payback -> recoup stranglers

1 files changed, 0 insertions, 423 deletions

diff --git a/src/lib/exchange_api_payback.c b/src/lib/exchange_api_payback.c
deleted file mode 100644
index c20208055..000000000
--- a/src/lib/exchange_api_payback.c
+++ /dev/null
@@ -1,423 +0,0 @@
-/*
-  This file is part of TALER
-  Copyright (C) 2017 GNUnet e.V. and Inria
-
-  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/exchange_api_payback.c
- * @brief Implementation of the /payback request of the exchange's HTTP API
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include <jansson.h>
-#include <microhttpd.h> /* just for HTTP status codes */
-#include <gnunet/gnunet_util_lib.h>
-#include <gnunet/gnunet_json_lib.h>
-#include <gnunet/gnunet_curl_lib.h>
-#include "taler_json_lib.h"
-#include "taler_exchange_service.h"
-#include "exchange_api_handle.h"
-#include "taler_signatures.h"
-#include "exchange_api_curl_defaults.h"
-
-
-/**
- * @brief A Payback Handle
- */
-struct TALER_EXCHANGE_PaybackHandle
-{
-
-  /**
-   * The connection to exchange this request handle will use
-   */
-  struct TALER_EXCHANGE_Handle *exchange;
-
-  /**
-   * The url for this request.
-   */
-  char *url;
-
-  /**
-   * Context for #TEH_curl_easy_post(). Keeps the data that must
-   * persist for Curl to make the upload.
-   */
-  struct TALER_CURL_PostContext ctx;
-
-  /**
-   * Denomination key of the coin.
-   */
-  struct TALER_EXCHANGE_DenomPublicKey pk;
-
-  /**
-   * Handle for the request.
-   */
-  struct GNUNET_CURL_Job *job;
-
-  /**
-   * Function to call with the result.
-   */
-  TALER_EXCHANGE_PaybackResultCallback cb;
-
-  /**
-   * Closure for @a cb.
-   */
-  void *cb_cls;
-
-  /**
-   * Public key of the coin we are trying to get paid back.
-   */
-  struct TALER_CoinSpendPublicKeyP coin_pub;
-
-  /**
-   * #GNUNET_YES if the coin was refreshed
-   */
-  int was_refreshed;
-
-};
-
-
-/**
- * Verify that the signature on the "200 OK" response
- * from the exchange is valid. If it is, call the
- * callback.
- *
- * @param ph payback handle
- * @param json json reply with the signature
- * @return #GNUNET_OK if the signature is valid and we called the callback;
- *         #GNUNET_SYSERR if not (callback must still be called)
- */
-static int
-verify_payback_signature_ok (const struct TALER_EXCHANGE_PaybackHandle *ph,
-                             const json_t *json)
-{
-  struct TALER_PaybackConfirmationPS pc;
-  struct TALER_PaybackRefreshConfirmationPS pr;
-  struct TALER_ExchangePublicKeyP exchange_pub;
-  struct TALER_ExchangeSignatureP exchange_sig;
-  struct TALER_Amount amount;
-  struct GNUNET_TIME_Absolute timestamp;
-  const struct TALER_EXCHANGE_Keys *key_state;
-  struct GNUNET_JSON_Specification spec_withdraw[] = {
-    GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
-    GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub),
-    TALER_JSON_spec_amount ("amount", &amount),
-    GNUNET_JSON_spec_absolute_time ("timestamp", &timestamp),
-    GNUNET_JSON_spec_fixed_auto ("reserve_pub", &pc.reserve_pub),
-    GNUNET_JSON_spec_end ()
-  };
-  struct GNUNET_JSON_Specification spec_refresh[] = {
-    GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
-    GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub),
-    TALER_JSON_spec_amount ("amount", &amount),
-    GNUNET_JSON_spec_absolute_time ("timestamp", &timestamp),
-    GNUNET_JSON_spec_fixed_auto ("old_coin_pub", &pr.old_coin_pub),
-    GNUNET_JSON_spec_end ()
-  };
-
-  if (GNUNET_OK !=
-      GNUNET_JSON_parse (json,
-                         ph->was_refreshed ? spec_refresh : spec_withdraw,
-                         NULL, NULL))
-  {
-    GNUNET_break_op (0);
-    return GNUNET_SYSERR;
-  }
-  key_state = TALER_EXCHANGE_get_keys (ph->exchange);
-  if (GNUNET_OK !=
-      TALER_EXCHANGE_test_signing_key (key_state,
-                                       &exchange_pub))
-  {
-    GNUNET_break_op (0);
-    return GNUNET_SYSERR;
-  }
-  if (ph->was_refreshed)
-  {
-    pr.purpose.purpose = htonl (
-      TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK_REFRESH);
-    pr.purpose.size = htonl (sizeof (pr));
-    pr.timestamp = GNUNET_TIME_absolute_hton (timestamp);
-    TALER_amount_hton (&pr.payback_amount,
-                       &amount);
-    pr.coin_pub = ph->coin_pub;
-    if (GNUNET_OK !=
-        GNUNET_CRYPTO_eddsa_verify (
-          TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK_REFRESH,
-          &pr.purpose,
-          &exchange_sig.eddsa_signature,
-          &exchange_pub.eddsa_pub))
-    {
-      GNUNET_break_op (0);
-      return GNUNET_SYSERR;
-    }
-  }
-  else
-  {
-    pc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK);
-    pc.purpose.size = htonl (sizeof (pc));
-    pc.timestamp = GNUNET_TIME_absolute_hton (timestamp);
-    TALER_amount_hton (&pc.payback_amount,
-                       &amount);
-    pc.coin_pub = ph->coin_pub;
-    if (GNUNET_OK !=
-        GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK,
-                                    &pc.purpose,
-                                    &exchange_sig.eddsa_signature,
-                                    &exchange_pub.eddsa_pub))
-    {
-      GNUNET_break_op (0);
-      return GNUNET_SYSERR;
-    }
-  }
-  ph->cb (ph->cb_cls,
-          MHD_HTTP_OK,
-          TALER_EC_NONE,
-          &amount,
-          timestamp,
-          ph->was_refreshed ? NULL : &pc.reserve_pub,
-          ph->was_refreshed ? &pr.old_coin_pub : NULL,
-          json);
-  return GNUNET_OK;
-}
-
-
-/**
- * Function called when we're done processing the
- * HTTP /payback request.
- *
- * @param cls the `struct TALER_EXCHANGE_PaybackHandle`
- * @param response_code HTTP response code, 0 on error
- * @param response parsed JSON result, NULL on error
- */
-static void
-handle_payback_finished (void *cls,
-                         long response_code,
-                         const void *response)
-{
-  struct TALER_EXCHANGE_PaybackHandle *ph = cls;
-  const json_t *j = response;
-
-  ph->job = NULL;
-  switch (response_code)
-  {
-  case 0:
-    break;
-  case MHD_HTTP_OK:
-    if (GNUNET_OK !=
-        verify_payback_signature_ok (ph,
-                                     j))
-    {
-      GNUNET_break_op (0);
-      response_code = 0;
-      break;
-    }
-    TALER_EXCHANGE_payback_cancel (ph);
-    return;
-  case MHD_HTTP_BAD_REQUEST:
-    /* This should never happen, either us or the exchange is buggy
-       (or API version conflict); just pass JSON reply to the application */
-    break;
-  case MHD_HTTP_CONFLICT:
-    {
-      /* Insufficient funds, proof attached */
-      json_t *history;
-      struct TALER_Amount total;
-      const struct TALER_EXCHANGE_DenomPublicKey *dki;
-
-      dki = &ph->pk;
-      history = json_object_get (j,
-                                 "history");
-      if (GNUNET_OK !=
-          TALER_EXCHANGE_verify_coin_history (dki,
-                                              dki->fee_deposit.currency,
-                                              &ph->coin_pub,
-                                              history,
-                                              &total))
-      {
-        GNUNET_break_op (0);
-        response_code = 0;
-      }
-      ph->cb (ph->cb_cls,
-              response_code,
-              TALER_JSON_get_error_code (j),
-              &total,
-              GNUNET_TIME_UNIT_FOREVER_ABS,
-              NULL,
-              NULL,
-              j);
-      TALER_EXCHANGE_payback_cancel (ph);
-      return;
-    }
-  case MHD_HTTP_FORBIDDEN:
-    /* Nothing really to verify, exchange says one of the signatures is
-       invalid; as we checked them, this should never happen, we
-       should pass the JSON reply to the application */
-    break;
-  case MHD_HTTP_NOT_FOUND:
-    /* Nothing really to verify, this should never
-       happen, we should pass the JSON reply to the application */
-    break;
-  case MHD_HTTP_GONE:
-    /* Kind of normal: the money was already sent to the merchant
-       (it was too late for the refund). */
-    break;
-  case MHD_HTTP_INTERNAL_SERVER_ERROR:
-    /* Server had an internal issue; we should retry, but this API
-       leaves this to the application */
-    break;
-  default:
-    /* unexpected response code */
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Unexpected response code %u\n",
-                (unsigned int) response_code);
-    GNUNET_break (0);
-    response_code = 0;
-    break;
-  }
-  ph->cb (ph->cb_cls,
-          response_code,
-          TALER_JSON_get_error_code (j),
-          NULL,
-          GNUNET_TIME_UNIT_FOREVER_ABS,
-          NULL,
-          NULL,
-          j);
-  TALER_EXCHANGE_payback_cancel (ph);
-}
-
-
-/**
- * Ask the exchange to pay back a coin due to the exchange triggering
- * the emergency payback protocol for a given denomination.  The value
- * of the coin will be refunded to the original customer (without fees).
- *
- * @param exchange the exchange handle; the exchange must be ready to operate
- * @param pk kind of coin to pay back
- * @param denom_sig signature over the coin by the exchange using @a pk
- * @param ps secret internals of the original planchet
- * @param was_refreshed #GNUNET_YES if the coin in @a ps was refreshed
- * @param payback_cb the callback to call when the final result for this request is available
- * @param payback_cb_cls closure for @a payback_cb
- * @return NULL
- *         if the inputs are invalid (i.e. denomination key not with this exchange).
- *         In this case, the callback is not called.
- */
-struct TALER_EXCHANGE_PaybackHandle *
-TALER_EXCHANGE_payback (struct TALER_EXCHANGE_Handle *exchange,
-                        const struct TALER_EXCHANGE_DenomPublicKey *pk,
-                        const struct TALER_DenominationSignature *denom_sig,
-                        const struct TALER_PlanchetSecretsP *ps,
-                        int was_refreshed,
-                        TALER_EXCHANGE_PaybackResultCallback payback_cb,
-                        void *payback_cb_cls)
-{
-  struct TALER_EXCHANGE_PaybackHandle *ph;
-  struct GNUNET_CURL_Context *ctx;
-  struct TALER_PaybackRequestPS pr;
-  struct TALER_CoinSpendSignatureP coin_sig;
-  struct GNUNET_HashCode h_denom_pub;
-  json_t *payback_obj;
-  CURL *eh;
-
-  GNUNET_assert (GNUNET_YES ==
-                 TEAH_handle_is_ready (exchange));
-  pr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_PAYBACK);
-  pr.purpose.size = htonl (sizeof (struct TALER_PaybackRequestPS));
-  GNUNET_CRYPTO_eddsa_key_get_public (&ps->coin_priv.eddsa_priv,
-                                      &pr.coin_pub.eddsa_pub);
-  GNUNET_CRYPTO_rsa_public_key_hash (pk->key.rsa_public_key,
-                                     &h_denom_pub);
-  pr.h_denom_pub = pk->h_key;
-  pr.coin_blind = ps->blinding_key;
-  GNUNET_assert (GNUNET_OK ==
-                 GNUNET_CRYPTO_eddsa_sign (&ps->coin_priv.eddsa_priv,
-                                           &pr.purpose,
-                                           &coin_sig.eddsa_signature));
-
-  payback_obj = json_pack ("{s:o, s:o," /* denom pub/sig */
-                           " s:o, s:o," /* coin pub/sig */
-                           " s:o, s:o}", /* coin_bks */
-                           "denom_pub_hash", GNUNET_JSON_from_data_auto (
-                             &h_denom_pub),
-                           "denom_sig", GNUNET_JSON_from_rsa_signature (
-                             denom_sig->rsa_signature),
-                           "coin_pub", GNUNET_JSON_from_data_auto (
-                             &pr.coin_pub),
-                           "coin_sig", GNUNET_JSON_from_data_auto (&coin_sig),
-                           "coin_blind_key_secret", GNUNET_JSON_from_data_auto (
-                             &ps->blinding_key),
-                           "refreshed", json_boolean (was_refreshed)
-                           );
-  if (NULL == payback_obj)
-  {
-    GNUNET_break (0);
-    return NULL;
-  }
-
-  ph = GNUNET_new (struct TALER_EXCHANGE_PaybackHandle);
-  ph->coin_pub = pr.coin_pub;
-  ph->exchange = exchange;
-  ph->pk = *pk;
-  ph->pk.key.rsa_public_key = NULL; /* zero out, as lifetime cannot be warranted */
-  ph->cb = payback_cb;
-  ph->cb_cls = payback_cb_cls;
-  ph->url = TEAH_path_to_url (exchange, "/payback");
-  ph->was_refreshed = was_refreshed;
-  eh = TEL_curl_easy_get (ph->url);
-  if (GNUNET_OK !=
-      TALER_curl_easy_post (&ph->ctx,
-                            eh,
-                            payback_obj))
-  {
-    GNUNET_break (0);
-    curl_easy_cleanup (eh);
-    json_decref (payback_obj);
-    GNUNET_free (ph->url);
-    GNUNET_free (ph);
-    return NULL;
-  }
-  json_decref (payback_obj);
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-              "URL for payback: `%s'\n",
-              ph->url);
-  ctx = TEAH_handle_to_context (exchange);
-  ph->job = GNUNET_CURL_job_add2 (ctx,
-                                  eh,
-                                  ph->ctx.headers,
-                                  &handle_payback_finished,
-                                  ph);
-  return ph;
-}
-
-
-/**
- * Cancel a payback request.  This function cannot be used on a
- * request handle if the callback was already invoked.
- *
- * @param ph the payback handle
- */
-void
-TALER_EXCHANGE_payback_cancel (struct TALER_EXCHANGE_PaybackHandle *ph)
-{
-  if (NULL != ph->job)
-  {
-    GNUNET_CURL_job_cancel (ph->job);
-    ph->job = NULL;
-  }
-  GNUNET_free (ph->url);
-  TALER_curl_easy_post_finished (&ph->ctx);
-  GNUNET_free (ph);
-}
-
-
-/* end of exchange_api_payback.c */