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message.go
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message.go
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// Copyright (c) 2017 Nicolas Martyanoff <khaelin@gmail.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
package mbox
import (
"bytes"
"errors"
"fmt"
"regexp"
"time"
)
const HeaderDateFormat = "Mon Jan 02 15:04:05 -0700 2006"
func ParseMessagePrefix(data []byte) (id string, date time.Time, err error) {
const prefix = "From "
if !bytes.HasPrefix(data, []byte(prefix)) {
err = fmt.Errorf("missing prefix %q", prefix)
return
}
data = data[len(prefix):]
idx := bytes.IndexByte(data, ' ')
if idx == -1 {
err = errors.New("missing ' ' after message id")
return
}
id = string(data[:idx])
data = data[idx+1:]
date, err = time.Parse(HeaderDateFormat, string(data))
if err != nil {
err = fmt.Errorf("invalid date %q", string(data))
return
}
return
}
type Message struct {
Id string
Date time.Time
Data []byte
}
func NewMessage(id string, date time.Time, data []byte) *Message {
msg := &Message{
Id: id,
Date: date,
Data: data,
}
return msg
}
var FromLineRegexp = regexp.MustCompile("^>+From ")
func UnescapeMessageData(data []byte) []byte {
var buf bytes.Buffer
start := true
for len(data) > 0 {
if !start {
idx := bytes.Index(data, []byte{'\r', '\n'})
if idx == -1 {
buf.Write(data)
break
}
buf.Write(data[:idx+2])
data = data[idx+2:]
}
start = false
match := FromLineRegexp.Find(data)
if match == nil {
continue
}
buf.Write(match[1:]) // skip the first '>'
data = data[len(match):]
}
return buf.Bytes()
}