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
|
package lib
import (
"bufio"
"bytes"
"io"
"mime"
"net/http"
"os"
"path/filepath"
"strings"
"git.sr.ht/~rjarry/aerc/lib/log"
"github.com/emersion/go-message/mail"
"github.com/pkg/errors"
)
type Part struct {
MimeType string
Params map[string]string
Data []byte
Converted bool
ConversionError error
}
func NewPart(mimetype string, params map[string]string, body io.Reader,
) (*Part, error) {
var d []byte
var err error
var converted bool
if body == nil {
converted = true
} else {
d, err = io.ReadAll(body)
if err != nil {
return nil, err
}
}
return &Part{
MimeType: mimetype,
Params: params,
Data: d,
Converted: converted,
}, nil
}
func (p *Part) NewReader() io.Reader {
return bytes.NewReader(p.Data)
}
type Attachment interface {
Name() string
WriteTo(w *mail.Writer) error
}
type FileAttachment struct {
path string
}
func NewFileAttachment(path string) *FileAttachment {
return &FileAttachment{
path,
}
}
func (fa *FileAttachment) Name() string {
return fa.path
}
func (fa *FileAttachment) WriteTo(w *mail.Writer) error {
f, err := os.Open(fa.path)
if err != nil {
return errors.Wrap(err, "os.Open")
}
defer f.Close()
reader := bufio.NewReader(f)
mimeType, params, err := FindMimeType(fa.path, reader)
if err != nil {
return errors.Wrap(err, "ParseMediaType")
}
filename := filepath.Base(fa.path)
params["name"] = filename
// set header fields
ah := mail.AttachmentHeader{}
ah.SetContentType(mimeType, params)
// setting the filename auto sets the content disposition
ah.SetFilename(filename)
aw, err := w.CreateAttachment(ah)
if err != nil {
return errors.Wrap(err, "CreateAttachment")
}
defer aw.Close()
if _, err := reader.WriteTo(aw); err != nil {
return errors.Wrap(err, "reader.WriteTo")
}
return nil
}
type PartAttachment struct {
part *Part
name string
}
func NewPartAttachment(part *Part, name string) *PartAttachment {
return &PartAttachment{
part,
name,
}
}
func (pa *PartAttachment) Name() string {
return pa.name
}
func (pa *PartAttachment) WriteTo(w *mail.Writer) error {
// set header fields
ah := mail.AttachmentHeader{}
ah.SetContentType(pa.part.MimeType, pa.part.Params)
// setting the filename auto sets the content disposition
ah.SetFilename(pa.Name())
aw, err := w.CreateAttachment(ah)
if err != nil {
return errors.Wrap(err, "CreateAttachment")
}
defer aw.Close()
if _, err := io.Copy(aw, pa.part.NewReader()); err != nil {
return errors.Wrap(err, "io.Copy")
}
return nil
}
// SetUtf8Charset sets the charset in a params map to UTF-8.
func SetUtf8Charset(origParams map[string]string) map[string]string {
params := make(map[string]string)
for k, v := range origParams {
switch strings.ToLower(k) {
case "charset":
log.Debugf("substitute charset %s with utf-8", v)
params[k] = "utf-8"
default:
params[k] = v
}
}
return params
}
func FindMimeType(filename string, reader *bufio.Reader) (string, map[string]string, error) {
// if we have an extension, prefer that instead of trying to sniff the header.
// That's generally more accurate than sniffing as lots of things are zip files
// under the hood, e.g. most office file types
ext := filepath.Ext(filename)
var mimeString string
if mimeString = mime.TypeByExtension(ext); mimeString == "" {
// Sniff the mime type since it's not in the database
// http.DetectContentType only cares about the first 512 bytes
head, err := reader.Peek(512)
if err != nil && err != io.EOF {
return "", map[string]string{}, errors.Wrap(err, "Peek")
}
mimeString = http.DetectContentType(head)
}
// mimeString can contain type and params (like text encoding),
// so we need to break them apart before passing them to the headers
return mime.ParseMediaType(mimeString)
}
|
