From 900bb5e845c3ad44defbd427cae3d44a4a43321f Mon Sep 17 00:00:00 2001
From: ivarlovlie <git@ivarlovlie.no>
Date: Sat, 25 Feb 2023 13:15:44 +0100
Subject: feat: Initial commit

---
 code/api/src/Services/MailService.cs | 132 +++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 code/api/src/Services/MailService.cs

(limited to 'code/api/src/Services/MailService.cs')

diff --git a/code/api/src/Services/MailService.cs b/code/api/src/Services/MailService.cs
new file mode 100644
index 0000000..a6f7db4
--- /dev/null
+++ b/code/api/src/Services/MailService.cs
@@ -0,0 +1,132 @@
+namespace IOL.GreatOffice.Api.Services;
+
+public class MailService
+{
+    private readonly ILogger<MailService> _logger;
+    private static string _fromEmail;
+    private readonly HttpClient _httpClient;
+
+    public MailService(VaultService vaultService, ILogger<MailService> logger, HttpClient httpClient) {
+        var configuration = vaultService.GetCurrentAppConfiguration();
+        _fromEmail = configuration.EMAIL_FROM_ADDRESS;
+        _logger = logger;
+        httpClient.DefaultRequestHeaders.Add("X-Postmark-Server-Token", configuration.POSTMARK_TOKEN);
+        _httpClient = httpClient;
+    }
+
+    /// <summary>
+    /// Send an email.
+    /// </summary>
+    /// <param name="message"></param>
+    /// <exception cref="ArgumentException"></exception>
+    public async Task SendMailAsync(PostmarkEmail message) {
+        try {
+            if (message.MessageStream.IsNullOrWhiteSpace()) {
+                message.MessageStream = "outbound";
+            }
+
+            if (message.From.IsNullOrWhiteSpace() && _fromEmail.HasValue()) {
+                message.From = _fromEmail;
+            } else {
+                throw new ApplicationException("Not one from-email is available");
+            }
+
+            if (message.To.IsNullOrWhiteSpace()) {
+                throw new ArgumentNullException(nameof(message.To), "A recipient should be specified.");
+            }
+
+            if (!message.To.IsValidEmailAddress()) {
+                throw new ArgumentException(nameof(message.To), "To is not a valid email address");
+            }
+
+            if (message.HtmlBody.IsNullOrWhiteSpace() && message.TextBody.IsNullOrWhiteSpace()) {
+                throw new ArgumentNullException(nameof(message), "Both HtmlBody and TextBody is empty, nothing to send");
+            }
+#if DEBUG
+            _logger.LogInformation("Sending email: {0}", JsonSerializer.Serialize(message, new JsonSerializerOptions() {WriteIndented = true}));
+#endif
+            var response = await _httpClient.PostAsJsonAsync("https://api.postmarkapp.com/email", message);
+            _logger.LogInformation("Postmark returned with message: {0}", (await response.Content.ReadFromJsonAsync<PostmarkSendResponse>()).Message);
+        } catch (Exception e) {
+            _logger.LogError(e, "A silent exception occured while trying to send an email");
+        }
+    }
+
+    private class PostmarkSendResponse
+    {
+        /// <summary>
+        ///   The Message ID returned from Postmark.
+        /// </summary>
+        public Guid MessageID { get; set; }
+
+        /// <summary>
+        ///   The message from the API.  
+        ///   In the event of an error, this message may contain helpful text.
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <summary>
+        ///   The time the request was received by Postmark.
+        /// </summary>
+        public DateTime SubmittedAt { get; set; }
+
+        /// <summary>
+        ///   The recipient of the submitted request.
+        /// </summary>
+        public string To { get; set; }
+
+        /// <summary>
+        ///   The error code returned from Postmark.
+        ///   This does not map to HTTP status codes.
+        /// </summary>
+        public int ErrorCode { get; set; }
+    }
+
+    public class PostmarkEmail
+    {
+        /// <summary>
+        ///   The message subject line.
+        /// </summary>
+        public string Subject { get; set; }
+
+        /// <summary>
+        ///   The message body, if the message contains
+        /// </summary>
+        public string HtmlBody { get; set; }
+
+        /// <summary>
+        ///   The message body, if the message is plain text.
+        /// </summary>
+        public string TextBody { get; set; }
+
+        /// <summary>
+        ///   The message stream used to send this message.
+        /// </summary>
+        public string MessageStream { get; set; }
+
+        /// <summary>
+        ///   The sender's email address.
+        /// </summary>
+        public string From { get; set; }
+
+        /// <summary>
+        ///   Any recipients. Separate multiple recipients with a comma.
+        /// </summary>
+        public string To { get; set; }
+
+        /// <summary>
+        ///   Any CC recipients. Separate multiple recipients with a comma.
+        /// </summary>
+        public string Cc { get; set; }
+
+        /// <summary>
+        ///   Any BCC recipients. Separate multiple recipients with a comma.
+        /// </summary>
+        public string Bcc { get; set; }
+
+        /// <summary>
+        ///   The email address to reply to. This is optional.
+        /// </summary>
+        public string ReplyTo { get; set; }
+    }
+}
\ No newline at end of file
-- 
cgit v1.3