[PM-20084] [PM-20086] Add TrialLength parameter to trial initiation endpoint and email (#5770)

* Add trial length parameter to trial initiation endpoint and email

* Add feature flag that pegs trial length to 7 when disabled

* Add optionality to Identity

* Move feature service injection to identity accounts controller

src/Identity/Billing/Controller/AccountsController.cs

@@ -1,6 +1,8 @@
-using Bit.Core.Billing.Models.Api.Requests.Accounts;
+using Bit.Core;
+using Bit.Core.Billing.Models.Api.Requests.Accounts;
 using Bit.Core.Billing.TrialInitiation.Registration;
 using Bit.Core.Context;
+using Bit.Core.Services;
 using Bit.Core.Tools.Enums;
 using Bit.Core.Tools.Models.Business;
 using Bit.Core.Tools.Services;
@@ -15,18 +17,24 @@ namespace Bit.Identity.Billing.Controller;
 public class AccountsController(
     ICurrentContext currentContext,
     ISendTrialInitiationEmailForRegistrationCommand sendTrialInitiationEmailForRegistrationCommand,
-    IReferenceEventService referenceEventService) : Microsoft.AspNetCore.Mvc.Controller
+    IReferenceEventService referenceEventService,
+    IFeatureService featureService) : Microsoft.AspNetCore.Mvc.Controller
 {
     [HttpPost("trial/send-verification-email")]
     [SelfHosted(NotSelfHostedOnly = true)]
     public async Task<IActionResult> PostTrialInitiationSendVerificationEmailAsync([FromBody] TrialSendVerificationEmailRequestModel model)
     {
+        var allowTrialLength0 = featureService.IsEnabled(FeatureFlagKeys.PM20322_AllowTrialLength0);
+
+        var trialLength = allowTrialLength0 ? model.TrialLength ?? 7 : 7;
+
         var token = await sendTrialInitiationEmailForRegistrationCommand.Handle(
             model.Email,
             model.Name,
             model.ReceiveMarketingEmails,
             model.ProductTier,
-            model.Products);
+            model.Products,
+            trialLength);
 
         var refEvent = new ReferenceEvent
         {

src/Identity/Startup.cs

@@ -145,6 +145,7 @@ public class Startup
         // Services
         services.AddBaseServices(globalSettings);
         services.AddDefaultServices(globalSettings);
+        services.AddOptionality();
         services.AddCoreLocalizationServices();
         services.AddBillingOperations();