Usando anotação e configuração de java, não está claro para mim como registrar um filtro substituído para segurança de mola.

O que eu quero alcançar é fazer um login automático sem mostrar um formulário de Login, pois nesse momento o usuário já estará autenticado. Portanto, apenas leremos um parâmetro de cabeçalho e usaremos a segurança de mola para fins de autorização.

Esta é uma versão simplificada do que estou tentando, e a segurança do Spring funciona corretamente, exceto às vezes mostrando a tela de login. Bootstrapping o BypassLoginFilter é tudo que eu preciso para isso. Leia também em algum lugar que a configuração automática de http deve estar desativada para esse tipo de comportamento, mas não tenho certeza de como implementar na configuração do java puro.

SecurityWebApplicationInitializer.java

import org.springframework.security.web.context.AbstractSecurityWebApplicationInitializer;

public class SecurityWebApplicationInitializer extends AbstractSecurityWebApplicationInitializer{

}

SecurityConfig .java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.web.authentication.logout.LogoutFilter;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(securedEnabled=true, prePostEnabled=true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/resources/**");    
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable();
        http.authorizeRequests().antMatchers("/*").permitAll()
                .anyRequest().hasRole("USER").and()
                .formLogin()
                .permitAll();
        http.addFilterBefore(new BypassLoginFilter(), LogoutFilter.class);
        //.and().anonymous().disable();
    }

    @Override
    @Autowired
    protected void registerAuthentication(AuthenticationManagerBuilder auth) {
        try {
            auth.inMemoryAuthentication().withUser("user").password("password")
            .roles("USER").and().withUser("admin").password("password")
            .roles("USER", "ADMIN");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

BypassLoginFilter.java

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter;
import org.springframework.security.web.authentication.preauth.PreAuthenticatedAuthenticationToken;

public class BypassLoginFilter extends AbstractAuthenticationProcessingFilter{

    private static String HEADER_IS_ADMIN = "isAdmin";

    public BypassLoginFilter()
    {
        super("/*");
    }

        //Never gets executed
    @Override
    public Authentication attemptAuthentication(HttpServletRequest request,
            HttpServletResponse response) throws AuthenticationException,
            IOException, ServletException {

        boolean isAdmin = Boolean.valueOf(request.getHeader(HEADER_IS_ADMIN));

        PreAuthenticatedAuthenticationToken authRequest = new PreAuthenticatedAuthenticationToken("","",getAuthorities(isAdmin));
        authRequest.setDetails(authenticationDetailsSource.buildDetails(request));

        return getAuthenticationManager().authenticate(authRequest);
    }

    private List<GrantedAuthority> getAuthorities(boolean isAdmin)
    {
        List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>();

        authorities.add(new SimpleGrantedAuthority("ROLE_USER"));
        if(isAdmin){
            authorities.add(new SimpleGrantedAuthority("ROLE_ADMIN"));
        }
        return authorities;
    }
}