Class: ShortRails::ShortUrlsController

Inherits:
ApplicationController show all
Defined in:
app/controllers/short_rails/short_urls_controller.rb

Instance Method Summary collapse

Instance Method Details

#create ⇒ Object

POST ‘/’ create short URL



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# File 'app/controllers/short_rails/short_urls_controller.rb', line 24

def create
  begin
    short = SecureRandom.base64(6).tr("+/=", "xyz").downcase
  end while ShortUrl.where(:short => short).exists?

  url_params = params.except(:action, :controller, :base_url, :base_url_short_param)
  short_url = ShortUrl.new(:short => short, :url => params[:base_url], :url_short_param => params[:base_url_short_param], :params => url_params)
  if short_url.save
    # return short id
    render :text => short
  else
    head :no_content
  end
end

#parameters ⇒ Object

GET ‘:id/params’ get parameters for full URL



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# File 'app/controllers/short_rails/short_urls_controller.rb', line 41

def parameters
  short_url = ShortUrl.find_by_short(params[:short])

  render :text => short_url.params.to_json
end

#qrcode ⇒ Object

GET ‘:id/qrcode’ get QR code containing this short URL



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# File 'app/controllers/short_rails/short_urls_controller.rb', line 49

def qrcode
  require 'rqrcode_png'

  if ShortUrl.find_by_short(params[:short]).nil?
    render :text => "ERROR: Could not generate QR code", :status => :bad_request
    return
  end

  width = params[:width].to_i
  height = params[:height].to_i
  if width > 2048 || height > 2048
    render :text => "ERROR: Requested image size is too large", :status => :bad_request
    return
  end

  # create QR code with minimal version
  qr = nil
  version = 3
  while qr.nil? && version < 40
    begin
      qr = RQRCode::QRCode.new( short_url_url, :size => version, :level => :h )
    rescue
      # current version has not enough capacity, try next version
      version += 1
    end
  end
  if qr.nil?
    render :text => "ERROR: Could not generate QR code", :status => :bad_request
    return
  end
  qr_image = qr.to_img

  qr_size = 17 + 4 * version
  # default size is QR code pixels with a border of 1/10 that size
  img_size =(qr_size + qr_size/10 * 2)
  # clamp to min default size
  width = [width, img_size].max
  height = [height, img_size].max

  if width > img_size || height > img_size
    # calculate image size to fit scaled QR code to requested size
    size = [width, height].min
    img_size = (size / img_size) * img_size
    qr_image = qr_image.resize(img_size, img_size)

    if width > img_size || height > img_size
      # center QR code in image of requested size
      image = ::ChunkyPNG::Image.new(width, height, ::ChunkyPNG::Color::WHITE)
      offset_x = (width - img_size) / 2
      offset_y = (height - img_size) / 2
      qr_image = image.replace(qr_image, offset_x, offset_y)
    end
  end

  send_data qr_image.to_string, :type => 'image/png', :disposition => 'inline', :filename => "#{params[:short]}.png"
end

#show ⇒ Object

GET ‘:id’ redirect to base URL



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# File 'app/controllers/short_rails/short_urls_controller.rb', line 8

def show
  short_url = ShortUrl.find_by_short(params[:short])

  if short_url.url_short_param.nil?
    # redirect to full URL
    query_params = short_url.params
  else
    # redirect to base URL with short param
    query_params = {short_url.url_short_param => short_url.short}
  end

  redirect_to "#{short_url.url}?#{query_params.to_query}"
end