Spring security oauth2的认证流程是什么

@Override
	public void configure(HttpSecurity http) throws Exception {

		AuthenticationManager oauthAuthenticationManager = oauthAuthenticationManager(http);
		resourcesServerFilter = new OAuth3AuthenticationProcessingFilter();
		resourcesServerFilter.setAuthenticationEntryPoint(authenticationEntryPoint);
		resourcesServerFilter.setAuthenticationManager(oauthAuthenticationManager);
		if (eventPublisher != null) {
			resourcesServerFilter.setAuthenticationEventPublisher(eventPublisher);
		}
		if (tokenExtractor != null) {
		 //添加token的额外解析方法 默认调用BearerTokenExtractor
			resourcesServerFilter.setTokenExtractor(tokenExtractor);
		}
		if (authenticationDetailsSource != null) {
			resourcesServerFilter.setAuthenticationDetailsSource(authenticationDetailsSource);
		}
		resourcesServerFilter = postProcess(resourcesServerFilter);
		resourcesServerFilter.setStateless(stateless);

		// @formatter:off
		http
			.authorizeRequests().expressionHandler(expressionHandler)
		.and()
			.addFilterBefore(resourcesServerFilter, AbstractPreAuthenticatedProcessingFilter.class)
			.exceptionHandling()
				.accessDeniedHandler(accessDeniedHandler)
				.authenticationEntryPoint(authenticationEntryPoint);
		// @formatter:on
	}

public class OAuth3AuthenticationProcessingFilter implements Filter, InitializingBean {
...
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException,
			ServletException {

		final boolean debug = logger.isDebugEnabled();
		final HttpServletRequest request = (HttpServletRequest) req;
		final HttpServletResponse response = (HttpServletResponse) res;

		try {
//调用TokenExtractor从httpRequest解析出对应的token值，将其转化为Authentication对象。
			Authentication authentication = tokenExtractor.extract(request);
			
			if (authentication == null) {
				if (stateless && isAuthenticated()) {
					if (debug) {
						logger.debug("Clearing security context.");
					}
					SecurityContextHolder.clearContext();
				}
				if (debug) {
					logger.debug("No token in request, will continue chain.");
				}
			}
			else {
				request.setAttribute(OAuth3AuthenticationDetails.ACCESS_TOKEN_VALUE, authentication.getPrincipal());
				if (authentication instanceof AbstractAuthenticationToken) {
					AbstractAuthenticationToken needsDetails = (AbstractAuthenticationToken) authentication;
					needsDetails.setDetails(authenticationDetailsSource.buildDetails(request));
				}
//2调用的Authenticationd对象，调用authenticationManager.authenticate的方法
来判断用户是否登陆成功
				Authentication authResult = authenticationManager.authenticate(authentication);

				if (debug) {
					logger.debug("Authentication success: " + authResult);
				}

				eventPublisher.publishAuthenticationSuccess(authResult);
				SecurityContextHolder.getContext().setAuthentication(authResult);

			}
		}
		catch (OAuth3Exception failed) {
			SecurityContextHolder.clearContext();

			if (debug) {
				logger.debug("Authentication request failed: " + failed);
			}
			eventPublisher.publishAuthenticationFailure(new BadCredentialsException(failed.getMessage(), failed),
					new PreAuthenticatedAuthenticationToken("access-token", "N/A"));

			authenticationEntryPoint.commence(request, response,
					new InsufficientAuthenticationException(failed.getMessage(), failed));

			return;
		}

		chain.doFilter(request, response);
	}
}
....
}

--ResourceServerSecurityConfigurer.java
private AuthenticationManager oauthAuthenticationManager(HttpSecurity http) {
		OAuth3AuthenticationManager oauthAuthenticationManager = new OAuth3AuthenticationManager();
		if (authenticationManager != null) {
			if (authenticationManager instanceof OAuth3AuthenticationManager) {
				oauthAuthenticationManager = (OAuth3AuthenticationManager) authenticationManager;
			}
			else {
				return authenticationManager;
			}
		}
		oauthAuthenticationManager.setResourceId(resourceId);
//配置tokenService解析方式		oauthAuthenticationManager.setTokenServices(resourceTokenServices(http));
		oauthAuthenticationManager.setClientDetailsService(clientDetails());
		return oauthAuthenticationManager;
	}

private ResourceServerTokenServices resourceTokenServices(HttpSecurity http) {
		tokenServices(http);
		return this.resourceTokenServices;
	}

	private ResourceServerTokenServices tokenServices(HttpSecurity http) {
		if (resourceTokenServices != null) {
			return resourceTokenServices;
		}
		DefaultTokenServices tokenServices = new DefaultTokenServices();
		//指定token的解析方式
		tokenServices.setTokenStore(tokenStore());
		tokenServices.setSupportRefreshToken(true);
		tokenServices.setClientDetailsService(clientDetails());
		this.resourceTokenServices = tokenServices;
		return tokenServices;
	}

--OAuth3AuthenticationManager认证管理
	public Authentication authenticate(Authentication authentication) throws AuthenticationException {

		if (authentication == null) {
			throw new InvalidTokenException("Invalid token (token not found)");
		}
		String token = (String) authentication.getPrincipal();
//从指定的实现的tokenStore中获取对应的值
		OAuth3Authentication auth = tokenServices.loadAuthentication(token);
		if (auth == null) {
			throw new InvalidTokenException("Invalid token: " + token);
		}

		Collection<String> resourceIds = auth.getOAuth3Request().getResourceIds();
		if (resourceId != null && resourceIds != null && !resourceIds.isEmpty() && !resourceIds.contains(resourceId)) {
			throw new OAuth3AccessDeniedException("Invalid token does not contain resource id (" + resourceId + ")");
		}

		checkClientDetails(auth);

		if (authentication.getDetails() instanceof OAuth3AuthenticationDetails) {
			OAuth3AuthenticationDetails details = (OAuth3AuthenticationDetails) authentication.getDetails();
			// Guard against a cached copy of the same details
			if (!details.equals(auth.getDetails())) {
				// Preserve the authentication details from the one loaded by token services
				details.setDecodedDetails(auth.getDetails());
			}
		}
		auth.setDetails(authentication.getDetails());
		auth.setAuthenticated(true);
		return auth;

	}