AWS :: S3 :: S3Object.url_for - 如何使用新的AWS SDK Gem進行此操作？

Question

我一直在使用這種永遠和回形針和AWS-S3：

def authenticated_url(style = nil, expires_in = 90.minutes) 
     AWS::S3::S3Object.url_for(attachment.path(style || attachment.default_style), attachment.bucket_name, :expires_in => expires_in, :use_ssl => true) 
    end 

新回形針使用AWS-SDK的寶石，它打破這個給錯誤：

undefined method `url_for' for AWS::S3:Class 

有誰知道如何使這種方法適用於新的AWS-SDK gem？

Answer 1

要使用aws-sdk gem生成url，您應該使用AWS::S3Object#url_for方法。
您可以使用＃s3_object從回形針附件訪問S3Object實例。下面的代碼段可以解決你的問題。

def authenticated_url(style = nil, expires_in = 90.minutes) 
    attachment.s3_object(style).url_for(:read, :secure => true, :expires => expires_in).to_s 
end 

Answer 2

查看documentation後，url_for是一個實例方法，而不是一個類方法。

要生成AWS-SDK一個URL，你需要做到以下幾點：

bucket = AWS::S3::Bucket.new(attachment.bucket_name) 
s3object = AWS::S3::S3Object.new(bucket, attachment.path(style || attachment.default_style)) 
s3object.url_for(:read, :expires => expires_in) 

的選項比你指定的人略有不同。

Options Hash (options):

:expires (Object) — Sets the expiration time of the URL; after this time S3 will return an error if the URL is used. This can be an integer (to specify the number of seconds after the current time), a string (which is parsed as a date using Time#parse), a Time, or a DateTime object. This option defaults to one hour after the current time.

:secure (String) — Whether to generate a secure (HTTPS) URL or a plain HTTP url.

:response_content_type (String) — Sets the Content-Type header of the response when performing an HTTP GET on the returned URL.

:response_content_language (String) — Sets the Content-Language header of the response when performing an HTTP GET on the returned URL.

:response_expires (String) — Sets the Expires header of the response when performing an HTTP GET on the returned URL.

:response_cache_control (String) — Sets the Cache-Control header of the response when performing an HTTP GET on the returned URL.

:response_content_disposition (String) — Sets the Content-Disposition header of the response when performing an HTTP GET on the returned URL.

:response_content_encoding (String) — Sets the Content-Encoding header of the response when performing an HTTP GET on the returned URL.

Answer 3

http://docs.amazonwebservices.com/AWSRubySDK/latest/AWS/S3/S3Object.html#public_url-instance_method

Answer 4

我最近從AWS-S3到AWS-SDK開關爲好。我更換了我所有的url_for下列要求：

def authenticated_url(style = nil, expires_in = 90.minutes) 
    self.attachment.expiring_url(expires_in, (style || attachment.default_style)) 
end 

你可以看到在回形針問題的討論帖點擊這裏：https://github.com/thoughtbot/paperclip/issues/732

Answer 5

最近我升級到最新的寶石爲AWS SDK 2紅寶石（AWS-SDK -2.1.13），並且在此SDK版本中更改了預簽名url。

得到它的辦法：

presigner = Aws::S3::Presigner.new 
presigner.presigned_url(:get_object, #method 
         bucket: 'bucket-name', #name of the bucket 
         key: "key-name", #key name 
         expires_in: 7.days.to_i #time should be in seconds 
         ).to_s 

您可以在這裏找到更多的信息： http://docs.aws.amazon.com/sdkforruby/api/Aws/S3/Presigner.html