/
search.go
225 lines (198 loc) · 4.5 KB
/
search.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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
package backendutil
import (
"bytes"
"fmt"
"io"
"strings"
"time"
"github.com/emersion/go-imap"
"github.com/emersion/go-message"
"github.com/emersion/go-message/mail"
)
func matchString(s, substr string) bool {
return strings.Contains(strings.ToLower(s), strings.ToLower(substr))
}
func bufferBody(e *message.Entity) (*bytes.Buffer, error) {
b := new(bytes.Buffer)
if _, err := io.Copy(b, e.Body); err != nil {
return nil, err
}
e.Body = b
return b, nil
}
func matchBody(e *message.Entity, substr string) (bool, error) {
if s, ok := e.Body.(fmt.Stringer); ok {
return matchString(s.String(), substr), nil
}
b, err := bufferBody(e)
if err != nil {
return false, err
}
return matchString(b.String(), substr), nil
}
type lengther interface {
Len() int
}
func bodyLen(e *message.Entity) (int, error) {
if l, ok := e.Body.(lengther); ok {
return l.Len(), nil
}
b, err := bufferBody(e)
if err != nil {
return 0, err
}
return b.Len(), nil
}
// Match returns true if a message matches the provided criteria. Sequence
// number, UID, flag and internal date contrainsts are not checked.
func Match(e *message.Entity, c *imap.SearchCriteria) (bool, error) {
// TODO: support encoded header fields for Bcc, Cc, From, To
// TODO: add header size for Larger and Smaller
h := mail.Header{e.Header}
if !c.SentBefore.IsZero() || !c.SentSince.IsZero() {
t, err := h.Date()
if err != nil {
return false, err
}
t = t.Round(24 * time.Hour)
if !c.SentBefore.IsZero() && !t.Before(c.SentBefore) {
return false, nil
}
if !c.SentSince.IsZero() && !t.After(c.SentSince) {
return false, nil
}
}
for key, wantValues := range c.Header {
values, ok := e.Header[key]
for _, wantValue := range wantValues {
if wantValue == "" && !ok {
return false, nil
}
if wantValue != "" {
ok := false
for _, v := range values {
if matchString(v, wantValue) {
ok = true
break
}
}
if !ok {
return false, nil
}
}
}
}
for _, body := range c.Body {
if ok, err := matchBody(e, body); err != nil || !ok {
return false, err
}
}
for _, text := range c.Text {
// TODO: also match header fields
if ok, err := matchBody(e, text); err != nil || !ok {
return false, err
}
}
if c.Larger > 0 || c.Smaller > 0 {
n, err := bodyLen(e)
if err != nil {
return false, err
}
if c.Larger > 0 && uint32(n) < c.Larger {
return false, nil
}
if c.Smaller > 0 && uint32(n) > c.Smaller {
return false, nil
}
}
for _, not := range c.Not {
ok, err := Match(e, not)
if err != nil || ok {
return false, err
}
}
for _, or := range c.Or {
ok1, err := Match(e, or[0])
if err != nil {
return ok1, err
}
ok2, err := Match(e, or[1])
if err != nil || (!ok1 && !ok2) {
return false, err
}
}
return true, nil
}
func matchFlags(flags map[string]bool, c *imap.SearchCriteria) bool {
for _, f := range c.WithFlags {
if !flags[f] {
return false
}
}
for _, f := range c.WithoutFlags {
if flags[f] {
return false
}
}
for _, not := range c.Not {
if matchFlags(flags, not) {
return false
}
}
for _, or := range c.Or {
if !matchFlags(flags, or[0]) && !matchFlags(flags, or[1]) {
return false
}
}
return true
}
// MatchFlags returns true if a flag list matches the provided criteria.
func MatchFlags(flags []string, c *imap.SearchCriteria) bool {
flagsMap := make(map[string]bool)
for _, f := range flags {
flagsMap[f] = true
}
return matchFlags(flagsMap, c)
}
// MatchSeqNumAndUid returns true if a sequence number and a UID matches the
// provided criteria.
func MatchSeqNumAndUid(seqNum uint32, uid uint32, c *imap.SearchCriteria) bool {
if c.SeqNum != nil && !c.SeqNum.Contains(seqNum) {
return false
}
if c.Uid != nil && !c.Uid.Contains(uid) {
return false
}
for _, not := range c.Not {
if MatchSeqNumAndUid(seqNum, uid, not) {
return false
}
}
for _, or := range c.Or {
if !MatchSeqNumAndUid(seqNum, uid, or[0]) && !MatchSeqNumAndUid(seqNum, uid, or[1]) {
return false
}
}
return true
}
// MatchDate returns true if a date matches the provided criteria.
func MatchDate(date time.Time, c *imap.SearchCriteria) bool {
date = date.Round(24 * time.Hour)
if !c.Since.IsZero() && !date.After(c.Since) {
return false
}
if !c.Before.IsZero() && !date.Before(c.Before) {
return false
}
for _, not := range c.Not {
if MatchDate(date, not) {
return false
}
}
for _, or := range c.Or {
if !MatchDate(date, or[0]) && !MatchDate(date, or[1]) {
return false
}
}
return true
}