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Finna-JOKA-images / collect-joka.py

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	#!/usr/bin/env python

	from finna_client import FinnaClient, IMAGE_BASE
	import requests
	import json
	import os
	import os.path
	import logging

	finna = FinnaClient()
	logging.basicConfig(format='%(asctime)s - %(message)s', level=logging.INFO)

	MAX_YEAR = 1940 # retrieve only images older than this (inclusive)
	IMAGE_DIR = 'images'

	# Facet filters that define the set of images we want to
	FILTERS = [
	'~format_ext_str_mv:"0/Image/"', # Images
	'~building:"0/Museovirasto/"', # from Museovirasto (Finnish Heritage Agency)
	'~hierarchy_parent_title:"JOKA Journalistinen kuva-arkisto"', # JOKA archive
	'~usage_rights_ext_str_mv:"0/B BY/"', # CC By license
	f'search_daterange_mv:"overlap\|[* TO {MAX_YEAR}]"', # date up to MAX_YEAR
	]

	# Fields to include in the metadata records
	FIELDS = [
	'formats',
	'id',
	'imageRights',
	'images',
	'languages',
	'nonPresenterAuthors',
	'onlineUrls',
	'presenters',
	'rating',
	'series',
	'subjects',
	'title',
	'year',
	'rawData',
	]

	def download_url_to_file(url, filename):
	if os.path.exists(filename) and os.stat(filename).st_size > 0:
	return # file already exists, no need to re-download
	with requests.get(url, stream=True) as r:
	r.raise_for_status()
	with open(filename, 'wb') as f:
	for chunk in r.iter_content(chunk_size=8192):
	f.write(chunk)

	with open('metadata.jsonl', 'w') as outfile:
	page = 1

	while True:
	logging.info(f'Loading result page {page}')
	result = finna.search(filters=FILTERS, fields=FIELDS, page=page)
	if 'records' not in result:
	logging.info('No more records, stopping.')
	break
	logging.debug(f'Got {len(result["records"])} records')
	for record in result['records']:
	image_url = IMAGE_BASE + record['images'][0]
	image_file_out = os.path.join(IMAGE_DIR, record['id'] + '.jpg')
	download_url_to_file(image_url, image_file_out)
	record['file_name'] = image_file_out
	json.dump(record, outfile)
	print("", file=outfile)
	page += 1