+/**
+ * Retrieves a user row based on password reset key and login
+ *
+ * A key is considered 'expired' if it exactly matches the value of the
+ * user_activation_key field, rather than being matched after going through the
+ * hashing process. This field is now hashed; old values are no longer accepted
+ * but have a different WP_Error code so good user feedback can be provided.
+ *
+ * @uses $wpdb WordPress Database object
+ *
+ * @param string $key Hash to validate sending user's password.
+ * @param string $login The user login.
+ * @return WP_User|WP_Error WP_User object on success, WP_Error object for invalid or expired keys.
+ */
+function check_password_reset_key($key, $login) {
+ global $wpdb, $wp_hasher;
+
+ $key = preg_replace('/[^a-z0-9]/i', '', $key);
+
+ if ( empty( $key ) || !is_string( $key ) )
+ return new WP_Error('invalid_key', __('Invalid key'));
+
+ if ( empty($login) || !is_string($login) )
+ return new WP_Error('invalid_key', __('Invalid key'));
+
+ $row = $wpdb->get_row( $wpdb->prepare( "SELECT ID, user_activation_key FROM $wpdb->users WHERE user_login = %s", $login ) );
+ if ( ! $row )
+ return new WP_Error('invalid_key', __('Invalid key'));
+
+ if ( empty( $wp_hasher ) ) {
+ require_once ABSPATH . 'wp-includes/class-phpass.php';
+ $wp_hasher = new PasswordHash( 8, true );
+ }
+
+ if ( $wp_hasher->CheckPassword( $key, $row->user_activation_key ) )
+ return get_userdata( $row->ID );
+
+ if ( $key === $row->user_activation_key ) {
+ $return = new WP_Error( 'expired_key', __( 'Invalid key' ) );
+ $user_id = $row->ID;
+
+ /**
+ * Filter the return value of check_password_reset_key() when an
+ * old-style key is used (plain-text key was stored in the database).
+ *
+ * @since 3.7.0
+ *
+ * @param WP_Error $return A WP_Error object denoting an expired key.
+ * Return a WP_User object to validate the key.
+ * @param int $user_id The matched user ID.
+ */
+ return apply_filters( 'password_reset_key_expired', $return, $user_id );
+ }
+
+ return new WP_Error( 'invalid_key', __( 'Invalid key' ) );
+}
+
+/**
+ * Handles resetting the user's password.
+ *
+ * @param object $user The user
+ * @param string $new_pass New password for the user in plaintext
+ */
+function reset_password( $user, $new_pass ) {
+ do_action( 'password_reset', $user, $new_pass );
+
+ wp_set_password( $new_pass, $user->ID );
+ update_user_option( $user->ID, 'default_password_nag', false, true );
+
+ wp_password_change_notification( $user );
+}
+
+/**
+ * Handles registering a new user.
+ *
+ * @param string $user_login User's username for logging in
+ * @param string $user_email User's email address to send password and add
+ * @return int|WP_Error Either user's ID or error on failure.
+ */
+function register_new_user( $user_login, $user_email ) {
+ $errors = new WP_Error();
+
+ $sanitized_user_login = sanitize_user( $user_login );
+ $user_email = apply_filters( 'user_registration_email', $user_email );
+
+ // Check the username
+ if ( $sanitized_user_login == '' ) {
+ $errors->add( 'empty_username', __( '<strong>ERROR</strong>: Please enter a username.' ) );
+ } elseif ( ! validate_username( $user_login ) ) {
+ $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) );
+ $sanitized_user_login = '';
+ } elseif ( username_exists( $sanitized_user_login ) ) {
+ $errors->add( 'username_exists', __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' ) );
+ }
+
+ // Check the e-mail address
+ if ( $user_email == '' ) {
+ $errors->add( 'empty_email', __( '<strong>ERROR</strong>: Please type your e-mail address.' ) );
+ } elseif ( ! is_email( $user_email ) ) {
+ $errors->add( 'invalid_email', __( '<strong>ERROR</strong>: The email address isn’t correct.' ) );
+ $user_email = '';
+ } elseif ( email_exists( $user_email ) ) {
+ $errors->add( 'email_exists', __( '<strong>ERROR</strong>: This email is already registered, please choose another one.' ) );
+ }
+
+ do_action( 'register_post', $sanitized_user_login, $user_email, $errors );
+
+ $errors = apply_filters( 'registration_errors', $errors, $sanitized_user_login, $user_email );
+
+ if ( $errors->get_error_code() )
+ return $errors;
+
+ $user_pass = wp_generate_password( 12, false );
+ $user_id = wp_create_user( $sanitized_user_login, $user_pass, $user_email );
+ if ( ! $user_id || is_wp_error( $user_id ) ) {
+ $errors->add( 'registerfail', sprintf( __( '<strong>ERROR</strong>: Couldn’t register you… please contact the <a href="mailto:%s">webmaster</a> !' ), get_option( 'admin_email' ) ) );
+ return $errors;
+ }
+
+ update_user_option( $user_id, 'default_password_nag', true, true ); //Set up the Password change nag.
+
+ wp_new_user_notification( $user_id, $user_pass );
+
+ return $user_id;
+}