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# == Schema Information
# Schema version: 114
#
# 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: francis@mysociety.org; WWW: http://www.mysociety.org/
class ProfilePhoto < ActiveRecord::Base
WIDTH = 96
HEIGHT = 96
MAX_DRAFT = 500 # keep even pre-cropped images reasonably small
belongs_to :user
validate :data_and_draft_checks
# deliberately don't strip_attributes, so keeps raw photo properly
attr_accessor :x, :y, :w, :h
attr_accessor :image
after_initialize :convert_data_to_image
# 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
# draft images are before the user has cropped them
if !self.draft && (image.columns != WIDTH || image.rows != HEIGHT)
# do any exact cropping (taken from Jcrop interface)
if self.w && self.h
image.crop!(self.x.to_i, self.y.to_i, self.w.to_i, self.h.to_i)
end
# do any further cropping
image.resize_to_fill!(WIDTH, HEIGHT)
altered = true
end
if self.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, self.image.to_blob)
end
end
private
def data_and_draft_checks
if self.data.nil?
errors.add(:data, N_("Please choose a file containing your photo."))
return
end
if self.image.nil?
errors.add(:data, N_("Couldn't understand the image file that you uploaded. PNG, JPEG, GIF and many other common image file formats are supported."))
return
end
if self.image.format != 'PNG'
errors.add(:data, N_("Failed to convert image to a PNG"))
end
if !self.draft && (self.image.columns != WIDTH || self.image.rows != HEIGHT)
errors.add(:data, N_("Failed to convert image to the correct size: at %{cols}x%{rows}, need %{width}x%{height}" % { :cols => self.image.columns, :rows => self.image.rows, :width => WIDTH, :height => HEIGHT }))
end
if self.draft && self.user_id
raise "Internal error, draft pictures must not have a user"
end
if !self.draft && !self.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
self.image = image_list[0] # XXX perhaps take largest image or somesuch if there were multiple in the file?
self.convert_image
end
end
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