# Magento_Backend module

This module contains common infrastructure and assets for other modules to be defined and used in their
administration user interface (UI).

This module does not contain anything specific to other modules. Among many things it handles the logic of authenticating and authorizing users.

## Installation details

Before disabling or uninstalling this module, note that the following modules depend on this module:

- Magento_Analytics
- Magento_Authorization
- Magento_NewRelicReporting
- Magento_ProductVideo
- Magento_ReleaseNotification
- Magento_Search
- Magento_Security
- Magento_Swatches
- Magento_Ui
- Magento_User
- Magento_Webapi

For information about module installation, see [Enable or disable modules](https://experienceleague.adobe.com/en/docs/commerce-operations/installation-guide/tutorials/manage-modules).

## Structure

Beyond the [usual module file structure](https://developer.adobe.com/commerce/php/architecture/modules/overview/), this module contains a directory `Service/V1`.

`Service/V1` - contains logic to provide a list of modules installed in the application.

For information about the typical file structure of a module, see [Module file structure](https://developer.adobe.com/commerce/php/development/build/component-file-structure/#module-file-structure).

## Extensibility

Extension developers can interact with this module. For more information about the extension mechanism, see [Plugins](https://developer.adobe.com/commerce/php/development/components/plugins/).

[The dependency injection mechanism](https://developer.adobe.com/commerce/php/development/components/dependency-injection/) enables you to override the functionality of this module.

### Events

The module dispatches the following events:

- `adminhtml_block_html_before` event in the `\Magento\Backend\Block\Template::_toHtml()` method. Parameters:
  - `block` is the backend block template (this) (`\Magento\Backend\Block\Template` class).
- `adminhtml_store_edit_form_prepare_form` event in the `\Magento\Backend\Block\System\Store\Edit\AbstractForm::_prepareForm()` method. Parameters:
  - `block` is the AbstractForm block (this) (`\Magento\Backend\Block\System\Store\Edit\AbstractForm` class).
- `backend_block_widget_grid_prepare_grid_before` event in the `\Magento\Backend\Block\Widget\Grid::_prepareGrid()` method. Parameters:
  - `grid` is the widget grid block (this) (`\Magento\Backend\Block\Widget\Grid` class)
  - `collection` is the grid collection (`\Magento\Framework\Data\Collection` class).
- `adminhtml_cache_flush_system` event in the `\Magento\Backend\Console\Command\CacheCleanCommand::performAction()` method.
- `adminhtml_cache_flush_all` event in the `\Magento\Backend\Console\Command\CacheFlushCommand::performAction()` method.
- `clean_catalog_images_cache_after` event in the `\Magento\Backend\Controller\Adminhtml\Cache\CleanImages::execute()` method.
- `clean_media_cache_after` event in the `\Magento\Backend\Controller\Adminhtml\Cache\CleanMedia::execute()` method.
- `clean_static_files_cache_after` event in the `\Magento\Backend\Controller\Adminhtml\Cache\CleanStaticFiles::execute()` method.
- `adminhtml_cache_flush_all` event in the `\Magento\Backend\Controller\Adminhtml\Cache\FlushAll::execute()` method.
- `adminhtml_cache_flush_system` event in the `\Magento\Backend\Controller\Adminhtml\Cache\FlushSystem::execute()` method.
- `theme_save_after` event in the `\Magento\Backend\Controller\Adminhtml\System\Design\Save::execute()` method.
- `backend_auth_user_login_success` event in the `\Magento\Backend\Model\Auth::login()` method. Parameters:
  - `user` is the credential storage object (`null | \Magento\Backend\Model\Auth\Credential\StorageInterface`)
- `backend_auth_user_login_failed` event in the `\Magento\Backend\Model\Auth::login()` method. Parameters:
  - `user_name` is username extracted from the credential storage object (`null | \Magento\Backend\Model\Auth\Credential\StorageInterface`)
  - `exception` any exception generated (`\Magento\Framework\Exception\LocalizedException | \Magento\Framework\Exception\Plugin\AuthenticationException`)

For information about events, see [Events and observers](https://developer.adobe.com/commerce/php/development/components/events-and-observers/#events).

### Layouts

This module introduces the following layouts and layout handles in the `view/adminhtml/layout` directory:

- `admin_login`
- `adminhtml_auth_login`
- `adminhtml_cache_block`
- `adminhtml_cache_index`
- `adminhtml_dashboard_customersmost`
- `adminhtml_dashboard_customersnewest`
- `adminhtml_dashboard_index`
- `adminhtml_dashboard_productsviewed`
- `adminhtml_denied`
- `adminhtml_noroute`
- `adminhtml_system_account_index`
- `adminhtml_system_design_edit`
- `adminhtml_system_design_grid`
- `adminhtml_system_design_grid_block`
- `adminhtml_system_design_index`
- `adminhtml_system_store_deletestore`
- `adminhtml_system_store_editstore`
- `adminhtml_system_store_grid_block`
- `adminhtml_system_store_index`
- `default`
- `editor`
- `empty`
- `formkey`
- `overlay_popup`
- `popup`

For more information about layouts, see the [Layout documentation](https://developer.adobe.com/commerce/frontend-core/guide/layouts/).

### UI components

You can extend this module using the following configuration files:

- `view/adminhtml/ui_component/design_config_form.xml`
- `view/adminhtml/ui_component/design_config_listing.xml`

For information about UI components, see [Overview of UI components](https://developer.adobe.com/commerce/frontend-core/ui-components/).

## Additional information

For information about significant changes in patch releases, see [Release information](https://experienceleague.adobe.com/en/docs/commerce-operations/release/notes/overview).