我正在通过在 GitHub 上分解这三个相互关联的应用程序来研究 Spring OAuth ,同时还仔细研究了此链接上的 Spring OAuth 2 开发人员指南。 开发人员指南说/oauth/error
需要自定义端点,但是应该使用哪些特定代码来成功覆盖/oauth/error
?
第一次尝试:
我第一次尝试进行覆盖是抛出错误,您可以在调试日志中看到,我已通过此链接将其上传到文件共享站点。
我首先尝试让 Spring 提供的代码元素在示例应用程序中工作。
authserver
首先,我在上面的示例应用程序链接中为应用程序添加了一个新的控制器类,并添加了一些来自 Spring 的示例代码WhiteLabelErrorEndpoint.java
,您可以在此链接中阅读。我的尝试如下:
package demo;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.security.oauth2.common.exceptions.OAuth2Exception;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.util.HtmlUtils;
@Controller
public class CustomViewsController {
private static final String ERROR = "<html><body><h1>OAuth Error</h1><p>${errorSummary}</p></body></html>";
@RequestMapping("/oauth/error")
public ModelAndView handleError(HttpServletRequest request) {
Map<String, Object> model = new HashMap<String, Object>();
Object error = request.getAttribute("error");
// The error summary may contain malicious user input,
// it needs to be escaped to prevent XSS
String errorSummary;
if (error instanceof OAuth2Exception) {
OAuth2Exception oauthError = (OAuth2Exception) error;
errorSummary = HtmlUtils.htmlEscape(oauthError.getSummary());
}
else {
errorSummary = "Unknown error";
}
model.put("errorSummary", errorSummary);
return new ModelAndView(new SpelView(ERROR), model);
}
}
我通过复制此链接中的代码SpelView.java
添加了上面链接使用的以下字符串处理程序类:
package demo;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.context.expression.MapAccessor;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.security.oauth2.common.util.RandomValueStringGenerator;
import org.springframework.util.PropertyPlaceholderHelper;
import org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
/**
* Simple String template renderer.
*
*/
class SpelView implements View {
private final String template;
private final String prefix;
private final SpelExpressionParser parser = new SpelExpressionParser();
private final StandardEvaluationContext context = new StandardEvaluationContext();
private PlaceholderResolver resolver;
public SpelView(String template) {
this.template = template;
this.prefix = new RandomValueStringGenerator().generate() + "{";
this.context.addPropertyAccessor(new MapAccessor());
this.resolver = new PlaceholderResolver() {
public String resolvePlaceholder(String name) {
Expression expression = parser.parseExpression(name);
Object value = expression.getValue(context);
return value == null ? null : value.toString();
}
};
}
public String getContentType() {
return "text/html";
}
public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response)
throws Exception {
Map<String, Object> map = new HashMap<String, Object>(model);
String path = ServletUriComponentsBuilder.fromContextPath(request).build()
.getPath();
map.put("path", (Object) path==null ? "" : path);
context.setRootObject(map);
String maskedTemplate = template.replace("${", prefix);
PropertyPlaceholderHelper helper = new PropertyPlaceholderHelper(prefix, "}");
String result = helper.replacePlaceholders(maskedTemplate, resolver);
result = result.replace(prefix, "${");
response.setContentType(getContentType());
response.getWriter().append(result);
}
}