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| 1 | <?php |
| 2 | /** |
| 3 | * Uses a custom db table (as distinct from transients) to store the autologin codes. |
| 4 | * |
| 5 | * @link https://BrianHenry.ie |
| 6 | * @since 1.2.1 |
| 7 | * |
| 8 | * @package brianhenryie/bh-wp-autologin-urls |
| 9 | */ |
| 10 | |
| 11 | namespace BrianHenryIE\WP_Autologin_URLs\API\Data_Stores; |
| 12 | |
| 13 | use BrianHenryIE\WP_Autologin_URLs\API\Data_Store_Interface; |
| 14 | use DateInterval; |
| 15 | use DateTime; |
| 16 | use DateTimeImmutable; |
| 17 | use DateTimeInterface; |
| 18 | use DateTimeZone; |
| 19 | use Exception; |
| 20 | use Psr\Log\LoggerInterface; |
| 21 | use Psr\Log\LoggerAwareTrait; |
| 22 | |
| 23 | /** |
| 24 | * Creates a custom database table via standard $wpdb functions to store and retrieve the autologin codes. |
| 25 | * |
| 26 | * phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery |
| 27 | */ |
| 28 | class DB_Data_Store implements Data_Store_Interface { |
| 29 | use LoggerAwareTrait; |
| 30 | |
| 31 | /** |
| 32 | * Constructor. |
| 33 | * |
| 34 | * @param LoggerInterface $logger A PSR logger. |
| 35 | */ |
| 36 | public function __construct( LoggerInterface $logger ) { |
| 37 | $this->setLogger( $logger ); |
| 38 | |
| 39 | add_action( 'plugins_loaded', array( $this, 'create_db' ), 1 ); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * The current plugin database version. |
| 44 | * |
| 45 | * @var int |
| 46 | */ |
| 47 | protected static $db_version = 1; |
| 48 | |
| 49 | /** |
| 50 | * Option name in wp_options for checking the database version on install/upgrades. |
| 51 | * |
| 52 | * @var string |
| 53 | */ |
| 54 | public static $db_version_option_name = 'bh_wp_autologin_urls_db_version'; |
| 55 | |
| 56 | /** |
| 57 | * Create or upgrade the database. |
| 58 | * |
| 59 | * Check the saved wp_option for the last time the database was created and update accordingly. |
| 60 | * |
| 61 | * @hooked plugins_loaded |
| 62 | */ |
| 63 | public function create_db(): void { |
| 64 | |
| 65 | $current_db_version = get_option( self::$db_version_option_name, 0 ); |
| 66 | |
| 67 | if ( ! ( self::$db_version > $current_db_version ) ) { |
| 68 | return; |
| 69 | } |
| 70 | |
| 71 | global $wpdb; |
| 72 | |
| 73 | $table_name = $wpdb->prefix . 'autologin_urls'; |
| 74 | $charset_collate = $wpdb->get_charset_collate(); |
| 75 | |
| 76 | $sql = "CREATE TABLE {$table_name} ( |
| 77 | expires_at datetime DEFAULT '0000-00-00 00:00:00' NOT NULL, |
| 78 | hash varchar(64) NOT NULL, |
| 79 | userhash varchar(64) NOT NULL, |
| 80 | PRIMARY KEY (hash), |
| 81 | KEY expires_at (expires_at) |
| 82 | ) {$charset_collate};"; |
| 83 | |
| 84 | require_once ABSPATH . 'wp-admin/includes/upgrade.php'; |
| 85 | $result = dbDelta( $sql ); |
| 86 | |
| 87 | update_option( self::$db_version_option_name, self::$db_version ); |
| 88 | |
| 89 | $this->logger->info( 'Updated database to version ' . self::$db_version ); |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Save an autologin code for a user so it can be checked in future, before the expires_in time. |
| 94 | * |
| 95 | * @param int $user_id The user id the code is being saved for. |
| 96 | * @param string $code The autologin code being used in the user's URL. |
| 97 | * @param int $expires_in Number of seconds the code is valid for. |
| 98 | * |
| 99 | * @throws Exception DateTime exception. |
| 100 | * @throws Exception For `$wpdb->last_error`. |
| 101 | */ |
| 102 | public function save( int $user_id, string $code, int $expires_in ): void { |
| 103 | |
| 104 | $key = hash( 'sha256', $code ); |
| 105 | |
| 106 | // Concatenate $user_id and $password so the database cannot be searched by username. |
| 107 | $value = hash( 'sha256', $user_id . $code ); |
| 108 | |
| 109 | global $wpdb; |
| 110 | |
| 111 | $datetime = new DateTime( 'now', new DateTimeZone( 'UTC' ) ); |
| 112 | $datetime->add( new DateInterval( "PT{$expires_in}S" ) ); |
| 113 | $expires_at = $datetime->format( 'Y-m-d H:i:s' ); |
| 114 | |
| 115 | $result = $wpdb->insert( |
| 116 | $wpdb->prefix . 'autologin_urls', |
| 117 | array( |
| 118 | 'expires_at' => $expires_at, |
| 119 | 'hash' => $key, |
| 120 | 'userhash' => $value, |
| 121 | ) |
| 122 | ); |
| 123 | |
| 124 | if ( ! empty( $wpdb->last_error ) ) { |
| 125 | $this->logger->error( $wpdb->last_error ); |
| 126 | throw new Exception( $wpdb->last_error ); |
| 127 | } |
| 128 | |
| 129 | if ( false === $result ) { |
| 130 | $this->logger->error( |
| 131 | 'Error saving autologin code for wp_user:' . $user_id, |
| 132 | array( |
| 133 | 'user_id' => $user_id, |
| 134 | 'code' => $code, |
| 135 | 'expires_in' => $expires_in, |
| 136 | 'expires_at' => $expires_at, |
| 137 | 'hash' => $key, |
| 138 | 'userhash' => $value, |
| 139 | ) |
| 140 | ); |
| 141 | return; |
| 142 | } |
| 143 | |
| 144 | $this->logger->debug( |
| 145 | 'Saved autologin code for wp_user:' . $user_id, |
| 146 | array( |
| 147 | 'user_id' => $user_id, |
| 148 | 'expires' => $expires_at, |
| 149 | ) |
| 150 | ); |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Retrieve the value stored for the given autologin code, if it has not expired. |
| 155 | * |
| 156 | * @param string $code The autologin code in the user's URL. |
| 157 | * @param bool $delete Delete the code after fetching it. I.e. this is a single use code. |
| 158 | * |
| 159 | * @return string|null |
| 160 | * @throws Exception DateTime exception. |
| 161 | * @throws Exception For `$wpdb->last_error`. |
| 162 | */ |
| 163 | public function get_value_for_code( string $code, bool $delete = true ): ?string { |
| 164 | |
| 165 | global $wpdb; |
| 166 | |
| 167 | $key = hash( 'sha256', $code ); |
| 168 | |
| 169 | /** |
| 170 | * We've no interest in caching, rather, for security, we're deleting the entry as soon as it's found. |
| 171 | * phpcs:disable WordPress.DB.DirectDatabaseQuery.NoCaching |
| 172 | */ |
| 173 | $result = $wpdb->get_row( |
| 174 | $wpdb->prepare( 'SELECT expires_at, userhash FROM ' . $wpdb->prefix . 'autologin_urls WHERE hash = %s', $key ) |
| 175 | ); |
| 176 | |
| 177 | if ( ! empty( $wpdb->last_error ) ) { |
| 178 | $this->logger->error( $wpdb->last_error ); |
| 179 | throw new Exception( $wpdb->last_error ); |
| 180 | } |
| 181 | |
| 182 | if ( is_null( $result ) ) { |
| 183 | $this->logger->debug( 'Code not found.' ); |
| 184 | return null; |
| 185 | } |
| 186 | |
| 187 | // Delete the code so it can only be used once (whether valid or not). |
| 188 | if ( $delete ) { |
| 189 | $wpdb->delete( |
| 190 | $wpdb->prefix . 'autologin_urls', |
| 191 | array( 'hash' => $key ) |
| 192 | ); |
| 193 | } |
| 194 | |
| 195 | $expires_at = new DateTimeImmutable( $result->expires_at, new DateTimeZone( 'UTC' ) ); |
| 196 | |
| 197 | $now = new DateTimeImmutable( 'now', new DateTimeZone( 'UTC' ) ); |
| 198 | |
| 199 | if ( $now > $expires_at ) { |
| 200 | $this->logger->debug( |
| 201 | 'Valid code but already expired', |
| 202 | array( |
| 203 | 'code' => $code, |
| 204 | 'expires_at' => $expires_at, |
| 205 | 'hash' => $key, |
| 206 | ) |
| 207 | ); |
| 208 | return null; |
| 209 | } |
| 210 | |
| 211 | return $result->userhash; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Delete codes that are no longer valid. |
| 216 | * |
| 217 | * @param DateTimeInterface $before The date from which to purge old codes. |
| 218 | * |
| 219 | * @return array{deleted_count:int|null} |
| 220 | * @throws Exception For `$wpdb->last_error`. |
| 221 | */ |
| 222 | public function delete_expired_codes( DateTimeInterface $before ): array { |
| 223 | |
| 224 | // get current datetime in mysql format. |
| 225 | $mysql_formatted_date = $before->format( 'Y-m-d H:i:s' ); |
| 226 | |
| 227 | global $wpdb; |
| 228 | $result = $wpdb->query( $wpdb->prepare( 'DELETE FROM ' . $wpdb->prefix . 'autologin_urls WHERE expires_at < %s', $mysql_formatted_date ) ); |
| 229 | |
| 230 | if ( ! empty( $wpdb->last_error ) ) { |
| 231 | $this->logger->error( $wpdb->last_error ); |
| 232 | throw new Exception( $wpdb->last_error ); |
| 233 | } |
| 234 | |
| 235 | // I think this is the number of entries deleted. |
| 236 | $this->logger->info( 'Delete expired codes wpdb result: ' . $result, array( 'result' => $result ) ); |
| 237 | |
| 238 | return array( 'deleted_count' => intval( $result ) ); |
| 239 | } |
| 240 | } |