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bfe_qrcode.py
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Created
Sat, Sep 14, 05:47
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2 KB
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text/x-python
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Mon, Sep 16, 05:47 (2 d)
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blob
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R3600 invenio-infoscience
bfe_qrcode.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 CERN.
##
## Invenio 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.
##
## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""BibFormat element - QR code generator """
from
invenio.config
import
CFG_SITE_SECURE_URL
,
CFG_WEBDIR
,
CFG_SITE_RECORD
from
invenio.hashutils
import
md5
import
os
try
:
import
qrcode
from
PIL
import
Image
HAS_QR
=
True
except
ImportError
:
HAS_QR
=
False
if
not
HAS_QR
:
from
warnings
import
warn
warn
(
"Please install qrcode <https://pypi.python.org/pypi/qrcode> and "
"Python Imaging Library (PIL) "
"<https://pypi.python.org/pypi/Pillow/>."
)
def
_get_record_hash
(
link
):
"""
Generate a record hash including CFG_SITE_URL so that
if CFG_SITE_URL is updated, the QR-code image is invalidated.
"""
return
md5
(
link
)
.
hexdigest
()[:
8
]
.
lower
()
def
format_element
(
bfo
,
width
=
"100"
):
"""
Generate a QR-code image linking to the current record.
@param width: Width of QR-code image.
"""
if
not
HAS_QR
:
return
""
width
=
int
(
width
)
bibrec_id
=
bfo
.
control_field
(
"001"
)
link
=
"
%s
/
%s
/
%s
"
%
(
CFG_SITE_SECURE_URL
,
CFG_SITE_RECORD
,
bibrec_id
)
hash_val
=
_get_record_hash
(
link
)
filename
=
"
%s
_
%s
.png"
%
(
bibrec_id
,
hash_val
)
filename_url
=
"/img/qrcodes/
%s
"
%
filename
filename_path
=
os
.
path
.
join
(
CFG_WEBDIR
,
"img/qrcodes/
%s
"
%
filename
)
if
not
os
.
path
.
exists
(
filename_path
):
if
not
os
.
path
.
exists
(
os
.
path
.
dirname
(
filename_path
)):
os
.
makedirs
(
os
.
path
.
dirname
(
filename_path
))
img
=
qrcode
.
make
(
link
)
img
.
_img
=
img
.
_img
.
convert
(
"RGBA"
)
img
.
_img
=
img
.
_img
.
resize
((
width
,
width
),
Image
.
ANTIALIAS
)
img
.
save
(
filename_path
,
"PNG"
)
return
"""<img src="%s" width="%s" />"""
%
(
filename_url
,
width
)
def
escape_values
(
dummy_bfo
):
"""
Called by BibFormat in order to check if output of this element
should be escaped.
"""
return
0
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