add policies, and factor out ProjectPolicy

1 files changed, 25 insertions, 0 deletions

diff --git a/app/policies/base_policy.rb b/app/policies/base_policy.rb
new file mode 100644
index 00000000000..3f52b0b005a
--- /dev/null
+++ b/app/policies/base_policy.rb
@@ -0,0 +1,25 @@
+class BasePolicy
+  def initialize(user, subject)
+    @user = user
+    @subject = subject
+  end
+
+  def abilities
+    @can = Set.new
+    @cannot = Set.new
+    generate!
+    @can - @cannot
+  end
+
+  def generate!
+    raise 'abstract'
+  end
+
+  def can!(*rules)
+    @can.merge(rules)
+  end
+
+  def cannot!(*rules)
+    @cannot.merge(rules)
+  end
+end