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# == Schema Information
#
# Table name: profile_photos
#
# id :integer not null, primary key
# data :binary not null
# user_id :integer
# draft :boolean default(FALSE), not null
#
# models/profile_photo.rb:
# Image of user that goes on their profile.
#
# Copyright (c) 2009 UK Citizens Online Democracy. All rights reserved.
# Email: hello@mysociety.org; WWW: http://www.mysociety.org/
class ProfilePhoto < ActiveRecord::Base
# deliberately don't strip_attributes, so keeps raw photo properly
WIDTH = 96
HEIGHT = 96
MAX_DRAFT = 500 # keep even pre-cropped images reasonably small
belongs_to :user
validate :data_and_draft_checks
attr_accessor :x, :y, :w, :h
attr_accessor :image
after_initialize :convert_data_to_image
# make image valid format and size
def convert_image
return if data.nil?
return if image.nil?
# convert to PNG if it isn't, and to right size
altered = false
if image.format != 'PNG'
self.image.format = 'PNG'
altered = true
end
# draft images are before the user has cropped them
if !draft && (image.columns != WIDTH || image.rows != HEIGHT)
# do any exact cropping (taken from Jcrop interface)
if w && h
image.crop!(x.to_i, y.to_i, w.to_i, h.to_i)
end
# do any further cropping
image.resize_to_fill!(WIDTH, HEIGHT)
altered = true
end
if draft && (image.columns > MAX_DRAFT || image.rows > MAX_DRAFT)
image.resize_to_fit!(MAX_DRAFT, MAX_DRAFT)
altered = true
end
if altered
write_attribute(:data, image.to_blob)
end
end
private
def data_and_draft_checks
if data.nil?
errors.add(:data, _("Please choose a file containing your photo."))
return
end
if image.nil?
errors.add(:data, _("Couldn't understand the image file that you uploaded. PNG, JPEG, GIF and many other common image file formats are supported."))
return
end
if image.format != 'PNG'
errors.add(:data, _("Failed to convert image to a PNG"))
end
if !draft && (image.columns != WIDTH || image.rows != HEIGHT)
errors.add(:data, _("Failed to convert image to the correct size: at {{cols}}x{{rows}}, need {{width}}x{{height}}",
:cols => image.columns,
:rows => image.rows,
:width => WIDTH,
:height => HEIGHT))
end
if draft && user_id
raise "Internal error, draft pictures must not have a user"
end
if !draft && !user_id
raise "Internal error, real pictures must have a user"
end
end
# Convert binary data blob into ImageMagick image when assigned
def convert_data_to_image
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
return
end
# TODO: perhaps take largest image or somesuch if there were multiple
# in the file?
self.image = image_list[0]
convert_image
end
end
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