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authorChristian Grothoff <christian@grothoff.org>2022-09-27 15:21:51 +0200
committerChristian Grothoff <christian@grothoff.org>2022-09-27 15:21:51 +0200
commit0de4db77551458ad338bda8a76ec2c70484550f8 (patch)
treeb73c3a4148e7ab51cd0eddb630179a332fe38c0a /src/lib
parent7d8c49b3c74865331fb9d269a9efdb9ba0f52eab (diff)
downloadexchange-0de4db77551458ad338bda8a76ec2c70484550f8.tar.gz
exchange-0de4db77551458ad338bda8a76ec2c70484550f8.tar.bz2
exchange-0de4db77551458ad338bda8a76ec2c70484550f8.zip
implement libtalerexchange:reserve_close API
Diffstat (limited to 'src/lib')
-rw-r--r--src/lib/Makefile.am1
-rw-r--r--src/lib/exchange_api_reserves_close.c385
-rw-r--r--src/lib/exchange_api_reserves_open.c7
3 files changed, 393 insertions, 0 deletions
diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 959cdc7ed..73ae3003d 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -60,6 +60,7 @@ libtalerexchange_la_SOURCES = \
exchange_api_refresh_common.c exchange_api_refresh_common.h \
exchange_api_refreshes_reveal.c \
exchange_api_refund.c \
+ exchange_api_reserves_close.c \
exchange_api_reserves_get.c \
exchange_api_reserves_history.c \
exchange_api_reserves_open.c \
diff --git a/src/lib/exchange_api_reserves_close.c b/src/lib/exchange_api_reserves_close.c
new file mode 100644
index 000000000..278d13101
--- /dev/null
+++ b/src/lib/exchange_api_reserves_close.c
@@ -0,0 +1,385 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014-2022 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_reserves_close.c
+ * @brief Implementation of the POST /reserves/$RESERVE_PUB/close requests
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP close codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_exchange_service.h"
+#include "taler_json_lib.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * @brief A /reserves/$RID/close Handle
+ */
+struct TALER_EXCHANGE_ReservesCloseHandle
+{
+
+ /**
+ * 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;
+
+ /**
+ * Context for #TEH_curl_easy_post(). Keeps the data that must
+ * persist for Curl to make the upload.
+ */
+ struct TALER_CURL_PostContext post_ctx;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_ReservesCloseCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Public key of the reserve we are querying.
+ */
+ struct TALER_ReservePublicKeyP reserve_pub;
+
+ /**
+ * Our signature.
+ */
+ struct TALER_ReserveSignatureP reserve_sig;
+
+ /**
+ * When did we make the request.
+ */
+ struct GNUNET_TIME_Timestamp ts;
+
+};
+
+
+/**
+ * We received an #MHD_HTTP_OK close code. Handle the JSON
+ * response.
+ *
+ * @param rch handle of the request
+ * @param j JSON response
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+handle_reserves_close_ok (struct TALER_EXCHANGE_ReservesCloseHandle *rch,
+ const json_t *j)
+{
+ struct TALER_EXCHANGE_ReserveCloseResult rs = {
+ .hr.reply = j,
+ .hr.http_status = MHD_HTTP_OK,
+ };
+ struct GNUNET_JSON_Specification spec[] = {
+ TALER_JSON_spec_amount_any ("wire_amount",
+ &rs.details.ok.wire_amount),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL,
+ NULL))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ rch->cb (rch->cb_cls,
+ &rs);
+ rch->cb = NULL;
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_OK;
+}
+
+
+/**
+ * We received an #MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS close code. Handle the JSON
+ * response.
+ *
+ * @param rch handle of the request
+ * @param j JSON response
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+handle_reserves_close_kyc (struct TALER_EXCHANGE_ReservesCloseHandle *rch,
+ const json_t *j)
+{
+ struct TALER_EXCHANGE_ReserveCloseResult rs = {
+ .hr.reply = j,
+ .hr.http_status = MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS,
+ };
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto (
+ "h_payto",
+ &rs.details.unavailable_for_legal_reasons.h_payto),
+ GNUNET_JSON_spec_uint64 (
+ "requirement_row",
+ &rs.details.unavailable_for_legal_reasons.requirement_row),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL,
+ NULL))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ rch->cb (rch->cb_cls,
+ &rs);
+ rch->cb = NULL;
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /reserves/$RID/close request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_ReservesCloseHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_reserves_close_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_EXCHANGE_ReservesCloseHandle *rch = cls;
+ const json_t *j = response;
+ struct TALER_EXCHANGE_ReserveCloseResult rs = {
+ .hr.reply = j,
+ .hr.http_status = (unsigned int) response_code
+ };
+
+ rch->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+ break;
+ case MHD_HTTP_OK:
+ if (GNUNET_OK !=
+ handle_reserves_close_ok (rch,
+ j))
+ {
+ GNUNET_break_op (0);
+ rs.hr.http_status = 0;
+ rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+ }
+ 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 */
+ GNUNET_break (0);
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_FORBIDDEN:
+ /* This should never happen, either us or the exchange is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ GNUNET_break (0);
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_NOT_FOUND:
+ /* Nothing really to verify, this should never
+ happen, we should pass the JSON reply to the application */
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_CONFLICT:
+ /* Insufficient balance to inquire for reserve close */
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
+ if (GNUNET_OK !=
+ handle_reserves_close_kyc (rch,
+ j))
+ {
+ GNUNET_break_op (0);
+ rs.hr.http_status = 0;
+ rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+ }
+ break;
+ case MHD_HTTP_INTERNAL_SERVER_ERROR:
+ /* Server had an internal issue; we should retry, but this API
+ leaves this to the application */
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ default:
+ /* unexpected response code */
+ GNUNET_break_op (0);
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Unexpected response code %u/%d for reserves close\n",
+ (unsigned int) response_code,
+ (int) rs.hr.ec);
+ break;
+ }
+ if (NULL != rch->cb)
+ {
+ rch->cb (rch->cb_cls,
+ &rs);
+ rch->cb = NULL;
+ }
+ TALER_EXCHANGE_reserves_close_cancel (rch);
+}
+
+
+struct TALER_EXCHANGE_ReservesCloseHandle *
+TALER_EXCHANGE_reserves_close (
+ struct TALER_EXCHANGE_Handle *exchange,
+ const struct TALER_ReservePrivateKeyP *reserve_priv,
+ const char *target_payto_uri,
+ TALER_EXCHANGE_ReservesCloseCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_ReservesCloseHandle *rch;
+ struct GNUNET_CURL_Context *ctx;
+ CURL *eh;
+ char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
+ struct TALER_PaytoHashP h_payto;
+
+ if (GNUNET_YES !=
+ TEAH_handle_is_ready (exchange))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ rch = GNUNET_new (struct TALER_EXCHANGE_ReservesCloseHandle);
+ rch->exchange = exchange;
+ rch->cb = cb;
+ rch->cb_cls = cb_cls;
+ rch->ts = GNUNET_TIME_timestamp_get ();
+ GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
+ &rch->reserve_pub.eddsa_pub);
+ {
+ char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
+ char *end;
+
+ end = GNUNET_STRINGS_data_to_string (
+ &rch->reserve_pub,
+ sizeof (rch->reserve_pub),
+ pub_str,
+ sizeof (pub_str));
+ *end = '\0';
+ GNUNET_snprintf (arg_str,
+ sizeof (arg_str),
+ "/reserves/%s/close",
+ pub_str);
+ }
+ rch->url = TEAH_path_to_url (exchange,
+ arg_str);
+ if (NULL == rch->url)
+ {
+ GNUNET_free (rch);
+ return NULL;
+ }
+ eh = TALER_EXCHANGE_curl_easy_get_ (rch->url);
+ if (NULL == eh)
+ {
+ GNUNET_break (0);
+ GNUNET_free (rch->url);
+ GNUNET_free (rch);
+ return NULL;
+ }
+ if (NULL != target_payto_uri)
+ TALER_payto_hash (target_payto_uri,
+ &h_payto);
+ TALER_wallet_reserve_close_sign (rch->ts,
+ (NULL != target_payto_uri)
+ ? &h_payto
+ : NULL,
+ reserve_priv,
+ &rch->reserve_sig);
+ {
+ json_t *close_obj = GNUNET_JSON_PACK (
+ GNUNET_JSON_pack_allow_null (
+ GNUNET_JSON_pack_string ("payto_uri",
+ target_payto_uri)),
+ GNUNET_JSON_pack_timestamp ("request_timestamp",
+ rch->ts),
+ GNUNET_JSON_pack_data_auto ("reserve_sig",
+ &rch->reserve_sig));
+
+ if (GNUNET_OK !=
+ TALER_curl_easy_post (&rch->post_ctx,
+ eh,
+ close_obj))
+ {
+ GNUNET_break (0);
+ curl_easy_cleanup (eh);
+ json_decref (close_obj);
+ GNUNET_free (rch->url);
+ GNUNET_free (rch);
+ return NULL;
+ }
+ json_decref (close_obj);
+ }
+ ctx = TEAH_handle_to_context (exchange);
+ rch->job = GNUNET_CURL_job_add2 (ctx,
+ eh,
+ rch->post_ctx.headers,
+ &handle_reserves_close_finished,
+ rch);
+ return rch;
+}
+
+
+void
+TALER_EXCHANGE_reserves_close_cancel (
+ struct TALER_EXCHANGE_ReservesCloseHandle *rch)
+{
+ if (NULL != rch->job)
+ {
+ GNUNET_CURL_job_cancel (rch->job);
+ rch->job = NULL;
+ }
+ TALER_curl_easy_post_finished (&rch->post_ctx);
+ GNUNET_free (rch->url);
+ GNUNET_free (rch);
+}
+
+
+/* end of exchange_api_reserves_close.c */
diff --git a/src/lib/exchange_api_reserves_open.c b/src/lib/exchange_api_reserves_open.c
index 8f3fab172..eb63f8fe9 100644
--- a/src/lib/exchange_api_reserves_open.c
+++ b/src/lib/exchange_api_reserves_open.c
@@ -278,6 +278,13 @@ handle_reserves_open_finished (void *cls,
rs.hr.ec = TALER_JSON_get_error_code (j);
rs.hr.hint = TALER_JSON_get_error_hint (j);
break;
+ case MHD_HTTP_CONFLICT:
+ // FIXME: not yet specified, but needed in
+ // case of double-spending or insufficient
+ // reserve balance!
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
if (GNUNET_OK !=
handle_reserves_open_kyc (roh,