Topic/1064 extend notification channel

coscine/issues#1064

src/NotificationBus/Controller/NotificationBusController.cs

@@ -8,6 +8,7 @@ using Coscine.NotificationConfiguration;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Newtonsoft.Json.Linq;
+using Stubble.Core.Builders;
 using System;
 using System.Collections.Generic;
 using System.Reflection;
@@ -111,7 +112,25 @@ namespace Coscine.Api.NotificationBus.Controllers
             {
                 language = _languageModel.GetById(new Guid(user.LanguageId.ToString())).Abbreviation;
             }
-            return (JObject)(action.Template[channelName][language]);
+            var template = (JObject)(action.Template[channelName][language]);
+
+            var stubble = new StubbleBuilder().Build();
+
+            var dict = new Dictionary<string, object>();
+            if (requestArgs["placeholder"] != null)
+            {
+                dict = ((JObject)(requestArgs["placeholder"])).ToObject<Dictionary<string, object>>();
+            }            
+            dict.Add("_targetUserName", user.DisplayName);
+            dict.Add("_projectName", project.DisplayName);
+
+            foreach (JProperty property in template.Properties())
+            {
+                template[property.Name] = stubble.Render(template[property.Name].ToString(), dict);
+            }
+
+            return template;
+
         }
 
         private List<User> GetUsers(List<string> userIds)