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-rw-r--r--src/exchange-lib/exchange_api_wire_deposits.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/src/exchange-lib/exchange_api_wire_deposits.c b/src/exchange-lib/exchange_api_wire_deposits.c
new file mode 100644
index 000000000..49a50f640
--- /dev/null
+++ b/src/exchange-lib/exchange_api_wire_deposits.c
@@ -0,0 +1,330 @@
+/*
+ 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_wire_deposits.c
+ * @brief Implementation of the /wire/deposits 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 "taler_json_lib.h"
+#include "exchange_api_context.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+
+
+/**
+ * @brief A /wire/deposits Handle
+ */
+struct TALER_EXCHANGE_WireDepositsHandle
+{
+
+ /**
+ * The connection to exchange this request handle will use
+ */
+ struct TALER_EXCHANGE_Handle *exchange;
+
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * Handle for the request.
+ */
+ struct MAC_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_WireDepositsCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Download buffer
+ */
+ struct MAC_DownloadBuffer db;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /wire/deposits request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_WireDepositsHandle`
+ * @param eh the curl request handle
+ */
+static void
+handle_wire_deposits_finished (void *cls,
+ CURL *eh)
+{
+ struct TALER_EXCHANGE_WireDepositsHandle *wdh = cls;
+ long response_code;
+ json_t *json;
+
+ wdh->job = NULL;
+ json = MAC_download_get_result (&wdh->db,
+ eh,
+ &response_code);
+ switch (response_code)
+ {
+ case 0:
+ break;
+ case MHD_HTTP_OK:
+ {
+ json_t *details_j;
+ struct GNUNET_HashCode h_wire;
+ struct TALER_Amount total_amount;
+ struct TALER_MerchantPublicKeyP merchant_pub;
+ unsigned int num_details;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ struct TALER_ExchangeSignatureP exchange_sig;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto ("H_wire", &h_wire),
+ GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub),
+ GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
+ GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub),
+ TALER_JSON_spec_amount ("total_amount", &total_amount),
+ GNUNET_JSON_spec_json ("details", &details_j),
+ GNUNET_JSON_spec_end()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (json,
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ break;
+ }
+ num_details = json_array_size (details_j);
+ {
+ struct TALER_WireDepositDetails details[num_details];
+ unsigned int i;
+ struct GNUNET_HashContext *hash_context;
+ struct TALER_WireDepositDetailP dd;
+ struct TALER_WireDepositDataPS wdp;
+
+ hash_context = GNUNET_CRYPTO_hash_context_start ();
+ for (i=0;i<num_details;i++)
+ {
+ struct TALER_WireDepositDetails *detail = &details[i];
+ struct json_t *detail_j = json_array_get (details_j, i);
+ struct GNUNET_JSON_Specification spec_detail[] = {
+ GNUNET_JSON_spec_fixed_auto ("H_contract", &detail->h_contract),
+ TALER_JSON_spec_amount ("deposit_value", &detail->coin_value),
+ TALER_JSON_spec_amount ("deposit_fee", &detail->coin_fee),
+ GNUNET_JSON_spec_uint64 ("transaction_id", &detail->transaction_id),
+ GNUNET_JSON_spec_fixed_auto ("coin_pub", &detail->coin_pub),
+ GNUNET_JSON_spec_end()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (detail_j,
+ spec_detail,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ break;
+ }
+ /* build up big hash for signature checking later */
+ dd.h_contract = detail->h_contract;
+ dd.transaction_id = GNUNET_htonll (detail->transaction_id);
+ dd.coin_pub = detail->coin_pub;
+ TALER_amount_hton (&dd.deposit_value,
+ &detail->coin_value);
+ TALER_amount_hton (&dd.deposit_fee,
+ &detail->coin_fee);
+ GNUNET_CRYPTO_hash_context_read (hash_context,
+ &dd,
+ sizeof (struct TALER_WireDepositDetailP));
+ }
+ /* Check signature */
+ wdp.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT);
+ wdp.purpose.size = htonl (sizeof (struct TALER_WireDepositDataPS));
+ TALER_amount_hton (&wdp.total,
+ &total_amount);
+ wdp.merchant_pub = merchant_pub;
+ wdp.h_wire = h_wire;
+ GNUNET_CRYPTO_hash_context_finish (hash_context,
+ &wdp.h_details);
+ if ( (0 == response_code /* avoid crypto if things are already wrong */) &&
+ (GNUNET_OK !=
+ TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys (wdh->exchange),
+ &exchange_pub)) )
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ }
+ if ( (0 == response_code /* avoid crypto if things are already wrong */) &&
+ (GNUNET_OK !=
+ TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys (wdh->exchange),
+ &exchange_pub)) )
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ }
+ if (0 == response_code)
+ break;
+ wdh->cb (wdh->cb_cls,
+ response_code,
+ json,
+ &h_wire,
+ &total_amount,
+ num_details,
+ details);
+ json_decref (json);
+ TALER_EXCHANGE_wire_deposits_cancel (wdh);
+ return;
+ }
+ }
+ 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;
+ }
+ wdh->cb (wdh->cb_cls,
+ response_code,
+ json,
+ NULL, NULL, 0, NULL);
+ json_decref (json);
+ TALER_EXCHANGE_wire_deposits_cancel (wdh);
+}
+
+
+/**
+ * Query the exchange about which transactions were combined
+ * to create a wire transfer.
+ *
+ * @param exchange exchange to query
+ * @param wtid raw wire transfer identifier to get information about
+ * @param cb callback to call
+ * @param cb_cls closure for @a cb
+ * @return handle to cancel operation
+ */
+struct TALER_EXCHANGE_WireDepositsHandle *
+TALER_EXCHANGE_wire_deposits (struct TALER_EXCHANGE_Handle *exchange,
+ const struct TALER_WireTransferIdentifierRawP *wtid,
+ TALER_EXCHANGE_WireDepositsCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_WireDepositsHandle *wdh;
+ struct TALER_EXCHANGE_Context *ctx;
+ char *buf;
+ char *path;
+ CURL *eh;
+
+ if (GNUNET_YES !=
+ MAH_handle_is_ready (exchange))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+
+ wdh = GNUNET_new (struct TALER_EXCHANGE_WireDepositsHandle);
+ wdh->exchange = exchange;
+ wdh->cb = cb;
+ wdh->cb_cls = cb_cls;
+
+ buf = GNUNET_STRINGS_data_to_string_alloc (wtid,
+ sizeof (struct TALER_WireTransferIdentifierRawP));
+ GNUNET_asprintf (&path,
+ "/wire/deposits?wtid=%s",
+ buf);
+ wdh->url = MAH_path_to_url (wdh->exchange,
+ path);
+ GNUNET_free (buf);
+ GNUNET_free (path);
+
+ eh = curl_easy_init ();
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_URL,
+ wdh->url));
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_WRITEFUNCTION,
+ &MAC_download_cb));
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_WRITEDATA,
+ &wdh->db));
+ ctx = MAH_handle_to_context (exchange);
+ wdh->job = MAC_job_add (ctx,
+ eh,
+ GNUNET_YES,
+ &handle_wire_deposits_finished,
+ wdh);
+ return wdh;
+}
+
+
+/**
+ * Cancel wire deposits request. This function cannot be used on a request
+ * handle if a response is already served for it.
+ *
+ * @param wdh the wire deposits request handle
+ */
+void
+TALER_EXCHANGE_wire_deposits_cancel (struct TALER_EXCHANGE_WireDepositsHandle *wdh)
+{
+ if (NULL != wdh->job)
+ {
+ MAC_job_cancel (wdh->job);
+ wdh->job = NULL;
+ }
+ GNUNET_free_non_null (wdh->db.buf);
+ GNUNET_free (wdh->url);
+ GNUNET_free (wdh);
+}
+
+
+/* end of exchange_api_wire_deposits.c */