Allow subscriptions to cost amounts other than one dollar and twenty three cents

Summary: Ref T6881. Sometimes, goods and services cost arbitrary amounts.

Test Plan: See next diff.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T6881

Differential Revision: https://secure.phabricator.com/D11594

src/applications/phortune/product/PhortuneSubscriptionProduct.php

@@ -43,6 +43,7 @@ final class PhortuneSubscriptionProduct
   }
 
   public function getPriceAsCurrency(PhortuneProduct $product) {
+    // Prices are calculated by the SubscriptionImplementation.
     return PhortuneCurrency::newEmptyCurrency();
   }
 

src/applications/phortune/storage/PhortuneSubscription.php

@@ -183,6 +183,13 @@ final class PhortuneSubscription extends PhortuneDAO
     return "/phortune/merchant/{$merchant_id}/subscription/view/{$id}/";
   }
 
+  public function getCostForBillingPeriodAsCurrency($start_epoch, $end_epoch) {
+    return $this->getImplementation()->getCostForBillingPeriodAsCurrency(
+      $this,
+      $start_epoch,
+      $end_epoch);
+  }
+
 
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */
 

src/applications/phortune/subscription/PhortuneSubscriptionImplementation.php

@@ -8,6 +8,10 @@ abstract class PhortuneSubscriptionImplementation {
 
   abstract public function getRef();
   abstract public function getName(PhortuneSubscription $subscription);
+  abstract public function getCostForBillingPeriodAsCurrency(
+    PhortuneSubscription $subscription,
+    $start_epoch,
+    $end_epoch);
 
   protected function getContentSource() {
     return PhabricatorContentSource::newForSource(

src/applications/phortune/worker/PhortuneSubscriptionWorker.php

@@ -42,9 +42,9 @@ final class PhortuneSubscriptionWorker extends PhabricatorWorker {
 
     $purchase = $cart->newPurchase($actor, $product);
 
-    // TODO: Consider allowing subscriptions to cost an amount other than one
+    $currency = $subscription->getCostForBillingPeriodAsCurrency(
-    // dollar and twenty-three cents.
+      $last_epoch,
-    $currency = PhortuneCurrency::newFromUserInput($actor, '1.23 USD');
+      $next_epoch);
 
     $purchase
       ->setBasePriceAsCurrency($currency)