Return custom product metadata with products for shopkeeper over API.

Author: judgej

wc-api-custom-meta.php

@@ -3,7 +3,7 @@
 Plugin Name: WC API Custom Metafields
 Plugin URI:  https://github.com/academe/TBC
 Description: Allows custom meta fields to be added to products when creating or updating.
-Version:     0.5
+Version:     0.5.1
 Author:      Jason Judge
 Author URI:  http://academe.co.uk
 */
@@ -37,3 +37,67 @@ function academe_wc_api_custom_meta($id, $data) {
     }
 }
 
+
+// GET product through the API
+add_filter('woocommerce_api_product_response', 'academe_wc_api_get_meta', 10, 4);
+
+function academe_wc_api_get_meta($product_data, $product, $fields, $server) {
+    // The admin and shop manager will have the capability "manage_woocommerce".
+    // We only want users with this capability to see additional product meta fields.
+
+    if (current_user_can('manage_woocommerce')) {
+        $product_id = $product->id;
+
+        // Meta fields we don't want, due to them being already in the data.
+        $exclude = array(
+            // A few WP internal fields should not be exposed.
+            "_edit_lock",
+            "_edit_last",
+            // All these meta fields are already present in the product_data in some form.
+            "_visibility",
+            "_stock_status",
+            "total_sales",
+            "_downloadable",
+            "_virtual",
+            "_regular_price",
+            "_sale_price",
+            "_purchase_note",
+            "_featured",
+            "_weight",
+            "_length",
+            "_width",
+            "_height",
+            "_sku",
+            "_product_attributes",
+            "_price",
+            "_sold_individually",
+            "_manage_stock",
+            "_backorders",
+            "_stock",
+            "_upsell_ids",
+            "_crosssell_ids",
+            "_product_image_g
+            allery",
+            // The sale dates are actually not directly in the normal data returned.
+            "_sale_price_dates_from",
+            "_sale_price_dates_to",
+        );
+
+        $all_meta = get_post_meta($product_id);
+
+        // Filter out meta we don't want.
+        $all_meta = array_diff_key($all_meta, array_flip($exclude));
+
+        // Unserialize the meta field data where necessary.
+        foreach($all_meta as $key => &$value) {
+            $value = maybe_unserialize(reset($value));
+        }
+        unset($value);
+
+        $meta = array($all_meta);
+
+        $product_data['meta'] = $meta;
+    }
+
+    return $product_data;
+}