Update vendor/

vendor/github.com/emersion/go-message/mail/attachment.go

@@ -0,0 +1,38 @@
+package mail
+
+import (
+	"github.com/emersion/go-message"
+)
+
+// An AttachmentHeader represents an attachment's header.
+type AttachmentHeader struct {
+	message.Header
+}
+
+// NewAttachmentHeader creates a new AttachmentHeader.
+func NewAttachmentHeader() AttachmentHeader {
+	h := AttachmentHeader{make(message.Header)}
+	h.Set("Content-Disposition", "attachment")
+	h.Set("Content-Transfer-Encoding", "base64")
+	return h
+}
+
+// Filename parses the attachment's filename.
+func (h AttachmentHeader) Filename() (string, error) {
+	_, params, err := h.ContentDisposition()
+
+	filename, ok := params["filename"]
+	if !ok {
+		// Using "name" in Content-Type is discouraged
+		_, params, err = h.ContentType()
+		filename = params["name"]
+	}
+
+	return filename, err
+}
+
+// SetFilename formats the attachment's filename.
+func (h AttachmentHeader) SetFilename(filename string) {
+	dispParams := map[string]string{"filename": filename}
+	h.SetContentDisposition("attachment", dispParams)
+}