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', '>=', '<', '<=', 'BETWEEN', 'NOT BETWEEN', ); /** * Prefix used when generating aliases for the metadata table. * * @var string */ private const ALIAS_PREFIX = 'meta'; /** * Name of the main orders table. * * @var string */ private $meta_table = ''; /** * Name of the metadata table. * * @var string */ private $orders_table = ''; /** * Sanitized `meta_query`. * * @var array */ private $queries = array(); /** * Flat list of clauses by name. * * @var array */ private $flattened_clauses = array(); /** * JOIN clauses to add to the main SQL query. * * @var array */ private $join = array(); /** * WHERE clauses to add to the main SQL query. * * @var array */ private $where = array(); /** * Table aliases in use by the meta query. Used to optimize JOINs when possible. * * @var array */ private $table_aliases = array(); /** * Constructor. * * @param OrdersTableQuery $q The main query being performed. */ public function __construct( OrdersTableQuery $q ) { $meta_query = $q->get( 'meta_query' ); if ( ! $meta_query ) { return; } $this->queries = $this->sanitize_meta_query( $meta_query ); $this->meta_table = $q->get_table_name( 'meta' ); $this->orders_table = $q->get_table_name( 'orders' ); $this->build_query(); } /** * Returns JOIN and WHERE clauses to be appended to the main SQL query. * * @return array { * @type string $join JOIN clause. * @type string $where WHERE clause. * } */ public function get_sql_clauses(): array { return array( 'join' => $this->sanitize_join( $this->join ), 'where' => $this->flatten_where_clauses( $this->where ), ); } /** * Returns a list of names (corresponding to meta_query clauses) that can be used as an 'orderby' arg. * * @since 7.4 * * @return array */ public function get_orderby_keys(): array { if ( ! $this->flattened_clauses ) { return array(); } $keys = array(); $keys[] = 'meta_value'; $keys[] = 'meta_value_num'; $first_clause = reset( $this->flattened_clauses ); if ( $first_clause && ! empty( $first_clause['key'] ) ) { $keys[] = $first_clause['key']; } $keys = array_merge( $keys, array_keys( $this->flattened_clauses ) ); return $keys; } /** * Returns an SQL fragment for the given meta_query key that can be used in an ORDER BY clause. * Call {@see 'get_orderby_keys'} to obtain a list of valid keys. * * @since 7.4 * * @param string $key The key name. * @return string * * @throws \Exception When an invalid key is passed. */ public function get_orderby_clause_for_key( string $key ): string { $clause = false; if ( isset( $this->flattened_clauses[ $key ] ) ) { $clause = $this->flattened_clauses[ $key ]; } else { $first_clause = reset( $this->flattened_clauses ); if ( $first_clause && ! empty( $first_clause['key'] ) ) { if ( 'meta_value_num' === $key ) { return "{$first_clause['alias']}.meta_value+0"; } if ( 'meta_value' === $key || $first_clause['key'] === $key ) { $clause = $first_clause; } } } if ( ! $clause ) { // translators: %s is a meta_query key. throw new \Exception( sprintf( __( 'Invalid meta_query clause key: %s.', 'woocommerce' ), $key ) ); } return "CAST({$clause['alias']}.meta_value AS {$clause['cast']})"; } /** * Checks whether a given meta_query clause is atomic or not (i.e. not nested). * * @param array $arg The meta_query clause. * @return boolean TRUE if atomic, FALSE otherwise. */ private function is_atomic( array $arg ): bool { return isset( $arg['key'] ) || isset( $arg['value'] ); } /** * Sanitizes the meta_query argument. * * @param array $q A meta_query array. * @return array A sanitized meta query array. */ private function sanitize_meta_query( array $q ): array { $sanitized = array(); foreach ( $q as $key => $arg ) { if ( 'relation' === $key ) { $relation = $arg; } elseif ( ! is_array( $arg ) ) { continue; } elseif ( $this->is_atomic( $arg ) ) { if ( isset( $arg['value'] ) && array() === $arg['value'] ) { unset( $arg['value'] ); } $arg['compare'] = isset( $arg['compare'] ) ? strtoupper( $arg['compare'] ) : ( isset( $arg['value'] ) && is_array( $arg['value'] ) ? 'IN' : '=' ); $arg['compare_key'] = isset( $arg['compare_key'] ) ? strtoupper( $arg['compare_key'] ) : ( isset( $arg['key'] ) && is_array( $arg['key'] ) ? 'IN' : '=' ); if ( ! in_array( $arg['compare'], self::NON_NUMERIC_OPERATORS, true ) && ! in_array( $arg['compare'], self::NUMERIC_OPERATORS, true ) ) { $arg['compare'] = '='; } if ( ! in_array( $arg['compare_key'], self::NON_NUMERIC_OPERATORS, true ) ) { $arg['compare_key'] = '='; } $sanitized[ $key ] = $arg; $sanitized[ $key ]['index'] = $key; } else { $sanitized_arg = $this->sanitize_meta_query( $arg ); if ( $sanitized_arg ) { $sanitized[ $key ] = $sanitized_arg; } } } if ( $sanitized ) { $sanitized['relation'] = 1 === count( $sanitized ) ? 'OR' : $this->sanitize_relation( $relation ?? 'AND' ); } return $sanitized; } /** * Makes sure we use an AND or OR relation. Defaults to AND. * * @param string $relation An unsanitized relation prop. * @return string */ private function sanitize_relation( string $relation ): string { if ( ! empty( $relation ) && 'OR' === strtoupper( $relation ) ) { return 'OR'; } return 'AND'; } /** * Returns the correct type for a given meta type. * * @param string $type MySQL type. * @return string MySQL type. */ private function sanitize_cast_type( string $type = '' ): string { $meta_type = strtoupper( $type ); if ( ! $meta_type || ! preg_match( '/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/', $meta_type ) ) { return 'CHAR'; } if ( 'NUMERIC' === $meta_type ) { $meta_type = 'SIGNED'; } return $meta_type; } /** * Makes sure a JOIN array does not have duplicates. * * @param array $join A JOIN array. * @return array A sanitized JOIN array. */ private function sanitize_join( array $join ): array { return array_filter( array_unique( array_map( 'trim', $join ) ) ); } /** * Flattens a nested WHERE array. * * @param array $where A possibly nested WHERE array with AND/OR operators. * @return string An SQL WHERE clause. */ private function flatten_where_clauses( $where ): string { if ( is_string( $where ) ) { return trim( $where ); } $chunks = array(); $operator = $this->sanitize_relation( $where['operator'] ?? '' ); foreach ( $where as $key => $w ) { if ( 'operator' === $key ) { continue; } $flattened = $this->flatten_where_clauses( $w ); if ( $flattened ) { $chunks[] = $flattened; } } if ( $chunks ) { return '(' . implode( " {$operator} ", $chunks ) . ')'; } else { return ''; } } /** * Builds all the required internal bits for this meta query. * * @return void */ private function build_query(): void { if ( ! $this->queries ) { return; } $queries = $this->queries; $sql_where = $this->process( $queries ); $this->where = $sql_where; } /** * Processes meta_query entries and generates the necessary table aliases, JOIN statements and WHERE conditions. * * @param array $arg A meta query. * @param null|array $parent The parent of the element being processed. * @return array A nested array of WHERE conditions. */ private function process( array &$arg, &$parent = null ): array { $where = array(); if ( $this->is_atomic( $arg ) ) { $arg['alias'] = $this->find_or_create_table_alias_for_clause( $arg, $parent ); $arg['cast'] = $this->sanitize_cast_type( $arg['type'] ?? '' ); $where = array_filter( array( $this->generate_where_for_clause_key( $arg ), $this->generate_where_for_clause_value( $arg ), ) ); // Store clauses by their key for ORDER BY purposes. $flat_clause_key = is_int( $arg['index'] ) ? $arg['alias'] : $arg['index']; $unique_flat_key = $flat_clause_key; $i = 1; while ( isset( $this->flattened_clauses[ $unique_flat_key ] ) ) { $unique_flat_key = $flat_clause_key . '-' . $i; ++$i; } $this->flattened_clauses[ $unique_flat_key ] =& $arg; } else { // Nested. $relation = $arg['relation']; unset( $arg['relation'] ); $chunks = array(); foreach ( $arg as $index => &$clause ) { $chunks[] = $this->process( $clause, $arg ); } // Merge chunks of the form OR(m) with the surrounding clause. if ( 1 === count( $chunks ) ) { $where = $chunks[0]; } else { $where = array_merge( array( 'operator' => $relation, ), $chunks ); } } return $where; } /** * Generates a JOIN clause to handle an atomic meta_query clause. * * @param array $clause An atomic meta_query clause. * @param string $alias Metadata table alias to use. * @return string An SQL JOIN clause. */ private function generate_join_for_clause( array $clause, string $alias ): string { global $wpdb; if ( 'NOT EXISTS' === $clause['compare'] ) { if ( 'LIKE' === $clause['compare_key'] ) { return $wpdb->prepare( "LEFT JOIN {$this->meta_table} AS {$alias} ON ( {$this->orders_table}.id = {$alias}.order_id AND {$alias}.meta_key LIKE %s )", // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared '%' . $wpdb->esc_like( $clause['key'] ) . '%' ); } else { return $wpdb->prepare( "LEFT JOIN {$this->meta_table} AS {$alias} ON ( {$this->orders_table}.id = {$alias}.order_id AND {$alias}.meta_key = %s )", // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared $clause['key'] ); } } return "INNER JOIN {$this->meta_table} AS {$alias} ON ( {$this->orders_table}.id = {$alias}.order_id )"; } /** * Finds a common table alias that the meta_query clause can use, or creates one. * * @param array $clause An atomic meta_query clause. * @param array $parent_query The parent query this clause is in. * @return string A table alias for use in an SQL JOIN clause. */ private function find_or_create_table_alias_for_clause( array $clause, array $parent_query ): string { if ( ! empty( $clause['alias'] ) ) { return $clause['alias']; } $alias = false; $siblings = array_filter( $parent_query, array( __CLASS__, 'is_atomic' ) ); foreach ( $siblings as $sibling ) { if ( empty( $sibling['alias'] ) ) { continue; } if ( $this->is_operator_compatible_with_shared_join( $clause, $sibling, $parent_query['relation'] ?? 'AND' ) ) { $alias = $sibling['alias']; break; } } if ( ! $alias ) { $alias = self::ALIAS_PREFIX . count( $this->table_aliases ); $this->join[] = $this->generate_join_for_clause( $clause, $alias ); $this->table_aliases[] = $alias; } return $alias; } /** * Checks whether two meta_query clauses can share a JOIN. * * @param array $clause An atomic meta_query clause. * @param array $sibling An atomic meta_query clause. * @param string $relation The relation involving both clauses. * @return boolean TRUE if the clauses can share a table alias, FALSE otherwise. */ private function is_operator_compatible_with_shared_join( array $clause, array $sibling, string $relation = 'AND' ): bool { if ( ! $this->is_atomic( $clause ) || ! $this->is_atomic( $sibling ) ) { return false; } $valid_operators = array(); if ( 'OR' === $relation ) { $valid_operators = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' ); } elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) { $valid_operators = array( '!=', 'NOT IN', 'NOT LIKE' ); } return in_array( strtoupper( $clause['compare'] ), $valid_operators, true ) && in_array( strtoupper( $sibling['compare'] ), $valid_operators, true ); } /** * Generates an SQL WHERE clause for a given meta_query atomic clause based on its meta key. * Adapted from WordPress' `WP_Meta_Query::get_sql_for_clause()` method. * * @param array $clause An atomic meta_query clause. * @return string An SQL WHERE clause or an empty string if $clause is invalid. */ private function generate_where_for_clause_key( array $clause ): string { global $wpdb; if ( ! array_key_exists( 'key', $clause ) ) { return ''; } if ( 'NOT EXISTS' === $clause['compare'] ) { return "{$clause['alias']}.order_id IS NULL"; } $alias = $clause['alias']; $meta_compare_string_start = ''; $meta_compare_string_end = ''; $subquery_alias = ''; if ( in_array( $clause['compare_key'], array( '!=', 'NOT IN', 'NOT LIKE', 'NOT EXISTS', 'NOT REGEXP' ), true ) ) { $i = count( $this->table_aliases ); $subquery_alias = self::ALIAS_PREFIX . $i; $this->table_aliases[] = $subquery_alias; $meta_compare_string_start = 'NOT EXISTS ('; $meta_compare_string_start .= "SELECT 1 FROM {$this->meta_table} {$subquery_alias} "; $meta_compare_string_start .= "WHERE {$subquery_alias}.order_id = {$alias}.order_id "; $meta_compare_string_end = 'LIMIT 1'; $meta_compare_string_end .= ')'; } switch ( $clause['compare_key'] ) { case '=': case 'EXISTS': $where = $wpdb->prepare( "$alias.meta_key = %s", trim( $clause['key'] ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared break; case 'LIKE': $meta_compare_value = '%' . $wpdb->esc_like( trim( $clause['key'] ) ) . '%'; $where = $wpdb->prepare( "$alias.meta_key LIKE %s", $meta_compare_value ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared break; case 'IN': $meta_compare_string = "$alias.meta_key IN (" . substr( str_repeat( ',%s', count( (array) $clause['key'] ) ), 1 ) . ')'; $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared break; case 'RLIKE': case 'REGEXP': $operator = $clause['compare_key']; if ( isset( $clause['type_key'] ) && 'BINARY' === strtoupper( $clause['type_key'] ) ) { $cast = 'BINARY'; } else { $cast = ''; } $where = $wpdb->prepare( "$alias.meta_key $operator $cast %s", trim( $clause['key'] ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared break; case '!=': case 'NOT EXISTS': $meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key = %s " . $meta_compare_string_end; $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared break; case 'NOT LIKE': $meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key LIKE %s " . $meta_compare_string_end; $meta_compare_value = '%' . $wpdb->esc_like( trim( $clause['key'] ) ) . '%'; $where = $wpdb->prepare( $meta_compare_string, $meta_compare_value ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared break; case 'NOT IN': $array_subclause = '(' . substr( str_repeat( ',%s', count( (array) $clause['key'] ) ), 1 ) . ') '; $meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key IN " . $array_subclause . $meta_compare_string_end; $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared break; case 'NOT REGEXP': $operator = $clause['compare_key']; if ( isset( $clause['type_key'] ) && 'BINARY' === strtoupper( $clause['type_key'] ) ) { $cast = 'BINARY'; } else { $cast = ''; } $meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key REGEXP $cast %s " . $meta_compare_string_end; $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared break; default: $where = ''; break; } return $where; } /** * Generates an SQL WHERE clause for a given meta_query atomic clause based on its meta value. * Adapted from WordPress' `WP_Meta_Query::get_sql_for_clause()` method. * * @param array $clause An atomic meta_query clause. * @return string An SQL WHERE clause or an empty string if $clause is invalid. */ private function generate_where_for_clause_value( $clause ): string { global $wpdb; if ( ! array_key_exists( 'value', $clause ) ) { return ''; } $meta_value = $clause['value']; if ( in_array( $clause['compare'], array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ), true ) ) { if ( ! is_array( $meta_value ) ) { $meta_value = preg_split( '/[,\s]+/', $meta_value ); } } elseif ( is_string( $meta_value ) ) { $meta_value = trim( $meta_value ); } $meta_compare = $clause['compare']; switch ( $meta_compare ) { case 'IN': case 'NOT IN': $where = $wpdb->prepare( '(' . substr( str_repeat( ',%s', count( (array) $meta_value ) ), 1 ) . ')', $meta_value ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared break; case 'BETWEEN': case 'NOT BETWEEN': $where = $wpdb->prepare( '%s AND %s', $meta_value[0], $meta_value[1] ); break; case 'LIKE': case 'NOT LIKE': $where = $wpdb->prepare( '%s', '%' . $wpdb->esc_like( $meta_value ) . '%' ); break; // EXISTS with a value is interpreted as '='. case 'EXISTS': $meta_compare = '='; $where = $wpdb->prepare( '%s', $meta_value ); break; // 'value' is ignored for NOT EXISTS. case 'NOT EXISTS': $where = ''; break; default: $where = $wpdb->prepare( '%s', $meta_value ); break; } if ( $where ) { if ( 'CHAR' === $clause['cast'] ) { return "{$clause['alias']}.meta_value {$meta_compare} {$where}"; } else { return "CAST({$clause['alias']}.meta_value AS {$clause['cast']}) {$meta_compare} {$where}"; } } return ''; } }