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-rw-r--r--src/lib/exchange_api_purses_get.c244
1 files changed, 244 insertions, 0 deletions
diff --git a/src/lib/exchange_api_purses_get.c b/src/lib/exchange_api_purses_get.c
new file mode 100644
index 000000000..c32bc950b
--- /dev/null
+++ b/src/lib/exchange_api_purses_get.c
@@ -0,0 +1,244 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2022 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_purses_get.c
+ * @brief Implementation of the /purses/ 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 Contract Get Handle
+ */
+struct TALER_EXCHANGE_PursesGetHandle
+{
+
+ /**
+ * 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_PurseGetCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /purses/$PID GET request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_PursesGetHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_purse_get_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_EXCHANGE_PursesGetHandle *cgh = cls;
+ const json_t *j = response;
+ struct TALER_EXCHANGE_PurseGetResponse dr = {
+ .hr.reply = j,
+ .hr.http_status = (unsigned int) response_code
+ };
+
+ cgh->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+ break;
+ case MHD_HTTP_OK:
+ {
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_timestamp ("merge_timestamp",
+ &dr.details.success.merge_timestamp),
+ GNUNET_JSON_spec_timestamp ("deposit_timestamp",
+ &dr.details.success.deposit_timestamp),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ dr.hr.http_status = 0;
+ dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+ break;
+ }
+ cgh->cb (cgh->cb_cls,
+ &dr);
+ TALER_EXCHANGE_purse_get_cancel (cgh);
+ return;
+ }
+ case MHD_HTTP_BAD_REQUEST:
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ /* 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:
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ /* 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:
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ /* Exchange does not know about transaction;
+ we should pass the reply to the application */
+ break;
+ case MHD_HTTP_INTERNAL_SERVER_ERROR:
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ /* Server had an internal issue; we should retry, but this API
+ leaves this to the application */
+ break;
+ default:
+ /* unexpected response code */
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Unexpected response code %u/%d for exchange GET purses\n",
+ (unsigned int) response_code,
+ (int) dr.hr.ec);
+ GNUNET_break_op (0);
+ break;
+ }
+ cgh->cb (cgh->cb_cls,
+ &dr);
+ TALER_EXCHANGE_purse_get_cancel (cgh);
+}
+
+
+struct TALER_EXCHANGE_PursesGetHandle *
+TALER_EXCHANGE_purse_get (
+ struct TALER_EXCHANGE_Handle *exchange,
+ const struct TALER_PurseContractPrivateKeyP *purse_priv,
+ struct GNUNET_TIME_Relative merge_timeout,
+ struct GNUNET_TIME_Relative deposit_timeout,
+ TALER_EXCHANGE_PurseGetCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_PursesGetHandle *cgh;
+ CURL *eh;
+ struct TALER_PurseContractPublicKeyP purse_pub;
+ char arg_str[sizeof (purse_pub) * 2 + 48];
+
+ if (GNUNET_YES !=
+ TEAH_handle_is_ready (exchange))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ cgh = GNUNET_new (struct TALER_EXCHANGE_PursesGetHandle);
+ cgh->exchange = exchange;
+ cgh->cb = cb;
+ cgh->cb_cls = cb_cls;
+ GNUNET_CRYPTO_ecdhe_key_get_public (&purse_priv->ecdhe_priv,
+ &purse_pub.ecdhe_pub);
+ {
+ char cpub_str[sizeof (purse_pub) * 2];
+ char *end;
+
+ end = GNUNET_STRINGS_data_to_string (&purse_pub,
+ sizeof (purse_pub),
+ cpub_str,
+ sizeof (cpub_str));
+ *end = '\0';
+ GNUNET_snprintf (arg_str,
+ sizeof (arg_str),
+ "/purses/%s",
+ cpub_str);
+ }
+
+ cgh->url = TEAH_path_to_url (exchange,
+ arg_str);
+ if (NULL == cgh->url)
+ {
+ GNUNET_free (cgh);
+ return NULL;
+ }
+ eh = TALER_EXCHANGE_curl_easy_get_ (cgh->url);
+ if (NULL == eh)
+ {
+ GNUNET_break (0);
+ GNUNET_free (cgh->url);
+ GNUNET_free (cgh);
+ return NULL;
+ }
+ /* FIXME: add signature with purse_priv
+ to authorize the GET request!? Or
+ decide it is non-critical and only
+ pass purse_pub? */
+ cgh->job = GNUNET_CURL_job_add (TEAH_handle_to_context (exchange),
+ eh,
+ &handle_purse_get_finished,
+ cgh);
+ return cgh;
+}
+
+
+void
+TALER_EXCHANGE_purse_get_cancel (
+ struct TALER_EXCHANGE_PursesGetHandle *cgh)
+{
+ if (NULL != cgh->job)
+ {
+ GNUNET_CURL_job_cancel (cgh->job);
+ cgh->job = NULL;
+ }
+ GNUNET_free (cgh->url);
+ GNUNET_free (cgh);
+}
+
+
+/* end of exchange_api_purses_get.c */