Module: Paperclip::Storage::Fog

Defined in:
lib/paperclip/storage/fog.rb

Overview

fog is a modern and versatile cloud computing library for Ruby. Among others, it supports Amazon S3 to store your files. In contrast to the outdated AWS-S3 gem it is actively maintained and supports multiple locations. 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 fog-specific options for has_attached_file, which will be explained using S3 as an example:

  • fog_credentials: Takes a Hash with your credentials. For S3, you can use the following format:

    aws_access_key_id: '<your aws_access_key_id>'
aws_secret_access_key: '<your aws_secret_access_key>'
provider: 'AWS'
region: 'eu-west-1'
scheme: 'https'

  • fog_directory: 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.

  • fog_file: This can be hash or lambda returning hash. The value is used as base properties for new uploaded file.

  • 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.

  • fog_public: (optional, defaults to true) Should the uploaded files be public or not? (true/false)

  • fog_host: (optional) The fully-qualified domain name (FQDN) that is the alias to the S3 domain of your bucket, e.g. ‘images.example.com’. This can also be used in conjunction with Cloudfront (aws.amazon.com/cloudfront)

  • fog_options: (optional) A hash of options that are passed to fog when the file is created. For example, you could set the multipart-chunk size to 100MB with a hash:

    { :multipart_chunk_size => 104857600 }

Constant Summary collapse

AWS_BUCKET_SUBDOMAIN_RESTRICTON_REGEX = 
/\A(?:[a-z]|\d(?!\d{0,2}(?:\.\d{1,3}){3}\z))(?:[a-z0-9]|\.(?![\.\-])|\-(?![\.])){1,61}[a-z0-9]\z/.freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(base) ⇒ Object 



42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/paperclip/storage/fog.rb', line 42

def self.extended(base)
  unless defined?(Fog)
    begin
      require "fog"
    rescue LoadError => e
      e.message << " (You may need to install the fog gem)"
      raise e
    end
  end

  base.instance_eval do
    unless @options[:url].to_s.match(/\A:fog.*url\z/)
      @options[:path]  = @options[:path].gsub(/:url/, @options[:url]).gsub(/\A:rails_root\/public\/system\//, "")
      @options[:url]   = ":fog_public_url"
    end
    unless Paperclip::Interpolations.respond_to? :fog_public_url
      Paperclip.interpolates(:fog_public_url) do |attachment, style|
        attachment.public_url(style)
      end
    end
  end
end

Instance Method Details

#copy_to_local_file(style, local_dest_path) ⇒ Object 



178
179
180
181
182
183
184
185
186
187
188
189
 
# File 'lib/paperclip/storage/fog.rb', line 178

def copy_to_local_file(style, local_dest_path)
  log("copying #{path(style)} to local file #{local_dest_path}")
  ::File.open(local_dest_path, "wb") do |local_file|
    file = directory.files.get(path(style))
    return false unless file

    local_file.write(file.body)
  end
rescue ::Fog::Errors::Error => e
  warn("#{e} - cannot copy #{path(style)} to local file #{local_dest_path}")
  false
end

#exists?(style = default_style) ⇒ Boolean

Returns:

  • (Boolean) 


67
68
69
70
71
72
73
 
# File 'lib/paperclip/storage/fog.rb', line 67

def exists?(style = default_style)
  if original_filename
    !!directory.files.head(path(style))
  else
    false
  end
end

#expiring_url(time = (Time.now + 3600), style_name = default_style) ⇒ Object 



157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
 
# File 'lib/paperclip/storage/fog.rb', line 157

def expiring_url(time = (Time.now + 3600), style_name = default_style)
  time = convert_time(time)
  http_url_method = "get_#{scheme}_url"
  if path(style_name) && directory.files.respond_to?(http_url_method)
    expiring_url = directory.files.public_send(http_url_method, path(style_name), time)

    if @options[:fog_host]
      expiring_url.gsub!(/#{host_name_for_directory}/, dynamic_fog_host_for_style(style_name))
    end
  else
    expiring_url = url(style_name)
  end

  expiring_url
end

#flush_deletes ⇒ Object 



137
138
139
140
141
142
143
 
# File 'lib/paperclip/storage/fog.rb', line 137

def flush_deletes
  @queued_for_delete.each do |path|
    log("deleting #{path}")
    directory.files.new(key: path).destroy
  end
  @queued_for_delete = []
end

#flush_writes ⇒ Object 



107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
 
# File 'lib/paperclip/storage/fog.rb', line 107

def flush_writes
  @queued_for_write.each do |style, file|
    log("saving #{path(style)}")
    retried = false
    begin
      attributes = fog_file.merge(
        body: file,
        key: path(style),
        public: fog_public(style),
        content_type: file.content_type
      )
      attributes.merge!(@options[:fog_options]) if @options[:fog_options]
      directory.files.create(attributes)
    rescue Excon::Errors::NotFound
      raise if retried

      retried = true
      directory.save
      file.rewind
      retry
    ensure
      file.rewind
    end
  end

  after_flush_writes # allows attachment to clean up temp files

  @queued_for_write = {}
end

#fog_credentials ⇒ Object 



75
76
77
 
# File 'lib/paperclip/storage/fog.rb', line 75

def fog_credentials
  @fog_credentials ||= parse_credentials(@options[:fog_credentials])
end

#fog_file ⇒ Object 



79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/paperclip/storage/fog.rb', line 79

def fog_file
  @fog_file ||= begin
    value = @options[:fog_file]
    if !value
      {}
    elsif value.respond_to?(:call)
      value.call(self)
    else
      value
    end
  end
end

#fog_public(style = default_style) ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
105
 
# File 'lib/paperclip/storage/fog.rb', line 92

def fog_public(style = default_style)
  if @options.key?(:fog_public)
    value = @options[:fog_public]
    if value.respond_to?(:key?) && value.key?(style)
      value[style]
    elsif value.respond_to?(:call)
      value.call(self)
    else
      value
    end
  else
    true
  end
end

#parse_credentials(creds) ⇒ Object 



173
174
175
176
 
# File 'lib/paperclip/storage/fog.rb', line 173

def parse_credentials(creds)
  creds = find_credentials(creds).stringify_keys
  (creds[RailsEnvironment.get] || creds).symbolize_keys
end

#public_url(style = default_style) ⇒ Object 



145
146
147
148
149
150
151
152
153
154
155
 
# File 'lib/paperclip/storage/fog.rb', line 145

def public_url(style = default_style)
  if @options[:fog_host]
    "#{dynamic_fog_host_for_style(style)}/#{path(style)}"
  else
    if fog_credentials[:provider] == "AWS"
      "#{scheme}://#{host_name_for_directory}/#{path(style)}"
    else
      directory.files.new(key: path(style)).public_url
    end
  end
end