Add check for mjwshared extension

CRM/Core/Payment/Stripe.php

@@ -318,12 +318,12 @@ class CRM_Core_Payment_Stripe extends CRM_Core_Payment {
       'publishableKey' => CRM_Core_Payment_Stripe::getPublicKeyById($form->_paymentProcessor['id']),
       'jsDebug' => TRUE,
     ];
-    CRM_Core_Resources::singleton()->addVars(E::SHORT_NAME, $jsVars);
+    \Civi::resources()->addVars(E::SHORT_NAME, $jsVars);
 
     // Add help and javascript
     CRM_Core_Region::instance('billing-block')->add(
       ['template' => 'CRM/Core/Payment/Stripe/Card.tpl', 'weight' => -1]);
-    CRM_Core_Resources::singleton()
+    \Civi::resources()
       ->addStyleFile(E::LONG_NAME, 'css/elements.css', 0, 'page-header')
       ->addScriptFile('com.drastikbydesign.stripe', 'js/civicrm_stripe.js');
   }

CRM/Stripe/Check.php

+<?php
+
+/**
+ * https://civicrm.org/licensing
+ */
+
+use CRM_Stripe_ExtensionUtil as E;
+
+/**
+ * Class CRM_Stripe_Check
+ */
+class CRM_Stripe_Check {
+
+  const MIN_VERSION_MJWSHARED = 0.2;
+
+  public static function checkRequirements(&$messages) {
+    $extensions = civicrm_api3('Extension', 'get', [
+      'full_name' => "mjwshared",
+    ]);
+
+    if (empty($extensions['id']) || ($extensions['values'][$extensions['id']]['status'] !== 'installed')) {
+      $messages[] = new CRM_Utils_Check_Message(
+        'stripe_requirements',
+        E::ts('The Stripe extension requires the mjwshared extension which is not installed (https://lab.civicrm.org/extensions/mjwshared).'),
+        E::ts('Stripe: Missing Requirements'),
+        \Psr\Log\LogLevel::ERROR,
+        'fa-money'
+      );
+    }
+
+    if (version_compare($extensions['values'][$extensions['id']]['version'], self::MIN_VERSION_MJWSHARED) === -1) {
+      $messages[] = new CRM_Utils_Check_Message(
+        'stripe_requirements',
+        E::ts('The Stripe extension requires the mjwshared extension version %1 or greater but your system has version %2.',
+          [
+            1 => self::MIN_VERSION_MJWSHARED,
+            2 => $extensions['values'][$extensions['id']]['version']
+          ]),
+        E::ts('Stripe: Missing Requirements'),
+        \Psr\Log\LogLevel::ERROR,
+        'fa-money'
+      );
+    }
+  }
+
+}

docs/release/release_notes.md

 ## Release 6.0 (not yet released)
 
-* Stripe API Version: 2019-08-14
-* Switch publishable key/secret key in settings (upgrader does this automatically) so they are now "correct" per CiviCRM settings pages.
+**This is a major new release. You cannot rollback once you've upgraded.**
 
+* Use Stripe Elements: https://stripe.com/payments/elements.
+* Use PaymentIntents and comply with the European SCA directive (https://stripe.com/docs/strong-customer-authentication).
+* Require Stripe API Version: 2019-08-14 and ensure that all codepaths specify the API version.
+* Switch publishable key/secret key in settings (upgrader does this automatically) so they are now "correct" per CiviCRM settings pages.
 
 ## Release 5.4.1
 * Don't overwrite system messages when performing webhook checks.

js/civicrm_stripe.js

@@ -92,6 +92,7 @@ CRM.$(function($) {
   $(document).ready(function() {
     // Disable the browser "Leave Page Alert" which is triggered because we mess with the form submit function.
     window.onbeforeunload = null;
+
     // Load Stripe onto the form.
     loadStripeBillingBlock();
 

stripe.php

@@ -160,7 +160,7 @@ function stripe_civicrm_buildForm($formName, &$form) {
 
   // Load stripe.js on all civi forms per stripe requirements
   if (!isset(\Civi::$statics[E::LONG_NAME]['stripeJSLoaded'])) {
-    CRM_Core_Resources::singleton()->addScriptUrl('https://js.stripe.com/v3');
+    \Civi::resources()->addScriptUrl('https://js.stripe.com/v3');
     \Civi::$statics[E::LONG_NAME]['stripeJSLoaded'] = TRUE;
   }
 }
@@ -194,6 +194,7 @@ function stripe_civicrm_postProcess($formName, &$form) {
  */
 function stripe_civicrm_check(&$messages) {
   CRM_Stripe_Webhook::check($messages);
+  CRM_Stripe_Check::checkRequirements($messages);
 }
 
 /**