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# models/profile_photo.rb:
# Image of user that goes on their profile.
#
# Copyright (c) 2009 UK Citizens Online Democracy. All rights reserved.
# Email: francis@mysociety.org; WWW: http://www.mysociety.org/
#
# $Id: profile_photo.rb,v 1.1 2009-08-05 16:31:11 francis Exp $
#
require 'mahoro'
require 'RMagick'
class ProfilePhoto < ActiveRecord::Base
WIDTH = 96
HEIGHT = 96
has_one :user
validates_presence_of :user
# deliberately don't strip_attributes, so keeps raw photo properly
# convert binary data blob into ImageMagick image when assigned
attr_accessor :image
def data=(data)
write_attribute(:data, data)
if data.nil?
self.image = nil
return
end
image_list = Magick::ImageList.new
begin
image_list.from_blob(data)
rescue Magick::ImageMagickError
self.image = nil
write_attribute(:data, nil)
return
end
self.image = image_list[0] # XXX perhaps take largest image or somesuch if there were multiple in the file?
self.convert_image
end
# make image valid format and size
def convert_image
if self.data.nil?
return
end
if self.image.nil?
return
end
# convert to PNG if it isn't, and to right size
altered = false
if self.image.format != 'PNG'
self.image.format = 'PNG'
altered = true
end
if image.columns != WIDTH || image.rows != HEIGHT
image.resize_to_fill!(WIDTH, HEIGHT)
altered = true
end
if altered
write_attribute(:data, self.image.to_blob)
end
end
def validate
if self.data.nil?
errors.add(:data, "^No image specified")
return
end
if self.image.nil?
errors.add(:data, "^Couldn't read the image that you uploaded, please try again.")
return
end
if self.image.format != 'PNG'
errors.add(:data, "^Failed to convert image to a PNG")
end
if self.image.columns != WIDTH || self.image.rows != HEIGHT
errors.add(:data, "^Failed to convert image to the correct size: at #{self.image.columns}x#{self.image.rows}, need #{WIDTH}x#{HEIGHT}")
end
end
end
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