Ruby S3 Examples¶

Creating a Connection¶

This creates a connection so that you can interact with the server.

AWS::S3::Base.establish_connection!(
        :server            => 'objects.dreamhost.com',
        :use_ssl           => true,
        :access_key_id     => 'my-access-key',
        :secret_access_key => 'my-secret-key'
)

Listing Owned Buckets¶

This gets a list of AWS::S3::Bucket objects that you own. This also prints out the bucket name and creation date of each bucket.

AWS::S3::Service.buckets.each do |bucket|
        puts "#{bucket.name}\t#{bucket.creation_date}"
end

The output will look something like this:

mahbuckat1   2011-04-21T18:05:39.000Z
mahbuckat2   2011-04-21T18:05:48.000Z
mahbuckat3   2011-04-21T18:07:18.000Z

Creating a Bucket¶

This creates a new bucket called my-new-bucket

AWS::S3::Bucket.create('my-new-bucket')

Listing a Bucket’s Content¶

This gets a list of hashes with the contents of each object This also prints out each object’s name, the file size, and last modified date.

new_bucket = AWS::S3::Bucket.find('my-new-bucket')
new_bucket.each do |object|
        puts "#{object.key}\t#{object.about['content-length']}\t#{object.about['last-modified']}"
end

The output will look something like this if the bucket has some files:

myphoto1.jpg 251262  2011-08-08T21:35:48.000Z
myphoto2.jpg 262518  2011-08-08T21:38:01.000Z

Deleting a Bucket¶

Note

The Bucket must be empty! Otherwise it won’t work!

AWS::S3::Bucket.delete('my-new-bucket')

Forced Delete for Non-empty Buckets¶

AWS::S3::Bucket.delete('my-new-bucket', :force => true)

Creating an Object¶

This creates a file hello.txt with the string "Hello World!"

AWS::S3::S3Object.store(
        'hello.txt',
        'Hello World!',
        'my-new-bucket',
        :content_type => 'text/plain'
)

Change an Object’s ACL¶

This makes the object hello.txt to be publicly readable, and secret_plans.txt to be private.

policy = AWS::S3::S3Object.acl('hello.txt', 'my-new-bucket')
policy.grants = [ AWS::S3::ACL::Grant.grant(:public_read) ]
AWS::S3::S3Object.acl('hello.txt', 'my-new-bucket', policy)

policy = AWS::S3::S3Object.acl('secret_plans.txt', 'my-new-bucket')
policy.grants = []
AWS::S3::S3Object.acl('secret_plans.txt', 'my-new-bucket', policy)

Download an Object (to a file)¶

This downloads the object poetry.pdf and saves it in /home/larry/documents/

open('/home/larry/documents/poetry.pdf', 'w') do |file|
        AWS::S3::S3Object.stream('poetry.pdf', 'my-new-bucket') do |chunk|
                file.write(chunk)
        end
end

Delete an Object¶

This deletes the object goodbye.txt

AWS::S3::S3Object.delete('goodbye.txt', 'my-new-bucket')

Generate Object Download URLs (signed and unsigned)¶

This generates an unsigned download URL for hello.txt. This works because we made hello.txt public by setting the ACL above. This then generates a signed download URL for secret_plans.txt that will work for 1 hour. Signed download URLs will work for the time period even if the object is private (when the time period is up, the URL will stop working).

puts AWS::S3::S3Object.url_for(
        'hello.txt',
        'my-new-bucket',
        :authenticated => false
)

puts AWS::S3::S3Object.url_for(
        'secret_plans.txt',
        'my-new-bucket',
        :expires_in => 60 * 60
)

The output of this will look something like:

http://objects.dreamhost.com/my-bucket-name/hello.txt
http://objects.dreamhost.com/my-bucket-name/secret_plans.txt?Signature=XXXXXXXXXXXXXXXXXXXXXXXXXXX&Expires=1316027075&AWSAccessKeyId=XXXXXXXXXXXXXXXXXXX

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