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crossrefutils.py
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R3600 invenio-infoscience
crossrefutils.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2012 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.
""" API to fetch metadata in MARCXML format from crossref site using DOI """
import
urllib2
from
invenio.config
import
CFG_ETCDIR
,
CFG_CROSSREF_USERNAME
,
\
CFG_CROSSREF_PASSWORD
from
invenio.bibconvert_xslt_engine
import
convert
# Exceptions classes
class
CrossrefError
(
Exception
):
"""Crossref errors"""
def
__init__
(
self
,
code
):
"""Initialisation"""
self
.
code
=
code
def
__str__
(
self
):
"""Returns error code"""
return
repr
(
self
.
code
)
def
get_marcxml_for_doi
(
doi
):
"""
Send doi to the http://www.crossref.org/openurl page.
Attaches parameters: username, password, doi and noredirect.
Returns the MARCXML code or throws an exception, when
1. DOI is malformed
2. Record not found
"""
if
not
CFG_CROSSREF_USERNAME
and
not
CFG_CROSSREF_PASSWORD
:
raise
CrossrefError
(
"error_crossref_no_account"
)
# Clean the DOI
doi
=
doi
.
strip
()
# Getting the data from external source
url
=
"http://www.crossref.org/openurl/?pid="
+
CFG_CROSSREF_USERNAME
\
+
":"
+
CFG_CROSSREF_PASSWORD
+
"&noredirect=tru&id=doi:"
+
doi
request
=
urllib2
.
Request
(
url
)
response
=
urllib2
.
urlopen
(
request
)
header
=
response
.
info
()
.
getheader
(
'Content-Type'
)
content
=
response
.
read
()
# Check if the returned page is html - this means the DOI is malformed
if
"text/html"
in
header
:
raise
CrossrefError
(
"error_crossref_malformed_doi"
)
if
'status="unresolved"'
in
content
:
raise
CrossrefError
(
"error_crossref_record_not_found"
)
# Convert xml to marc using convert function
# from bibconvert_xslt_engine file
# Seting the path to xsl template
xsl_crossref2marc_config
=
"
%s
/bibconvert/config/
%s
"
%
\
(
CFG_ETCDIR
,
"crossref2marcxml.xsl"
)
output
=
convert
(
xmltext
=
content
,
\
template_filename
=
xsl_crossref2marc_config
)
return
output
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