3 files changed, 27 insertions, 0 deletions
diff --git a/lib/constraints/group_url_constrainer.rb b/lib/constraints/group_url_constrainer.rb
new file mode 100644
index 00000000000..ca39b1961ae
--- /dev/null
+++ b/lib/constraints/group_url_constrainer.rb
@@ -0,0 +1,7 @@
+require 'constraints/namespace_url_constrainer'
+
+class GroupUrlConstrainer < NamespaceUrlConstrainer
+  def find_resource(id)
+    Group.find_by_path(id)
+  end
+end
diff --git a/lib/constraints/namespace_url_constrainer.rb b/lib/constraints/namespace_url_constrainer.rb
new file mode 100644
index 00000000000..23920193743
--- /dev/null
+++ b/lib/constraints/namespace_url_constrainer.rb
@@ -0,0 +1,13 @@
+class NamespaceUrlConstrainer
+  def matches?(request)
+    id = request.path.sub(/\A\/+/, '').split('/').first.sub(/.atom\z/, '')
+
+    if id =~ Gitlab::Regex.namespace_regex
+      find_resource(id)
+    end
+  end
+
+  def find_resource(id)
+    Namespace.find_by_path(id)
+  end
+end
diff --git a/lib/constraints/user_url_constrainer.rb b/lib/constraints/user_url_constrainer.rb
new file mode 100644
index 00000000000..ef38d47d5c6
--- /dev/null
+++ b/lib/constraints/user_url_constrainer.rb
@@ -0,0 +1,7 @@
+require 'constraints/namespace_url_constrainer'
+
+class UserUrlConstrainer < NamespaceUrlConstrainer
+  def find_resource(id)
+    User.find_by_username(id)
+  end
+end