289 lines
9.9 KiB
Python
289 lines
9.9 KiB
Python
"""
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This takes a MARCXML filename as an argument and converts it into
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MARC records for the unglued edition (in .xml and .mrc formats).
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Consider it a catalogolem: http://commons.wikimedia.org/wiki/File:Arcimboldo_Librarian_Stokholm.jpg
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Use the MARCXML file for the non-unglued edition from Library of Congress.
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"""
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import logging
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import pymarc
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from copy import deepcopy
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from datetime import datetime
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from StringIO import StringIO
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from django.conf import settings
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from django.core.files.storage import default_storage
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from django.core.urlresolvers import reverse
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import regluit.core.cc as cc
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from regluit.core import models
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def makemarc(marcfile, edition):
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logger = logging.getLogger(__name__)
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try:
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license = edition.ebooks.all()[0].rights
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ebf = None
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except IndexError:
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license = None
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ebf = edition.ebook_files.all()[0]
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logger.info("Making MARC records for edition %s " % edition)
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record = pymarc.parse_xml_to_array(marcfile)[0]
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# save this for later before deleting it
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print_lccn = record.get_fields('010')[0].get_subfields('a')[0]
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fields_to_delete = []
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fields_to_delete += record.get_fields('001')
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fields_to_delete += record.get_fields('003')
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fields_to_delete += record.get_fields('005')
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fields_to_delete += record.get_fields('006')
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fields_to_delete += record.get_fields('007')
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fields_to_delete += record.get_fields('010')
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fields_to_delete += record.get_fields('040')
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for field in fields_to_delete:
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record.remove_field(field)
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# create accession number and write 001 field
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# (control field syntax is special)
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if ebf:
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(marc_record, created) = models.MARCRecord.objects.get_or_create(edition=edition,link_target='B2U')
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else:
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(marc_record, created) = models.MARCRecord.objects.get_or_create(edition=edition,link_target='UNGLUE')
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field001 = pymarc.Field(tag='001', data=marc_record.accession)
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record.add_ordered_field(field001)
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# add field indicating record originator
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field003 = pymarc.Field(tag='003', data='UnglueIt')
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record.add_ordered_field(field003)
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# update timestamp of record
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now = datetime.now()
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datestamp = now.strftime('%Y%m%d%H%M%S') + '.0'
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field005 = pymarc.Field(tag='005', data=datestamp)
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record.add_ordered_field(field005)
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# change 006, 007, 008 because this is an online resource
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field006 = pymarc.Field(
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tag='006',
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data='m o d '
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)
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record.add_ordered_field(field006)
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field007 = pymarc.Field(
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tag='007',
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data='cr'
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)
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record.add_ordered_field(field007)
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field008 = record.get_fields('008')[0]
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record.remove_field(field008)
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old_field_value = field008.value()
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new_field_value = old_field_value[:23] + 'o' + old_field_value[24:]
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field008 = pymarc.Field(tag='008', data=new_field_value)
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record.add_ordered_field(field008)
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# add IBSN for ebook where applicable; relegate print ISBN to $z
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isbn = ''
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try:
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isbn = edition.identifiers.filter(type='isbn')[0].value
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except IndexError:
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pass
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try:
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field020 = record.get_fields('020')[0]
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print_isbn = field020.get_subfields('a')[0]
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field020.delete_subfield('a')
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if isbn:
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field020.add_subfield('a', isbn)
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field020.add_subfield('z', print_isbn)
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except IndexError:
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print_isbn = None
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# change 050 and 082 indicators because LOC is no longer responsible for these
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# no easy indicator change function, so we'll just reconstruct the fields
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try:
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field050 = record.get_fields('050')[0]
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field050_new = field050
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field050_new.indicators = [' ', '4']
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record.remove_field(field050)
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record.add_ordered_field(field050_new)
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except:
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pass # if no 050 field, don't need to change indicator
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try:
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field082 = record.get_fields('082')[0]
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field082_new = field082
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field082_new.indicators = [' ', '4']
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record.remove_field(field082)
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record.add_ordered_field(field082_new)
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except:
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pass # if no 082 field, don't need to change indicator
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# add subfield to 245 indicating format
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field245 = record.get_fields('245')[0]
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field245.add_subfield('h', '[electronic resource]')
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# modify 300 field (physical description)
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field300 = record.get_fields('300')[0]
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subfield_a = field300.get_subfields('a')[0]
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if (
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subfield_a[-2:] == ' ;' or
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subfield_a[-2:] == ' :' or
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subfield_a[-2:] == ' +'
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):
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subfield_a = subfield_a[:-2]
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new300a = '1 online resource (' + subfield_a + ')'
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if field300.get_subfields('b'):
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new300a += ' :'
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field300.delete_subfield('a')
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field300.add_subfield('a', new300a)
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field300.delete_subfield('c')
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if license:
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# add 536 field (funding information)
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if edition.unglued:
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funding_info = 'The book is available as a free download thanks to the generous support of interested readers and organizations, who made donations using the crowd-funding website Unglue.it.'
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else:
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if edition.ebooks.all()[0].rights in cc.LICENSE_LIST:
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funding_info = 'The book is available as a free download thanks to a Creative Commons license.'
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else:
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funding_info = 'The book is available as a free download because it is in the Public Domain.'
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field536 = pymarc.Field(
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tag='536',
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indicators = [' ', ' '],
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subfields = [
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'a', funding_info,
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]
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)
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record.add_ordered_field(field536)
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# add 540 field (terms governing use)
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field540 = pymarc.Field(
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tag='540',
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indicators = [' ', ' '],
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subfields = [
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'a', dict(cc.CHOICES)[license],
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'u', dict(cc.GRANTS)[license],
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]
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)
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record.add_ordered_field(field540)
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# add 588 field (source of description) - credit where credit is due
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field588 = pymarc.Field(
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tag='588',
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indicators = [' ', ' '],
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subfields = [
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'a', 'Description based on print version record from the Library of Congress.',
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]
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)
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record.add_ordered_field(field588)
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# add 776 field (related editions) - preserve pISBN, LCCN, OCLCnum
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title = record.get_fields('245')[0].get_subfields('a')[0]
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title = title.split('/')[0]
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try:
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oclcnum = edition.identifiers.filter(type='oclc')[0].value
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except IndexError:
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oclcnum = None
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subfields = ['i', 'Print version: ','t', title,]
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if print_isbn:
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subfields.extend(['z', print_isbn])
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subfields.extend(['w', '(DLC) ' + print_lccn, ])
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if oclcnum:
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subfields.extend(['w', '(OCoLC) ' + oclcnum,])
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field776 = pymarc.Field(
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tag='776',
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indicators = ['0', '8'],
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subfields = subfields
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)
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record.add_ordered_field(field776)
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"""
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add 776 fields
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indicators: 0 8
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'$i Print version: '
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$t Title. <--note space
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$d is optional
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$z pISBN goes here
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harvest from 020 (was moved from $a to $z)
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$w (DLC) LCCN_goes_here
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harvest from 010 field before deletion
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$w (OCoLC) OCLCnum_goes_here
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harvest from identifiers db
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"""
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# strip any 9XX fields (they're for local use)
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for i in range(900, 1000):
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fields = record.get_fields(str(i))
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for field in fields:
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record.remove_field(field)
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# add 856 fields with links for each available file
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# doing this out of order as it's the only thing that differs
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# between direct-link and via-unglue.it versions
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if not ebf:
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# need deepcopy() because omg referential transparency!
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record_direct = deepcopy(record) # 2 records for unglued stuff
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for format_tuple in settings.FORMATS:
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format = format_tuple[0]
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ebooks = edition.ebooks.filter(format=format)
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if ebooks:
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for book in ebooks:
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field856 = pymarc.Field(
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tag='856',
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indicators = ['4', '0'],
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subfields = [
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'3', format + ' version',
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'q', settings.CONTENT_TYPES[format],
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'u', book.url,
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]
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)
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record_direct.add_ordered_field(field856)
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unglued_url = settings.BASE_URL_SECURE + reverse('download', args=[edition.work.id])
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field856_via = pymarc.Field(
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tag='856',
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indicators = ['4', '0'],
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subfields = [
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'u', unglued_url,
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]
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)
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record.add_ordered_field(field856_via)
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if not ebf:
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# this via_unglueit record needs its own accession number
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field001 = record_direct.get_fields('001')[0]
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record_direct.remove_field(field001)
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(marc_record_direct, created) = models.MARCRecord.objects.get_or_create(edition=edition,link_target='DIRECT')
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field001 = pymarc.Field(tag='001', data=marc_record_direct.accession)
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record_direct.add_ordered_field(field001)
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# write the unglued MARCxml records
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xmlrecord = pymarc.record_to_xml(record_direct)
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xml_file = default_storage.open(marc_record_direct.xml_record, 'w')
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xml_file.write(xmlrecord)
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xml_file.close()
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# write the unglued .mrc records, then save to s3
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mrc_file = default_storage.open(marc_record_direct.mrc_record, 'w')
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writer = pymarc.MARCWriter(mrc_file)
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writer.write(record_direct)
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mrc_file.close()
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xmlrecord = pymarc.record_to_xml(record)
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xml_file = default_storage.open(marc_record.xml_record, 'w')
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xml_file.write(xmlrecord)
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xml_file.close()
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mrc_file = default_storage.open(marc_record.mrc_record, 'w')
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writer = pymarc.MARCWriter(mrc_file)
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writer.write(record)
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mrc_file.close()
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