73 lines
1.7 KiB
Python
73 lines
1.7 KiB
Python
#!/usr/bin/env python
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# -*- mode: python; indent-tabs-mode: nil; -*- coding: utf-8 -*-
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"""
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QRCodePage.py
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Copyright 2014 by Marcello Perathoner
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Distributable under the GNU General Public License Version 3 or newer.
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A page to generate QR-codes.
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"""
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from __future__ import unicode_literals
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import six
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from six.moves import urllib
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import cherrypy
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import qrcode
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class QRCodePage (object):
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""" Serve a QR-code as PNG image. """
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def index (self, **kwargs):
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""" Output QR-Code.
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Parameters are:
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data: the data to encode (url quoted)
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ec_level: error correction level. One of: L M Q H
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version: QR code version
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box_size: size of one QR code box in pixel
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border: width of border in boxes (should be at least 4)
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"""
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qr = qrcode.QRCode (
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error_correction = self._get_ecl (kwargs),
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version = kwargs.get ('version', None),
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box_size = kwargs.get ('box_size', 10),
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border = kwargs.get ('border', 4),
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)
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qr.add_data (urllib.parse.unquote (kwargs['data']))
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qr.make (fit = True)
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img = qr.make_image ()
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cherrypy.response.headers['Content-Type'] = 'image/png'
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buf = six.BytesIO ()
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img._img.save (buf, 'PNG')
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return buf.getvalue ()
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@staticmethod
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def _get_ecl (kwargs):
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""" Get and decode error correction paramter. """
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ecl = {
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'L': 1,
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'M': 0,
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'Q': 3,
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'H': 2,
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}
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if 'ec_level' in kwargs and kwargs['ec_level'] in ecl:
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return ecl[kwargs['ec_level']]
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return ecl['M']
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