module Paperclip
module Storage
# The default place to store attachments is in the filesystem. Files on the local
# filesystem can be very easily served by Apache without requiring a hit to your app.
# They also can be processed more easily after they've been saved, as they're just
# normal files. There is one Filesystem-specific option for has_attached_file.
# * +path+: The location of the repository of attachments on disk. This can (and, in
# almost all cases, should) be coordinated with the value of the +url+ option to
# allow files to be saved into a place where Apache can serve them without
# hitting your app. Defaults to
# ":rails_root/public/:attachment/:id/:style/:basename.:extension"
# By default this places the files in the app's public directory which can be served
# directly. If you are using capistrano for deployment, a good idea would be to
# make a symlink to the capistrano-created system directory from inside your app's
# public directory.
# See Paperclip::Attachmenta#interpolate for more information on variable interpolaton.
# :path => "/var/app/attachments/:class/:id/:style/:basename.:extension"
module Filesystem
def self.extended base
end
def exists?(style_name = default_style)
if original_filename
File.exist?(path(style_name))
else
false
end
end
# Returns representation of the data of the file assigned to the given
# style, in the format most representative of the current storage.
def to_file style_name = default_style
@queued_for_write[style_name] || (File.new(path(style_name), 'rb') if exists?(style_name))
end
def flush_writes #:nodoc:
@queued_for_write.each do |style_name, file|
file.close
FileUtils.mkdir_p(File.dirname(path(style_name)))
log("saving #{path(style_name)}")
FileUtils.mv(file.path, path(style_name))
FileUtils.chmod(0644, path(style_name))
end
@queued_for_write = {}
end
def flush_deletes #:nodoc:
@queued_for_delete.each do |path|
begin
log("deleting #{path}")
FileUtils.rm(path) if File.exist?(path)
rescue Errno::ENOENT => e
# ignore file-not-found, let everything else pass
end
begin
while(true)
path = File.dirname(path)
FileUtils.rmdir(path)
end
rescue Errno::EEXIST, Errno::ENOTEMPTY, Errno::ENOENT, Errno::EINVAL, Errno::ENOTDIR
# Stop trying to remove parent directories
rescue SystemCallError => e
log("There was an unexpected error while deleting directories: #{e.class}")
# Ignore it
end
end
@queued_for_delete = []
end
end
# Amazon's S3 file hosting service is a scalable, easy place to store files for
# distribution. You can find out more about it at http://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 the +access_key_id+ and +secret_access_key+ that Amazon
# gives you. You can 'environment-space' this just like you do to your
# database.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:
# http://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 the +url+ 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
# http://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.
module S3
def self.extended base
begin
require 'aws/s3'
rescue LoadError => e
e.message << " (You may need to install the aws-s3 gem)"
raise e
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]
@url = ":s3_path_url" unless @url.to_s.match(/^:s3.*url$/)
AWS::S3::Base.establish_connection!( @s3_options.merge(
:access_key_id => @s3_credentials[:access_key_id],
:secret_access_key => @s3_credentials[:secret_access_key]
))
end
Paperclip.interpolates(:s3_alias_url) do |attachment, style|
"#{attachment.s3_protocol}://#{attachment.s3_host_alias}/#{attachment.path(style).gsub(%r{^/}, "")}"
end
Paperclip.interpolates(:s3_path_url) do |attachment, style|
"#{attachment.s3_protocol}://s3.amazonaws.com/#{attachment.bucket_name}/#{attachment.path(style).gsub(%r{^/}, "")}"
end
Paperclip.interpolates(:s3_domain_url) do |attachment, style|
"#{attachment.s3_protocol}://#{attachment.bucket_name}.s3.amazonaws.com/#{attachment.path(style).gsub(%r{^/}, "")}"
end
end
def expiring_url(time = 3600)
AWS::S3::S3Object.url_for(path, bucket_name, :expires_in => time )
end
def bucket_name
@bucket
end
def s3_host_alias
@s3_host_alias
end
def parse_credentials creds
creds = find_credentials(creds).stringify_keys
(creds[RAILS_ENV] || creds).symbolize_keys
end
def exists?(style = default_style)
if original_filename
AWS::S3::S3Object.exists?(path(style), bucket_name)
else
false
end
end
def s3_protocol
@s3_protocol
end
# Returns representation of the data of the file assigned to the given
# style, in the format most representative of the current storage.
def to_file style = default_style
return @queued_for_write[style] if @queued_for_write[style]
file = Tempfile.new(path(style))
file.write(AWS::S3::S3Object.value(path(style), bucket_name))
file.rewind
return file
end
def flush_writes #:nodoc:
@queued_for_write.each do |style, file|
begin
log("saving #{path(style)}")
AWS::S3::S3Object.store(path(style),
file,
bucket_name,
{:content_type => instance_read(:content_type),
:access => @s3_permissions,
}.merge(@s3_headers))
rescue AWS::S3::ResponseError => e
raise
end
end
@queued_for_write = {}
end
def flush_deletes #:nodoc:
@queued_for_delete.each do |path|
begin
log("deleting #{path}")
AWS::S3::S3Object.delete(path, bucket_name)
rescue AWS::S3::ResponseError
# Ignore this.
end
end
@queued_for_delete = []
end
def find_credentials creds
case creds
when File
YAML::load(ERB.new(File.read(creds.path)).result)
when String
YAML::load(ERB.new(File.read(creds)).result)
when Hash
creds
else
raise ArgumentError, "Credentials are not a path, file, or hash."
end
end
private :find_credentials
end
end
end