97 lines
2.7 KiB
Ruby
97 lines
2.7 KiB
Ruby
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require 'mini_magick'
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class Image < ActiveRecord::Base
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attr_accessor :file
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belongs_to :people
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validates_presence_of :people_id
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before_validation_on_create :set_people_id
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before_create :validate_image_sanity
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after_create :setup_directories
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before_destroy :destroy_directories
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has_many :tag_images, :dependent => :destroy
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has_many :tagged_items, :through => :tag_images
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##
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# Builds the filename for this model for a particular version of the file.
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#
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def filename_for_version(ver = :screen)
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if respond_to?(ver)
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"community/#{id}/#{self.send(ver)}"
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else
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"/images/image-missing.png"
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end
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end
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protected
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##
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# Determines the base directory for all files in this model.
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#
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def base_directory
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"#{RAILS_ROOT}/public/images/community/#{id}"
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end
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##
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# Sets the People marker for ownership on creation.
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#
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def set_people_id
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self[:people_id] = ApplicationController.current_people_id rescue nil
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self[:people_id] ||= People.penguincoder.id rescue nil
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end
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##
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# Checks to make sure that the file exists and is an image.
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#
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def validate_image_sanity
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if @file.nil? or @file.to_s.empty?
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errors.add(:file, 'is not a file')
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return false
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end
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errors.add(:file, 'is too big (3MB max)') if @file.size > 3 * 1048576
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begin
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@magick_image = MiniMagick::Image.from_blob(@file.read,
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File.extname(@file.original_filename))
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rescue
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logger.debug("Caught an exception saving an image:")
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logger.debug("* #{$!}")
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errors.add(:file, 'is not an image')
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end
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return false if self.errors.size > 0
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self.content_type = @file.content_type.chomp
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true
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end
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##
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# Makes the directories and writes the different versions for the uploaded
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# files if applicable.
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#
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def setup_directories
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Dir.mkdir(base_directory) unless File.exist?(base_directory)
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self.original = File.basename(@file.original_filename).gsub(/[^\w._-]/, '')
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@magick_image.write("#{base_directory}/#{self.original}")
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@magick_image.thumbnail("600x600>")
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self.screen = "screen_#{self.original}"
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@magick_image.write("#{base_directory}/#{self.screen}")
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if @magick_image.output =~ / (\d+)x(\d+) /
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self.screen_width = $1
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self.screen_height = $2
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end
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@magick_image.thumbnail("50x50>")
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self.thumbnail = "thumbnail_#{self.original}"
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@magick_image.write("#{base_directory}/#{self.thumbnail}")
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self.save
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end
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##
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# Removes the directories and files associated with this model on destroy.
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#
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def destroy_directories
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return unless File.exists?(base_directory)
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Dir.foreach(base_directory) do |file|
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next if file =~ /^\.\.?$/
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File.delete(base_directory + '/' + file)
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end
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Dir.delete(base_directory)
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end
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end
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