-exchange_api_batch_deposit.c compiles

contrib/gana

@@ -1 +1 @@
-Subproject commit ce57f1bb32a657c0e479a13401339c9899b1c898
+Subproject commit 75c838e74c41bf9a6c02cdfe8109a444056bf26d

doc/prebuilt

@@ -1 +1 @@
-Subproject commit 1ed97b23f19c80fa84b21a5eb0c686d5491e8ec6
+Subproject commit 74d9c44ebc257a3d8b9c2c0a806508bd0cc5269a

src/exchange/taler-exchange-httpd_keys.c

@@ -2216,10 +2216,10 @@ finish_keys_response (struct TEH_KeyStateHandle *ksh)
           switch (meta.cipher)
           {
           case TALER_DENOMINATION_RSA:
-            cipher = age_restricted ? "RSA+age_restricted": "RSA";
+            cipher = age_restricted ? "RSA+age_restricted" : "RSA";
             break;
           case TALER_DENOMINATION_CS:
-            cipher = age_restricted ? "CS+age_restricted": "CS";
+            cipher = age_restricted ? "CS+age_restricted" : "CS";
             break;
           default:
             GNUNET_assert (false);

src/include/taler_exchange_service.h

@@ -1047,6 +1047,144 @@ void
 TALER_EXCHANGE_deposit_cancel (struct TALER_EXCHANGE_DepositHandle *deposit);
 
 
+/**
+ * @brief A Batch Deposit Handle
+ */
+struct TALER_EXCHANGE_BatchDepositHandle;
+
+
+/**
+ * Structure with information about a batch deposit
+ * operation's result.
+ */
+struct TALER_EXCHANGE_BatchDepositResult
+{
+  /**
+   * HTTP response data
+   */
+  struct TALER_EXCHANGE_HttpResponse hr;
+
+  union
+  {
+
+    /**
+     * Information returned if the HTTP status is
+     * #MHD_HTTP_OK.
+     */
+    struct
+    {
+      /**
+       * Time when the exchange generated the batch deposit confirmation
+       */
+      struct GNUNET_TIME_Timestamp deposit_timestamp;
+
+      /**
+       * Array of signatures provided by the exchange
+       */
+      const struct TALER_ExchangeSignatureP *exchange_sigs;
+
+      /**
+       * exchange key used to sign @a exchange_sig.
+       */
+      const struct TALER_ExchangePublicKeyP *exchange_pub;
+
+      /**
+       * Base URL for looking up wire transfers, or
+       * NULL to use the default base URL.
+       */
+      const char *transaction_base_url;
+
+      /**
+       * Length of the @e exchange_sigs array.
+       */
+      unsigned int num_signatures;
+
+    } success;
+
+    /**
+     * Information returned if the HTTP status is
+     * #MHD_HTTP_CONFLICT.
+     */
+    struct
+    {
+      /* TODO: returning full details is not implemented */
+    } conflict;
+
+  } details;
+};
+
+
+/**
+ * Callbacks of this type are used to serve the result of submitting a
+ * deposit permission request to a exchange.
+ *
+ * @param cls closure
+ * @param dr deposit response details
+ */
+typedef void
+(*TALER_EXCHANGE_BatchDepositResultCallback) (
+  void *cls,
+  const struct TALER_EXCHANGE_BatchDepositResult *dr);
+
+
+/**
+ * Submit a batch of deposit permissions to the exchange and get the
+ * exchange's response.  This API is typically used by a merchant.  Note that
+ * while we return the response verbatim to the caller for further processing,
+ * we do already verify that the response is well-formed (i.e. that signatures
+ * included in the response are all valid).  If the exchange's reply is not
+ * well-formed, we return an HTTP status code of zero to @a cb.
+ *
+ * We also verify that the @a cdds.coin_sig are valid for this deposit
+ * request, and that the @a cdds.ub_sig are a valid signatures for @a
+ * coin_pub.  Also, the @a exchange must be ready to operate (i.e.  have
+ * finished processing the /keys reply).  If either check fails, we do
+ * NOT initiate the transaction with the exchange and instead return NULL.
+ *
+ * @param exchange the exchange handle; the exchange must be ready to operate
+ * @param dcd details about the contract the deposit is for
+ * @param num_cdds length of the @a cdds array
+ * @param cdds array with details about the coins to be deposited
+ * @param cb the callback to call when a reply for this request is available
+ * @param cb_cls closure for the above callback
+ * @param[out] ec if NULL is returned, set to the error code explaining why the operation failed
+ * @return a handle for this request; NULL if the inputs are invalid (i.e.
+ *         signatures fail to verify).  In this case, the callback is not called.
+ */
+struct TALER_EXCHANGE_BatchDepositHandle *
+TALER_EXCHANGE_batch_deposit (
+  struct TALER_EXCHANGE_Handle *exchange,
+  const struct TALER_EXCHANGE_DepositContractDetail *dcd,
+  unsigned int num_cdds,
+  const struct TALER_EXCHANGE_CoinDepositDetail *cdds,
+  TALER_EXCHANGE_BatchDepositResultCallback cb,
+  void *cb_cls,
+  enum TALER_ErrorCode *ec);
+
+
+/**
+ * Change the chance that our deposit confirmation will be given to the
+ * auditor to 100%.
+ *
+ * @param deposit the batch deposit permission request handle
+ */
+void
+TALER_EXCHANGE_batch_deposit_force_dc (struct
+                                       TALER_EXCHANGE_BatchDepositHandle *
+                                       deposit);
+
+
+/**
+ * Cancel a batch deposit permission request.  This function cannot be used
+ * on a request handle if a response is already served for it.
+ *
+ * @param deposit the deposit permission request handle
+ */
+void
+TALER_EXCHANGE_batch_deposit_cancel (struct
+                                     TALER_EXCHANGE_BatchDepositHandle *deposit);
+
+
 /* *********************  /coins/$COIN_PUB/refund *********************** */
 
 /**

src/lib/Makefile.am

@@ -22,6 +22,7 @@ libtalerexchange_la_LDFLAGS = \
   -no-undefined
 libtalerexchange_la_SOURCES = \
   exchange_api_auditor_add_denomination.c \
+  exchange_api_batch_deposit.c \
   exchange_api_batch_withdraw.c \
   exchange_api_batch_withdraw2.c \
   exchange_api_curl_defaults.c exchange_api_curl_defaults.h \

src/lib/exchange_api_batch_deposit.c

@@ -0,0 +1,647 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2014-2022 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/exchange_api_batch_deposit.c
+ * @brief Implementation of the /batch-deposit request of the exchange's HTTP API
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ * @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_auditor_service.h"
+#include "taler_exchange_service.h"
+#include "exchange_api_common.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * 1:#AUDITOR_CHANCE is the probability that we report deposits
+ * to the auditor.
+ *
+ * 20==5% of going to auditor. This is possibly still too high, but set
+ * deliberately this high for testing
+ */
+#define AUDITOR_CHANCE 20
+
+/**
+ * @brief A Deposit Handle
+ */
+struct TALER_EXCHANGE_BatchDepositHandle
+{
+
+  /**
+   * 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;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_EXCHANGE_BatchDepositResultCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Details about the contract.
+   */
+  struct TALER_EXCHANGE_DepositContractDetail dcd;
+
+  /**
+   * Array with details about the coins.
+   */
+  struct TALER_EXCHANGE_CoinDepositDetail *cdds;
+
+  /**
+   * Hash of the merchant's wire details.
+   */
+  struct TALER_MerchantWireHashP h_wire;
+
+  /**
+   * Hash over the extensions, or all zero.
+   */
+  struct TALER_ExtensionContractHashP h_extensions;
+
+  /**
+   * Time when this confirmation was generated / when the exchange received
+   * the deposit request.
+   */
+  struct GNUNET_TIME_Timestamp exchange_timestamp;
+
+  /**
+   * Exchange signatures, set for #auditor_cb.
+   */
+  struct TALER_ExchangeSignatureP *exchange_sigs;
+
+  /**
+   * Exchange signing public key, set for #auditor_cb.
+   */
+  struct TALER_ExchangePublicKeyP exchange_pub;
+
+  /**
+   * Chance that we will inform the auditor about the deposit
+   * is 1:n, where the value of this field is "n".
+   */
+  unsigned int auditor_chance;
+
+  /**
+   * Length of the @e cdds array.
+   */
+  unsigned int num_cdds;
+
+};
+
+
+/**
+ * Function called for each auditor to give us a chance to possibly
+ * launch a deposit confirmation interaction.
+ *
+ * @param cls closure
+ * @param ah handle to the auditor
+ * @param auditor_pub public key of the auditor
+ * @return NULL if no deposit confirmation interaction was launched
+ */
+static struct TEAH_AuditorInteractionEntry *
+auditor_cb (void *cls,
+            struct TALER_AUDITOR_Handle *ah,
+            const struct TALER_AuditorPublicKeyP *auditor_pub)
+{
+  struct TALER_EXCHANGE_BatchDepositHandle *dh = cls;
+  const struct TALER_EXCHANGE_Keys *key_state;
+  const struct TALER_EXCHANGE_SigningPublicKey *spk;
+  struct TEAH_AuditorInteractionEntry *aie;
+  struct TALER_Amount amount_without_fee;
+  const struct TALER_EXCHANGE_DenomPublicKey *dki;
+  unsigned int coin;
+
+  if (0 !=
+      GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+                                dh->auditor_chance))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                "Not providing deposit confirmation to auditor\n");
+    return NULL;
+  }
+  coin = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+                                   dh->num_cdds);
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+              "Will provide deposit confirmation to auditor `%s'\n",
+              TALER_B2S (auditor_pub));
+  key_state = TALER_EXCHANGE_get_keys (dh->exchange);
+  dki = TALER_EXCHANGE_get_denomination_key_by_hash (key_state,
+                                                     &dh->cdds[coin].h_denom_pub);
+  GNUNET_assert (NULL != dki);
+  spk = TALER_EXCHANGE_get_signing_key_info (key_state,
+                                             &dh->exchange_pub);
+  if (NULL == spk)
+  {
+    GNUNET_break_op (0);
+    return NULL;
+  }
+  GNUNET_assert (0 <=
+                 TALER_amount_subtract (&amount_without_fee,
+                                        &dh->cdds[coin].amount,
+                                        &dki->fees.deposit));
+  aie = GNUNET_new (struct TEAH_AuditorInteractionEntry);
+  aie->dch = TALER_AUDITOR_deposit_confirmation (
+    ah,
+    &dh->h_wire,
+    &dh->h_extensions,
+    &dh->dcd.h_contract_terms,
+    dh->exchange_timestamp,
+    dh->dcd.wire_deadline,
+    dh->dcd.refund_deadline,
+    &amount_without_fee,
+    &dh->cdds[coin].coin_pub,
+    &dh->dcd.merchant_pub,
+    &dh->exchange_pub,
+    &dh->exchange_sigs[coin],
+    &key_state->master_pub,
+    spk->valid_from,
+    spk->valid_until,
+    spk->valid_legal,
+    &spk->master_sig,
+    &TEAH_acc_confirmation_cb,
+    aie);
+  return aie;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /deposit request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_BatchDepositHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_deposit_finished (void *cls,
+                         long response_code,
+                         const void *response)
+{
+  struct TALER_EXCHANGE_BatchDepositHandle *dh = cls;
+  const json_t *j = response;
+  struct TALER_EXCHANGE_BatchDepositResult dr = {
+    .hr.reply = j,
+    .hr.http_status = (unsigned int) response_code
+  };
+  const struct TALER_EXCHANGE_Keys *keys;
+
+  dh->job = NULL;
+  keys = TALER_EXCHANGE_get_keys (dh->exchange);
+  switch (response_code)
+  {
+  case 0:
+    dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+    break;
+  case MHD_HTTP_OK:
+    {
+      const struct TALER_EXCHANGE_Keys *key_state;
+      json_t *sigs;
+      json_t *sig;
+      unsigned int idx;
+      struct GNUNET_JSON_Specification spec[] = {
+        GNUNET_JSON_spec_json ("exchange_sigs",
+                               &sigs),
+        GNUNET_JSON_spec_fixed_auto ("exchange_pub",
+                                     &dh->exchange_pub),
+        GNUNET_JSON_spec_mark_optional (
+          GNUNET_JSON_spec_string ("transaction_base_url",
+                                   &dr.details.success.transaction_base_url),
+          NULL),
+        GNUNET_JSON_spec_timestamp ("exchange_timestamp",
+                                    &dh->exchange_timestamp),
+        GNUNET_JSON_spec_end ()
+      };
+
+      if (GNUNET_OK !=
+          GNUNET_JSON_parse (j,
+                             spec,
+                             NULL, NULL))
+      {
+        GNUNET_break_op (0);
+        dr.hr.http_status = 0;
+        dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+        break;
+      }
+      if (json_array_size (sigs) != dh->num_cdds)
+      {
+        GNUNET_break_op (0);
+        dr.hr.http_status = 0;
+        dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+        break;
+      }
+      dh->exchange_sigs = GNUNET_new_array (dh->num_cdds,
+                                            struct TALER_ExchangeSignatureP);
+      key_state = TALER_EXCHANGE_get_keys (dh->exchange);
+      if (GNUNET_OK !=
+          TALER_EXCHANGE_test_signing_key (key_state,
+                                           &dh->exchange_pub))
+      {
+        GNUNET_break_op (0);
+        dr.hr.http_status = 0;
+        dr.hr.ec = TALER_EC_EXCHANGE_DEPOSIT_INVALID_SIGNATURE_BY_EXCHANGE;
+        break;
+      }
+      json_array_foreach (sigs, idx, sig)
+      {
+        struct GNUNET_JSON_Specification ispec[] = {
+          GNUNET_JSON_spec_fixed_auto ("exchange_sig",
+                                       &dh->exchange_sigs[idx]),
+          GNUNET_JSON_spec_end ()
+        };
+        struct TALER_Amount amount_without_fee;
+        const struct TALER_EXCHANGE_DenomPublicKey *dki;
+
+        if (GNUNET_OK !=
+            GNUNET_JSON_parse (sig,
+                               ispec,
+                               NULL, NULL))
+        {
+          GNUNET_break_op (0);
+          dr.hr.http_status = 0;
+          dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+          GNUNET_JSON_parse_free (spec);
+          break;
+        }
+        dki = TALER_EXCHANGE_get_denomination_key_by_hash (key_state,
+                                                           &dh->cdds[idx].
+                                                           h_denom_pub);
+        GNUNET_assert (NULL != dki);
+        GNUNET_assert (0 <=
+                       TALER_amount_subtract (&amount_without_fee,
+                                              &dh->cdds[idx].amount,
+                                              &dki->fees.deposit));
+
+        if (GNUNET_OK !=
+            TALER_exchange_online_deposit_confirmation_verify (
+              &dh->dcd.h_contract_terms,
+              &dh->h_wire,
+              &dh->h_extensions,
+              dh->exchange_timestamp,
+              dh->dcd.wire_deadline,
+              dh->dcd.refund_deadline,
+              &amount_without_fee,
+              &dh->cdds[idx].coin_pub,
+              &dh->dcd.merchant_pub,
+              &dh->exchange_pub,
+              &dh->exchange_sigs[idx]))
+        {
+          GNUNET_break_op (0);
+          dr.hr.http_status = 0;
+          dr.hr.ec = TALER_EC_EXCHANGE_DEPOSIT_INVALID_SIGNATURE_BY_EXCHANGE;
+          break;
+        }
+      }
+      TEAH_get_auditors_for_dc (dh->exchange,
+                                &auditor_cb,
+                                dh);
+    }
+    dr.details.success.exchange_sigs = dh->exchange_sigs;
+    dr.details.success.exchange_pub = &dh->exchange_pub;
+    dr.details.success.deposit_timestamp = dh->exchange_timestamp;
+    dr.details.success.num_signatures = dh->num_cdds;
+    break;
+  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 */
+    dr.hr.ec = TALER_JSON_get_error_code (j);
+    dr.hr.hint = TALER_JSON_get_error_hint (j);
+    break;
+  case MHD_HTTP_FORBIDDEN:
+    dr.hr.ec = TALER_JSON_get_error_code (j);
+    dr.hr.hint = TALER_JSON_get_error_hint (j);
+    /* 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:
+    dr.hr.ec = TALER_JSON_get_error_code (j);
+    dr.hr.hint = TALER_JSON_get_error_hint (j);
+    /* Nothing really to verify, this should never
+       happen, we should pass the JSON reply to the application */
+    break;
+  case MHD_HTTP_CONFLICT:
+    {
+      const struct TALER_EXCHANGE_Keys *key_state;
+      struct TALER_CoinSpendPublicKeyP coin_pub;
+      struct GNUNET_JSON_Specification spec[] = {
+        GNUNET_JSON_spec_fixed_auto ("coin_pub",
+                                     &coin_pub),
+        GNUNET_JSON_spec_end ()
+      };
+      const struct TALER_EXCHANGE_DenomPublicKey *dki;
+      bool found = false;
+
+      if (GNUNET_OK !=
+          GNUNET_JSON_parse (j,
+                             spec,
+                             NULL, NULL))
+      {
+        GNUNET_break_op (0);
+        dr.hr.http_status = 0;
+        dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+        break;
+      }
+      for (unsigned int i = 0; i<dh->num_cdds; i++)
+      {
+        if (0 !=
+            GNUNET_memcmp (&coin_pub,
+                           &dh->cdds[i].coin_pub))
+          continue;
+        key_state = TALER_EXCHANGE_get_keys (dh->exchange);
+        dki = TALER_EXCHANGE_get_denomination_key_by_hash (key_state,
+                                                           &dh->cdds[i].
+                                                           h_denom_pub);
+        GNUNET_assert (NULL != dki);
+        if (GNUNET_OK !=
+            TALER_EXCHANGE_check_coin_conflict_ (
+              keys,
+              j,
+              dki,
+              &dh->cdds[i].coin_pub,
+              &dh->cdds[i].coin_sig,
+              &dh->cdds[i].amount))
+        {
+          GNUNET_break_op (0);
+          dr.hr.http_status = 0;
+          dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+          break;
+        }
+        found = true;
+        break;
+      }
+      if (! found)
+      {
+        GNUNET_break_op (0);
+        dr.hr.http_status = 0;
+        dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+        break;
+      }
+      dr.hr.ec = TALER_JSON_get_error_code (j);
+      dr.hr.hint = TALER_JSON_get_error_hint (j);
+    }
+    break;
+  case MHD_HTTP_GONE:
+    /* could happen if denomination was revoked */
+    /* Note: one might want to check /keys for revocation
+       signature here, alas tricky in case our /keys
+       is outdated => left to clients */
+    dr.hr.ec = TALER_JSON_get_error_code (j);
+    dr.hr.hint = TALER_JSON_get_error_hint (j);
+    break;
+  case MHD_HTTP_INTERNAL_SERVER_ERROR:
+    dr.hr.ec = TALER_JSON_get_error_code (j);
+    dr.hr.hint = TALER_JSON_get_error_hint (j);
+    /* Server had an internal issue; we should retry, but this API
+       leaves this to the application */
+    break;
+  default:
+    /* unexpected response code */
+    dr.hr.ec = TALER_JSON_get_error_code (j);
+    dr.hr.hint = TALER_JSON_get_error_hint (j);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u/%d for exchange deposit\n",
+                (unsigned int) response_code,
+                dr.hr.ec);
+    GNUNET_break_op (0);
+    break;
+  }
+  dh->cb (dh->cb_cls,
+          &dr);
+  TALER_EXCHANGE_batch_deposit_cancel (dh);
+}
+
+
+struct TALER_EXCHANGE_BatchDepositHandle *
+TALER_EXCHANGE_batch_deposit (
+  struct TALER_EXCHANGE_Handle *exchange,
+  const struct TALER_EXCHANGE_DepositContractDetail *dcd,
+  unsigned int num_cdds,
+  const struct TALER_EXCHANGE_CoinDepositDetail *cdds,
+  TALER_EXCHANGE_BatchDepositResultCallback cb,
+  void *cb_cls,
+  enum TALER_ErrorCode *ec)
+{
+  const struct TALER_EXCHANGE_Keys *key_state;
+  struct TALER_EXCHANGE_BatchDepositHandle *dh;
+  struct GNUNET_CURL_Context *ctx;
+  json_t *deposit_obj;
+  json_t *deposits;
+  CURL *eh;
+  struct TALER_Amount amount_without_fee;
+
+  GNUNET_assert (GNUNET_YES ==
+                 TEAH_handle_is_ready (exchange));
+  if (GNUNET_TIME_timestamp_cmp (dcd->refund_deadline,
+                                 >,
+                                 dcd->wire_deadline))
+  {
+    GNUNET_break_op (0);
+    *ec = TALER_EC_EXCHANGE_DEPOSIT_REFUND_DEADLINE_AFTER_WIRE_DEADLINE;
+    return NULL;
+  }
+  key_state = TALER_EXCHANGE_get_keys (exchange);
+  dh = GNUNET_new (struct TALER_EXCHANGE_BatchDepositHandle);
+  dh->auditor_chance = AUDITOR_CHANCE;
+  dh->exchange = exchange;
+  dh->cb = cb;
+  dh->cb_cls = cb_cls;
+  dh->cdds = GNUNET_memdup (cdds,
+                            num_cdds
+                            * sizeof (*cdds));
+  dh->num_cdds = num_cdds;
+  dh->dcd = *dcd;
+  if (NULL != dcd->extension_details)
+    TALER_deposit_extension_hash (dcd->extension_details,
+                                  &dh->h_extensions);
+  TALER_merchant_wire_signature_hash (dcd->merchant_payto_uri,
+                                      &dcd->wire_salt,
+                                      &dh->h_wire);
+  deposits = json_array ();
+  GNUNET_assert (NULL != deposits);
+  for (unsigned int i = 0; i<num_cdds; i++)
+  {
+    const struct TALER_EXCHANGE_CoinDepositDetail *cdd = &cdds[i];
+    const struct TALER_EXCHANGE_DenomPublicKey *dki;
+
+    dki = TALER_EXCHANGE_get_denomination_key_by_hash (key_state,
+                                                       &cdd->h_denom_pub);
+    if (NULL == dki)
+    {
+      *ec = TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN;
+      GNUNET_break_op (0);
+      return NULL;
+    }
+    if (0 >
+        TALER_amount_subtract (&amount_without_fee,
+                               &cdd->amount,
+                               &dki->fees.deposit))
+    {
+      *ec = TALER_EC_EXCHANGE_DEPOSIT_FEE_ABOVE_AMOUNT;
+      GNUNET_break_op (0);
+      GNUNET_free (dh->cdds);
+      GNUNET_free (dh);
+      return NULL;
+    }
+
+    if (GNUNET_OK !=
+        TALER_EXCHANGE_verify_deposit_signature_ (dcd,
+                                                  &dh->h_extensions,
+                                                  &dh->h_wire,
+                                                  cdd,
+                                                  dki))
+    {
+      *ec = TALER_EC_EXCHANGE_DEPOSIT_COIN_SIGNATURE_INVALID;
+      GNUNET_break_op (0);
+      GNUNET_free (dh->cdds);
+      GNUNET_free (dh);
+      return NULL;
+    }
+    GNUNET_assert (
+      0 ==
+      json_array_append_new (
+        deposits,
+        GNUNET_JSON_PACK (
+          TALER_JSON_pack_amount ("contribution",
+                                  &cdd->amount),
+          GNUNET_JSON_pack_allow_null (
+            GNUNET_JSON_pack_data_auto ("h_age_commitment",
+                                        &cdd->h_age_commitment)),
+          GNUNET_JSON_pack_data_auto ("denom_pub_hash",
+                                      &cdd->h_denom_pub),
+          TALER_JSON_pack_denom_sig ("ub_sig",
+                                     &cdd->denom_sig),
+          GNUNET_JSON_pack_data_auto ("coin_sig",
+                                      &cdd->coin_sig)
+          )));
+  }
+  dh->url = TEAH_path_to_url (exchange,
+                              "/batch-deposit");
+  if (NULL == dh->url)
+  {
+    GNUNET_break (0);
+    *ec = TALER_EC_GENERIC_ALLOCATION_FAILURE;
+    GNUNET_free (dh->url);
+    GNUNET_free (dh->cdds);
+    GNUNET_free (dh);
+    return NULL;
+  }
+
+  deposit_obj = GNUNET_JSON_PACK (
+    GNUNET_JSON_pack_array_steal ("coins",
+                                  deposits),
+    GNUNET_JSON_pack_string ("merchant_payto_uri",
+                             dcd->merchant_payto_uri),
+    GNUNET_JSON_pack_data_auto ("wire_salt",
+                                &dcd->wire_salt),
+    GNUNET_JSON_pack_data_auto ("h_contract_terms",
+                                &dcd->h_contract_terms),
+    GNUNET_JSON_pack_timestamp ("timestamp",
+                                dcd->timestamp),
+    GNUNET_JSON_pack_data_auto ("merchant_pub",
+                                &dcd->merchant_pub),
+    GNUNET_JSON_pack_allow_null (
+      GNUNET_JSON_pack_timestamp ("refund_deadline",
+                                  dcd->refund_deadline)),
+    GNUNET_JSON_pack_timestamp ("wire_transfer_deadline",
+                                dcd->wire_deadline));
+  GNUNET_assert (NULL != deposit_obj);
+  eh = TALER_EXCHANGE_curl_easy_get_ (dh->url);
+  if ( (NULL == eh) ||
+       (GNUNET_OK !=
+        TALER_curl_easy_post (&dh->ctx,
+                              eh,
+                              deposit_obj)) )
+  {
+    *ec = TALER_EC_GENERIC_CURL_ALLOCATION_FAILURE;
+    GNUNET_break (0);
+    if (NULL != eh)
+      curl_easy_cleanup (eh);
+    json_decref (deposit_obj);
+    GNUNET_free (dh->cdds);
+    GNUNET_free (dh->url);
+    GNUNET_free (dh);
+    return NULL;
+  }
+  json_decref (deposit_obj);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "URL for deposit: `%s'\n",
+              dh->url);
+  ctx = TEAH_handle_to_context (exchange);
+  dh->job = GNUNET_CURL_job_add2 (ctx,
+                                  eh,
+                                  dh->ctx.headers,
+                                  &handle_deposit_finished,
+                                  dh);
+  return dh;
+}
+
+
+void
+TALER_EXCHANGE_batch_deposit_force_dc (struct
+                                       TALER_EXCHANGE_BatchDepositHandle *
+                                       deposit)
+{
+  deposit->auditor_chance = 1;
+}
+
+
+void
+TALER_EXCHANGE_batch_deposit_cancel (struct
+                                     TALER_EXCHANGE_BatchDepositHandle *deposit)
+{
+  if (NULL != deposit->job)
+  {
+    GNUNET_CURL_job_cancel (deposit->job);
+    deposit->job = NULL;
+  }
+  GNUNET_free (deposit->url);
+  GNUNET_free (deposit->cdds);
+  GNUNET_free (deposit->exchange_sigs);
+  TALER_curl_easy_post_finished (&deposit->ctx);
+  GNUNET_free (deposit);
+}
+
+
+/* end of exchange_api_batch_deposit.c */

src/lib/exchange_api_common.c

@@ -1946,4 +1946,66 @@ TALER_EXCHANGE_get_min_denomination_ (
 }
 
 
+enum GNUNET_GenericReturnValue
+TALER_EXCHANGE_verify_deposit_signature_ (
+  const struct TALER_EXCHANGE_DepositContractDetail *dcd,
+  const struct TALER_ExtensionContractHashP *ech,
+  const struct TALER_MerchantWireHashP *h_wire,
+  const struct TALER_EXCHANGE_CoinDepositDetail *cdd,
+  const struct TALER_EXCHANGE_DenomPublicKey *dki)
+{
+  if (GNUNET_OK !=
+      TALER_wallet_deposit_verify (&cdd->amount,
+                                   &dki->fees.deposit,
+                                   h_wire,
+                                   &dcd->h_contract_terms,
+                                   &cdd->h_age_commitment,
+                                   ech,
+                                   &cdd->h_denom_pub,
+                                   dcd->timestamp,
+                                   &dcd->merchant_pub,
+                                   dcd->refund_deadline,
+                                   &cdd->coin_pub,
+                                   &cdd->coin_sig))
+  {
+    GNUNET_break_op (0);
+    TALER_LOG_WARNING ("Invalid coin signature on /deposit request!\n");
+    TALER_LOG_DEBUG ("... amount_with_fee was %s\n",
+                     TALER_amount2s (&cdd->amount));
+    TALER_LOG_DEBUG ("... deposit_fee was %s\n",
+                     TALER_amount2s (&dki->fees.deposit));
+    return GNUNET_SYSERR;
+  }
+
+  /* check coin signature */
+  {
+    struct TALER_CoinPublicInfo coin_info = {
+      .coin_pub = cdd->coin_pub,
+      .denom_pub_hash = cdd->h_denom_pub,
+      .denom_sig = cdd->denom_sig,
+      .h_age_commitment = cdd->h_age_commitment,
+    };
+
+    if (GNUNET_YES !=
+        TALER_test_coin_valid (&coin_info,
+                               &dki->key))
+    {
+      GNUNET_break_op (0);
+      TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
+      return GNUNET_SYSERR;
+    }
+  }
+
+  /* Check coin does make a contribution */
+  if (0 < TALER_amount_cmp (&dki->fees.deposit,
+                            &cdd->amount))
+  {
+    GNUNET_break_op (0);
+    TALER_LOG_WARNING ("Deposit amount smaller than fee\n");
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
+
 /* end of exchange_api_common.c */

src/lib/exchange_api_common.h

@@ -198,4 +198,24 @@ TALER_EXCHANGE_get_min_denomination_ (
   const struct TALER_EXCHANGE_Keys *keys,
   struct TALER_Amount *min);
 
+
+/**
+ * Verify signature information about the deposit.
+ *
+ * @param dcd contract details
+ * @param ech hashed contract (passed to avoid recomputation)
+ * @param h_wire hashed wire details (passed to avoid recomputation)
+ * @param cdd coin-specific details
+ * @param dki denomination of the coin
+ * @return #GNUNET_OK if signatures are OK, #GNUNET_SYSERR if not
+ */
+enum GNUNET_GenericReturnValue
+TALER_EXCHANGE_verify_deposit_signature_ (
+  const struct TALER_EXCHANGE_DepositContractDetail *dcd,
+  const struct TALER_ExtensionContractHashP *ech,
+  const struct TALER_MerchantWireHashP *h_wire,
+  const struct TALER_EXCHANGE_CoinDepositDetail *cdd,
+  const struct TALER_EXCHANGE_DenomPublicKey *dki);
+
+
 #endif

src/lib/exchange_api_deposit.c

@@ -378,77 +378,6 @@ handle_deposit_finished (void *cls,
 }
 
 
-/**
- * Verify signature information about the deposit.
- *
- * @param dcd contract details
- * @param ech hashed contract (passed to avoid recomputation)
- * @param h_wire hashed wire details (passed to avoid recomputation)
- * @param cdd coin-specific details
- * @param dki denomination of the coin
- * @return #GNUNET_OK if signatures are OK, #GNUNET_SYSERR if not
- */
-static enum GNUNET_GenericReturnValue
-verify_signatures (const struct TALER_EXCHANGE_DepositContractDetail *dcd,
-                   const struct TALER_ExtensionContractHashP *ech,
-                   const struct TALER_MerchantWireHashP *h_wire,
-                   const struct TALER_EXCHANGE_CoinDepositDetail *cdd,
-                   const struct TALER_EXCHANGE_DenomPublicKey *dki)
-{
-  if (GNUNET_OK !=
-      TALER_wallet_deposit_verify (&cdd->amount,
-                                   &dki->fees.deposit,
-                                   h_wire,
-                                   &dcd->h_contract_terms,
-                                   &cdd->h_age_commitment,
-                                   ech,
-                                   &cdd->h_denom_pub,
-                                   dcd->timestamp,
-                                   &dcd->merchant_pub,
-                                   dcd->refund_deadline,
-                                   &cdd->coin_pub,
-                                   &cdd->coin_sig))
-  {
-    GNUNET_break_op (0);
-    TALER_LOG_WARNING ("Invalid coin signature on /deposit request!\n");
-    TALER_LOG_DEBUG ("... amount_with_fee was %s\n",
-                     TALER_amount2s (&cdd->amount));
-    TALER_LOG_DEBUG ("... deposit_fee was %s\n",
-                     TALER_amount2s (&dki->fees.deposit));
-    return GNUNET_SYSERR;
-  }
-
-  /* check coin signature */
-  {
-    struct TALER_CoinPublicInfo coin_info = {
-      .coin_pub = cdd->coin_pub,
-      .denom_pub_hash = cdd->h_denom_pub,
-      .denom_sig = cdd->denom_sig,
-      .h_age_commitment = cdd->h_age_commitment,
-    };
-
-    if (GNUNET_YES !=
-        TALER_test_coin_valid (&coin_info,
-                               &dki->key))
-    {
-      GNUNET_break_op (0);
-      TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
-      return GNUNET_SYSERR;
-    }
-  }
-
-  /* Check coin does make a contribution */
-  if (0 < TALER_amount_cmp (&dki->fees.deposit,
-                            &cdd->amount))
-  {
-    GNUNET_break_op (0);
-    TALER_LOG_WARNING ("Deposit amount smaller than fee\n");
-    return GNUNET_SYSERR;
-  }
-  return GNUNET_OK;
-}
-
-
 struct TALER_EXCHANGE_DepositHandle *
 TALER_EXCHANGE_deposit (
   struct TALER_EXCHANGE_Handle *exchange,
@@ -526,7 +455,7 @@ TALER_EXCHANGE_deposit (
                                       &dcd->wire_salt,
                                       &dh->h_wire);
   if (GNUNET_OK !=
-      verify_signatures (dcd,
+      TALER_EXCHANGE_verify_deposit_signature_ (dcd,
                                                 &dh->h_extensions,
                                                 &dh->h_wire,
                                                 cdd,

src/lib/exchange_api_handle.c

@@ -992,7 +992,7 @@ decode_keys_json (const json_t *resp_obj,
                                                  check_sig,
                                                  denom_key_obj,
                                                  &key_data->master_pub,
-                                                 check_sig ? &hash_xor: NULL));
+                                                 check_sig ? &hash_xor : NULL));
 
           // Build the running xor of the SHA512-hash of the public keys
           {