如何检查 AWS S3bucket 中是否存在资源

Question

我有一个 AWS S3 存储桶，其中有多个文件夹。

s3 = AWS::S3.new
bucket =  s3.buckets['test']
bucket.exists? => true

假设我有一个名为 demo/index.html 的资源，我将如何检查此资源是否存在于 this bucket 中？

可能是我的问题太简单了，但我找不到合适的答案。感谢任何帮助。

Answer 1

#存在吗？ ⇒ 布尔值

Returns true if the object exists in S3.

# new object, does not exist yet
obj = bucket.objects["my-text-object"]
# no instruction file present
begin
  bucket.objects['my-text-object.instruction'].exists? #=> false
rescue
  # exists? can raise an error `Aws::S3::Errors::Forbidden`
end


# store the encryption materials in the instruction file
# instead of obj#metadata
obj.write("MY TEXT",
  :encryption_key => MY_KEY,
  :encryption_materials_location => :instruction_file)

begin
  bucket.objects['my-text-object.instruction'].exists? #=> true
rescue
  # exists? can raise an error `Aws::S3::Errors::Forbidden`
end

http://docs.aws.amazon.com/AWSRubySDK/latest/AWS/S3/S3Object.html#exists%3F-instance_method

如何检查 AWS S3bucket 中是否存在资源

How to check if a resource exists in an AWS S3bucket

ruby

aws-sdk