Convert HttpLog request/response attrs to UTF8 before saving (fixes #2100)

app/models/http_log.rb

@@ -4,6 +4,9 @@ class HttpLog < ApplicationModel
   store :request
   store :response
 
+  # See https://github.com/zammad/zammad/issues/2100
+  before_save :messages_to_utf8
+
 =begin
 
 cleanup old http logs
@@ -21,4 +24,10 @@ optional you can put the max oldest chat entries as argument
     true
   end
 
+  private
+
+  def messages_to_utf8
+    request.transform_values! { |v| v.try(:utf8_encode) || v }
+    response.transform_values! { |v| v.try(:utf8_encode) || v }
+  end
 end

spec/factories/http_log.rb

@@ -0,0 +1,12 @@
+FactoryBot.define do
+  factory :http_log do
+    direction              'in'
+    facility               'cti'
+    add_attribute(:method) { 'post' }
+    url                    'https://zammad.fqdn.com/api/v1/integration/cti/log'
+    request                { { content: 'foo' } }
+    response               { { content: 'bar' } }
+    created_by_id          1
+    updated_by_id          1
+  end
+end

spec/models/http_log_spec.rb

@@ -0,0 +1,19 @@
+require 'rails_helper'
+
+RSpec.describe HttpLog do
+  let(:subject) { build(:http_log) }
+
+  describe 'callbacks' do
+    # See https://github.com/zammad/zammad/issues/2100
+    it 'converts request/response message data to UTF-8 before saving' do
+      subject.request[:content]  = 'foo'.force_encoding('ascii-8bit')
+      subject.response[:content] = 'bar'.force_encoding('ascii-8bit')
+
+      # rubocop:disable Layout/MultilineMethodCallIndentation
+      expect { subject.save }
+        .to change { subject.request[:content].encoding.name }.from('ASCII-8BIT').to('UTF-8')
+        .and change { subject.response[:content].encoding.name }.from('ASCII-8BIT').to('UTF-8')
+      # rubocop:enable Layout/MultilineMethodCallIndentation
+    end
+  end
+end