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#############################################################################
#
# Copyright (c) 2011 Nexedi SA and Contributors. All Rights Reserved.
# Rafael Monnerat <rafael@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
##############################################################################
import urllib2
from lxml import etree
from erp5.component.document.Document import ConversionError
SVG_DEFAULT_NAMESPACE = "http://www.w3.org/2000/svg"
def getDataURI(url):
try:
data = urllib2.urlopen(url)
except Exception as e:
raise ConversionError("Error to transform url (%s) into data uri. ERROR = %s" % (url, Exception(e)))
return 'data:%s;base64,%s' % (data.info()["content-type"],
data.read().encode("base64").replace('\n', ""))
def transformUrlToDataURI(content):
if content is None or len(content) == 0:
return content
root = etree.fromstring(content)
# Prevent namespace contains "None" included into svg by mistake
# and fix svg definition as in some images the namespace is not
# well defined by using xmlns="http://www.w3.org/2000/svg" instead
# of xmlns:svg="http://www.w3.org/2000/svg".
namespace_dict = root.nsmap.copy()
discarted = namespace_dict.pop(None, "discard")
if discarted == SVG_DEFAULT_NAMESPACE or \
"svg" not in namespace_dict:
namespace_dict["svg"] = SVG_DEFAULT_NAMESPACE
# Get all images which uses xlink:href
image_list = root.xpath("//svg:image[@xlink:href]", namespaces=namespace_dict)
xlink_href = "{%s}href" % namespace_dict.get("xlink", None)
# Transform all images which uses url, into data URI
for image in image_list:
url_value = image.get(xlink_href)
if url_value.startswith("http"):
image.set(xlink_href, getDataURI(image.get(xlink_href)))
return etree.tostring(
root,
encoding="utf-8",
xml_declaration=True,
standalone="no",
)