feat: Add support for template variables in messages content (#6215)

Fixes: #6078

Co-authored-by: Sojan <sojan@pepalo.com>

spec/models/concerns/liquidable_shared.rb

@@ -0,0 +1,58 @@
+require 'rails_helper'
+
+shared_examples_for 'liqudable' do
+  context 'when liquid is present in content' do
+    let(:contact) { create(:contact, name: 'john', phone_number: '+912883') }
+    let(:conversation) { create(:conversation, id: 1, contact: contact) }
+
+    context 'when message is incoming' do
+      let(:message) { build(:message, conversation: conversation, message_type: 'incoming') }
+
+      it 'will not process liquid in content' do
+        message.content = 'hey {{contact.name}} how are you?'
+        message.save!
+        expect(message.content).to eq 'hey {{contact.name}} how are you?'
+      end
+    end
+
+    context 'when message is outgoing' do
+      let(:message) { build(:message, conversation: conversation, message_type: 'outgoing') }
+
+      it 'set replaces liquid variables in message' do
+        message.content = 'hey {{contact.name}} how are you?'
+        message.save!
+        expect(message.content).to eq 'hey john how are you?'
+      end
+
+      it 'process liquid operators like default value' do
+        message.content = 'Can we send you an email at {{ contact.email | default: "default"  }} ?'
+        message.save!
+        expect(message.content).to eq 'Can we send you an email at default ?'
+      end
+
+      it 'return empty string when value is not available' do
+        message.content = 'Can we send you an email at {{contact.email}}?'
+        message.save!
+        expect(message.content).to eq 'Can we send you an email at ?'
+      end
+
+      it 'will not process liquid tags in multiple code blocks' do
+        message.content = 'hey {{contact.name}} how are you? ```code: {{contact.name}}``` ``` code: {{contact.name}} ``` test `{{contact.name}}`'
+        message.save!
+        expect(message.content).to eq 'hey john how are you? ```code: {{contact.name}}``` ``` code: {{contact.name}} ``` test `{{contact.name}}`'
+      end
+
+      it 'will not process liquid tags in single ticks' do
+        message.content = 'hey {{contact.name}} how are you? ` code: {{contact.name}} ` ` code: {{contact.name}} ` test'
+        message.save!
+        expect(message.content).to eq 'hey john how are you? ` code: {{contact.name}} ` ` code: {{contact.name}} ` test'
+      end
+
+      it 'will not throw error for broken quotes' do
+        message.content = 'hey {{contact.name}} how are you? ` code: {{contact.name}} ` ` code: {{contact.name}} test'
+        message.save!
+        expect(message.content).to eq 'hey john how are you? ` code: {{contact.name}} ` ` code: john test'
+      end
+    end
+  end
+end

spec/models/message_spec.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'rails_helper'
+require Rails.root.join 'spec/models/concerns/liquidable_shared.rb'
 
 RSpec.describe Message, type: :model do
   context 'with validations' do
@@ -9,6 +10,10 @@ RSpec.describe Message, type: :model do
     it { is_expected.to validate_presence_of(:account_id) }
   end
 
+  describe 'concerns' do
+    it_behaves_like 'liqudable'
+  end
+
   describe '#reopen_conversation' do
     let(:conversation) { create(:conversation) }
     let(:message) { build(:message, message_type: :incoming, conversation: conversation) }