~sircmpwn/aerc

ref: 282dc44aa67773b608cace43587ecd2c140689a4 aerc/worker/imap/worker.go -rw-r--r-- 6.1 KiB View raw
282dc44aJeffas Check the subject line for lowercase re 6 months 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
251
252
253
254
255
256
package imap

import (
	"crypto/tls"
	"fmt"
	"net/url"
	"strings"

	"github.com/emersion/go-imap"
	idle "github.com/emersion/go-imap-idle"
	"github.com/emersion/go-imap/client"
	"golang.org/x/oauth2"

	"git.sr.ht/~sircmpwn/aerc/lib"
	"git.sr.ht/~sircmpwn/aerc/models"
	"git.sr.ht/~sircmpwn/aerc/worker/handlers"
	"git.sr.ht/~sircmpwn/aerc/worker/types"
)

func init() {
	handlers.RegisterWorkerFactory("imap", NewIMAPWorker)
	handlers.RegisterWorkerFactory("imaps", NewIMAPWorker)
}

var errUnsupported = fmt.Errorf("unsupported command")

type imapClient struct {
	*client.Client
	idle *idle.IdleClient
}

type IMAPWorker struct {
	config struct {
		scheme      string
		insecure    bool
		addr        string
		user        *url.Userinfo
		folders     []string
		oauthBearer lib.OAuthBearer
	}

	client   *imapClient
	idleStop chan struct{}
	idleDone chan error
	selected *imap.MailboxStatus
	updates  chan client.Update
	worker   *types.Worker
	// Map of sequence numbers to UIDs, index 0 is seq number 1
	seqMap []uint32
}

func NewIMAPWorker(worker *types.Worker) (types.Backend, error) {
	return &IMAPWorker{
		idleDone: make(chan error),
		updates:  make(chan client.Update, 50),
		worker:   worker,
		selected: &imap.MailboxStatus{},
	}, nil
}

func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
	if w.idleStop != nil {
		close(w.idleStop)
		if err := <-w.idleDone; err != nil {
			w.worker.PostMessage(&types.Error{Error: err}, nil)
		}
	}

	switch msg := msg.(type) {
	case *types.Unsupported:
		// No-op
	case *types.Configure:
		u, err := url.Parse(msg.Config.Source)
		if err != nil {
			return err
		}

		w.config.scheme = u.Scheme
		if strings.HasSuffix(w.config.scheme, "+insecure") {
			w.config.scheme = strings.TrimSuffix(w.config.scheme, "+insecure")
			w.config.insecure = true
		}

		if strings.HasSuffix(w.config.scheme, "+oauthbearer") {
			w.config.scheme = strings.TrimSuffix(w.config.scheme, "+oauthbearer")
			w.config.oauthBearer.Enabled = true
			q := u.Query()
			if q.Get("token_endpoint") != "" {
				w.config.oauthBearer.OAuth2 = &oauth2.Config{
					ClientID:     q.Get("client_id"),
					ClientSecret: q.Get("client_secret"),
					Scopes:       []string{q.Get("scope")},
				}
				w.config.oauthBearer.OAuth2.Endpoint.TokenURL = q.Get("token_endpoint")
			}
		}

		w.config.addr = u.Host
		if !strings.ContainsRune(w.config.addr, ':') {
			w.config.addr += ":" + w.config.scheme
		}

		w.config.user = u.User
		w.config.folders = msg.Config.Folders
	case *types.Connect:
		var (
			c   *client.Client
			err error
		)
		switch w.config.scheme {
		case "imap":
			c, err = client.Dial(w.config.addr)
			if err != nil {
				return err
			}

			if !w.config.insecure {
				if err := c.StartTLS(&tls.Config{}); err != nil {
					return err
				}
			}
		case "imaps":
			c, err = client.DialTLS(w.config.addr, &tls.Config{})
			if err != nil {
				return err
			}
		default:
			return fmt.Errorf("Unknown IMAP scheme %s", w.config.scheme)
		}
		c.ErrorLog = w.worker.Logger

		if w.config.user != nil {
			username := w.config.user.Username()
			password, hasPassword := w.config.user.Password()
			if !hasPassword {
				// TODO: ask password
			}

			if w.config.oauthBearer.Enabled {
				if err := w.config.oauthBearer.Authenticate(username, password, c); err != nil {
					return err
				}
			} else if err := c.Login(username, password); err != nil {
				return err
			}
		}

		c.SetDebug(w.worker.Logger.Writer())

		if _, err := c.Select(imap.InboxName, false); err != nil {
			return err
		}

		c.Updates = w.updates
		w.client = &imapClient{c, idle.NewClient(c)}
		w.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
	case *types.ListDirectories:
		w.handleListDirectories(msg)
	case *types.OpenDirectory:
		w.handleOpenDirectory(msg)
	case *types.FetchDirectoryContents:
		w.handleFetchDirectoryContents(msg)
	case *types.CreateDirectory:
		w.handleCreateDirectory(msg)
	case *types.FetchMessageHeaders:
		w.handleFetchMessageHeaders(msg)
	case *types.FetchMessageBodyPart:
		w.handleFetchMessageBodyPart(msg)
	case *types.FetchFullMessages:
		w.handleFetchFullMessages(msg)
	case *types.DeleteMessages:
		w.handleDeleteMessages(msg)
	case *types.ReadMessages:
		w.handleReadMessages(msg)
	case *types.CopyMessages:
		w.handleCopyMessages(msg)
	case *types.AppendMessage:
		w.handleAppendMessage(msg)
	case *types.SearchDirectory:
		w.handleSearchDirectory(msg)
	default:
		return errUnsupported
	}

	if w.idleStop != nil {
		w.idleStop = make(chan struct{})
		go func() {
			w.idleDone <- w.client.idle.IdleWithFallback(w.idleStop, 0)
		}()
	}
	return nil
}

func (w *IMAPWorker) handleImapUpdate(update client.Update) {
	w.worker.Logger.Printf("(= %T", update)
	switch update := update.(type) {
	case *client.MailboxUpdate:
		status := update.Mailbox
		if w.selected.Name == status.Name {
			w.selected = status
		}
		w.worker.PostMessage(&types.DirectoryInfo{
			Info: &models.DirectoryInfo{
				Flags:    status.Flags,
				Name:     status.Name,
				ReadOnly: status.ReadOnly,

				Exists: int(status.Messages),
				Recent: int(status.Recent),
				Unseen: int(status.Unseen),
			},
		}, nil)
	case *client.MessageUpdate:
		msg := update.Message
		if msg.Uid == 0 {
			msg.Uid = w.seqMap[msg.SeqNum-1]
		}
		w.worker.PostMessage(&types.MessageInfo{
			Info: &models.MessageInfo{
				BodyStructure: translateBodyStructure(msg.BodyStructure),
				Envelope:      translateEnvelope(msg.Envelope),
				Flags:         translateFlags(msg.Flags),
				InternalDate:  msg.InternalDate,
				Uid:           msg.Uid,
			},
		}, nil)
	case *client.ExpungeUpdate:
		i := update.SeqNum - 1
		uid := w.seqMap[i]
		w.seqMap = append(w.seqMap[:i], w.seqMap[i+1:]...)
		w.worker.PostMessage(&types.MessagesDeleted{
			Uids: []uint32{uid},
		}, nil)
	}
}

func (w *IMAPWorker) Run() {
	for {
		select {
		case msg := <-w.worker.Actions:
			msg = w.worker.ProcessAction(msg)
			if err := w.handleMessage(msg); err == errUnsupported {
				w.worker.PostMessage(&types.Unsupported{
					Message: types.RespondTo(msg),
				}, nil)
			} else if err != nil {
				w.worker.PostMessage(&types.Error{
					Message: types.RespondTo(msg),
					Error:   err,
				}, nil)
			}
		case update := <-w.updates:
			w.handleImapUpdate(update)
		}
	}
}