From 148816cd67a314f17e79c107270cc708501bdd39 Mon Sep 17 00:00:00 2001
From: Bob Van Landuyt <bob@vanlanduyt.co>
Date: Mon, 11 Dec 2017 15:21:06 +0100
Subject: Port `read_cross_project` ability from EE

---
 app/finders/concerns/finder_methods.rb | 51 ++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 app/finders/concerns/finder_methods.rb

(limited to 'app/finders/concerns/finder_methods.rb')

diff --git a/app/finders/concerns/finder_methods.rb b/app/finders/concerns/finder_methods.rb
new file mode 100644
index 00000000000..2e905fa5750
--- /dev/null
+++ b/app/finders/concerns/finder_methods.rb
@@ -0,0 +1,51 @@
+module FinderMethods
+  def find_by!(*args)
+    raise_not_found_unless_authorized execute.find_by!(*args)
+  end
+
+  def find_by(*args)
+    if_authorized execute.find_by(*args)
+  end
+
+  def find(*args)
+    raise_not_found_unless_authorized model.find(*args)
+  end
+
+  private
+
+  def raise_not_found_unless_authorized(result)
+    result = if_authorized(result)
+
+    raise ActiveRecord::RecordNotFound.new("Couldn't find #{model}") unless result
+
+    result
+  end
+
+  def if_authorized(result)
+    # Return the result if the finder does not perform authorization checks.
+    # this is currently the case in the `MilestoneFinder`
+    return result unless respond_to?(:current_user)
+
+    if can_read_object?(result)
+      result
+    else
+      nil
+    end
+  end
+
+  def can_read_object?(object)
+    # When there's no policy, we'll allow the read, this is for example the case
+    # for Todos
+    return true unless DeclarativePolicy.has_policy?(object)
+
+    model_name = object&.model_name || model.model_name
+
+    Ability.allowed?(current_user, :"read_#{model_name.singular}", object)
+  end
+
+  # This fetches the model from the `ActiveRecord::Relation` but does not
+  # actually execute the query.
+  def model
+    execute.model
+  end
+end
-- 
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