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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_transfers_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_transfers_get.c')
-rw-r--r--src/lib/exchange_api_transfers_get.c400
1 files changed, 400 insertions, 0 deletions
diff --git a/src/lib/exchange_api_transfers_get.c b/src/lib/exchange_api_transfers_get.c
new file mode 100644
index 00000000..8ea8918c
--- /dev/null
+++ b/src/lib/exchange_api_transfers_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_transfers_get.c
+ * @brief Implementation of the GET /transfers/ 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_curl_lib.h>
+#include "taler_exchange_service.h"
+#include "taler_json_lib.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * @brief A /transfers/ GET Handle
+ */
+struct TALER_EXCHANGE_TransfersGetHandle
+{
+
+ /**
+ * 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 GNUNET_CURL_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_TransfersGetCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * We got a #MHD_HTTP_OK response for the /transfers/ request.
+ * Check that the response is well-formed and if it is, call the
+ * callback. If not, return an error code.
+ *
+ * This code is very similar to
+ * merchant_api_track_transfer.c::check_transfers_get_response_ok.
+ * Any changes should likely be reflected there as well.
+ *
+ * @param wdh handle to the operation
+ * @param json response we got
+ * @return #GNUNET_OK if we are done and all is well,
+ * #GNUNET_SYSERR if the response was bogus
+ */
+static int
+check_transfers_get_response_ok (struct
+ TALER_EXCHANGE_TransfersGetHandle *wdh,
+ const json_t *json)
+{
+ json_t *details_j;
+ struct GNUNET_HashCode h_wire;
+ struct GNUNET_TIME_Absolute exec_time;
+ struct TALER_Amount total_amount;
+ struct TALER_Amount total_expected;
+ struct TALER_Amount wire_fee;
+ struct TALER_MerchantPublicKeyP merchant_pub;
+ unsigned int num_details;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ struct TALER_ExchangeSignatureP exchange_sig;
+ struct GNUNET_JSON_Specification spec[] = {
+ TALER_JSON_spec_amount ("total", &total_amount),
+ TALER_JSON_spec_amount ("wire_fee", &wire_fee),
+ GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub),
+ GNUNET_JSON_spec_fixed_auto ("h_wire", &h_wire),
+ GNUNET_JSON_spec_absolute_time ("execution_time", &exec_time),
+ GNUNET_JSON_spec_json ("deposits", &details_j),
+ 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;
+ }
+ if (GNUNET_OK !=
+ TALER_amount_get_zero (total_amount.currency,
+ &total_expected))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ num_details = json_array_size (details_j);
+ {
+ struct TALER_TrackTransferDetails 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_TrackTransferDetails *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_terms",
+ &detail->h_contract_terms),
+ GNUNET_JSON_spec_fixed_auto ("coin_pub", &detail->coin_pub),
+ TALER_JSON_spec_amount ("deposit_value", &detail->coin_value),
+ TALER_JSON_spec_amount ("deposit_fee", &detail->coin_fee),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (detail_j,
+ spec_detail,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ GNUNET_CRYPTO_hash_context_abort (hash_context);
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_SYSERR;
+ }
+ /* build up big hash for signature checking later */
+ dd.h_contract_terms = detail->h_contract_terms;
+ dd.execution_time = GNUNET_TIME_absolute_hton (exec_time);
+ dd.coin_pub = detail->coin_pub;
+ TALER_amount_hton (&dd.deposit_value,
+ &detail->coin_value);
+ TALER_amount_hton (&dd.deposit_fee,
+ &detail->coin_fee);
+ if ( (GNUNET_OK !=
+ TALER_amount_add (&total_expected,
+ &total_expected,
+ &detail->coin_value)) ||
+ (GNUNET_OK !=
+ TALER_amount_subtract (&total_expected,
+ &total_expected,
+ &detail->coin_fee)) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_CRYPTO_hash_context_abort (hash_context);
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_SYSERR;
+ }
+ 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);
+ TALER_amount_hton (&wdp.wire_fee,
+ &wire_fee);
+ wdp.merchant_pub = merchant_pub;
+ wdp.h_wire = h_wire;
+ GNUNET_CRYPTO_hash_context_finish (hash_context,
+ &wdp.h_details);
+ if (GNUNET_OK !=
+ TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys (
+ wdh->exchange),
+ &exchange_pub))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK != GNUNET_CRYPTO_eddsa_verify
+ (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT,
+ &wdp.purpose,
+ &exchange_sig.eddsa_signature,
+ &exchange_pub.eddsa_pub))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_SYSERR;
+ }
+
+ if (GNUNET_OK !=
+ TALER_amount_subtract (&total_expected,
+ &total_expected,
+ &wire_fee))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_SYSERR;
+ }
+ if (0 !=
+ TALER_amount_cmp (&total_expected,
+ &total_amount))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_SYSERR;
+ }
+ wdh->cb (wdh->cb_cls,
+ MHD_HTTP_OK,
+ TALER_EC_NONE,
+ &exchange_pub,
+ json,
+ &h_wire,
+ exec_time,
+ &total_amount,
+ &wire_fee,
+ num_details,
+ details);
+ }
+ GNUNET_JSON_parse_free (spec);
+ TALER_EXCHANGE_transfers_get_cancel (wdh);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /transfers/ request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_TransfersGetHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_transfers_get_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_EXCHANGE_TransfersGetHandle *wdh = cls;
+ const json_t *j = response;
+
+ wdh->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ break;
+ case MHD_HTTP_OK:
+ if (GNUNET_OK ==
+ check_transfers_get_response_ok (wdh,
+ j))
+ return;
+ GNUNET_break_op (0);
+ response_code = 0;
+ 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;
+ }
+ wdh->cb (wdh->cb_cls,
+ response_code,
+ TALER_JSON_get_error_code (j),
+ NULL,
+ j,
+ NULL,
+ GNUNET_TIME_UNIT_ZERO_ABS,
+ NULL,
+ NULL,
+ 0, NULL);
+ TALER_EXCHANGE_transfers_get_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_TransfersGetHandle *
+TALER_EXCHANGE_transfers_get (struct TALER_EXCHANGE_Handle *exchange,
+ const struct
+ TALER_WireTransferIdentifierRawP *wtid,
+ TALER_EXCHANGE_TransfersGetCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_TransfersGetHandle *wdh;
+ struct GNUNET_CURL_Context *ctx;
+ CURL *eh;
+ char arg_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2 + 32];
+
+ if (GNUNET_YES !=
+ TEAH_handle_is_ready (exchange))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+
+ wdh = GNUNET_new (struct TALER_EXCHANGE_TransfersGetHandle);
+ wdh->exchange = exchange;
+ wdh->cb = cb;
+ wdh->cb_cls = cb_cls;
+
+ {
+ char wtid_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2];
+ char *end;
+
+ end = GNUNET_STRINGS_data_to_string (wtid,
+ sizeof (struct
+ TALER_WireTransferIdentifierRawP),
+ wtid_str,
+ sizeof (wtid_str));
+ *end = '\0';
+ GNUNET_snprintf (arg_str,
+ sizeof (arg_str),
+ "/transfers/%s",
+ wtid_str);
+ }
+ wdh->url = TEAH_path_to_url (wdh->exchange,
+ arg_str);
+ eh = TEL_curl_easy_get (wdh->url);
+ ctx = TEAH_handle_to_context (exchange);
+ wdh->job = GNUNET_CURL_job_add (ctx,
+ eh,
+ GNUNET_YES,
+ &handle_transfers_get_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_transfers_get_cancel (struct
+ TALER_EXCHANGE_TransfersGetHandle *wdh)
+{
+ if (NULL != wdh->job)
+ {
+ GNUNET_CURL_job_cancel (wdh->job);
+ wdh->job = NULL;
+ }
+ GNUNET_free (wdh->url);
+ GNUNET_free (wdh);
+}
+
+
+/* end of exchange_api_wire_deposits.c */