feat: Add company model and API with tests (#12548)

# Pull Request Template

## Description

* add Company model with validations for name, domain, description and
  avatar
* Add database migration fo
* Implement endpoints for company CRUD operations
* Add optional company relationship for contacts
* Add test for models, controllers, factories and policies
* Add authorization policies restricting delete to admins
* support JSON API responses
Please include a summary of the change and issue(s) fixed. Also, mention
relevant motivation, context, and any dependencies that this change
requires.

Fixes #(cw-5650)

## Type of change

Please delete options that are not relevant.

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update

## How Has This Been Tested?

Tests are implemented using `RSpec`

```
$ bundle exec rails db:migrate
$ bundle exec rspec spec/models/company_spec.rb spec/controllers/api/v1/accounts/companies_controller_spec.rb
```

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

enterprise/app/controllers/api/v1/accounts/companies_controller.rb

@@ -0,0 +1,40 @@
+class Api::V1::Accounts::CompaniesController < Api::V1::Accounts::EnterpriseAccountsController
+  before_action :check_authorization
+  before_action :fetch_company, only: [:show, :update, :destroy]
+
+  def index
+    @companies = Current.account.companies.ordered_by_name
+  end
+
+  def show; end
+
+  def create
+    @company = Current.account.companies.build(company_params)
+    @company.save!
+  end
+
+  def update
+    @company.update!(company_params)
+  end
+
+  def destroy
+    @company.destroy!
+    head :ok
+  end
+
+  private
+
+  def check_authorization
+    raise Pundit::NotAuthorizedError unless ChatwootApp.enterprise?
+
+    authorize(Company)
+  end
+
+  def fetch_company
+    @company = Current.account.companies.find(params[:id])
+  end
+
+  def company_params
+    params.require(:company).permit(:name, :domain, :description, :avatar)
+  end
+end

enterprise/app/models/company.rb

@@ -0,0 +1,33 @@
+# == Schema Information
+#
+# Table name: companies
+#
+#  id          :bigint           not null, primary key
+#  description :text
+#  domain      :string
+#  name        :string           not null
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#  account_id  :bigint           not null
+#
+# Indexes
+#
+#  index_companies_on_account_id             (account_id)
+#  index_companies_on_domain_and_account_id  (domain,account_id)
+#  index_companies_on_name_and_account_id    (name,account_id)
+#
+class Company < ApplicationRecord
+  include Avatarable
+  validates :account_id, presence: true
+  validates :name, presence: true, length: { maximum: Limits::COMPANY_NAME_LENGTH_LIMIT }
+  validates :domain, allow_blank: true, format: {
+    with: /\A[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?)+\z/,
+    message: I18n.t('errors.companies.domain.invalid')
+  }
+  validates :description, length: { maximum: Limits::COMPANY_DESCRIPTION_LENGTH_LIMIT }
+
+  belongs_to :account
+  has_many :contacts, dependent: :nullify
+
+  scope :ordered_by_name, -> { order(:name) }
+end

enterprise/app/models/enterprise/concerns/account.rb

@@ -13,6 +13,7 @@ module Enterprise::Concerns::Account
     has_many :captain_custom_tools, dependent: :destroy_async, class_name: 'Captain::CustomTool'
 
     has_many :copilot_threads, dependent: :destroy_async
+    has_many :companies, dependent: :destroy_async
     has_many :voice_channels, dependent: :destroy_async, class_name: '::Channel::Voice'
 
     has_one :saml_settings, dependent: :destroy_async, class_name: 'AccountSamlSettings'

enterprise/app/models/enterprise/concerns/contact.rb

@@ -0,0 +1,6 @@
+module Enterprise::Concerns::Contact
+  extend ActiveSupport::Concern
+  included do
+    belongs_to :company, optional: true
+  end
+end

enterprise/app/policies/company_policy.rb

@@ -0,0 +1,21 @@
+class CompanyPolicy < ApplicationPolicy
+  def index?
+    true
+  end
+
+  def show?
+    true
+  end
+
+  def create?
+    true
+  end
+
+  def update?
+    true
+  end
+
+  def destroy?
+    @account_user.administrator?
+  end
+end

enterprise/app/views/api/v1/accounts/companies/_company.json.jbuilder

@@ -0,0 +1,7 @@
+json.id company.id
+json.name company.name
+json.domain company.domain
+json.description company.description
+json.avatar_url company.avatar_url
+json.created_at company.created_at
+json.updated_at company.updated_at

enterprise/app/views/api/v1/accounts/companies/create.json.jbuilder

@@ -0,0 +1,3 @@
+json.payload do
+  json.partial! 'company', company: @company
+end

enterprise/app/views/api/v1/accounts/companies/index.json.jbuilder

@@ -0,0 +1,5 @@
+json.payload do
+  json.array! @companies do |company|
+    json.partial! 'company', company: company
+  end
+end

enterprise/app/views/api/v1/accounts/companies/show.json.jbuilder

@@ -0,0 +1,3 @@
+json.payload do
+  json.partial! 'company', company: @company
+end

enterprise/app/views/api/v1/accounts/companies/update.json.jbuilder

@@ -0,0 +1,3 @@
+json.payload do
+  json.partial! 'company', company: @company
+end