Added image retrieval from OPS API. Needs work.

config.env.template

 # OPS API variables
 # Hostname for OPS API, usually https://ops.epo.org
 OPS_URL=
+# Hostname for OPS API for images, for some reason different to above
+OPS_URL_IMAGES=
 # API credentials from OPS https://developers.epo.org/
 CONSUMER_KEY=
 CONSUMER_SECRET=

site/ops_api.php

   $access_token = get_access_token();
 
   // OPS API credentials (details at http://documents.epo.org/projects/babylon/eponet.nsf/0/F3ECDCC915C9BCD8C1258060003AA712/$File/ops_v3.2_documentation_-_version_1.3.16_en.pdf)
-  $ops_url = $_ENV["OPS_URL"] . 'rest-services/published-data/publication/epodoc/' . $document_reference . '/biblio';
+  $ops_url = $_ENV["OPS_URL"] . 'rest-services/published-data/publication/epodoc/' . $document_reference . '/biblio,full-cycle';
 
   // Set up API call
   $ch = curl_init();
   curl_close($ch);
 
   if (strpos($response,"No results found") === false ) {
+    $xml = new SimpleXMLElement($response);
     print_r($response);
   }
 
 }
 
+function get_images($document_reference) {
+
+  $access_token = get_access_token();
+
+  // OPS API credentials (details at http://documents.epo.org/projects/babylon/eponet.nsf/0/F3ECDCC915C9BCD8C1258060003AA712/$File/ops_v3.2_documentation_-_version_1.3.16_en.pdf)
+  $ops_url = $_ENV["OPS_URL"] . 'rest-services/published-data/publication/epodoc/' . $document_reference . '/images';
+
+  // Set up API call
+  $ch = curl_init();
+  curl_setopt($ch, CURLOPT_URL, $ops_url);
+  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+  curl_setopt($ch, CURLOPT_HTTPHEADER, array("Authorization: Bearer $access_token"));
+
+  // Give back curl result
+  $response = curl_exec($ch);
+  curl_close($ch);
+
+  if (strpos($response,"No results found") === false ) {
+
+		// Turn the API response into useful XML
+		$xml = new SimpleXMLElement($response);
+
+    // Retrieve image path from that XML
+    $drawings_url = $_ENV["OPS_URL_IMAGES"] . '3.2/rest-services/' . $xml->xpath("///ops:document-instance[@desc='Drawing']/@link")[0][0]->__toString() . '?Range=1';
+
+    // Set up API call
+    $ch = curl_init();
+    curl_setopt($ch, CURLOPT_URL, $drawings_url);
+    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+    curl_setopt($ch, CURLOPT_HTTPHEADER, array("Authorization: Bearer $access_token"));
+
+    // Give back curl result
+    $response = curl_exec($ch);
+    curl_close($ch);
+
+    //Display the image in the browser
+    header('Content-type: image/jpeg');
+    echo $response;
+
+  }
+
+}
+
 ?>

site/public/index.php

 
 <br><br>
 
+<?php
+
+  if ($random_record['abstract']):
+
+?>
+
 Abstract:
 
 <?php
 
 <br><br>
 
+<?
+  endif;
+?>
+
 <?php
 
   if (get_publication_details($random_record['doc_ref'])):
 <?php
   endif;
 ?>
+
+<?php
+
+  //if (get_images($random_record['doc_ref'])):
+
+?>
+
+<!-- TO DO: RESOLVE WHY NGINX DOESN'T DISPLAY ANY OTHER PAGES IN THE PUBLIC DIRECTORY INCLUDING THESE TWO-->
+
+<a href="./ops_image.php?doc_ref=<?php echo $random_record['doc_ref'] ?>">Click here for image</a>
+
+<a href="./test.php">click</a>
+
+<br><br>
+
+<?php
+  //endif;
+?>

site/public/ops_image.php

+<?php
+
+# @name: ops_image.php
+# @version: 0.1
+# @creation_date: 2021-09-24
+# @license: The MIT License <https://opensource.org/licenses/MIT>
+# @author: Simon Bowie <ad7588@coventry.ac.uk>
+# @purpose: Display images from OPS API image service
+# @acknowledgements:
+# OPS documented at https://www.epo.org/searching-for-patents/data/web-services/ops.html
+# OPS RESTful API specification at http://documents.epo.org/projects/babylon/eponet.nsf/0/F3ECDCC915C9BCD8C1258060003AA712/$File/ops_v3.2_documentation_-_version_1.3.16_en.pdf
+# OPS API functions list at https://developers.epo.org/ops-v3-2/apis
+
+include '../ops_api.php';
+
+if(isset($_GET["doc_ref"])){
+
+  $access_token = get_access_token();
+
+  // OPS API credentials (details at http://documents.epo.org/projects/babylon/eponet.nsf/0/F3ECDCC915C9BCD8C1258060003AA712/$File/ops_v3.2_documentation_-_version_1.3.16_en.pdf)
+  $ops_url = $_ENV["OPS_URL"] . 'rest-services/published-data/publication/epodoc/' . $document_reference . '/images';
+
+  // Set up API call
+  $ch = curl_init();
+  curl_setopt($ch, CURLOPT_URL, $ops_url);
+  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+  curl_setopt($ch, CURLOPT_HTTPHEADER, array("Authorization: Bearer $access_token"));
+
+  // Give back curl result
+  $response = curl_exec($ch);
+  curl_close($ch);
+
+  if (strpos($response,"No results found") === false ) {
+
+		// Turn the API response into useful XML
+		$xml = new SimpleXMLElement($response);
+
+    // Retrieve image path from that XML
+    $drawings_url = $_ENV["OPS_URL_IMAGES"] . '3.2/rest-services/' . $xml->xpath("///ops:document-instance[@desc='Drawing']/@link")[0][0]->__toString() . '?Range=1';
+
+    // Set up API call
+    $ch = curl_init();
+    curl_setopt($ch, CURLOPT_URL, $drawings_url);
+    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+    curl_setopt($ch, CURLOPT_HTTPHEADER, array("Authorization: Bearer $access_token"));
+
+    // Give back curl result
+    $response = curl_exec($ch);
+    curl_close($ch);
+
+    //Display the image in the browser
+    header('Content-type: image/jpeg');
+    echo $response;
+
+  }
+
+}
+
+?>