Feature/token service (#1785)

* Implement draft token service

* Add tokenizer and factory

* Handle expiring tokens through base class

* Allow direct token validity checks

* Add safe unprotect to tokenizer

* Add interface to tokenizer factory

* Use tokenizer

* Fix rebase

* Handle cleartext prefix in tokenizer base

* Use epoch milliseconds for expiration in tokens

* Use tokenizers

* Test tokens

* Linter fixes

* Add TokenizerFactory to DI services

* Test epoch milliseconds deserialization

* Use separate injectables for each token type

* Fix directory

* Add functional unprotect to token

* Fix namespace and correct object names

* Remove Tokenable interface

* Test remaining Tokens classes

* Dotnet format

* Fix sut provider errors with update

* Remove useless property

Co-authored-by: Hinton <oscar@oscarhinton.com>

test/Core.Test/Tokens/ExpiringTokenTests.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Text.Json;
+using AutoFixture.Xunit2;
+using Bit.Core.Utilities;
+using Xunit;
+
+namespace Bit.Core.Test.Tokens
+{
+    public class ExpiringTokenTests
+    {
+        [Theory, AutoData]
+        public void ExpirationSerializesToEpochMilliseconds(DateTime expirationDate)
+        {
+            var sut = new TestExpiringTokenable
+            {
+                ExpirationDate = expirationDate
+            };
+
+            var result = JsonSerializer.Serialize(sut);
+            var expectedDate = CoreHelpers.ToEpocMilliseconds(expirationDate);
+
+            Assert.Contains($"\"ExpirationDate\":{expectedDate}", result);
+        }
+
+        [Theory, AutoData]
+        public void ExpirationSerializationRoundTrip(DateTime expirationDate)
+        {
+            var sut = new TestExpiringTokenable
+            {
+                ExpirationDate = expirationDate
+            };
+
+            var intermediate = JsonSerializer.Serialize(sut);
+            var result = JsonSerializer.Deserialize<TestExpiringTokenable>(intermediate);
+
+            Assert.Equal(sut.ExpirationDate, result.ExpirationDate, TimeSpan.FromMilliseconds(100));
+        }
+
+        [Fact]
+        public void InvalidIfPastExpiryDate()
+        {
+            var sut = new TestExpiringTokenable
+            {
+                ExpirationDate = DateTime.UtcNow.AddHours(-1)
+            };
+
+            Assert.False(sut.Valid);
+        }
+
+        [Fact]
+        public void ValidIfWithinExpirationAndTokenReportsValid()
+        {
+            var sut = new TestExpiringTokenable
+            {
+                ExpirationDate = DateTime.UtcNow.AddHours(1)
+            };
+
+            Assert.True(sut.Valid);
+        }
+
+        [Fact]
+        public void HonorsTokenIsValidAbstractMember()
+        {
+            var sut = new TestExpiringTokenable(forceInvalid: true)
+            {
+                ExpirationDate = DateTime.UtcNow.AddHours(1)
+            };
+
+            Assert.False(sut.Valid);
+        }
+    }
+}