gitlab.org') }
+    it { is_expected.not_to match('gitlab git') }
+  end
+
+  describe '.project_path_format_regex' do
+    subject { described_class.project_path_format_regex }
+
+    it { is_expected.to match('gitlab-ce') }
+    it { is_expected.to match('gitlab_git') }
+    it { is_expected.to match('_underscore.js') }
+    it { is_expected.to match('100px.com') }
+    it { is_expected.not_to match('?gitlab') }
+    it { is_expected.not_to match('git lab') }
+    it { is_expected.not_to match('gitlab.git') }
+  end
+end
diff --git a/spec/lib/gitlab/regex_spec.rb b/spec/lib/gitlab/regex_spec.rb
index a7d1283acb8..0bee892fe0c 100644
--- a/spec/lib/gitlab/regex_spec.rb
+++ b/spec/lib/gitlab/regex_spec.rb
@@ -2,386 +2,6 @@
 require 'spec_helper'
 
 describe Gitlab::Regex, lib: true do
-  # Pass in a full path to remove the format segment:
-  # `/ci/lint(.:format)` -> `/ci/lint`
-  def without_format(path)
-    path.split('(', 2)[0]
-  end
-
-  # Pass in a full path and get the last segment before a wildcard
-  # That's not a parameter
-  # `/*namespace_id/:project_id/builds/artifacts/*ref_name_and_path`
-  #    -> 'builds/artifacts'
-  def path_before_wildcard(path)
-    path = path.gsub(STARTING_WITH_NAMESPACE, "")
-    path_segments = path.split('/').reject(&:empty?)
-    wildcard_index = path_segments.index { |segment| parameter?(segment) }
-
-    segments_before_wildcard = path_segments[0..wildcard_index - 1]
-
-    segments_before_wildcard.join('/')
-  end
-
-  def parameter?(segment)
-    segment =~ /[*:]/
-  end
-
-  # If the path is reserved. Then no conflicting paths can# be created for any
-  # route using this reserved word.
-  #
-  # Both `builds/artifacts` & `build` are covered by reserving the word
-  # `build`
-  def wildcards_include?(path)
-    described_class::PROJECT_WILDCARD_ROUTES.include?(path) ||
-      described_class::PROJECT_WILDCARD_ROUTES.include?(path.split('/').first)
-  end
-
-  def failure_message(missing_words, constant_name, migration_helper)
-    missing_words = Array(missing_words)
-    <<-MSG
-      Found new routes that could cause conflicts with existing namespaced routes
-      for groups or projects.
-
-      Add <#{missing_words.join(', ')}> to `Gitlab::Regex::#{constant_name}
-      to make sure no projects or namespaces can be created with those paths.
-
-      To rename any existing records with those paths you can use the
-      `Gitlab::Database::RenameReservedpathsMigration::<VERSION>.#{migration_helper}`
-      migration helper.
-
-      Make sure to make a note of the renamed records in the release blog post.
-
-    MSG
-  end
-
-  let(:all_routes) do
-    route_set = Rails.application.routes
-    routes_collection = route_set.routes
-    routes_array = routes_collection.routes
-    routes_array.map { |route| route.path.spec.to_s }
-  end
-
-  let(:routes_without_format) { all_routes.map { |path| without_format(path) } }
-
-  # Routes not starting with `/:` or `/*`
-  # all routes not starting with a param
-  let(:routes_not_starting_in_wildcard) { routes_without_format.select { |p| p !~ %r{^/[:*]} } }
-
-  let(:top_level_words) do
-    routes_not_starting_in_wildcard.map do |route|
-      route.split('/')[1]
-    end.compact.uniq
-  end
-
-  # All routes that start with a namespaced path, that have 1 or more
-  # path-segments before having another wildcard parameter.
-  # - Starting with paths:
-  #   - `/*namespace_id/:project_id/`
-  #   - `/*namespace_id/:id/`
-  # - Followed by one or more path-parts not starting with `:` or `*`
-  # - Followed by a path-part that includes a wildcard parameter `*`
-  # At the time of writing these routes match: http://rubular.com/r/Rv2pDE5Dvw
-  STARTING_WITH_NAMESPACE = %r{^/\*namespace_id/:(project_)?id}
-  NON_PARAM_PARTS = %r{[^:*][a-z\-_/]*}
-  ANY_OTHER_PATH_PART = %r{[a-z\-_/:]*}
-  WILDCARD_SEGMENT = %r{\*}
-  let(:namespaced_wildcard_routes) do
-    routes_without_format.select do |p|
-      p =~ %r{#{STARTING_WITH_NAMESPACE}/#{NON_PARAM_PARTS}/#{ANY_OTHER_PATH_PART}#{WILDCARD_SEGMENT}}
-    end
-  end
-
-  # This will return all paths that are used in a namespaced route
-  # before another wildcard path:
-  #
-  # /*namespace_id/:project_id/builds/artifacts/*ref_name_and_path
-  # /*namespace_id/:project_id/info/lfs/objects/*oid
-  # /*namespace_id/:project_id/commits/*id
-  # /*namespace_id/:project_id/builds/:build_id/artifacts/file/*path
-  # -> ['builds/artifacts', 'info/lfs/objects', 'commits', 'artifacts/file']
-  let(:all_wildcard_paths) do
-    namespaced_wildcard_routes.map do |route|
-      path_before_wildcard(route)
-    end.uniq
-  end
-
-  STARTING_WITH_GROUP = %r{^/groups/\*(group_)?id/}
-  let(:group_routes) do
-    routes_without_format.select do |path|
-      path =~ STARTING_WITH_GROUP
-    end
-  end
-
-  let(:paths_after_group_id) do
-    group_routes.map do |route|
-      route.gsub(STARTING_WITH_GROUP, '').split('/').first
-    end.uniq
-  end
-
-  describe 'TOP_LEVEL_ROUTES' do
-    it 'includes all the top level namespaces' do
-      failure_block = lambda do
-        missing_words = top_level_words - described_class::TOP_LEVEL_ROUTES
-        failure_message(missing_words, 'TOP_LEVEL_ROUTES', 'rename_root_paths')
-      end
-
-      expect(described_class::TOP_LEVEL_ROUTES)
-        .to include(*top_level_words), failure_block
-    end
-  end
-
-  describe 'GROUP_ROUTES' do
-    it "don't contain a second wildcard" do
-      failure_block = lambda do
-        missing_words = paths_after_group_id - described_class::GROUP_ROUTES
-        failure_message(missing_words, 'GROUP_ROUTES', 'rename_child_paths')
-      end
-
-      expect(described_class::GROUP_ROUTES)
-        .to include(*paths_after_group_id), failure_block
-    end
-  end
-
-  describe 'PROJECT_WILDCARD_ROUTES' do
-    it 'includes all paths that can be used after a namespace/project path' do
-      aggregate_failures do
-        all_wildcard_paths.each do |path|
-          expect(wildcards_include?(path))
-            .to be(true), failure_message(path, 'PROJECT_WILDCARD_ROUTES', 'rename_wildcard_paths')
-        end
-      end
-    end
-  end
-
-  describe '.root_namespace_path_regex' do
-    subject { described_class.root_namespace_path_regex }
-
-    it 'rejects top level routes' do
-      expect(subject).not_to match('admin/')
-      expect(subject).not_to match('api/')
-      expect(subject).not_to match('.well-known/')
-    end
-
-    it 'accepts project wildcard routes' do
-      expect(subject).to match('blob/')
-      expect(subject).to match('edit/')
-      expect(subject).to match('wikis/')
-    end
-
-    it 'accepts group routes' do
-      expect(subject).to match('activity/')
-      expect(subject).to match('group_members/')
-      expect(subject).to match('subgroups/')
-    end
-
-    it 'is not case sensitive' do
-      expect(subject).not_to match('Users/')
-    end
-
-    it 'does not allow extra slashes' do
-      expect(subject).not_to match('/blob/')
-      expect(subject).not_to match('blob//')
-    end
-  end
-
-  describe '.full_namespace_path_regex' do
-    subject { described_class.full_namespace_path_regex }
-
-    context 'at the top level' do
-      context 'when the final level' do
-        it 'rejects top level routes' do
-          expect(subject).not_to match('admin/')
-          expect(subject).not_to match('api/')
-          expect(subject).not_to match('.well-known/')
-        end
-
-        it 'accepts project wildcard routes' do
-          expect(subject).to match('blob/')
-          expect(subject).to match('edit/')
-          expect(subject).to match('wikis/')
-        end
-
-        it 'accepts group routes' do
-          expect(subject).to match('activity/')
-          expect(subject).to match('group_members/')
-          expect(subject).to match('subgroups/')
-        end
-      end
-
-      context 'when more levels follow' do
-        it 'rejects top level routes' do
-          expect(subject).not_to match('admin/more/')
-          expect(subject).not_to match('api/more/')
-          expect(subject).not_to match('.well-known/more/')
-        end
-
-        it 'accepts project wildcard routes' do
-          expect(subject).to match('blob/more/')
-          expect(subject).to match('edit/more/')
-          expect(subject).to match('wikis/more/')
-          expect(subject).to match('environments/folders/')
-          expect(subject).to match('info/lfs/objects/')
-        end
-
-        it 'accepts group routes' do
-          expect(subject).to match('activity/more/')
-          expect(subject).to match('group_members/more/')
-          expect(subject).to match('subgroups/more/')
-        end
-      end
-    end
-
-    context 'at the second level' do
-      context 'when the final level' do
-        it 'accepts top level routes' do
-          expect(subject).to match('root/admin/')
-          expect(subject).to match('root/api/')
-          expect(subject).to match('root/.well-known/')
-        end
-
-        it 'rejects project wildcard routes' do
-          expect(subject).not_to match('root/blob/')
-          expect(subject).not_to match('root/edit/')
-          expect(subject).not_to match('root/wikis/')
-          expect(subject).not_to match('root/environments/folders/')
-          expect(subject).not_to match('root/info/lfs/objects/')
-        end
-
-        it 'rejects group routes' do
-          expect(subject).not_to match('root/activity/')
-          expect(subject).not_to match('root/group_members/')
-          expect(subject).not_to match('root/subgroups/')
-        end
-      end
-
-      context 'when more levels follow' do
-        it 'accepts top level routes' do
-          expect(subject).to match('root/admin/more/')
-          expect(subject).to match('root/api/more/')
-          expect(subject).to match('root/.well-known/more/')
-        end
-
-        it 'rejects project wildcard routes' do
-          expect(subject).not_to match('root/blob/more/')
-          expect(subject).not_to match('root/edit/more/')
-          expect(subject).not_to match('root/wikis/more/')
-          expect(subject).not_to match('root/environments/folders/more/')
-          expect(subject).not_to match('root/info/lfs/objects/more/')
-        end
-
-        it 'rejects group routes' do
-          expect(subject).not_to match('root/activity/more/')
-          expect(subject).not_to match('root/group_members/more/')
-          expect(subject).not_to match('root/subgroups/more/')
-        end
-      end
-    end
-
-    it 'is not case sensitive' do
-      expect(subject).not_to match('root/Blob/')
-    end
-
-    it 'does not allow extra slashes' do
-      expect(subject).not_to match('/root/admin/')
-      expect(subject).not_to match('root/admin//')
-    end
-  end
-
-  describe '.project_path_regex' do
-    subject { described_class.project_path_regex }
-
-    it 'accepts top level routes' do
-      expect(subject).to match('admin/')
-      expect(subject).to match('api/')
-      expect(subject).to match('.well-known/')
-    end
-
-    it 'rejects project wildcard routes' do
-      expect(subject).not_to match('blob/')
-      expect(subject).not_to match('edit/')
-      expect(subject).not_to match('wikis/')
-      expect(subject).not_to match('environments/folders/')
-      expect(subject).not_to match('info/lfs/objects/')
-    end
-
-    it 'accepts group routes' do
-      expect(subject).to match('activity/')
-      expect(subject).to match('group_members/')
-      expect(subject).to match('subgroups/')
-    end
-
-    it 'is not case sensitive' do
-      expect(subject).not_to match('Blob/')
-    end
-
-    it 'does not allow extra slashes' do
-      expect(subject).not_to match('/admin/')
-      expect(subject).not_to match('admin//')
-    end
-  end
-
-  describe '.full_project_path_regex' do
-    subject { described_class.full_project_path_regex }
-
-    it 'accepts top level routes' do
-      expect(subject).to match('root/admin/')
-      expect(subject).to match('root/api/')
-      expect(subject).to match('root/.well-known/')
-    end
-
-    it 'rejects project wildcard routes' do
-      expect(subject).not_to match('root/blob/')
-      expect(subject).not_to match('root/edit/')
-      expect(subject).not_to match('root/wikis/')
-      expect(subject).not_to match('root/environments/folders/')
-      expect(subject).not_to match('root/info/lfs/objects/')
-    end
-
-    it 'accepts group routes' do
-      expect(subject).to match('root/activity/')
-      expect(subject).to match('root/group_members/')
-      expect(subject).to match('root/subgroups/')
-    end
-
-    it 'is not case sensitive' do
-      expect(subject).not_to match('root/Blob/')
-    end
-
-    it 'does not allow extra slashes' do
-      expect(subject).not_to match('/root/admin/')
-      expect(subject).not_to match('root/admin//')
-    end
-  end
-
-  describe '.namespace_regex' do
-    subject { described_class.namespace_regex }
-
-    it { is_expected.to match('gitlab-ce') }
-    it { is_expected.to match('gitlab_git') }
-    it { is_expected.to match('_underscore.js') }
-    it { is_expected.to match('100px.com') }
-    it { is_expected.to match('gitlab.org') }
-    it { is_expected.not_to match('?gitlab') }
-    it { is_expected.not_to match('git lab') }
-    it { is_expected.not_to match('gitlab.git') }
-    it { is_expected.not_to match('gitlab.org.') }
-    it { is_expected.not_to match('gitlab.org/') }
-    it { is_expected.not_to match('/gitlab.org') }
-    it { is_expected.not_to match('gitlab git') }
-  end
-
-  describe '.project_path_format_regex' do
-    subject { described_class.project_path_format_regex }
-
-    it { is_expected.to match('gitlab-ce') }
-    it { is_expected.to match('gitlab_git') }
-    it { is_expected.to match('_underscore.js') }
-    it { is_expected.to match('100px.com') }
-    it { is_expected.not_to match('?gitlab') }
-    it { is_expected.not_to match('git lab') }
-    it { is_expected.not_to match('gitlab.git') }
-  end
-
   describe '.project_name_regex' do
     subject { described_class.project_name_regex }
 
@@ -412,16 +32,4 @@ describe Gitlab::Regex, lib: true do
     it { is_expected.not_to match('9foo') }
     it { is_expected.not_to match('foo-') }
   end
-
-  describe '.full_namespace_regex' do
-    subject { described_class.full_namespace_regex }
-
-    it { is_expected.to match('gitlab.org') }
-    it { is_expected.to match('gitlab.org/gitlab-git') }
-    it { is_expected.not_to match('gitlab.org.') }
-    it { is_expected.not_to match('gitlab.org/') }
-    it { is_expected.not_to match('/gitlab.org') }
-    it { is_expected.not_to match('gitlab.git') }
-    it { is_expected.not_to match('gitlab git') }
-  end
 end
diff --git a/spec/models/namespace_spec.rb b/spec/models/namespace_spec.rb
index 312302afdbb..ff5e7c350aa 100644
--- a/spec/models/namespace_spec.rb
+++ b/spec/models/namespace_spec.rb
@@ -238,8 +238,8 @@ describe Namespace, models: true do
     end
 
     context 'in sub-groups' do
-      let(:parent) { create(:namespace, path: 'parent') }
-      let(:child) { create(:namespace, parent: parent, path: 'child') }
+      let(:parent) { create(:group, path: 'parent') }
+      let(:child) { create(:group, parent: parent, path: 'child') }
       let!(:project) { create(:project_empty_repo, namespace: child) }
       let(:path_in_dir) { File.join(repository_storage_path, 'parent', 'child') }
       let(:deleted_path) { File.join('parent', "child+#{child.id}+deleted") }
diff --git a/spec/models/project_services/kubernetes_service_spec.rb b/spec/models/project_services/kubernetes_service_spec.rb
index 57c51ebea7b..0dcf4a4b5d6 100644
--- a/spec/models/project_services/kubernetes_service_spec.rb
+++ b/spec/models/project_services/kubernetes_service_spec.rb
@@ -100,7 +100,7 @@ describe KubernetesService, models: true, caching: true do
 
       it 'sets the namespace to the default' do
         expect(kube_namespace).not_to be_nil
-        expect(kube_namespace[:placeholder]).to match(/\A#{Gitlab::Regex::PATH_REGEX_STR}-\d+\z/)
+        expect(kube_namespace[:placeholder]).to match(/\A#{Gitlab::PathRegex::PATH_REGEX_STR}-\d+\z/)
       end
     end
   end
@@ -215,7 +215,7 @@ describe KubernetesService, models: true, caching: true do
         kube_namespace = subject.predefined_variables.find { |h| h[:key] == 'KUBE_NAMESPACE' }
 
         expect(kube_namespace).not_to be_nil
-        expect(kube_namespace[:value]).to match(/\A#{Gitlab::Regex::PATH_REGEX_STR}-\d+\z/)
+        expect(kube_namespace[:value]).to match(/\A#{Gitlab::PathRegex::PATH_REGEX_STR}-\d+\z/)
       end
     end
   end
diff --git a/spec/requests/api/users_spec.rb b/spec/requests/api/users_spec.rb
index 4919ad19833..a2503dbeb69 100644
--- a/spec/requests/api/users_spec.rb
+++ b/spec/requests/api/users_spec.rb
@@ -287,7 +287,7 @@ describe API::Users do
       expect(json_response['message']['projects_limit']).
         to eq(['must be greater than or equal to 0'])
       expect(json_response['message']['username']).
-        to eq([Gitlab::Regex.namespace_regex_message])
+        to eq([Gitlab::PathRegex.namespace_format_message])
     end
 
     it "is not available for non admin users" do
@@ -459,7 +459,7 @@ describe API::Users do
       expect(json_response['message']['projects_limit']).
         to eq(['must be greater than or equal to 0'])
       expect(json_response['message']['username']).
-        to eq([Gitlab::Regex.namespace_regex_message])
+        to eq([Gitlab::PathRegex.namespace_format_message])
     end
 
     it 'returns 400 if provider is missing for identity update' do
diff --git a/spec/support/controllers/githubish_import_controller_shared_examples.rb b/spec/support/controllers/githubish_import_controller_shared_examples.rb
index c59b30c772d..d6b40db09ce 100644
--- a/spec/support/controllers/githubish_import_controller_shared_examples.rb
+++ b/spec/support/controllers/githubish_import_controller_shared_examples.rb
@@ -209,9 +209,13 @@ shared_examples 'a GitHub-ish import controller: POST create' do
     end
 
     context 'user has chosen a namespace and name for the project' do
-      let(:test_namespace) { create(:namespace, name: 'test_namespace', owner: user) }
+      let(:test_namespace) { create(:group, name: 'test_namespace') }
       let(:test_name) { 'test_name' }
 
+      before do
+        test_namespace.add_owner(user)
+      end
+
       it 'takes the selected namespace and name' do
         expect(Gitlab::GithubImport::ProjectCreator).
           to receive(:new).with(provider_repo, test_name, test_namespace, user, access_params, type: provider).
@@ -230,10 +234,14 @@ shared_examples 'a GitHub-ish import controller: POST create' do
     end
 
     context 'user has chosen an existing nested namespace and name for the project' do
-      let(:parent_namespace) { create(:namespace, name: 'foo', owner: user) }
-      let(:nested_namespace) { create(:namespace, name: 'bar', parent: parent_namespace, owner: user) }
+      let(:parent_namespace) { create(:group, name: 'foo', owner: user) }
+      let(:nested_namespace) { create(:group, name: 'bar', parent: parent_namespace) }
       let(:test_name) { 'test_name' }
 
+      before do
+        nested_namespace.add_owner(user)
+      end
+
       it 'takes the selected namespace and name' do
         expect(Gitlab::GithubImport::ProjectCreator).
           to receive(:new).with(provider_repo, test_name, nested_namespace, user, access_params, type: provider).
@@ -276,7 +284,7 @@ shared_examples 'a GitHub-ish import controller: POST create' do
 
     context 'user has chosen existent and non-existent nested namespaces and name for the project' do
       let(:test_name) { 'test_name' }
-      let!(:parent_namespace) { create(:namespace, name: 'foo', owner: user) }
+      let!(:parent_namespace) { create(:group, name: 'foo', owner: user) }
 
       it 'takes the selected namespace and name' do
         expect(Gitlab::GithubImport::ProjectCreator).
diff --git a/spec/validators/dynamic_path_validator_spec.rb b/spec/validators/dynamic_path_validator_spec.rb
index 03e23781d1b..5f998e78f07 100644
--- a/spec/validators/dynamic_path_validator_spec.rb
+++ b/spec/validators/dynamic_path_validator_spec.rb
@@ -15,31 +15,31 @@ describe DynamicPathValidator do
     end
 
     context 'for group' do
-      it 'calls valid_namespace_path?' do
+      it 'calls valid_group_path?' do
         group = build(:group, :nested, path: 'activity')
 
-        expect(described_class).to receive(:valid_namespace_path?).with(group.full_path).and_call_original
+        expect(described_class).to receive(:valid_group_path?).with(group.full_path).and_call_original
 
         expect(validator.path_valid_for_record?(group, 'activity')).to be_falsey
       end
     end
 
     context 'for user' do
-      it 'calls valid_namespace_path?' do
+      it 'calls valid_user_path?' do
         user = build(:user, username: 'activity')
 
-        expect(described_class).to receive(:valid_namespace_path?).with(user.full_path).and_call_original
+        expect(described_class).to receive(:valid_user_path?).with(user.full_path).and_call_original
 
         expect(validator.path_valid_for_record?(user, 'activity')).to be_truthy
       end
     end
 
     context 'for user namespace' do
-      it 'calls valid_namespace_path?' do
+      it 'calls valid_user_path?' do
         user = create(:user, username: 'activity')
         namespace = user.namespace
 
-        expect(described_class).to receive(:valid_namespace_path?).with(namespace.full_path).and_call_original
+        expect(described_class).to receive(:valid_user_path?).with(namespace.full_path).and_call_original
 
         expect(validator.path_valid_for_record?(namespace, 'activity')).to be_truthy
       end
@@ -52,7 +52,7 @@ describe DynamicPathValidator do
 
       validator.validate_each(group, :path, "Path with spaces, and comma's!")
 
-      expect(group.errors[:path]).to include(Gitlab::Regex.namespace_regex_message)
+      expect(group.errors[:path]).to include(Gitlab::PathRegex.namespace_format_message)
     end
 
     it 'adds a message when the path is not in the correct format' do