awscr-s3

A Crystal shard for S3 and compatible services.

Installation

Add this to your application's shard.yml:

dependencies:
  awscr-s3:
    github: taylorfinnell/awscr-s3

Examples

Examples

Documentation

Documentation

Usage

require "awscr-s3"

Creating a Client

client = Awscr::S3::Client.new("us-east-1", "key", "secret")

For S3 compatible services, like DigitalOcean Spaces or Minio, you'll need to set a custom endpoint:

client = Awscr::S3::Client.new("nyc3", "key", "secret", endpoint: "https://nyc3.digitaloceanspaces.com")

If you wish you wish to you version 2 request signing you may specify the signer

client = Awscr::S3::Client.new("us-east-1", "key", "secret", signer: :v2)

List Buckets

resp = client.list_buckets
resp.buckets # => ["bucket1", "bucket2"]

Delete a bucket

client = Client.new("region", "key", "secret")
resp = client.delete_bucket("test")
resp # => true

Create a bucket

client = Client.new("region", "key", "secret")
resp = client.put_bucket("test")
resp # => true

Put Object

resp = client.put_object("bucket_name", "object_key", "myobjectbody")
resp.etag # => ...

You can also pass additional headers (e.g. metadata):

client.put_object("bucket_name", "object_key", "myobjectbody", {"x-amz-meta-name" => "myobject"})

Delete Object

resp = client.delete_object("bucket_name", "object_key")
resp # => true

Check Bucket Existence

resp = client.head_bucket("bucket_name")
resp # => true

Raises an exception if bucket does not exist.

Batch Delete Objects

resp = client.batch_delete("bucket_name", ["key1", "key2"])
resp.success? # => true

Get Object

resp = client.get_object("bucket_name", "object_key")
resp.body # => myobjectbody

# Or stream the object (recommended for large objects)
client.get_object("bucket_name", "object_key") do |obj|
  IO.copy(obj.body_io, STDOUT) # => myobjectbody
end

List Objects

client.list_objects("bucket_name").each do |resp|
  p resp.contents.map(&.key)
end

Upload a file

uploader = Awscr::S3::FileUploader.new(client)

File.open(File.expand_path("myfile"), "r") do |file|
  puts uploader.upload("bucket_name", "someobjectkey", file)
end

You can also pass additional headers (e.g. metadata):

uploader = Awscr::S3::FileUploader.new(client)

File.open(File.expand_path("myfile"), "r") do |file|
  puts uploader.upload("bucket_name", "someobjectkey", file, {"x-amz-meta-name" => "myobject"})
end

Creating a Presigned::Form.

form = Awscr::S3::Presigned::Form.build("us-east-1", "access key", "secret key") do |form|
  form.expiration(Time.unix(Time.now.to_unix + 1000))
  form.condition("bucket", "mybucket")
  form.condition("acl", "public-read")
  form.condition("key", SecureRandom.uuid)
  form.condition("Content-Type", "text/plain")
  form.condition("success_action_status", "201")
end

You may use version 2 request signing via

form = Awscr::S3::Presigned::Form.build("us-east-1", "access key", "secret key", signer: :v2) do |form|
  ...
end

Converting the form to raw HTML (for browser uploads, etc).

puts form.to_html

Submitting the form.

data = IO::Memory.new("Hello, S3!")
form.submit(data)

Creating a Presigned::Url.

options = Awscr::S3::Presigned::Url::Options.new(
   aws_access_key: "key",
   aws_secret_key: "secret",
   region: "us-east-1",
   object: "test.txt",
   bucket: "mybucket",
   additional_options: {
  "Content-Type" => "image/png"
})

url = Awscr::S3::Presigned::Url.new(options)
p url.for(:put)

You may use version 2 request signing via

options = Awscr::S3::Presigned::Url::Options.new(
   aws_access_key: "key",
   aws_secret_key: "secret",
   region: "us-east-1",
   object: "test.txt",
   bucket: "mybucket",
   signer: :v2
)