exchange/src/lib/test_exchange_api.c

/*
  This file is part of TALER
  Copyright (C) 2014--2020 Taler Systems SA

  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.

  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 TALER; see the file COPYING.  If not, see
  <http://www.gnu.org/licenses/>
*/
/**
 * @file lib/test_exchange_api.c
 * @brief testcase to test exchange's HTTP API interface
 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
 * @author Christian Grothoff
 * @author Marcello Stanisci
 */
#include "platform.h"
#include "taler_util.h"
#include "taler_signatures.h"
#include "taler_exchange_service.h"
#include "taler_json_lib.h"
#include <gnunet/gnunet_util_lib.h>
#include <microhttpd.h>
#include "taler_bank_service.h"
#include "taler_fakebank_lib.h"
#include "taler_testing_lib.h"

/**
 * Configuration file we use.  One (big) configuration is used
 * for the various components for this test.
 */
#define CONFIG_FILE "test_exchange_api.conf"

#define CONFIG_FILE_EXPIRE_RESERVE_NOW \
  "test_exchange_api_expire_reserve_now.conf"


/**
 * Exchange configuration data.
 */
static struct TALER_TESTING_ExchangeConfiguration ec;

/**
 * Bank configuration data.
 */
static struct TALER_TESTING_BankConfiguration bc;


/**
 * Execute the taler-exchange-wirewatch command with
 * our configuration file.
 *
 * @param label label to use for the command.
 */
#define CMD_EXEC_WIREWATCH(label) \
  TALER_TESTING_cmd_exec_wirewatch (label, CONFIG_FILE)

/**
 * Execute the taler-exchange-aggregator command with
 * our configuration file.
 *
 * @param label label to use for the command.
 */
#define CMD_EXEC_AGGREGATOR(label) \
  TALER_TESTING_cmd_exec_aggregator (label, CONFIG_FILE)

/**
 * Run wire transfer of funds from some user's account to the
 * exchange.
 *
 * @param label label to use for the command.
 * @param amount amount to transfer, i.e. "EUR:1"
 */
#define CMD_TRANSFER_TO_EXCHANGE(label,amount) \
  TALER_TESTING_cmd_admin_add_incoming (label, amount, \
                                        bc.exchange_account_url,           \
                                        &bc.exchange_auth,                \
                                        bc.user42_payto)

/**
 * Main function that will tell the interpreter what commands to
 * run.
 *
 * @param cls closure
 */
static void
run (void *cls,
     struct TALER_TESTING_Interpreter *is)
{
  /**
   * Checks made against /wire response.
   */
  struct TALER_TESTING_Command wire[] = {
    /**
     * Check if 'x-taler-bank' wire method is offered
     * by the exchange.
     */
    TALER_TESTING_cmd_wire ("wire-taler-bank-1",
                            "x-taler-bank",
                            NULL,
                            MHD_HTTP_OK),
    TALER_TESTING_cmd_end ()
  };

  /**
   * Test withdrawal plus spending.
   */
  struct TALER_TESTING_Command withdraw[] = {

    /**
     * Move money to the exchange's bank account.
     */
    CMD_TRANSFER_TO_EXCHANGE ("create-reserve-1",
                              "EUR:5.01"),
    /**
     * Make a reserve exist, according to the previous
     * transfer.
     */
    CMD_EXEC_WIREWATCH ("wirewatch-1"),
    /**
     * Withdraw EUR:5.
     */
    TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-1",
                                       "create-reserve-1",
                                       "EUR:5",
                                       MHD_HTTP_OK),
    /**
     * Check the reserve is depleted.
     */
    TALER_TESTING_cmd_status ("status-1",
                              "create-reserve-1",
                              "EUR:0",
                              MHD_HTTP_OK),

    TALER_TESTING_cmd_end ()
  };

  struct TALER_TESTING_Command spend[] = {
    /**
     * Spend the coin.
     */
    TALER_TESTING_cmd_deposit
      ("deposit-simple", "withdraw-coin-1", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"ice cream\",\"value\":1}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:5", MHD_HTTP_OK),

    /**
     * Try to overdraw.
     */
    TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-2",
                                       "create-reserve-1",
                                       "EUR:5",
                                       MHD_HTTP_CONFLICT),

    /**
     * Try to double spend using different wire details.
     */
    TALER_TESTING_cmd_deposit
      ("deposit-double-1", "withdraw-coin-1", 0,
      bc.user43_payto,
      "{\"items\":[{\"name\":\"ice cream\",\"value\":1}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:5", MHD_HTTP_CONFLICT),

    /**
     * Try to double spend using a different transaction id.
     * (copied verbatim from old exchange-lib tests.)
     * FIXME: how can it get a different transaction id?  There
     * isn't such a thing actually, the exchange only knows about
     * contract terms' hashes.  So since the contract terms are
     * exactly the same as the previous command,
     * how can a different id be generated?
     */TALER_TESTING_cmd_deposit
      ("deposit-double-1", "withdraw-coin-1", 0,
      bc.user43_payto,
      "{\"items\":[{\"name\":\"ice cream\",\"value\":1}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:5", MHD_HTTP_CONFLICT),

    /**
     * Try to double spend with different proposal.
     */
    TALER_TESTING_cmd_deposit
      ("deposit-double-2", "withdraw-coin-1", 0,
      bc.user43_payto,
      "{\"items\":[{\"name\":\"ice cream\",\"value\":2}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:5", MHD_HTTP_CONFLICT),

    TALER_TESTING_cmd_end ()
  };


  struct TALER_TESTING_Command refresh[] = {

    /**
     * Fill reserve with EUR:5, 1ct is for fees.  NOTE: the old
     * test-suite gave a account number of _424_ to the user at
     * this step; to type less, here the _42_ number is reused.
     * Does this change the tests semantics?
     */CMD_TRANSFER_TO_EXCHANGE ("refresh-create-reserve-1",
                              "EUR:5.01"),

    /**
     * Make previous command effective.
     */
    CMD_EXEC_WIREWATCH ("wirewatch-2"),

    /**
     * Withdraw EUR:5.
     */
    TALER_TESTING_cmd_withdraw_amount
      ("refresh-withdraw-coin-1",
      "refresh-create-reserve-1",
      "EUR:5",
      MHD_HTTP_OK),
    /**
     * Try to partially spend (deposit) 1 EUR of the 5 EUR coin
     * (in full) (merchant would receive EUR:0.99 due to 1 ct
     * deposit fee)
     */TALER_TESTING_cmd_deposit
      ("refresh-deposit-partial",
      "refresh-withdraw-coin-1", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"ice cream\",\
                     \"value\":\"EUR:1\"}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:1", MHD_HTTP_OK),

    /**
     * Melt the rest of the coin's value
     * (EUR:4.00 = 3x EUR:1.03 + 7x EUR:0.13) */
    TALER_TESTING_cmd_refresh_melt_double
      ("refresh-melt-1",
      "refresh-withdraw-coin-1",
      MHD_HTTP_OK,
      NULL),
    /**
     * Complete (successful) melt operation, and
     * withdraw the coins
     */
    TALER_TESTING_cmd_refresh_reveal
      ("refresh-reveal-1",
      "refresh-melt-1", MHD_HTTP_OK),

    /**
     * Do it again to check idempotency
     */
    TALER_TESTING_cmd_refresh_reveal
      ("refresh-reveal-1-idempotency",
      "refresh-melt-1", MHD_HTTP_OK),

    /**
     * Test that /refresh/link works
     */
    TALER_TESTING_cmd_refresh_link
      ("refresh-link-1",
      "refresh-reveal-1", MHD_HTTP_OK),

    /**
     * Try to spend a refreshed EUR:1 coin
     */
    TALER_TESTING_cmd_deposit
      ("refresh-deposit-refreshed-1a",
      "refresh-reveal-1-idempotency", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"ice cream\",\
                     \"value\":3}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:1", MHD_HTTP_OK),

    /**
     * Try to spend a refreshed EUR:0.1 coin
     */
    TALER_TESTING_cmd_deposit
      ("refresh-deposit-refreshed-1b",
      "refresh-reveal-1", 3,
      bc.user43_payto,
      "{\"items\":[{\"name\":\"ice cream\",\
                     \"value\":3}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:0.1", MHD_HTTP_OK),

    /* Test running a failing melt operation (same operation
     * again must fail) */
    TALER_TESTING_cmd_refresh_melt
      ("refresh-melt-failing",
      "refresh-withdraw-coin-1",
      MHD_HTTP_CONFLICT,
      NULL),

    /* FIXME: also test with coin that was already melted
     * (signature differs from coin that was deposited...) */

    TALER_TESTING_cmd_end ()
  };

  struct TALER_TESTING_Command track[] = {
    /**
     * Try resolving a deposit's WTID, as we never triggered
     * execution of transactions, the answer should be that
     * the exchange knows about the deposit, but has no WTID yet.
     */TALER_TESTING_cmd_track_transaction
      ("deposit-wtid-found",
      "deposit-simple", 0, MHD_HTTP_ACCEPTED, NULL),

    /**
     * Try resolving a deposit's WTID for a failed deposit.
     * As the deposit failed, the answer should be that the
     * exchange does NOT know about the deposit.
     */TALER_TESTING_cmd_track_transaction
      ("deposit-wtid-failing",
      "deposit-double-2", 0, MHD_HTTP_NOT_FOUND, NULL),

    /**
     * Try resolving an undefined (all zeros) WTID; this
     * should fail as obviously the exchange didn't use that
     * WTID value for any transaction.
     */TALER_TESTING_cmd_track_transfer_empty
      ("wire-deposit-failing",
      NULL, 0, MHD_HTTP_NOT_FOUND),

    /**
     * Run transfers. Note that _actual_ aggregation will NOT
     * happen here, as each deposit operation is run with a
     * fresh merchant public key! NOTE: this comment comes
     * "verbatim" from the old test-suite, and IMO does not explain
     * a lot!
     */CMD_EXEC_AGGREGATOR ("run-aggregator"),

    /**
     * Check all the transfers took place.
     */
    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-499c", ec.exchange_url,
      "EUR:4.98", bc.exchange_payto, bc.user42_payto),

    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-99c1", ec.exchange_url,
      "EUR:0.98", bc.exchange_payto, bc.user42_payto),

    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-99c2", ec.exchange_url,
      "EUR:0.98", bc.exchange_payto, bc.user42_payto),

    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-99c", ec.exchange_url,
      "EUR:0.08", bc.exchange_payto, bc.user43_payto),

    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-aai-1", ec.exchange_url,
      "EUR:5.01", bc.user42_payto, bc.exchange_payto),

    /**
     * NOTE: the old test-suite had this "check bank transfer"
     * command with debit account == 424.
     */
    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-aai-2", ec.exchange_url,
      "EUR:5.01", bc.user42_payto, bc.exchange_payto),

    TALER_TESTING_cmd_check_bank_empty ("check_bank_empty"),

    TALER_TESTING_cmd_track_transaction
      ("deposit-wtid-ok",
      "deposit-simple", 0, MHD_HTTP_OK, "check_bank_transfer-499c"),

    TALER_TESTING_cmd_track_transfer
      ("wire-deposit-success-bank",
      "check_bank_transfer-99c1", 0, MHD_HTTP_OK, "EUR:0.98",
      "EUR:0.01"),

    TALER_TESTING_cmd_track_transfer
      ("wire-deposits-success-wtid",
      "deposit-wtid-ok", 0, MHD_HTTP_OK, "EUR:4.98",
      "EUR:0.01"),

    TALER_TESTING_cmd_end ()
  };


  /**
   * This block checks whether a wire deadline
   * very far in the future does NOT get aggregated now.
   */
  struct TALER_TESTING_Command unaggregation[] = {

    TALER_TESTING_cmd_check_bank_empty
      ("far-future-aggregation-a"),

    CMD_TRANSFER_TO_EXCHANGE ("create-reserve-unaggregated",
                              "EUR:5.01"),

    CMD_EXEC_WIREWATCH ("wirewatch-unaggregated"),

    /* "consume" reserve creation transfer.  */
    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-unaggregated",
      ec.exchange_url,
      "EUR:5.01",
      bc.user42_payto, bc.exchange_payto),

    TALER_TESTING_cmd_withdraw_amount
      ("withdraw-coin-unaggregated",
      "create-reserve-unaggregated",
      "EUR:5",
      MHD_HTTP_OK),

    TALER_TESTING_cmd_deposit
      ("deposit-unaggregated",
      "withdraw-coin-unaggregated",
      0,
      bc.user43_payto,
      "{\"items\":[{\"name\":\"ice cream\",\"value\":1}]}",
      GNUNET_TIME_relative_multiply
        (GNUNET_TIME_UNIT_YEARS,
        3000),
      "EUR:5",
      MHD_HTTP_OK),

    CMD_EXEC_AGGREGATOR ("aggregation-attempt"),

    TALER_TESTING_cmd_check_bank_empty
      ("far-future-aggregation-b"),

    TALER_TESTING_cmd_end ()
  };


  struct TALER_TESTING_Command refund[] = {

    /**
     * Fill reserve with EUR:5.01, as withdraw fee is 1 ct per
     * config.
     */
    CMD_TRANSFER_TO_EXCHANGE ("create-reserve-r1",
                              "EUR:5.01"),


    /**
     * Run wire-watch to trigger the reserve creation.
     */
    CMD_EXEC_WIREWATCH ("wirewatch-3"),

    /* Withdraw a 5 EUR coin, at fee of 1 ct */
    TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-r1",
                                       "create-reserve-r1",
                                       "EUR:5",
                                       MHD_HTTP_OK),
    /**
     * Spend 5 EUR of the 5 EUR coin (in full) (merchant would
     * receive EUR:4.99 due to 1 ct deposit fee)
     */
    TALER_TESTING_cmd_deposit
      ("deposit-refund-1", "withdraw-coin-r1", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"ice cream\","
      "\"value\":\"EUR:5\"}]}",
      GNUNET_TIME_UNIT_MINUTES, "EUR:5", MHD_HTTP_OK),


    /**
     * Run transfers. Should do nothing as refund deadline blocks
     * it
     */
    CMD_EXEC_AGGREGATOR ("run-aggregator-refund"),

    /**
     * Check that aggregator didn't do anything, as expected.
     * Note, this operation takes two commands: one to "flush"
     * the preliminary transfer (used to withdraw) from the
     * fakebank and the second to actually check there are not
     * other transfers around.
     */TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-pre-refund", ec.exchange_url,
      "EUR:5.01", bc.user42_payto, bc.exchange_payto),

    TALER_TESTING_cmd_check_bank_empty
      ("check_bank_transfer-pre-refund"),

    TALER_TESTING_cmd_refund
      ("refund-ok", MHD_HTTP_OK,
      "EUR:5", "EUR:0.01", "deposit-refund-1"),

    TALER_TESTING_cmd_refund
      ("refund-ok-double", MHD_HTTP_OK,
      "EUR:5", "EUR:0.01", "deposit-refund-1"),

    /* Previous /refund(s) had id == 0.  */
    TALER_TESTING_cmd_refund_with_id
      ("refund-conflicting", MHD_HTTP_CONFLICT,
      "EUR:5", "EUR:0.01", "deposit-refund-1", 1),

    /**
     * Spend 4.99 EUR of the refunded 4.99 EUR coin (1ct gone
     * due to refund) (merchant would receive EUR:4.98 due to
     * 1 ct deposit fee) */
    TALER_TESTING_cmd_deposit
      ("deposit-refund-2", "withdraw-coin-r1", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"more ice cream\","
      "\"value\":\"EUR:5\"}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:4.99", MHD_HTTP_OK),


    /**
     * Run transfers. This will do the transfer as refund deadline
     * was 0
     */
    CMD_EXEC_AGGREGATOR ("run-aggregator-3"),

    /**
     * Check that deposit did run.
     */
    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-pre-refund", ec.exchange_url,
      "EUR:4.97", bc.exchange_payto, bc.user42_payto),

    /**
     * Run failing refund, as past deadline & aggregation.
     */
    TALER_TESTING_cmd_refund
      ("refund-fail", MHD_HTTP_GONE,
      "EUR:4.99", "EUR:0.01", "deposit-refund-2"),

    TALER_TESTING_cmd_check_bank_empty
      ("check-empty-after-refund"),

    /**
     * Test refunded coins are never executed, even past
     * refund deadline
     */
    CMD_TRANSFER_TO_EXCHANGE ("create-reserve-rb",
                              "EUR:5.01"),

    CMD_EXEC_WIREWATCH ("wirewatch-rb"),

    TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-rb",
                                       "create-reserve-rb",
                                       "EUR:5",
                                       MHD_HTTP_OK),

    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-aai-3b", ec.exchange_url,
      "EUR:5.01", bc.user42_payto, bc.exchange_payto),


    TALER_TESTING_cmd_deposit
      ("deposit-refund-1b", "withdraw-coin-rb", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"ice cream\","
      "\"value\":\"EUR:5\"}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:5", MHD_HTTP_OK),

    /**
     * Trigger refund (before aggregator had a chance to execute
     * deposit, even though refund deadline was zero).
     */
    TALER_TESTING_cmd_refund
      ("refund-ok-fast", MHD_HTTP_OK,
      "EUR:5", "EUR:0.01", "deposit-refund-1b"),

    /**
     * Run transfers. This will do the transfer as refund deadline
     * was 0, except of course because the refund succeeded, the
     * transfer should no longer be done.
     */CMD_EXEC_AGGREGATOR ("run-aggregator-3b"),

    /* check that aggregator didn't do anything, as expected */
    TALER_TESTING_cmd_check_bank_empty
      ("check-refund-fast-not-run"),

    TALER_TESTING_cmd_end ()
  };

  struct TALER_TESTING_Command payback[] = {
    /**
     * Fill reserve with EUR:5.01, as withdraw fee is 1 ct per
     * config.
     */
    CMD_TRANSFER_TO_EXCHANGE ("payback-create-reserve-1",
                              "EUR:5.01"),

    /**
     * Run wire-watch to trigger the reserve creation.
     */
    CMD_EXEC_WIREWATCH ("wirewatch-4"),

    /* Withdraw a 5 EUR coin, at fee of 1 ct */
    TALER_TESTING_cmd_withdraw_amount ("payback-withdraw-coin-1",
                                       "payback-create-reserve-1",
                                       "EUR:5",
                                       MHD_HTTP_OK),
    /* Make coin invalid */
    TALER_TESTING_cmd_revoke ("revoke-1",
                              MHD_HTTP_OK,
                              "payback-withdraw-coin-1",
                              CONFIG_FILE),

    /* Refund coin to bank account */
    TALER_TESTING_cmd_payback ("payback-1",
                               MHD_HTTP_OK,
                               "payback-withdraw-coin-1",
                               "EUR:5",
                               NULL),

    /* Check the money is back with the reserve */
    TALER_TESTING_cmd_status ("payback-reserve-status-1",
                              "payback-create-reserve-1",
                              "EUR:5.0",
                              MHD_HTTP_OK),

    /* Re-withdraw from this reserve */
    TALER_TESTING_cmd_withdraw_amount ("payback-withdraw-coin-2",
                                       "payback-create-reserve-1",
                                       "EUR:1",
                                       MHD_HTTP_OK),

    /**
     * This withdrawal will test the logic to create a "payback"
     * element to insert into the reserve's history.
     */
    TALER_TESTING_cmd_withdraw_amount
      ("payback-withdraw-coin-2-over",
      "payback-create-reserve-1",
      "EUR:10",
      MHD_HTTP_CONFLICT),

    TALER_TESTING_cmd_status ("payback-reserve-status-2",
                              "payback-create-reserve-1",
                              "EUR:3.99",
                              MHD_HTTP_OK),

    /**
     * These commands should close the reserve because
     * the aggregator is given a config file that ovverrides
     * the reserve expiration time (making it now-ish)
     */CMD_TRANSFER_TO_EXCHANGE
      ("short-lived-reserve",
      "EUR:5.01"),

    TALER_TESTING_cmd_exec_wirewatch
      ("short-lived-aggregation",
      CONFIG_FILE_EXPIRE_RESERVE_NOW),

    TALER_TESTING_cmd_exec_aggregator
      ("close-reserves",
      CONFIG_FILE_EXPIRE_RESERVE_NOW),

    TALER_TESTING_cmd_status ("short-lived-status",
                              "short-lived-reserve",
                              "EUR:0",
                              MHD_HTTP_OK),

    TALER_TESTING_cmd_withdraw_amount
      ("expired-withdraw",
      "short-lived-reserve",
      "EUR:1",
      MHD_HTTP_CONFLICT),

    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_short-lived_transfer",
      ec.exchange_url,
      "EUR:5.01",
      bc.user42_payto,
      bc.exchange_payto),

    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_short-lived_reimburse",
      ec.exchange_url,
      "EUR:5",
      bc.exchange_payto,
      bc.user42_payto),

    /**
     * Fill reserve with EUR:2.02, as withdraw fee is 1 ct per
     * config, then withdraw two coin, partially spend one, and
     * then have the rest paid back.  Check deposit of other coin
     * fails.  (Do not use EUR:5 here as the EUR:5 coin was
     * revoked and we did not bother to create a new one...)
     */CMD_TRANSFER_TO_EXCHANGE ("payback-create-reserve-2",
                              "EUR:2.02"),

    /* Make previous command effective. */
    CMD_EXEC_WIREWATCH ("wirewatch-5"),

    /* Withdraw a 1 EUR coin, at fee of 1 ct */
    TALER_TESTING_cmd_withdraw_amount ("payback-withdraw-coin-2a",
                                       "payback-create-reserve-2",
                                       "EUR:1",
                                       MHD_HTTP_OK),

    /* Withdraw a 1 EUR coin, at fee of 1 ct */
    TALER_TESTING_cmd_withdraw_amount ("payback-withdraw-coin-2b",
                                       "payback-create-reserve-2",
                                       "EUR:1",
                                       MHD_HTTP_OK),

    TALER_TESTING_cmd_deposit
      ("payback-deposit-partial",
      "payback-withdraw-coin-2a", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"more ice cream\",\"value\":1}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:0.5", MHD_HTTP_OK),


    TALER_TESTING_cmd_revoke ("revoke-2", MHD_HTTP_OK,
                              "payback-withdraw-coin-2a",
                              CONFIG_FILE),

    TALER_TESTING_cmd_payback ("payback-2", MHD_HTTP_OK,
                               "payback-withdraw-coin-2a",
                               "EUR:0.5",
                               NULL),

    TALER_TESTING_cmd_payback ("payback-2b", MHD_HTTP_CONFLICT,
                               "payback-withdraw-coin-2a",
                               "EUR:0.5",
                               NULL),

    TALER_TESTING_cmd_deposit
      ("payback-deposit-revoked",
      "payback-withdraw-coin-2b", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"more ice cream\",\"value\":1}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:1", MHD_HTTP_NOT_FOUND),


    /* Test deposit fails after payback, with proof in payback */

    /* FIXME: #3887: right now, the exchange will never return the
     * coin's transaction history with payback data, as we get a
     * 404 on the DK! */
    TALER_TESTING_cmd_deposit
      ("payback-deposit-partial-after-payback",
      "payback-withdraw-coin-2a",
      0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"extra ice cream\",\"value\":1}]}",
      GNUNET_TIME_UNIT_ZERO,
      "EUR:0.5",
      MHD_HTTP_NOT_FOUND),

    /* Test that revoked coins cannot be withdrawn */
    CMD_TRANSFER_TO_EXCHANGE ("payback-create-reserve-3",
                              "EUR:1.01"),

    CMD_EXEC_WIREWATCH ("wirewatch-6"),

    TALER_TESTING_cmd_withdraw_amount
      ("payback-withdraw-coin-3-revoked",
      "payback-create-reserve-3",
      "EUR:1",
      MHD_HTTP_NOT_FOUND),

    /* check that we are empty before the rejection test */
    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-pr1", ec.exchange_url,
      "EUR:5.01", bc.user42_payto, bc.exchange_payto),
    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-pr2", ec.exchange_url,
      "EUR:2.02", bc.user42_payto, bc.exchange_payto),
    TALER_TESTING_cmd_check_bank_transfer
      ("check_bank_transfer-pr3", ec.exchange_url,
      "EUR:1.01", bc.user42_payto, bc.exchange_payto),
    TALER_TESTING_cmd_check_bank_empty
      ("check-empty-again"),

    TALER_TESTING_cmd_end ()
  };

  struct TALER_TESTING_Command revocation[] = {
    /**
     * Fill reserve with EUR:5.01, as withdraw fee is 1 ct per
     * config.
     */
    CMD_TRANSFER_TO_EXCHANGE ("create-reserve-1",
                              "EUR:5.01"),
    /**
     * Run wire-watch to trigger the reserve creation.
     */
    CMD_EXEC_WIREWATCH ("wirewatch-4"),
    /* Withdraw a 5 EUR coin, at fee of 1 ct */
    TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-1",
                                       "create-reserve-1",
                                       "EUR:5",
                                       MHD_HTTP_OK),
    /**
     * Try to partially spend (deposit) 1 EUR of the 5 EUR coin
     * (in full) (merchant would receive EUR:0.99 due to 1 ct
     * deposit fee)
     */TALER_TESTING_cmd_deposit
      ("deposit-partial",
      "withdraw-coin-1", 0,
      bc.user42_payto,
      "{\"items\":[{\"name\":\"ice cream\",\
                     \"value\":\"EUR:1\"}]}",
      GNUNET_TIME_UNIT_ZERO, "EUR:1", MHD_HTTP_OK),
    /**
     * Melt SOME of the rest of the coin's value
     * (EUR:3.17 = 3x EUR:1.03 + 7x EUR:0.13) */
    TALER_TESTING_cmd_refresh_melt
      ("refresh-melt-1",
      "withdraw-coin-1",
      MHD_HTTP_OK,
      NULL),
    /**
     * Complete (successful) melt operation, and withdraw the coins
     */
    TALER_TESTING_cmd_refresh_reveal
      ("refresh-reveal-1",
      "refresh-melt-1", MHD_HTTP_OK),
    /* Make refreshed coin invalid */
    TALER_TESTING_cmd_revoke ("revoke-1",
                              MHD_HTTP_OK,
                              "refresh-melt-1",
                              CONFIG_FILE),
    /* Refund coin to original coin */
    TALER_TESTING_cmd_payback ("payback-1a",
                               MHD_HTTP_OK,
                               "refresh-reveal-1#0",
                               "EUR:1",
                               "refresh-melt-1"),
    TALER_TESTING_cmd_payback ("payback-1b",
                               MHD_HTTP_OK,
                               "refresh-reveal-1#1",
                               "EUR:1",
                               "refresh-melt-1"),
    TALER_TESTING_cmd_payback ("payback-1c",
                               MHD_HTTP_OK,
                               "refresh-reveal-1#2",
                               "EUR:1",
                               "refresh-melt-1"),
    /* Now we have EUR:3.83 EUR back after 3x EUR:1 in paybacks */
    /* Melt original coin AGAIN, but only create one 0.1 EUR coin;
       This costs EUR:0.03 in refresh and EUR:01 in withdraw fees,
       leaving EUR:3.69. */
    TALER_TESTING_cmd_refresh_melt
      ("refresh-melt-2",
      "withdraw-coin-1",
      MHD_HTTP_OK,
      "EUR:0.1",
      NULL),
    /**
     * Complete (successful) melt operation, and withdraw the coins
     */
    TALER_TESTING_cmd_refresh_reveal
      ("refresh-reveal-2",
      "refresh-melt-2", MHD_HTTP_OK),
    /* Revokes refreshed EUR:0.1 coin  */
    TALER_TESTING_cmd_revoke ("revoke-2",
                              MHD_HTTP_OK,
                              "refresh-reveal-2",
                              CONFIG_FILE),
    /* Revoke also original coin denomination */
    TALER_TESTING_cmd_revoke ("revoke-3",
                              MHD_HTTP_OK,
                              "withdraw-coin-1",
                              CONFIG_FILE),
    /* Refund coin EUR:0.1 to original coin, creating zombie! */
    TALER_TESTING_cmd_payback ("payback-2",
                               MHD_HTTP_OK,
                               "refresh-reveal-2",
                               "EUR:0.1",
                               "refresh-melt-2"),
    /* Due to payback, original coin is now at EUR:3.79 */
    /* Refund original (now zombie) coin to reserve */
    TALER_TESTING_cmd_payback ("payback-3",
                               MHD_HTTP_OK,
                               "withdraw-coin-1",
                               "EUR:3.79",
                               NULL),
    /* Check the money is back with the reserve */
    TALER_TESTING_cmd_status ("payback-reserve-status-1",
                              "create-reserve-1",
                              "EUR:3.79",
                              MHD_HTTP_OK),
    TALER_TESTING_cmd_end ()
  };

#define RESERVE_OPEN_CLOSE_CHUNK 4
#define RESERVE_OPEN_CLOSE_ITERATIONS 3

  struct TALER_TESTING_Command reserve_open_close[(RESERVE_OPEN_CLOSE_ITERATIONS
                                                   * RESERVE_OPEN_CLOSE_CHUNK)
                                                  + 1];
  for (unsigned int i = 0;
       i < RESERVE_OPEN_CLOSE_ITERATIONS;
       i++)
  {
    reserve_open_close[(i * RESERVE_OPEN_CLOSE_CHUNK) + 0]
      = CMD_TRANSFER_TO_EXCHANGE
          ("reserve-open-close-key",
          "EUR:20");
    reserve_open_close[(i * RESERVE_OPEN_CLOSE_CHUNK) + 1]
      = TALER_TESTING_cmd_exec_wirewatch
          ("reserve-open-close-wirewatch",
          CONFIG_FILE_EXPIRE_RESERVE_NOW);
    reserve_open_close[(i * RESERVE_OPEN_CLOSE_CHUNK) + 2]
      = TALER_TESTING_cmd_exec_aggregator
          ("reserve-open-close-aggregation",
          CONFIG_FILE_EXPIRE_RESERVE_NOW);
    reserve_open_close[(i * RESERVE_OPEN_CLOSE_CHUNK) + 3]
      = TALER_TESTING_cmd_status ("reserve-open-close-status",
                                  "reserve-open-close-key",
                                  "EUR:0",
                                  MHD_HTTP_OK);
  }
  reserve_open_close[RESERVE_OPEN_CLOSE_ITERATIONS * RESERVE_OPEN_CLOSE_CHUNK]
    = TALER_TESTING_cmd_end ();


  struct TALER_TESTING_Command commands[] = {
    TALER_TESTING_cmd_batch ("wire",
                             wire),
    TALER_TESTING_cmd_batch ("withdraw",
                             withdraw),
    TALER_TESTING_cmd_batch ("spend",
                             spend),
    TALER_TESTING_cmd_batch ("refresh",
                             refresh),
    TALER_TESTING_cmd_batch ("track",
                             track),
    TALER_TESTING_cmd_batch ("unaggregation",
                             unaggregation),
    TALER_TESTING_cmd_batch ("refund",
                             refund),
    TALER_TESTING_cmd_batch ("payback",
                             payback),
    TALER_TESTING_cmd_batch ("reserve-open-close",
                             reserve_open_close),
    TALER_TESTING_cmd_batch ("revocation",
                             revocation),
    /**
     * End the suite.  Fixme: better to have a label for this
     * too, as it shows as "(null)" on logs.
     */
    TALER_TESTING_cmd_end ()
  };

  TALER_TESTING_run_with_fakebank (is,
                                   commands,
                                   bc.bank_url);
}


int
main (int argc,
      char *const *argv)
{
  /* These environment variables get in the way... */
  unsetenv ("XDG_DATA_HOME");
  unsetenv ("XDG_CONFIG_HOME");
  GNUNET_log_setup ("test-exchange-api",
                    "INFO",
                    NULL);
  /* Check fakebank port is available and get config */
  if (GNUNET_OK !=
      TALER_TESTING_prepare_fakebank (CONFIG_FILE,
                                      "account-2",
                                      &bc))
    return 77;
  TALER_TESTING_cleanup_files (CONFIG_FILE);
  /* @helpers.  Run keyup, create tables, ... Note: it
   * fetches the port number from config in order to see
   * if it's available. */
  switch (TALER_TESTING_prepare_exchange (CONFIG_FILE,
                                          &ec))
  {
  case GNUNET_SYSERR:
    GNUNET_break (0);
    return 1;
  case GNUNET_NO:
    return 77;
  case GNUNET_OK:
    if (GNUNET_OK !=
        /* Set up event loop and reschedule context, plus
         * start/stop the exchange.  It calls TALER_TESTING_setup
         * which creates the 'is' object.
         */
        TALER_TESTING_setup_with_exchange (&run,
                                           NULL,
                                           CONFIG_FILE))
      return 1;
    break;
  default:
    GNUNET_break (0);
    return 1;
  }
  return 0;
}


/* end of test_exchange_api.c */