- Fixes #3292: Unable to manage Microsoft365/Google Channel accounts if XOAUTH2 token can't get refreshed.

- Fixes #3294: Failing XOAUTH2 Channel (Gmail / Office365) token refresh causes following Channels not to be fetched.

app/models/channel.rb

@@ -8,7 +8,6 @@ class Channel < ApplicationModel
   store :options
   store :preferences
 
-  after_initialize :refresh_xoauth2!
   after_create   :email_address_check
   after_update   :email_address_check
   after_destroy  :email_address_check
@@ -48,7 +47,8 @@ fetch one account
       adapter_options = options[:inbound][:options]
     end
 
-    begin
+    refresh_xoauth2!
+
     driver_class    = self.class.driver_class(adapter)
     driver_instance = driver_class.new
     return if !force && !driver_instance.fetchable?(self)
@@ -69,7 +69,6 @@ fetch one account
     save!
     false
   end
-  end
 
 =begin
 
@@ -250,14 +249,17 @@ send via account
       adapter         = options[:outbound][:adapter]
       adapter_options = options[:outbound][:options]
     end
-    result = nil
-    begin
+
+    refresh_xoauth2!
+
     driver_class    = self.class.driver_class(adapter)
     driver_instance = driver_class.new
     result = driver_instance.send(adapter_options, params, notification)
     self.status_out   = 'ok'
     self.last_log_out = ''
     save!
+
+    result
   rescue => e
     error = "Can't use Channel::Driver::#{adapter.to_classname}: #{e.inspect}"
     logger.error error
@@ -267,8 +269,6 @@ send via account
     save!
     raise error
   end
-    result
-  end
 
 =begin
 
@@ -338,6 +338,7 @@ get instance of channel driver
 
   def refresh_xoauth2!
     return if options.dig(:auth, :type) != 'XOAUTH2'
+    return if ApplicationHandleInfo.current == 'application_server'
 
     result = ExternalCredential.refresh_token(options[:auth][:provider], options[:auth])
 
@@ -347,16 +348,10 @@ get instance of channel driver
 
     return if new_record?
 
-    # ATTENTION: We don't want to execute any other callbacks here
-    # because `after_initialize` leaks the current scope of the Channel class
-    # as described here: https://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-new
-    # which leads to unexpected effects like:
-    # Channel.where(area: 'Google::Account').limit(1).find_each { |c| puts Channel.all.to_sql }
-    # => "SELECT "channels".* FROM "channels" WHERE "channels"."area" = 'Google::Account'"
-    update_column(:options, options) # rubocop:disable Rails/SkipsModelValidations
+    save!
   rescue => e
     logger.error e
-    raise "Failed to refresh XOAUTH2 access_token of provider '#{options[:auth][:provider]}'! #{e.inspect}"
+    raise "Failed to refresh XOAUTH2 access_token of provider '#{options[:auth][:provider]}': #{e.message}"
   end
 
   private

spec/factories/channel.rb

@@ -1,9 +1,5 @@
 FactoryBot.define do
   factory :channel do
-    # ensure the `refresh_xoauth2!` `after_initialize` callback gets executed
-    # https://stackoverflow.com/questions/5916162/problem-with-factory-girl-association-and-after-initialize#comment51639005_28057070
-    initialize_with { new(attributes) }
-
     area          { 'Email::Dummy' }
     group         { ::Group.find(1) }
     active        { true }
@@ -16,13 +12,23 @@ FactoryBot.define do
       area { 'Email::Account' }
       options do
         {
-          inbound:  {
+          inbound:  inbound,
+          outbound: outbound,
+        }
+      end
+
+      transient do
+        inbound do
+          {
             adapter: 'null', options: {}
-          },
-          outbound: {
+          }
+        end
+
+        outbound do
+          {
             adapter: 'sendmail'
           }
-        }
+        end
       end
     end
 

spec/models/channel_spec.rb

@@ -2,10 +2,94 @@ require 'rails_helper'
 
 RSpec.describe Channel, type: :model do
 
+  describe '.fetch' do
+
+    describe '#refresh_xoauth2! fails' do
+
+      let(:channel) { create(:channel, area: 'SomeXOAUTH2::Account', options: { adapter: 'DummyXOAUTH2', auth: { type: 'XOAUTH2' } }) }
+
+      before do
+        allow(ExternalCredential).to receive(:refresh_token).and_raise(RuntimeError)
+      end
+
+      it 'changes Channel status to error' do
+        expect { described_class.fetch }.to change { channel.reload.status_in }.to('error')
+      end
+    end
+
+    context 'when one adapter fetch fails' do
+
+      let(:failing_adapter_class) do
+        Class.new(Channel::Driver::Null) do
+          def fetchable?(*)
+            true
+          end
+
+          def fetch(*)
+            raise 'some error'
+          end
+        end
+      end
+
+      let(:dummy_adapter_class) do
+        Class.new(Channel::Driver::Null) do
+          def fetchable?(*)
+            true
+          end
+        end
+      end
+
+      let(:failing_channel) do
+        create(:email_channel, inbound: {
+                 adapter: 'failing',
+                 options: {}
+               })
+      end
+
+      let(:other_channel) do
+        create(:email_channel, inbound: {
+                 adapter: 'dummy',
+                 options: {}
+               })
+      end
+
+      before do
+        allow(described_class).to receive(:driver_class).with('dummy').and_return(dummy_adapter_class)
+        allow(described_class).to receive(:driver_class).with('failing').and_return(failing_adapter_class)
+
+        failing_channel
+        other_channel
+      end
+
+      it 'adds error flag to the failing Channel' do
+        expect { described_class.fetch }.to change { failing_channel.reload.preferences[:last_fetch] }.and change { failing_channel.reload.status_in }.to('error')
+      end
+
+      it 'fetches others anyway' do
+        expect { described_class.fetch }.to change { other_channel.reload.preferences[:last_fetch] }.and change { other_channel.reload.status_in }.to('ok')
+      end
+    end
+  end
+
   context 'when authentication type is XOAUTH2' do
 
     shared_examples 'common XOAUTH2' do
 
+      context 'when token refresh fails' do
+
+        let(:exception) { DummyExternalCredentialsBackendError.new('something unexpected happened here') }
+
+        before do
+          stub_const('DummyExternalCredentialsBackendError', Class.new(StandardError))
+
+          allow(ExternalCredential).to receive(:refresh_token).and_raise(exception)
+        end
+
+        it 'raises RuntimeError' do
+          expect { channel.refresh_xoauth2! }.to raise_exception(RuntimeError, /#{exception.message}/)
+        end
+      end
+
       context 'when non-XOAUTH2 channels are present' do
 
         let!(:email_address) { create(:email_address, channel: create(:channel, area: 'Some::Other')) }

spec/requests/integration/gmail_spec.rb

@@ -1,6 +1,8 @@
 require 'rails_helper'
 RSpec.describe 'Gmail XOAUTH2' do # rubocop:disable RSpec/DescribeClass
-  let(:channel) { create(:google_channel) }
+  let(:channel) do
+    create(:google_channel).tap(&:refresh_xoauth2!)
+  end
 
   before do
     required_envs = %w[GMAIL_REFRESH_TOKEN GMAIL_CLIENT_ID GMAIL_CLIENT_SECRET GMAIL_USER]

spec/requests/integration/microsoft365_spec.rb

@@ -1,6 +1,8 @@
 require 'rails_helper'
 RSpec.describe 'Microsoft365 XOAUTH2' do # rubocop:disable RSpec/DescribeClass
-  let(:channel) { create(:microsoft365_channel) }
+  let(:channel) do
+    create(:microsoft365_channel).tap(&:refresh_xoauth2!)
+  end
 
   before do
     required_envs = %w[MICROSOFT365_REFRESH_TOKEN MICROSOFT365_CLIENT_ID MICROSOFT365_CLIENT_SECRET MICROSOFT365_USER]