Breaking: #102645 - More strict Context handling

See forge#102645

Description

Class \TYPO3\CMS\Core\Context\Context is a stateful singleton class set up pretty early by the frontend or backend application after the request object has been created. Its state is then further changed by various frontend and backend middlewares. It can be retrieved using dependency injection or GeneralUtility::makeInstance() in consuming classes.

To clean up Context-related code a bit, the following changes have been made:

  • Method __construct() removed from \TYPO3\CMS\Core\Context\Context

  • Class \TYPO3\CMS\Core\Context\ContextAwareInterface removed

  • Trait \TYPO3\CMS\Core\Context\ContextAwareTrait removed

Impact

Handing over manual arguments to the constructor of __construct() does not have an effect anymore, and using the interface or the trait will raise a fatal PHP error.

Affected installations

Most likely, not too many instances are affected: An instance of Context is typically created by Core bootstrap and retrieved using dependency injection, extensions usually do not need to create own instances.

There are also not many routing aspects with context dependencies that may use the interface or the trait. If so, they can adapt easily and stay compatible with older versions.

Migration

The constructor of the Context class was bogus. Since the class is an injectable singleton that should be available through the container, it must not have manual constructor arguments since this would shut down the container registration. Extensions typically did not create own instances of Context, using the constructor argument was - if at all - only done in tests. Unit tests should typically create own instances using new and hand them over to classes that get the context injected.

Adaption to the interface and trait removal is straight forward as well: Get the context injected into the aspect, or retrieve the instance using GeneralUtility::makeInstance().