Website: Add support for promotional codes on the self-service license dispenser (#26280)

Changes:
- Added the ability to use coupons on the Fleet premium license
dispenser
- Updated the stripe webhook to support coupons on Fleet premium
subscriptions
- Updated the customer dashboard on the website to show decimal places
in subscription/host prices.

website/api/controllers/customers/get-stripe-checkout-session-url.js

@@ -54,6 +54,7 @@ module.exports = {
       ],
       mode: 'subscription',
       billing_address_collection: 'required',// eslint-disable-line camelcase
+      allow_promotion_codes: true,// eslint-disable-line camelcase
       tax_id_collection: {// eslint-disable-line camelcase
         enabled: true,
         required: 'if_supported'

website/api/controllers/webhooks/receive-from-stripe.js

@@ -103,7 +103,7 @@ module.exports = {
     // If stripe thinks this subscription renews in 7 days, we'll send the user an subscription reminder email.
     if(type === 'invoice.upcoming' && stripeEventData.billing_reason === 'upcoming') {
       // Get the subscription cost per host for the Subscription renewal notification email.
-      let subscriptionCostPerHost = Math.floor(subscriptionForThisEvent.subscriptionPrice / subscriptionForThisEvent.numberOfHosts / 12);
+      let subscriptionCostPerHost = (subscriptionForThisEvent.subscriptionPrice / subscriptionForThisEvent.numberOfHosts / 12).toFixed(2);
       let upcomingBillingAt = stripeEventData.next_payment_attempt * 1000;
       // Send a upcoming subscription renewal email.
       await sails.helpers.sendTemplateEmail.with({
@@ -188,6 +188,21 @@ module.exports = {
       // Get the updated number of hosts from the quantity of the invoice.
       let newNumberOfHosts = updatedSubscriptionInfo.quantity;
 
+      let subscriptionPrice = Math.floor(pricePerHost * newNumberOfHosts);
+
+      // (Optionally) adjust the price of this subscription if a coupon was applied.
+      if(stripeEventData.discount){
+        if(stripeEventData.discount.coupon){
+          if(stripeEventData.discount.coupon.amount_off){
+            // If the coupon applied takes a fixed dollar amount off of the total price, subtact the amoutn fro mthe subscriptionPrice
+            subscriptionPrice = _.round(subscriptionPrice - (stripeEventData.discount.coupon.amount_off / 100), 2); // Note: coupon.amount_off contains the discounted amount in cents.
+          } else if(stripeEventData.discount.coupon.percent_off){
+            // Otherwise if it is a percent discount,
+            let discountAmount = subscriptionPrice * (stripeEventData.discount.coupon.percent_off / 100);
+            subscriptionPrice = _.round(subscriptionPrice - discountAmount, 2);
+          }
+        }
+      }
       // Generate a new license key for this subscription
       let newLicenseKeyForThisSubscription = await sails.helpers.createLicenseKey.with({
         numberOfHosts: newNumberOfHosts,
@@ -198,7 +213,7 @@ module.exports = {
       // Update the subscription record
       await Subscription.updateOne({id: subscriptionForThisEvent.id}).set({
         numberOfHosts: newNumberOfHosts,
-        subscriptionPrice: Math.floor(pricePerHost * newNumberOfHosts),
+        subscriptionPrice,
         fleetLicenseKey: newLicenseKeyForThisSubscription,
         nextBillingAt: nextBillingAt
       });
@@ -214,10 +229,11 @@ module.exports = {
       let nextBillingAt = newSubscriptionDetails.current_period_end * 1000;
       // Get the number of Hosts.
       let numberOfHosts = newSubscriptionDetails.quantity;
-      // Get the whole dollar price per host.
+      // Get the whole dollar price per host by subtracting the discount amount from the plan amount.
+      // [?]: https://docs.stripe.com/api/checkout/sessions/object#checkout_session_object-total_details
       let subscriptionPricePerHost = newSubscriptionDetails.plan.amount / 100;
       // Determine the annual cost of this user's subscription
-      let subscriptionPrice = subscriptionPricePerHost * numberOfHosts;
+      let subscriptionPrice = (subscriptionPricePerHost * numberOfHosts) - (stripeEventData.total_details.amount_discount / 100);
       // Generate a new license key.
       let newLicenseKey = await sails.helpers.createLicenseKey.with({
         numberOfHosts,

website/views/pages/customers/dashboard.ejs

@@ -31,7 +31,7 @@
           </div>
           <div class="col-12 col-md-6 col-lg-2 pt-3 pt-md-0">
             <strong>Cost</strong>
-            <p>${{thisSubscription.subscriptionPrice}}.00/year</p>
+            <p>${{thisSubscription.subscriptionPrice.toFixed(2)}}/year</p>
           </div>
           <div class="col-12 col-md-6 col-lg-2 pt-3 pt-lg-0">
             <strong>No. of devices</strong>
@@ -89,8 +89,8 @@
           <div class="row pb-3 mx-0">
             <div style="max-width: 16px;" class="col-1 px-0"><img style="margin-top: 5px; height: 16px; width: 16px;" src="/images/icon-calendar-32x32@2x.png" alt="A calendar icon"></div>
             <div class="col pl-3">
-              <p>{{thisSubscription.numberOfHosts}} devices @ ${{thisSubscription.subscriptionPrice / thisSubscription.numberOfHosts / 12}}.00/device/month</p>
-              <p>Billed annually at ${{thisSubscription.subscriptionPrice}}.00/yr</p>
+              <p>{{thisSubscription.numberOfHosts}} devices @ ${{(thisSubscription.subscriptionPrice / thisSubscription.numberOfHosts / 12).toFixed(2)}}/device/month</p>
+              <p>Billed annually at ${{thisSubscription.subscriptionPrice.toFixed(2)}}/yr</p>
               <p v-if="willSubscriptionRenew">Next payment on <js-timestamp :at="thisSubscription.nextBillingAt" always-show-year format="billing"></js-timestamp></p>
               <p v-else>Your subscription will expire on <js-timestamp :at="thisSubscription.nextBillingAt" always-show-year format="billing"></js-timestamp></p>
             </div>