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module Technoweenie # :nodoc:
module AttachmentFu # :nodoc:
@@default_processors = %w(ImageScience Rmagick MiniMagick Gd2 CoreImage)
@@tempfile_path = File.join(RAILS_ROOT, 'tmp', 'attachment_fu')
@@content_types = [
'image/jpeg',
'image/pjpeg',
'image/jpg',
'image/gif',
'image/png',
'image/x-png',
'image/jpg',
'image/x-ms-bmp',
'image/bmp',
'image/x-bmp',
'image/x-bitmap',
'image/x-xbitmap',
'image/x-win-bitmap',
'image/x-windows-bmp',
'image/ms-bmp',
'application/bmp',
'application/x-bmp',
'application/x-win-bitmap',
'application/preview',
'image/jp_',
'application/jpg',
'application/x-jpg',
'image/pipeg',
'image/vnd.swiftview-jpeg',
'image/x-xbitmap',
'application/png',
'application/x-png',
'image/gi_',
'image/x-citrix-pjpeg'
]
mattr_reader :content_types, :tempfile_path, :default_processors
mattr_writer :tempfile_path
class ThumbnailError < StandardError; end
class AttachmentError < StandardError; end
module ActMethods
# Options:
# * <tt>:content_type</tt> - Allowed content types. Allows all by default. Use :image to allow all standard image types.
# * <tt>:min_size</tt> - Minimum size allowed. 1 byte is the default.
# * <tt>:max_size</tt> - Maximum size allowed. 1.megabyte is the default.
# * <tt>:size</tt> - Range of sizes allowed. (1..1.megabyte) is the default. This overrides the :min_size and :max_size options.
# * <tt>:resize_to</tt> - Used by RMagick to resize images. Pass either an array of width/height, or a geometry string.
# * <tt>:thumbnails</tt> - Specifies a set of thumbnails to generate. This accepts a hash of filename suffixes and RMagick resizing options.
# * <tt>:thumbnail_class</tt> - Set what class to use for thumbnails. This attachment class is used by default.
# * <tt>:path_prefix</tt> - path to store the uploaded files. Uses public/#{table_name} by default for the filesystem, and just #{table_name}
# for the S3 backend. Setting this sets the :storage to :file_system.
# * <tt>:storage</tt> - Use :file_system to specify the attachment data is stored with the file system. Defaults to :db_system.
# * <tt>:keep_profile</tt> By default image EXIF data will be stripped to minimize image size. For small thumbnails this proivides important savings. Picture quality is not affected. Set to false if you want to keep the image profile as is. ImageScience will allways keep EXIF data.
#
# Examples:
# has_attachment :max_size => 1.kilobyte
# has_attachment :size => 1.megabyte..2.megabytes
# has_attachment :content_type => 'application/pdf'
# has_attachment :content_type => ['application/pdf', 'application/msword', 'text/plain']
# has_attachment :content_type => :image, :resize_to => [50,50]
# has_attachment :content_type => ['application/pdf', :image], :resize_to => 'x50'
# has_attachment :thumbnails => { :thumb => [50, 50], :geometry => 'x50' }
# has_attachment :storage => :file_system, :path_prefix => 'public/files'
# has_attachment :storage => :file_system, :path_prefix => 'public/files',
# :content_type => :image, :resize_to => [50,50]
# has_attachment :storage => :file_system, :path_prefix => 'public/files',
# :thumbnails => { :thumb => [50, 50], :geometry => 'x50' }
# has_attachment :storage => :s3
def has_attachment(options = {})
# this allows you to redefine the acts' options for each subclass, however
options[:min_size] ||= 1
options[:max_size] ||= 1.megabyte
options[:size] ||= (options[:min_size]..options[:max_size])
options[:thumbnails] ||= {}
options[:thumbnail_class] ||= self
options[:s3_access] ||= :public_read
options[:content_type] = [options[:content_type]].flatten.collect! { |t| t == :image ? Technoweenie::AttachmentFu.content_types : t }.flatten unless options[:content_type].nil?
unless options[:thumbnails].is_a?(Hash)
raise ArgumentError, ":thumbnails option should be a hash: e.g. :thumbnails => { :foo => '50x50' }"
end
extend ClassMethods unless (class << self; included_modules; end).include?(ClassMethods)
include InstanceMethods unless included_modules.include?(InstanceMethods)
parent_options = attachment_options || {}
# doing these shenanigans so that #attachment_options is available to processors and backends
self.attachment_options = options
attr_accessor :thumbnail_resize_options
attachment_options[:storage] ||= (attachment_options[:file_system_path] || attachment_options[:path_prefix]) ? :file_system : :db_file
attachment_options[:storage] ||= parent_options[:storage]
attachment_options[:path_prefix] ||= attachment_options[:file_system_path]
if attachment_options[:path_prefix].nil?
attachment_options[:path_prefix] = attachment_options[:storage] == :s3 ? table_name : File.join("public", table_name)
end
attachment_options[:path_prefix] = attachment_options[:path_prefix][1..-1] if options[:path_prefix].first == '/'
with_options :foreign_key => 'parent_id' do |m|
m.has_many :thumbnails, :class_name => "::#{attachment_options[:thumbnail_class]}"
m.belongs_to :parent, :class_name => "::#{base_class}" unless options[:thumbnails].empty?
end
storage_mod = Technoweenie::AttachmentFu::Backends.const_get("#{options[:storage].to_s.classify}Backend")
include storage_mod unless included_modules.include?(storage_mod)
case attachment_options[:processor]
when :none, nil
processors = Technoweenie::AttachmentFu.default_processors.dup
begin
if processors.any?
attachment_options[:processor] = "#{processors.first}Processor"
processor_mod = Technoweenie::AttachmentFu::Processors.const_get(attachment_options[:processor])
include processor_mod unless included_modules.include?(processor_mod)
end
rescue Object, Exception
raise unless load_related_exception?($!)
processors.shift
retry
end
else
begin
processor_mod = Technoweenie::AttachmentFu::Processors.const_get("#{attachment_options[:processor].to_s.classify}Processor")
include processor_mod unless included_modules.include?(processor_mod)
rescue Object, Exception
raise unless load_related_exception?($!)
puts "Problems loading #{options[:processor]}Processor: #{$!}"
end
end unless parent_options[:processor] # Don't let child override processor
end
def load_related_exception?(e) #:nodoc: implementation specific
case
when e.kind_of?(LoadError), e.kind_of?(MissingSourceFile), $!.class.name == "CompilationError"
# We can't rescue CompilationError directly, as it is part of the RubyInline library.
# We must instead rescue RuntimeError, and check the class' name.
true
else
false
end
end
private :load_related_exception?
end
module ClassMethods
delegate :content_types, :to => Technoweenie::AttachmentFu
# Performs common validations for attachment models.
def validates_as_attachment
validates_presence_of :size, :content_type, :filename
validate :attachment_attributes_valid?
end
# Returns true or false if the given content type is recognized as an image.
def image?(content_type)
content_types.include?(content_type)
end
def self.extended(base)
base.class_inheritable_accessor :attachment_options
base.before_destroy :destroy_thumbnails
base.before_validation :set_size_from_temp_path
base.after_save :after_process_attachment
base.after_destroy :destroy_file
base.after_validation :process_attachment
base.attr_accessible :uploaded_data
if defined?(::ActiveSupport::Callbacks)
base.define_callbacks :after_resize, :after_attachment_saved, :before_thumbnail_saved
end
end
unless defined?(::ActiveSupport::Callbacks)
# Callback after an image has been resized.
#
# class Foo < ActiveRecord::Base
# acts_as_attachment
# after_resize do |record, img|
# record.aspect_ratio = img.columns.to_f / img.rows.to_f
# end
# end
def after_resize(&block)
write_inheritable_array(:after_resize, [block])
end
# Callback after an attachment has been saved either to the file system or the DB.
# Only called if the file has been changed, not necessarily if the record is updated.
#
# class Foo < ActiveRecord::Base
# acts_as_attachment
# after_attachment_saved do |record|
# ...
# end
# end
def after_attachment_saved(&block)
write_inheritable_array(:after_attachment_saved, [block])
end
# Callback before a thumbnail is saved. Use this to pass any necessary extra attributes that may be required.
#
# class Foo < ActiveRecord::Base
# acts_as_attachment
# before_thumbnail_saved do |thumbnail|
# record = thumbnail.parent
# ...
# end
# end
def before_thumbnail_saved(&block)
write_inheritable_array(:before_thumbnail_saved, [block])
end
end
# Get the thumbnail class, which is the current attachment class by default.
# Configure this with the :thumbnail_class option.
def thumbnail_class
attachment_options[:thumbnail_class] = attachment_options[:thumbnail_class].constantize unless attachment_options[:thumbnail_class].is_a?(Class)
attachment_options[:thumbnail_class]
end
# Copies the given file path to a new tempfile, returning the closed tempfile.
def copy_to_temp_file(file, temp_base_name)
returning Tempfile.new(temp_base_name, Technoweenie::AttachmentFu.tempfile_path) do |tmp|
tmp.close
FileUtils.cp file, tmp.path
end
end
# Writes the given data to a new tempfile, returning the closed tempfile.
def write_to_temp_file(data, temp_base_name)
returning Tempfile.new(temp_base_name, Technoweenie::AttachmentFu.tempfile_path) do |tmp|
tmp.binmode
tmp.write data
tmp.close
end
end
end
module InstanceMethods
def self.included(base)
base.define_callbacks *[:after_resize, :after_attachment_saved, :before_thumbnail_saved] if base.respond_to?(:define_callbacks)
end
# Checks whether the attachment's content type is an image content type
def image?
self.class.image?(content_type)
end
# Returns true/false if an attachment is thumbnailable. A thumbnailable attachment has an image content type and the parent_id attribute.
def thumbnailable?
image? && respond_to?(:parent_id) && parent_id.nil?
end
# Returns the class used to create new thumbnails for this attachment.
def thumbnail_class
self.class.thumbnail_class
end
# Gets the thumbnail name for a filename. 'foo.jpg' becomes 'foo_thumbnail.jpg'
def thumbnail_name_for(thumbnail = nil)
return filename if thumbnail.blank?
ext = nil
basename = filename.gsub /\.\w+$/ do |s|
ext = s; ''
end
# ImageScience doesn't create gif thumbnails, only pngs
ext.sub!(/gif$/, 'png') if attachment_options[:processor] == "ImageScience"
"#{basename}_#{thumbnail}#{ext}"
end
# Creates or updates the thumbnail for the current attachment.
def create_or_update_thumbnail(temp_file, file_name_suffix, *size)
thumbnailable? || raise(ThumbnailError.new("Can't create a thumbnail if the content type is not an image or there is no parent_id column"))
returning find_or_initialize_thumbnail(file_name_suffix) do |thumb|
thumb.temp_paths.unshift temp_file
thumb.send(:'attributes=', {
:content_type => content_type,
:filename => thumbnail_name_for(file_name_suffix),
:thumbnail_resize_options => size
}, false)
callback_with_args :before_thumbnail_saved, thumb
thumb.save!
end
end
# Sets the content type.
def content_type=(new_type)
write_attribute :content_type, new_type.to_s.strip
end
# Sanitizes a filename.
def filename=(new_name)
write_attribute :filename, sanitize_filename(new_name)
end
# Returns the width/height in a suitable format for the image_tag helper: (100x100)
def image_size
[width.to_s, height.to_s] * 'x'
end
# Returns true if the attachment data will be written to the storage system on the next save
def save_attachment?
File.file?(temp_path.to_s)
end
# nil placeholder in case this field is used in a form.
def uploaded_data() nil; end
# This method handles the uploaded file object. If you set the field name to uploaded_data, you don't need
# any special code in your controller.
#
# <% form_for :attachment, :html => { :multipart => true } do |f| -%>
# <p><%= f.file_field :uploaded_data %></p>
# <p><%= submit_tag :Save %>
# <% end -%>
#
# @attachment = Attachment.create! params[:attachment]
#
# TODO: Allow it to work with Merb tempfiles too.
def uploaded_data=(file_data)
if file_data.respond_to?(:content_type)
return nil if file_data.size == 0
self.content_type = file_data.content_type
self.filename = file_data.original_filename if respond_to?(:filename)
else
return nil if file_data.blank? || file_data['size'] == 0
self.content_type = file_data['content_type']
self.filename = file_data['filename']
file_data = file_data['tempfile']
end
if file_data.is_a?(StringIO)
file_data.rewind
set_temp_data file_data.read
else
self.temp_paths.unshift file_data
end
end
# Gets the latest temp path from the collection of temp paths. While working with an attachment,
# multiple Tempfile objects may be created for various processing purposes (resizing, for example).
# An array of all the tempfile objects is stored so that the Tempfile instance is held on to until
# it's not needed anymore. The collection is cleared after saving the attachment.
def temp_path
p = temp_paths.first
p.respond_to?(:path) ? p.path : p.to_s
end
# Gets an array of the currently used temp paths. Defaults to a copy of #full_filename.
def temp_paths
@temp_paths ||= (new_record? || !respond_to?(:full_filename) || !File.exist?(full_filename) ?
[] : [copy_to_temp_file(full_filename)])
end
# Gets the data from the latest temp file. This will read the file into memory.
def temp_data
save_attachment? ? File.read(temp_path) : nil
end
# Writes the given data to a Tempfile and adds it to the collection of temp files.
def set_temp_data(data)
temp_paths.unshift write_to_temp_file data unless data.nil?
end
# Copies the given file to a randomly named Tempfile.
def copy_to_temp_file(file)
self.class.copy_to_temp_file file, random_tempfile_filename
end
# Writes the given file to a randomly named Tempfile.
def write_to_temp_file(data)
self.class.write_to_temp_file data, random_tempfile_filename
end
# Stub for creating a temp file from the attachment data. This should be defined in the backend module.
def create_temp_file() end
# Allows you to work with a processed representation (RMagick, ImageScience, etc) of the attachment in a block.
#
# @attachment.with_image do |img|
# self.data = img.thumbnail(100, 100).to_blob
# end
#
def with_image(&block)
self.class.with_image(temp_path, &block)
end
protected
# Generates a unique filename for a Tempfile.
def random_tempfile_filename
"#{rand Time.now.to_i}#{filename || 'attachment'}"
end
def sanitize_filename(filename)
return unless filename
returning filename.strip do |name|
# NOTE: File.basename doesn't work right with Windows paths on Unix
# get only the filename, not the whole path
name.gsub! /^.*(\\|\/)/, ''
# Finally, replace all non alphanumeric, underscore or periods with underscore
name.gsub! /[^A-Za-z0-9\.\-]/, '_'
end
end
# before_validation callback.
def set_size_from_temp_path
self.size = File.size(temp_path) if save_attachment?
end
# validates the size and content_type attributes according to the current model's options
def attachment_attributes_valid?
[:size, :content_type].each do |attr_name|
enum = attachment_options[attr_name]
errors.add attr_name, ActiveRecord::Errors.default_error_messages[:inclusion] unless enum.nil? || enum.include?(send(attr_name))
end
end
# Initializes a new thumbnail with the given suffix.
def find_or_initialize_thumbnail(file_name_suffix)
respond_to?(:parent_id) ?
thumbnail_class.find_or_initialize_by_thumbnail_and_parent_id(file_name_suffix.to_s, id) :
thumbnail_class.find_or_initialize_by_thumbnail(file_name_suffix.to_s)
end
# Stub for a #process_attachment method in a processor
def process_attachment
@saved_attachment = save_attachment?
end
# Cleans up after processing. Thumbnails are created, the attachment is stored to the backend, and the temp_paths are cleared.
def after_process_attachment
if @saved_attachment
if respond_to?(:process_attachment_with_processing) && thumbnailable? && !attachment_options[:thumbnails].blank? && parent_id.nil?
temp_file = temp_path || create_temp_file
attachment_options[:thumbnails].each { |suffix, size| create_or_update_thumbnail(temp_file, suffix, *size) }
end
save_to_storage
@temp_paths.clear
@saved_attachment = nil
callback :after_attachment_saved
end
end
# Resizes the given processed img object with either the attachment resize options or the thumbnail resize options.
def resize_image_or_thumbnail!(img)
if (!respond_to?(:parent_id) || parent_id.nil?) && attachment_options[:resize_to] # parent image
resize_image(img, attachment_options[:resize_to])
elsif thumbnail_resize_options # thumbnail
resize_image(img, thumbnail_resize_options)
end
end
# Yanked from ActiveRecord::Callbacks, modified so I can pass args to the callbacks besides self.
# Only accept blocks, however
if ActiveSupport.const_defined?(:Callbacks)
# Rails 2.1 and beyond!
def callback_with_args(method, arg = self)
notify(method)
result = run_callbacks(method, { :object => arg }) { |result, object| result == false }
if result != false && respond_to_without_attributes?(method)
result = send(method)
end
result
end
def run_callbacks(kind, options = {}, &block)
options.reverse_merge!( :object => self )
self.class.send("#{kind}_callback_chain").run(options[:object], options, &block)
end
else
# Rails 2.0
def callback_with_args(method, arg = self)
notify(method)
result = nil
callbacks_for(method).each do |callback|
result = callback.call(self, arg)
return false if result == false
end
result
end
end
# Removes the thumbnails for the attachment, if it has any
def destroy_thumbnails
self.thumbnails.each { |thumbnail| thumbnail.destroy } if thumbnailable?
end
end
end
end
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