~singpolyma/cheogram

ref: 56e23b4519d46be8adae6f7fa018fa35fb38140e cheogram/ConfigureDirectMessageRoute.hs -rw-r--r-- 24.9 KiB
56e23b45Christopher Vollick Change JID Command 2 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
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
module ConfigureDirectMessageRoute (main, nodeName) where

import Prelude ()
import BasicPrelude hiding (log)
import Data.Foldable (toList)
import Control.Concurrent
import Control.Concurrent.STM
import Data.Time (UTCTime, diffUTCTime, getCurrentTime)
import Data.XML.Types (Element(..), Node(NodeContent, NodeElement), Name(..), Content(ContentText), isNamed, hasAttributeText, elementText, elementChildren, attributeText)
import Control.Monad.Loops (iterateM_)

import Data.Map (Map)
import qualified Data.Map as Map
import qualified Data.Text as T
import Data.UUID (UUID)
import qualified Data.UUID as UUID (toString, fromString)
import qualified Data.UUID.V1 as UUID (nextUUID)
import qualified Network.Protocol.XMPP as XMPP
import qualified Data.Bool.HT as HT
import qualified Data.XML.Types as XML

import Util
import qualified JidSwitch

newtype SessionID = SessionID UUID deriving (Ord, Eq, Show)

type GetPossibleRoute = XMPP.JID -> IO (Maybe XMPP.JID)
type GetPossibleSwitch = XMPP.JID -> IO (Maybe (XMPP.JID, XMPP.JID, XMPP.JID))
type GetRouteJid = XMPP.JID -> IO (Maybe XMPP.JID)
type SetRouteJid = XMPP.JID -> Maybe XMPP.JID -> IO ()
type ClearSwitch = XMPP.JID -> IO ()

main :: XMPP.Domain -> GetPossibleRoute -> GetPossibleSwitch -> GetRouteJid -> SetRouteJid -> ClearSwitch -> IO (XMPP.IQ -> IO (Maybe XMPP.IQ))
main componentDomain getPossibleRoute getPossibleSwitch getRouteJid setRouteJid clearSwitch = do
	stanzas <- newTQueueIO
	void $ forkIO $ iterateM_ (\sessions -> do
			(iq, reply) <- atomically (readTQueue stanzas)
			(sessions', response) <- processOneIQ componentDomain getPossibleRoute getPossibleSwitch getRouteJid setRouteJid clearSwitch sessions iq
			atomically $ reply response
			now <- getCurrentTime
			return $! Map.filter (\(_, time) -> now `diffUTCTime` time < 600) sessions'
		) Map.empty
	return (\iq -> do
			result <- atomically newEmptyTMVar
			atomically $ writeTQueue stanzas (iq, putTMVar result)
			atomically $ readTMVar result
		)

processOneIQ :: XMPP.Domain -> GetPossibleRoute -> GetPossibleSwitch -> GetRouteJid -> SetRouteJid -> ClearSwitch -> Map SessionID (Session, UTCTime) -> XMPP.IQ -> IO (Map SessionID (Session, UTCTime), Maybe XMPP.IQ)
processOneIQ componentDomain getPossibleRoute getPossibleSwitch getRouteJid setRouteJid clearSwitch sessions iq@(XMPP.IQ { XMPP.iqID = Just iqID, XMPP.iqFrom = Just from, XMPP.iqPayload = realPayload })
	| Just sid <- sessionIDFromText . snd =<< T.uncons =<< T.stripPrefix (s"ConfigureDirectMessageRoute") iqID,
          XMPP.iqType iq == XMPP.IQResult || XMPP.iqType iq == XMPP.IQError =
		(fmap Just) <$> lookupAndStepSession setRouteJid clearSwitch sessions componentDomain sid iqID from payload
	| elementName payload /= s"{http://jabber.org/protocol/commands}command" ||
	  attributeText (s"node") payload /= Just nodeName = do
		log "ConfigureDirectMessageRoute.processOneIQ BAD INPUT" (elementName payload, attributeText (s"node") payload)
		if XMPP.iqType iq == XMPP.IQError then
			return (sessions, Nothing)
		else
			return (sessions, Just $ iqError (Just iqID) (Just from) "cancel" "feature-not-implemented" Nothing)
	| Just sid <- sessionIDFromText =<< attributeText (s"sessionid") payload =
		(fmap Just) <$> lookupAndStepSession setRouteJid clearSwitch sessions componentDomain sid iqID from payload
	| otherwise = do
		now <- getCurrentTime
		existingRoute <- getRouteJid from
		possibleRoute <- getPossibleRoute from
		possibleSwitch <- getPossibleSwitch from
		case possibleSwitch of
			Just (newJid, switchJid, switchRoute) -> do
				(sid, session) <- newSession $ switchStage2 switchJid switchRoute possibleRoute existingRoute
				return (Map.insert sid (session, now) sessions, Just $ switchStage1 newJid switchJid switchRoute possibleRoute existingRoute from iqID sid)
			_ -> do
				(sid, session) <- newSession stage2
				return (Map.insert sid (session, now) sessions, Just $ stage1 possibleRoute existingRoute from iqID sid)
	where
	payload
		| Just p <- realPayload,
		  XMPP.iqType iq == XMPP.IQError && elementName p == s"{jabber:component:accept}error" = p
		| XMPP.iqType iq == XMPP.IQError =
			let Just p = XMPP.iqPayload $ iqError Nothing Nothing "cancel" "internal-server-error" Nothing in p
		| otherwise = fromMaybe (Element (s"no-payload") [] []) realPayload
processOneIQ _ _ _ _ _ _ sessions iq@(XMPP.IQ { XMPP.iqID = iqID, XMPP.iqFrom = from }) = do
	log "ConfigureDirectMessageRoute.processOneIQ BAD INPUT" iq
	return (sessions, Just $ iqError iqID from "cancel" "feature-not-implemented" Nothing)

lookupAndStepSession :: SetRouteJid -> ClearSwitch -> Map SessionID (Session, UTCTime) -> Session' (IO (Map SessionID (Session, UTCTime), XMPP.IQ))
lookupAndStepSession setRouteJid clearSwitch sessions componentDomain sid iqID from payload
	| Just (stepSession, _) <- Map.lookup sid sessions =
		case attributeText (s"action") payload of
			Just action | action == s"cancel" ->
				return (Map.delete sid sessions, (XMPP.emptyIQ XMPP.IQResult) {
					XMPP.iqID = Just iqID,
					XMPP.iqTo = Just from,
					XMPP.iqPayload = Just $ Element (s"{http://jabber.org/protocol/commands}command")
						[
							(s"{http://jabber.org/protocol/commands}node", [ContentText nodeName]),
							(s"{http://jabber.org/protocol/commands}sessionid", [ContentText $ sessionIDToText sid]),
							(s"{http://jabber.org/protocol/commands}status", [ContentText $ s"canceled"])
						] [
							NodeElement $ Element (s"{http://jabber.org/protocol/commands}note") [
								(s"{http://jabber.org/protocol/commands}type", [ContentText $ s"info"])
							] [
								NodeContent $ ContentText $ s"Register cancelled"
							]
						]
				})
			Just action | action == s"complete" ->
				return (Map.delete sid sessions, (XMPP.emptyIQ XMPP.IQResult) {
					XMPP.iqID = Just iqID,
					XMPP.iqTo = Just from,
					XMPP.iqPayload = Just $ Element (s"{http://jabber.org/protocol/commands}command")
						[
							(s"{http://jabber.org/protocol/commands}node", [ContentText nodeName]),
							(s"{http://jabber.org/protocol/commands}sessionid", [ContentText $ sessionIDToText sid]),
							(s"{http://jabber.org/protocol/commands}status", [ContentText $ s"completed"])
						] [
							NodeElement $ Element (s"{http://jabber.org/protocol/commands}note") [
								(s"{http://jabber.org/protocol/commands}type", [ContentText $ s"info"])
							] [
								NodeContent $ ContentText $ s"Saved route configuration."
							]
						]
				})
			_ ->
				let (session', iq) = stepSession componentDomain sid iqID from payload in
				fmap (flip (,) iq) $ case session' of
					SessionNext s -> do
						now <- getCurrentTime
						return $! Map.insert sid (s, now) sessions
					SessionCancel -> return $! Map.delete sid sessions
					SessionSaveAndNext userJid gatewayJid s -> do
						now <- getCurrentTime
						userJid `setRouteJid` (Just gatewayJid)
						return $! Map.insert sid (s, now) sessions
					SessionClearSwitchAndNext userJid s -> do
						now <- getCurrentTime
						clearSwitch userJid
						return $! Map.insert sid (s, now) sessions
					SessionCompleteSwitch userJid oldJid gatewayJid -> do
						userJid `setRouteJid` Just gatewayJid
						oldJid `setRouteJid` Nothing
						clearSwitch userJid
						return $! Map.delete sid sessions
					SessionComplete userJid gatewayJid -> do
						userJid `setRouteJid` gatewayJid
						return $! Map.delete sid sessions
	| otherwise = do
		log "ConfigureDirectMessageRoute.processOneIQ NO SESSION FOUND" (sid, iqID, from, payload)
		return (sessions, iqError (Just iqID) (Just from) "modify" "bad-request" (Just "bad-sessionid"))

data SessionResult = SessionNext Session | SessionCancel | SessionSaveAndNext XMPP.JID XMPP.JID Session | SessionClearSwitchAndNext XMPP.JID Session | SessionCompleteSwitch XMPP.JID XMPP.JID XMPP.JID | SessionComplete XMPP.JID (Maybe XMPP.JID)
type Session' a = XMPP.Domain -> SessionID -> Text -> XMPP.JID -> Element -> a
type Session = Session' (SessionResult, XMPP.IQ)

data RegisterFormType = DataForm | LegacyRegistration

stage5 :: Text -> XMPP.JID -> Session
stage5 stage4iqID stage4from _ sid iqID from error
	| elementName error == s"{jabber:component:accept}error" =
		(SessionCancel, (XMPP.emptyIQ XMPP.IQError) {
			XMPP.iqID = Just stage4iqID,
			XMPP.iqTo = Just stage4from,
			XMPP.iqPayload = Just error
		})
	| otherwise =
		(SessionComplete stage4from (Just from), (XMPP.emptyIQ XMPP.IQResult) {
			XMPP.iqID = Just stage4iqID,
			XMPP.iqTo = Just stage4from,
			XMPP.iqPayload = Just $ Element (s"{http://jabber.org/protocol/commands}command")
				[
					(s"{http://jabber.org/protocol/commands}node", [ContentText nodeName]),
					(s"{http://jabber.org/protocol/commands}sessionid", [ContentText $ sessionIDToText sid]),
					(s"{http://jabber.org/protocol/commands}status", [ContentText $ s"completed"])
				]
				[
					NodeElement $ Element (s"{http://jabber.org/protocol/commands}note") [
						(s"{http://jabber.org/protocol/commands}type", [ContentText $ s"info"])
					] [
						NodeContent $ ContentText $ s"Registration complete."
					]
				]
		})

stage4 :: RegisterFormType -> XMPP.JID -> Session
stage4 formType gatewayJid componentDomain sid iqID from command
	| [form] <- isNamed (fromString "{jabber:x:data}x") =<< elementChildren command =
		(SessionNext $ stage5 iqID from, (XMPP.emptyIQ XMPP.IQSet) {
			XMPP.iqID = Just (s"ConfigureDirectMessageRoute4" ++ sessionIDToText sid),
			XMPP.iqTo = Just gatewayJid,
			XMPP.iqFrom = Just sendFrom, -- domain gets rewritten by main cheogram program
			XMPP.iqPayload = Just $
				case formType of
					DataForm -> Element (s"{jabber:iq:register}query") [] [NodeElement form]
					LegacyRegistration -> convertFormToLegacyRegistration form
		})
	| otherwise = (SessionCancel, iqError (Just iqID) (Just from) "modify" "bad-request" (Just "bad-payload"))
	where
	sendFrom = sendFromForBackend componentDomain from

stage3 :: Text -> XMPP.JID -> Session
stage3 stage2iqID stage2from _ sid iqID from query
	| elementName query == s"{jabber:component:accept}error" =
		(SessionCancel, (XMPP.emptyIQ XMPP.IQError) {
			XMPP.iqID = Just stage2iqID,
			XMPP.iqTo = Just stage2from,
			XMPP.iqPayload = Just query
		})
	| [form] <- isNamed (fromString "{jabber:x:data}x") =<< elementChildren query = processForm DataForm form
	| otherwise = processForm LegacyRegistration (convertQueryToForm query)
	where
	registered = not $ null $ isNamed (fromString "{jabber:iq:register}registered") =<< elementChildren query
	sessionNext
		| registered =
			SessionSaveAndNext stage2from from
		| otherwise = SessionNext
	processForm typ form =
		(sessionNext $ stage4 typ from, (XMPP.emptyIQ XMPP.IQResult) {
			XMPP.iqID = Just stage2iqID,
			XMPP.iqTo = Just stage2from,
			XMPP.iqPayload = Just $ commandStage sid registered form
		})

stage2 :: Session
stage2 componentDomain sid iqID from command
	| [form] <- isNamed (fromString "{jabber:x:data}x") =<< elementChildren command,
	  Just gatewayJid <- XMPP.parseJID =<< getFormField form (s"gateway-jid"),
	  XMPP.jidNode gatewayJid == Nothing && XMPP.jidResource gatewayJid == Nothing =
		(
			SessionNext $ commandOrIBR gatewayJid,
			(queryCommandList' gatewayJid sendFrom) {
				XMPP.iqID = Just (s"ConfigureDirectMessageRoute2" ++ sessionIDToText sid)
			}
		)
	| [form] <- isNamed (fromString "{jabber:x:data}x") =<< elementChildren command,
	  getFormField form (s"gateway-jid") `elem` [Nothing, Just mempty] =
		(SessionComplete from Nothing, (XMPP.emptyIQ XMPP.IQResult) {
			XMPP.iqID = Just iqID,
			XMPP.iqTo = Just from,
			XMPP.iqPayload = Just $ Element (s"{http://jabber.org/protocol/commands}command")
				[
					(s"{http://jabber.org/protocol/commands}node", [ContentText nodeName]),
					(s"{http://jabber.org/protocol/commands}sessionid", [ContentText $ sessionIDToText sid]),
					(s"{http://jabber.org/protocol/commands}status", [ContentText $ s"completed"])
				]
				[
					NodeElement $ Element (s"{http://jabber.org/protocol/commands}note") [
						(s"{http://jabber.org/protocol/commands}type", [ContentText $ s"info"])
					] [
						NodeContent $ ContentText $ s"Direct message route removed."
					]
				]
		})
	| otherwise = (SessionCancel, iqError (Just iqID) (Just from) "modify" "bad-request" (Just "bad-payload"))
	where
	sendFrom = sendFromForBackend componentDomain from
	commandOrIBR gatewayJid _ _ _ _ command'
		| (s"jabber:iq:register") `elem` mapMaybe (attributeText (s"node")) (isNamed (s"{http://jabber.org/protocol/disco#items}item") =<< elementChildren command') =
			(SessionNext $ proxyAdHocFromGateway iqID from, (XMPP.emptyIQ XMPP.IQSet) {
				XMPP.iqID = Just (s"ConfigureDirectMessageRoute2" ++ sessionIDToText sid),
				XMPP.iqTo = Just gatewayJid,
				XMPP.iqFrom = Just sendFrom,
				XMPP.iqPayload = Just $ Element (s"{http://jabber.org/protocol/commands}command") [(s"node", [ContentText $ s"jabber:iq:register"])] []
			})
		| otherwise =
			(SessionNext $ stage3 iqID from, (XMPP.emptyIQ XMPP.IQGet) {
				XMPP.iqID = Just (s"ConfigureDirectMessageRoute2" ++ sessionIDToText sid),
				XMPP.iqTo = Just gatewayJid,
				XMPP.iqFrom = Just sendFrom, -- domain gets rewritten by main cheogram program
				XMPP.iqPayload = Just $ Element (s"{jabber:iq:register}query") [] []
			})

proxyAdHocFromGateway :: Text -> XMPP.JID -> Session
proxyAdHocFromGateway prevIqID userJid _ sid iqID from command
	| attributeText (s"status") command == Just (s"canceled") = (SessionCancel, proxied)
	| attributeText (s"status") command == Just (s"completed") =
		if (s"error") `elem` mapMaybe (attributeText (s"type")) (XML.isNamed (s"{http://jabber.org/protocol/commands}note") =<< XML.elementChildren command) then
			(SessionCancel, proxied)
		else
			(
				SessionComplete userJid (Just from),
				proxied {
					XMPP.iqPayload = fmap (\elem ->
						elem {
							XML.elementNodes = XML.elementNodes elem ++ [
								XML.NodeElement $ XML.Element (s"{http://jabber.org/protocol/commands}note")
									[(s"type", [XML.ContentText $ s"info"])]
									[XML.NodeContent $ XML.ContentText $ s"Registration complete."]
							]
						}
					) (XMPP.iqPayload proxied)
				}
			)
	| otherwise = (SessionNext $ proxyAdHocFromUser iqID otherSID from, proxied)
	where
	proxied =
		(XMPP.emptyIQ XMPP.IQResult) {
			XMPP.iqID = Just prevIqID,
			XMPP.iqTo = Just userJid,
			XMPP.iqPayload = Just $ command {
				XML.elementAttributes = map (\attr@(name, _) ->
					HT.select attr [
						(name == s"node", (name, [ContentText nodeName])),
						(name == s"sessionid", (name, [ContentText $ sessionIDToText sid]))
					]
				) (XML.elementAttributes command)
			}
		}
	otherSID = fromMaybe mempty $ XML.attributeText (s"sessionid") command

proxyAdHocFromUser :: Text -> Text -> XMPP.JID -> Session
proxyAdHocFromUser prevIqID otherSID gatewayJid componentDomain _ iqID from command = (
		SessionNext $ proxyAdHocFromGateway iqID from,
		(XMPP.emptyIQ XMPP.IQSet) {
			XMPP.iqID = Just prevIqID,
			XMPP.iqTo = Just gatewayJid,
			XMPP.iqFrom = Just sendFrom,
			XMPP.iqPayload = Just $ command {
				XML.elementAttributes = map (\attr@(name, _) ->
					HT.select attr [
						(name == s"node", (name, [s"jabber:iq:register"])),
						(name == s"sessionid", (name, [ContentText otherSID]))
					]
				) (XML.elementAttributes command)
			}
		}
	)
	where
	sendFrom = sendFromForBackend componentDomain from

switchStage1 :: XMPP.JID -> XMPP.JID -> XMPP.JID -> Maybe XMPP.JID -> Maybe XMPP.JID -> XMPP.JID -> Text -> SessionID -> XMPP.IQ
switchStage1 newJid switchJid switchRoute possibleRoute existingRoute iqTo iqID sid = (XMPP.emptyIQ XMPP.IQResult) {
	XMPP.iqTo = Just iqTo,
	XMPP.iqID = Just iqID,
	XMPP.iqPayload = Just $ commandStage sid False $
		Element (fromString "{jabber:x:data}x") [
			(fromString "{jabber:x:data}type", [ContentText $ s"form"])
		] [
			NodeElement $ Element (fromString "{jabber:x:data}title") [] [NodeContent $ ContentText $ s"Accept Jabber ID Change"],
			NodeElement $ Element (fromString "{jabber:x:data}instructions") [] [
				NodeContent $ ContentText $ concat [
					s"It appears that the Jabber ID \"",
					bareTxt switchJid,
					s"\" has requested a migration to this Jabber ID (",
					bareTxt newJid,
					s"). If this isn't expected, respond no to the following to register normally"
				]
			],
			NodeElement $ Element (fromString "{jabber:x:data}field") [
				(fromString "{jabber:x:data}type", [ContentText $ s"boolean"]),
				(fromString "{jabber:x:data}var", [ContentText $ s"confirm"]),
				(fromString "{jabber:x:data}label", [ContentText $ s"Do you accept the migration?"])
			] []
		]
}

switchStage2 :: XMPP.JID -> XMPP.JID -> Maybe XMPP.JID -> Maybe XMPP.JID -> Session
switchStage2 switchJid switchRoute possibleRoute existingRoute componentDomain sid iqID from command
	| [form] <- isNamed (fromString "{jabber:x:data}x") =<< elementChildren command,
	  Just True <- parseBool =<< getFormField form (s"confirm") =
		(
			SessionNext $ switchStage3 switchJid switchRoute iqID from,
			(XMPP.emptyIQ XMPP.IQSet) {
				XMPP.iqID = Just (s"ConfigureDirectMessageRoute2" ++ sessionIDToText sid),
				XMPP.iqTo = Just switchRoute,
				XMPP.iqFrom = Just $ sendFromForBackend componentDomain switchJid,
				XMPP.iqPayload = Just $ Element (s"{http://jabber.org/protocol/commands}command") [(s"node", [ContentText JidSwitch.backendNodeName])] []
			}
		)
	| otherwise =
		(
			SessionClearSwitchAndNext from stage2,
			stage1 possibleRoute existingRoute from iqID sid
		)

switchStage3 :: XMPP.JID -> XMPP.JID -> Text -> XMPP.JID -> Session
switchStage3 switchJid switchRoute stage2ID stage2From componentDomain sid iqID from command
	| Just backendSid <- attributeText (s"sessionid") command,
	  [form] <- isNamed (fromString "{jabber:x:data}x") =<< elementChildren command,
	  isJust $ getFormField form $ s"jid" =
		(
			SessionNext $ switchStage4 switchJid switchRoute stage2ID stage2From,
			(XMPP.emptyIQ XMPP.IQSet) {
				XMPP.iqTo = Just from,
				XMPP.iqFrom = Just $ sendFromForBackend componentDomain switchJid,
				XMPP.iqID = Just (s"ConfigureDirectMessageRoute3" ++ sessionIDToText sid),
				XMPP.iqPayload = Just $ Element (s"{http://jabber.org/protocol/commands}command") [
						(s"node", [ContentText JidSwitch.backendNodeName]),
						(s"sessionid", [ContentText $ backendSid])
					] [
						NodeElement $ Element (fromString "{jabber:x:data}x") [
							(fromString "{jabber:x:data}type", [ContentText $ s"submit"])
						] [
							NodeElement $ Element (fromString "{jabber:x:data}field") [
								(fromString "{jabber:x:data}var", [ContentText $ s"jid"])
							] [
								NodeElement $ Element (fromString "{jabber:x:data}value") [] [NodeContent $ ContentText $ bareTxt stage2From]
							]
						]
					]
			}
			)
	| otherwise = (SessionCancel, iqError (Just stage2ID) (Just stage2From) "cancel" "internal-server-error" Nothing)

switchStage4 :: XMPP.JID -> XMPP.JID -> Text -> XMPP.JID -> Session
switchStage4 switchJid switchRoute stage2ID stage2From componentDomain sid iqID from command
	| attributeText (s"status") command == Just (s"canceled") = (SessionCancel, proxied)
	| attributeText (s"status") command == Just (s"completed") =
		if (s"error") `elem` mapMaybe (attributeText (s"type")) (XML.isNamed (s"{http://jabber.org/protocol/commands}note") =<< XML.elementChildren command) then
			(SessionCancel, proxied)
		else
			(SessionCompleteSwitch stage2From switchJid switchRoute, proxied)
	where
	proxied =
		(XMPP.emptyIQ XMPP.IQResult) {
			XMPP.iqID = Just stage2ID,
			XMPP.iqTo = Just stage2From,
			XMPP.iqPayload = Just $ command {
				XML.elementAttributes = map (\attr@(name, _) ->
					HT.select attr [
						(name == s"node", (name, [ContentText nodeName])),
						(name == s"sessionid", (name, [ContentText $ sessionIDToText sid]))
					]
				) (XML.elementAttributes command)
			}
		}

stage1 :: Maybe XMPP.JID -> Maybe XMPP.JID -> XMPP.JID -> Text -> SessionID -> XMPP.IQ
stage1 possibleRoute existingRoute iqTo iqID sid = (XMPP.emptyIQ XMPP.IQResult) {
	XMPP.iqTo = Just iqTo,
	XMPP.iqID = Just iqID,
	XMPP.iqPayload = Just $ commandStage sid False $
		Element (fromString "{jabber:x:data}x") [
			(fromString "{jabber:x:data}type", [ContentText $ s"form"])
		] (catMaybes [
			Just $ NodeElement $ Element (fromString "{jabber:x:data}title") [] [NodeContent $ ContentText $ s"Configure Direct Message Route"],
			Just $ NodeElement $ Element (fromString "{jabber:x:data}instructions") [] [
				NodeContent $ ContentText $ s"Enter the gateway to use for routing your direct messages over SMS."
			],
			flip fmap possibleRoute $ \route -> NodeElement $ Element (fromString "{jabber:x:data}instructions") [] [
				NodeContent $ ContentText $ s"To continue your registration with " ++ XMPP.formatJID route ++ s" please enter " ++ XMPP.formatJID route
			],
			Just $ NodeElement $ Element (fromString "{jabber:x:data}field") [
				(fromString "{jabber:x:data}type", [ContentText $ s"jid-single"]),
				(fromString "{jabber:x:data}var", [ContentText $ s"gateway-jid"]),
				(fromString "{jabber:x:data}label", [ContentText $ s"Gateway"])
			] [
				NodeElement $ Element (fromString "{jabber:x:data}value") [] [NodeContent $ ContentText $ maybe mempty XMPP.formatJID existingRoute]
			]
		])
}

sendFromForBackend :: XMPP.Domain -> XMPP.JID -> XMPP.JID
sendFromForBackend componentDomain from
	| XMPP.jidDomain from == componentDomain = from
	| otherwise = sendFrom
	where
	Just sendFrom = XMPP.parseJID $ (escapeJid $ bareTxt from) ++ s"@" ++ XMPP.strDomain componentDomain

commandStage :: SessionID -> Bool -> Element -> Element
commandStage sid allowComplete el = Element (s"{http://jabber.org/protocol/commands}command")
	[
		(s"{http://jabber.org/protocol/commands}node", [ContentText nodeName]),
		(s"{http://jabber.org/protocol/commands}sessionid", [ContentText $ sessionIDToText sid]),
		(s"{http://jabber.org/protocol/commands}status", [ContentText $ s"executing"])
	]
	[
		NodeElement actions,
		NodeElement el
	]
	where
	actions
		| allowComplete =
			Element (s"{http://jabber.org/protocol/commands}actions") [
				(s"{http://jabber.org/protocol/commands}execute", [ContentText $ s"complete"])
			] [
				NodeElement $ Element (s"{http://jabber.org/protocol/commands}next") [] [],
				NodeElement $ Element (s"{http://jabber.org/protocol/commands}complete") [] []
			]
		| otherwise =
			Element (s"{http://jabber.org/protocol/commands}actions") [
				(s"{http://jabber.org/protocol/commands}execute", [ContentText $ s"next"])
			] [
				NodeElement $ Element (s"{http://jabber.org/protocol/commands}next") [] []
			]

newSession :: Session -> IO (SessionID, Session)
newSession nextStage = UUID.nextUUID >>= go
	where
	go (Just uuid) = return (SessionID uuid, nextStage)
	go Nothing = do
		log "ConfigureDirectMessageRoute.newSession" "UUID generation failed"
		UUID.nextUUID >>= go

sessionIDFromText :: Text -> Maybe SessionID
sessionIDFromText txt = SessionID <$> UUID.fromString (textToString txt)

sessionIDToText :: SessionID -> Text
sessionIDToText (SessionID uuid) = fromString $ UUID.toString uuid

nodeName :: Text
nodeName = s"register"

iqError :: Maybe Text -> Maybe XMPP.JID -> String -> String -> Maybe String -> XMPP.IQ
iqError iqID to typ xmpp command = (XMPP.emptyIQ XMPP.IQError) {
	XMPP.iqID = iqID,
	XMPP.iqTo = to,
	XMPP.iqPayload = Just $
		Element (s"{jabber:component:accept}error")
			[(s"{jabber:component:accept}type", [ContentText $ fromString typ])]
			(
				(NodeElement $ Element (fromString $ "{urn:ietf:params:xml:ns:xmpp-stanzas}" ++ xmpp) [] []) :
				map (\name ->
					NodeElement $ Element (fromString $ "{http://jabber.org/protocol/commands}" ++ name) [] []
				) (toList command)
			)
}

convertFormToLegacyRegistration :: Element -> Element
convertFormToLegacyRegistration form =
	Element (s"{jabber:iq:register}query") [] $
	map (NodeElement . uncurry legacyEl . varAndValue) fields
	where
	legacyEl var value = Element (fromString $ "{jabber:iq:register}" ++ T.unpack var) [] [NodeContent $ ContentText value]
	varAndValue field = (
			fromMaybe mempty $ attributeText (s"var") field,
			mconcat $ elementText =<< isNamed (s"{jabber:x:data}value") =<< elementChildren field
		)
	fields = isNamed (s"{jabber:x:data}field") =<< elementChildren form

convertQueryToForm :: Element -> Element
convertQueryToForm query =
	Element (s"{jabber:x:data}x") [
			(s"{jabber:x:data}type", [ContentText $ s"form"])
		] ([
			NodeElement $ Element (fromString "{jabber:x:data}title") [] [NodeContent $ ContentText $ s"Register"],
			NodeElement $ Element (fromString "{jabber:x:data}instructions") [] [NodeContent $ ContentText instructions]
		] ++ map (NodeElement . uncurry field) vars)
	where
	field var text =
		Element (fromString "{jabber:x:data}field") [
			(s"{jabber:x:data}type", [ContentText $ if var == s"password" then s"text-private" else s"text-single"]),
			(s"{jabber:x:data}var", [ContentText var]),
			(s"{jabber:x:data}label", [ContentText var])
		] [
			NodeElement $ Element (fromString "{jabber:x:data}value") [] [NodeContent $ ContentText text]
		]
	instructions = mconcat $ elementText =<< isNamed (s"{jabber:iq:register}instructions") =<< elementChildren query
	vars =
		map snd $
		filter (\(ns, (var, _)) -> ns == s"jabber:iq:register" && var `notElem` [s"registered", s"instructions"]) $
		mapMaybe (\el -> let name = elementName el in (,) <$> nameNamespace name <*> pure (nameLocalName name, mconcat $ elementText el)) $
		elementChildren query