英文:
How to create interceptor for transforming http headers to custom dto?
问题
在我的一个应用程序中，有许多具有相同一组标头的端点：
@RequestHeader("foo") String foo,@RequestHeader("bar") String bar,@RequestHeader("baz") String baz,
并且在每个控制器方法中，我根据这些标头创建自己的自定义 DTO：
MyDto myDto = new MyDto(foo, bar, baz);
为了避免重复，并且不必在每个方法中添加/删除一个标头 50 次，我希望有一个类似拦截器的类，它将获取 HttpHeaders 并将其转换为 MyDto，然后我希望能够在控制器方法中替换所有请求标头，只需简单地在幕后创建 MyDto myDto。
我尝试找到解决方案，但没有找到任何内容。
实际：
@PostMapping("/myEndpoint")public MyResponse myEndpoint(@RequestHeader("foo") String foo,@RequestHeader("bar") String bar,@RequestHeader("baz") String baz,@RequestBody MyRequest myRequest) {MyDto myDto = new MyDto(foo, bar, baz);myService.doSomething(myDto);...}
期望：
@PostMapping("/myEndpoint")public MyResponse myEndpoint(MyDto myDto,@RequestBody MyRequest myRequest) {myService.doSomething(myDto);...}
我还为此编写了一个方法：
public MyDto transform(HttpHeaders httpHeaders) {String foo = getHeader(httpHeaders, "foo");String bar = getHeader(httpHeaders, "bar");String baz = getHeader(httpHeaders, "baz");return new MyDto(foo, bar, baz);}private String getHeader(HttpHeaders httpHeaders,String key) {return Optional.ofNullable(httpHeaders.get(key)).map(Collection::stream).orElseGet(Stream::empty).findFirst().orElse(null);}
但我不知道何时可以调用它，以便在每个请求上运行它。
英文:
In one of my app I have many endpoints with the same set of headers:
@RequestHeader("foo") String foo,@RequestHeader("bar") String bar,@RequestHeader("baz") String baz,
and in each controller method I am creating my custom dto based on those headers:
MyDto myDto = new MyDto(foo, bar, baz);
To avoid duplicates and adding/removing one header 50 times to each method, I want to have something like interceptor class that will take HttpHeaders and will transform it MyDto only once, so then I want to be able to replace all request headers in controller methods by simply MyDto myDto created behind the scenes.
I tried to find solution, but didn't found anything.
Actual:
@PostMapping("/myEndpoint")public MyResponse myEndpoint(@RequestHeader("foo") String foo,@RequestHeader("bar") String bar,@RequestHeader("baz") String baz,@RequestBody MyRequest myRequest) {MyDto myDto = new MyDto(foo, bar, baz);myService.doSomething(myDto);...}
Expected:
@PostMapping("/myEndpoint")public MyResponse myEndpoint(MyDto myDto,@RequestBody MyRequest myRequest) {myService.doSomething(myDto);...}
I also have a method for it:
public MyDto transform(HttpHeaders httpHeaders) {String foo = getHeader(httpHeaders, "foo");String bar = getHeader(httpHeaders, "bar");String baz = getHeader(httpHeaders, "baz");return new MyDto(foo, bar, baz);}private String getHeader(HttpHeaders httpHeaders,String key) {return Optional.ofNullable(httpHeaders.get(key)).map(Collection::stream).orElseGet(Stream::empty).findFirst().orElse(null);}
But I don't know when I can call it to make it runnable on each request.
答案1
得分: 1
我正要说，编写并注册一个“custom HandlerInterceptor”。它将允许您访问头信息，但问题是您将无法访问转换后的@RequestBody对象——至少就我所知。我认为这不容易实现。
英文:
I was about to say , write and register a custom HandlerInterceptor. It would allow you to access the headers, but the problem is you won't get access to the converted @RequestBody object - at least, as far as I know. I don't think this can easily be done.
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