Support clearance similar to devise/warden

Clearance is a fairly popular alternative. https://github.com/thoughtbot/clearance

lib/bugsnag/middleware/clearance_user.rb

@@ -0,0 +1,32 @@
+module Bugsnag::Middleware
+  class ClearanceUser
+    COMMON_USER_FIELDS = [:email, :name, :first_name, :last_name, :created_at, :id]
+
+    def initialize(bugsnag)
+      @bugsnag = bugsnag
+    end
+
+    def call(notification)
+      if notification.request_data[:rack_env] &&
+            notification.request_data[:rack_env]["clearance"] &&
+            notification.request_data[:rack_env]["clearance"].signed_in? &&
+            notification.request_data[:rack_env]["clearance"].current_user
+
+        # Extract useful user information
+        user = {}
+        user_object = notification.request_data[:rack_env]["clearance"].current_user
+        if user_object
+          # Build the user info for this scope
+          COMMON_USER_FIELDS.each do |field|
+            user[field] = user_object.send(field) if user_object.respond_to?(field)
+          end
+        end
+
+        # We merge the first warden scope down, so that it is the main "user" for the request
+        notification.user = user unless user.empty?
+      end
+
+      @bugsnag.call(notification)
+    end
+  end
+end

lib/bugsnag/rack.rb

@@ -20,6 +20,7 @@ def initialize(app)
         # Hook up rack-based notification middlewares
         config.middleware.insert_before([Bugsnag::Middleware::Rails3Request,Bugsnag::Middleware::Callbacks], Bugsnag::Middleware::RackRequest) if defined?(::Rack)
         config.middleware.insert_before(Bugsnag::Middleware::Callbacks, Bugsnag::Middleware::WardenUser) if defined?(Warden)
+        config.middleware.insert_before(Bugsnag::Middleware::Callbacks, Bugsnag::Middleware::ClearanceUser) if defined?(Clearance)
 
         Bugsnag.configuration.app_type ||= "rack"
       end