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authorChristian Grothoff <christian@grothoff.org>2020-02-29 16:42:10 +0100
committerChristian Grothoff <christian@grothoff.org>2020-02-29 16:42:10 +0100
commit0a2b049864c8dae0c53c203d46fca89e0e66849d (patch)
tree3e836be37902320a4a3a099ee62d960198057952 /src/lib/exchange_api_deposits_get.c
parentde9ab28ab9e55597baf2ca32194ec65b441f0f36 (diff)
downloadexchange-0a2b049864c8dae0c53c203d46fca89e0e66849d.tar.gz
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big rename fest related to #6067 API renaming
Diffstat (limited to 'src/lib/exchange_api_deposits_get.c')
-rw-r--r--src/lib/exchange_api_deposits_get.c400
1 files changed, 400 insertions, 0 deletions
diff --git a/src/lib/exchange_api_deposits_get.c b/src/lib/exchange_api_deposits_get.c
new file mode 100644
index 00000000..1ffd738c
--- /dev/null
+++ b/src/lib/exchange_api_deposits_get.c
@@ -0,0 +1,400 @@
+/*
+ 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/exchange_api_deposits_get.c
+ * @brief Implementation of the /deposits/ GET request
+ * @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_DepositGetHandle
+{
+
+ /**
+ * 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_DepositGetCallback 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_DepositGetHandle *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_DepositGetHandle`
+ * @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_DepositGetHandle *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_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:
+ /* 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_deposits_get_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_DepositGetHandle *
+TALER_EXCHANGE_deposits_get (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_DepositGetCallback cb,
+ void *cb_cls)
+{
+ struct TALER_DepositTrackPS dtp;
+ struct TALER_MerchantSignatureP merchant_sig;
+ struct TALER_EXCHANGE_DepositGetHandle *dwh;
+ struct GNUNET_CURL_Context *ctx;
+ CURL *eh;
+ char arg_str[(sizeof (struct TALER_CoinSpendPublicKeyP)
+ + sizeof (struct GNUNET_HashCode)
+ + sizeof (struct TALER_MerchantPublicKeyP)
+ + sizeof (struct GNUNET_HashCode)
+ + sizeof (struct TALER_MerchantSignatureP)) * 2 + 48];
+
+ 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));
+ {
+ char cpub_str[sizeof (struct TALER_CoinSpendPublicKeyP) * 2];
+ char mpub_str[sizeof (struct TALER_MerchantPublicKeyP) * 2];
+ char msig_str[sizeof (struct TALER_MerchantSignatureP) * 2];
+ char chash_str[sizeof (struct GNUNET_HashCode) * 2];
+ char whash_str[sizeof (struct GNUNET_HashCode) * 2];
+ char *end;
+
+ end = GNUNET_STRINGS_data_to_string (h_wire,
+ sizeof (struct
+ GNUNET_HashCode),
+ whash_str,
+ sizeof (whash_str));
+ *end = '\0';
+ end = GNUNET_STRINGS_data_to_string (&dtp.merchant,
+ sizeof (struct
+ TALER_MerchantPublicKeyP),
+ mpub_str,
+ sizeof (mpub_str));
+ *end = '\0';
+ end = GNUNET_STRINGS_data_to_string (h_contract_terms,
+ sizeof (struct
+ GNUNET_HashCode),
+ chash_str,
+ sizeof (chash_str));
+ *end = '\0';
+ end = GNUNET_STRINGS_data_to_string (coin_pub,
+ sizeof (struct
+ TALER_CoinSpendPublicKeyP),
+ cpub_str,
+ sizeof (cpub_str));
+ *end = '\0';
+ end = GNUNET_STRINGS_data_to_string (&merchant_sig,
+ sizeof (struct
+ TALER_MerchantSignatureP),
+ msig_str,
+ sizeof (msig_str));
+ *end = '\0';
+
+ GNUNET_snprintf (arg_str,
+ sizeof (arg_str),
+ "/deposits/%s/%s/%s/%s?merchant_sig=%s",
+ whash_str,
+ mpub_str,
+ chash_str,
+ cpub_str,
+ msig_str);
+ }
+
+ dwh = GNUNET_new (struct TALER_EXCHANGE_DepositGetHandle);
+ dwh->exchange = exchange;
+ dwh->cb = cb;
+ dwh->cb_cls = cb_cls;
+ dwh->url = TEAH_path_to_url (exchange,
+ arg_str);
+ 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);
+ ctx = TEAH_handle_to_context (exchange);
+ dwh->job = GNUNET_CURL_job_add (ctx,
+ eh,
+ GNUNET_NO,
+ &handle_deposit_wtid_finished,
+ dwh);
+ return dwh;
+}
+
+
+/**
+ * Cancel /deposits/$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_deposits_get_cancel (struct TALER_EXCHANGE_DepositGetHandle *dwh)
+{
+ if (NULL != dwh->job)
+ {
+ GNUNET_CURL_job_cancel (dwh->job);
+ dwh->job = NULL;
+ }
+ GNUNET_free (dwh->url);
+ TALER_curl_easy_post_finished (&dwh->ctx);
+ GNUNET_free (dwh);
+}
+
+
+/* end of exchange_api_deposits_get.c */