Check if file exists in S3 bucket with Ruby aws-sdk gem

verify_s3_file.rb

require 'aws-sdk'
  
s3 = Aws::S3::Resource.new(
  region: 'us-east-1',
  credentials: Aws::InstanceProfileCredentials.new()
)
bucket =  s3.bucket('my-daily-backups')

file = (DateTime.now).strftime("%Y.%m.%d-backup")
if bucket.object(file).exists?
  puts "File '/my-daily-backups/#{file}' is present in S3 bucket!"
else
  puts "File '/my-daily-backups/#{file}' is not in S3 bucket!"
end

Thanks, just what I was looking for!

I had a weird situation where exists? would return true but there would be no meaningful file. Another check that's valuable is to use bucket.object(file).content_length.zero?.

Thanks, very helpful. Make my way to there as blow.

File url s3://51-alien-test/cover/51.pdf

s3 = Aws::S3::Resource.new(region: 'us-central-51', access_key_id: 'xxxx', secret_access_key: 'xxxxx')
bucket = s3.bucket('51-alien-test')
bucket.object('cover/51.pdf').exists?

Thank you!! ヽ(^◇^*)/

And anyone getting Exceptions instead of a Boolean result, check this aws/aws-sdk-ruby#201 (comment).

If you don't ahve permission on the object that are you checking, the result it'll be false every time. So it's not an helpful script.

collect=bucket.objects(prefix: _object).collect(&:key)
      p collect
      collect.each do |item|
        if(item==_object)
          return render json: true
        end
      end
return render json: false
`

Thanks, it's helpful for me!

Life saver! Thank you!