Rest，Spring 自己的 OAuth2 服务器 + OAuth2 提供商，如 Facebook、Google、Yahoo

使用Rest和Spring构建自己的OAuth2服务器和OAuth2提供商

java
@SpringBootApplication
@EnableAuthorizationServer
public class OAuth2ServerApplication extends AuthorizationServerConfigurerAdapter {
    public static void main(String[] args) {
        SpringApplication.run(OAuth2ServerApplication.class, args);
    }
    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
            .withClient("client")
            .secret("{noop}secret")
            .authorizedGrantTypes("authorization_code", "refresh_token")
            .scopes("read", "write")
            .redirectUris("http://localhost:8080/callback");
    }
    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints.authenticationManager(authenticationManager);
    }
}

java
@Configuration
@EnableWebSecurity
public class OAuth2ProviderIntegration extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers("/login", "/callback").permitAll()
                .anyRequest().authenticated()
                .and()
            .oauth2Login()
                .loginPage("/login")
                .defaultSuccessUrl("/callback");
    }
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(oauth2AuthenticationProvider());
    }
    @Bean
    public AuthenticationProvider oauth2AuthenticationProvider() {
        OAuth2AuthenticationProvider provider = new OAuth2AuthenticationProvider();
        provider.setAuthoritiesMapper(authoritiesMapper());
        provider.setOAuth2UserService(oauth2UserService());
        return provider;
    }
    @Bean
    public GrantedAuthoritiesMapper authoritiesMapper() {
        return new OAuth2AuthoritiesMapper();
    }
    @Bean
    public OAuth2UserService oauth2UserService() {
        return new OAuth2UserServiceImpl();
    }
}