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domain_file_version.rb
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domain_file_version.rb
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# Copyright (C) 2009 Pascal Rettig.
require "digest/sha1"
class DomainFileVersion < DomainModel
belongs_to :domain_file
serialize :meta_info
after_destroy :erase_version_file
after_create :move_version_file # Move file original file to the version location
belongs_to :creator, :class_name => 'EndUser',:foreign_key => 'creator_id'
def self.archive(file)
if !file.processor_handler.revision_support
begin
file.destroy_thumbs
File.unlink(file.filename)
rescue Exception => e
raise e
# Chomp
end
return
end
info = {}
if file.image_size
info[:image_size] = { :width => file.width, :height => file.height }
end
version_hash = self.generate_version_hash
file.processor_handler.destroy_remote! # get rid of remote copies of this file
file.filename # copy file locally
# Create a new instance with the correct file attributes
v = DomainFileVersion.create(:domain_file => file,
:filename => file.read_attribute(:filename),
:file_type => file.file_type,
:meta_info => info,
:extension => file.extension,
:prefix => self.generate_version_prefix(file.prefix,version_hash),
:file_size => file.file_size,
:creator_id => file.creator_id,
:version_hash => version_hash,
:stored_at => file.stored_at,
:server_id => Server.server_id)
end
# Create a domain file from this file
def extract(user_id=nil)
self.copy_local!
return nil unless File.exists?(self.abs_filename)
df = DomainFile.new(:parent_id => self.domain_file.parent_id, :creator_id => user_id || self.creator_id, :private => self.domain_file.private, :process_immediately => true)
File.open(self.abs_filename,"rb") do |f|
df.filename = f
if(df.save)
return df
end
end
end
def extract_file(options={})
file = self.extract
{:domain_file_id => file.id} if file
end
def prefixed_filename
# unless we have a filename, return false
atr = self.read_attribute(:filename)
return nil unless self.prefix && atr
"#{DomainFile.storage_subdir}/#{self.prefix}/#{atr}"
end
def relative_filename
# unless we have a filename, return false
atr = self.read_attribute(:filename)
return nil unless self.prefix && atr
self.storage_directory + atr
end
# Return the absolute storage directory - valid for opening a file on the server
# Return the relative storage directory
# Thumbnails are stored in subdirectories prefixed with the file size (../small/file.jpg)
def abs_filename; "#{RAILS_ROOT}/public" + self.relative_filename; end
alias_method :filename, :abs_filename
def name
self.read_attribute(:filename)
end
def storage_directory; self.storage_base + "/" + self.prefix + "/"; end
def abs_storage_directory; "#{RAILS_ROOT}/public" + self.storage_base + "/" + self.prefix + "/"; end
def storage_base; self.domain_file.private? ? DomainFile.private_storage_base : DomainFile.public_storage_base; end
def url
if domain_file.processor != 'local'
self.domain_file.processor_handler.version_url(self)
else
relative_filename
end
end
###########
# Hooks
###########
def erase_version_file
self.domain_file.processor_handler.destroy_remote_version!(self)
if !prefix.blank? && (File.directory?(abs_storage_directory))
FileUtils.rm_rf(abs_storage_directory)
end
end
def move_version_file
FileUtils.mkpath(self.abs_storage_directory)
File.mv(self.domain_file.filename,self.filename)
self.domain_file.destroy_thumbs
self.domain_file.processor_handler.create_remote_version!(self) if self.domain_file.processor != 'local'
end
def width
return nil unless self.meta_info[:image_size]
self.meta_info[:image_size][:width]
end
def height
return nil unless self.meta_info[:image_size]
self.meta_info[:image_size][:height]
end
def server
@server ||= Server.find_by_id(self.server_id) if self.server_id
end
def copy_local!
self.domain_file.processor_handler.respond_to?('copy_version_local!') ? self.domain_file.processor_handler.copy_version_local!(self) : false
end
protected
def self.generate_version_hash
now = Time.now
digest = Digest::SHA1.hexdigest("#{now}#{rand}#{now.usec}#{Process.pid}")[0..31]
end
def self.generate_version_prefix(prefix,version_hash)
"#{prefix}/v/#{version_hash}"
end
end