+++ /dev/null
-module FileColumn
- module Validations #:nodoc:
-
- def self.append_features(base)
- super
- base.extend(ClassMethods)
- end
-
- # This module contains methods to create validations of uploaded files. All methods
- # in this module will be included as class methods into <tt>ActiveRecord::Base</tt>
- # so that you can use them in your models like this:
- #
- # class Entry < ActiveRecord::Base
- # file_column :image
- # validates_filesize_of :image, :in => 0..1.megabyte
- # end
- module ClassMethods
- EXT_REGEXP = /\.([A-z0-9]+)$/
-
- # This validates the file type of one or more file_columns. A list of file columns
- # should be given followed by an options hash.
- #
- # Required options:
- # * <tt>:in</tt> => list of extensions or mime types. If mime types are used they
- # will be mapped into an extension via FileColumn::ClassMethods::MIME_EXTENSIONS.
- #
- # Examples:
- # validates_file_format_of :field, :in => ["gif", "png", "jpg"]
- # validates_file_format_of :field, :in => ["image/jpeg"]
- def validates_file_format_of(*attrs)
-
- options = attrs.pop if attrs.last.is_a?Hash
- raise ArgumentError, "Please include the :in option." if !options || !options[:in]
- options[:in] = [options[:in]] if options[:in].is_a?String
- raise ArgumentError, "Invalid value for option :in" unless options[:in].is_a?Array
-
- validates_each(attrs, options) do |record, attr, value|
- unless value.blank?
- mime_extensions = record.send("#{attr}_options")[:mime_extensions]
- extensions = options[:in].map{|o| mime_extensions[o] || o }
- record.errors.add attr, "is not a valid format." unless extensions.include?(value.scan(EXT_REGEXP).flatten.first)
- end
- end
-
- end
-
- # This validates the file size of one or more file_columns. A list of file columns
- # should be given followed by an options hash.
- #
- # Required options:
- # * <tt>:in</tt> => A size range. Note that you can use ActiveSupport's
- # numeric extensions for kilobytes, etc.
- #
- # Examples:
- # validates_filesize_of :field, :in => 0..100.megabytes
- # validates_filesize_of :field, :in => 15.kilobytes..1.megabyte
- def validates_filesize_of(*attrs)
-
- options = attrs.pop if attrs.last.is_a?Hash
- raise ArgumentError, "Please include the :in option." if !options || !options[:in]
- raise ArgumentError, "Invalid value for option :in" unless options[:in].is_a?Range
-
- validates_each(attrs, options) do |record, attr, value|
- unless value.blank?
- size = File.size(value)
- record.errors.add attr, "is smaller than the allowed size range." if size < options[:in].first
- record.errors.add attr, "is larger than the allowed size range." if size > options[:in].last
- end
- end
-
- end
-
- IMAGE_SIZE_REGEXP = /^(\d+)x(\d+)$/
-
- # Validates the image size of one or more file_columns. A list of file columns
- # should be given followed by an options hash. The validation will pass
- # if both image dimensions (rows and columns) are at least as big as
- # given in the <tt>:min</tt> option.
- #
- # Required options:
- # * <tt>:min</tt> => minimum image dimension string, in the format NNxNN
- # (columns x rows).
- #
- # Example:
- # validates_image_size :field, :min => "1200x1800"
- #
- # This validation requires RMagick to be installed on your system
- # to check the image's size.
- def validates_image_size(*attrs)
- options = attrs.pop if attrs.last.is_a?Hash
- raise ArgumentError, "Please include a :min option." if !options || !options[:min]
- minimums = options[:min].scan(IMAGE_SIZE_REGEXP).first.collect{|n| n.to_i} rescue []
- raise ArgumentError, "Invalid value for option :min (should be 'XXxYY')" unless minimums.size == 2
-
- require 'RMagick'
-
- validates_each(attrs, options) do |record, attr, value|
- unless value.blank?
- begin
- img = ::Magick::Image::read(value).first
- record.errors.add('image', "is too small, must be at least #{minimums[0]}x#{minimums[1]}") if ( img.rows < minimums[1] || img.columns < minimums[0] )
- rescue ::Magick::ImageMagickError
- record.errors.add('image', "invalid image")
- end
- img = nil
- GC.start
- end
- end
- end
- end
- end
-end