结合使用Fog和Ruby生成预签名URL，以在Amazon S3中放置文件 [英] Use Fog with Ruby to generate a Pre-signed URL to PUT a file in Amazon S3

问题描述

我正在使用Fog gem生成预签名的URL.我可以成功完成此操作以获得对该文件的读取访问权限.这是我的工作:

I am using the Fog gem to generate presigned urls. I can do this successfully to get read access to the file. Here's what I do:

    fog_s3 = Fog::Storage.new({
          :provider                 => 'AWS',
          :aws_access_key_id        => key,
          :aws_secret_access_key    => secret
    })
    object_path = 'foo.wav' 
    expiry = Date.new(2014,2,1).to_time.to_i
    url = fog_s3.directories.new(:key => bucket).files.new(:key => object_path).url(expiry,path_style: true)

但是当我尝试上传文件时，这不起作用.有没有一种方法可以指定http动词，使其成为PUT而不是GET?

But this doesn't work when I try to upload the file. Is there a way to specify the http verb so it would be a PUT and not a GET?

编辑，我看到了一种方法:put_object_url，可能会有所帮助.我不知道如何访问.

EDIT I see a method: put_object_url which might help. I don't know how access it.

谢谢

编辑:

它有帮助-它给了我一个PUT-而不是GET.但是，我仍然有问题.我添加了内容类型:

It helped - it got me a PUT - not GET. However, I'm still having issues. I added content type:

    headers = { "Content-Type" => "audio/wav" }
    options = { path_style: true }
    object_path = 'foo.wav' 
    expiry = Date.new(2014,2,1).to_time.to_i  
    url = fog_s3.put_object_url(bucket,object_path, expiry, headers, options)

，但该URL中不包含Content-Type.从HTML中的Javascript完成后，我在URL中得到了Content-Type，这似乎可行.这是雾的问题吗?还是我的标题不正确?

but the url does not contain Content-Type in it. When done from Javascript in HTML I get the Content-Type in the url and that seems to work. Is this an issue with Fog? or is my header incorrect?

推荐答案

我认为put_object_url确实是您想要的.如果您按照url方法返回定义的位置，则可以在此处看到它使用的一种称为get_object_url的相似方法(

I think put_object_url is indeed what you want. If you follow the url method back to where it is defined, you can see it uses a similar method underlying it called get_object_url here (https://github.com/fog/fog/blob/dc7c5e285a1a252031d3d1570cbf2289f7137ed0/lib/fog/aws/models/storage/files.rb#L83). You should be able to do something similar and can do so by calling this method from the fog_s3 object you already created above. It should end up just looking like this:

headers = {}
options = { path_style: true }
url = fog_s3.put_object_url(bucket, object_path, expires, headers, options)

请注意，与get_object_url不同，那里有一个额外的标头选项(您可以用来做诸如设置Content-Type之类的事情).

Note that unlike get_object_url there is an extra headers option snuck in there (which you can use to do stuff like set Content-Type I believe).

希望能为您排序，但是如果您还有其他问题，请告诉我.谢谢！

Hope that sorts it for you, but just let me know if you have further questions. Thanks!

附录

嗯，似乎毕竟可能存在一个与此相关的错误(我想知道现在这部分代码已被执行了多少).我认为您应该可以解决此问题(但我不确定).我怀疑您也可以将选项中的值复制为查询参数.你可以尝试这样的事情吗?

Hmm, seems there may be a bug related to this after all (I'm wondering now how much this portion of the code has been exercised). I think you should be able to work around it though (but I'm not certain). I suspect you can just duplicate the value in the options as a query param also. Could you try something like this?

headers = query = { 'Content-Type' => 'audio/wav' }
options = { path_style: true, query: query }
url = fog_s3.put_object_url(bucket, object_path, expires, headers, options)

希望这可以为您填补空白(如果可以的话，如果可以的话，我们可以考虑在雾中修复此行为更多).谢谢！

Hopefully that fills in the blanks for you (and if so we can think some more about fixing that behavior within fog if it makes sense to do so). Thanks!

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