From 64cf341b530d78f8ec8c6ee180109cafe7d2e519 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bal=C3=A1zs=20Keresztury?= <b@belidzs.hu>
Date: Mon, 25 May 2020 15:14:10 +0200
Subject: [PATCH] Added support for mailgun variables

---
 src/FluentEmail.Core/Email.cs                    | 13 +++++++++++++
 src/FluentEmail.Core/IFluentEmail.cs             |  8 ++++++++
 src/FluentEmail.Core/Models/EmailData.cs         |  4 +++-
 src/Senders/FluentEmail.Mailgun/MailgunSender.cs |  5 +++++
 4 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/src/FluentEmail.Core/Email.cs b/src/FluentEmail.Core/Email.cs
index 57142656..0af87425 100644
--- a/src/FluentEmail.Core/Email.cs
+++ b/src/FluentEmail.Core/Email.cs
@@ -484,6 +484,19 @@ public IFluentEmail Tag(string tag)
             return this;
         }
 
+        /// <summary>
+        /// Adds variables to the Email. This is currently only supported by the Mailgun provider. <see href="https://documentation.mailgun.com/en/latest/user_manual.html#attaching-data-to-messages"/>
+        /// </summary>
+        /// <param name="key">Variable name</param>
+        /// /// <param name="value">Variable value</param>
+        /// <returns>Instance of the Email class</returns>
+        public IFluentEmail Variable(string key, string value)
+        {
+            Data.Variables.Add(key, value);
+
+            return this;
+        }
+
         public IFluentEmail Header(string header, string body)
         {
             Data.Headers.Add(header, body);
diff --git a/src/FluentEmail.Core/IFluentEmail.cs b/src/FluentEmail.Core/IFluentEmail.cs
index f22197ac..e234851c 100644
--- a/src/FluentEmail.Core/IFluentEmail.cs
+++ b/src/FluentEmail.Core/IFluentEmail.cs
@@ -234,6 +234,14 @@ public interface IFluentEmail: IHideObjectMembers
 	    /// <returns>Instance of the Email class</returns>
 	    IFluentEmail Tag(string tag);
 
+		/// <summary>
+		/// Adds variables to the Email. This is currently only supported by the Mailgun provider. <see href="https://documentation.mailgun.com/en/latest/user_manual.html#attaching-data-to-messages"/>
+		/// </summary>
+		/// <param name="key">Variable name</param>
+		/// /// <param name="value">Variable value</param>
+		/// <returns>Instance of the Email class</returns>
+		IFluentEmail Variable(string key, string value);
+
 	    /// <summary>
 	    /// Adds header to the Email.
 	    /// </summary>
diff --git a/src/FluentEmail.Core/Models/EmailData.cs b/src/FluentEmail.Core/Models/EmailData.cs
index 2ba104e5..4d0626de 100644
--- a/src/FluentEmail.Core/Models/EmailData.cs
+++ b/src/FluentEmail.Core/Models/EmailData.cs
@@ -14,7 +14,8 @@ public class EmailData
         public string Body { get; set; }
         public string PlaintextAlternativeBody { get; set; }
         public Priority Priority { get; set; }
-        public IList<string> Tags { get; set; }
+        public List<string> Tags { get; set; }
+        public Dictionary<string, string> Variables { get; set; }
 
         public bool IsHtml { get; set; }
         public IDictionary<string, string> Headers { get; set; }
@@ -27,6 +28,7 @@ public EmailData()
             ReplyToAddresses = new List<Address>();
             Attachments = new List<Attachment>();
             Tags = new List<string>();
+            Variables = new Dictionary<string, string>();
             Headers = new Dictionary<string, string>();
         }
     }
diff --git a/src/Senders/FluentEmail.Mailgun/MailgunSender.cs b/src/Senders/FluentEmail.Mailgun/MailgunSender.cs
index c1f3f359..1b8cf369 100644
--- a/src/Senders/FluentEmail.Mailgun/MailgunSender.cs
+++ b/src/Senders/FluentEmail.Mailgun/MailgunSender.cs
@@ -80,6 +80,11 @@ public async Task<SendResponse> SendAsync(IFluentEmail email, CancellationToken?
                 parameters.Add(new KeyValuePair<string, string>("o:tag", x));
             });
 
+            foreach (var item in email.Data.Variables)
+            {
+                parameters.Add(new KeyValuePair<string, string>($"v:{item.Key}", item.Value));
+            }
+
             foreach (var emailHeader in email.Data.Headers)
             {
                 var key = emailHeader.Key;