Portfolio

🧑🏻‍💻 강의내용

WebSecurity 클래스는 필터 체인 관련 전역 설정을 처리할 수 있는 API 제공

ignoring()

Spring Security 필터 체인을 적용하고 싶지 않은 리소스에 대해 설정
일반적으로 정적 리소스(*.html, *.css, *.js 등)을 예외 대상으로 설정함
불필요한 서버 자원 낭비를 방지함

🚀 WebSecurity - 필터 체인 등록

여기서 필터체인이 만들어져서 등록됩니다.


public final class WebSecurity extends AbstractConfiguredSecurityBuilder<Filter, WebSecurity>
		implements SecurityBuilder<Filter>, ApplicationContextAware, ServletContextAware {

	...

	@Override
	protected Filter performBuild() throws Exception {
		Assert.state(!this.securityFilterChainBuilders.isEmpty(),
				() -> "At least one SecurityBuilder<? extends SecurityFilterChain> needs to be specified. "
						+ "Typically this is done by exposing a SecurityFilterChain bean "
						+ "or by adding a @Configuration that extends WebSecurityConfigurerAdapter. "
						+ "More advanced users can invoke " + WebSecurity.class.getSimpleName()
						+ ".addSecurityFilterChainBuilder directly");
		int chainSize = this.ignoredRequests.size() + this.securityFilterChainBuilders.size();
		List<SecurityFilterChain> securityFilterChains = new ArrayList<>(chainSize);
		List<RequestMatcherEntry<List<WebInvocationPrivilegeEvaluator>>> requestMatcherPrivilegeEvaluatorsEntries = new ArrayList<>();

		// ✨ 1-1. 여기서 WebSecurity - ignoring이 등록된 것이 Start!
		for (RequestMatcher ignoredRequest : this.ignoredRequests) {
			WebSecurity.this.logger.warn("You are asking Spring Security to ignore " + ignoredRequest
					+ ". This is not recommended -- please use permitAll via HttpSecurity#authorizeHttpRequests instead.");
	
			/** ✨ 1-2. DefaultSecurityFilterChain 등록하는데...?
			생성자에서 2번째 인자값으로 필터를 넘겨주질 않으니 필터 없이 등록이 된다.
			public DefaultSecurityFilterChain(RequestMatcher requestMatcher, Filter... filters) {...}			
			*/
			SecurityFilterChain securityFilterChain = new DefaultSecurityFilterChain(ignoredRequest);
			securityFilterChains.add(securityFilterChain);
			requestMatcherPrivilegeEvaluatorsEntries
					.add(getRequestMatcherPrivilegeEvaluatorsEntry(securityFilterChain));
		}
		
		// ✨ 그 외의 경우에는 여기서 필터 체인을 만들어서 등록
		for (SecurityBuilder<? extends SecurityFilterChain> securityFilterChainBuilder : this.securityFilterChainBuilders) {
			SecurityFilterChain securityFilterChain = securityFilterChainBuilder.build();
			securityFilterChains.add(securityFilterChain);
			requestMatcherPrivilegeEvaluatorsEntries
					.add(getRequestMatcherPrivilegeEvaluatorsEntry(securityFilterChain));
		}
		if (this.privilegeEvaluator == null) {
			this.privilegeEvaluator = new RequestMatcherDelegatingWebInvocationPrivilegeEvaluator(
					requestMatcherPrivilegeEvaluatorsEntries);
		}
		FilterChainProxy filterChainProxy = new FilterChainProxy(securityFilterChains);
		if (this.httpFirewall != null) {
			filterChainProxy.setFirewall(this.httpFirewall);
		}
		if (this.requestRejectedHandler != null) {
			filterChainProxy.setRequestRejectedHandler(this.requestRejectedHandler);
		}
		filterChainProxy.afterPropertiesSet();

		Filter result = filterChainProxy;
		if (this.debugEnabled) {
			this.logger.warn("\n\n" + "********************************************************************\n"
					+ "**********        Security debugging is enabled.       *************\n"
					+ "**********    This may include sensitive information.  *************\n"
					+ "**********      Do not use in a production system!     *************\n"
					+ "********************************************************************\n\n");
			result = new DebugFilter(filterChainProxy);
		}
		this.postBuildAction.run();
		return result;
	}
}

📌 디버깅을 해보면 결과적으로 ignoring 용 NoFilter Chain과 나머지 가 생성되는걸 볼수 있습니다.