updated ACF Image Support

src/ACF/Image.php

@@ -0,0 +1,61 @@
+<?php # -*- coding: utf-8 -*-
+
+namespace MultisiteGlobalMedia\ACF;
+
+use MultisiteGlobalMedia\Helper;
+use MultisiteGlobalMedia\SingleSwitcher;
+use MultisiteGlobalMedia\Site;
+
+class Image
+{
+
+    use Helper;
+
+    /**
+     * @var Site
+     */
+    private $site;
+
+    /**
+     * @var SingleSwitcher
+     */
+    private $siteSwitcher;
+
+    /**
+     * @var \ACF_Data
+     */
+    private $store;
+
+    /**
+     * Image constructor
+     *
+     * @param Site $site
+     * @param SingleSwitcher $siteSwitcher
+     */
+    public function __construct(Site $site, SingleSwitcher $siteSwitcher)
+    {
+        $this->site = $site;
+        $this->siteSwitcher = $siteSwitcher;
+        $this->store = acf_get_store('values');
+    }
+
+    // Fetch ACF file fields across sites when the global prefix is used.
+    // We hook into 'load_value' which usually runs just before 'format_value'.
+    // Then get the formatted output of the field in the global media site's context,
+    // and store it in ACF's cache. So when format_value tries to use this value,
+    // it will find the formatted one already in the cache.
+    // This works around acf_format_value requiring a valid att ID as input, but
+    // returning a string/array as output, so it can't be easily filtered.
+    public function acfLoadValue($value, $post_id, $field)
+    {
+        if ($this->idPrefixIncludedInAttachmentId((int)$value, $this->site->idSitePrefix())) {
+            $formatted = $this->stripSiteIdPrefixFromAttachmentId($this->site->idSitePrefix(), $value);
+            $this->siteSwitcher->switchToBlog($this->site->id());
+            $formatted = acf_format_value($formatted, $post_id, $field);
+            $this->siteSwitcher->restoreBlog();
+            $this->store->set("$post_id:{$field['name']}:formatted", $formatted);
+        }
+        // This filter doesn't modify the loaded value. Return it as-is.
+        return $value;
+    }
+}

src/Plugin.php

@@ -60,9 +60,12 @@ public function onLoad()
         add_filter('register_post_type_args', [$rest, 'registerPostTypeArgs'], 10, 2);
         add_filter('rest_request_after_callbacks', [$rest, 'restRequestAfterCallbacks'], 10, 3);
 
+
         if (\function_exists('wc')) {
             $this->wcBootstrap($site, $singleSwitcher);
         }
+
+        $this->acfBootstrap($site, $singleSwitcher);
     }
 
     /**
@@ -78,4 +81,22 @@ public function wcBootstrap(Site $site, SingleSwitcher $siteSwitcher)
         add_action('woocommerce_new_product', [$wooCommerceGallery, 'saveGalleryIds']);
         add_action('woocommerce_update_product', [$wooCommerceGallery, 'saveGalleryIds']);
     }
+
+    /**
+     * Integration for ACF, specifically Image fields
+     *
+     * @param Site $site
+     * @param SingleSwitcher $siteSwitcher
+     */
+    public function acfBootstrap(Site $site, SingleSwitcher $siteSwitcher)
+    {
+        // ACF can be included within a theme too - check in after_setup_theme action
+        // https://www.advancedcustomfields.com/resources/including-acf-within-a-plugin-or-theme/
+        add_action('after_setup_theme', function () use ($site, $siteSwitcher) {
+            if (\function_exists('get_field')) {
+                $acfImage = new ACF\Image($site, $siteSwitcher);
+                add_filter('acf/load_value/type=image', array($acfImage, 'acfLoadValue'), 10, 3);
+            }
+        });
+    }
 }