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R3600/modules/bibharvest/lib/oai_repository.py
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oai_repository.py
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## $Id$
## OAI interface for CDSware/MySQL written in Python compliant with OAI-PMH2.0
## This file is part of the CERN Document Server Software (CDSware).
## Copyright (C) 2002, 2003, 2004, 2005 CERN.
##
## The CDSware 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.
##
## The CDSware 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 CDSware; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""OAI interface for CDSware/MySQL written in Python compliant with OAI-PMH2.0"""
import cPickle
import string
from string import split
import os
import re
import urllib
import sys
import time
import md5
from cdsware.oai_repository_config import *
from cdsware.config import *
from cdsware.dbquery import run_sql
verbs = {
"Identify" : [""],
"ListSets" : ["resumptionToken"],
"ListMetadataFormats" : ["resumptionToken"],
"ListRecords" : ["resumptionToken"],
"ListIdentifiers" : ["resumptionToken"],
"GetRecord" : [""]
}
params = {
"verb" : ["Identify","ListIdentifiers","ListSets","ListMetadataFormats","ListRecords","GetRecord"],
"metadataPrefix" : ["","oai_dc","marcxml"],
"from" :[""],
"until":[""],
"set" :[""],
"identifier": [""]
}
def encode_for_xml(strxml):
"Encode special chars in string for XML-compliancy."
if strxml == None:
return strxml
else:
strxml = string.replace(strxml, '&', '&')
strxml = string.replace(strxml, '<', '&lt;')
return strxml
def escape_space(strxml):
"Encode special chars in string for URL-compliancy."
strxml = string.replace(strxml, ' ', '%20')
return strxml
def encode_for_url(strxml):
"Encode special chars in string for URL-compliancy."
strxml = string.replace(strxml, '%', '%25')
strxml = string.replace(strxml, ' ', '%20')
strxml = string.replace(strxml, '?', '%3F')
strxml = string.replace(strxml, '#', '%23')
strxml = string.replace(strxml, '=', '%3D')
strxml = string.replace(strxml, '&', '%26')
strxml = string.replace(strxml, '/', '%2F')
strxml = string.replace(strxml, ':', '%3A')
strxml = string.replace(strxml, ';', '%3B')
strxml = string.replace(strxml, '+', '%2B')
return strxml
def oai_header(args, verb):
"Print OAI header"
out = ""
out = out + "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + "\n"
out = out + "<OAI-PMH xmlns=\"http://www.openarchives.org/OAI/2.0/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd\">\n"
out = out + " <responseDate>" + oaigetresponsedate() + "</responseDate>\n"
if verb:
out = out + " <request verb=\"%s\">%s</request>\n" % (verb, oaigetrequesturl(args))
out = out + " <%s>\n" % verb
else:
out = out + " <request>%s</request>\n" % (oaigetrequesturl(args))
return out
def oai_footer(verb):
"Print OAI footer"
out = ""
if verb:
out = "%s </%s>\n" % (out, verb)
out = out + "</OAI-PMH>\n"
return out
def oai_error_header(args, verb):
"Print OAI header"
out = ""
### out = "Content-Type: text/xml\n\n"
out = out + "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + "\n"
out = out + "<OAI-PMH xmlns=\"http://www.openarchives.org/OAI/2.0/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd\">\n"
out = out + " <responseDate>" + oaigetresponsedate() + "</responseDate>\n"
out = out + " <request verb=\"%s\">%s</request>\n" % (verb, oaigetrequesturl(args))
return out
def oai_error_footer(verb):
"Print OAI footer"
out = verb
out = "</OAI-PMH>\n"
return out
def get_field(sysno, field):
"Gets list of field 'field' for the record with 'sysno' system number."
out = []
digit = field[0:2]
bibbx = "bib%sx" % digit
bibx = "bibrec_bib%sx" % digit
query = "SELECT bx.value FROM %s AS bx, %s AS bibx WHERE bibx.id_bibrec='%s' AND bx.id=bibx.id_bibxxx AND bx.tag='%s'" % (bibbx, bibx, sysno, field)
res = run_sql(query)
for row in res:
out.append(row[0])
return out
def utc_to_localtime(date):
"Convert UTC to localtime"
ldate = date.split("T")[0]
ltime = date.split("T")[1]
lhour = ltime.split(":")[0]
lminute = ltime.split(":")[1]
lsec = ltime.split(":")[2]
lyear = ldate.split("-")[0]
lmonth = ldate.split("-")[1]
lday = ldate.split("-")[2]
timetoconvert = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.mktime((string.atoi(lyear), string.atoi(lmonth), string.atoi(lday), string.atoi(lhour), string.atoi(lminute), string.atoi(lsec[:-1]), 0, 0, -1)) - time.timezone + (time.daylight)*3600))
return timetoconvert
def localtime_to_utc(date):
"Convert localtime to UTC"
ldate = date.split(" ")[0]
ltime = date.split(" ")[1]
lhour = ltime.split(":")[0]
lminute = ltime.split(":")[1]
lsec = ltime.split(":")[2]
lyear = ldate.split("-")[0]
lmonth = ldate.split("-")[1]
lday = ldate.split("-")[2]
timetoconvert = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime(time.mktime((string.atoi(lyear), string.atoi(lmonth), string.atoi(lday), string.atoi(lhour), string.atoi(lminute), string.atoi(lsec), 0, 0, -1))))
return timetoconvert
def get_creation_date(sysno):
"Returns the creation date of the record 'sysno'."
out = ""
res = run_sql("SELECT DATE_FORMAT(creation_date, '%%Y-%%m-%%d %%H:%%i:%%s') FROM bibrec WHERE id=%s", (sysno,), 1)
if res[0][0]:
out = localtime_to_utc(res[0][0])
return out
def get_modification_date(sysno):
"Returns the date of last modification for the record 'sysno'."
out = ""
res = run_sql("SELECT DATE_FORMAT(modification_date,'%%Y-%%m-%%d %%H:%%i:%%s') FROM bibrec WHERE id=%s", (sysno,), 1)
if res[0][0]:
out = localtime_to_utc(res[0][0])
return out
def get_earliest_datestamp():
"Get earliest datestamp in the database"
out = ""
res = run_sql("SELECT MIN(DATE_FORMAT(creation_date,'%%Y-%%m-%%d %%H:%%i:%%s')) FROM bibrec", (), 1)
if res[0][0]:
out = localtime_to_utc(res[0][0])
return out
def check_date(date, dtime="T00:00:00Z"):
"Check if the date has a correct format"
if(re.sub("[0123456789\-:TZ]", "", date) == ""):
if len(date) == 10:
date = date + dtime
if len(date) == 20:
date = utc_to_localtime(date)
else:
date = ""
else:
date = ""
return date
def record_exists(sysno):
"Returns 1 if record with SYSNO 'sysno' exists. Returns 0 otherwise."
out = 0
query = "SELECT id FROM bibrec WHERE id='%s'" % (sysno)
res = run_sql(query)
for row in res:
if row[0] != "":
out = 1
return out
def print_record(sysno, format='marcxml'):
"Prints record 'sysno' formatted accoding to 'format'."
out = ""
# sanity check:
if not record_exists(sysno):
return
if (format == "dc") or (format == "oai_dc"):
format = "xd"
# print record opening tags:
out = out + " <record>\n"
if is_deleted(sysno) and oaideleted != "no":
out = out + " <header status=\"deleted\">\n"
else:
out = out + " <header>\n"
for ident in get_field(sysno, oaiidfield):
out = "%s <identifier>%s</identifier>\n" % (out, escape_space(ident))
out = "%s <datestamp>%s</datestamp>\n" % (out, get_modification_date(sysno))
for set in get_field(sysno, oaisetfield):
out = "%s <setSpec>%s</setSpec>\n" % (out, set)
out = out + " </header>\n"
if is_deleted(sysno) and oaideleted != "no":
pass
else:
out = out + " <metadata>\n"
if format == "marcxml":
out = out + " <marc:record xmlns:marc=\"http://www.loc.gov/MARC21/slim\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.loc.gov/MARC21/slim http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd\" type=\"Bibliographic\">"
out = out + " <marc:leader>00000coc 2200000uu 4500</marc:leader>"
## MARC21 and XML formats, possibley OAI -- they are not in "bibfmt" table; so fetch all the data from "bibXXx" tables:
if format == "marcxml":
out = "%s <marc:controlfield tag=\"001\">%d</marc:controlfield>\n" % (out, int(sysno))
for digit1 in range(0, 10):
for digit2 in range(0, 10):
bibbx = "bib%d%dx" % (digit1, digit2)
bibx = "bibrec_bib%d%dx" % (digit1, digit2)
query = "SELECT b.tag,b.value,bb.field_number FROM %s AS b, %s AS bb "\
"WHERE bb.id_bibrec='%s' AND b.id=bb.id_bibxxx AND b.tag LIKE '%s%%' "\
"ORDER BY bb.field_number, b.tag ASC" % (bibbx, bibx, sysno, str(digit1)+str(digit2))
res = run_sql(query)
field_number_old = -999
field_old = ""
for row in res:
field, value, field_number = row[0], row[1], row[2]
ind1, ind2 = field[3], field[4]
if ind1 == "_":
ind1 = " "
if ind2 == "_":
ind2 = " "
# print field tag
if field_number != field_number_old or field[:-1] != field_old[:-1]:
if format == "marcxml":
if field_number_old != -999:
if field_old[0:2] == "00":
out = out + " </marc:controlfield>\n"
else:
out = out + " </marc:datafield>\n"
if field[0:2] == "00":
out = "%s <marc:controlfield tag=\"%s\">\n" % (out, encode_for_xml(field[0:3]))
else:
out = "%s <marc:datafield tag=\"%s\" ind1=\"%s\" ind2=\"%s\">\n" % (out, encode_for_xml(field[0:3]), encode_for_xml(ind1).lower(), encode_for_xml(ind2).lower())
field_number_old = field_number
field_old = field
# print subfield value
if format == "marcxml":
value = encode_for_xml(value)
if(field[0:2] == "00"):
out = "%s %s\n" % (out, value)
else:
out = "%s <marc:subfield code=\"%s\">%s</marc:subfield>\n" % (out, encode_for_xml(field[-1:]), value)
# fetch next subfield
# all fields/subfields printed in this run, so close the tag:
if (format == "marcxml") and field_number_old != -999:
if field_old[0:2] == "00":
out = out + " </marc:controlfield>\n"
else:
out = out + " </marc:datafield>\n"
out = out + " </marc:record>\n"
elif format == "xd":
# XML Dublin Core format, possibly OAI -- select only some bibXXx fields:
out = out + " <oaidc:dc xmlns:dc=\"http://purl.org/dc/elements/1.1/\" xmlns:oaidc=\"http://www.openarchives.org/OAI/2.0/oai_dc/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd\">\n"
for field_ in get_field(sysno, "041__a"):
out = "%s <dc:language>%s</dc:language>\n" % (out, field_)
for field_ in get_field(sysno, "100__a"):
out = "%s <dc:creator>%s</dc:creator>\n" % (out, encode_for_xml(field_))
for field_ in get_field(sysno, "700__a"):
out = "%s <dc:creator>%s</dc:creator>\n" % (out, encode_for_xml(field_))
for field_ in get_field(sysno, "245__a"):
out = "%s <dc:title>%s</dc:title>\n" % (out, encode_for_xml(field_))
for field_ in get_field(sysno, "111__a"):
out = "%s <dc:title>%s</dc:title>\n" % (out, encode_for_xml(field_))
for field_ in get_field(sysno, "65017a"):
out = "%s <dc:subject>%s</dc:subject>\n" % (out, encode_for_xml(field_))
for field_ in get_field(sysno, "8564_u"):
out = "%s <dc:identifier>%s</dc:identifier>\n" % (out, encode_for_xml(escape_space(field_)))
for field_ in get_field(sysno, "520__a"):
out = "%s <dc:description>%s</dc:description>\n" % (out, encode_for_xml(field_))
date = get_creation_date(sysno)
out = "%s <dc:date>%s</dc:date>\n" % (out, date)
out = out + " </oaidc:dc>\n"
# print record closing tags:
out = out + " </metadata>\n"
out = out + " </record>\n"
return out
def oailistmetadataformats(args):
"Generates response to oailistmetadataformats verb."
arg = parse_args(args)
out = ""
flag = 1 # list or not depending on identifier
if arg['identifier'] != "":
flag = 0
sysno = oaigetsysno(arg['identifier'])
if record_exists(sysno):
flag = 1
else:
out = out + oai_error("idDoesNotExist","invalid record Identifier")
out = oai_error_header(args, "ListMetadataFormats") + out + oai_error_footer("ListMetadataFormats")
return out
if flag:
out = out + " <metadataFormat>\n"
out = out + " <metadataPrefix>oai_dc</metadataPrefix>\n"
out = out + " <schema>http://www.openarchives.org/OAI/1.1/dc.xsd</schema>\n"
out = out + " <metadataNamespace>http://purl.org/dc/elements/1.1/</metadataNamespace>\n"
out = out + " </metadataFormat>\n"
out = out + " <metadataFormat>\n"
out = out + " <metadataPrefix>marcxml</metadataPrefix>\n"
out = out + " <schema>http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd</schema>\n"
out = out + " <metadataNamespace>http://www.loc.gov/MARC21/slim</metadataNamespace>\n"
out = out + " </metadataFormat>\n"
out = oai_header(args, "ListMetadataFormats") + out + oai_footer("ListMetadataFormats")
return out
def oailistrecords(args):
"Generates response to oailistrecords verb."
arg = parse_args(args)
out = ""
sysnos = []
sysno = []
# check if the resumptionToken did not expire
if arg['resumptionToken']:
filename = "%s/RTdata/%s" % (cachedir, arg['resumptionToken'])
if os.path.exists(filename) == 0:
out = oai_error("badResumptionToken", "ResumptionToken expired")
out = oai_error_header(args, "ListRecords") + out + oai_error_footer("ListRecords")
return out
if arg['resumptionToken'] != "":
sysnos = oaicacheout(arg['resumptionToken'])
arg['metadataPrefix'] = sysnos.pop()
else:
sysnos = oaigetsysnolist(arg['set'], arg['from'], arg['until'])
if len(sysnos) == 0: # noRecordsMatch error
out = out + oai_error("noRecordsMatch", "no records correspond to the request")
out = oai_error_header(args, "ListRecords") + out + oai_error_footer("ListRecords")
return out
i = 0
for sysno_ in sysnos:
if sysno_:
i = i + 1
if i > nb_records_in_resume: # cache or write?
if i == nb_records_in_resume + 1: # resumptionToken?
arg['resumptionToken'] = oaigenresumptionToken()
extdate = oaigetresponsedate(oai_rt_expire)
if extdate:
out = "%s <resumptionToken expirationDate=\"%s\">%s</resumptionToken>\n" % (out, extdate, arg['resumptionToken'])
else:
out = "%s <resumptionToken>%s</resumptionToken>\n" % (out, arg['resumptionToken'])
sysno.append(sysno_)
else:
out = out + print_record(sysno_, arg['metadataPrefix'])
if i > nb_records_in_resume:
oaicacheclean()
sysno.append(arg['metadataPrefix'])
oaicachein(arg['resumptionToken'], sysno)
out = oai_header(args, "ListRecords") + out + oai_footer("ListRecords")
return out
def oailistsets(args):
"Lists available sets for OAI metadata harvesting."
out = ""
# note: no flow control in ListSets
sets = get_sets()
for set_ in sets:
out = out + " <set>\n"
out = "%s <setSpec>%s</setSpec>\n" % (out, set_[0])
out = "%s <setName>%s</setName>\n" % (out, set_[1])
if set_[2]:
out = "%s <setDescription>%s</setDescription>\n" % (out, set_[2])
out = out + " </set>\n"
out = oai_header(args, "ListSets") + out + oai_footer("ListSets")
return out
def oaigetrecord(args):
"""Returns record 'identifier' according to 'metadataPrefix' format for OAI metadata harvesting."""
arg = parse_args(args)
out = ""
sysno = oaigetsysno(arg['identifier'])
if record_exists(sysno):
datestamp = get_modification_date(sysno)
out = out + print_record(sysno, arg['metadataPrefix'])
else:
out = out + oai_error("idDoesNotExist", "invalid record Identifier")
out = oai_error_header(args, "GetRecord") + out + oai_error_footer("GetRecord")
return out
out = oai_header(args, "GetRecord") + out + oai_footer("GetRecord")
return out
def oailistidentifiers(args):
"Prints OAI response to the ListIdentifiers verb."
arg = parse_args(args)
out = ""
sysno = []
sysnos = []
if arg['resumptionToken']:
filename = "%s/RTdata/%s" % (cachedir, arg['resumptionToken'])
if os.path.exists(filename) == 0:
out = out + oai_error("badResumptionToken", "ResumptionToken expired")
out = oai_error_header(args, "ListIdentifiers") + out + oai_error_footer("ListIdentifiers")
return out
if arg['resumptionToken']:
sysnos = oaicacheout(arg['resumptionToken'])
else:
sysnos = oaigetsysnolist(arg['set'], arg['from'], arg['until'])
if len(sysnos) == 0: # noRecordsMatch error
out = out + oai_error("noRecordsMatch", "no records correspond to the request")
out = oai_error_header(args, "ListIdentifiers") + out + oai_error_footer("ListIdentifiers")
return out
i = 0
for sysno_ in sysnos:
if sysno_:
i = i + 1
if i > nb_identifiers_in_resume: # cache or write?
if i == nb_identifiers_in_resume + 1: # resumptionToken?
arg['resumptionToken'] = oaigenresumptionToken()
extdate = oaigetresponsedate(oai_rt_expire)
if extdate:
out = "%s <resumptionToken expirationDate=\"%s\">%s</resumptionToken>\n" % (out, extdate, arg['resumptionToken'])
else:
out = "%s <resumptionToken>%s</resumptionToken>\n" % (out, arg['resumptionToken'])
sysno.append(sysno_)
else:
for ident in get_field(sysno_, oaiidfield):
if is_deleted(sysno_) and oaideleted != "no":
out = out + " <header status=\"deleted\">\n"
else:
out = out + " <header>\n"
out = "%s <identifier>%s</identifier>\n" % (out, escape_space(ident))
out = "%s <datestamp>%s</datestamp>\n" % (out, get_modification_date(oaigetsysno(ident)))
for set in get_field(sysno_, oaisetfield):
out = "%s <setSpec>%s</setSpec>\n" % (out, set)
out = out + " </header>\n"
if i > nb_identifiers_in_resume:
oaicacheclean() # clean cache from expired resumptionTokens
oaicachein(arg['resumptionToken'], sysno)
out = oai_header(args, "ListIdentifiers") + out + oai_footer("ListIdentifiers")
return out
def oaiidentify(args):
"Generates response to oaiidentify verb."
out = ""
repositoryname = " <repositoryName>" + cdsname + "</repositoryName>\n"
baseurl = " <baseURL>%s/oai2d.py/</baseURL>\n" % weburl
protocolversion = " <protocolVersion>2.0</protocolVersion>\n"
adminemail = " <adminEmail>%s</adminEmail>\n" % supportemail
earliestdst = " <earliestDatestamp>%s</earliestDatestamp>\n" % get_earliest_datestamp()
deletedrecord = " <deletedRecord>%s</deletedRecord>\n" % oaideleted
repositoryidentifier = "%s" % oaiidprefix
sampleidentifier = oaisampleidentifier
identifydescription = oaiidentifydescription + "\n"
out = out + repositoryname
out = out + baseurl
out = out + protocolversion
out = out + adminemail
out = out + earliestdst
out = out + deletedrecord
out = out + " <granularity>YYYY-MM-DDThh:mm:ssZ</granularity>\n"
# print " <compression></compression>\n"
out = out + oaiidentifydescription
out = oai_header(args, "Identify") + out + oai_footer("Identify")
return out
def oaigetrequesturl(args):
"Generates requesturl tag for OAI."
# re_amp = re.compile('&')
requesturl = weburl + "/" + "oai2d.py/"# + "?" + re_amp.sub("&amp;", args)
return requesturl
def oaigetresponsedate(delay=0):
"Generates responseDate tag for OAI."
return time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime(time.time() + delay))
def oai_error(code, msg):
"OAI error occured"
return "<error code=\"%s\">%s</error>\n" % (code, msg)
def oaigetsysno(identifier):
"Returns the first MySQL BIB ID for the OAI identifier 'identifier', if it exists."
sysno = None
if identifier:
query = "SELECT DISTINCT(bb.id_bibrec) FROM bib%sx AS bx, bibrec_bib%sx AS bb WHERE bx.tag='%s' AND bb.id_bibxxx=bx.id AND bx.value='%s'" % (oaiidfield[0:2], oaiidfield[0:2], oaiidfield, identifier)
res = run_sql(query)
for row in res:
sysno = row[0]
return sysno
def oaigetsysnolist(set, fromdate, untildate):
"Returns list of system numbers for the OAI set 'set', modified from 'date_from' until 'date_until'."
out_dict = {} # dict to hold list of out sysnos as its keys
if set:
query = "SELECT DISTINCT bibx.id_bibrec FROM bib%sx AS bx LEFT JOIN bibrec_bib%sx AS bibx ON bx.id=bibx.id_bibxxx LEFT JOIN bibrec AS b ON b.id=bibx.id_bibrec WHERE bx.tag='%s' AND bx.value='%s'" % (oaiidfield[0:2], oaiidfield[0:2], oaisetfield, set)
else:
query = "SELECT DISTINCT bibx.id_bibrec FROM bib%sx AS bx LEFT JOIN bibrec_bib%sx AS bibx ON bx.id=bibx.id_bibxxx LEFT JOIN bibrec AS b ON b.id=bibx.id_bibrec WHERE bx.tag='%s'" % (oaiidfield[0:2], oaiidfield[0:2], oaiidfield)
if untildate:
query = query + " AND b.modification_date <= '%s'" % untildate
if fromdate:
query = query + " AND b.modification_date >= '%s'" % fromdate
res = run_sql(query)
for row in res:
out_dict[row[0]] = 1
return out_dict.keys()
def is_deleted(recid):
"Check if record with recid has been deleted. Return 1 if deleted."
query = "select a.id from bibrec as a left join bibrec_bib98x as b on a.id=b.id_bibrec left join bib98x as c on b.id_bibxxx=c.id where c.value='DELETED' and a.id=%s" % recid
res = run_sql(query)
for item in res:
if item == None:
return 0
else:
return 1
def oaigenresumptionToken():
"Generates unique ID for resumption token management."
return md5.new(str(time.time())).hexdigest()
def oaicachein(resumptionToken, sysnos):
"Stores or adds sysnos in cache. Input is a string of sysnos separated by commas."
filename = "%s/RTdata/%s" % (cachedir, resumptionToken)
fil = open(filename, "w")
cPickle.dump(sysnos, fil)
fil.close()
return 1
def oaicacheout(resumptionToken):
"Restores string of comma-separated system numbers from cache."
sysnos = []
filename = "%s/RTdata/%s" % (cachedir, resumptionToken)
if oaicachestatus(resumptionToken):
fil = open(filename, "r")
sysnos = cPickle.load(fil)
fil.close()
else:
return 0
return sysnos
def oaicacheclean():
"Removes cached resumptionTokens older than specified"
directory = "%s/RTdata" % cachedir
files = os.listdir(directory)
for file_ in files:
filename = directory + "/" + file_
# cache entry expires when not modified during a specified period of time
if ((time.time() - os.path.getmtime(filename)) > oai_rt_expire):
os.remove(filename)
return 1
def oaicachestatus(resumptionToken):
"Checks cache status. Returns 0 for empty, 1 for full."
filename = "%s/RTdata/%s" % (cachedir, resumptionToken)
if os.path.exists(filename):
if os.path.getsize(filename) > 0:
return 1
else:
return 0
else:
return 0
def get_sets():
"Returns list of sets."
out = []
row = ['', '']
query = "SELECT setSpec,setName,setDescription FROM oaiARCHIVE"
res = run_sql(query)
for row in res:
row_bis = [row[0], row[1], row[2]]
out.append(row_bis)
return out
def parse_args(args=""):
"Parse input args"
out_args = {
"verb" : "",
"metadataPrefix" : "",
"from" : "",
"until" : "",
"set" : "",
"identifier" : "",
"resumptionToken" : ""
}
if args == "" or args == None:
pass
else:
list_of_arguments = args.split('&')
for item in list_of_arguments:
keyvalue = item.split('=')
if len(keyvalue) == 2:
if (out_args.has_key(keyvalue[0])):
if(out_args[keyvalue[0]] != ""):
out_args[keyvalue[0]] = "Error"
else:
out_args[keyvalue[0]] = urllib.unquote(keyvalue[1])
else:
out_args[keyvalue[0]] = urllib.unquote(keyvalue[1])
else:
out_args['verb'] = ""
return out_args
def check_args(arguments):
"Check OAI arguments"
out_args = {
"verb" : "",
"metadataPrefix" : "",
"from" : "",
"until" : "",
"set" : "",
"identifier" : "",
"resumptionToken" : ""
}
out = ""
## principal argument required
#
#
if verbs.has_key(arguments['verb']):
pass
else:
out = out + oai_error("badVerb", "Illegal OAI verb")
## defined args
#
#
for param in arguments.keys():
if out_args.has_key(param):
pass
else:
out = out + oai_error("badArgument", "The request includes illegal arguments")
## unique args
#
#
for param in arguments.keys():
if (arguments[param] == "Error"):
out = out + oai_error("badArgument", "The request includes illegal arguments")
## resumptionToken exclusive
#
#
if ((arguments['from'] != "" or arguments['until'] != "" or arguments['metadataPrefix'] != "" or arguments['identifier'] != "" or arguments['set'] != "") and arguments['resumptionToken'] != ""):
out = out + oai_error("badArgument", "The request includes illegal arguments")
## datestamp formats
#
#
if arguments['from'] != "" and arguments['from'] != "":
from_length = len(arguments['from'])
if check_date(arguments['from'], "T00:00:00Z") == "":
out = out + oai_error("badArgument", "Bad datestamp format in from")
else:
from_length = 0
if arguments['until'] != "" and arguments['until'] != "":
until_length = len(arguments['until'])
if check_date(arguments['until'], "T23:59:59Z") == "":
out = out + oai_error("badArgument", "Bad datestamp format in until")
else:
until_length = 0
if from_length != 0:
if until_length != 0:
if from_length != until_length:
out = out + oai_error("badArgument", "Bad datestamp format")
if arguments['from'] != "" and arguments['until'] != "" and arguments['from'] > arguments['until']:
out = out + oai_error("badArgument", "Wrong date")
## Identify exclusive
#
#
if (arguments['verb'] =="Identify" and (arguments['metadataPrefix'] != "" or arguments['identifier'] != "" or arguments['set'] != "" or arguments['from'] != "" or arguments['until'] != "" or arguments['resumptionToken'] != "")):
out = out + oai_error("badArgument", "The request includes illegal arguments")
## parameters for GetRecord
#
#
if arguments['verb'] =="GetRecord" and arguments['identifier'] == "":
out = out + oai_error("badArgument", "Record identifier missing")
if arguments['verb'] =="GetRecord" and arguments['metadataPrefix'] == "":
out = out + oai_error("badArgument", "Missing metadataPrefix")
## parameters for ListRecords and ListIdentifiers
#
#
if (arguments['verb'] =="ListRecords" or arguments['verb'] =="ListIdentifiers") and (arguments['metadataPrefix'] == "" and arguments['resumptionToken'] == ""):
out = out + oai_error("badArgument", "Missing metadataPrefix")
## Metadata prefix defined
#
#
if arguments.has_key('metadataPrefix'):
if ((arguments['metadataPrefix'] in params['metadataPrefix']) or (params['metadataPrefix'] == "")):
pass
else:
out = out + oai_error("badArgument", "Missing metadataPrefix")
return out
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