From d390bc904c1cbc58299dde0f3ec6425b89eb4b0c Mon Sep 17 00:00:00 2001
From: Kailash Nadh <kailash@nadh.in>
Date: Sun, 21 Jul 2019 12:30:51 +0530
Subject: [PATCH] Add helper to make mail attachment headers

---
 messenger/messenger.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/messenger/messenger.go b/messenger/messenger.go
index 66b6e24..65772fa 100644
--- a/messenger/messenger.go
+++ b/messenger/messenger.go
@@ -18,3 +18,17 @@ type Attachment struct {
 	Header  textproto.MIMEHeader
 	Content []byte
 }
+
+// MakeAttachmentHeader is a helper function that returns a
+// textproto.MIMEHeader tailored for attachments, primarily
+// email. If no encoding is given, base64 is assumed.
+func MakeAttachmentHeader(filename, encoding string) textproto.MIMEHeader {
+	if encoding == "" {
+		encoding = "base64"
+	}
+	h := textproto.MIMEHeader{}
+	h.Set("Content-Disposition", "attachment; filename="+filename)
+	h.Set("Content-Type", "application/json; name=\""+filename+"\"")
+	h.Set("Content-Transfer-Encoding", "base64")
+	return h
+}