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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package mail implements parsing of mail messages according to RFC 5322.
package mail
import (
"bufio"
"io"
"net/textproto"
"os"
"time"
)
// A Message represents a parsed mail message.
type Message struct {
Header Header
Body io.Reader
}
// ReadMessage reads a message from r.
// The headers are parsed, and the body of the message will be reading from r.
func ReadMessage(r io.Reader) (msg *Message, err os.Error) {
tp := textproto.NewReader(bufio.NewReader(r))
hdr, err := tp.ReadMIMEHeader()
if err != nil {
return nil, err
}
return &Message{
Header: Header(hdr),
Body: tp.R,
}, nil
}
// Layouts suitable for passing to time.Parse.
// These are tried in order.
var dateLayouts []string
func init() {
// Generate layouts based on RFC 5322, section 3.3.
dows := [...]string{"", "Mon, "} // day-of-week
days := [...]string{"2", "02"} // day = 1*2DIGIT
years := [...]string{"2006", "06"} // year = 4*DIGIT / 2*DIGIT
seconds := [...]string{":05", ""} // second
zones := [...]string{"-0700", "MST"} // zone = (("+" / "-") 4DIGIT) / "GMT" / ...
for _, dow := range dows {
for _, day := range days {
for _, year := range years {
for _, second := range seconds {
for _, zone := range zones {
s := dow + day + " Jan " + year + " 15:04" + second + " " + zone
dateLayouts = append(dateLayouts, s)
}
}
}
}
}
}
func parseDate(date string) (*time.Time, os.Error) {
for _, layout := range dateLayouts {
t, err := time.Parse(layout, date)
if err == nil {
return t, nil
}
}
return nil, os.ErrorString("mail: header could not be parsed")
}
// TODO(dsymonds): Parsers for more specific headers such as To, From, etc.
// A Header represents the key-value pairs in a mail message header.
type Header map[string][]string
// Get gets the first value associated with the given key.
// If there are no values associated with the key, Get returns "".
func (h Header) Get(key string) string {
return textproto.MIMEHeader(h).Get(key)
}
var ErrHeaderNotPresent = os.ErrorString("mail: header not in message")
// Date parses the Date header field.
func (h Header) Date() (*time.Time, os.Error) {
hdr := h.Get("Date")
if hdr == "" {
return nil, ErrHeaderNotPresent
}
return parseDate(hdr)
}
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