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Context API and Aspects¶

Introduction¶

Context API encapsulates various information for data retrieval (e.g. inside the database) and analysis of current permissions and caching information.

Previously, various information was distributed inside globally accessible objects ($TSFE or $BE_USER) like the current workspace ID or if a frontend or backend user is authenticated. Having a global object available was also dependent on the current request type (frontend or backend), instead of having one consistent place where all this data is located.

The context is instantiated at the very beginning of each TYPO3 entry point, keeping track of the current time (formally known as $GLOBALS['EXEC_TIME'], if a user is logged in, and which workspace is currently accessed.

This information is separated in so-called "Aspects", each being responsible for a certain area:

DateTime Aspect¶

Contains time, date and timezone information for the current request.

In comparison to known behaviour until TYPO3 v9, DateTimeAspect replaces for example $GLOBALS['SIM_EXEC_TIME'] and $GLOBALS['EXEC_TIME'].

The DateTime Aspect accepts following properties:

Property	Call	Result
`timestamp`	`$context->getPropertyFromAspect('date', 'timestamp');`	unix timestamp as integer value
`timezone`	`$context->getPropertyFromAspect('date', 'timezone');`	timezone name, e.g. `Germany/Berlin`
`iso`	`$context->getPropertyFromAspect('date', 'iso');`	datetime as string in ISO 8601 format, e.g. `2004-02-12T15:19:21+00:00`
`full`	`$context->getPropertyFromAspect('date', 'full');`	the complete DateTimeImmutable object

Example¶

$context = GeneralUtility::makeInstance(Context::class);

// Reading the current data instead of $GLOBALS['EXEC_TIME']
$currentTimestamp = $context->getPropertyFromAspect('date', 'timestamp');

Language Aspect¶

Contains information about language settings for the current request, including fallback and overlay logic.

In comparison to known behaviour until TYPO3 v9, LanguageAspect replaces various properties related to language Id, overlay and fallback logic, mostly within Frontend.

The Language Aspect accepts following properties:

Property	Call	Result
`id`	`$context->getPropertyFromAspect('language', 'id');`	the requested language of the current page as integer (uid)
`contentId`	`$context->getPropertyFromAspect('language', 'contentId');`	the language id of records to be fetched in translation scenarios as integer (uid)
`fallbackChain`	`$context->getPropertyFromAspect('language', 'fallbackChain');`	the fallback steps as array
`overlayType`	`$context->getPropertyFromAspect('language', 'overlayType');`	one of `LanguageAspect::OVERLAYS_OFF`, `LanguageAspect::OVERLAYS_MIXED`, `LanguageAspect::OVERLAYS_ON`, or `LanguageAspect::OVERLAYS_ON_WITH_FLOATING` (default)
`legacyLanguageMode`	`$context->getPropertyFromAspect('language', 'legacyLanguageMode');`	one of `strict`, `ignore` or `content_fallback`, kept for compatibility reasons. Don't use if not really necessary, the option will be removed rather sooner than later.
`legacyOverlayType`	`$context->getPropertyFromAspect('language', 'legacyOverlayType');`	one of `hideNonTranslated`, `0` or `1`, kept for compatibility reasons. Don't use if not really necessary, the option will be removed rather sooner than later.

Overlay types:

legacy settings sys_language_overlay documented in TypoScript Reference.

LanguageAspect::OVERLAYS_OFF:
Just fetch records from the selected language as given by $GLOBALS['TSFE']->sys_language_content. No overlay will happen, no fetching of the records from the default language. This boils down to "free mode" language handling. Records without a default language parent are included.
LanguageAspect::OVERLAYS_MIXED:
Fetch records from the default language and overlay them with translations. If a record is not translated, the default language will be used.
LanguageAspect::OVERLAYS_ON:
Fetch records from the default language and overlay them with translations. If a record is not translated, it will not be displayed.
LanguageAspect::OVERLAYS_ON_WITH_FLOATING:
Fetch records from the default language and overlay them with translations. If a record is not translated, it will not be shown. Records without a default language parent are included.

Replaced calls:

$TSFE->sys_language_uid -> id
$TSFE->sys_language_content -> contentId
$TSFE->sys_language_mode -> fallbackChain
$TSFE->sys_language_mode -> legacyLanguageMode
$TSFE->sys_language_contentOL -> legacyOverlayType

Example¶

$context = GeneralUtility::makeInstance(Context::class);

// Reading the current fallback chain instead $TSFE->sys_language_mode
$fallbackChain = $context->getPropertyFromAspect('language', 'fallbackChain');

User Aspect¶

Contains information about authenticated users in the current request. Can be used for frontend and backend users.

In comparison to known behaviour until TYPO3 v9, UserAspect replaces various calls and checks on $GLOBALS['BE_USER'] and $GLOBALS['TSFE']->fe_user options when only some information is needed.

The User Aspect accepts following properties:

Property	Call	Result
`id`	`$context->getPropertyFromAspect('backend.user', 'id');`	uid of the currently logged in user, 0 if no user
`username`	`$context->getPropertyFromAspect('backend.user', 'username');`	the username of the currently authenticated user. Empty string if no user.
`isLoggedIn`	`$context->getPropertyFromAspect('frontend.user', 'isLoggedIn');`	whether a user is logged in, as boolean.
`isAdmin`	`$context->getPropertyFromAspect('backend.user', 'isAdmin');`	whether the user is admin, as boolean. Only useful for BEuser.
`groupIds`	`$context->getPropertyFromAspect('backend.user', 'groupIds');`	the groups the user is a member of, as array
`groupNames`	`$context->getPropertyFromAspect('frontend.user', 'groupNames');`	the names of all groups the user belongs to, as array

Example¶

$context = GeneralUtility::makeInstance(Context::class);

// Checking if a user is logged in
$userIsLoggedIn = $context->getPropertyFromAspect('frontend.user', 'isLoggedIn');

Visibility Aspect¶

The aspect contains whether to show hidden pages, records (content) or even deleted records.

In comparison to known behaviour until TYPO3 v9, VisibilityAspect replaces for example $GLOBALS['TSFE']->showHiddenPages and $GLOBALS['TSFE']->showHiddenRecords.

The Visibility Aspect accepts following properties:

Property	Call	Result
`includeHiddenPages`	`$context->getPropertyFromAspect('visibility', 'includeHiddenPages');`	whether hidden pages should be displayed, as boolean
`includeHiddenContent`	`$context->getPropertyFromAspect('visibility', 'includeHiddenContent');`	whether hidden content should be displayed, as boolean
`includeDeletedRecords`	`$context->getPropertyFromAspect('visibility', 'includeDeletedRecords');`	whether deleted records should be displayed, as boolean.

Example¶

$context = GeneralUtility::makeInstance(Context::class);

// Checking if hidden pages should be displayed
$showHiddenPages = $context->getPropertyFromAspect('visibility', 'includeHiddenPages');

Workspace Aspect¶

The aspect contains information about the currently accessed workspace

In comparison to known behaviour until TYPO3 v9, WorkspaceAspect replaces e.g. $GLOBALS['BE_USER']->workspace.

The Workspace Aspect accepts following properties:

Property	Call	Result
`id`	`$context->getPropertyFromAspect('workspace', 'id');`	UID of the currently accessed workspace as integer
`isLive`	`$context->getPropertyFromAspect('workspace', 'isLive');`	whether the current workspace is live, or a custom offline WS, as boolean
`isOffline`	`$context->getPropertyFromAspect('workspace', 'isOffline');`	whether the current workspace is offline, as boolean.

Example¶

$context = GeneralUtility::makeInstance(Context::class);

// Retrieving the uid of currently accessed workspace
$workspaceId = $context->getPropertyFromAspect('workspace', 'id');