Add billing address autocomplete functionality to module

src/Model/AutocompleteConfigProvider.php

@@ -62,7 +62,8 @@ public function getConfig()
             'active'        => $this->helper->getConfigValue('shipping/shipper_autocomplete/active'),
             'api_key'  =>    $this->helper->getConfigValue('shipping/shipper_autocomplete/google_api_key'),
             'use_geolocation'  =>    $this->helper->getConfigValue('shipping/shipper_autocomplete/use_geolocation'),
-            'use_long_postcode'  =>    $this->helper->getConfigValue('shipping/shipper_autocomplete/use_long_postcode')
+            'use_long_postcode'  =>    $this->helper->getConfigValue('shipping/shipper_autocomplete/use_long_postcode'),
+            'billing_autocomplete' => $this->helper->getConfigValue('shipping/shipper_autocomplete/autocomplete_billing_address')
         ];
         return $config;
     }

src/Plugin/AddCheckoutBillingAddressAutocomplete.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace ShipperHQ\AddressAutocomplete\Plugin;
+
+use Magento\Checkout\Block\Checkout\LayoutProcessor;
+use Magento\Checkout\Helper\Data as CheckoutHelper;
+
+class AddCheckoutBillingAddressAutocomplete
+{
+    /**
+     * @var CheckoutHelper
+     */
+    private $checkoutHelper;
+
+    /**
+     * @param CheckoutHelper $checkoutHelper
+     */
+    public function __construct(
+        CheckoutHelper $checkoutHelper
+    ) {
+        $this->checkoutHelper = $checkoutHelper;
+    }
+
+    /**
+     * Adds the billing address autocomplete component to the billing address forms in checkout
+     *
+     * @see LayoutProcessor::process()
+     * @param LayoutProcessor $subject
+     * @param array $jsLayout
+     * @return array
+     * @SuppressWarnings(PHPMD.UnusedLocalVariable)
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function afterProcess(LayoutProcessor $subject, $jsLayout)
+    {
+        if (!isset(
+            $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
+            ['payment']['children']
+        )) {
+            return $jsLayout;
+        }
+
+        if ($this->checkoutHelper->isDisplayBillingOnPaymentMethodAvailable()) {
+            $configuration = &$jsLayout['components']['checkout']['children']['steps']['children']['billing-step']
+            ['children']['payment']['children']['payments-list']['children'];
+
+            foreach ($configuration as $paymentFormCode => $formConfiguration) {
+                if (strpos($paymentFormCode, '-form') !== false) {
+                    $paymentCode = str_replace('-form', '', $paymentFormCode);
+                    $configuration[$paymentFormCode]['children']
+                    [$paymentCode . '-billing-address-autocomplete'] = $this->getBillingAddressAutocompleteComponent(
+                        $paymentCode
+                    );
+                }
+            }
+        } else {
+            $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']
+            ['children']['payment']['children']['afterMethods']['children']['billing-address-form']['children']
+            ['shared-billing-address-autocomplete'] = $this->getBillingAddressAutocompleteComponent(
+                'shared'
+            );
+        }
+
+        return $jsLayout;
+    }
+
+    /**
+     * Returns that component configuration to be used in the checkout
+     *
+     * @param string $paymentCode
+     * @return array
+     */
+    private function getBillingAddressAutocompleteComponent($paymentCode)
+    {
+        return [
+            'component' => 'ShipperHQ_AddressAutocomplete/js/billing-address-autocomplete',
+            'config' => [
+                'paymentCode' => $paymentCode
+            ]
+        ];
+    }
+}

src/etc/adminhtml/system.xml

@@ -79,6 +79,13 @@
                         ]]>
                     </comment>
                 </field>
+                <field id="autocomplete_billing_address" type="select" translate="label" sortOrder="140" showInDefault="1" showInWebsite="1" showInStore="1">
+                    <label>Autocomplete Billing Address</label>
+                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
+                    <comment>
+                        <![CDATA[Enabling this will allow autocomplete on the billing address field.]]>
+                    </comment>
+                </field>
             </group>
         </section>
     </system>

src/etc/config.xml

@@ -39,6 +39,7 @@
             <shipper_autocomplete>
                 <use_geolocation>1</use_geolocation>
                 <use_long_postcode>0</use_long_postcode>
+                <autocomplete_billing_address>0</autocomplete_billing_address>
             </shipper_autocomplete>
         </shipping>
     </default>

src/etc/frontend/di.xml

@@ -17,4 +17,8 @@
             </argument>
         </arguments>
     </type>
+
+    <type name="Magento\Checkout\Block\Checkout\LayoutProcessor">
+        <plugin name="addCheckoutBillingAddressAutocomplete" type="ShipperHQ\AddressAutocomplete\Plugin\AddCheckoutBillingAddressAutocomplete" />
+    </type>
 </config>