corporation.rb

# A corporation in EVE.
class Corporation < ActiveRecord::Base
  has_many :characters
  has_many :stations
  has_many :kills
  has_many :kill_attackers
  has_many :fittings
  has_many :reimbursement_requests
  has_one :ceo, :class_name => "Character", :foreign_key => "ceo_id"
  belongs_to :alliance

  # Returns the corporate logo for this corporation, either by displaying a locally stored file or returning a reference to the logo on clg.eve-metrics.com and enqueuing a job to store it locally asynchronously
  def logo(size)
    if File.exists? "#{RAILS_ROOT}/public/system/corporations/#{self.id}_#{size}.png"
      return "/system/corporations/#{self.id}_#{size}.png"
    else
      Delayed::Job.enqueue GetCorporationLogoJob.new(self.id)
      return "/images/no_logo_#{size}.png"
    end
  end
end

get_corporation_logo_job.rb

require 'net/http'
require 'RMagick'
class GetCorporationLogoJob < Struct.new(:corporation_id)
  def perform
    File.open("#{RAILS_ROOT}/public/system/corporations/#{corporation_id.to_i}_64.png","wb") do |f|
      Net::HTTP.start("clg.eve-metrics.com") do |http| 
        resp = http.get("/#{corporation_id.to_i.to_s}.png")
        return unless resp
        if resp.response['Location'] then
          unless resp.response['Location'].include?"not_in_alliance.png"
            url = URI.parse(resp.response['Location'])
            res2 = Net::HTTP.start(url.host, url.port) {|http2|
              f << http2.get(url.path).body
            }
          end
        end
      end
    end
    # Now use RMagick to bake some 16/32 images.
    if File.exists?("#{RAILS_ROOT}/public/system/corporations/#{corporation_id.to_i}_64.png")
      Magick::Image::read("#{RAILS_ROOT}/public/system/corporations/#{corporation_id.to_i}_64.png")[0].scale(16,16).write("#{RAILS_ROOT}/public/system/corporations/#{corporation_id.to_i}_16.png")
      Magick::Image::read("#{RAILS_ROOT}/public/system/corporations/#{corporation_id.to_i}_64.png")[0].scale(32,32).write("#{RAILS_ROOT}/public/system/corporations/#{corporation_id.to_i}_32.png")
    end
  end
  def errors
  end
end