initial commit

src/Plugin/Block/ReserveBlock.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace Drupal\upei_roblib_reserves\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+
+/**
+ * Provides a Reserves Block base on Evergreen bookbags.
+ *
+ * @Block(
+ *   id = "upei_roblib_reserves_block",
+ *   admin_label = @Translation("Roblib Reserves Block"),
+ *   category = @Translation("UPEI Roblib"),
+ * )
+ */
+class ReserveBlock extends BlockBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    $html = $this->getReserves();
+    if (empty($html)) {
+      return '';
+    }
+
+    return [
+      '#theme' => 'upei_roblib_reserves_block',
+      '#atom_to_html' => [
+        '#markup' => $html,
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheMaxAge() {
+    //Reading dynamic content from external source so no caching.
+    return 0;
+  }
+
+  /**
+   * Queries Evergreen for an Atom XML feed based on book bag list.
+   * 
+   * @return string
+   *   HTML created from Atom XML feed.
+   */
+  protected function getReserves() {
+    $node = \Drupal::routeMatch()->getParameter('node');
+
+    $html = '';
+    if ($node && $node instanceof \Drupal\node\NodeInterface && $node->bundle() == 'course_reserve') {
+      $book_bag_id = (string) $node->field_bookbag_id->value;
+      if (empty($book_bag_id)) {
+        return '';
+      }
+      //The evergreen ILS base URL.
+      $book_bag_base_url = 'http://islandpines.roblib.upei.ca/opac/extras/feed/bookbag/atom-full/';
+      try {
+        $response = \Drupal::httpClient()->get($book_bag_base_url . $book_bag_id);
+        $atom = (string) $response->getBody();
+        if (empty($atom)) {
+          return '';
+        }
+      }
+      catch (RequestException $e) {
+        return '';
+      }
+      $path = \Drupal::service('extension.list.module')->getPath('upei_roblib_reserves');
+      $xslt = new \XSLTProcessor();
+      $xsl = new \DOMDocument();
+      $xsl->load($path . '/xsl/atom2html.xsl');
+      $xslt->importStylesheet($xsl);
+      $xml = new \DomDocument();
+      $xml->loadXML($atom);
+      $html = $xslt->transformToXML($xml);
+    }
+    return $html;
+  }
+
+}

templates/upei-roblib-reserves-block.html.twig

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+
+{% if atom_to_html %} 
+    <h3>Materials Available from the Service Desk</h3>
+    <div class="upei-roblib-reserves">{{ atom_to_html }}</div>
+{% endif %}

upei_roblib_reserves.info.yml

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+name: UPEI Robertson Library Reserves Module
+type: module
+core_version_requirement: ^9 || ^10
+description: A module to consume a bookbag from evergreen and display the results in Drupal

upei_roblib_reserves.module

@@ -0,0 +1,14 @@
+<?php
+
+/**
+ * Implements hook_theme().
+ */
+function upei_roblib_reserves_theme($existing, $type, $theme, $path): array {
+  return [
+    'upei_roblib_reserves_block' => [
+      'variables' => [
+        'atom_to_html' => NULL,
+      ],
+    ],
+  ];
+}

xsl/atom2html.xsl

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+
+<xsl:stylesheet
+        version="1.0"
+        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+        xmlns:atom="http://www.w3.org/2005/Atom"
+        xmlns:v1="http://open-ils.org/spec/holdings/v1"
+        exclude-result-prefixes="atom v1"
+        >
+    <xsl:output encoding="utf-8" indent="yes" method="html"/>
+    <xsl:variable name="opac_link"
+                  select="/atom:feed/atom:entry/atom:link[@rel='opac']"/>
+    <xsl:template match="/">
+            <xsl:apply-templates select="atom:feed/atom:entry"/>
+    </xsl:template>
+
+    <xsl:template match="atom:entry">
+        <xsl:for-each select=".">
+            <div class="atom-entry">
+                <div class="atom-title">
+                    <a>
+                        <xsl:attribute name='href'>
+                            <xsl:value-of
+                                    select="atom:link[@rel='opac']/@href"/>
+                        </xsl:attribute>
+                        <xsl:value-of select="atom:title"/>
+                    </a>
+                </div>
+                <div class="atom-publication-date">
+                    Publication date:
+                    <xsl:value-of select="atom:published"/>
+                </div>
+                <div class="atom-author">Authors:
+                    <ul class="atom-list">
+                        <xsl:for-each select="atom:author/atom:name">
+                            <li class="atom-list-item">
+                                <xsl:value-of select="."/>
+                            </li>
+                        </xsl:for-each>
+                    </ul>
+                </div>
+                <div class="atom-holdings">Holdings:
+                    <ul class="atom-list">
+                        <xsl:for-each select="v1:holdings/v1:volumes/v1:volume/v1:copies/v1:copy">
+                            <li class="atom-available">
+                                <xsl:value-of select="v1:location"/><xsl:text> </xsl:text>
+                                (<xsl:value-of select="v1:status"/>)
+                            </li>
+
+                        </xsl:for-each>
+                    </ul>
+                </div>
+            </div>
+            <br/>
+        </xsl:for-each>
+    </xsl:template>
+</xsl:stylesheet>