AWS Fixity Example

aws_etag_md5.rb

[1] pry(main)> require 'aws-sdk-s3'
=> true
[2] pry(main)> require 'digest/md5'
=> true
[3] pry(main)>
[4] pry(main)> obj = Aws::S3::Object.new(bucket_name: 'avr-masterfiles-staging-rd56wk8', key: 'preservation/b2/77/3w/17/b2773w177/1_Sec_audio.ogg')
=> #<Aws::S3::Object:0x00007fe902b147f0
 @bucket_name="avr-masterfiles-staging-rd56wk8",
 @client=#<Aws::S3::Client>,
 @data=nil,
 @key="preservation/b2/77/3w/17/b2773w177/1_Sec_audio.ogg">
[5] pry(main)> obj.etag
=> "\"00e54f93a1b6edd40685dc303f6a17c9\""
[6] pry(main)>
[7] pry(main)> md5 = Digest::MD5.new
=> #<Digest::MD5: d41d8cd98f00b204e9800998ecf8427e>
[8] pry(main)> obj.get { |chunk| md5 << chunk }
=> #<struct Aws::S3::Types::GetObjectOutput
 body=#<Seahorse::Client::BlockIO:0x00007fe903c177a0 @block=#<Proc:0x00007fe903bd5f80@(pry):6>, @size=3188734>,
 delete_marker=nil,
 accept_ranges="bytes",
 expiration=nil,
 restore=nil,
 last_modified=2018-04-30 19:57:52 +0000,
 content_length=3188734,
 etag="\"00e54f93a1b6edd40685dc303f6a17c9\"",
 missing_meta=nil,
 version_id=nil,
 cache_control=nil,
 content_disposition=nil,
 content_encoding=nil,
 content_language=nil,
 content_range=nil,
 content_type="binary/octet-stream",
 expires=nil,
 expires_string=nil,
 website_redirect_location=nil,
 server_side_encryption=nil,
 metadata={},
 sse_customer_algorithm=nil,
 sse_customer_key_md5=nil,
 ssekms_key_id=nil,
 storage_class=nil,
 request_charged=nil,
 replication_status=nil,
 parts_count=nil,
 tag_count=nil>
[9] pry(main)> md5.to_s
=> "00e54f93a1b6edd40685dc303f6a17c9"
[10] pry(main)>