PhabricatorCursorPagedPolicyAwareQuery.php
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Created: Tue, Jul 15, 13:53

PhabricatorCursorPagedPolicyAwareQuery.php
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	<?php

	/**
	* A query class which uses cursor-based paging. This paging is much more
	* performant than offset-based paging in the presence of policy filtering.
	*
	* @task appsearch Integration with ApplicationSearch
	* @task paging Paging
	* @task order Result Ordering
	*/
	abstract class PhabricatorCursorPagedPolicyAwareQuery
	extends PhabricatorPolicyAwareQuery {

	private $afterID;
	private $beforeID;
	private $applicationSearchConstraints = array();
	private $applicationSearchOrders = array();
	private $internalPaging;
	private $orderVector;

	protected function getPagingColumn() {
	return 'id';
	}

	protected function getPagingValue($result) {
	if (!is_object($result)) {
	// This interface can't be typehinted and PHP gets really angry if we
	// call a method on a non-object, so add an explicit check here.
	throw new Exception(pht('Expected object, got "%s"!', gettype($result)));
	}
	return $result->getID();
	}

	protected function getReversePaging() {
	return false;
	}

	protected function nextPage(array $page) {
	// See getPagingViewer() for a description of this flag.
	$this->internalPaging = true;

	if ($this->beforeID) {
	$this->beforeID = $this->getPagingValue(last($page));
	} else {
	$this->afterID = $this->getPagingValue(last($page));
	}
	}

	final public function setAfterID($object_id) {
	$this->afterID = $object_id;
	return $this;
	}

	final protected function getAfterID() {
	return $this->afterID;
	}

	final public function setBeforeID($object_id) {
	$this->beforeID = $object_id;
	return $this;
	}

	final protected function getBeforeID() {
	return $this->beforeID;
	}


	/**
	* Get the viewer for making cursor paging queries.
	*
	* NOTE: You should ONLY use this viewer to load cursor objects while
	* building paging queries.
	*
	* Cursor paging can happen in two ways. First, the user can request a page
	* like `/stuff/?after=33`, which explicitly causes paging. Otherwise, we
	* can fall back to implicit paging if we filter some results out of a
	* result list because the user can't see them and need to go fetch some more
	* results to generate a large enough result list.
	*
	* In the first case, want to use the viewer's policies to load the object.
	* This prevents an attacker from figuring out information about an object
	* they can't see by executing queries like `/stuff/?after=33&order=name`,
	* which would otherwise give them a hint about the name of the object.
	* Generally, if a user can't see an object, they can't use it to page.
	*
	* In the second case, we need to load the object whether the user can see
	* it or not, because we need to examine new results. For example, if a user
	* loads `/stuff/` and we run a query for the first 100 items that they can
	* see, but the first 100 rows in the database aren't visible, we need to
	* be able to issue a query for the next 100 results. If we can't load the
	* cursor object, we'll fail or issue the same query over and over again.
	* So, generally, internal paging must bypass policy controls.
	*
	* This method returns the appropriate viewer, based on the context in which
	* the paging is occuring.
	*
	* @return PhabricatorUser Viewer for executing paging queries.
	*/
	final protected function getPagingViewer() {
	if ($this->internalPaging) {
	return PhabricatorUser::getOmnipotentUser();
	} else {
	return $this->getViewer();
	}
	}

	final protected function buildLimitClause(AphrontDatabaseConnection $conn_r) {
	if ($this->getRawResultLimit()) {
	return qsprintf($conn_r, 'LIMIT %d', $this->getRawResultLimit());
	} else {
	return '';
	}
	}

	final protected function didLoadResults(array $results) {
	if ($this->beforeID) {
	$results = array_reverse($results, $preserve_keys = true);
	}
	return $results;
	}

	final public function executeWithCursorPager(AphrontCursorPagerView $pager) {
	$this->setLimit($pager->getPageSize() + 1);

	if ($pager->getAfterID()) {
	$this->setAfterID($pager->getAfterID());
	} else if ($pager->getBeforeID()) {
	$this->setBeforeID($pager->getBeforeID());
	}

	$results = $this->execute();

	$sliced_results = $pager->sliceResults($results);

	if ($sliced_results) {
	if ($pager->getBeforeID() \|\| (count($results) > $pager->getPageSize())) {
	$pager->setNextPageID($this->getPagingValue(last($sliced_results)));
	}

	if ($pager->getAfterID() \|\|
	($pager->getBeforeID() && (count($results) > $pager->getPageSize()))) {
	$pager->setPrevPageID($this->getPagingValue(head($sliced_results)));
	}
	}

	return $sliced_results;
	}


	/**
	* Return the alias this query uses to identify the primary table.
	*
	* Some automatic query constructions may need to be qualified with a table
	* alias if the query performs joins which make column names ambiguous. If
	* this is the case, return the alias for the primary table the query
	* uses; generally the object table which has `id` and `phid` columns.
	*
	* @return string Alias for the primary table.
	*/
	protected function getPrimaryTableAlias() {
	return null;
	}


	/* -( Paging )------------------------------------------------------------- */


	protected function buildPagingClause(AphrontDatabaseConnection $conn) {
	$orderable = $this->getOrderableColumns();

	// TODO: Remove this once subqueries modernize.
	if (!$orderable) {
	if ($this->beforeID) {
	return qsprintf(
	$conn,
	'%Q %Q %s',
	$this->getPagingColumn(),
	$this->getReversePaging() ? '<' : '>',
	$this->beforeID);
	} else if ($this->afterID) {
	return qsprintf(
	$conn,
	'%Q %Q %s',
	$this->getPagingColumn(),
	$this->getReversePaging() ? '>' : '<',
	$this->afterID);
	} else {
	return null;
	}
	}

	$vector = $this->getOrderVector();

	if ($this->beforeID !== null) {
	$cursor = $this->beforeID;
	$reversed = true;
	} else if ($this->afterID !== null) {
	$cursor = $this->afterID;
	$reversed = false;
	} else {
	// No paging is being applied to this query so we do not need to
	// construct a paging clause.
	return '';
	}

	$keys = array();
	foreach ($vector as $order) {
	$keys[] = $order->getOrderKey();
	}

	$value_map = $this->getPagingValueMap($cursor, $keys);

	$columns = array();
	foreach ($vector as $order) {
	$key = $order->getOrderKey();

	if (!array_key_exists($key, $value_map)) {
	throw new Exception(
	pht(
	'Query "%s" failed to return a value from getPagingValueMap() '.
	'for column "%s".',
	get_class($this),
	$key));
	}

	$column = $orderable[$key];
	$column['value'] = $value_map[$key];

	$columns[] = $column;
	}

	return $this->buildPagingClauseFromMultipleColumns(
	$conn,
	$columns,
	array(
	'reversed' => $reversed,
	));
	}

	protected function getPagingValueMap($cursor, array $keys) {
	// TODO: This is a hack to make this work with existing classes for now.
	return array(
	'id' => $cursor,
	);
	}

	protected function loadCursorObject($cursor) {
	$query = newv(get_class($this), array())
	->setViewer($this->getPagingViewer())
	->withIDs(array((int)$cursor));

	$this->willExecuteCursorQuery($query);

	$object = $query->executeOne();
	if (!$object) {
	throw new Exception(
	pht(
	'Cursor "%s" does not identify a valid object.',
	$cursor));
	}

	return $object;
	}

	protected function willExecuteCursorQuery(
	PhabricatorCursorPagedPolicyAwareQuery $query) {
	return;
	}


	/**
	* Simplifies the task of constructing a paging clause across multiple
	* columns. In the general case, this looks like:
	*
	* A > a OR (A = a AND B > b) OR (A = a AND B = b AND C > c)
	*
	* To build a clause, specify the name, type, and value of each column
	* to include:
	*
	* $this->buildPagingClauseFromMultipleColumns(
	* $conn_r,
	* array(
	* array(
	* 'table' => 't',
	* 'column' => 'title',
	* 'type' => 'string',
	* 'value' => $cursor->getTitle(),
	* 'reverse' => true,
	* ),
	* array(
	* 'table' => 't',
	* 'column' => 'id',
	* 'type' => 'int',
	* 'value' => $cursor->getID(),
	* ),
	* ),
	* array(
	* 'reversed' => $is_reversed,
	* ));
	*
	* This method will then return a composable clause for inclusion in WHERE.
	*
	* @param AphrontDatabaseConnection Connection query will execute on.
	* @param list<map> Column description dictionaries.
	* @param map Additional constuction options.
	* @return string Query clause.
	*/
	final protected function buildPagingClauseFromMultipleColumns(
	AphrontDatabaseConnection $conn,
	array $columns,
	array $options) {

	foreach ($columns as $column) {
	PhutilTypeSpec::checkMap(
	$column,
	array(
	'table' => 'optional string\|null',
	'column' => 'string',
	'value' => 'wild',
	'type' => 'string',
	'reverse' => 'optional bool',
	'unique' => 'optional bool',
	));
	}

	PhutilTypeSpec::checkMap(
	$options,
	array(
	'reversed' => 'optional bool',
	));

	$is_query_reversed = idx($options, 'reversed', false);

	$clauses = array();
	$accumulated = array();
	$last_key = last_key($columns);
	foreach ($columns as $key => $column) {
	$type = $column['type'];
	switch ($type) {
	case 'null':
	$value = qsprintf($conn, '%d', ($column['value'] ? 0 : 1));
	break;
	case 'int':
	$value = qsprintf($conn, '%d', $column['value']);
	break;
	case 'float':
	$value = qsprintf($conn, '%f', $column['value']);
	break;
	case 'string':
	$value = qsprintf($conn, '%s', $column['value']);
	break;
	default:
	throw new Exception("Unknown column type '{$type}'!");
	}

	$is_column_reversed = idx($column, 'reverse', false);
	$reverse = ($is_query_reversed xor $is_column_reversed);

	$clause = $accumulated;

	$table_name = idx($column, 'table');
	$column_name = $column['column'];
	if ($table_name !== null) {
	$field = qsprintf($conn, '%T.%T', $table_name, $column_name);
	} else {
	$field = qsprintf($conn, '%T', $column_name);
	}

	if ($type == 'null') {
	$field = qsprintf($conn, '(%Q IS NULL)', $field);
	}

	$clause[] = qsprintf(
	$conn,
	'%Q %Q %Q',
	$field,
	$reverse ? '>' : '<',
	$value);
	$clauses[] = '('.implode(') AND (', $clause).')';

	$accumulated[] = qsprintf(
	$conn,
	'%Q = %Q',
	$field,
	$value);
	}

	return '('.implode(') OR (', $clauses).')';
	}


	/* -( Result Ordering )---------------------------------------------------- */


	/**
	* @task order
	*/
	public function setOrderVector($vector) {
	$vector = PhabricatorQueryOrderVector::newFromVector($vector);

	$orderable = $this->getOrderableColumns();

	// Make sure that all the components identify valid columns.
	$unique = array();
	foreach ($vector as $order) {
	$key = $order->getOrderKey();
	if (empty($orderable[$key])) {
	$valid = implode(', ', array_keys($orderable));
	throw new Exception(
	pht(
	'This query ("%s") does not support sorting by order key "%s". '.
	'Supported orders are: %s.',
	get_class($this),
	$key,
	$valid));
	}

	$unique[$key] = idx($orderable[$key], 'unique', false);
	}

	// Make sure that the last column is unique so that this is a strong
	// ordering which can be used for paging.
	$last = last($unique);
	if ($last !== true) {
	throw new Exception(
	pht(
	'Order vector "%s" is invalid: the last column in an order must '.
	'be a column with unique values, but "%s" is not unique.',
	$vector->getAsString(),
	last_key($unique)));
	}

	// Make sure that other columns are not unique; an ordering like "id, name"
	// does not make sense because only "id" can ever have an effect.
	array_pop($unique);
	foreach ($unique as $key => $is_unique) {
	if ($is_unique) {
	throw new Exception(
	pht(
	'Order vector "%s" is invalid: only the last column in an order '.
	'may be unique, but "%s" is a unique column and not the last '.
	'column in the order.',
	$vector->getAsString(),
	$key));
	}
	}

	$this->orderVector = $vector;
	return $this;
	}


	/**
	* @task order
	*/
	protected function getOrderVector() {
	if (!$this->orderVector) {
	$vector = $this->getDefaultOrderVector();
	$vector = PhabricatorQueryOrderVector::newFromVector($vector);

	// We call setOrderVector() here to apply checks to the default vector.
	// This catches any errors in the implementation.
	$this->setOrderVector($vector);
	}

	return $this->orderVector;
	}


	/**
	* @task order
	*/
	protected function getDefaultOrderVector() {
	return array('id');
	}


	/**
	* @task order
	*/
	public function getOrderableColumns() {
	// TODO: Remove this once all subclasses move off the old stuff.
	if ($this->getPagingColumn() !== 'id') {
	// This class has bad old custom logic around paging, so return nothing
	// here. This deactivates the new order code.
	return array();
	}

	return array(
	'id' => array(
	'table' => $this->getPrimaryTableAlias(),
	'column' => 'id',
	'reverse' => false,
	'type' => 'int',
	'unique' => true,
	),
	);
	}


	/**
	* @task order
	*/
	final protected function buildOrderClause(AphrontDatabaseConnection $conn) {
	$orderable = $this->getOrderableColumns();

	// TODO: Remove this once all subclasses move off the old stuff. We'll
	// only enter this block for code using older ordering mechanisms. New
	// code should expose an orderable column list.
	if (!$orderable) {
	if ($this->beforeID) {
	return qsprintf(
	$conn,
	'ORDER BY %Q %Q',
	$this->getPagingColumn(),
	$this->getReversePaging() ? 'DESC' : 'ASC');
	} else {
	return qsprintf(
	$conn,
	'ORDER BY %Q %Q',
	$this->getPagingColumn(),
	$this->getReversePaging() ? 'ASC' : 'DESC');
	}
	}

	$vector = $this->getOrderVector();

	$parts = array();
	foreach ($vector as $order) {
	$part = $orderable[$order->getOrderKey()];
	if ($order->getIsReversed()) {
	$part['reverse'] = !idx($part, 'reverse', false);
	}
	$parts[] = $part;
	}

	return $this->formatOrderClause($conn, $parts);
	}


	/**
	* @task order
	*/
	protected function formatOrderClause(
	AphrontDatabaseConnection $conn,
	array $parts) {

	$is_query_reversed = false;
	if ($this->getReversePaging()) {
	$is_query_reversed = !$is_query_reversed;
	}

	if ($this->getBeforeID()) {
	$is_query_reversed = !$is_query_reversed;
	}

	$sql = array();
	foreach ($parts as $key => $part) {
	$is_column_reversed = !empty($part['reverse']);

	$descending = true;
	if ($is_query_reversed) {
	$descending = !$descending;
	}

	if ($is_column_reversed) {
	$descending = !$descending;
	}

	$table = idx($part, 'table');
	$column = $part['column'];

	if ($descending) {
	if ($table !== null) {
	$sql[] = qsprintf($conn, '%T.%T DESC', $table, $column);
	} else {
	$sql[] = qsprintf($conn, '%T DESC', $column);
	}
	} else {
	if ($table !== null) {
	$sql[] = qsprintf($conn, '%T.%T ASC', $table, $column);
	} else {
	$sql[] = qsprintf($conn, '%T ASC', $column);
	}
	}
	}

	return qsprintf($conn, 'ORDER BY %Q', implode(', ', $sql));
	}


	/* -( Application Search )------------------------------------------------- */


	/**
	* Constrain the query with an ApplicationSearch index, requiring field values
	* contain at least one of the values in a set.
	*
	* This constraint can build the most common types of queries, like:
	*
	* - Find users with shirt sizes "X" or "XL".
	* - Find shoes with size "13".
	*
	* @param PhabricatorCustomFieldIndexStorage Table where the index is stored.
	* @param string\|list<string> One or more values to filter by.
	* @return this
	* @task appsearch
	*/
	public function withApplicationSearchContainsConstraint(
	PhabricatorCustomFieldIndexStorage $index,
	$value) {

	$this->applicationSearchConstraints[] = array(
	'type' => $index->getIndexValueType(),
	'cond' => '=',
	'table' => $index->getTableName(),
	'index' => $index->getIndexKey(),
	'value' => $value,
	);

	return $this;
	}


	/**
	* Constrain the query with an ApplicationSearch index, requiring values
	* exist in a given range.
	*
	* This constraint is useful for expressing date ranges:
	*
	* - Find events between July 1st and July 7th.
	*
	* The ends of the range are inclusive, so a `$min` of `3` and a `$max` of
	* `5` will match fields with values `3`, `4`, or `5`. Providing `null` for
	* either end of the range will leave that end of the constraint open.
	*
	* @param PhabricatorCustomFieldIndexStorage Table where the index is stored.
	* @param int\|null Minimum permissible value, inclusive.
	* @param int\|null Maximum permissible value, inclusive.
	* @return this
	* @task appsearch
	*/
	public function withApplicationSearchRangeConstraint(
	PhabricatorCustomFieldIndexStorage $index,
	$min,
	$max) {

	$index_type = $index->getIndexValueType();
	if ($index_type != 'int') {
	throw new Exception(
	pht(
	'Attempting to apply a range constraint to a field with index type '.
	'"%s", expected type "%s".',
	$index_type,
	'int'));
	}

	$this->applicationSearchConstraints[] = array(
	'type' => $index->getIndexValueType(),
	'cond' => 'range',
	'table' => $index->getTableName(),
	'index' => $index->getIndexKey(),
	'value' => array($min, $max),
	);

	return $this;
	}


	/**
	* Order the results by an ApplicationSearch index.
	*
	* @param PhabricatorCustomField Field to which the index belongs.
	* @param PhabricatorCustomFieldIndexStorage Table where the index is stored.
	* @param bool True to sort ascending.
	* @return this
	* @task appsearch
	*/
	public function withApplicationSearchOrder(
	PhabricatorCustomField $field,
	PhabricatorCustomFieldIndexStorage $index,
	$ascending) {

	$this->applicationSearchOrders[] = array(
	'key' => $field->getFieldKey(),
	'type' => $index->getIndexValueType(),
	'table' => $index->getTableName(),
	'index' => $index->getIndexKey(),
	'ascending' => $ascending,
	);

	return $this;
	}


	/**
	* Get the name of the query's primary object PHID column, for constructing
	* JOIN clauses. Normally (and by default) this is just `"phid"`, but it may
	* be something more exotic.
	*
	* See @{method:getPrimaryTableAlias} if the column needs to be qualified with
	* a table alias.
	*
	* @return string Column name.
	* @task appsearch
	*/
	protected function getApplicationSearchObjectPHIDColumn() {
	if ($this->getPrimaryTableAlias()) {
	$prefix = $this->getPrimaryTableAlias().'.';
	} else {
	$prefix = '';
	}

	return $prefix.'phid';
	}


	/**
	* Determine if the JOINs built by ApplicationSearch might cause each primary
	* object to return multiple result rows. Generally, this means the query
	* needs an extra GROUP BY clause.
	*
	* @return bool True if the query may return multiple rows for each object.
	* @task appsearch
	*/
	protected function getApplicationSearchMayJoinMultipleRows() {
	foreach ($this->applicationSearchConstraints as $constraint) {
	$type = $constraint['type'];
	$value = $constraint['value'];
	$cond = $constraint['cond'];

	switch ($cond) {
	case '=':
	switch ($type) {
	case 'string':
	case 'int':
	if (count((array)$value) > 1) {
	return true;
	}
	break;
	default:
	throw new Exception(pht('Unknown index type "%s"!', $type));
	}
	break;
	case 'range':
	// NOTE: It's possible to write a custom field where multiple rows
	// match a range constraint, but we don't currently ship any in the
	// upstream and I can't immediately come up with cases where this
	// would make sense.
	break;
	default:
	throw new Exception(pht('Unknown constraint condition "%s"!', $cond));
	}
	}

	return false;
	}


	/**
	* Construct a GROUP BY clause appropriate for ApplicationSearch constraints.
	*
	* @param AphrontDatabaseConnection Connection executing the query.
	* @return string Group clause.
	* @task appsearch
	*/
	protected function buildApplicationSearchGroupClause(
	AphrontDatabaseConnection $conn_r) {

	if ($this->getApplicationSearchMayJoinMultipleRows()) {
	return qsprintf(
	$conn_r,
	'GROUP BY %Q',
	$this->getApplicationSearchObjectPHIDColumn());
	} else {
	return '';
	}
	}


	/**
	* Construct a JOIN clause appropriate for applying ApplicationSearch
	* constraints.
	*
	* @param AphrontDatabaseConnection Connection executing the query.
	* @return string Join clause.
	* @task appsearch
	*/
	protected function buildApplicationSearchJoinClause(
	AphrontDatabaseConnection $conn_r) {

	$joins = array();
	foreach ($this->applicationSearchConstraints as $key => $constraint) {
	$table = $constraint['table'];
	$alias = 'appsearch_'.$key;
	$index = $constraint['index'];
	$cond = $constraint['cond'];
	$phid_column = $this->getApplicationSearchObjectPHIDColumn();
	switch ($cond) {
	case '=':
	$type = $constraint['type'];
	switch ($type) {
	case 'string':
	$constraint_clause = qsprintf(
	$conn_r,
	'%T.indexValue IN (%Ls)',
	$alias,
	(array)$constraint['value']);
	break;
	case 'int':
	$constraint_clause = qsprintf(
	$conn_r,
	'%T.indexValue IN (%Ld)',
	$alias,
	(array)$constraint['value']);
	break;
	default:
	throw new Exception(pht('Unknown index type "%s"!', $type));
	}

	$joins[] = qsprintf(
	$conn_r,
	'JOIN %T %T ON %T.objectPHID = %Q
	AND %T.indexKey = %s
	AND (%Q)',
	$table,
	$alias,
	$alias,
	$phid_column,
	$alias,
	$index,
	$constraint_clause);
	break;
	case 'range':
	list($min, $max) = $constraint['value'];
	if (($min === null) && ($max === null)) {
	// If there's no actual range constraint, just move on.
	break;
	}

	if ($min === null) {
	$constraint_clause = qsprintf(
	$conn_r,
	'%T.indexValue <= %d',
	$alias,
	$max);
	} else if ($max === null) {
	$constraint_clause = qsprintf(
	$conn_r,
	'%T.indexValue >= %d',
	$alias,
	$min);
	} else {
	$constraint_clause = qsprintf(
	$conn_r,
	'%T.indexValue BETWEEN %d AND %d',
	$alias,
	$min,
	$max);
	}

	$joins[] = qsprintf(
	$conn_r,
	'JOIN %T %T ON %T.objectPHID = %Q
	AND %T.indexKey = %s
	AND (%Q)',
	$table,
	$alias,
	$alias,
	$phid_column,
	$alias,
	$index,
	$constraint_clause);
	break;
	default:
	throw new Exception(pht('Unknown constraint condition "%s"!', $cond));
	}
	}

	foreach ($this->applicationSearchOrders as $key => $order) {
	$table = $order['table'];
	$alias = 'appsearch_order_'.$key;
	$index = $order['index'];
	$phid_column = $this->getApplicationSearchObjectPHIDColumn();

	$joins[] = qsprintf(
	$conn_r,
	'LEFT JOIN %T %T ON %T.objectPHID = %Q
	AND %T.indexKey = %s',
	$table,
	$alias,
	$alias,
	$phid_column,
	$alias,
	$index);
	}

	return implode(' ', $joins);
	}

	protected function buildApplicationSearchOrders(
	AphrontDatabaseConnection $conn_r,
	$reverse) {

	$orders = array();
	foreach ($this->applicationSearchOrders as $key => $order) {
	$alias = 'appsearch_order_'.$key;

	if ($order['ascending'] xor $reverse) {
	$orders[] = qsprintf($conn_r, '%T.indexValue ASC', $alias);
	} else {
	$orders[] = qsprintf($conn_r, '%T.indexValue DESC', $alias);
	}
	}

	return $orders;
	}

	protected function buildApplicationSearchPagination(
	AphrontDatabaseConnection $conn_r,
	$cursor) {

	// We have to get the current field values on the cursor object.
	$fields = PhabricatorCustomField::getObjectFields(
	$cursor,
	PhabricatorCustomField::ROLE_APPLICATIONSEARCH);
	$fields->setViewer($this->getViewer());
	$fields->readFieldsFromStorage($cursor);

	$fields = mpull($fields->getFields(), null, 'getFieldKey');

	$columns = array();
	foreach ($this->applicationSearchOrders as $key => $order) {
	$alias = 'appsearch_order_'.$key;

	$field = idx($fields, $order['key']);

	$columns[] = array(
	'name' => $alias.'.indexValue',
	'value' => $field->getValueForStorage(),
	'type' => $order['type'],
	);
	}

	return $columns;
	}

	}

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