CORS

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Spring Framework 为 CORS 提供了一流的支持。CORS 必须在 Spring Security 之前处理，因为预检请求不包含任何 cookie（即 JSESSIONID）。如果请求不包含任何 cookie，且 Spring Security 在先，则请求会被判定为用户未通过身份验证（因为请求中没有cookie），并拒绝该请求。

确保首先处理 CORS 的最简单方法是使用 CorsFilter。用户可通过提供 CorsConfigurationSource 将 CorsFilter 与 Spring Security 集成。例如，下面将在 Spring Security 中集成 CORS 支持：

Java
Kotlin

@Bean
CorsConfigurationSource corsConfigurationSource() {
    CorsConfiguration configuration = new CorsConfiguration();
    configuration.setAllowedOrigins(Arrays.asList("https://example.com"));
    configuration.setAllowedMethods(Arrays.asList("GET","POST"));
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    source.registerCorsConfiguration("/**", configuration);
    return source;
}

@Bean
fun corsConfigurationSource(): CorsConfigurationSource {
    val configuration = CorsConfiguration()
    configuration.allowedOrigins = listOf("https://example.com")
    configuration.allowedMethods = listOf("GET", "POST")
    val source = UrlBasedCorsConfigurationSource()
    source.registerCorsConfiguration("/**", configuration)
    return source
}

下面的列表用XML做了同样的事情：

<http>
	<cors configuration-source-ref="corsSource"/>
	...
</http>
<b:bean id="corsSource" class="org.springframework.web.cors.UrlBasedCorsConfigurationSource">
	...
</b:bean>

如果你使用 Spring MVC 的 CORS 支持，你可以省略指定 CorsConfigurationSource，Spring Security 将使用提供给 Spring MVC 的 CORS 配置：

Java
Kotlin

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			// if Spring MVC is on classpath and no CorsConfigurationSource is provided,
			// Spring Security will use CORS configuration provided to Spring MVC
			.cors(withDefaults())
			...
		return http.build();
	}
}

@Configuration
@EnableWebSecurity
open class WebSecurityConfig {
    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            // if Spring MVC is on classpath and no CorsConfigurationSource is provided,
            // Spring Security will use CORS configuration provided to Spring MVC
            cors { }
            // ...
        }
        return http.build()
    }
}

下面的列表用XML做了同样的事情：

<http>
	<!-- Default to Spring MVC's CORS configuration -->
	<cors />
	...
</http>

如果你有多个 CorsConfigurationSource Bean，Spring Security 不会自动为你配置 CORS 支持，这是因为它无法决定使用哪一个。如果你想为每个 SecurityFilterChain 指定不同的 CorsConfigurationSource，你可以直接将其传递给 .cors() DSL。

Java
Kotlin

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {

	@Bean
	@Order(0)
	public SecurityFilterChain apiFilterChain(HttpSecurity http) throws Exception {
		http
			.securityMatcher("/api/**")
			.cors((cors) -> cors
				.configurationSource(apiConfigurationSource())
			)
			...
		return http.build();
	}

	@Bean
	@Order(1)
	public SecurityFilterChain myOtherFilterChain(HttpSecurity http) throws Exception {
		http
			.cors((cors) -> cors
				.configurationSource(myWebsiteConfigurationSource())
			)
			...
		return http.build();
	}

	CorsConfigurationSource apiConfigurationSource() {
		CorsConfiguration configuration = new CorsConfiguration();
		configuration.setAllowedOrigins(Arrays.asList("https://api.example.com"));
		configuration.setAllowedMethods(Arrays.asList("GET","POST"));
		UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
		source.registerCorsConfiguration("/**", configuration);
		return source;
	}

	CorsConfigurationSource myWebsiteConfigurationSource() {
		CorsConfiguration configuration = new CorsConfiguration();
		configuration.setAllowedOrigins(Arrays.asList("https://example.com"));
		configuration.setAllowedMethods(Arrays.asList("GET","POST"));
		UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
		source.registerCorsConfiguration("/**", configuration);
		return source;
	}

}

@Bean
fun corsConfigurationSource(): CorsConfigurationSource {
    val configuration = CorsConfiguration()
    configuration.allowedOrigins = listOf("https://example.com")
    configuration.allowedMethods = listOf("GET", "POST")
    val source = UrlBasedCorsConfigurationSource()
    source.registerCorsConfiguration("/**", configuration)
    return source
}