~sircmpwn/aerc

ref: 89f1684ea4b5e680db7ff06a54b2d4e78212cd12 aerc/worker/maildir/search.go -rw-r--r-- 5.4 KiB
89f1684eSimon Ser Update dependencies 2 years ago
                                                                                
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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
package maildir

import (
	"io/ioutil"
	"net/textproto"
	"strings"
	"unicode"

	"github.com/emersion/go-maildir"

	"git.sr.ht/~sircmpwn/getopt"

	"git.sr.ht/~sircmpwn/aerc/models"
)

type searchCriteria struct {
	Header textproto.MIMEHeader
	Body   []string
	Text   []string

	WithFlags    []maildir.Flag
	WithoutFlags []maildir.Flag
}

func newSearchCriteria() *searchCriteria {
	return &searchCriteria{Header: make(textproto.MIMEHeader)}
}

func parseSearch(args []string) (*searchCriteria, error) {
	criteria := newSearchCriteria()

	opts, optind, err := getopt.Getopts(args, "rubat:H:f:c:")
	if err != nil {
		return nil, err
	}
	body := false
	text := false
	for _, opt := range opts {
		switch opt.Option {
		case 'r':
			criteria.WithFlags = append(criteria.WithFlags, maildir.FlagSeen)
		case 'u':
			criteria.WithoutFlags = append(criteria.WithoutFlags, maildir.FlagSeen)
		case 'H':
			// TODO
		case 'f':
			criteria.Header.Add("From", opt.Value)
		case 't':
			criteria.Header.Add("To", opt.Value)
		case 'c':
			criteria.Header.Add("Cc", opt.Value)
		case 'b':
			body = true
		case 'a':
			text = true
		}
	}
	if text {
		criteria.Text = args[optind:]
	} else if body {
		criteria.Body = args[optind:]
	} else {
		for _, arg := range args[optind:] {
			criteria.Header.Add("Subject", arg)
		}
	}
	return criteria, nil
}

func (w *Worker) search(criteria *searchCriteria) ([]uint32, error) {
	requiredParts := getRequiredParts(criteria)
	w.worker.Logger.Printf("Required parts bitmask for search: %b", requiredParts)

	keys, err := w.c.UIDs(*w.selected)
	if err != nil {
		return nil, err
	}

	matchedUids := []uint32{}
	for _, key := range keys {
		success, err := w.searchKey(key, criteria, requiredParts)
		if err != nil {
			// don't return early so that we can still get some results
			w.worker.Logger.Printf("Failed to search key %v: %v", key, err)
		} else if success {
			matchedUids = append(matchedUids, key)
		}
	}

	return matchedUids, nil
}

// Execute the search criteria for the given key, returns true if search succeeded
func (w *Worker) searchKey(key uint32, criteria *searchCriteria,
	parts MsgParts) (bool, error) {
	message, err := w.c.Message(*w.selected, key)
	if err != nil {
		return false, err
	}

	// setup parts of the message to use in the search
	// this is so that we try to minimise reading unnecessary parts
	var (
		flags  []maildir.Flag
		header *models.MessageInfo
		body   string
		all    string
	)

	if parts&FLAGS > 0 {
		flags, err = message.Flags()
		if err != nil {
			return false, err
		}
	}
	if parts&HEADER > 0 {
		header, err = message.MessageInfo()
		if err != nil {
			return false, err
		}
	}
	if parts&BODY > 0 {
		// TODO: select which part to search, maybe look for text/plain
		reader, err := message.NewBodyPartReader([]int{1})
		if err != nil {
			return false, err
		}
		bytes, err := ioutil.ReadAll(reader)
		if err != nil {
			return false, err
		}
		body = string(bytes)
	}
	if parts&ALL > 0 {
		reader, err := message.NewReader()
		if err != nil {
			return false, err
		}
		bytes, err := ioutil.ReadAll(reader)
		if err != nil {
			return false, err
		}
		all = string(bytes)
	}

	// now search through the criteria
	// implicit AND at the moment so fail fast
	if criteria.Header != nil {
		for k, v := range criteria.Header {
			headerValue := header.RFC822Headers.Get(k)
			for _, text := range v {
				if !containsSmartCase(headerValue, text) {
					return false, nil
				}
			}
		}
	}
	if criteria.Body != nil {
		for _, searchTerm := range criteria.Body {
			if !containsSmartCase(body, searchTerm) {
				return false, nil
			}
		}
	}
	if criteria.Text != nil {
		for _, searchTerm := range criteria.Text {
			if !containsSmartCase(all, searchTerm) {
				return false, nil
			}
		}
	}
	if criteria.WithFlags != nil {
		for _, searchFlag := range criteria.WithFlags {
			if !containsFlag(flags, searchFlag) {
				return false, nil
			}
		}
	}
	if criteria.WithoutFlags != nil {
		for _, searchFlag := range criteria.WithoutFlags {
			if containsFlag(flags, searchFlag) {
				return false, nil
			}
		}
	}
	return true, nil
}

// Returns true if searchFlag appears in flags
func containsFlag(flags []maildir.Flag, searchFlag maildir.Flag) bool {
	match := false
	for _, flag := range flags {
		if searchFlag == flag {
			match = true
		}
	}
	return match
}

// Smarter version of strings.Contains for searching.
// Is case-insensitive unless substr contains an upper case character
func containsSmartCase(s string, substr string) bool {
	if hasUpper(substr) {
		return strings.Contains(s, substr)
	}
	return strings.Contains(strings.ToLower(s), strings.ToLower(substr))
}

func hasUpper(s string) bool {
	for _, r := range s {
		if unicode.IsUpper(r) {
			return true
		}
	}
	return false
}

// The parts of a message, kind of
type MsgParts int

const NONE MsgParts = 0
const (
	FLAGS MsgParts = 1 << iota
	HEADER
	BODY
	ALL
)

// Returns a bitmask of the parts of the message required to be loaded for the
// given criteria
func getRequiredParts(criteria *searchCriteria) MsgParts {
	required := NONE
	if len(criteria.Header) > 0 {
		required |= HEADER
	}
	if criteria.Body != nil && len(criteria.Body) > 0 {
		required |= BODY
	}
	if criteria.Text != nil && len(criteria.Text) > 0 {
		required |= ALL
	}
	if criteria.WithFlags != nil && len(criteria.WithFlags) > 0 {
		required |= FLAGS
	}
	if criteria.WithoutFlags != nil && len(criteria.WithoutFlags) > 0 {
		required |= FLAGS
	}

	return required
}