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
|
/*
* This file is part of GNU Taler
* (C) 2022 Taler Systems S.A.
*
* GNU Taler is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3, or (at your option) any later version.
*
* GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
package net.taler.wallet.peer
import android.util.Log
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.launch
import kotlinx.serialization.encodeToString
import kotlinx.serialization.json.Json
import net.taler.common.Amount
import net.taler.common.Timestamp
import net.taler.wallet.TAG
import net.taler.wallet.backend.TalerErrorCode.UNKNOWN
import net.taler.wallet.backend.TalerErrorInfo
import net.taler.wallet.backend.WalletBackendApi
import net.taler.wallet.exchanges.ExchangeItem
import net.taler.wallet.exchanges.ExchangeManager
import org.json.JSONObject
import java.util.concurrent.TimeUnit.HOURS
const val MAX_LENGTH_SUBJECT = 100
val DEFAULT_EXPIRY = ExpirationOption.DAYS_1
class PeerManager(
private val api: WalletBackendApi,
private val exchangeManager: ExchangeManager,
private val scope: CoroutineScope,
) {
private val _outgoingPullState = MutableStateFlow<OutgoingState>(OutgoingIntro)
val pullState: StateFlow<OutgoingState> = _outgoingPullState
private val _outgoingPushState = MutableStateFlow<OutgoingState>(OutgoingIntro)
val pushState: StateFlow<OutgoingState> = _outgoingPushState
private val _incomingPullState = MutableStateFlow<IncomingState>(IncomingChecking)
val incomingPullState: StateFlow<IncomingState> = _incomingPullState
private val _incomingPushState = MutableStateFlow<IncomingState>(IncomingChecking)
val incomingPushState: StateFlow<IncomingState> = _incomingPushState
fun checkPeerPullCredit(amount: Amount) {
_outgoingPullState.value = OutgoingChecking
scope.launch(Dispatchers.IO) {
val exchangeItem = exchangeManager.findExchange(amount.currency)
if (exchangeItem == null) {
_outgoingPullState.value = OutgoingError(
TalerErrorInfo(UNKNOWN, "No exchange found for ${amount.currency}")
)
return@launch
}
api.request("checkPeerPullCredit", CheckPeerPullCreditResponse.serializer()) {
put("exchangeBaseUrl", exchangeItem.exchangeBaseUrl)
put("amount", amount.toJSONString())
}.onSuccess {
_outgoingPullState.value = OutgoingChecked(
amountRaw = it.amountRaw,
amountEffective = it.amountEffective,
exchangeItem = exchangeItem,
)
}.onError { error ->
Log.e(TAG, "got checkPeerPullCredit error result $error")
_outgoingPullState.value = OutgoingError(error)
}
}
}
fun initiatePeerPullCredit(amount: Amount, summary: String, expirationHours: Long, exchange: ExchangeItem) {
_outgoingPullState.value = OutgoingCreating
scope.launch(Dispatchers.IO) {
val expiry = Timestamp.fromMillis(System.currentTimeMillis() + HOURS.toMillis(expirationHours))
api.request("initiatePeerPullCredit", InitiatePeerPullPaymentResponse.serializer()) {
put("exchangeBaseUrl", exchange.exchangeBaseUrl)
put("partialContractTerms", JSONObject().apply {
put("amount", amount.toJSONString())
put("summary", summary)
put("purse_expiration", JSONObject(Json.encodeToString(expiry)))
})
}.onSuccess {
_outgoingPullState.value = OutgoingResponse(it.transactionId)
}.onError { error ->
Log.e(TAG, "got initiatePeerPullCredit error result $error")
_outgoingPullState.value = OutgoingError(error)
}
}
}
fun resetPullPayment() {
_outgoingPullState.value = OutgoingIntro
}
fun checkPeerPushDebit(amount: Amount) {
_outgoingPushState.value = OutgoingChecking
scope.launch(Dispatchers.IO) {
api.request("checkPeerPushDebit", CheckPeerPushDebitResponse.serializer()) {
put("amount", amount.toJSONString())
}.onSuccess { response ->
_outgoingPushState.value = OutgoingChecked(
amountRaw = response.amountRaw,
amountEffective = response.amountEffective,
// FIXME add exchangeItem once available in API
)
}.onError { error ->
Log.e(TAG, "got checkPeerPushDebit error result $error")
_outgoingPushState.value = OutgoingError(error)
}
}
}
fun initiatePeerPushDebit(amount: Amount, summary: String, expirationHours: Long) {
_outgoingPushState.value = OutgoingCreating
scope.launch(Dispatchers.IO) {
val expiry = Timestamp.fromMillis(System.currentTimeMillis() + HOURS.toMillis(expirationHours))
api.request("initiatePeerPushDebit", InitiatePeerPushDebitResponse.serializer()) {
put("amount", amount.toJSONString())
put("partialContractTerms", JSONObject().apply {
put("amount", amount.toJSONString())
put("summary", summary)
put("purse_expiration", JSONObject(Json.encodeToString(expiry)))
})
}.onSuccess { response ->
_outgoingPushState.value = OutgoingResponse(response.transactionId)
}.onError { error ->
Log.e(TAG, "got initiatePeerPushDebit error result $error")
_outgoingPushState.value = OutgoingError(error)
}
}
}
fun resetPushPayment() {
_outgoingPushState.value = OutgoingIntro
}
fun preparePeerPullDebit(talerUri: String) {
_incomingPullState.value = IncomingChecking
scope.launch(Dispatchers.IO) {
api.request("preparePeerPullDebit", PreparePeerPullDebitResponse.serializer()) {
put("talerUri", talerUri)
}.onSuccess { response ->
_incomingPullState.value = IncomingTerms(
amountRaw = response.amountRaw,
amountEffective = response.amountEffective,
contractTerms = response.contractTerms,
id = response.transactionId,
)
}.onError { error ->
Log.e(TAG, "got preparePeerPullDebit error result $error")
_incomingPullState.value = IncomingError(error)
}
}
}
fun confirmPeerPullDebit(terms: IncomingTerms) {
_incomingPullState.value = IncomingAccepting(terms)
scope.launch(Dispatchers.IO) {
api.request<Unit>("confirmPeerPullDebit") {
put("transactionId", terms.id)
}.onSuccess {
_incomingPullState.value = IncomingAccepted
}.onError { error ->
Log.e(TAG, "got confirmPeerPullDebit error result $error")
_incomingPullState.value = IncomingError(error)
}
}
}
fun preparePeerPushCredit(talerUri: String) {
_incomingPushState.value = IncomingChecking
scope.launch(Dispatchers.IO) {
api.request("preparePeerPushCredit", PreparePeerPushCreditResponse.serializer()) {
put("talerUri", talerUri)
}.onSuccess { response ->
_incomingPushState.value = IncomingTerms(
amountRaw = response.amountRaw,
amountEffective = response.amountEffective,
contractTerms = response.contractTerms,
id = response.transactionId,
)
}.onError { error ->
Log.e(TAG, "got preparePeerPushCredit error result $error")
_incomingPushState.value = IncomingError(error)
}
}
}
fun confirmPeerPushCredit(terms: IncomingTerms) {
_incomingPushState.value = IncomingAccepting(terms)
scope.launch(Dispatchers.IO) {
api.request<Unit>("confirmPeerPushCredit") {
put("transactionId", terms.id)
}.onSuccess {
_incomingPushState.value = IncomingAccepted
}.onError { error ->
Log.e(TAG, "got confirmPeerPushCredit error result $error")
_incomingPushState.value = IncomingError(error)
}
}
}
}
|
