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-rw-r--r--src/lib/exchange_api_batch_deposit.c647
1 files changed, 647 insertions, 0 deletions
diff --git a/src/lib/exchange_api_batch_deposit.c b/src/lib/exchange_api_batch_deposit.c
new file mode 100644
index 000000000..be77f682b
--- /dev/null
+++ b/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 */