139 lines
4.0 KiB
Ruby
139 lines
4.0 KiB
Ruby
# /usr/bin/env ruby
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require 'sinatra'
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require "sinatra/reloader"
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require 'tmpdir'
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set :protection, :except => :frame_options
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set :environment, :production
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set :bind, "::"
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set :port, 4567
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if !File.exist?('config.json') || !File.readable?('config.json')
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raise RuntimeException, 'Could not read config.json'
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end
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PRINTER_DEVICE = '/dev/usb/lp0'
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PRINTER_DPI = 203 # DatamaxONeil E4204B Mark III native head resolution
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PRINTER_DARKNESS = 8 # lower than factory default to stop thermal dot-gain from fusing barcode bars
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TEST_LABEL_PDF = File.join(File.dirname(__FILE__), 'test-label.pdf')
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configure do
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enable :static
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set :session_secret, File.read(File.join(File.dirname(__FILE__), '.session_secret')).strip
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enable :sessions
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set :views, File.join(File.dirname(__FILE__), 'views')
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set :public_folder, File.join(File.dirname(__FILE__), 'public')
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set :files, File.join(settings.public_folder, 'files')
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set :unallowed_paths, ['.', '..']
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end
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configure :production do
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enable :reloader
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end
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helpers do
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def flash(message = '', level)
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case level
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when "success"
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session[:alert_success] = message
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when "danger"
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session[:alert_danger] = message
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when "warning"
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session[:alert_warning] = message
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end
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end
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# Renders a PDF to ZPL ^GFA graphic labels at the printer's native DPI,
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# bypassing CUPS/Gutenprint's raster pipeline which blurs text and 1px-shifts
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# output compared to native ZPL rendering.
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def pdf_to_zpl(pdf_path, dpi: PRINTER_DPI)
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Dir.mktmpdir do |dir|
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pattern = File.join(dir, 'page-%03d.pbm')
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ok = system('gs', '-q', '-dNOPAUSE', '-dBATCH', '-dSAFER',
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'-sDEVICE=pbmraw', "-r#{dpi}",
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'-dTextAlphaBits=4', '-dGraphicsAlphaBits=4',
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"-sOutputFile=#{pattern}", pdf_path)
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raise 'ghostscript rendering failed' unless ok
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Dir.glob(File.join(dir, 'page-*.pbm')).sort.map { |f| pbm_to_zpl_label(f) }.join
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end
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end
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def pbm_to_zpl_label(pbm_path)
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bytes = File.binread(pbm_path)
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header = /\AP4\s+(?:#[^\n]*\n\s*)*(\d+)\s+(\d+)\s/.match(bytes)
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raise "unreadable PBM header in #{pbm_path}" unless header
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width, height = header[1].to_i, header[2].to_i
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bytes_per_row = (width + 7) / 8
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total_bytes = bytes_per_row * height
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body = bytes.byteslice(header.end(0), total_bytes)
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hexdata = body.unpack1('H*').upcase
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"^XA\n^MD#{PRINTER_DARKNESS}\n^PW#{width}\n^LL#{height}\n^FO0,0^GFA,#{total_bytes},#{total_bytes},#{bytes_per_row},#{hexdata}\n^XZ\n"
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end
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end
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before do
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@alert_success = session.delete(:alert_success)
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@alert_danger = session.delete(:alert_danger)
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@alert_warning = session.delete(:alert_warning)
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end
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get '/' do
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erb :index
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end
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get '/upload' do
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erb :upload
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end
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post '/upload' do
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if params[:file]
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tempfile = params[:file][:tempfile]
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filename = params[:file][:filename]
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filetype = File.extname filename
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filepath = File.join(settings.files, filename)
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File.open(filepath, 'wb') do |f|
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f.write tempfile.read
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end
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case filetype
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when ".pdf"
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begin
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zpl = pdf_to_zpl(filepath)
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File.open(PRINTER_DEVICE, 'wb') { |f| f.write(zpl) }
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flash "PDF: Upload successful (#{filename})", "success"
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rescue => e
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flash "PDF: Failed to print (#{e.message})", "danger"
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end
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when ".zpl"
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File.open(PRINTER_DEVICE, 'wb') { |f| f.write(File.binread(filepath)) }
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flash "ZPL: Upload successful (#{filename})", "success"
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else
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flash "#{filetype} is not supported. Only .pdf and .zpl!", "false"
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end
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File.delete(filepath) if File.exist?(filepath)
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else
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flash 'You have to choose a file', "warning"
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end
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redirect '/upload'
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end
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post '/test-print' do
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begin
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zpl = pdf_to_zpl(TEST_LABEL_PDF)
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File.open(PRINTER_DEVICE, 'wb') { |f| f.write(zpl) }
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flash 'Test label sent to printer', 'success'
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rescue => e
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flash "Test print failed (#{e.message})", 'danger'
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end
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redirect '/upload'
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end
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