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id`, * e.g. `customer_checkout_recovery`). Multiple emails can route through the same * table without colliding. * * Stored in a dedicated table (`wp_wc_email_unsubscribes`) rather than user meta * so guest checkouts — common for the abandoned-checkout case — can opt out * without needing a WP_User record. The hash is computed from the lowercased + * trimmed email so casing or whitespace variations resolve to the same row. * * The table is installed via `WC_Install::get_schema()`. `init()` is auto-called * by the container after instantiation; it registers the GDPR personal-data * eraser so the WP "Erase Personal Data" tool clears this table too. * * @internal Just for internal use. * * @since 11.0.0 */ class Storage { /** * The unqualified table name (no `$wpdb->prefix`). */ private const TABLE = 'wc_email_unsubscribes'; /** * Action label stored on the row. Kept as a varchar column rather than a * boolean so we can add further actions (e.g. resubscribed) later without * a schema migration. Today there's only one. */ public const ACTION_UNSUBSCRIBED = 'unsubscribed'; /** * Shape of a valid email hash: 64 lowercase hex chars, matching the output * of `hash('sha256', …)`. Shared with the public unsubscribe endpoint so * the two validation sites can't drift apart. */ public const HASH_PATTERN = '/^[a-f0-9]{64}$/'; /** * Register the GDPR personal-data eraser. * * The table itself is installed via `WC_Install::get_schema()` so it's * present on every site (including the test bootstrap) regardless of * whether the checkout-recovery feature flag is enabled. * * Auto-called by the WC dependency container after instantiation. * * @internal */ final public function init(): void { add_filter( 'wp_privacy_personal_data_erasers', array( $this, 'register_personal_data_eraser' ) ); } /** * Database schema for the unsubscribes table. * * Called from `WC_Install::get_schema()` so the table is created/updated * alongside the rest of WC's tables on activate/upgrade. * * @return string SQL CREATE TABLE statement. */ public function get_database_schema(): string { global $wpdb; $table = $this->get_table_name(); $collate = $wpdb->has_cap( 'collation' ) ? $wpdb->get_charset_collate() : ''; return "CREATE TABLE {$table} ( id bigint(20) unsigned NOT NULL AUTO_INCREMENT, email_hash char(64) NOT NULL, email_kind varchar(64) NOT NULL, action varchar(20) NOT NULL, created_at datetime NOT NULL, PRIMARY KEY (id), KEY email_hash_kind (email_hash, email_kind) ) {$collate};"; } /** * Hash a raw email address for use as the lookup key. * * Normalizes (trim + strtolower) before hashing so equivalent addresses * collide on the same row. Returns an empty string for empty input so * callers can early-out without raising. * * @param string $email Raw email address. * @return string 64-char hex SHA-256 hash, or '' if input was empty. */ public static function hash_email( string $email ): string { $normalized = strtolower( trim( $email ) ); if ( '' === $normalized ) { return ''; } return hash( 'sha256', $normalized ); } /** * Whether the given email is currently unsubscribed from a specific kind. * * @param string $email Raw email address. * @param string $kind Email-kind identifier (the email class's `$this->id`). * @return bool */ public function is_unsubscribed( string $email, string $kind ): bool { $hash = self::hash_email( $email ); if ( '' === $hash || '' === $kind ) { return false; } global $wpdb; $table = $this->get_table_name(); // phpcs:disable WordPress.DB.DirectDatabaseQuery, WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- table name hard-coded above; values bound. $action = $wpdb->get_var( $wpdb->prepare( "SELECT action FROM {$table} WHERE email_hash = %s AND email_kind = %s ORDER BY id DESC LIMIT 1", $hash, $kind ) ); // phpcs:enable return self::ACTION_UNSUBSCRIBED === $action; } /** * Record an unsubscribe for the given email + kind. Idempotent — repeated * calls append new rows but the lookup only cares about the most recent. * * @param string $email Raw email address. * @param string $kind Email-kind identifier. * @return bool True if a row was written, false if input was empty. */ public function mark_unsubscribed( string $email, string $kind ): bool { return $this->record_action( self::hash_email( $email ), $kind, self::ACTION_UNSUBSCRIBED ); } /** * Record an unsubscribe directly by SHA-256 hash, for callers (e.g. the * public unsubscribe endpoint) that operate on the hash already and never * need to handle the raw email. * * Validates the hash matches `HASH_PATTERN` as defense in depth — the * Endpoint already shape-checks the URL value, but any future caller that * forgets to would otherwise insert a junk row. * * @param string $hash SHA-256 hex digest of the normalized email. * @param string $kind Email-kind identifier. * @return bool True if a row was written. */ public function mark_unsubscribed_by_hash( string $hash, string $kind ): bool { if ( 1 !== preg_match( self::HASH_PATTERN, $hash ) ) { return false; } return $this->record_action( $hash, $kind, self::ACTION_UNSUBSCRIBED ); } /** * Remove all rows (across every kind) for an email — used by the GDPR * personal-data eraser so a customer's "right to be forgotten" request * clears their opt-out record along with the rest of their data. * * @param string $email Raw email address. * @return int Number of rows deleted. */ public function erase_for_email( string $email ): int { $hash = self::hash_email( $email ); if ( '' === $hash ) { return 0; } global $wpdb; $table = $this->get_table_name(); // phpcs:disable WordPress.DB.DirectDatabaseQuery, WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- table name hard-coded; hash bound. $deleted = $wpdb->query( $wpdb->prepare( "DELETE FROM {$table} WHERE email_hash = %s", $hash ) ); // phpcs:enable return is_numeric( $deleted ) ? (int) $deleted : 0; } /** * Filter callback that adds this repository's eraser to WP's GDPR registry. * * @internal * * @param array $erasers Existing erasers. * @return array */ public function register_personal_data_eraser( array $erasers ): array { $erasers['wc-email-unsubscribes'] = array( 'eraser_friendly_name' => __( 'WooCommerce Email Unsubscribes', 'woocommerce' ), 'callback' => array( $this, 'handle_personal_data_erasure' ), ); return $erasers; } /** * Callback for the WP personal-data eraser. * * @internal * * @param string $email Email address being erased. * @return array{items_removed: bool, items_retained: bool, messages: string[], done: bool} */ public function handle_personal_data_erasure( string $email ): array { $removed = $this->erase_for_email( $email ) > 0; return array( 'items_removed' => $removed, 'items_retained' => false, 'messages' => array(), 'done' => true, ); } /** * Append an action row. * * @param string $hash SHA-256 hex digest of the normalized email. * @param string $kind Email-kind identifier. * @param string $action `unsubscribed` or `resubscribed`. * @return bool */ private function record_action( string $hash, string $kind, string $action ): bool { if ( '' === $hash || '' === $kind ) { return false; } global $wpdb; // phpcs:disable WordPress.DB.DirectDatabaseQuery -- write to an internal preference table. $inserted = $wpdb->insert( $this->get_table_name(), array( 'email_hash' => $hash, 'email_kind' => $kind, 'action' => $action, 'created_at' => current_time( 'mysql', true ), ), array( '%s', '%s', '%s', '%s' ) ); // phpcs:enable return false !== $inserted; } /** * Fully-qualified table name including the wpdb prefix. */ private function get_table_name(): string { global $wpdb; return $wpdb->prefix . self::TABLE; } }