骆驼作为 REST 服务的 HTTP 代理 - 如何路由路径和参数？

Question

我正在尝试使用 Apache Camel 作为 REST 服务的 HTTP 代理，在中间执行一些身份验证，并且有一个看起来像这样的路由（为了测试目的删除了身份验证）：

from("servlet:apiwrapper?matchOnUriPrefix=true")
.to("http://HOST/BASEPATH?bridgeEndpoint=true&amp;throwExceptionOnFailure=false");

像这样访问 Camel Servlet 路径时：

http://CAMELHOST/apiwrapper/node
http://CAMELHOST/apiwrapper/node/stuff/blah?etc=t

等等...我想将这些路由到：

http://HOST/BASEPATH/node
http://HOST/BASEPATH/node/stuff/blah?etc=t

但我当前的路由配置只是将请求发送到

http://HOST/BASEPATH

无需附加任何我需要附加的 path/url 参数。如果我关闭 bridgeEndpoint，那么我只会在路由到达 .to(HTTP) 部分时抛出错误。

如何配置这条路线以映射那些通过的路线？

Answer 1

最后我想不出一个简单的方法来在配置中做到这一点，所以我在 http 端点的输入和路由末尾之间添加了一个 bean，它做了一些转换并添加了基本身份验证，看起来像这样：

  // Get all of the request path, including url params, after the context path of this camel app
  HttpServletRequest request = exchange.getIn().getHeader(Exchange.HTTP_SERVLET_REQUEST, HttpServletRequest.class);
  // Use the code below to get the request path instead of .getPathInfo(), as getPathInfo ignores url params
  String path = request.getRequestURI().substring(request.getContextPath().length());

  // Override the dummy host with the wrapped host
  exchange.getIn().setHeader(Exchange.HTTP_URI, "http://baseurl");
  // Override the path that was in the exchange before
  exchange.getIn().setHeader(Exchange.HTTP_PATH, path);
  // Finally override the request params
  exchange.getIn().setHeader(Exchange.HTTP_QUERY, request.getQueryString());

  // Set basic auth headers
  String basicAuth = String.format("%s:%s", "USERNAME", "PASSWORD");
  StringBuilder authHeader = new StringBuilder("Basic ");
  authHeader.append(Base64.encodeBase64String(basicAuth.getBytes(Charsets.UTF_8)));
  exchange.getIn().setHeader("Authorization", authHeader.toString());

我的路线看起来像这样，带有虚拟主机和参数：

from("servlet:apiwrapper?matchOnUriPrefix=true")
.to("bean:httpHeaderSetter?method=setHttpHeaders")
.to("http://HOST/BASEPATH?throwExceptionOnFailure=false&amp;httpClient.authenticationPreemptive=true");

骆驼作为 REST 服务的 HTTP 代理 - 如何路由路径和参数？

Camel as an HTTP Proxy to a REST service - How to route paths and parameters?

rest

proxy

servlets

apache-camel