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auth_redirect [ ]

auth_redirect ( No parameters )
Defined at:
Codex



Checks if a user is logged in, if not it redirects them to the login page.

Source 

function auth_redirect() {
	// Checks if a user is logged in, if not redirects them to the login page

	$secure = ( is_ssl() || force_ssl_admin() );

	$secure = apply_filters('secure_auth_redirect', $secure);

	// If https is required and request is http, redirect
	if ( $secure && !is_ssl() && false !== strpos($_SERVER['REQUEST_URI'], 'wp-admin') ) {
		if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
			wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) );
			exit();
		} else {
			wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
			exit();
		}
	}

	if ( is_user_admin() )
		$scheme = 'logged_in';
	else
		$scheme = apply_filters( 'auth_redirect_scheme', '' );

	if ( $user_id = wp_validate_auth_cookie( '',  $scheme) ) {
		do_action('auth_redirect', $user_id);

		// If the user wants ssl but the session is not ssl, redirect.
		if ( !$secure && get_user_option('use_ssl', $user_id) && false !== strpos($_SERVER['REQUEST_URI'], 'wp-admin') ) {
			if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
				wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) );
				exit();
			} else {
				wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
				exit();
			}
		}

		return;  // The cookie is good so we're done
	}

	// The cookie is no good so force login
	nocache_headers();

	$redirect = ( strpos( $_SERVER['REQUEST_URI'], '/options.php' ) && wp_get_referer() ) ? wp_get_referer() : set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );

	$login_url = wp_login_url($redirect, true);

	wp_redirect($login_url);
	exit();
}

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