我想实现自定义 Content-Type 验证过滤器,以便可以提供 415 Unsupported Media Type 上的自定义错误模型。
像这样的东西:
public class ValidateContentTypeFilterAttribute : ActionFilterAttribute
{
private const string JsonMimeType = "application/json";
public override void OnActionExecuting(ActionExecutingContext context)
{
string requestMethod = context.HttpContext.Request.Method.ToUpper();
if (requestMethod == WebRequestMethods.Http.Post || requestMethod == WebRequestMethods.Http.Put)
{
if (request.ContentType != JsonMimeType)
{
// "Unsupported Media Type" HTTP result.
context.Result = new HttpUnsupportedMediaTypeResult();
return;
}
}
}
}
问题是 MVC 管道似乎在执行任何自定义过滤器之前“捕获”了不受支持或无效的 Content-Type 值。即使是“application/xml”内容类型也会被拒绝。
这将在哪里配置?
我的 MVC 配置仅包含以下内容:
public void ConfigureServices(IServiceCollection services)
{
services
.AddMvc()
.AddJsonOptions(options =>
{
options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
options.SerializerSettings.DefaultValueHandling = DefaultValueHandling.Include;
options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
options.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
options.SerializerSettings.Converters.Add(new SquidJsonConverter());
})
.AddMvcOptions(options =>
{
options.Filters.Add(typeof(ValidateAntiForgeryTokenAttribute));
options.Filters.Add(typeof(ValidateContentTypeFilterAttribute));
options.Filters.Add(typeof(ValidateAcceptFilterAttribute));
options.Filters.Add(typeof(ValidateModelFilterAttribute));
});
...
}