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ClientHintsLookupResults.php
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ClientHintsLookupResults.php
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<?php
namespace MediaWiki\CheckUser\ClientHints;
use InvalidArgumentException;
use MediaWiki\CheckUser\Services\UserAgentClientHintsManager;
/**
* Value object for the result of UserAgentClientHintsLookup::getClientHintsByReferenceIds
* which contains reference IDs to ClientHintsData objects.
*
* This is used, instead of a two-dimensional list, to enforce that
* the map IDs are valid. This class stores the data as a two-dimensional
* list.
*/
class ClientHintsLookupResults {
/** @var int[][] */
private array $referenceIdsToClientHintsDataIndex;
/** @var ClientHintsData[] */
private array $clientHintsDataObjects;
/**
* @param int[][] $referenceIdsToClientHintsDataIndex A map of reference type and reference ID values
* to integer keys in $clientHintsDataObjects array.
* @param ClientHintsData[] $clientHintsDataObjects An array of ClientHintsData objects where the keys are
* integers that are the second-dimension value in the first parameter.
*/
public function __construct( array $referenceIdsToClientHintsDataIndex, array $clientHintsDataObjects ) {
$this->referenceIdsToClientHintsDataIndex = $referenceIdsToClientHintsDataIndex;
$this->clientHintsDataObjects = $clientHintsDataObjects;
}
/**
* Get unique ClientHintsData objects and the number of times they were used for a
* array of reference IDs.
*
* @param ClientHintsReferenceIds|null $referenceIds The reference IDs to get the objects for.
* Null for all reference IDs.
* @return array[] An array of two arrays. The first array has keys corresponding to a key in the second array and
* the value is the number of rows the ClientHintsData object is associated with. The second array has values
* of unique ClientHintsData objects.
*/
public function getGroupedClientHintsDataForReferenceIds( ?ClientHintsReferenceIds $referenceIds ): array {
// Store the keys to the ClientHintsData objects in $this->clientHintsDataObjects
// as values in the array $clientHintsDataObjectKeys that are associated with
// the reference IDs provided in the first parameter to this method.
$clientHintsDataObjectKeys = [];
foreach ( $this->referenceIdsToClientHintsDataIndex as $referenceType => $referenceIdsForReferenceType ) {
if ( $referenceIds ) {
// If filtering for specific reference IDs, filter so that only the reference IDs that
// were requested are used for the grouping and counting operations later in this method.
$clientHintsDataObjectKeys = array_merge( $clientHintsDataObjectKeys, array_values( array_intersect_key(
$referenceIdsForReferenceType,
array_flip( $referenceIds->getReferenceIds( $referenceType ) ),
) ) );
} else {
// If the $referenceIds parameter was null, then this means apply no filtering to the reference
// IDs that are used.
$clientHintsDataObjectKeys = array_merge(
$clientHintsDataObjectKeys,
array_values( $referenceIdsForReferenceType )
);
}
}
// Count the number of occurrences for each integer in the $clientHintsDataObjectKeys
// array. This counts how many occurrences of a given unique ClientHintsData object
// are present for the reference IDs in $referenceIds.
$groupedClientHintsIds = array_count_values( $clientHintsDataObjectKeys );
// Create an array of ClientHintsData objects where the keys
// are the key for this object in $this->clientHintsDataObjects.
// This array will contain the subset of $this->clientHintsDataObjects
// where each key is present in $groupedClientHintsIds.
$clientHintsDataObjects = [];
foreach ( array_keys( $groupedClientHintsIds ) as $clientHintsId ) {
if ( array_key_exists( $clientHintsId, $this->clientHintsDataObjects ) ) {
// Add the ClientHintsData object into the return array.
$clientHintsDataObjects[$clientHintsId] = $this->clientHintsDataObjects[$clientHintsId];
} else {
// If, for some reason, there is no ClientHintsData object in
// $this->clientHintsDataObjects, then just silently ignore
// and remove the group from the return list.
unset( $groupedClientHintsIds[$clientHintsId] );
}
}
return [ $groupedClientHintsIds, $clientHintsDataObjects ];
}
/**
* Get the ClientHintsData object for a given reference ID and reference type.
*
* @param int $referenceId The reference ID
* @param int $referenceType The reference type (one of the UserAgentClientHintsManager::IDENTIFIER_* integer
* constants).
* @return ClientHintsData|null
*/
public function getClientHintsDataForReferenceId( int $referenceId, int $referenceType ): ?ClientHintsData {
// Validate that the $referenceType given is a valid reference type. If not, then
// return an exception to indicate a problem in the code.
if ( !array_key_exists( $referenceType, UserAgentClientHintsManager::IDENTIFIER_TO_TABLE_NAME_MAP ) ) {
throw new InvalidArgumentException( "Unrecognised reference type '$referenceType'" );
}
// Check that the reference IDs to ClientHintsData object index ID map has an
// entry for this reference ID and reference type. Otherwise, return null.
// If it does then also check that the index in the ClientHintsData objects array
// exists. Otherwise, return null.
if (
!array_key_exists( $referenceType, $this->referenceIdsToClientHintsDataIndex ) ||
!array_key_exists( $referenceId, $this->referenceIdsToClientHintsDataIndex[$referenceType] ) ||
!array_key_exists(
$this->referenceIdsToClientHintsDataIndex[$referenceType][$referenceId],
$this->clientHintsDataObjects
)
) {
return null;
}
// The reference ID matches a ClientHintsData object, so return it.
return $this->clientHintsDataObjects[$this->referenceIdsToClientHintsDataIndex[$referenceType][$referenceId]];
}
/**
* Allows UserAgentClientHintsFormatter to get the raw data
* for UserAgentClientHintsFormatter::batchFormatClientHintsData.
*
* @internal For use by UserAgentClientHintsFormatter only.
* @return array[]
*/
public function getRawData(): array {
return [ $this->referenceIdsToClientHintsDataIndex, $this->clientHintsDataObjects ];
}
}

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ClientHintsLookupResults.php (5 KB)

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