SpringSecurity OAuth2之授权码获取流程分析

前言

本文主要从AuthorizationEndpoint的初始化和其authorize方法等方面进行授权码获取流程分析

一、AuthorizationEndpoint的初始化

AuthorizationEndpoint是授权码处理端点
AuthorizationEndpoint的初始化方式在注解@EnableAuthorizationServer引入的配置类AuthorizationServerEndpointsConfiguration中。

@Configuration
@Import(TokenKeyEndpointRegistrar.class)
public class AuthorizationServerEndpointsConfiguration {

	private AuthorizationServerEndpointsConfigurer endpoints = new AuthorizationServerEndpointsConfigurer();

	@Autowired
	private ClientDetailsService clientDetailsService;

	@Autowired
	private List<AuthorizationServerConfigurer> configurers = Collections.emptyList();

	//忽略代码.....

	@Bean
	public AuthorizationEndpoint authorizationEndpoint() throws Exception {
		AuthorizationEndpoint authorizationEndpoint = new AuthorizationEndpoint();
		FrameworkEndpointHandlerMapping mapping = getEndpointsConfigurer().getFrameworkEndpointHandlerMapping();
		authorizationEndpoint.setUserApprovalPage(extractPath(mapping, "/oauth/confirm_access"));
		authorizationEndpoint.setProviderExceptionHandler(exceptionTranslator());
		authorizationEndpoint.setErrorPage(extractPath(mapping, "/oauth/error"));
		authorizationEndpoint.setTokenGranter(tokenGranter());
		authorizationEndpoint.setClientDetailsService(clientDetailsService);
		authorizationEndpoint.setAuthorizationCodeServices(authorizationCodeServices());
		authorizationEndpoint.setOAuth2RequestFactory(oauth2RequestFactory());
		authorizationEndpoint.setOAuth2RequestValidator(oauth2RequestValidator());
		authorizationEndpoint.setUserApprovalHandler(userApprovalHandler());
		authorizationEndpoint.setRedirectResolver(redirectResolver());
		return authorizationEndpoint;
	}
   //忽略代码.....
}

二、开始获取授权码

在浏览器调用如下url
http://Localhost:8080/oauth/authorize?response_type=code&client_id=client&redirect_uri=http://www.baidu.com&scope=read

@FrameworkEndpoint
@SessionAttributes({AuthorizationEndpoint.AUTHORIZATION_REQUEST_ATTR_NAME, AuthorizationEndpoint.ORIGINAL_AUTHORIZATION_REQUEST_ATTR_NAME})
public class AuthorizationEndpoint extends AbstractEndpoint {

	@RequestMapping(value = "/oauth/authorize")
	public ModelAndView authorize(Map<String, Object> model, @RequestParam Map<String, String> parameters,
			SessionStatus sessionStatus, Principal principal) {

		//首先使用OAuth2RequestFactory拉出授权请求。所有进一步的逻辑都应该是正确的
		//查询授权请求，而不是返回参数映射。报告的内容
		//创建参数映射后，参数映射将存储在AuthorizationRequest对象中，而不进行更改。
		AuthorizationRequest authorizationRequest = getOAuth2RequestFactory().createAuthorizationRequest(parameters);
        //获取其response_type
		Set<String> responseTypes = authorizationRequest.getResponseTypes();
        //response_type值必须是token或者code
		if (!responseTypes.contains("token") && !responseTypes.contains("code")) {
			throw new UnsupportedResponseTypeException("Unsupported response types: " + responseTypes);
		}
        //客户端id不能为null
		if (authorizationRequest.getClientId() == null) {
			throw new InvalidClientException("A client id must be provided");
		}

		try {
            //用户第一次调这个principal肯定为null，所以他会调转到登陆页面
            //用户登陆后，在次进入这个接口，principal是有值的，principal是UsernamePasswordAuthenticationToken
			if (!(principal instanceof Authentication) || !((Authentication) principal).isAuthenticated()) {
				throw new InsufficientAuthenticationException(
						"User must be authenticated with Spring Security before authorization can be completed.");
			}

			ClientDetails client = getClientDetailsService().loadClientByClientId(authorizationRequest.getClientId());

			//解析的重定向URI是参数中的重定向URI或参数中的重定向URI
             //客户详细信息。无论哪种方式，我们都需要将其存储在AuthorizationRequest上。
			String redirectUriParameter = authorizationRequest.getRequestParameters().get(OAuth2Utils.REDIRECT_URI);
			String resolvedRedirect = redirectResolver.resolveRedirect(redirectUriParameter, client);
			if (!StringUtils.hasText(resolvedRedirect)) {
				throw new RedirectMismatchException("");
			}
			authorizationRequest.setRedirectUri(resolvedRedirect);

			//我们有意只验证客户机请求的参数（忽略可能存在的任何数据）
             //已由经理添加到请求中）。
			oauth2RequestValidator.validateScope(authorizationRequest, client);

			//某些系统可能允许记住或默认批准批准决定。查证
           //在这里输入这些逻辑，并相应地在授权请求上设置approved标志。
			authorizationRequest = userApprovalHandler.checkForPreApproval(authorizationRequest,(Authentication) principal);
			// TODO: is this call necessary?
			boolean approved = userApprovalHandler.isApproved(authorizationRequest, (Authentication) principal);
			authorizationRequest.setApproved(approved);

			//验证已经完成，所以我们可以检查自动批准。。。
			if (authorizationRequest.isApproved()) {
				if (responseTypes.contains("token")) {
					return getImplicitGrantResponse(authorizationRequest);
				}
				if (responseTypes.contains("code")) {
					return new ModelAndView(getAuthorizationCodeResponse(authorizationRequest,
							(Authentication) principal));
				}
			}

			//在会话中存储authorizationRequest和authorizationRequest的不可变映射
            //将用于根据approveOrDeny（）中的
			model.put(AUTHORIZATION_REQUEST_ATTR_NAME, authorizationRequest);
			model.put(ORIGINAL_AUTHORIZATION_REQUEST_ATTR_NAME, unmodifiableMap(authorizationRequest));
            //转发到页面/oauth/confirm_access
			return getUserApprovalPageResponse(model, authorizationRequest, (Authentication) principal);

		}
		catch (RuntimeException e) {
			sessionStatus.setComplete();
			throw e;
		}

	}
}

用户第一次调用，他会调转到登陆页面，在用户登陆后，在次进入这个接口，会转发到/oauth/confirm_access

@FrameworkEndpoint
@SessionAttributes("authorizationRequest")
public class WhitelabelApprovalEndpoint {

	@RequestMapping("/oauth/confirm_access")
	public ModelAndView getAccessConfirmation(Map<String, Object> model, HttpServletRequest request) throws Exception{
		final String approvalContent = createTemplate(model, request);
		if (request.getAttribute("_csrf") != null) {
			model.put("_csrf", request.getAttribute("_csrf"));
		}
		View approvalView = new View() {
			@Override
			public String getContentType() {
				return "text/html";
			}

			@Override
			public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response) throws Exception {
				response.setContentType(getContentType());
				response.getWriter().append(approvalContent);
			}
		};
		return new ModelAndView(approvalView, model);
	}

	protected String createTemplate(Map<String, Object> model, HttpServletRequest request) {
		AuthorizationRequest authorizationRequest = (AuthorizationRequest) model.get("authorizationRequest");
		String clientId = authorizationRequest.getClientId();

		StringBuilder builder = new StringBuilder();
		builder.append("
OAuth Approval
");
		builder.append("
Do you authorize \"").append(HtmlUtils.htmlEscape(clientId));
		builder.append("\" to access your protected resources?
");
		builder.append("
);

		String requestPath = ServletUriComponentsBuilder.fromContextPath(request).build().getPath();
		if (requestPath == null) {
			requestPath = "";
		}

		builder.append(requestPath).append("/oauth/authorize\" method=\"post\">");
		builder.append("");

		String csrfTemplate = null;
		CsrfToken csrfToken = (CsrfToken) (model.containsKey("_csrf") ? model.get("_csrf") : request.getAttribute("_csrf"));
		if (csrfToken != null) {
			csrfTemplate = " + HtmlUtils.htmlEscape(csrfToken.getParameterName()) +
					"\" value=\"" + HtmlUtils.htmlEscape(csrfToken.getToken()) + "\" />";
		}
		if (csrfTemplate != null) {
			builder.append(csrfTemplate);
		}

		String authorizeInputTemplate = "";

		if (model.containsKey("scopes") || request.getAttribute("scopes") != null) {
			builder.append(createScopes(model, request));
			builder.append(authorizeInputTemplate);
		} else {
			builder.append(authorizeInputTemplate);
			builder.append("
);
			builder.append(requestPath).append("/oauth/authorize\" method=\"post\">");
			builder.append("");
			if (csrfTemplate != null) {
				builder.append(csrfTemplate);
			}
			builder.append(""
);
		}

		builder.append("");

		return builder.toString();
	}

	private CharSequence createScopes(Map<String, Object> model, HttpServletRequest request) {
		StringBuilder builder = new StringBuilder("
");
		@SuppressWarnings("unchecked")
		Map<String, String> scopes = (Map<String, String>) (model.containsKey("scopes") ?
				model.get("scopes") : request.getAttribute("scopes"));
		for (String scope : scopes.keySet()) {
			String approved = "true".equals(scopes.get(scope)) ? " checked" : "";
			String denied = !"true".equals(scopes.get(scope)) ? " checked" : "";
			scope = HtmlUtils.htmlEscape(scope);

			builder.append("
");
			builder.append(scope).append(": );
			builder.append(scope).append("\" value=\"true\"").append(approved).append(">Approve ");
			builder.append(").append(scope).append("\" value=\"false\"");
			builder.append(denied).append(">Deny
");
		}
		builder.append("
");
		return builder.toString();
	}
}

点击Approve成功后调url：/oauth/authorize，他是一个post接口

@FrameworkEndpoint
@SessionAttributes({AuthorizationEndpoint.AUTHORIZATION_REQUEST_ATTR_NAME, AuthorizationEndpoint.ORIGINAL_AUTHORIZATION_REQUEST_ATTR_NAME})
public class AuthorizationEndpoint extends AbstractEndpoint {

	@RequestMapping(value = "/oauth/authorize", method = RequestMethod.POST, params = OAuth2Utils.USER_OAUTH_APPROVAL)
	public View approveOrDeny(@RequestParam Map<String, String> approvalParameters, Map<String, ?> model,
			SessionStatus sessionStatus, Principal principal) {

		if (!(principal instanceof Authentication)) {
			sessionStatus.setComplete();
			throw new InsufficientAuthenticationException("");
		}

		AuthorizationRequest authorizationRequest = (AuthorizationRequest) model.get(AUTHORIZATION_REQUEST_ATTR_NAME);

		if (authorizationRequest == null) {
			sessionStatus.setComplete();
			throw new InvalidRequestException("");
		}

		//检查以确保在用户批准步骤期间未修改授权请求
		@SuppressWarnings("unchecked")
		Map<String, Object> originalAuthorizationRequest = (Map<String, Object>) model.get(ORIGINAL_AUTHORIZATION_REQUEST_ATTR_NAME);
		if (isAuthorizationRequestModified(authorizationRequest, originalAuthorizationRequest)) {
			throw new InvalidRequestException(".");
		}

		try {
			Set<String> responseTypes = authorizationRequest.getResponseTypes();

			authorizationRequest.setApprovalParameters(approvalParameters);
			authorizationRequest = userApprovalHandler.updateAfterApproval(authorizationRequest,
					(Authentication) principal);
			boolean approved = userApprovalHandler.isApproved(authorizationRequest, (Authentication) principal);
			authorizationRequest.setApproved(approved);

			if (authorizationRequest.getRedirectUri() == null) {
				sessionStatus.setComplete();
				throw new InvalidRequestException("Cannot approve request when no redirect URI is provided.");
			}

			if (!authorizationRequest.isApproved()) {
				return new RedirectView(getUnsuccessfulRedirect(authorizationRequest,
						new UserDeniedAuthorizationException("User denied access"), responseTypes.contains("token")),
						false, true, false);
			}

			if (responseTypes.contains("token")) {
				return getImplicitGrantResponse(authorizationRequest).getView();
			}

			return getAuthorizationCodeResponse(authorizationRequest, (Authentication) principal);
		}
		finally {
			sessionStatus.setComplete();
		}

	}


    private View getAuthorizationCodeResponse(AuthorizationRequest authorizationRequest, Authentication authUser) {
		try {
			return new RedirectView(getSuccessfulRedirect(authorizationRequest,
					generateCode(authorizationRequest, authUser)), false, true, false);
		}
		catch (OAuth2Exception e) {
			return new RedirectView(getUnsuccessfulRedirect(authorizationRequest, e, false), false, true, false);
		}
	}
}