bulk invite apis

src/Core/Models/Api/Request/Organizations/OrganizationUserRequestModels.cs

@@ -1,18 +1,41 @@
 using Bit.Core.Models.Table;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System;
+using System.Linq;
 
 namespace Bit.Core.Models.Api
 {
-    public class OrganizationUserInviteRequestModel
+    public class OrganizationUserInviteRequestModel : IValidatableObject
     {
         [Required]
-        [EmailAddress]
-        public string Email { get; set; }
+        public IEnumerable<string> Emails { get; set; }
         [Required]
         public Enums.OrganizationUserType? Type { get; set; }
         public bool AccessAll { get; set; }
         public IEnumerable<SelectionReadOnlyRequestModel> Collections { get; set; }
+
+        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
+        {
+            if(!Emails.Any())
+            {
+                yield return new ValidationResult("An email is required.");
+            }
+
+            if(Emails.Count() > 20)
+            {
+                yield return new ValidationResult("You can only invite up to 20 users at a time.");
+            }
+
+            var attr = new EmailAddressAttribute();
+            for(int i = 0; i < Emails.Count(); i++)
+            {
+                if(!attr.IsValid(Emails.ElementAt(i)))
+                {
+                    yield return new ValidationResult($"Email #{i + 1} is not valid.", new string[] { nameof(Emails) });
+                }
+            }
+        }
     }
 
     public class OrganizationUserAcceptRequestModel