SpringSecurityUserContext.java 文件源码

/**
     * Get the {@link CalendarUser} by obtaining the currently logged in Spring Security user's
     * {@link Authentication#getName()} and using that to find the {@link CalendarUser} by email address (since for our
     * application Spring Security usernames are email addresses).
     */
    @Override
    public CalendarUser getCurrentUser() {
        SecurityContext context = SecurityContextHolder.getContext();
        Authentication authentication = context.getAuthentication();
        if (authentication == null) {
            return null;
        }

        User user = (User)authentication.getPrincipal();
        String email = user.getUsername();
//        String email = user.getEmail();
        if (email == null) {
            return null;
        }
        CalendarUser result = calendarService.findUserByEmail(email);
        if (result == null) {
            throw new IllegalStateException(
                    "Spring Security is not in synch with CalendarUsers. Could not find user with email " + email);
        }
        return result;
    }