Generate IIIF proxy mapfile

derrida-290.py

# goal is to map from
# /library/levi-strauss-anthropologie-structurale-1958/gallery/images/front-cover/iiif/
# ..to..
# https://iiif-cloud.princeton.edu/iiif/2/ee%2F09ce512bce02%2Fintermediate_file

import json
from django.urls import reverse
from derrida.books.models import Instance
from derrida.common.utils import absolutize_url

def localize_iiif_image(canvas, work_instance):
    # given a djiffy canvas and associated work,
    # # use the piffle image api client for the canvas image and
    # replace original iiif api endpoint and image id with local proxy iiif url
    img = canvas.image
    img.api_endpoint = absolutize_url(
        reverse('books:canvas-detail',
                 kwargs={'slug': work_instance.slug,
                         'short_id': 'images'})).rstrip('/')
    img.image_id = '%s/iiif' % canvas.short_id
    return img


def parse_pul_image_url(url_string):
    return url_string.split('/info.json')[0]

def parse_local_image_url(url_string):
    return url_string.split('https://derridas-margins.princeton.edu')[1].split('full/full/0/default.jpg')[0]

all_instances = Instance.objects.filter(digital_edition__isnull=False)

mapping = {}

for instance in all_instances:
    instance_canvases = []
    instance_canvases.extend(instance.overview_images())
    instance_canvases.extend(instance.annotated_pages())
    instance_canvases.extend(instance.insertion_images())
    for canvas in instance_canvases:
        local_image_url = str(localize_iiif_image(canvas, instance))
        local_image_url = parse_local_image_url(local_image_url)
        pul_image_url = canvas.image.info()
        pul_image_url = parse_pul_image_url(pul_image_url)
        mapping[local_image_url] = pul_image_url

with open('iiif-proxy.map', 'w') as f:
    for local_image_url, pul_image_url in mapping.items():
        f.write(f"{local_image_url} {pul_image_url};\n")