GRN2-174: Added 404 if user does not exist (#609)

* Added 404 if user does not exist

* Differentiated between 404 and 500

* Rspec fixes

app/controllers/application_controller.rb

@@ -131,10 +131,21 @@ class ApplicationController < ActionController::Base
   end
 
   def set_user_domain
-    @user_domain = if Rails.env.test? || !Rails.configuration.loadbalanced_configuration
-      "greenlight"
+    if Rails.env.test? || !Rails.configuration.loadbalanced_configuration
+      @user_domain = "greenlight"
     else
-      parse_user_domain(request.host)
+      @user_domain = parse_user_domain(request.host)
+
+      # Checks to see if the user exists
+      begin
+        retrieve_provider_info(@user_domain, 'api2', 'getUserGreenlightCredentials')
+      rescue => e
+        if e.message.eql? "No user with that id exists"
+          render "errors/not_found", locals: { user_not_found: true }
+        else
+          render "errors/internal_error"
+        end
+      end
     end
   end
   helper_method :set_user_domain

app/views/errors/not_found.html.erb

@@ -15,9 +15,14 @@
 
 <div class="container text-center pt-9">
   <div class="display-1 text-muted mb-5">404</div>
-  <h1 class="h2 mb-3"><%= t("errors.not_found.message") %></h1>
-  <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.not_found.help") %></p>
-  <a class="btn btn-primary" href="javascript:history.back()">
-    <i class="fas fa-arrow-left mr-2"></i><%= t("go_back") %>
-  </a>
+  <% if defined?(user_not_found) %>
+    <h1 class="h2 mb-3"><%= t("errors.not_found.user_message") %></h1>
+    <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.not_found.user_help") %></p>
+  <% else %>
+    <h1 class="h2 mb-3"><%= t("errors.not_found.message") %></h1>
+    <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.not_found.help") %></p>
+    <a class="btn btn-primary" href="javascript:history.back()">
+      <i class="fas fa-arrow-left mr-2"></i><%= t("go_back") %>
+    </a>
+  <% end %>
 </div>