aboutsummaryrefslogtreecommitdiff
path: root/packages/taler-util/src/bank-api-client.ts
blob: 642232962a1df5b0e4825b41c7ddd298c30e07fe (plain)
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
/*
 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/>
 */

/**
 * Client for the Taler (demo-)bank.
 */

/**
 * Imports.
 */
import {
  AccountData,
  AmountString,
  base64FromArrayBuffer,
  buildCodecForObject,
  Codec,
  codecForAny,
  codecForString,
  encodeCrock,
  getRandomBytes,
  HttpStatusCode,
  j2s,
  Logger,
  opEmptySuccess,
  opKnownHttpFailure,
  opUnknownFailure,
  RegisterAccountRequest,
  stringToBytes,
  TalerError,
  TalerErrorCode,
} from "@gnu-taler/taler-util";
import {
  checkSuccessResponseOrThrow,
  createPlatformHttpLib,
  expectSuccessResponseOrThrow,
  HttpRequestLibrary,
  readSuccessResponseJsonOrThrow,
  readTalerErrorResponse,
} from "@gnu-taler/taler-util/http";

const logger = new Logger("bank-api-client.ts");

export enum CreditDebitIndicator {
  Credit = "credit",
  Debit = "debit",
}

export interface BankAccountBalanceResponse {
  balance: {
    amount: AmountString;
    credit_debit_indicator: CreditDebitIndicator;
  };
}

export interface BankUser {
  username: string;
  password: string;
  accountPaytoUri: string;
}

export interface WithdrawalOperationInfo {
  withdrawal_id: string;
  taler_withdraw_uri: string;
}

/**
 * Helper function to generate the "Authorization" HTTP header.
 */
function makeBasicAuthHeader(username: string, password: string): string {
  const auth = `${username}:${password}`;
  const authEncoded: string = base64FromArrayBuffer(stringToBytes(auth));
  return `Basic ${authEncoded}`;
}

const codecForWithdrawalOperationInfo = (): Codec<WithdrawalOperationInfo> =>
  buildCodecForObject<WithdrawalOperationInfo>()
    .property("withdrawal_id", codecForString())
    .property("taler_withdraw_uri", codecForString())
    .build("WithdrawalOperationInfo");

export interface BankAccessApiClientArgs {
  auth?: { username: string; password: string };
  httpClient?: HttpRequestLibrary;
}

export interface BankAccessApiCreateTransactionRequest {
  amount: AmountString;
  paytoUri: string;
}

export class WireGatewayApiClientArgs {
  auth?: {
    username: string;
    password: string;
  };
  httpClient?: HttpRequestLibrary;
}

/**
 * This API look like it belongs to harness
 * but it will be nice to have in utils to be used by others
 */
export class WireGatewayApiClient {
  httpLib;

  constructor(
    private baseUrl: string,
    private args: WireGatewayApiClientArgs = {},
  ) {
    this.httpLib = args.httpClient ?? createPlatformHttpLib();
  }

  private makeAuthHeader(): Record<string, string> {
    const auth = this.args.auth;
    if (auth) {
      return {
        Authorization: makeBasicAuthHeader(auth.username, auth.password),
      };
    }
    return {};
  }

  async adminAddIncoming(params: {
    amount: string;
    reservePub: string;
    debitAccountPayto: string;
  }): Promise<void> {
    let url = new URL(`admin/add-incoming`, this.baseUrl);
    const resp = await this.httpLib.fetch(url.href, {
      method: "POST",
      body: {
        amount: params.amount,
        reserve_pub: params.reservePub,
        debit_account: params.debitAccountPayto,
      },
      headers: this.makeAuthHeader(),
    });
    logger.info(`add-incoming response status: ${resp.status}`);
    await checkSuccessResponseOrThrow(resp);
  }
}

export interface AccountBalance {
  amount: AmountString;
  credit_debit_indicator: "credit" | "debit";
}

export interface ConfirmWithdrawalArgs {
  withdrawalOperationId: string;
}

/**
 * Client for the Taler corebank API.
 */
export class TalerCorebankApiClient {
  httpLib: HttpRequestLibrary;

  constructor(
    public baseUrl: string,
    private args: BankAccessApiClientArgs = {},
  ) {
    this.httpLib = args.httpClient ?? createPlatformHttpLib();
  }

  setAuth(auth: { username: string; password: string }) {
    this.args.auth = auth;
  }

  private makeAuthHeader(): Record<string, string> {
    if (!this.args.auth) {
      return {};
    }
    const authHeaderValue = makeBasicAuthHeader(
      this.args.auth.username,
      this.args.auth.password,
    );
    return {
      Authorization: authHeaderValue,
    };
  }

  async getAccountBalance(
    username: string,
  ): Promise<BankAccountBalanceResponse> {
    const url = new URL(`accounts/${username}`, this.baseUrl);
    const resp = await this.httpLib.fetch(url.href, {
      headers: this.makeAuthHeader(),
    });
    return readSuccessResponseJsonOrThrow(resp, codecForAny());
  }

  async getTransactions(username: string): Promise<void> {
    const reqUrl = new URL(`accounts/${username}/transactions`, this.baseUrl);
    const resp = await this.httpLib.fetch(reqUrl.href, {
      method: "GET",
      headers: {
        ...this.makeAuthHeader(),
      },
    });

    const res = await readSuccessResponseJsonOrThrow(resp, codecForAny());
    logger.info(`result: ${j2s(res)}`);
  }

  async createTransaction(
    username: string,
    req: BankAccessApiCreateTransactionRequest,
  ): Promise<any> {
    const reqUrl = new URL(`accounts/${username}/transactions`, this.baseUrl);

    const resp = await this.httpLib.fetch(reqUrl.href, {
      method: "POST",
      body: req,
      headers: this.makeAuthHeader(),
    });

    return await readSuccessResponseJsonOrThrow(resp, codecForAny());
  }

  async registerAccountExtended(req: RegisterAccountRequest): Promise<void> {
    const url = new URL("accounts", this.baseUrl);
    const resp = await this.httpLib.fetch(url.href, {
      method: "POST",
      body: req,
      headers: this.makeAuthHeader(),
    });

    if (
      resp.status !== 200 &&
      resp.status !== 201 &&
      resp.status !== 202 &&
      resp.status !== 204
    ) {
      logger.error(`unexpected status ${resp.status} from POST ${url.href}`);
      logger.error(`${j2s(await resp.json())}`);
      throw TalerError.fromDetail(
        TalerErrorCode.GENERIC_UNEXPECTED_REQUEST_ERROR,
        {
          httpStatusCode: resp.status,
        },
      );
    }
  }

  /**
   * Register a new account and return information about it.
   *
   * This is a helper, as it does both the registration and the
   * account info query.
   */
  async registerAccount(username: string, password: string): Promise<BankUser> {
    const url = new URL("accounts", this.baseUrl);
    const resp = await this.httpLib.fetch(url.href, {
      method: "POST",
      body: {
        username,
        password,
        name: username,
      },
      headers: this.makeAuthHeader(),
    });
    if (
      resp.status !== 200 &&
      resp.status !== 201 &&
      resp.status !== 202 &&
      resp.status !== 204
    ) {
      logger.error(`unexpected status ${resp.status} from POST ${url.href}`);
      logger.error(`${j2s(await resp.json())}`);
      throw TalerError.fromDetail(
        TalerErrorCode.GENERIC_UNEXPECTED_REQUEST_ERROR,
        {
          httpStatusCode: resp.status,
        },
      );
    }
    // FIXME: Corebank should directly return this info!
    const infoUrl = new URL(`accounts/${username}`, this.baseUrl);
    const infoResp = await this.httpLib.fetch(infoUrl.href, {
      headers: {
        Authorization: makeBasicAuthHeader(username, password),
      },
    });
    // FIXME: Validate!
    const acctInfo: AccountData = await readSuccessResponseJsonOrThrow(
      infoResp,
      codecForAny(),
    );
    return {
      password,
      username,
      accountPaytoUri: acctInfo.payto_uri,
    };
  }

  async createRandomBankUser(): Promise<BankUser> {
    const username = "user-" + encodeCrock(getRandomBytes(10)).toLowerCase();
    const password = "pw-" + encodeCrock(getRandomBytes(10)).toLowerCase();
    return await this.registerAccount(username, password);
  }

  async createWithdrawalOperation(
    user: string,
    amount: string | undefined,
  ): Promise<WithdrawalOperationInfo> {
    const url = new URL(`accounts/${user}/withdrawals`, this.baseUrl);
    const resp = await this.httpLib.fetch(url.href, {
      method: "POST",
      body: {
        amount,
      },
      headers: this.makeAuthHeader(),
    });
    return readSuccessResponseJsonOrThrow(
      resp,
      codecForWithdrawalOperationInfo(),
    );
  }

  async confirmWithdrawalOperation(
    username: string,
    wopi: ConfirmWithdrawalArgs,
  ) {
    const url = new URL(
      `accounts/${username}/withdrawals/${wopi.withdrawalOperationId}/confirm`,
      this.baseUrl,
    );
    logger.info(`confirming withdrawal operation via ${url.href}`);
    const resp = await this.httpLib.fetch(url.href, {
      method: "POST",
      body: {},
      headers: this.makeAuthHeader(),
    });

    switch (resp.status) {
      case HttpStatusCode.Ok:
      case HttpStatusCode.NoContent:
        return opEmptySuccess(resp);
      case HttpStatusCode.NotFound:
        return opKnownHttpFailure(resp.status, resp);
      default:
        return opUnknownFailure(resp, await readTalerErrorResponse(resp));
    }
  }

  async abortWithdrawalOperation(wopi: WithdrawalOperationInfo): Promise<void> {
    const url = new URL(
      `withdrawals/${wopi.withdrawal_id}/abort`,
      this.baseUrl,
    );
    const resp = await this.httpLib.fetch(url.href, {
      method: "POST",
      body: {},
      headers: this.makeAuthHeader(),
    });
    await readSuccessResponseJsonOrThrow(resp, codecForAny());
  }

  async abortWithdrawalOperationV2(
    username: string,
    wopi: WithdrawalOperationInfo,
  ): Promise<void> {
    const url = new URL(
      `accounts/${username}/withdrawals/${wopi.withdrawal_id}/abort`,
      this.baseUrl,
    );
    const resp = await this.httpLib.fetch(url.href, {
      method: "POST",
      body: {},
      headers: this.makeAuthHeader(),
    });
    await expectSuccessResponseOrThrow(resp);
  }
}