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| 1 | <?php |
| 2 | /** |
| 3 | * Table Checksums Class. |
| 4 | * |
| 5 | * @package automattic/jetpack-sync |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Sync\Replicastore; |
| 9 | |
| 10 | use Exception; |
| 11 | |
| 12 | if ( ! defined( 'ABSPATH' ) ) { |
| 13 | exit( 0 ); |
| 14 | } |
| 15 | |
| 16 | /** |
| 17 | * Class to handle Table Checksums for the Users table. |
| 18 | */ |
| 19 | class Table_Checksum_Users extends Table_Checksum { |
| 20 | |
| 21 | /** |
| 22 | * Returns the checksum query. All validation of fields and configurations are expected to occur prior to usage. |
| 23 | * |
| 24 | * @param int|null $range_from The start of the range. |
| 25 | * @param int|null $range_to The end of the range. |
| 26 | * @param array|null $filter_values Additional filter values. Not used at the moment. |
| 27 | * @param bool $granular_result If the function should return a granular result. |
| 28 | * |
| 29 | * @return string |
| 30 | * |
| 31 | * @throws Exception Throws an exception if validation fails in the internal function calls. |
| 32 | */ |
| 33 | protected function build_checksum_query( $range_from = null, $range_to = null, $filter_values = null, $granular_result = false ) { |
| 34 | global $wpdb; |
| 35 | |
| 36 | // Escape the salt. |
| 37 | $salt = $wpdb->prepare( '%s', $this->salt ); |
| 38 | |
| 39 | // Prepare the compound key. |
| 40 | $key_fields = array(); |
| 41 | |
| 42 | // Prefix the fields with the table name, to avoid clashes in queries with sub-queries (e.g. meta tables). |
| 43 | foreach ( $this->key_fields as $field ) { |
| 44 | $key_fields[] = $this->table . '.' . $field; |
| 45 | } |
| 46 | |
| 47 | $key_fields = implode( ',', $key_fields ); |
| 48 | |
| 49 | // Prepare the checksum fields. |
| 50 | $checksum_fields = array(); |
| 51 | // Prefix the fields with the table name, to avoid clashes in queries with sub-queries (e.g. meta tables). |
| 52 | foreach ( $this->checksum_fields as $field ) { |
| 53 | $checksum_fields[] = $this->table . '.' . $field; |
| 54 | } |
| 55 | // Apply latin1 conversion if enabled. |
| 56 | if ( $this->perform_text_conversion ) { |
| 57 | // Convert text fields to allow for encoding discrepancies as WP.com is latin1. |
| 58 | foreach ( $this->checksum_text_fields as $field ) { |
| 59 | $checksum_fields[] = 'CONVERT(' . $this->table . '.' . $field . ' using latin1 )'; |
| 60 | } |
| 61 | } else { |
| 62 | // Conversion disabled, default to table prefixing. |
| 63 | foreach ( $this->checksum_text_fields as $field ) { |
| 64 | $checksum_fields[] = $this->table . '.' . $field; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | $checksum_fields_string = implode( ',', array_merge( $checksum_fields, array( $salt ) ) ); |
| 69 | |
| 70 | $additional_fields = ''; |
| 71 | if ( $granular_result ) { |
| 72 | // TODO uniq the fields as sometimes(most) range_index is the key and there's no need to select the same field twice. |
| 73 | $additional_fields = " |
| 74 | {$this->table}.{$this->range_field} as range_index, |
| 75 | {$key_fields}, |
| 76 | "; |
| 77 | } |
| 78 | |
| 79 | $filter_stamenet = $this->build_filter_statement( $range_from, $range_to, $filter_values ); |
| 80 | |
| 81 | // usermeta join to limit on user_level. |
| 82 | $join_statement = "JOIN {$wpdb->usermeta} as um_table ON um_table.user_id = {$this->table}.ID"; |
| 83 | |
| 84 | $query = " |
| 85 | SELECT |
| 86 | {$additional_fields} |
| 87 | SUM( |
| 88 | CRC32( |
| 89 | CONCAT_WS( '#', {$salt}, {$checksum_fields_string} ) |
| 90 | ) |
| 91 | ) AS checksum |
| 92 | FROM |
| 93 | {$this->table} |
| 94 | {$join_statement} |
| 95 | WHERE |
| 96 | {$filter_stamenet} |
| 97 | AND um_table.meta_key = '{$wpdb->prefix}user_level' |
| 98 | AND um_table.meta_value > 0 |
| 99 | "; |
| 100 | |
| 101 | /** |
| 102 | * We need the GROUP BY only for compound keys. |
| 103 | */ |
| 104 | if ( $granular_result ) { |
| 105 | $query .= " |
| 106 | GROUP BY {$key_fields} |
| 107 | LIMIT 9999999 |
| 108 | "; |
| 109 | } |
| 110 | |
| 111 | return $query; |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Obtain the min-max values (edges) of the range. |
| 116 | * |
| 117 | * @param int|null $range_from The start of the range. |
| 118 | * @param int|null $range_to The end of the range. |
| 119 | * @param int|null $limit How many values to return. |
| 120 | * |
| 121 | * @return array|object|void |
| 122 | * @throws Exception Throws an exception if validation fails on the internal function calls. |
| 123 | */ |
| 124 | public function get_range_edges( $range_from = null, $range_to = null, $limit = null ) { |
| 125 | global $wpdb; |
| 126 | |
| 127 | $this->validate_fields( array( $this->range_field ) ); |
| 128 | |
| 129 | // `trim()` to make sure we don't add the statement if it's empty. |
| 130 | $filters = trim( $this->build_filter_statement( $range_from, $range_to ) ); |
| 131 | |
| 132 | $filter_statement = ''; |
| 133 | if ( ! empty( $filters ) ) { |
| 134 | $filter_statement = " |
| 135 | JOIN {$wpdb->usermeta} as um_table ON um_table.user_id = {$this->table}.ID |
| 136 | WHERE |
| 137 | {$filters} |
| 138 | AND um_table.meta_key = '{$wpdb->prefix}user_level' |
| 139 | AND um_table.meta_value > 0 |
| 140 | "; |
| 141 | } |
| 142 | |
| 143 | $query = " |
| 144 | SELECT |
| 145 | MIN({$this->range_field}) as min_range, |
| 146 | MAX({$this->range_field}) as max_range, |
| 147 | COUNT( {$this->range_field} ) as item_count |
| 148 | FROM |
| 149 | "; |
| 150 | |
| 151 | /** |
| 152 | * If `$limit` is not specified, we can directly use the table. |
| 153 | */ |
| 154 | if ( ! $limit ) { |
| 155 | $query .= " |
| 156 | {$this->table} |
| 157 | {$filter_statement} |
| 158 | "; |
| 159 | } else { |
| 160 | /** |
| 161 | * If there is `$limit` specified, we can't directly use `MIN/MAX()` as they don't work with `LIMIT`. |
| 162 | * That's why we will alter the query for this case. |
| 163 | */ |
| 164 | $limit = intval( $limit ); |
| 165 | |
| 166 | $query .= " |
| 167 | ( |
| 168 | SELECT |
| 169 | {$this->range_field} |
| 170 | FROM |
| 171 | {$this->table} |
| 172 | {$filter_statement} |
| 173 | ORDER BY |
| 174 | {$this->range_field} ASC |
| 175 | LIMIT {$limit} |
| 176 | ) as ids_query |
| 177 | "; |
| 178 | } |
| 179 | |
| 180 | // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared |
| 181 | $result = $wpdb->get_row( $query, ARRAY_A ); |
| 182 | |
| 183 | if ( ! $result || ! is_array( $result ) ) { |
| 184 | throw new Exception( 'Unable to get range edges' ); |
| 185 | } |
| 186 | |
| 187 | return $result; |
| 188 | } |
| 189 | } |