[FIX] Account for users without an avatar or group

1. Ensure new users belong to an Agent

Users may come without the correct group information, leading
to a situation where they have no Agent assigned to them.
The application cannot handle this, so we ensure new users
are at least associated to the new Anonymous Agent.

2. Introduce a default avatar

Users coming without an avatar would see a broken view.
Now they're assigned a default avatar, which shows the IN COMMON
icon logo instead.

4 files changed, 27 insertions, 4 deletions

diff --git a/app/controllers/welcome_controller.rb b/app/controllers/welcome_controller.rb
index 85246e5..5fce0cf 100644
--- a/app/controllers/welcome_controller.rb
+++ b/app/controllers/welcome_controller.rb
@@ -121,16 +121,15 @@ class WelcomeController < ApplicationController
   # Update user agents
   def perform_background_jobs
     if @current_user.present?
-      AgencyWatcherJob.perform_later(@current_user, @sso.user_info[:groups].split(','))
+      EnsureAgentJob.perform_later(@current_user, @sso.user_info[:groups].split(','))
     end
   end
 
   # Save User ID and current agent in session
   def update_current_session
     if @current_user.present?
-      session[:current_user] = @current_user[:external_id]
-      # TODO: make this a bit smarter
-      session[:current_agent] = @current_user&.agents&.pluck(:name)&.last
+      session[:current_user]  = @current_user[:external_id]
+      session[:current_agent] = current_agent_name
     end
   end
 end
diff --git a/app/helpers/users_helper.rb b/app/helpers/users_helper.rb
index 0adb3be..1520238 100644
--- a/app/helpers/users_helper.rb
+++ b/app/helpers/users_helper.rb
@@ -3,4 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
 module UsersHelper
+  def default_user_avatar_url
+    "https://talk.incommon.cc/uploads/talk_incommon_cc/optimized/1X/ae4533e882f427b1ae870080a42978c67c6437cc_2_32x32.png"
+  end
 end
diff --git a/app/jobs/ensure_agent_job.rb b/app/jobs/ensure_agent_job.rb
new file mode 100644
index 0000000..c754fc0
--- /dev/null
+++ b/app/jobs/ensure_agent_job.rb
@@ -0,0 +1,15 @@
+class EnsureAgentJob < ApplicationJob
+  queue_as :default
+
+  include AgentsHelper
+
+  def perform(user, groups)
+    # Ensure the logged in user has a current agent
+    # In order to do this, we first check the existing agents against the user's
+    # groups. If none match, we assign the user to the default Anonymous agent.
+    existing_agents = Agent.find_by(name: groups)
+    if existing_agents.nil?
+      user.agents << default_agent unless user.agents.include? default_agent
+    end
+  end
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index 9b199ac..7288412 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -5,4 +5,10 @@
 class User < ApplicationRecord
   has_many :agencies
   has_many :agents, through: :agencies, source: :agent
+
+  include UsersHelper
+
+  def avatar_url
+    attributes[:avatar_url] || default_user_avatar_url
+  end
 end