Google App Engine getImageServingUrl，下载文件名 [英] Google App Engine getImageServingUrl with download file name

问题描述

我使用 getImageServingUrl 方法来生成图像的URL，它与以下列出的选项一起工作良好：

I'm using getImageServingUrl method to generate URL to an image and it works nicely along with options listed at List of all the App Engine images service get_serving_url() URI options

我可以添加d选项来强制文件下载，而不是仅仅在浏览器中显示它。问题是文件名默认为unnamed。[ext]（其中[ext]是源文件的扩展名）。有没有一种方法可以将原始文件名传递到请求的某处？

I can add "d" option to force file download instead of just presenting it in the browser. The thing is that file name defaults to "unnamed.[ext]" (where [ext] is source file extension). Is there a way I can pass the original filename somewhere to the request?

我可以使用CloudStorageTools :: serve以指定名称保存文件，但例如我无法然后使用图像大小调整功能。

I can use CloudStorageTools::serve to save file under given name but for example I can't use the image resizing features then.

推荐答案

我不知道任何允许这样做的选项。
但是我有另一种方式的概念，这有点复杂，但对您来说可能是一个不错的选择。
您可以使用nginx构建一个反向代理，它将通过您自己的域为您提供Google图片。然后，您可以将原始请求中的文件名作为参数发送。在nginx中，您可以在代理请求之前从请求中删除文件名参数，并将其添加为标题以在响应中定义文件名。
作为nginx配置中的一个进程，这非常直接：

I am not aware of any option that would allow this. But I have a concept for another way, that is a bit complicated, but might be a good option for you. You can use nginx to build a reverse proxy, that will serve the google images for you through your own domain. Then you could send the filename in your original request as a parameter. In nginx you can get rid of the filename parameter from the request before proxying the request and add it as a header to define the filename in the response. This is pretty straighforward as a process in your nginx config:

location /image-storage/ {
    expires 30d;

    #Get rid of headers to be overwritten
    proxy_hide_header Pragma;
    proxy_hide_header Cache-Control;
    proxy_hide_header Content-Disposition;

    #Add caching headers
    add_header Pragma public;
    add_header Cache-Control "public";
    #If the parameter "filename" is sent, use it as filename
    if ($arg_filename) {
        add_header Content-Disposition 'inline; filename="$arg_filename"';
    }
    #If the parameter "dl_filename" is sent, use it as filename and init download (attachment)
    if ($arg_dl_filename) {
        add_header Content-Disposition 'attachment; filename="$arg_dl_filename"';
    }

    #Proxy the request to google
    proxy_pass       https://lh3.googleusercontent.com/;
    proxy_set_header Host lh3.googleusercontent.com;

    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    proxy_buffering off;
}

这样一个网址： https://yourdomain.com/image-storage/longgoogletokenhere?dl_filename=test.jpg 将代理到< a href =https://lh3.googleusercontent.com/longgoogletokenhere?dl_filename=test.jpg =nofollow noreferrer> https://lh3.googleusercontent.com/longgoogletokenhere?dl_filename=test.jpg 并且响应会为缓存和文件名获得新的标头。

This way a url like: https://yourdomain.com/image-storage/longgoogletokenhere?dl_filename=test.jpg would be proxied to https://lh3.googleusercontent.com/longgoogletokenhere?dl_filename=test.jpg and the response would get new headers for caching and filename.

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