Update vendor/

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

@@ -0,0 +1,57 @@
+package mail
+
+import (
+	"net/mail"
+	"time"
+
+	"github.com/emersion/go-message"
+	"github.com/emersion/go-message/charset"
+)
+
+const dateLayout = "Mon, 02 Jan 2006 15:04:05 -0700"
+
+// A Header is a mail header.
+type Header struct {
+	message.Header
+}
+
+// NewHeader creates a new mail header.
+func NewHeader() Header {
+	return Header{make(message.Header)}
+}
+
+// AddressList parses the named header field as a list of addresses. If the
+// header is missing, it returns nil.
+func (h Header) AddressList(key string) ([]*Address, error) {
+	v := h.Get(key)
+	if v == "" {
+		return nil, nil
+	}
+	return parseAddressList(v)
+}
+
+// SetAddressList formats the named header to the provided list of addresses.
+func (h Header) SetAddressList(key string, addrs []*Address) {
+	h.Set(key, formatAddressList(addrs))
+}
+
+// Date parses the Date header field.
+func (h Header) Date() (time.Time, error) {
+	return mail.Header(h.Header).Date()
+}
+
+// SetDate formats the Date header field.
+func (h Header) SetDate(t time.Time) {
+	h.Set("Date", t.Format(dateLayout))
+}
+
+// Subject parses the Subject header field. If there is an error, the raw field
+// value is returned alongside the error.
+func (h Header) Subject() (string, error) {
+	return charset.DecodeHeader(h.Get("Subject"))
+}
+
+// SetSubject formats the Subject header field.
+func (h Header) SetSubject(s string) {
+	h.Set("Subject", charset.EncodeHeader(s))
+}