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oai_repository_webinterface.py
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Sat, May 11, 07:05

oai_repository_webinterface.py
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## $Id$
##
## This file is part of CDS Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006 CERN.
##
## CDS 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.
##
## CDS 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 CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""CDS Invenio OAI provider interface, compliant with OAI-PMH/2.0"""
__lastupdated__ = """$Date$"""
__version__ = "$Id$"
import os
import sys
import urllib
import time
from mod_python import apache
from invenio.dbquery import run_sql
from invenio.oai_repository_config import *
from invenio import oai_repository
from invenio.config import cachedir
from invenio.webinterface_handler import wash_urlargd, WebInterfaceDirectory
class WebInterfaceOAIProviderPages(WebInterfaceDirectory):
"""Defines the set of /oai2d OAI provider pages."""
_exports = ['']
def __call__(self, req, form):
"OAI repository interface"
argd = wash_urlargd(form, {'verb': (str, ""),
'metadataPrefix': (str, ""),
'from': (str, ""),
'until': (str, ""),
'set': (str, ""),
'identifier': (str, ""),
'resumptionToken': (str, ""),
})
## oai_repository business logic does not like to see the
## language parameter, so take it out now:
if argd['ln']:
del argd['ln']
## construct args (argd string equivalent) for the
## oai_repository business logic (later it may be good if it
## takes argd directly):
args = urllib.urlencode(argd)
## check availability
if os.path.exists("%s/RTdata/RTdata" % cachedir):
time_gap = int(time.time() - os.path.getmtime("%s/RTdata/RTdata" % cachedir))
if(time_gap < oai_sleep):
req.err_headers_out["Status-Code"] = "503"
req.err_headers_out["Retry-After"] = "%d" % (oai_sleep - time_gap)
req.status = apache.HTTP_SERVICE_UNAVAILABLE
return "Retry after %d seconds" % (oai_sleep - time_gap)
command = "touch %s/RTdata/RTdata" % cachedir
os.system(command)
## check request for OAI compliancy
oai_error = oai_repository.check_args(argd)
## create OAI response
req.content_type = "text/xml"
req.send_http_header()
if oai_error == "":
## OAI Identify
if argd['verb'] == "Identify":
req.write(oai_repository.oaiidentify(args))
## OAI ListSets
elif argd['verb'] == "ListSets":
req.write(oai_repository.oailistsets(args))
## OAI ListIdentifiers
elif argd['verb'] == "ListIdentifiers":
req.write(oai_repository.oailistidentifiers(args))
## OAI ListRecords
elif argd['verb'] == "ListRecords":
req.write(oai_repository.oailistrecords(args))
## OAI GetRecord
elif argd['verb'] == "GetRecord":
req.write(oai_repository.oaigetrecord(args))
## OAI ListMetadataFormats
elif argd['verb'] == "ListMetadataFormats":
req.write(oai_repository.oailistmetadataformats(args))
## Unknown verb
else:
req.write(oai_repository.oai_error("badVerb","Illegal OAI verb"))
## OAI error
else:
req.write(oai_repository.oai_header(args,""))
req.write(oai_error)
req.write(oai_repository.oai_footer(""))
return "\n"
## Return the same page wether we ask for /oai2d?verb or /oai2d/?verb
index = __call__

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