populateCheckUserTablesWithSimulatedData.php
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populateCheckUserTablesWithSimulatedData.php
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	<?php

	namespace MediaWiki\CheckUser\Maintenance;

	use MailAddress;
	use ManualLogEntry;
	use MediaWiki\Auth\AuthenticationResponse;
	use MediaWiki\Auth\AuthManager;
	use MediaWiki\CheckUser\ClientHints\ClientHintsData;
	use MediaWiki\CheckUser\HookHandler\CheckUserPrivateEventsHandler;
	use MediaWiki\CheckUser\HookHandler\RecentChangeSaveHandler;
	use MediaWiki\CheckUser\Services\UserAgentClientHintsManager;
	use MediaWiki\Content\ContentHandler;
	use MediaWiki\Context\RequestContext;
	use MediaWiki\Maintenance\Maintenance;
	use MediaWiki\Request\FauxRequest;
	use MediaWiki\Title\Title;
	use MediaWiki\User\User;
	use MediaWiki\User\UserIdentity;
	use MediaWiki\User\UserIdentityValue;
	use MediaWiki\User\UserRigorOptions;
	use Wikimedia\IPUtils;
	use Wikimedia\Timestamp\ConvertibleTimestamp;

	$IP = getenv( 'MW_INSTALL_PATH' );
	if ( $IP === false ) {
	$IP = __DIR__ . '/../../..';
	}
	require_once "$IP/maintenance/Maintenance.php";

	/**
	* Populates the CheckUser tables with simulated data that can be useful for
	* testing.
	*
	* WARNING: This should never be run on production wikis. This is intended only for
	* local testing wikis where the DB can be cleared without issue.
	*/
	class PopulateCheckUserTablesWithSimulatedData extends Maintenance {

	private const VALID_LOG_EVENTS = [
	'move' => [ 'move', 'move_redir' ],
	'delete' => [ 'delete', 'restore' ],
	'suppress' => [ 'delete' ],
	'merge' => [ 'merge' ]
	];

	/** @var array<string,?ClientHintsData> */
	private array $userAgentsToClientHintsMap;

	private RecentChangeSaveHandler $recentChangeSaveHandler;
	private CheckUserPrivateEventsHandler $privateEventsHandler;

	private User $userToEmailAndSendPasswordResetsFor;

	private ?ClientHintsData $currentClientHintsData;

	private array $ipv4Ranges = [];

	private array $ipv6Ranges = [];

	private array $ipsToUse;

	private FauxRequest $mainRequest;

	public function __construct() {
	parent::__construct();
	$this->addDescription( 'If you use --num-temp with this script, set ' .
	'$wgTempAccountNameAcquisitionThrottle to null to avoid rate limiting on ' .
	'temporary account name acquisitions' );
	$this->addOption(
	'num-users',
	'How many users should be created and used for the simulated actions. ' .
	'The number of actions performed will roughly be split equally between the users. Default is 10.',
	false,
	true
	);
	$this->addOption(
	'num-anon',
	'How many IPs should be used for the simulated actions. ' .
	'The number of actions performed will roughly be split equally between the IPs. Default is 5.',
	false,
	true
	);
	$this->addOption(
	'num-temp',
	'How many temporary accounts should be used for the simulated actions. ' .
	'The number of actions performed will roughly be split equally between the temporary accounts.' .
	'This is ignored if temporary account creation is disabled. If not ignored, the default is 10.',
	false,
	true
	);
	$this->addOption(
	'num-used-ips',
	'How many IPs to select from the ranges in ranges-for-ips. Must not be smaller than num-anon. ' .
	'These IPs will be used for anon edits, temporary account and user actions. These will also be used ' .
	'in the XFF header (if set) for actions. Default is 5.',
	false,
	true
	);
	$this->addOption(
	'ranges-for-ips',
	'What ranges should the IPs be selected from. Default is one IPv4 and IPv6 range inside ' .
	'ranges defined as internal.',
	false, true, false, true
	);
	$this->addArg(
	'count',
	'How many items to be added to the CheckUser tables. Default is 1,000 items.',
	false
	);

	$this->requireExtension( 'CheckUser' );
	}

	public function execute() {
	// Check development mode is enabled
	if ( $this->getConfig()->get( 'CheckUserDeveloperMode' ) !== true ) {
	$this->fatalError(
	"CheckUser development mode must be enabled to use this script. To do this, set " .
	"wgCheckUserDeveloperMode to true. Only do this on localhost testing wikis."
	);
	}
	// Set-up and argument parsing.
	$count = $this->ensureArgumentIsInt(
	$this->getArg( 0, 1000 ),
	'Count'
	);
	$numUsers = $this->ensureArgumentIsInt(
	$this->getOption( 'num-users', 10 ),
	'Number of registered users'
	);
	$numAnon = $this->ensureArgumentIsInt(
	$this->getOption( 'num-anon', 5 ),
	'Number of anonymous users'
	);
	$numTemp = $this->ensureArgumentIsInt(
	$this->getOption( 'num-temp', 10 ),
	'Number of temporary users'
	);
	$numIpsToUse = $this->ensureArgumentIsInt(
	$this->getOption( 'num-used-ips', 5 ),
	'Number of IPs to use'
	);
	$ipRanges = $this->getOption( 'ranges-for-ips', [ '127.0.0.1/24', 'fd12:3456:789a:1::/40' ] );

	foreach ( $ipRanges as $range ) {
	if ( !IPUtils::isValidRange( $range ) ) {
	$this->fatalError( 'range-for-ips option must be a valid IP address range.' );
	}
	if ( IPUtils::isIPv4( $range ) ) {
	$this->ipv4Ranges[] = $range;
	} else {
	$this->ipv6Ranges[] = $range;
	}
	}

	if ( $numAnon > $numIpsToUse ) {
	$this->fatalError( 'Number of anon users making edits should not exceed the number of IPs used.' );
	}

	$services = $this->getServiceContainer();
	if ( !$services->getTempUserConfig()->isEnabled() ) {
	// Only add temporary users if temporary user creation is enabled.
	$numTemp = 0;
	}

	$actionsPerActor = intval( floor( $count / array_sum( [ $numUsers, $numAnon, $numTemp ] ) ) );
	$remainderActions = $count % array_sum( [ $numUsers, $numAnon, $numTemp ] );

	if ( $actionsPerActor < 5 ) {
	$minCount = array_sum( [ $numUsers, $numAnon, $numTemp ] ) * 5;
	$this->fatalError(
	"Minimum actions per actor must be 5. Increase the 'count' argument to at least {$minCount}."
	);
	}

	// Start code that can assume it is safe to perform un-reversible testing actions.
	$this->privateEventsHandler = new CheckUserPrivateEventsHandler(
	$services->get( 'CheckUserInsert' ),
	$this->getConfig(),
	$services->getUserIdentityLookup(),
	$services->getUserFactory(),
	$services->getReadOnlyMode()
	);
	$this->recentChangeSaveHandler = new RecentChangeSaveHandler(
	$services->get( 'CheckUserInsert' ),
	$services->getJobQueueGroup(),
	$services->getConnectionProvider()
	);
	$userForEmails = $this->createRegisteredUser();
	if ( $userForEmails === null ) {
	$this->fatalError(
	"Unable to create a new user to be used as the target for emails and password resets.\n"
	);
	}
	$this->userToEmailAndSendPasswordResetsFor = $userForEmails;
	$this->mainRequest = new FauxRequest();
	RequestContext::getMain()->setRequest( $this->mainRequest );
	$this->initUserAgentAndClientHintsCombos();

	// Get $numIpsToUse IPs.
	$this->ipsToUse = [];
	// First try to get one random IPv4 in the allowed IPv4 range(s).
	if ( count( $this->ipv4Ranges ) ) {
	$this->ipsToUse[] = $this->generateNewIPv4();
	$numIpsToUse--;
	}
	// Next try to get one random IPv6 in the allowed IPv6 range(s).
	if ( count( $this->ipv6Ranges ) && $numIpsToUse > 0 ) {
	$this->ipsToUse[] = $this->generateNewIPv6();
	$numIpsToUse--;
	}
	// If IPs can still be chosen then randomly generate
	// them from either IPv4 or IPv6 ranges.
	if ( $numIpsToUse > 0 ) {
	foreach ( range( 0, $numIpsToUse ) as $ignored ) {
	$this->ipsToUse[] = $this->generateNewIp();
	}
	}

	// Get the first IP, user agent and client hints data
	$this->getNewIp();
	$this->getNewUserAgentAndAssociatedClientHints();

	// First populate using users
	for ( $i = 0; $i < $numUsers; $i++ ) {
	$actionsLeft = $actionsPerActor;
	$this->applyRemainderAction( $actionsLeft, $remainderActions );

	// Find a username that is not already being used
	$this->setNewRandomFakeTime();
	$lowerLimit = time() - ConvertibleTimestamp::time();
	$user = $this->createRegisteredUser();
	// Creating an account causes a log event.
	$actionsLeft--;
	if ( $user === null ) {
	$this->output( "Unable to create new user. Skipping this actor.\n" );
	continue;
	}
	$this->output( "Processing user with username {$user->getName()}.\n" );

	while ( $actionsLeft > 0 ) {
	if ( $this->getRandomFloat() < 0.3 ) {
	// Assign a new IP to the main request 30% of the time.
	$this->getNewIp();
	}

	$actionsLeft -= $this->performInsertBatch( $user, $actionsLeft, $lowerLimit );
	}
	}

	// Secondly populate using temporary accounts
	for ( $i = 0; $i < $numTemp; $i++ ) {
	$actionsLeft = $actionsPerActor;
	$this->applyRemainderAction( $actionsLeft, $remainderActions );

	$this->setNewRandomFakeTime();
	$lowerLimit = time() - ConvertibleTimestamp::time();
	$user = $services->getTempUserCreator()->create(
	null, $this->mainRequest
	)->getUser();
	// Creating a temporary user creates a log event.
	$actionsLeft--;
	$this->output( "Processing temporary user with username {$user->getName()}.\n" );

	while ( $actionsLeft > 0 ) {
	if ( $this->getRandomFloat() < 0.3 ) {
	// Assign a new IP to the main request 30% of the time.
	$this->getNewIp();
	}

	$actionsLeft -= $this->performInsertBatch( $user, $actionsLeft, $lowerLimit );
	}
	}

	// Lastly populate using IPs
	if ( count( $this->ipsToUse ) < 3 ) {
	// If less than 3 IPs to choose from, keep the original ordering.
	$ipsInOrder = $this->ipsToUse;
	} else {
	// If three or more IPs to choose from, pick the first two and a random
	// selection of the other IPs. This ensures at least one IPv4 and IPv6
	// address is used if allowed.
	$ipsInOrder = array_slice( $this->ipsToUse, 2 );
	shuffle( $ipsInOrder );
	array_unshift( $ipsInOrder, $this->ipsToUse[0], $this->ipsToUse[1] );
	}
	for ( $i = 0; $i < $numAnon; $i++ ) {
	$actionsLeft = $actionsPerActor;
	$this->applyRemainderAction( $actionsLeft, $remainderActions );

	$user = UserIdentityValue::newAnonymous( IPUtils::prettifyIP( $ipsInOrder[$i] ) );
	// Assign the request IP as the anon user being used for this loop.
	RequestContext::getMain()->getRequest()->setIP( $user->getName() );
	$this->output( "Processing anon user with IP {$user->getName()}.\n" );

	while ( $actionsLeft > 0 ) {
	$this->randomlyAssignXFFHeader( $user->getName() );
	$actionsLeft -= $this->performInsertBatch( $user, $actionsLeft );
	}
	}
	}

	/**
	* Ensure an argument provided via the command line is an integer.
	* If it is not, then exit the script with a fatal error message.
	*
	* @param mixed $argument The argument from the command line (usually in string form)
	* @param string $name The name of the argument used if the argument is not an integer
	* in the fatal error message.
	* @return int The argument as an integer (exit is called if the argument was invalid).
	*/
	private function ensureArgumentIsInt( $argument, string $name ): int {
	if ( ( !$argument \|\| !intval( $argument ) ) && $argument !== '0' ) {
	$this->fatalError( "$name must be an integer" );
	}

	return intval( $argument );
	}

	/**
	* Reduce the remainder argument by 1 and increase the actions left
	* argument by 1, as long as the remainder argument is above 0.
	*
	* @param int &$actionsLeft The actions left for an actor
	* @param int &$remainderActions The remainder of the floor division
	* @return void
	*/
	private function applyRemainderAction( int &$actionsLeft, int &$remainderActions ) {
	if ( $remainderActions > 0 ) {
	$actionsLeft += 1;
	$remainderActions -= 1;
	}
	}

	/**
	* Create a user on the wiki with a username
	* prefixed with CheckUserSimulated and then
	* a random string of hexadecimal characters.
	*
	* @return ?User A user that has just been created or null if this failed.
	*/
	private function createRegisteredUser(): ?User {
	$services = $this->getServiceContainer();
	// Find a username that doesn't exist.
	$attemptsMade = 0;
	do {
	$user = $services->getUserFactory()->newFromName(
	$this->getPrefix() . wfRandomString(), UserRigorOptions::RIGOR_CREATABLE
	);
	if ( $attemptsMade > 100 ) {
	return null;
	}
	$attemptsMade++;
	} while ( $user === null \|\| $user->isRegistered() );
	'@phan-var User $user';
	// Create an account using this username
	$services->getAuthManager()->autoCreateUser(
	$user,
	AuthManager::AUTOCREATE_SOURCE_MAINT,
	false
	);
	return $user;
	}

	/**
	* Calls wfRandom and returns the value.
	*
	* Called by other code in this class so that tests
	* can mock the return value.
	*
	* @return float A float in the range [0, 1]
	*/
	protected function getRandomFloat(): float {
	return floatval( wfRandom() );
	}

	/**
	* Calls mt_rand and returns the value.
	*
	* Called by code in this class so that tests
	* can mock the return value to test behaviour
	* that is determined randomly using mt_rand.
	*
	* @param int $min See mt_rand documentation
	* @param int $max See mt_rand documentation
	* @return int A random integer, see mt_rand documentation for more details.
	*/
	protected function mtRand( $min, $max ): int {
	return mt_rand( $min, $max );
	}

	/**
	* This method 30% of the time will apply a XFF header to the request
	* and in other cases will clear any existing XFF header.
	*
	* @todo Make the XFF IPs make a bit more sense than using random IPs and/or
	* make some of the XFF strings trusted.
	*
	* @param string $currentIp The current IP address of the request that will not
	* be used in the XFF header.
	*/
	private function randomlyAssignXFFHeader( string $currentIp ): void {
	if ( $this->getRandomFloat() < 0.3 ) {
	$xffIp = $this->returnRandomIpExceptExcluded( [ $currentIp ] );
	if ( !$xffIp ) {
	$xffValue = false;
	} else {
	$xffValue = IPUtils::prettifyIP( $xffIp );
	if ( $this->getRandomFloat() < 0.7 ) {
	$xffIp = $this->returnRandomIpExceptExcluded( [ $currentIp, $xffIp ] );
	if ( $xffIp ) {
	$xffValue = $xffValue . ', ' . IPUtils::prettifyIP( $xffIp );
	}
	}
	}
	} else {
	$xffValue = false;
	}
	$this->mainRequest->setHeaders( [ 'X-Forwarded-For' => $xffValue ] );
	}

	/**
	* Return a random IP address from the list of IPs chosen
	* in the property self::ipsToUse excluding those provided
	* in the arguments.
	*
	* @param array $ipsExcluded The IPs to exclude from the random selection
	* @return string\|null A random IP or null if no IPs are left after the exclusion step.
	*/
	private function returnRandomIpExceptExcluded( array $ipsExcluded ): ?string {
	$ipsToChoose = array_flip( array_filter(
	$this->ipsToUse,
	static function ( $item ) use ( $ipsExcluded ) {
	return !in_array( $item, $ipsExcluded );
	}
	) );
	if ( count( $ipsToChoose ) ) {
	return array_rand( $ipsToChoose );
	}
	return null;
	}

	/**
	* Randomly pick either an IPv4 or IPv6 address
	* from the list of IPs that were already chosen randomly.
	* Also assign the IP as the IP used in the main request.
	*
	* @return string The IP that was chosen
	*/
	private function getNewIp(): string {
	$ip = array_rand( array_flip( $this->ipsToUse ) );
	$this->randomlyAssignXFFHeader( $ip );
	RequestContext::getMain()->getRequest()->setIP( $ip );
	return $ip;
	}

	/**
	* Generate a randomly chosen IPv4 or IPv6 address that sits within the allowed ranges.
	* If the set of allowed ranges contain both IPv4 and IPv6 ranges, an IPv4 address is returned
	* 50% of the time on average.
	*
	* @return string
	*/
	private function generateNewIp(): string {
	if ( count( $this->ipv4Ranges ) === 0 ) {
	return $this->generateNewIPv6();
	}

	if ( count( $this->ipv6Ranges ) === 0 ) {
	return $this->generateNewIPv4();
	}

	if ( $this->getRandomFloat() < 0.5 ) {
	return $this->generateNewIPv4();
	} else {
	return $this->generateNewIPv6();
	}
	}

	/**
	* Randomly pick a new IPv4 address that comes from
	* one of the defined ranges.
	*
	* @return string The IP that was chosen
	*/
	private function generateNewIPv4(): string {
	[ $start, $end ] = IPUtils::parseRange( array_rand( array_flip( $this->ipv4Ranges ) ) );
	$start = ip2long( IPUtils::formatHex( $start ) );
	$end = ip2long( IPUtils::formatHex( $end ) );
	$ipAsLong = $this->mtRand( $start, $end );
	$ip = long2ip( $ipAsLong );
	return $ip;
	}

	/**
	* Randomly pick a new IPv6 address that comes
	* from one of the defined IPv6 ranges.
	*
	* @return string The IP that was chosen
	*/
	private function generateNewIPv6(): string {
	[ $start, $end ] = IPUtils::parseRange( array_rand( array_flip( $this->ipv6Ranges ) ) );
	$ip = '';
	$seenDifference = false;
	$lastOnEdgeOfRange = false;
	for ( $i = 0; $i < strlen( $start ); $i++ ) {
	if ( !$seenDifference && $start[$i] === $end[$i] ) {
	// Same character in both end and start of range
	// therefore the randomly selected IPv6 must have
	// this character
	$ip .= $start[$i];
	} elseif ( !$seenDifference ) {
	// Not the same character, but this is the first difference
	// seen in the characters between $start and $end so far.
	//
	// Choose a random hex character between the hex characters in
	// $start and $end.
	$startAtiAsDec = hexdec( $start[$i] );
	$endAtiAsDec = hexdec( $end[$i] );
	$newHexCharacter = dechex( $this->mtRand( $startAtiAsDec, $endAtiAsDec ) );
	$ip .= $newHexCharacter;
	$seenDifference = true;
	// If the randomly selected hex character is the same as the
	// start of the end character, then the next hex character
	// must be greater than or less than respectively than
	// the character at $i.
	if ( $newHexCharacter == $start[$i] ) {
	$lastOnEdgeOfRange = 'start';
	} elseif ( $newHexCharacter == $end[$i] ) {
	$lastOnEdgeOfRange = 'end';
	}
	} elseif ( $lastOnEdgeOfRange === 'start' ) {
	// Ensure the random selection never exceeds the value
	// at $start[$i]. This is to prevent the IP being outside the range.
	$startAtiAsDec = hexdec( $start[$i] );
	$newHexCharacter = dechex( $this->mtRand( $startAtiAsDec, 15 ) );
	$ip .= $newHexCharacter;
	if ( $newHexCharacter !== $start[$i] ) {
	$lastOnEdgeOfRange = false;
	}
	} elseif ( $lastOnEdgeOfRange === 'end' ) {
	// Ensure the random selection never exceeds the value
	// at $end[$i]. This is to prevent the IP being outside the range.
	$endAtiAsDec = hexdec( $end[$i] );
	$newHexCharacter = dechex( $this->mtRand( 0, $endAtiAsDec ) );
	$ip .= $newHexCharacter;
	if ( $newHexCharacter !== $end[$i] ) {
	$lastOnEdgeOfRange = false;
	}
	} else {
	// Randomly choose any hex character.
	$ip .= dechex( $this->mtRand( 0, 15 ) );
	}
	}
	$ip = IPUtils::formatHex( $ip );
	return $ip;
	}

	/**
	* This method randomly chooses a User-Agent header string, assigns that
	* to the request and then applies Client Hints headers if the browser
	* that uses the selected User-Agent supports Client Hints.
	*
	* @return void
	*/
	private function getNewUserAgentAndAssociatedClientHints(): void {
	$userAgent = array_rand( $this->userAgentsToClientHintsMap );
	$this->mainRequest->setHeader( 'User-Agent', $userAgent );
	/** @var ?ClientHintsData $clientHintsData */
	$clientHintsData = $this->userAgentsToClientHintsMap[$userAgent];
	// Unset any existing Client Hints data.
	$clientHintHeadersToUnset = array_filter(
	array_keys( $this->mainRequest->getAllHeaders() ),
	static fn ( $headerName ) => str_starts_with( $headerName, 'SEC-CH-UA' )
	);
	foreach ( $clientHintHeadersToUnset as $clientHintHeader ) {
	$this->mainRequest->setHeaders( [ $clientHintHeader => false ] );
	}
	if ( $clientHintsData !== null ) {
	// Set the Client Hints headers in the faux request.
	$clientHintHeadersToSet = array_filter( array_keys(
	$this->getConfig()->get( 'CheckUserClientHintsHeaders' )
	) );
	foreach ( $clientHintHeadersToSet as $clientHintHeader ) {
	$propertyName = ClientHintsData::HEADER_TO_CLIENT_HINTS_DATA_PROPERTY_NAME[$clientHintHeader];
	$this->mainRequest->setHeader(
	$clientHintHeader, $clientHintsData->jsonSerialize()[$propertyName]
	);
	}
	}
	$this->currentClientHintsData = $clientHintsData;
	}

	/**
	* Perform a insert batch for a given actor. The inserts will stop and the method
	* will return early if the actions performed reaches $actionsLeft.
	*
	* This method inserts edits by actually performing the edit. It uses ManualLogEntry
	* to create log entries that are visible in Special:Log. Other log events, such as
	* logging in, which are not shown in Special:Log are created by calling the
	* specified hook handler.
	*
	* @param UserIdentity $actor The user/IP/temporary account that will perform these actions
	* @param int &$actionsLeft Must be greater than 0. Represents the number of actions left.
	* @param ?int $lowerLimit The furthest ago the random fake time can be from the current time in seconds.
	* @return int The actions actually performed in this batch.
	*/
	private function performInsertBatch( UserIdentity $actor, int &$actionsLeft, ?int $lowerLimit = null ): int {
	$this->setNewRandomFakeTime( $lowerLimit );
	if ( $this->getRandomFloat() < 0.3 ) {
	// Assign a new user agent and client hints combo 30% of the time
	$this->getNewUserAgentAndAssociatedClientHints();
	}
	$services = $this->getServiceContainer();
	/** @var UserAgentClientHintsManager $userAgentClientHintsManager */
	$userAgentClientHintsManager = $services->getService( 'UserAgentClientHintsManager' );
	$actorAsUserObject = $services->getUserFactory()->newFromUserIdentity( $actor );
	$actionsPerformed = 0;
	// Simulate a failed login 10% of the time.
	if ( $actor->isRegistered() && $this->getRandomFloat() < 0.1 ) {
	$failReasons = [];
	// Simulate good password 30% of the time.
	if ( $this->getRandomFloat() < 0.3 ) {
	$failReasons[] = "good password";
	// The phrase "locked" comes from the CentralAuth extension and indicates that
	// the account login was made on an account that was locked but the request
	// otherwise used the correct password.
	$failReasons[] = "locked";
	} else {
	$failReasons[] = "bad password";
	}
	$this->privateEventsHandler->onAuthManagerLoginAuthenticateAudit(
	AuthenticationResponse::newFail( wfMessage( 'test' ), $failReasons ),
	$actorAsUserObject,
	$actor->getName(),
	[]
	);
	if ( !$this->incrementAndCheck( $actionsPerformed, $actionsLeft ) ) {
	return $actionsPerformed;
	}
	}
	if ( $actor->isRegistered() ) {
	// Simulate a login.
	$this->privateEventsHandler->onAuthManagerLoginAuthenticateAudit(
	AuthenticationResponse::newPass( $actor->getName() ),
	$actorAsUserObject,
	$actor->getName(),
	[]
	);
	if ( !$this->incrementAndCheck( $actionsPerformed, $actionsLeft ) ) {
	return $actionsPerformed;
	}
	}
	// Perform a random number of edits, capped at 3.
	$editsToPerform = intval( $this->getRandomFloat() * 3 );
	if ( !$actor->isRegistered() ) {
	// Always perform at least one edit if an anon user.
	$editsToPerform += 1;
	}
	foreach ( range( 0, $editsToPerform ) as $ignored ) {
	$title = null;
	if ( $this->getRandomFloat() < 0.3 ) {
	$title = Title::newFromText( $this->getPrefix() . 'Existing page' );
	}
	$revisionId = $this->performEdit( $actorAsUserObject, $title );
	// Send a REST API request for the edit with Client Hints data, if there is data specified.
	if ( $this->currentClientHintsData !== null && $revisionId !== null ) {
	$userAgentClientHintsManager->insertClientHintValues(
	ClientHintsData::newFromJsApi( $this->currentClientHintsData->jsonSerialize() ),
	$revisionId,
	'revision'
	);
	}
	if ( !$this->incrementAndCheck( $actionsPerformed, $actionsLeft ) ) {
	return $actionsPerformed;
	}
	}
	// Simulate a random number of log actions, capped at 2.
	$logsToPerform = intval( $this->getRandomFloat() * 2 );
	foreach ( range( 0, $logsToPerform ) as $ignored ) {
	if ( $actor->isRegistered() ) {
	$type = array_rand( self::VALID_LOG_EVENTS );
	} else {
	$type = 'move';
	}
	$action = array_rand( array_flip( self::VALID_LOG_EVENTS[$type] ) );
	$this->simulateLogAction( $type, $action, $actor );
	if ( !$this->incrementAndCheck( $actionsPerformed, $actionsLeft ) ) {
	return $actionsPerformed;
	}
	}
	// Simulate an email 10% of the time
	if ( $actor->isRegistered() && $this->getRandomFloat() < 0.1 ) {
	$from = MailAddress::newFromUser( $actorAsUserObject );
	$to = MailAddress::newFromUser( $this->userToEmailAndSendPasswordResetsFor );
	$subject = 'Test';
	$text = wfRandomString();
	$error = [];
	$this->privateEventsHandler->onEmailUser( $to, $from, $subject, $text, $error );
	if ( !$this->incrementAndCheck( $actionsPerformed, $actionsLeft ) ) {
	return $actionsPerformed;
	}
	}
	// Send password reset 10% of the time.
	if ( $this->getRandomFloat() < 0.1 ) {
	$this->privateEventsHandler->onUser__mailPasswordInternal(
	$actorAsUserObject,
	RequestContext::getMain()->getRequest()->getIP(),
	$this->userToEmailAndSendPasswordResetsFor
	);
	if ( !$this->incrementAndCheck( $actionsPerformed, $actionsLeft ) ) {
	return $actionsPerformed;
	}
	}
	// Logout 50% of the time
	if ( $actor->isRegistered() && $this->getRandomFloat() < 0.5 ) {
	$html = '';
	$anonUser = $services->getUserFactory()->newFromName(
	RequestContext::getMain()->getRequest()->getIP(),
	UserRigorOptions::RIGOR_NONE
	);
	if ( $anonUser ) {
	$this->privateEventsHandler->onUserLogoutComplete( $anonUser, $html, $actor->getName() );
	}
	$this->incrementAndCheck( $actionsPerformed, $actionsLeft );
	}
	return $actionsPerformed;
	}

	/**
	* Simulate a log action by creating an entry in Special:Log but not actually
	* performing the action that is referenced in the log entry.
	*
	* Then tell CheckUser about this log entry, so that it is stored in the
	* results list.
	*
	* @param string $type The log type
	* @param string $action The log subtype (otherwise known as action)
	* @param UserIdentity $actor The intended performer of this log action.
	* @return void
	*/
	private function simulateLogAction( string $type, string $action, UserIdentity $actor ): void {
	$logEntry = new ManualLogEntry( $type, $action );
	$logEntry->setPerformer( $actor );
	$logEntry->setTarget( Title::newFromText( $this->getPrefix() . 'Existing page' ) );
	$logEntry->setComment( wfRandomString() );
	if ( $type === 'move' ) {
	$logEntry->setParameters( [
	'4::target' => $this->getPrefix() . wfRandomString(),
	'5::noredir' => '0'
	] );
	} elseif ( $type === 'merge' ) {
	$logEntry->setParameters( [
	'4::dest' => $this->getPrefix() . wfRandomString(),
	'5::mergepoint' => $logEntry->getTimestamp()
	] );
	} elseif ( $type === 'delete' && $action === 'undelete' ) {
	$logEntry->setParameters( [
	':assoc:count' => [
	'revisions' => 123,
	'files' => 1,
	],
	] );
	}
	$id = $logEntry->insert();
	$this->recentChangeSaveHandler->onRecentChange_save( $logEntry->getRecentChange( $id ) );
	}

	/**
	* Actually perform an edit using the given actor
	* that is published to Special:RecentChanges (and
	* then by extension Special:CheckUser)
	*
	* @param User $actor The user which is performing the edit
	* @param Title\|null $title The title of the page the edit will be performed on. Use null for a random title.
	* @return int\|null The revision ID of the edit if successful, otherwise null.
	*/
	private function performEdit( User $actor, ?Title $title ): ?int {
	$tags = 0;
	if ( $this->getRandomFloat() < 0.5 ) {
	// Add minor edit flag 50% of the time.
	$tags = EDIT_MINOR;
	}
	$title ??= Title::newFromText( $this->getPrefix() . wfRandomString() );
	if ( !$title ) {
	return null;
	}
	$page = $this->getServiceContainer()->getWikiPageFactory()->newFromTitle( $title );
	$status = $page->doUserEditContent(
	ContentHandler::makeContent(
	wfRandomString(),
	$title,
	// Regardless of how the wiki is configure or what extensions are present,
	// force this page to be a wikitext one.
	CONTENT_MODEL_WIKITEXT
	),
	$actor,
	wfRandomString(),
	$tags
	);
	if ( !$status->isOK() ) {
	return null;
	}
	return $status->getNewRevision()->getId();
	}

	/**
	* Increment the actions performed counter, move the fake time forward
	* by a random time no greater than 240 seconds and then check if more
	* actions can be performed by checking against the second parameter
	*
	* @param int &$actionsPerformed The number of actions performed on this insert batch
	* @param int $actionsLeft The number of actions left to perform for this actor
	* @return bool Whether more actions can be performed
	*/
	private function incrementAndCheck( int &$actionsPerformed, int $actionsLeft ): bool {
	$actionsPerformed++;
	$this->moveFakeTimeForward();
	return $actionsPerformed < $actionsLeft;
	}

	/**
	* Set the time to a fake time between now and CUDMaxAge seconds ago.
	*
	* @param ?int $lowerLimit The maximum number of seconds ago this random timestamp can be. An hour
	* is always added to this number.
	* @return void
	*/
	private function setNewRandomFakeTime( ?int $lowerLimit = null ): void {
	// Clear any fake time (to allow the ConvertibleTimestamp::time() call to use the real time).
	ConvertibleTimestamp::setFakeTime( false );
	// Set the new fake time
	//
	// Ensure the new fake time is at least an hour ago from the actual time.
	$newFakeTime = ConvertibleTimestamp::time() - 3600;
	// Ensure the new fake time is appropriately chosen from any time period results can be in.
	if ( $lowerLimit === null ) {
	// Default is to ensure random time cannot be more than CUDMaxAge seconds ago minus 2 hours.
	$lowerLimit = $this->getConfig()->get( 'CUDMaxAge' ) - ( 3600 * 2 );
	}
	$newFakeTime -= intval( $this->getRandomFloat() * $lowerLimit );
	ConvertibleTimestamp::setFakeTime( $newFakeTime );
	}

	/**
	* Move the fake time forward by a random number of seconds between 0 and 240 seconds.
	*
	* @return void
	*/
	private function moveFakeTimeForward(): void {
	ConvertibleTimestamp::setFakeTime(
	ConvertibleTimestamp::time() + intval( $this->getRandomFloat() * 239 ) + 1
	);
	}

	/**
	* Initialise the User-Agent header and Client Hints combinations
	* as the ClientHints objects cannot be created in a constant property.
	*
	* @return void
	*/
	private function initUserAgentAndClientHintsCombos(): void {
	$this->userAgentsToClientHintsMap = [
	'Mozilla/5.0 (iPhone13,2; U; CPU iPhone OS 14_0 like Mac OS X) AppleWebKit/602.1.50 ' .
	'(KHTML, like Gecko) Version/10.0 Mobile/15E148 Safari/602.1' =>
	null,
	'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0' =>
	null,
	];
	$this->userAgentsToClientHintsMap[
	'Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) ' .
	'Chrome/115.0.0.0 Mobile Safari/537.36'
	] = new ClientHintsData(
	"",
	"64",
	[
	[ "brand" => "Not/A)Brand", "version" => "99" ],
	[ "brand" => "Google Chrome", "version" => "115" ],
	[ "brand" => "Chromium", "version" => "115" ],
	],
	null,
	[
	[ "brand" => "Not/A)Brand", "version" => "99.0.0.0" ],
	[ "brand" => "Google Chrome", "version" => "115.0.5790.171" ],
	[ "brand" => "Chromium", "version" => "115.0.5790.171" ],
	],
	true,
	"SM-G965U",
	"Android",
	"10.0.0",
	'"Not/A)Brand";v="99", "Google Chrome";v="115", "Chromium";v="115"',
	false
	);
	$this->userAgentsToClientHintsMap[
	'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) ' .
	'Chrome/112.0.0.0 Safari/537.36 OPR/98.0.0.0'
	] = new ClientHintsData(
	"x86",
	"64",
	[
	[ "brand" => "Chromium", "version" => "112" ],
	[ "brand" => "Not_A Brand", "version" => "24" ],
	[ "brand" => "Opera GX", "version" => "98" ],
	],
	null,
	[
	[ "brand" => "Chromium", "version" => "112.0.5615.165" ],
	[ "brand" => "Not_A Brand", "version" => "24.0.0.0" ],
	[ "brand" => "Opera GX", "version" => "98.0.4759.82" ],
	],
	false,
	"",
	"Windows",
	"15.0.0",
	'"Chromium";v="112", "Not_A Brand";v="24", "Opera GX";v="98"',
	false
	);
	$this->userAgentsToClientHintsMap[
	'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) ' .
	'Chrome/115.0.0.0 Safari/537.36'
	] = new ClientHintsData(
	"x86",
	"64",
	[
	[ "brand" => "Not/A)Brand", "version" => "99" ],
	[ "brand" => "Google Chrome", "version" => "115" ],
	[ "brand" => "Chromium", "version" => "115" ],
	],
	null,
	[
	[ "brand" => "Not/A)Brand", "version" => "99.0.0.0" ],
	[ "brand" => "Google Chrome", "version" => "115.0.5790.171" ],
	[ "brand" => "Chromium", "version" => "115.0.5790.171" ],
	],
	false,
	"",
	"Windows",
	"15.0.0",
	'"Not/A)Brand";v="99", "Google Chrome";v="115", "Chromium";v="115"',
	false
	);
	$this->userAgentsToClientHintsMap[
	'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) ' .
	'Chrome/114.0.0.0 Safari/537.36'
	] = new ClientHintsData(
	"x86",
	null,
	[
	[ "brand" => "Not/A)Brand", "version" => "99" ],
	[ "brand" => "Google Chrome", "version" => "114" ],
	[ "brand" => "Chromium", "version" => "114" ],
	],
	null,
	null,
	false,
	"",
	"Windows",
	null,
	'"Not/A)Brand";v="99", "Google Chrome";v="115", "Chromium";v="115"',
	null
	);
	}

	private function getPrefix(): string {
	return 'CheckUserSimulated-';
	}
	}

	$maintClass = PopulateCheckUserTablesWithSimulatedData::class;
	require_once RUN_MAINTENANCE_IF_MAIN;

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