woocommerce/shortcodes/shortcode-lost_password.php

<?php
/**
 * Lost Password Shortcode
 *
 * Displays the lost password / reset password forms
 *
 * @author 		WooThemes
 * @category 	Shortcodes
 * @package 	WooCommerce/Shortcodes/Lost Password
 * @version     1.7.0
 */

/**
 * Get the lost password shortcode content.
 *
 * @access public
 * @return string
 */
function get_woocommerce_lost_password() {
	global $woocommerce;
	return $woocommerce->shortcode_wrapper( 'woocommerce_lost_password' );
}

/**
 * Output the lost password shortcode.
 *
 * @access public
 * @return void
 */
function woocommerce_lost_password() {
	global $woocommerce;

	$woocommerce->nocache();

	global $post;

	// arguments to pass to template
	$args = array( 'form' => 'lost_password' );

	// process lost password form
	if( isset( $_POST['user_login'] ) ) {

		$woocommerce->verify_nonce( 'lost_password' );

		woocommerce_retrieve_password();
	}

	// process reset key / login from email confirmation link
	if( isset( $_GET['key'] ) && isset( $_GET['login'] ) ) {

		$user = woocommerce_check_password_reset_key( $_GET['key'], $_GET['login'] );

		// reset key / login is correct, display reset password form with hidden key / login values
		if( is_object( $user ) ) {
			$args['form'] = 'reset_password';
			$args['key'] = esc_attr( $_GET['key'] );
			$args['login'] = esc_attr( $_GET['login'] );
		}
	}

	// process reset password form
	if( isset( $_POST['password_1'] ) && isset( $_POST['password_2'] ) && isset( $_POST['reset_key'] ) && isset( $_POST['reset_login'] ) ) :

		// verify reset key again
		$user = woocommerce_check_password_reset_key( $_POST['reset_key'], $_POST['reset_login'] );

		if( is_object( $user ) ) {

			// save these values into the form again in case of errors
			$args['key'] = esc_attr( $_POST['reset_key'] );
			$args['login'] = esc_attr( $_POST['reset_login'] );

			$woocommerce->verify_nonce( 'reset_password' );

			if( empty( $_POST['password_1'] ) || empty( $_POST['password_2'] ) ) {
				$woocommerce->add_error( __( 'Please enter your password.', 'woocommerce' ) );
				$args['form'] = 'reset_password';
			}

			if( $_POST[ 'password_1' ] !== $_POST[ 'password_2' ] ) {
				$woocommerce->add_error( __('Passwords do not match.', 'woocommerce') );
				$args['form'] = 'reset_password';
			}

			if( 0 == $woocommerce->error_count() && ( $_POST['password_1'] == $_POST['password_2'] ) ) {

				woocommerce_reset_password( $user, esc_attr( $_POST['password_1'] ) );

				do_action( 'woocommerce_customer_reset_password', $user );

				$woocommerce->add_message( __( 'Your password has been reset.', 'woocommerce' ) . ' <a href="' . get_permalink( woocommerce_get_page_id( 'myaccount' ) ) . '">' . __( 'Log in', 'woocommerce' ) . '</a>' );
			}
		}

	endif;

	woocommerce_get_template( 'myaccount/form-lost-password.php', $args );
}

/**
 * Handles sending password retrieval email to customer.
 *
 * @access public
 * @uses $wpdb WordPress Database object
 * @return bool True: when finish. False: on error
 */
function woocommerce_retrieve_password() {
	global $woocommerce,$wpdb;

	if ( empty( $_POST['user_login'] ) ) {

		$woocommerce->add_error( __( 'Enter a username or e-mail address.', 'woocommerce' ) );

	} elseif ( strpos( $_POST['user_login'], '@' ) ) {

		$user_data = get_user_by( 'email', trim( $_POST['user_login'] ) );

		if ( empty( $user_data ) )
			$woocommerce->add_error( __( 'There is no user registered with that email address.', 'woocommerce' ) );

	} else {

		$login = trim( $_POST['user_login'] );

		$user_data = get_user_by('login', $login );
	}

	do_action('lostpassword_post');

	if( $woocommerce->error_count() > 0 )
		return false;

	if ( ! $user_data ) {
		$woocommerce->add_error( __( 'Invalid username or e-mail.', 'woocommerce' ) );
		return false;
	}

	// redefining user_login ensures we return the right case in the email
	$user_login = $user_data->user_login;
	$user_email = $user_data->user_email;

	do_action('retrieve_password', $user_login);

	$allow = apply_filters('allow_password_reset', true, $user_data->ID);

	if ( ! $allow ) {

		$woocommerce->add_error( __( 'Password reset is not allowed for this user') );

		return false;

	} elseif ( is_wp_error( $allow ) ) {

		$woocommerce->add_error( $allow->get_error_message );

		return false;
	}

	$key = $wpdb->get_var( $wpdb->prepare( "SELECT user_activation_key FROM $wpdb->users WHERE user_login = %s", $user_login ) );

	if ( empty( $key ) ) {

		// Generate something random for a key...
		$key = wp_generate_password( 20, false );

		do_action('retrieve_password_key', $user_login, $key);

		// Now insert the new md5 key into the db
		$wpdb->update( $wpdb->users, array( 'user_activation_key' => $key ), array( 'user_login' => $user_login ) );
	}

	// Send email notification
	$mailer = $woocommerce->mailer();
	do_action( 'woocommerce_reset_password_notification', $user_login, $key );

	$woocommerce->add_message( __( 'Check your e-mail for the confirmation link.' ) );
	return true;
}

/**
 * Retrieves a user row based on password reset key and login
 *
 * @uses $wpdb WordPress Database object
 *
 * @access public
 * @param string $key Hash to validate sending user's password
 * @param string $login The user login
 * @return object|bool User's database row on success, false for invalid keys
 */
function woocommerce_check_password_reset_key( $key, $login ) {
	global $woocommerce,$wpdb;

	$key = preg_replace( '/[^a-z0-9]/i', '', $key );

	if ( empty( $key ) || ! is_string( $key ) ) {
		$woocommerce->add_error( __( 'Invalid key', 'woocommerce' ) );
		return false;
	}

	if ( empty( $login ) || ! is_string( $login ) ) {
		$woocommerce->add_error( __( 'Invalid key', 'woocommerce' ) );
		return false;
	}

	$user = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->users WHERE user_activation_key = %s AND user_login = %s", $key, $login ) );

	if ( empty( $user ) ) {
		$woocommerce->add_error( __( 'Invalid key', 'woocommerce' ) );
		return false;
	}

	return $user;
}

/**
 * Handles resetting the user's password.
 *
 * @access public
 * @param object $user The user
 * @param string $new_pass New password for the user in plaintext
 * @return void
 */
function woocommerce_reset_password( $user, $new_pass ) {
	do_action( 'password_reset', $user, $new_pass );

	wp_set_password( $new_pass, $user->ID );

	wp_password_change_notification( $user );
}