ASP.NET Core:是否可以使用HttpClient来获取文件并直接返回? [英] ASP.NET Core: Is it possible to use HttpClient to fetch a file and return directly?

问题描述

我有一个内部API，可以获取并返回文件结果.但是，此API没有任何身份验证/角色/权限检查的概念，因此无法进行修改.

I have an internal API that would fetch and return a fileresult. However, this API does not have any concept of authentication/role/permission checks and cannot be modified to do so.

我想在现有的ASP.NET Core 2 Web API上创建一个Web API终结点，以进行权限检查，对该内部API进行调用并将文件结果返回给Web客户端.

I would like to create an web API endpoint on an existing ASP.NET Core 2 Web API to do permission check, make a call to this internal API and return the fileresult back to a web client.

是否有可能使包装器API端点仅传递它获取的任何内容作为文件结果，而不必重建响应(例如，指定文件名，内容类型等)?文件可以是图像，pdf，文档.我希望此包装器API仅执行权限检查并使用某种fileId调用内部API端点，而无需了解内容的长度或类型.

Would it be possible to get the wrapper API endpoint to just pass whatever it fetches as a file result without having to reconstruct the response (e.g., specify file name, content type, etc)? The files could be images, pdfs, document. I would prefer that this wrapper API only do permission check and make a call to the internal API endpoint using some sort of fileId and not need to know about the content length or type.

推荐答案

按照@ chris-pratt的建议，事实并非如我最初预期的那样复杂地重建了结果.我最终以这种方式实施，以防有人需要在这里做类似的事情.

Per @chris-pratt's recommendation, turned out it wasn't that complicate to reconstruct the result as I originally anticipated. I ended up implementing this way in case someone needs to do something similar here.

... some validation logic outside the scope of the question...
using (HttpClient client = new HttpClient())
                {
                    var file = await client.GetAsync($"{someURL}/{id}");
                    return new FileContentResult(await file.Content.ReadAsByteArrayAsync(), file.Content.Headers.ContentType.MediaType);
                }

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