-
Notifications
You must be signed in to change notification settings - Fork 1
/
commands.go
177 lines (161 loc) · 3.83 KB
/
commands.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
package main
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io"
"log"
"mime"
"net/mail"
"os"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/creachadair/atomicfile"
"github.com/creachadair/command"
)
var fromLineRE = regexp.MustCompile(`(?m)^From .*\n`)
type msgInfo struct {
Index int `json:"index"`
Line int `json:"line,omitempty"`
Size int64 `json:"size"`
ContentType string `json:"contentType"`
Charset string `json:"charset,omitempty"`
Boundary string `json:"boundary,omitempty"`
}
func runList(env *command.Env, mailbox string) error {
f, err := os.Open(mailbox)
if err != nil {
return err
}
defer f.Close()
enc := json.NewEncoder(os.Stdout)
return splitMailbox(bufio.NewReader(f), func(index, lnum int, data []byte) error {
_, mi, err := parseMessage(data)
if err != nil {
log.Printf("WARNING: index %d: invalid message: %v", index, err)
}
mi.Index = index
mi.Line = lnum
return enc.Encode(mi)
})
}
func runBurst(env *command.Env, mailbox, outDir string) error {
f, err := os.Open(mailbox)
if err != nil {
return err
}
defer f.Close()
if err := os.MkdirAll(outDir, 0700); err != nil {
return err
}
return splitMailbox(bufio.NewReader(f), func(index, lnum int, data []byte) error {
msg, _, err := parseMessage(data)
if err != nil {
return fmt.Errorf("index %d line %d: %w", index, lnum, err)
}
mpath := filepath.Join(outDir, messagePath(msg))
if err := os.MkdirAll(filepath.Dir(mpath), 0700); err != nil {
return err
}
if err := atomicfile.WriteData(mpath, data, 0600); err != nil {
return fmt.Errorf("write %q: %w", mpath, err)
}
log.Printf("message %d (line %d) wrote %d bytes to %q", index, lnum, len(data), mpath)
return nil
})
}
func splitMailbox(r io.Reader, f func(index, lnum int, msg []byte) error) error {
var buf bytes.Buffer
var atEOF bool
index, lnum := 0, 1
for {
m := fromLineRE.FindIndex(buf.Bytes())
if m == nil {
if atEOF {
break
}
var tmp [1 << 20]byte
n, err := r.Read(tmp[:])
buf.Write(tmp[:n])
if err == io.EOF {
atEOF = true
} else if err != nil {
return err
}
continue
}
msg := buf.Next(m[0])
if len(msg) != 0 {
index++
if err := f(index, lnum, msg); err != nil {
return err
}
lnum++ // for the From line itself
lnum += bytes.Count(msg, []byte("\n"))
}
buf.Next(m[1] - m[0]) // drop the separator
}
if buf.Len() != 0 {
index++
return f(index, lnum, buf.Bytes())
}
return nil
}
func parseMessage(data []byte) (*mail.Message, msgInfo, error) {
mi := msgInfo{Size: int64(len(data)), ContentType: "invalid"}
msg, err := mail.ReadMessage(bytes.NewReader(data))
if err == nil {
mi.ContentType = msg.Header.Get("Content-Type")
ctype, params, err := mime.ParseMediaType(mi.ContentType)
if err == nil {
mi.ContentType = ctype
mi.Charset = params["charset"]
mi.Boundary = params["boundary"]
}
}
return msg, mi, err
}
func messagePath(msg *mail.Message) string {
const nameStamp = "20060102-150405.999"
tag, base := pickTag(msg), "0000/00"
date, err := msg.Header.Date()
if err != nil {
date = time.Now()
} else {
base = date.Format("2006/01")
}
name := fmt.Sprintf("msg.%s.txt", date.UTC().Format(nameStamp))
return filepath.Join(tag, base, name)
}
func pickTag(msg *mail.Message) string {
tags := msg.Header.Get("X-Gmail-Labels")
btag := "misc"
var score int
for _, tag := range strings.Split(strings.ToLower(tags), ",") {
got, sc := tagScore(tag)
if sc > score {
btag, score = got, sc
}
}
return btag
}
func tagScore(t string) (string, int) {
switch t {
case "":
return t, 0
case "archived", "category", "opened", "sent":
return t, 1
case "spam":
return t, 2
case "[gmail]all mail":
return "untagged", 2
default:
if rest, ok := strings.CutPrefix(t, "category "); ok {
return rest, 3
}
return t, 4
}
}