Islandora/Fedora requirements

• Islandora openseadragon starting from “Commits on Jul 26, 2017”

• Openseadragon 2.2.1

• Apache reverse proxy on front-end (Islandora)

a2enmod headers
service apache2 restart

nano -w /etc/apache2/sites-enabled/archive.digibess.eu.conf


        AllowEncodedSlashes On
        ProxyRequests Off
        ProxyPreserveHost On
        <Proxy *>
                Order deny,allow
                Allow from all
        </Proxy>

+        RequestHeader set X-Forwarded-Path /iiif-server
+        ProxyPass /iiif-server http://123.123.123.123:8182 nocanon
+        ProxyPassReverse /iiif-server http://123.123.123.123:8182

• Islandora viewers Openseadragon settings (admin/islandora/islandora_viewers/openseadragon)

Image Server = IIIF Image server

IIIF Image Server Base URL = http://archive.digibess.eu/iiif-server/iiif/2

• Fedora policy update [not sure we need this]

If yuo plan to redirect Tile source URL from front-end to directly back-end, you need to add Image Server IP to /usr/local/fedora/data/fedora-xacml-policies/repository-policies/default/deny-apim-if-not-localhost.xml

• Redirect Openseadragon tile source to fedora

By default tile source point to front-end server to download JP2. In some case pointing directly to fedora may result in better performance.
To modify how this works you can add to your theme template.php this function to override tile source URL for islandora openseadragon (Many thanks Nigel!!):

function beginning_preprocess_islandora_openseadragon_viewer(array &$variables) {
  module_load_include('inc', 'islandora_openseadragon', 'includes/utilities');
  $pid =  $variables['settings']['pid'];
  $matches = array();
  preg_match('/datastream%2[fF](.*)%2[fF]view/', $variables['settings']['options']['tileSources'][0], $matches);
  $dsid = isset($matches[1]) ? $matches[1] : NULL;
  $identifier = "http://FEDORA_IP_or_FQDN:8080/fedora/objects/".$pid."/datastreams/".$dsid."/content";
  $variables['settings']['options']['tileSources'] = islandora_openseadragon_identifier_tile_source($identifier);
}

This function replaces tile source URL and remove token, so IIIF server download directly from fedora avoiding network loop with front-end.

NOTE: UPGRADE to CANTALOUPE 3.4

• remove function to override tile source URL for islandora openseadragon from your theme template.php
• openseadragon >= 2.3.1 (wget https://github.com/openseadragon/openseadragon/releases/download/v2.3.1/openseadragon-bin-2.3.1.tar.gz)
• drupal module token (drush -v -u 1 dl token / drush -v -u 1 en token)
• islandora_openseadragon HEAD or from commit cfb005b Nov 20, 2017
• configure islandora openseadragon new options (i.e. Add token as header:NO ; IIIF Identifier: http://repo.digibess.eu/fedora/objects/[islandora_openseadragon:pid]/datastreams/[islandora_openseadragon:dsid]/content)