aboutsummaryrefslogtreecommitdiff
path: root/src/exchange-lib/exchange_api_deposit_wtid.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/exchange-lib/exchange_api_deposit_wtid.c')
-rw-r--r--src/exchange-lib/exchange_api_deposit_wtid.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/src/exchange-lib/exchange_api_deposit_wtid.c b/src/exchange-lib/exchange_api_deposit_wtid.c
new file mode 100644
index 000000000..83beb03ae
--- /dev/null
+++ b/src/exchange-lib/exchange_api_deposit_wtid.c
@@ -0,0 +1,379 @@
+/*
+ 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, If not, see
+ <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file exchange-lib/exchange_api_deposit_wtid.c
+ * @brief Implementation of the /deposit/wtid request of the exchange's HTTP API
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <curl/curl.h>
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include "taler_exchange_service.h"
+#include "exchange_api_common.h"
+#include "exchange_api_json.h"
+#include "exchange_api_context.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+
+
+/**
+ * @brief A Deposit Wtid Handle
+ */
+struct TALER_EXCHANGE_DepositWtidHandle
+{
+
+ /**
+ * 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 MAC_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_DepositWtidCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Download buffer
+ */
+ struct MAC_DownloadBuffer db;
+
+ /**
+ * 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
+ * @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
+ */
+static int
+verify_deposit_wtid_signature_ok (const struct TALER_EXCHANGE_DepositWtidHandle *dwh,
+ json_t *json)
+{
+ struct TALER_ExchangeSignatureP exchange_sig;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ const struct TALER_EXCHANGE_Keys *key_state;
+ struct MAJ_Specification spec[] = {
+ MAJ_spec_fixed_auto ("exchange_sig", &exchange_sig),
+ MAJ_spec_fixed_auto ("exchange_pub", &exchange_pub),
+ MAJ_spec_end
+ };
+
+ if (GNUNET_OK !=
+ MAJ_parse_json (json,
+ spec))
+ {
+ 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 /deposit/wtid request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_DepositWtidHandle`
+ * @param eh the curl request handle
+ */
+static void
+handle_deposit_wtid_finished (void *cls,
+ CURL *eh)
+{
+ struct TALER_EXCHANGE_DepositWtidHandle *dwh = cls;
+ long response_code;
+ json_t *json;
+ 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;
+
+ dwh->job = NULL;
+ json = MAC_download_get_result (&dwh->db,
+ eh,
+ &response_code);
+ switch (response_code)
+ {
+ case 0:
+ break;
+ case MHD_HTTP_OK:
+ {
+ struct MAJ_Specification spec[] = {
+ MAJ_spec_fixed_auto ("wtid", &dwh->depconf.wtid),
+ MAJ_spec_absolute_time ("execution_time", &execution_time),
+ MAJ_spec_amount ("coin_contribution", &coin_contribution_s),
+ MAJ_spec_end
+ };
+
+ if (GNUNET_OK !=
+ MAJ_parse_json (json,
+ spec))
+ {
+ 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,
+ json))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ }
+ }
+ break;
+ case MHD_HTTP_ACCEPTED:
+ {
+ /* Transaction known, but not executed yet */
+ struct MAJ_Specification spec[] = {
+ MAJ_spec_absolute_time ("execution_time", &execution_time),
+ MAJ_spec_end
+ };
+
+ if (GNUNET_OK !=
+ MAJ_parse_json (json,
+ spec))
+ {
+ 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",
+ response_code);
+ GNUNET_break (0);
+ response_code = 0;
+ break;
+ }
+ dwh->cb (dwh->cb_cls,
+ response_code,
+ json,
+ wtid,
+ execution_time,
+ coin_contribution);
+ json_decref (json);
+ TALER_EXCHANGE_deposit_wtid_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 hash of the contract
+ * @param coin_pub public key of the coin
+ * @param transaction_id transaction identifier
+ * @param cb function to call with the result
+ * @param cb_cls closure for @a cb
+ * @return handle to abort request
+ */
+struct TALER_EXCHANGE_DepositWtidHandle *
+TALER_EXCHANGE_deposit_wtid (struct TALER_EXCHANGE_Handle *exchange,
+ const struct TALER_MerchantPrivateKeyP *merchant_priv,
+ const struct GNUNET_HashCode *h_wire,
+ const struct GNUNET_HashCode *h_contract,
+ const struct TALER_CoinSpendPublicKeyP *coin_pub,
+ uint64_t transaction_id,
+ TALER_EXCHANGE_DepositWtidCallback cb,
+ void *cb_cls)
+{
+ struct TALER_DepositTrackPS dtp;
+ struct TALER_MerchantSignatureP merchant_sig;
+ struct TALER_EXCHANGE_DepositWtidHandle *dwh;
+ struct TALER_EXCHANGE_Context *ctx;
+ json_t *deposit_wtid_obj;
+ CURL *eh;
+
+ if (GNUNET_YES !=
+ MAH_handle_is_ready (exchange))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ dtp.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_DEPOSIT_WTID);
+ dtp.purpose.size = htonl (sizeof (dtp));
+ dtp.h_contract = *h_contract;
+ dtp.h_wire = *h_wire;
+ dtp.transaction_id = GNUNET_htonll (transaction_id);
+ 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 */
+ " s:o, s:I," /* coin_pub, transaction_id */
+ " s:o, s:o}", /* merchant_pub, merchant_sig */
+ "H_wire", TALER_json_from_data (h_wire,
+ sizeof (struct GNUNET_HashCode)),
+ "H_contract", TALER_json_from_data (h_contract,
+ sizeof (struct GNUNET_HashCode)),
+ "coin_pub", TALER_json_from_data (coin_pub,
+ sizeof (*coin_pub)),
+ "transaction_id", (json_int_t) transaction_id,
+ "merchant_pub", TALER_json_from_data (&dtp.merchant,
+ sizeof (struct TALER_MerchantPublicKeyP)),
+ "merchant_sig", TALER_json_from_data (&merchant_sig,
+ sizeof (merchant_sig)));
+
+ dwh = GNUNET_new (struct TALER_EXCHANGE_DepositWtidHandle);
+ dwh->exchange = exchange;
+ dwh->cb = cb;
+ dwh->cb_cls = cb_cls;
+ dwh->url = MAH_path_to_url (exchange, "/deposit/wtid");
+ dwh->depconf.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS));
+ dwh->depconf.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE);
+ dwh->depconf.h_wire = *h_wire;
+ dwh->depconf.h_contract = *h_contract;
+ dwh->depconf.coin_pub = *coin_pub;
+ dwh->depconf.transaction_id = GNUNET_htonll (transaction_id);
+
+ eh = curl_easy_init ();
+ 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_URL,
+ dwh->url));
+ 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)));
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_WRITEFUNCTION,
+ &MAC_download_cb));
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_WRITEDATA,
+ &dwh->db));
+ ctx = MAH_handle_to_context (exchange);
+ dwh->job = MAC_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_deposit_wtid_cancel (struct TALER_EXCHANGE_DepositWtidHandle *dwh)
+{
+ if (NULL != dwh->job)
+ {
+ MAC_job_cancel (dwh->job);
+ dwh->job = NULL;
+ }
+ GNUNET_free_non_null (dwh->db.buf);
+ GNUNET_free (dwh->url);
+ GNUNET_free (dwh->json_enc);
+ GNUNET_free (dwh);
+}
+
+
+/* end of exchange_api_deposit_wtid.c */