Module: Paperclip::Storage::S3
- Defined in:
- lib/dm-paperclip/storage/s3.rb,
lib/dm-paperclip/storage/s3/aws_library.rb,
lib/dm-paperclip/storage/s3/aws_s3_library.rb
Overview
Amazon’s S3 file hosting service is a scalable, easy place to store files for distribution. You can find out more about it at aws.amazon.com/s3. There are a few S3-specific options for has_attached_file
:
-
s3_credentials
: Takes a path, a File, or a Hash. The path (or File) must point to a YAML file containing theaccess_key_id
andsecret_access_key
that Amazon gives you. You can ‘environment-space’ this just like you do to yourdatabase.yml
file, so different environments can use different accounts:development: access_key_id: 123... secret_access_key: 123... test: access_key_id: abc... secret_access_key: abc... production: access_key_id: 456... secret_access_key: 456...
This is not required, however, and the file may simply look like this:
access_key_id: 456... secret_access_key: 456...
In which case, those access keys will be used in all environments. You can also put your bucket name in this file, instead of adding it to the code directly. This is useful when you want the same account but a different bucket for development versus production.
-
s3_permissions
: This is a String that should be one of the “canned” access policies that S3 provides (more information can be found here: docs.amazonwebservices.com/AmazonS3/2006-03-01/RESTAccessPolicy.html#RESTCannedAccessPolicies). The default for Paperclip is:public_read
. -
s3_protocol
: The protocol for the URLs generated to your S3 assets. Can be either ‘http’ or ‘https’. Defaults to ‘http’ when your:s3_permissions
are:public_read
(the default), and ‘https’ when your:s3_permissions
are anything else. -
s3_headers
: A hash of headers such as:{'Expires' => 1.year.from_now.httpdate}
-
bucket
: This is the name of the S3 bucket that will store your files. Remember that the bucket must be unique across all of Amazon S3. If the bucket does not exist Paperclip will attempt to create it. The bucket name will not be interpolated. You can define the bucket as a Proc if you want to determine it’s name at runtime. Paperclip will call that Proc with attachment as the only argument. -
s3_host_alias
: The fully-qualified domain name (FQDN) that is the alias to the S3 domain of your bucket. Used with the:s3_alias_url
url interpolation. See the link in theurl
entry for more information about S3 domains and buckets. -
url
: There are three options for the S3 url. You can choose to have the bucket’s name placed domain-style (bucket.s3.amazonaws.com) or path-style (s3.amazonaws.com/bucket). Lastly, you can specify a CNAME (which requires the CNAME to be specified as:s3_alias_url
. You can read more about CNAMEs and S3 at docs.amazonwebservices.com/AmazonS3/latest/index.html?VirtualHosting.html. Normally, this won’t matter in the slightest and you can leave the default (which is path-style, or:s3_path_url
). But in some cases paths don’t work and you need to use the domain-style (:s3_domain_url
). Anything else here will be treated like path-style. NOTE: If you use a CNAME for use with CloudFront, you can NOT specify https as your:s3_protocol
; This is *not supported* by S3/CloudFront. Finally, when using the host alias, the:bucket
parameter is ignored, as the hostname is used as the bucket name by S3. -
path
: This is the key under the bucket in which the file will be stored. The URL will be constructed from the bucket and the path. This is what you will want to interpolate. Keys should be unique, like filenames, and despite the fact that S3 (strictly speaking) does not support directories, you can still use a / to separate parts of your file name.
Defined Under Namespace
Modules: AwsLibrary, AwsS3Library
Constant Summary collapse
- LIBRARIES =
Libraries and mixins that provide S3 support
{ 'aws/s3' => AwsS3Library, 'right_aws' => AwsLibrary, 'aws' => AwsLibrary }
Class Method Summary collapse
Instance Method Summary collapse
- #bucket_name ⇒ Object
- #exists?(style = default_style) ⇒ Boolean
- #expiring_url(time = 3600) ⇒ Object
-
#flush_deletes ⇒ Object
:nodoc:.
-
#flush_writes ⇒ Object
:nodoc:.
- #parse_credentials(creds) ⇒ Object
- #s3_host_alias ⇒ Object
- #s3_protocol ⇒ Object
-
#to_file(style = default_style) ⇒ Object
Returns representation of the data of the file assigned to the given style, in the format most representative of the current storage.
Class Method Details
.extended(base) ⇒ Object
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# File 'lib/dm-paperclip/storage/s3.rb', line 89 def self.extended(base) # attempt to load one of the S3 libraries s3_detected = LIBRARIES.any? do |path,mixin| begin require path base.send :extend, mixin true rescue LoadError => e false end end unless s3_detected raise(LoadError,"unable to load any S3 library (#{LIBRARIES.keys.join(', ')})",caller) end base.instance_eval do @s3_credentials = parse_credentials(@options[:s3_credentials]) @bucket = @options[:bucket] || @s3_credentials[:bucket] @bucket = @bucket.call(self) if @bucket.is_a?(Proc) @s3_options = @options[:s3_options] || {} @s3_permissions = @options[:s3_permissions] || :public_read @s3_protocol = @options[:s3_protocol] || (@s3_permissions == :public_read ? 'http' : 'https') @s3_headers = @options[:s3_headers] || {} @s3_host_alias = @options[:s3_host_alias] unless @url.to_s.match(/^:s3.*url$/) @path = @path.gsub(/:url/, @url) @url = ":s3_path_url" end s3_connect! end Paperclip.interpolates(:s3_alias_url) do |, style| "#{.s3_protocol}://#{.s3_host_alias}/#{.path(style).gsub(%r{^/}, "")}" end unless Paperclip::Interpolations.respond_to? :s3_alias_url Paperclip.interpolates(:s3_path_url) do |, style| "#{.s3_protocol}://s3.amazonaws.com/#{.bucket_name}/#{.path(style).gsub(%r{^/}, "")}" end unless Paperclip::Interpolations.respond_to? :s3_path_url Paperclip.interpolates(:s3_domain_url) do |, style| "#{.s3_protocol}://#{.bucket_name}.s3.amazonaws.com/#{.path(style).gsub(%r{^/}, "")}" end unless Paperclip::Interpolations.respond_to? :s3_domain_url end |
Instance Method Details
#bucket_name ⇒ Object
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# File 'lib/dm-paperclip/storage/s3.rb', line 137 def bucket_name @bucket end |
#exists?(style = default_style) ⇒ Boolean
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# File 'lib/dm-paperclip/storage/s3.rb', line 150 def exists?(style = default_style) if original_filename s3_exists?(path(style)) else false end end |
#expiring_url(time = 3600) ⇒ Object
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# File 'lib/dm-paperclip/storage/s3.rb', line 133 def expiring_url(time = 3600) s3_expiring_url(path, time) end |
#flush_deletes ⇒ Object
:nodoc:
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# File 'lib/dm-paperclip/storage/s3.rb', line 185 def flush_deletes #:nodoc: @queued_for_delete.each do |path| log("deleting #{path}") s3_delete(path) end @queued_for_delete = [] end |
#flush_writes ⇒ Object
:nodoc:
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# File 'lib/dm-paperclip/storage/s3.rb', line 176 def flush_writes #:nodoc: @queued_for_write.each do |style, file| log("saving #{path(style)}") s3_store(path(style),file) end @queued_for_write = {} end |
#parse_credentials(creds) ⇒ Object
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# File 'lib/dm-paperclip/storage/s3.rb', line 145 def parse_credentials(creds) creds = DataMapper::Mash.new(find_credentials(creds)).stringify_keys! (creds[Paperclip.config.env] || creds).symbolize_keys end |
#s3_host_alias ⇒ Object
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# File 'lib/dm-paperclip/storage/s3.rb', line 141 def s3_host_alias @s3_host_alias end |
#s3_protocol ⇒ Object
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# File 'lib/dm-paperclip/storage/s3.rb', line 158 def s3_protocol @s3_protocol end |
#to_file(style = default_style) ⇒ Object
Returns representation of the data of the file assigned to the given style, in the format most representative of the current storage.
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# File 'lib/dm-paperclip/storage/s3.rb', line 164 def to_file style = default_style return @queued_for_write[style] if @queued_for_write[style] filename = path(style) extname = File.extname(filename) basename = File.basename(filename, extname) file = Tempfile.new([basename, extname]) file.binmode s3_download(filename,file) file.rewind return file end |