Apereo CAS是一个开源的企业级单点登录系统，提供了OAuth2认证和授权的功能。/callbackAuthorize端点的目的是用于处理OAuth2授权码模式的回调请求。

当用户在客户端应用程序中进行OAuth2认证时，客户端应用程序会将用户重定向到Apereo CAS服务器的/callbackAuthorize端点，并传递授权码（code）作为查询参数。Apereo CAS服务器会验证授权码的有效性，并向客户端应用程序返回访问令牌（access token）和刷新令牌（refresh token）。

以下是一个示例的代码解决方法，用于处理/callbackAuthorize端点的请求：

import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.provider.ClientDetailsService;
import org.springframework.security.oauth2.provider.TokenRequest;
import org.springframework.security.oauth2.provider.endpoint.AuthorizationEndpoint;
import org.springframework.security.oauth2.provider.endpoint.RedirectResolver;
import org.springframework.security.oauth2.provider.endpoint.RedirectResolverRedirect;
import org.springframework.security.oauth2.provider.endpoint.RedirectResolverRegistry;
import org.springframework.security.oauth2.provider.endpoint.TokenEndpoint;
import org.springframework.security.oauth2.provider.endpoint.TokenGranter;
import org.springframework.security.oauth2.provider.token.AuthorizationServerTokenServices;
import org.springframework.security.oauth2.provider.token.TokenStore;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@RestController
public class OAuth2CallbackAuthorizeController {

    private AuthorizationEndpoint authorizationEndpoint;
    private TokenEndpoint tokenEndpoint;
    private RedirectResolverRegistry redirectResolverRegistry;
    private ClientDetailsService clientDetailsService;
    private TokenGranter tokenGranter;
    private AuthorizationServerTokenServices tokenServices;
    private TokenStore tokenStore;

    public OAuth2CallbackAuthorizeController(AuthorizationEndpoint authorizationEndpoint,
                                             TokenEndpoint tokenEndpoint,
                                             RedirectResolverRegistry redirectResolverRegistry,
                                             ClientDetailsService clientDetailsService,
                                             TokenGranter tokenGranter,
                                             AuthorizationServerTokenServices tokenServices,
                                             TokenStore tokenStore) {
        this.authorizationEndpoint = authorizationEndpoint;
        this.tokenEndpoint = tokenEndpoint;
        this.redirectResolverRegistry = redirectResolverRegistry;
        this.clientDetailsService = clientDetailsService;
        this.tokenGranter = tokenGranter;
        this.tokenServices = tokenServices;
        this.tokenStore = tokenStore;
    }

    @RequestMapping("/callbackAuthorize")
    public ModelAndView authorizeCallback(HttpServletRequest request) throws Exception {
        // 处理授权码模式的回调请求
        RedirectResolver redirectResolver = redirectResolverRegistry.getRedirectResolver(request);
        RedirectResolverRedirect redirect = redirectResolver.resolveRedirect(request, null);
        TokenRequest tokenRequest = this.authorizationEndpoint.getOAuth2RequestFactory().createTokenRequest(redirect.getRequestParameters(), clientDetailsService.loadClientByClientId(redirect.getResolvedRedirect()), redirect.getResolvedRedirect());
        OAuth2AccessToken accessToken = tokenEndpoint.postAccessToken(tokenRequest, null).getBody();

        // 返回访问令牌和刷新令牌等信息给客户端应用程序
        ModelAndView modelAndView = new ModelAndView("callbackAuthorizeSuccess");
        modelAndView.addObject("access_token", accessToken.getValue());
        modelAndView.addObject("refresh_token", accessToken.getRefreshToken().getValue());
        modelAndView.addObject("expires_in", accessToken.getExpiresIn());
        return modelAndView;
    }
}

在上述代码示例中，我们通过注入Apereo CAS的AuthorizationEndpoint、TokenEndpoint、RedirectResolverRegistry、ClientDetailsService、TokenGranter、AuthorizationServerTokenServices和TokenStore等对象，来处理/callbackAuthorize端点的请求。在authorizeCallback方法中，我们首先通过RedirectResolver解析重定向URL，并创建TokenRequest对象。然后，我们调用TokenEndpoint的postAccessToken方法来获取访问令牌。最后，我们将访问令牌和刷新令牌等信息返回给客户端应用程序。

请注意，上述代码示例仅提供了一个简单的示例，实际实现中可能需要根据具体的需求进行适当的修改和调整。