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authorChristian Grothoff <christian@grothoff.org>2020-01-11 15:19:56 +0100
committerChristian Grothoff <christian@grothoff.org>2020-01-11 15:20:17 +0100
commit9443c10d7feb0d91323869dd08ec61ca781564f4 (patch)
treefd617ea56cc1d2ea370ce7e5467574a536b52d28 /src/bank-lib/bank_api_debit.c
parent554da10133eb491b352a106b98ebeaed797133bb (diff)
downloadexchange-9443c10d7feb0d91323869dd08ec61ca781564f4.tar.gz
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major refactoring, eliminating wire-plugins and moving towards new bank API. main code compiles, testcases known to fail, code sure not to fully work yet
Diffstat (limited to 'src/bank-lib/bank_api_debit.c')
-rw-r--r--src/bank-lib/bank_api_debit.c317
1 files changed, 317 insertions, 0 deletions
diff --git a/src/bank-lib/bank_api_debit.c b/src/bank-lib/bank_api_debit.c
new file mode 100644
index 00000000..84836243
--- /dev/null
+++ b/src/bank-lib/bank_api_debit.c
@@ -0,0 +1,317 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2017--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 bank-lib/bank_api_history.c
+ * @brief Implementation of the /history[-range]
+ * requests of the bank's HTTP API.
+ * @author Christian Grothoff
+ * @author Marcello Stanisci
+ */
+#include "platform.h"
+#include "bank_api_common.h"
+#include <microhttpd.h> /* just for HTTP status codes */
+#include "taler_signatures.h"
+
+
+/**
+ * @brief A /history Handle
+ */
+struct TALER_BANK_DebitHistoryHandle
+{
+
+ /**
+ * The url for this request.
+ */
+ char *request_url;
+
+ /**
+ * The base URL of the bank.
+ */
+ char *bank_base_url;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_BANK_DebitResultCallback hcb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *hcb_cls;
+};
+
+
+/**
+ * Parse history given in JSON format and invoke the callback on each item.
+ *
+ * @param hh handle to the account history request
+ * @param history JSON array with the history
+ * @return #GNUNET_OK if history was valid and @a rhistory and @a balance
+ * were set,
+ * #GNUNET_SYSERR if there was a protocol violation in @a history
+ */
+static int
+parse_account_history (struct TALER_BANK_DebitHistoryHandle *hh,
+ const json_t *history)
+{
+ json_t *history_array;
+
+ if (NULL == (history_array = json_object_get (history,
+ "data")))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (! json_is_array (history_array))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ for (unsigned int i = 0; i<json_array_size (history_array); i++)
+ {
+ struct TALER_BANK_DebitDetails td;
+ uint64_t row_id;
+ struct GNUNET_JSON_Specification hist_spec[] = {
+ TALER_JSON_spec_amount ("amount",
+ &td.amount),
+ GNUNET_JSON_spec_absolute_time ("date",
+ &td.execution_date),
+ GNUNET_JSON_spec_uint64 ("row_id",
+ &row_id),
+ GNUNET_JSON_spec_fixed_auto ("wtid",
+ &td.wtid),
+ GNUNET_JSON_spec_string ("counterpart",
+ &td.account_url),
+ GNUNET_JSON_spec_string ("exchange_base_url",
+ &td.exchange_base_url),
+ GNUNET_JSON_spec_end ()
+ };
+ json_t *transaction = json_array_get (history_array,
+ i);
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (transaction,
+ hist_spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ hh->hcb (hh->hcb_cls,
+ MHD_HTTP_OK,
+ TALER_EC_NONE,
+ row_id,
+ &td,
+ transaction);
+ GNUNET_JSON_parse_free (hist_spec);
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /history request.
+ *
+ * @param cls the `struct TALER_BANK_DebitHistoryHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_history_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_BANK_DebitHistoryHandle *hh = cls;
+ enum TALER_ErrorCode ec;
+ const json_t *j = response;
+
+ hh->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ ec = TALER_EC_INVALID_RESPONSE;
+ break;
+ case MHD_HTTP_OK:
+ if (GNUNET_OK !=
+ parse_account_history (hh,
+ j))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ ec = TALER_EC_INVALID_RESPONSE;
+ break;
+ }
+ response_code = MHD_HTTP_NO_CONTENT; /* signal end of list */
+ ec = TALER_EC_NONE;
+ break;
+ case MHD_HTTP_NO_CONTENT:
+ ec = TALER_EC_NONE;
+ break;
+ case MHD_HTTP_BAD_REQUEST:
+ /* This should never happen, either us or the bank is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ ec = TALER_BANK_parse_ec_ (j);
+ break;
+ case MHD_HTTP_FORBIDDEN:
+ /* Access denied */
+ ec = TALER_BANK_parse_ec_ (j);
+ break;
+ case MHD_HTTP_UNAUTHORIZED:
+ /* Nothing really to verify, bank says one of the signatures is
+ invalid; as we checked them, this should never happen, we
+ should pass the JSON reply to the application */
+ ec = TALER_BANK_parse_ec_ (j);
+ break;
+ case MHD_HTTP_NOT_FOUND:
+ /* Nothing really to verify, this should never
+ happen, we should pass the JSON reply to the application */
+ ec = TALER_BANK_parse_ec_ (j);
+ break;
+ case MHD_HTTP_INTERNAL_SERVER_ERROR:
+ /* Server had an internal issue; we should retry, but this API
+ leaves this to the application */
+ ec = TALER_BANK_parse_ec_ (j);
+ break;
+ default:
+ /* unexpected response code */
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Unexpected response code %u\n",
+ (unsigned int) response_code);
+ GNUNET_break (0);
+ ec = TALER_BANK_parse_ec_ (j);
+ response_code = 0;
+ break;
+ }
+ hh->hcb (hh->hcb_cls,
+ response_code,
+ ec,
+ 0LLU,
+ NULL,
+ j);
+ TALER_BANK_debit_history_cancel (hh);
+}
+
+
+/**
+ * Request the debit history of the exchange's bank account.
+ *
+ * @param ctx curl context for the event loop
+ * @param bank_base_url URL of the base INCLUDING account number
+ * @param auth authentication data to use
+ * @param start_row from which row on do we want to get results,
+ * use UINT64_MAX for the latest; exclusive
+ * @param num_results how many results do we want;
+ * negative numbers to go into the past, positive numbers
+ * to go into the future starting at @a start_row;
+ * must not be zero.
+ * @param hres_cb the callback to call with the transaction
+ * history
+ * @param hres_cb_cls closure for the above callback
+ * @return NULL if the inputs are invalid (i.e. zero value for
+ * @e num_results). In this case, the callback is not
+ * called.
+ */
+struct TALER_BANK_DebitHistoryHandle *
+TALER_BANK_debit_history (struct GNUNET_CURL_Context *ctx,
+ const char *bank_base_url,
+ const struct TALER_BANK_AuthenticationData *auth,
+ uint64_t start_row,
+ int64_t num_results,
+ TALER_BANK_DebitResultCallback hres_cb,
+ void *hres_cb_cls)
+{
+ char *url;
+ struct TALER_BANK_DebitHistoryHandle *hh;
+ CURL *eh;
+
+ if (0 == num_results)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+
+ if (UINT64_MAX == start_row)
+ GNUNET_asprintf (&url,
+ "/history&delta=%lld",
+ (long long) num_results);
+ else
+ GNUNET_asprintf (&url,
+ "/history&delta=%lld&start=%llu",
+ (long long) num_results,
+ start_row);
+ hh = GNUNET_new (struct TALER_BANK_DebitHistoryHandle);
+ hh->hcb = hres_cb;
+ hh->hcb_cls = hres_cb_cls;
+ hh->bank_base_url = GNUNET_strdup (bank_base_url);
+ hh->request_url = TALER_BANK_path_to_url_ (bank_base_url,
+ url);
+
+ eh = curl_easy_init ();
+ if ( (GNUNET_OK !=
+ TALER_BANK_setup_auth_ (eh,
+ auth)) ||
+ (CURLE_OK !=
+ curl_easy_setopt (eh,
+ CURLOPT_URL,
+ hh->request_url)) )
+ {
+ GNUNET_break (0);
+ TALER_BANK_debit_history_cancel (hh);
+ curl_easy_cleanup (eh);
+ GNUNET_free (url);
+ return NULL;
+ }
+ hh->job = GNUNET_CURL_job_add2 (ctx,
+ eh,
+ NULL,
+ &handle_history_finished,
+ hh);
+ GNUNET_free (url);
+ return hh;
+}
+
+
+/**
+ * Cancel a history request. This function cannot be
+ * used on a request handle if a response is already
+ * served for it.
+ *
+ * @param hh the history request handle
+ */
+void
+TALER_BANK_debit_history_cancel (struct TALER_BANK_DebitHistoryHandle *hh)
+{
+ if (NULL != hh->job)
+ {
+ GNUNET_CURL_job_cancel (hh->job);
+ hh->job = NULL;
+ }
+ GNUNET_free (hh->request_url);
+ GNUNET_free (hh->bank_base_url);
+ GNUNET_free (hh);
+}
+
+
+/* end of bank_api_debit.c */