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authorChristian Grothoff <christian@grothoff.org>2019-01-11 21:27:34 +0100
committerChristian Grothoff <christian@grothoff.org>2019-01-11 21:43:15 +0100
commit54fc83ee6b910d482948c6ec8185df7aab1b0cb1 (patch)
tree10c04cad1392659a9ccef469271f866e393ebb48 /src/lib/exchange_api_track_transaction.c
parent57ab9f9fdba607fcc3817adf58f37c5390f8d220 (diff)
downloadexchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.tar.gz
exchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.tar.bz2
exchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.zip
fix cyclic dependency by combining exchange-lib and auditor-lib directories
Diffstat (limited to 'src/lib/exchange_api_track_transaction.c')
-rw-r--r--src/lib/exchange_api_track_transaction.c367
1 files changed, 367 insertions, 0 deletions
diff --git a/src/lib/exchange_api_track_transaction.c b/src/lib/exchange_api_track_transaction.c
new file mode 100644
index 00000000..0942ce84
--- /dev/null
+++ b/src/lib/exchange_api_track_transaction.c
@@ -0,0 +1,367 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014, 2015, 2016 GNUnet e.V.
+
+ 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 exchange-lib/exchange_api_track_transaction.c
+ * @brief Implementation of the /track/transaction 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 Deposit Wtid Handle
+ */
+struct TALER_EXCHANGE_TrackTransactionHandle
+{
+
+ /**
+ * The connection to exchange this request handle will use
+ */
+ struct TALER_EXCHANGE_Handle *exchange;
+
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * JSON encoding of the request to POST.
+ */
+ char *json_enc;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_TrackTransactionCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Information the exchange should sign in response.
+ * (with pre-filled fields from the request).
+ */
+ struct TALER_ConfirmWirePS depconf;
+
+};
+
+
+/**
+ * Verify that the signature on the "200 OK" response
+ * from the exchange is valid.
+ *
+ * @param dwh deposit wtid handle
+ * @param json json reply with the signature
+ * @param[out] exchange_pub set to the exchange's public key
+ * @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
+ */
+static int
+verify_deposit_wtid_signature_ok (const struct TALER_EXCHANGE_TrackTransactionHandle *dwh,
+ const json_t *json,
+ struct TALER_ExchangePublicKeyP *exchange_pub)
+{
+ struct TALER_ExchangeSignatureP exchange_sig;
+ const struct TALER_EXCHANGE_Keys *key_state;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
+ GNUNET_JSON_spec_fixed_auto ("exchange_pub", exchange_pub),
+ GNUNET_JSON_spec_end()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (json,
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ key_state = TALER_EXCHANGE_get_keys (dwh->exchange);
+ if (GNUNET_OK !=
+ TALER_EXCHANGE_test_signing_key (key_state,
+ exchange_pub))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE,
+ &dwh->depconf.purpose,
+ &exchange_sig.eddsa_signature,
+ &exchange_pub->eddsa_pub))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /track/transaction request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_TrackTransactionHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_deposit_wtid_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_EXCHANGE_TrackTransactionHandle *dwh = cls;
+ const struct TALER_WireTransferIdentifierRawP *wtid = NULL;
+ struct GNUNET_TIME_Absolute execution_time = GNUNET_TIME_UNIT_FOREVER_ABS;
+ const struct TALER_Amount *coin_contribution = NULL;
+ struct TALER_Amount coin_contribution_s;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ struct TALER_ExchangePublicKeyP *ep = NULL;
+ const json_t *j = response;
+
+ dwh->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ break;
+ case MHD_HTTP_OK:
+ {
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto ("wtid", &dwh->depconf.wtid),
+ GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
+ TALER_JSON_spec_amount ("coin_contribution", &coin_contribution_s),
+ GNUNET_JSON_spec_end()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ break;
+ }
+ wtid = &dwh->depconf.wtid;
+ dwh->depconf.execution_time = GNUNET_TIME_absolute_hton (execution_time);
+ TALER_amount_hton (&dwh->depconf.coin_contribution,
+ &coin_contribution_s);
+ coin_contribution = &coin_contribution_s;
+ if (GNUNET_OK !=
+ verify_deposit_wtid_signature_ok (dwh,
+ j,
+ &exchange_pub))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ }
+ else
+ {
+ ep = &exchange_pub;
+ }
+ }
+ break;
+ case MHD_HTTP_ACCEPTED:
+ {
+ /* Transaction known, but not executed yet */
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
+ GNUNET_JSON_spec_end()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ break;
+ }
+ }
+ 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 */
+ break;
+ case MHD_HTTP_UNAUTHORIZED:
+ /* 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:
+ /* Exchange does not know about transaction;
+ we should pass the reply to the application */
+ 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;
+ }
+ dwh->cb (dwh->cb_cls,
+ response_code,
+ TALER_JSON_get_error_code (j),
+ ep,
+ j,
+ wtid,
+ execution_time,
+ coin_contribution);
+ TALER_EXCHANGE_track_transaction_cancel (dwh);
+}
+
+
+/**
+ * Obtain wire transfer details about an existing deposit operation.
+ *
+ * @param exchange the exchange to query
+ * @param merchant_priv the merchant's private key
+ * @param h_wire hash of merchant's wire transfer details
+ * @param h_contract_terms hash of the proposal data from the contract
+ * between merchant and customer
+ * @param coin_pub public key of the coin
+ * @param cb function to call with the result
+ * @param cb_cls closure for @a cb
+ * @return handle to abort request
+ */
+struct TALER_EXCHANGE_TrackTransactionHandle *
+TALER_EXCHANGE_track_transaction (struct TALER_EXCHANGE_Handle *exchange,
+ const struct TALER_MerchantPrivateKeyP *merchant_priv,
+ const struct GNUNET_HashCode *h_wire,
+ const struct GNUNET_HashCode *h_contract_terms,
+ const struct TALER_CoinSpendPublicKeyP *coin_pub,
+ TALER_EXCHANGE_TrackTransactionCallback cb,
+ void *cb_cls)
+{
+ struct TALER_DepositTrackPS dtp;
+ struct TALER_MerchantSignatureP merchant_sig;
+ struct TALER_EXCHANGE_TrackTransactionHandle *dwh;
+ struct GNUNET_CURL_Context *ctx;
+ json_t *deposit_wtid_obj;
+ CURL *eh;
+
+ if (GNUNET_YES !=
+ TEAH_handle_is_ready (exchange))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ dtp.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION);
+ dtp.purpose.size = htonl (sizeof (dtp));
+ dtp.h_contract_terms = *h_contract_terms;
+ dtp.h_wire = *h_wire;
+ GNUNET_CRYPTO_eddsa_key_get_public (&merchant_priv->eddsa_priv,
+ &dtp.merchant.eddsa_pub);
+
+ dtp.coin_pub = *coin_pub;
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_eddsa_sign (&merchant_priv->eddsa_priv,
+ &dtp.purpose,
+ &merchant_sig.eddsa_sig));
+ deposit_wtid_obj = json_pack ("{s:o, s:o," /* H_wire, h_contract_terms */
+ " s:o," /* coin_pub */
+ " s:o, s:o}", /* merchant_pub, merchant_sig */
+ "H_wire", GNUNET_JSON_from_data_auto (h_wire),
+ "h_contract_terms", GNUNET_JSON_from_data_auto (h_contract_terms),
+ "coin_pub", GNUNET_JSON_from_data_auto (coin_pub),
+ "merchant_pub", GNUNET_JSON_from_data_auto (&dtp.merchant),
+ "merchant_sig", GNUNET_JSON_from_data_auto (&merchant_sig));
+ if (NULL == deposit_wtid_obj)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+
+ dwh = GNUNET_new (struct TALER_EXCHANGE_TrackTransactionHandle);
+ dwh->exchange = exchange;
+ dwh->cb = cb;
+ dwh->cb_cls = cb_cls;
+ dwh->url = TEAH_path_to_url (exchange, "/track/transaction");
+ dwh->depconf.purpose.size = htonl (sizeof (struct TALER_ConfirmWirePS));
+ dwh->depconf.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE);
+ dwh->depconf.h_wire = *h_wire;
+ dwh->depconf.h_contract_terms = *h_contract_terms;
+ dwh->depconf.coin_pub = *coin_pub;
+
+ eh = TEL_curl_easy_get (dwh->url);
+ GNUNET_assert (NULL != (dwh->json_enc =
+ json_dumps (deposit_wtid_obj,
+ JSON_COMPACT)));
+ json_decref (deposit_wtid_obj);
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_POSTFIELDS,
+ dwh->json_enc));
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_POSTFIELDSIZE,
+ strlen (dwh->json_enc)));
+ ctx = TEAH_handle_to_context (exchange);
+ dwh->job = GNUNET_CURL_job_add (ctx,
+ eh,
+ GNUNET_YES,
+ &handle_deposit_wtid_finished,
+ dwh);
+ return dwh;
+}
+
+
+/**
+ * Cancel deposit wtid request. This function cannot be used on a request
+ * handle if a response is already served for it.
+ *
+ * @param dwh the wire deposits request handle
+ */
+void
+TALER_EXCHANGE_track_transaction_cancel (struct TALER_EXCHANGE_TrackTransactionHandle *dwh)
+{
+ if (NULL != dwh->job)
+ {
+ GNUNET_CURL_job_cancel (dwh->job);
+ dwh->job = NULL;
+ }
+ GNUNET_free (dwh->url);
+ GNUNET_free (dwh->json_enc);
+ GNUNET_free (dwh);
+}
+
+
+/* end of exchange_api_deposit_wtid.c */