feature: throwing exception on missing content type

FitConnect/Encryption/JoseEncryptor.cs

 using System.Net.Mime;
+using FitConnect.Exceptions;
 using Jose;
+using Microsoft.IdentityModel.Tokens;
 
 // ReSharper disable RedundantExplicitArrayCreation
 
@@ -30,6 +32,8 @@ public class JoseEncryptor : IEncryptor {
     }
 
     public string Encrypt(string key, string plain, string contentType) {
+        if (contentType.IsNullOrEmpty())
+            throw new FitConnectSenderException("Content Type is not set");
         try {
             var jwk = Jwk.FromJson(key, new JsonMapper());
             if (!jwk.KeyOps.Contains(EncryptionSettings.KeyOpsWrapKey))
@@ -51,6 +55,9 @@ public class JoseEncryptor : IEncryptor {
     }
 
     public string Encrypt(string key, byte[] plain, string contentType) {
+        if (contentType.IsNullOrEmpty())
+            throw new FitConnectSenderException("Content Type is not set");
+
         try {
             var jwk = Jwk.FromJson(key, new JsonMapper());
             return JWE.EncryptBytes(plain,

FitConnect/FitConnectClient.cs

@@ -242,7 +242,7 @@ public abstract class FitConnectClient: IFitConnectClient {
     /// <param name="attachment"></param>
     /// <returns></returns>
     public KeyValuePair<Guid, string> Encrypt(string publicKey, Attachment attachment) {
-        var content = Encryption.Encrypt(attachment.GetBytes(), publicKey);
+        var content = Encryption.Encrypt(attachment.GetBytes(), publicKey, attachment.MimeType);
         return new KeyValuePair<Guid, string>(attachment.Id, content);
     }
 

Tests/E2ETest/StraightForwardTest.cs

@@ -31,11 +31,11 @@ public class StraightForwardTest : EndToEndTestBase {
             .SetServiceType(Settings.ServiceIdentifier, "Straight forward test")
             .SetJsonData(JSON_DATA, new Uri(JSON_SCHEMA_URI))
             .AddAttachments(
-                Attachment.FromPath("Test.pdf", "application/pdf", description: "Attachment #1",
+                Attachment.FromPath("Test.pdf", MediaTypeNames.Application.Pdf, description: "Attachment #1",
                     fileName: "Test.pdf"),
-                Attachment.FromPath("Test.pdf", "application/pdf", description: "Attachment #2",
+                Attachment.FromPath("Test.pdf", MediaTypeNames.Application.Pdf, description: "Attachment #2",
                     fileName: "Test.pdf"))
-            .AddAttachment(Attachment.FromPath("Test.pdf", "application/pdf",
+            .AddAttachment(Attachment.FromPath("Test.pdf", MediaTypeNames.Application.Pdf,
                 description: "Attachment #3", fileName: "Test.pdf"))
             .AddAttachment(Attachment.FromByteArray(
                 Encoding.UTF8.GetBytes("{\"message\":\"Hello World\"}"),