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crossref.py
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Fri, Nov 15, 07:23

crossref.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.legacy.bibconvert.registry import templates
from invenio.legacy.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 = templates.get('crossref2marcxml.xsl', '')
output = convert(xmltext=content, \
template_filename=xsl_crossref2marc_config)
return output

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