Add external_authentication_uid to actors endpoint for querying

lib/chef_zero/endpoints/actors_endpoint.rb

@@ -8,17 +8,12 @@ class ActorsEndpoint < RestListEndpoint
       def get(request)
         response = super(request)
 
-        if request.query_params['email']
-          results = parse_json(response[2])
-          new_results = {}
-          results.each do |name, url|
-            record = get_data(request, request.rest_path + [ name ], :nil)
-            if record
-              record = parse_json(record)
-              new_results[name] = url if record['email'] == request.query_params['email']
-            end
-          end
-          response[2] = to_json(new_results)
+        # apply query filters: if one applies, stop processing rest
+        # (precendence matches chef-server: https://github.com/chef/chef-server/blob/268a0c9/src/oc_erchef/apps/chef_objects/src/chef_user.erl#L554-L559)
+        if value = request.query_params['external_authentication_uid']
+          response[2] = filter('external_authentication_uid', value, request, response[2])
+        elsif value = request.query_params['email']
+          response[2] = filter('email', value, request, response[2])
         end
 
         if request.query_params['verbose']
@@ -85,6 +80,21 @@ def post(request)
           result
         end
       end
+
+      private
+
+      def filter(key, value, request, resp)
+        results = parse_json(resp)
+        new_results = {}
+        results.each do |name, url|
+          record = get_data(request, request.rest_path + [ name ], :nil)
+          if record
+            record = parse_json(record)
+            new_results[name] = url if record[key] == value
+          end
+        end
+        to_json(new_results)
+      end
     end
   end
 end