bibedit_engine.py
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bibedit_engine.py
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	## This file is part of Invenio.
	## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 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.

	# pylint: disable=C0103
	"""Invenio BibEdit Engine."""

	__revision__ = "$Id"

	from invenio.bibedit_config import CFG_BIBEDIT_AJAX_RESULT_CODES, \
	CFG_BIBEDIT_JS_CHECK_SCROLL_INTERVAL, CFG_BIBEDIT_JS_HASH_CHECK_INTERVAL, \
	CFG_BIBEDIT_JS_CLONED_RECORD_COLOR, \
	CFG_BIBEDIT_JS_CLONED_RECORD_COLOR_FADE_DURATION, \
	CFG_BIBEDIT_JS_NEW_ADD_FIELD_FORM_COLOR, \
	CFG_BIBEDIT_JS_NEW_ADD_FIELD_FORM_COLOR_FADE_DURATION, \
	CFG_BIBEDIT_JS_NEW_CONTENT_COLOR, \
	CFG_BIBEDIT_JS_NEW_CONTENT_COLOR_FADE_DURATION, \
	CFG_BIBEDIT_JS_NEW_CONTENT_HIGHLIGHT_DELAY, \
	CFG_BIBEDIT_JS_STATUS_ERROR_TIME, CFG_BIBEDIT_JS_STATUS_INFO_TIME, \
	CFG_BIBEDIT_JS_TICKET_REFRESH_DELAY, CFG_BIBEDIT_MAX_SEARCH_RESULTS, \
	CFG_BIBEDIT_TAG_FORMAT, CFG_BIBEDIT_AJAX_RESULT_CODES_REV, \
	CFG_BIBEDIT_AUTOSUGGEST_TAGS, CFG_BIBEDIT_AUTOCOMPLETE_TAGS_KBS,\
	CFG_BIBEDIT_KEYWORD_TAXONOMY, CFG_BIBEDIT_KEYWORD_TAG, \
	CFG_BIBEDIT_KEYWORD_RDFLABEL

	from invenio.bibedit_dblayer import get_name_tags_all, reserve_record_id, \
	get_related_hp_changesets, get_hp_update_xml, delete_hp_change, \
	get_record_last_modification_date, get_record_revision_author, \
	get_marcxml_of_record_revision, delete_related_holdingpen_changes, \
	get_record_revisions

	from invenio.bibedit_utils import cache_exists, cache_expired, \
	create_cache_file, delete_cache_file, get_bibrecord, \
	get_cache_file_contents, get_cache_mtime, get_record_templates, \
	get_record_template, latest_record_revision, record_locked_by_other_user, \
	record_locked_by_queue, save_xml_record, touch_cache_file, \
	update_cache_file_contents, get_field_templates, get_marcxml_of_revision, \
	revision_to_timestamp, timestamp_to_revision, \
	get_record_revision_timestamps, record_revision_exists

	from invenio.bibrecord import create_record, print_rec, record_add_field, \
	record_add_subfield_into, record_delete_field, \
	record_delete_subfield_from, \
	record_modify_subfield, record_move_subfield, \
	create_field, record_replace_field, record_move_fields, \
	record_modify_controlfield, record_get_field_values
	from invenio.config import CFG_BIBEDIT_PROTECTED_FIELDS, CFG_CERN_SITE, \
	CFG_SITE_URL
	from invenio.search_engine import record_exists, search_pattern
	from invenio.webuser import session_param_get, session_param_set
	from invenio.bibcatalog import bibcatalog_system
	from invenio.webpage import page
	from invenio.bibknowledge import get_kbd_values_for_bibedit, get_kbr_values, \
	get_kbt_items_for_bibedit #autosuggest

	import re
	import difflib
	import zlib
	import sys
	if sys.hexversion < 0x2060000:
	try:
	import simplejson as json
	simplejson_available = True
	except ImportError:
	# Okay, no Ajax app will be possible, but continue anyway,
	# since this package is only recommended, not mandatory.
	simplejson_available = False
	else:
	import json
	simplejson_available = True



	import invenio.template
	bibedit_templates = invenio.template.load('bibedit')

	re_revdate_split = re.compile('^(\d\d\d\d)(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)')

	def get_empty_fields_templates():
	"""
	Returning the templates of empty fields :
	- an empty data field
	- an empty control field
	"""
	return [{
	"name": "Empty field",
	"description": "The data field not containing any " + \
	"information filled in",
	"tag" : "",
	"ind1" : "",
	"ind2" : "",
	"subfields" : [("","")],
	"isControlfield" : False
	},{
	"name" : "Empty control field",
	"description" : "The controlfield not containing any " + \
	"data or tag description",
	"isControlfield" : True,
	"tag" : "",
	"value" : ""
	}]

	def get_available_fields_templates():
	"""
	A method returning all the available field templates
	Returns a list of descriptors. Each descriptor has
	the same structure as a full field descriptor inside the
	record
	"""
	templates = get_field_templates()
	result = get_empty_fields_templates()
	for template in templates:
	tplTag = template[3].keys()[0]
	field = template[3][tplTag][0]

	if (field[0] == []):
	# if the field is a controlField, add different structure
	result.append({
	"name" : template[1],
	"description" : template[2],
	"isControlfield" : True,
	"tag" : tplTag,
	"value" : field[3]
	})
	else:
	result.append({
	"name": template[1],
	"description": template[2],
	"tag" : tplTag,
	"ind1" : field[1],
	"ind2" : field[2],
	"subfields" : field[0],
	"isControlfield" : False
	})
	return result

	def perform_request_init(uid, ln, req, lastupdated):
	"""Handle the initial request by adding menu and JavaScript to the page."""
	errors = []
	warnings = []
	body = ''

	# Add script data.
	record_templates = get_record_templates()
	record_templates.sort()
	tag_names = get_name_tags_all()
	protected_fields = ['001']
	protected_fields.extend(CFG_BIBEDIT_PROTECTED_FIELDS.split(','))
	history_url = '"' + CFG_SITE_URL + '/admin/bibedit/bibeditadmin.py/history"'
	cern_site = 'false'

	if not simplejson_available:
	title = 'Record Editor'
	body = '''Sorry, the record editor cannot operate when the
	`simplejson' module is not installed. Please see the INSTALL
	file.'''
	return page(title = title,
	body = body,
	errors = [],
	warnings = [],
	uid = uid,
	language = ln,
	navtrail = "",
	lastupdated = lastupdated,
	req = req)


	if CFG_CERN_SITE:
	cern_site = 'true'
	data = {'gRECORD_TEMPLATES': record_templates,
	'gTAG_NAMES': tag_names,
	'gPROTECTED_FIELDS': protected_fields,
	'gSITE_URL': '"' + CFG_SITE_URL + '"',
	'gHISTORY_URL': history_url,
	'gCERN_SITE': cern_site,
	'gHASH_CHECK_INTERVAL': CFG_BIBEDIT_JS_HASH_CHECK_INTERVAL,
	'gCHECK_SCROLL_INTERVAL': CFG_BIBEDIT_JS_CHECK_SCROLL_INTERVAL,
	'gSTATUS_ERROR_TIME': CFG_BIBEDIT_JS_STATUS_ERROR_TIME,
	'gSTATUS_INFO_TIME': CFG_BIBEDIT_JS_STATUS_INFO_TIME,
	'gCLONED_RECORD_COLOR':
	'"' + CFG_BIBEDIT_JS_CLONED_RECORD_COLOR + '"',
	'gCLONED_RECORD_COLOR_FADE_DURATION':
	CFG_BIBEDIT_JS_CLONED_RECORD_COLOR_FADE_DURATION,
	'gNEW_ADD_FIELD_FORM_COLOR':
	'"' + CFG_BIBEDIT_JS_NEW_ADD_FIELD_FORM_COLOR + '"',
	'gNEW_ADD_FIELD_FORM_COLOR_FADE_DURATION':
	CFG_BIBEDIT_JS_NEW_ADD_FIELD_FORM_COLOR_FADE_DURATION,
	'gNEW_CONTENT_COLOR': '"' + CFG_BIBEDIT_JS_NEW_CONTENT_COLOR + '"',
	'gNEW_CONTENT_COLOR_FADE_DURATION':
	CFG_BIBEDIT_JS_NEW_CONTENT_COLOR_FADE_DURATION,
	'gNEW_CONTENT_HIGHLIGHT_DELAY':
	CFG_BIBEDIT_JS_NEW_CONTENT_HIGHLIGHT_DELAY,
	'gTICKET_REFRESH_DELAY': CFG_BIBEDIT_JS_TICKET_REFRESH_DELAY,
	'gRESULT_CODES': CFG_BIBEDIT_AJAX_RESULT_CODES,
	'gAUTOSUGGEST_TAGS' : CFG_BIBEDIT_AUTOSUGGEST_TAGS,
	'gAUTOCOMPLETE_TAGS' : CFG_BIBEDIT_AUTOCOMPLETE_TAGS_KBS.keys(),
	'gKEYWORD_TAG' : '"' + CFG_BIBEDIT_KEYWORD_TAG + '"'
	}
	body += '<script type="text/javascript">\n'
	for key in data:
	body += ' var %s = %s;\n' % (key, data[key])
	body += ' </script>\n'

	# Adding the information about field templates
	fieldTemplates = get_available_fields_templates()
	body += "<script>\n" + \
	" var fieldTemplates = %s\n" % (json.dumps(fieldTemplates), ) + \
	"</script>\n"
	# Add scripts (the ordering is NOT irrelevant).
	scripts = ['jquery.min.js', 'jquery.effects.core.min.js',
	'jquery.effects.highlight.min.js', 'jquery.autogrow.js',
	'jquery.jeditable.mini.js', 'jquery.hotkeys.min.js', 'json2.js',
	'bibedit_display.js', 'bibedit_engine.js', 'bibedit_keys.js',
	'bibedit_menu.js', 'bibedit_holdingpen.js', 'marcxml.js',
	'bibedit_clipboard.js']

	for script in scripts:
	body += ' <script type="text/javascript" src="%s/js/%s">' \
	'</script>\n' % (CFG_SITE_URL, script)

	# Build page structure and menu.
	# rec = create_record(format_record(235, "xm"))[0]
	#oaiId = record_extract_oai_id(rec)

	body += bibedit_templates.menu()
	body += ' <div id="bibEditContent"></div>\n'

	return body, errors, warnings

	def get_xml_comparison(header1, header2, xml1, xml2):
	"""
	Return diffs of two MARCXML records.
	"""
	return "".join(difflib.unified_diff(xml1.splitlines(1),
	xml2.splitlines(1), header1, header2))

	def get_marcxml_of_revision_id(recid, revid):
	"""
	Return MARCXML string with corresponding to revision REVID
	(=RECID.REVDATE) of a record. Return empty string if revision
	does not exist.
	"""
	res = ""
	job_date = "%s-%s-%s %s:%s:%s" % re_revdate_split.search(revid).groups()
	tmp_res = get_marcxml_of_record_revision(recid, job_date)
	if tmp_res:
	for row in tmp_res:
	res += zlib.decompress(row[0]) + "\n"
	return res

	def perform_request_compare(ln, recid, rev1, rev2):
	"""Handle a request for comparing two records"""
	body = ""
	errors = []
	warnings = []

	if (not record_revision_exists(recid, rev1)) or \
	(not record_revision_exists(recid, rev2)):
	body = "The requested record revision does not exist !"
	else:
	xml1 = get_marcxml_of_revision_id(recid, rev1)
	xml2 = get_marcxml_of_revision_id(recid, rev2)
	fullrevid1 = "%i.%s" % (recid, rev1)
	fullrevid2 = "%i.%s" % (recid, rev2)
	comparison = bibedit_templates.clean_value(
	get_xml_comparison(fullrevid1, fullrevid2, xml1, xml2),
	'text').replace('\n', '<br />\n ')
	job_date1 = "%s-%s-%s %s:%s:%s" % re_revdate_split.search(rev1).groups()
	job_date2 = "%s-%s-%s %s:%s:%s" % re_revdate_split.search(rev2).groups()
	body += bibedit_templates.history_comparebox(ln, job_date1,
	job_date2, comparison)
	return body, errors, warnings

	def perform_request_newticket(recid, uid):
	"""create a new ticket with this record's number
	@param recid: record id
	@param uid: user id
	@return: (error_msg, url)

	"""
	t_id = bibcatalog_system.ticket_submit(uid, "", recid, "")
	t_url = ""
	errmsg = ""
	if t_id:
	#get the ticket's URL
	t_url = bibcatalog_system.ticket_get_attribute(uid, t_id, 'url_modify')
	else:
	errmsg = "ticket_submit failed"
	return (errmsg, t_url)

	def perform_request_ajax(req, recid, uid, data, isBulk = False):
	"""Handle Ajax requests by redirecting to appropriate function."""
	response = {}
	request_type = data['requestType']
	undo_redo = None
	if data.has_key("undoRedo"):
	undo_redo = data["undoRedo"]
	# Call function based on request type.
	if request_type == 'searchForRecord':
	# Search request.
	response.update(perform_request_search(data))
	elif request_type in ['changeTagFormat']:
	# User related requests.
	response.update(perform_request_user(req, request_type, recid, data))
	elif request_type in ('getRecord', 'submit', 'cancel', 'newRecord',
	'deleteRecord', 'deleteRecordCache', 'prepareRecordMerge', 'revert'):
	# 'Major' record related requests.
	response.update(perform_request_record(req, request_type, recid, uid,
	data))
	elif request_type in ('addField', 'addSubfields', \
	'addFieldsSubfieldsOnPositions', 'modifyContent', \
	'moveSubfield', 'deleteFields', 'moveField', \
	'modifyField', 'otherUpdateRequest', \
	'disableHpChange', 'deactivateHoldingPenChangeset'):
	# Record updates.
	cacheMTime = data['cacheMTime']
	if data.has_key('hpChanges'):
	hpChanges = data['hpChanges']
	else:
	hpChanges = {}

	response.update(perform_request_update_record(request_type, recid, \
	uid, cacheMTime, data, \
	hpChanges, undo_redo, \
	isBulk))
	elif request_type in ('autosuggest', 'autocomplete', 'autokeyword'):
	response.update(perform_request_autocomplete(request_type, recid, uid, \
	data))

	elif request_type in ('getTickets', ):
	# BibCatalog requests.
	response.update(perform_request_bibcatalog(request_type, recid, uid))
	elif request_type in ('getHoldingPenUpdates', ):
	response.update(perform_request_holdingpen(request_type, recid))

	elif request_type in ('getHoldingPenUpdateDetails', \
	'deleteHoldingPenChangeset'):
	updateId = data['changesetNumber']
	response.update(perform_request_holdingpen(request_type, recid, \
	updateId))
	elif request_type in ('applyBulkUpdates', ):
	# a general version of a bulk request
	changes = data['requestsData']
	cacheMTime = data['cacheMTime']
	response.update(perform_bulk_request_ajax(req, recid, uid, changes, \
	undo_redo, cacheMTime))
	return response

	def perform_bulk_request_ajax(req, recid, uid, reqsData, undoRedo, cacheMTime):
	""" An AJAX handler used when treating bulk updates """
	lastResult = {}
	lastTime = cacheMTime
	isFirst = True
	for data in reqsData:
	assert data != None
	data['cacheMTime'] = lastTime
	if isFirst and undoRedo != None:
	# we add the undo/redo handler to the first operation in order to
	# save the handler on the server side !
	data['undoRedo'] = undoRedo
	isFirst = False
	lastResult = perform_request_ajax(req, recid, uid, data, True)
	# now we have to update the cacheMtime in next request !
	# if lastResult.has_key('cacheMTime'):
	try:
	lastTime = lastResult['cacheMTime']
	except:
	raise Exception(str(lastResult))
	return lastResult

	def perform_request_search(data):
	"""Handle search requests."""
	response = {}
	searchType = data['searchType']
	searchPattern = data['searchPattern']
	if searchType == 'anywhere':
	pattern = searchPattern
	else:
	pattern = searchType + ':' + searchPattern
	result_set = list(search_pattern(p=pattern))
	response['resultCode'] = 1
	response['resultSet'] = result_set[0:CFG_BIBEDIT_MAX_SEARCH_RESULTS]
	return response

	def perform_request_user(req, request_type, recid, data):
	"""Handle user related requests."""
	response = {}
	if request_type == 'changeTagFormat':
	try:
	tagformat_settings = session_param_get(req, 'bibedit_tagformat')
	except KeyError:
	tagformat_settings = {}
	tagformat_settings[recid] = data['tagFormat']
	session_param_set(req, 'bibedit_tagformat', tagformat_settings)
	response['resultCode'] = 2
	return response

	def perform_request_holdingpen(request_type, recId, changeId=None):
	"""
	A method performing the holdingPen ajax request. The following types of
	requests can be made:
	getHoldingPenUpdates - retrieving the holding pen updates pending
	for a given record
	"""
	response = {}
	if request_type == 'getHoldingPenUpdates':
	changeSet = get_related_hp_changesets(recId)
	changes = []
	for change in changeSet:
	changes.append((str(change[0]), str(change[1])))
	response["changes"] = changes
	elif request_type == 'getHoldingPenUpdateDetails':
	# returning the list of changes related to the holding pen update
	# the format based on what the record difference xtool returns

	assert(changeId != None)
	hpContent = get_hp_update_xml(changeId)
	holdingPenRecord = create_record(hpContent[0], "xm")[0]
	# databaseRecord = get_record(hpContent[1])
	response['record'] = holdingPenRecord
	response['changeset_number'] = changeId
	elif request_type == 'deleteHoldingPenChangeset':
	assert(changeId != None)
	delete_hp_change(changeId)
	return response

	def perform_request_record(req, request_type, recid, uid, data):
	"""Handle 'major' record related requests like fetching, submitting or
	deleting a record, cancel editing or preparing a record for merging.

	"""
	response = {}

	if request_type == 'newRecord':
	# Create a new record.
	new_recid = reserve_record_id()
	new_type = data['newType']
	if new_type == 'empty':
	# Create a new empty record.
	create_cache_file(recid, uid)
	response['resultCode'], response['newRecID'] = 6, new_recid

	elif new_type == 'template':
	# Create a new record from XML record template.
	template_filename = data['templateFilename']
	template = get_record_template(template_filename)
	if not template:
	response['resultCode'] = 108
	else:
	record = create_record(template)[0]
	if not record:
	response['resultCode'] = 109
	else:
	record_add_field(record, '001',
	controlfield_value=str(new_recid))
	create_cache_file(new_recid, uid, record, True)
	response['resultCode'], response['newRecID'] = 7, new_recid

	elif new_type == 'clone':
	# Clone an existing record (from the users cache).
	existing_cache = cache_exists(recid, uid)
	if existing_cache:
	try:
	record = get_cache_file_contents(recid, uid)[2]
	except:
	# if, for example, the cache format was wrong (outdated)
	record = get_bibrecord(recid)
	else:
	# Cache missing. Fall back to using original version.
	record = get_bibrecord(recid)
	record_delete_field(record, '001')
	record_add_field(record, '001', controlfield_value=str(new_recid))
	create_cache_file(new_recid, uid, record, True)
	response['resultCode'], response['newRecID'] = 8, new_recid
	elif request_type == 'getRecord':
	# Fetch the record. Possible error situations:
	# - Non-existing record
	# - Deleted record
	# - Record locked by other user
	# - Record locked by queue
	# A cache file will be created if it does not exist.
	# If the cache is outdated (i.e., not based on the latest DB revision),
	# cacheOutdated will be set to True in the response.
	record_status = record_exists(recid)
	existing_cache = cache_exists(recid, uid)
	read_only_mode = False
	if data.has_key("inReadOnlyMode"):
	read_only_mode = data['inReadOnlyMode']

	if record_status == 0:
	response['resultCode'] = 102
	elif record_status == -1:
	response['resultCode'] = 103
	elif not read_only_mode and not existing_cache and \
	record_locked_by_other_user(recid, uid):
	response['resultCode'] = 104
	elif not read_only_mode and existing_cache and \
	cache_expired(recid, uid) and \
	record_locked_by_other_user(recid, uid):
	response['resultCode'] = 104
	elif not read_only_mode and record_locked_by_queue(recid):
	response['resultCode'] = 105
	else:
	if data.get('deleteRecordCache'):
	delete_cache_file(recid, uid)
	existing_cache = False
	pending_changes = []
	disabled_hp_changes = {}
	if read_only_mode:
	if data.has_key('recordRevision'):
	record_revision_ts = data['recordRevision']
	record_xml = get_marcxml_of_revision(recid, \
	record_revision_ts)
	record = create_record(record_xml)[0]
	record_revision = timestamp_to_revision(record_revision_ts)
	pending_changes = []
	disabled_hp_changes = {}
	else:
	# a normal cacheless retrieval of a record
	record = get_bibrecord(recid)
	record_revision = get_record_last_modification_date(recid)
	pending_changes = []
	disabled_hp_changes = {}
	cache_dirty = False
	mtime = 0
	undo_list = []
	redo_list = []
	elif not existing_cache:
	record_revision, record = create_cache_file(recid, uid)
	mtime = get_cache_mtime(recid, uid)
	pending_changes = []
	disabled_hp_changes = {}
	undo_list = []
	redo_list = []
	cache_dirty = False
	else:
	#TODO: This try except should be replaced with something nicer,
	# like an argument indicating if a new cache file is to
	# be created
	try:
	cache_dirty, record_revision, record, pending_changes, \
	disabled_hp_changes, undo_list, redo_list = \
	get_cache_file_contents(recid, uid)
	touch_cache_file(recid, uid)
	mtime = get_cache_mtime(recid, uid)
	if not latest_record_revision(recid, record_revision) and \
	get_record_revisions(recid) != ():
	# This sould prevent from using old cache in case of
	# viewing old version. If there are no revisions,
	# it means we should skip this step because this
	# is a new record
	response['cacheOutdated'] = True

	except:
	record_revision, record = create_cache_file(recid, uid)
	mtime = get_cache_mtime(recid, uid)
	pending_changes = []
	disabled_hp_changes = {}
	cache_dirty = False
	undo_list = []
	redo_list = []
	if data['clonedRecord']:
	response['resultCode'] = 9
	else:
	response['resultCode'] = 3
	revision_author = get_record_revision_author(recid, record_revision)
	last_revision_ts = revision_to_timestamp( \
	get_record_last_modification_date(recid))
	revisions_history = get_record_revision_timestamps(recid)

	response['cacheDirty'], response['record'], \
	response['cacheMTime'], response['recordRevision'], \
	response['revisionAuthor'], response['lastRevision'], \
	response['revisionsHistory'], response['inReadOnlyMode'], \
	response['pendingHpChanges'], response['disabledHpChanges'], \
	response['undoList'], response['redoList'] = cache_dirty, \
	record, mtime, revision_to_timestamp(record_revision), \
	revision_author, last_revision_ts, revisions_history, \
	read_only_mode, pending_changes, disabled_hp_changes, \
	undo_list, redo_list
	# Set tag format from user's session settings.
	try:
	tagformat_settings = session_param_get(req, 'bibedit_tagformat')
	tagformat = tagformat_settings[recid]
	except KeyError:
	tagformat = CFG_BIBEDIT_TAG_FORMAT
	response['tagFormat'] = tagformat

	elif request_type == 'submit':
	# Submit the record. Possible error situations:
	# - Missing cache file
	# - Cache file modified in other editor
	# - Record locked by other user
	# - Record locked by queue
	# - Invalid XML characters
	# If the cache is outdated cacheOutdated will be set to True in the
	# response.
	if not cache_exists(recid, uid):
	response['resultCode'] = 106
	elif not get_cache_mtime(recid, uid) == data['cacheMTime']:
	response['resultCode'] = 107
	elif cache_expired(recid, uid) and \
	record_locked_by_other_user(recid, uid):
	response['resultCode'] = 104
	elif record_locked_by_queue(recid):
	response['resultCode'] = 105
	else:
	try:
	tmp_result = get_cache_file_contents(recid, uid)
	record_revision = tmp_result[1]
	record = tmp_result[2]
	pending_changes = tmp_result[3]
	# disabled_changes = tmp_result[4]

	xml_record = print_rec(record)
	record, status_code, list_of_errors = create_record(xml_record)
	if status_code == 0:
	response['resultCode'], response['errors'] = 110, \
	list_of_errors
	elif not data['force'] and \
	not latest_record_revision(recid, record_revision):
	response['cacheOutdated'] = True
	else:
	save_xml_record(recid, uid)
	response['resultCode'] = 4
	except:
	response['resultCode'] = CFG_BIBEDIT_AJAX_RESULT_CODES_REV[ \
	'wrong_cache_file_format']
	elif request_type == 'revert':
	revId = data['revId']
	job_date = "%s-%s-%s %s:%s:%s" % re_revdate_split.search(revId).groups()
	revision_xml = get_marcxml_of_revision(recid, job_date)
	save_xml_record(recid, uid, revision_xml)
	if (cache_exists(recid, uid)):
	delete_cache_file(recid, uid)
	response['resultCode'] = 4

	elif request_type == 'cancel':
	# Cancel editing by deleting the cache file. Possible error situations:
	# - Cache file modified in other editor
	if cache_exists(recid, uid):
	if get_cache_mtime(recid, uid) == data['cacheMTime']:
	delete_cache_file(recid, uid)
	response['resultCode'] = 5
	else:
	response['resultCode'] = 107
	else:
	response['resultCode'] = 5

	elif request_type == 'deleteRecord':
	# Submit the record. Possible error situations:
	# - Record locked by other user
	# - Record locked by queue
	# As the user is requesting deletion we proceed even if the cache file
	# is missing and we don't check if the cache is outdated or has
	# been modified in another editor.
	existing_cache = cache_exists(recid, uid)
	pending_changes = []
	if existing_cache and cache_expired(recid, uid) and \
	record_locked_by_other_user(recid, uid):
	response['resultCode'] = 104
	elif record_locked_by_queue(recid):
	response['resultCode'] = 105
	else:
	if not existing_cache:
	record_revision, record, pending_changes, \
	deactivated_hp_changes, undo_list, redo_list = \
	create_cache_file(recid, uid)
	else:
	try:
	record_revision, record, pending_changes, \
	deactivated_hp_changes, undo_list, redo_list = \
	get_cache_file_contents(recid, uid)[1:]
	except:
	record_revision, record, pending_changes, \
	deactivated_hp_changes = create_cache_file(recid, uid)
	record_add_field(record, '980', ' ', ' ', '', [('c', 'DELETED')])
	undo_list = []
	redo_list = []
	update_cache_file_contents(recid, uid, record_revision, record, \
	pending_changes, \
	deactivated_hp_changes, undo_list, \
	redo_list)
	save_xml_record(recid, uid)
	delete_related_holdingpen_changes(recid) # we don't need any changes
	# related to a deleted record
	response['resultCode'] = 10

	elif request_type == 'deleteRecordCache':
	# Delete the cache file. Ignore the request if the cache has been
	# modified in another editor.
	if cache_exists(recid, uid) and get_cache_mtime(recid, uid) == \
	data['cacheMTime']:
	delete_cache_file(recid, uid)
	response['resultCode'] = 11

	elif request_type == 'prepareRecordMerge':
	# We want to merge the cache with the current DB version of the record,
	# so prepare an XML file from the file cache, to be used by BibMerge.
	# Possible error situations:
	# - Missing cache file
	# - Record locked by other user
	# - Record locked by queue
	# We don't check if cache is outdated (a likely scenario for this
	# request) or if it has been modified in another editor.
	if not cache_exists(recid, uid):
	response['resultCode'] = 106
	elif cache_expired(recid, uid) and \
	record_locked_by_other_user(recid, uid):
	response['resultCode'] = 104
	elif record_locked_by_queue(recid):
	response['resultCode'] = 105
	else:
	save_xml_record(recid, uid, to_upload=False, to_merge=True)
	response['resultCode'] = 12

	return response

	def perform_request_update_record(request_type, recid, uid, cacheMTime, data, \
	hpChanges, undoRedoOp, isBulk=False):
	"""Handle record update requests like adding, modifying, moving or deleting
	of fields or subfields. Possible common error situations:
	- Missing cache file
	- Cache file modified in other editor
	Explanation of some parameters:
	undoRedoOp - Indicates in "undo"/"redo"/undo_descriptor operation is
	performed by a current request.
	"""

	response = {}

	if not cache_exists(recid, uid):
	response['resultCode'] = 106
	elif not get_cache_mtime(recid, uid) == cacheMTime and isBulk == False:
	# In case of a bulk request, the changes are deliberately performed
	# imemdiately one after another
	response['resultCode'] = 107
	else:
	try:
	record_revision, record, pending_changes, deactivated_hp_changes, \
	undo_list, redo_list = get_cache_file_contents(recid, uid)[1:]
	except:
	response['resultCode'] = CFG_BIBEDIT_AJAX_RESULT_CODES_REV[ \
	'wrong_cache_file_format']
	return response

	# process all the Holding Pen changes operations ... regardles the
	# request type
	# import rpdb2;
	# rpdb2.start_embedded_debugger('password', fAllowRemote=True)
	if hpChanges.has_key("toDisable"):
	for changeId in hpChanges["toDisable"]:
	pending_changes[changeId]["applied_change"] = True

	if hpChanges.has_key("toEnable"):
	for changeId in hpChanges["toEnable"]:
	pending_changes[changeId]["applied_change"] = False

	if hpChanges.has_key("toOverride"):
	pending_changes = hpChanges["toOverride"]

	if hpChanges.has_key("changesetsToDeactivate"):
	for changesetId in hpChanges["changesetsToDeactivate"]:
	deactivated_hp_changes[changesetId] = True

	if hpChanges.has_key("changesetsToActivate"):
	for changesetId in hpChanges["changesetsToActivate"]:
	deactivated_hp_changes[changesetId] = False

	# processing the undo/redo entries
	if undoRedoOp == "undo":
	try:
	redo_list = [undo_list[-1]] + redo_list
	undo_list = undo_list[:-1]
	except:
	raise Exception("An exception occured when undoing previous" + \
	" operation. Undo list: " + str(undo_list) + \
	" Redo list " + str(redo_list))
	elif undoRedoOp == "redo":
	try:
	undo_list = undo_list + [redo_list[0]]
	redo_list = redo_list[1:]
	except:
	raise Exception("An exception occured when redoing previous" + \
	" operation. Undo list: " + str(undo_list) + \
	" Redo list " + str(redo_list))
	else:
	# This is a genuine operation - we have to add a new descriptor
	# to the undo list and cancel the redo unless the operation is
	# a bulk operation
	if undoRedoOp != None:
	undo_list = undo_list + [undoRedoOp]
	redo_list = []
	else:
	assert isBulk == True

	field_position_local = data.get('fieldPosition')
	if field_position_local is not None:
	field_position_local = int(field_position_local)
	if request_type == 'otherUpdateRequest':
	# An empty request. Might be useful if we want to perform
	# operations that require only the actions performed globally,
	# like modifying the holdingPen changes list
	response['resultCode'] = CFG_BIBEDIT_AJAX_RESULT_CODES_REV[ \
	'editor_modifications_changed']
	elif request_type == 'deactivateHoldingPenChangeset':
	# the changeset has been marked as processed ( user applied it in
	# the editor). Marking as used in the cache file.
	# CAUTION: This function has been implemented here because logically
	# it fits with the modifications made to the cache file.
	# No changes are made to the Holding Pen physically. The
	# changesets are related to the cache because we want to
	# cancel the removal every time the cache disappears for
	# any reason
	response['resultCode'] = CFG_BIBEDIT_AJAX_RESULT_CODES_REV[ \
	'disabled_hp_changeset']
	elif request_type == 'addField':
	if data['controlfield']:
	record_add_field(record, data['tag'],
	controlfield_value=data['value'])
	response['resultCode'] = 20
	else:
	record_add_field(record, data['tag'], data['ind1'],
	data['ind2'], subfields=data['subfields'],
	field_position_local=field_position_local)
	response['resultCode'] = 21

	elif request_type == 'addSubfields':
	subfields = data['subfields']
	for subfield in subfields:
	record_add_subfield_into(record, data['tag'], subfield[0],
	subfield[1], subfield_position=None,
	field_position_local=field_position_local)
	if len(subfields) == 1:
	response['resultCode'] = 22
	else:
	response['resultCode'] = 23
	elif request_type == 'addFieldsSubfieldsOnPositions':
	#1) Sorting the fields by their identifiers
	fieldsToAdd = data['fieldsToAdd']
	subfieldsToAdd = data['subfieldsToAdd']
	for tag in fieldsToAdd.keys():
	positions = fieldsToAdd[tag].keys()
	positions.sort()
	for position in positions:
	# now adding fields at a position

	isControlfield = (len(fieldsToAdd[tag][position][0]) == 0)
	# if there are n subfields, this is a control field
	if isControlfield:
	controlfieldValue = fieldsToAdd[tag][position][3]
	record_add_field(record, tag, field_position_local = \
	int(position), \
	controlfield_value = \
	controlfieldValue)
	else:
	subfields = fieldsToAdd[tag][position][0]
	ind1 = fieldsToAdd[tag][position][1]
	ind2 = fieldsToAdd[tag][position][2]
	record_add_field(record, tag, ind1, ind2, subfields = \
	subfields, field_position_local = \
	int(position))
	# now adding the subfields
	for tag in subfieldsToAdd.keys():
	for fieldPosition in subfieldsToAdd[tag].keys(): #now the fields
	#order not important !
	subfieldsPositions = subfieldsToAdd[tag][fieldPosition]. \
	keys()
	subfieldsPositions.sort()
	for subfieldPosition in subfieldsPositions:
	subfield = subfieldsToAdd[tag][fieldPosition]\
	[subfieldPosition]
	record_add_subfield_into(record, tag, subfield[0], \
	subfield[1], \
	subfield_position = \
	int(subfieldPosition), \
	field_position_local = \
	int(fieldPosition))

	response['resultCode'] = \
	CFG_BIBEDIT_AJAX_RESULT_CODES_REV['added_positioned_subfields']

	elif request_type == 'modifyField': # changing the field structure
	# first remove subfields and then add new... change the indices
	subfields = data['subFields'] # parse the JSON representation of
	# the subfields here

	new_field = create_field(subfields, data['ind1'], data['ind2'])
	record_replace_field(record, data['tag'], new_field, \
	field_position_local = data['fieldPosition'])
	response['resultCode'] = 26

	elif request_type == 'modifyContent':
	if data['subfieldIndex'] != None:
	record_modify_subfield(record, data['tag'],
	data['subfieldCode'], data['value'],
	int(data['subfieldIndex']),
	field_position_local=field_position_local)
	else:
	record_modify_controlfield(record, data['tag'], data["value"],
	field_position_local=field_position_local)
	response['resultCode'] = 24

	elif request_type == 'moveSubfield':
	record_move_subfield(record, data['tag'],
	int(data['subfieldIndex']), int(data['newSubfieldIndex']),
	field_position_local=field_position_local)
	response['resultCode'] = 25

	elif request_type == 'moveField':
	if data['direction'] == 'up':
	final_position_local = field_position_local-1
	else: # direction is 'down'
	final_position_local = field_position_local+1
	record_move_fields(record, data['tag'], [field_position_local],
	final_position_local)
	response['resultCode'] = 32

	elif request_type == 'deleteFields':
	to_delete = data['toDelete']
	deleted_fields = 0
	deleted_subfields = 0
	for tag in to_delete:
	#Sorting the fields in a edcreasing order by the local position!
	fieldsOrder = to_delete[tag].keys()
	fieldsOrder.sort(lambda a, b: int(b) - int(a))
	for field_position_local in fieldsOrder:
	if not to_delete[tag][field_position_local]:
	# No subfields specified - delete entire field.
	record_delete_field(record, tag,
	field_position_local=int(field_position_local))
	deleted_fields += 1
	else:
	for subfield_position in \
	to_delete[tag][field_position_local][::-1]:
	# Delete subfields in reverse order (to keep the
	# indexing correct).
	record_delete_subfield_from(record, tag,
	int(subfield_position),
	field_position_local=int(field_position_local))
	deleted_subfields += 1
	if deleted_fields == 1 and deleted_subfields == 0:
	response['resultCode'] = 26
	elif deleted_fields and deleted_subfields == 0:
	response['resultCode'] = 27
	elif deleted_subfields == 1 and deleted_fields == 0:
	response['resultCode'] = 28
	elif deleted_subfields and deleted_fields == 0:
	response['resultCode'] = 29
	else:
	response['resultCode'] = 30
	response['cacheMTime'], response['cacheDirty'] = \
	update_cache_file_contents(recid, uid, record_revision,
	record, \
	pending_changes, \
	deactivated_hp_changes, \
	undo_list, redo_list), \
	True

	return response

	def perform_request_autocomplete(request_type, recid, uid, data):
	"""
	Perfrom an AJAX request associated with the retrieval of autocomplete
	data.

	Arguments:
	request_type: Type of the currently served request
	recid: the identifer of the record
	uid: The identifier of the user being currently logged in
	data: The request data containing possibly important additional
	arguments
	"""
	response = {}
	# get the values based on which one needs to search
	searchby = data['value']
	#we check if the data is properly defined
	fulltag = ''
	if data.has_key('maintag') and data.has_key('subtag1') and \
	data.has_key('subtag2') and data.has_key('subfieldcode'):
	maintag = data['maintag']
	subtag1 = data['subtag1']
	subtag2 = data['subtag2']
	u_subtag1 = subtag1
	u_subtag2 = subtag2
	if (not subtag1) or (subtag1 == ' '):
	u_subtag1 = '_'
	if (not subtag2) or (subtag2 == ' '):
	u_subtag2 = '_'
	subfieldcode = data['subfieldcode']
	fulltag = maintag+u_subtag1+u_subtag2+subfieldcode
	if (request_type == 'autokeyword'):
	#call the keyword-form-ontology function
	if fulltag and searchby:
	items = get_kbt_items_for_bibedit(CFG_BIBEDIT_KEYWORD_TAXONOMY, \
	CFG_BIBEDIT_KEYWORD_RDFLABEL, \
	searchby)
	response['autokeyword'] = items
	if (request_type == 'autosuggest'):
	#call knowledge base function to put the suggestions in an array..
	if fulltag and searchby and len(searchby) > 3:
	suggest_values = get_kbd_values_for_bibedit(fulltag, "", searchby)
	#remove ..
	new_suggest_vals = []
	for sugg in suggest_values:
	if sugg.startswith(searchby):
	new_suggest_vals.append(sugg)
	response['autosuggest'] = new_suggest_vals
	if (request_type == 'autocomplete'):
	#call the values function with the correct kb_name
	if CFG_BIBEDIT_AUTOCOMPLETE_TAGS_KBS.has_key(fulltag):
	kbname = CFG_BIBEDIT_AUTOCOMPLETE_TAGS_KBS[fulltag]
	#check if the seachby field has semicolons. Take all
	#the semicolon-separated items..
	items = []
	vals = []
	if searchby:
	if searchby.rfind(';'):
	items = searchby.split(';')
	else:
	items = [searchby.strip()]
	for item in items:
	item = item.strip()
	kbrvals = get_kbr_values(kbname, item, '', 'e') #we want an exact match
	if kbrvals and kbrvals[0]: #add the found val into vals
	vals.append(kbrvals[0])
	#check that the values are not already contained in other
	#instances of this field
	record = get_cache_file_contents(recid, uid)[2]
	xml_rec = print_rec(record)
	record, status_code, dummy_errors = create_record(xml_rec)
	existing_values = []
	if (status_code != 0):
	existing_values = record_get_field_values(record,
	maintag,
	subtag1,
	subtag2,
	subfieldcode)
	#get the new values.. i.e. vals not in existing
	new_vals = vals
	for val in new_vals:
	if val in existing_values:
	new_vals.remove(val)
	response['autocomplete'] = new_vals
	response['resultCode'] = CFG_BIBEDIT_AJAX_RESULT_CODES_REV['autosuggestion_scanned']
	return response

	def perform_request_bibcatalog(request_type, recid, uid):
	"""Handle request to BibCatalog (RT).

	"""
	response = {}

	if request_type == 'getTickets':
	# Insert the ticket data in the response, if possible
	if uid:
	bibcat_resp = bibcatalog_system.check_system(uid)
	if bibcat_resp == "":
	tickets_found = bibcatalog_system.ticket_search(uid, \
	status=['new', 'open'], recordid=recid)
	t_url_str = '' #put ticket urls here, formatted for HTML display
	for t_id in tickets_found:

	#t_url = bibcatalog_system.ticket_get_attribute(uid, \
	# t_id, 'url_display')
	ticket_info = bibcatalog_system.ticket_get_info( \
	uid, t_id, ['url_display', 'url_close'])
	t_url = ticket_info['url_display']
	t_close_url = ticket_info['url_close']
	#format..
	t_url_str += "#" + str(t_id) + '<a href="' + t_url + \
	'">[read]</a> <a href="' + t_close_url + \
	'">[close]</a><br/>'
	#put ticket header and tickets links in the box
	t_url_str = "<strong>Tickets</strong><br/>" + t_url_str + \
	"<br/>" + '<a href="new_ticket?recid=' + str(recid) + \
	'>[new ticket]</a>'
	response['tickets'] = t_url_str
	#add a new ticket link
	else:
	#put something in the tickets container, for debug
	response['tickets'] = "<!--"+bibcat_resp+"-->"
	response['resultCode'] = 31

	return response

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