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-rw-r--r--src/lib/exchange_api_reserves_get_attestable.c276
1 files changed, 276 insertions, 0 deletions
diff --git a/src/lib/exchange_api_reserves_get_attestable.c b/src/lib/exchange_api_reserves_get_attestable.c
new file mode 100644
index 000000000..f58e0592e
--- /dev/null
+++ b/src/lib/exchange_api_reserves_get_attestable.c
@@ -0,0 +1,276 @@
+/*
+ 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_get_attestable.c
+ * @brief Implementation of the GET_ATTESTABLE /reserves/$RESERVE_PUB requests
+ * @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_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/ GET_ATTESTABLE Handle
+ */
+struct TALER_EXCHANGE_ReservesGetAttestHandle
+{
+
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_ReservesGetAttestCallback cb;
+
+ /**
+ * Public key of the reserve we are querying.
+ */
+ struct TALER_ReservePublicKeyP reserve_pub;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * We received an #MHD_HTTP_OK status code. Handle the JSON
+ * response.
+ *
+ * @param rgah handle of the request
+ * @param j JSON response
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+handle_reserves_get_attestable_ok (
+ struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah,
+ const json_t *j)
+{
+ struct TALER_EXCHANGE_ReserveGetAttestResult rs = {
+ .hr.reply = j,
+ .hr.http_status = MHD_HTTP_OK
+ };
+ const json_t *details;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_array_const ("details",
+ &details),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL,
+ NULL))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ {
+ unsigned int dlen = json_array_size (details);
+ const char *attributes[GNUNET_NZL (dlen)];
+
+ for (unsigned int i = 0; i<dlen; i++)
+ {
+ json_t *detail = json_array_get (details,
+ i);
+ attributes[i] = json_string_value (detail);
+ if (NULL == attributes[i])
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ }
+ rs.details.ok.attributes_length = dlen;
+ rs.details.ok.attributes = attributes;
+ rgah->cb (rgah->cb_cls,
+ &rs);
+ rgah->cb = NULL;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP GET /reserves-attest/$RID request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_ReservesGetAttestableHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_reserves_get_attestable_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah = cls;
+ const json_t *j = response;
+ struct TALER_EXCHANGE_ReserveGetAttestResult rs = {
+ .hr.reply = j,
+ .hr.http_status = (unsigned int) response_code
+ };
+
+ rgah->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_get_attestable_ok (rgah,
+ j))
+ {
+ 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 */
+ 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:
+ /* 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_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 get_attestable\n",
+ (unsigned int) response_code,
+ (int) rs.hr.ec);
+ break;
+ }
+ if (NULL != rgah->cb)
+ {
+ rgah->cb (rgah->cb_cls,
+ &rs);
+ rgah->cb = NULL;
+ }
+ TALER_EXCHANGE_reserves_get_attestable_cancel (rgah);
+}
+
+
+struct TALER_EXCHANGE_ReservesGetAttestHandle *
+TALER_EXCHANGE_reserves_get_attestable (
+ struct GNUNET_CURL_Context *ctx,
+ const char *url,
+ const struct TALER_ReservePublicKeyP *reserve_pub,
+ TALER_EXCHANGE_ReservesGetAttestCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah;
+ CURL *eh;
+ char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
+
+ {
+ char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
+ char *end;
+
+ end = GNUNET_STRINGS_data_to_string (
+ reserve_pub,
+ sizeof (*reserve_pub),
+ pub_str,
+ sizeof (pub_str));
+ *end = '\0';
+ GNUNET_snprintf (arg_str,
+ sizeof (arg_str),
+ "reserves-attest/%s",
+ pub_str);
+ }
+ rgah = GNUNET_new (struct TALER_EXCHANGE_ReservesGetAttestHandle);
+ rgah->cb = cb;
+ rgah->cb_cls = cb_cls;
+ rgah->reserve_pub = *reserve_pub;
+ rgah->url = TALER_url_join (url,
+ arg_str,
+ NULL);
+ if (NULL == rgah->url)
+ {
+ GNUNET_free (rgah);
+ return NULL;
+ }
+ eh = TALER_EXCHANGE_curl_easy_get_ (rgah->url);
+ if (NULL == eh)
+ {
+ GNUNET_break (0);
+ GNUNET_free (rgah->url);
+ GNUNET_free (rgah);
+ return NULL;
+ }
+ rgah->job = GNUNET_CURL_job_add (ctx,
+ eh,
+ &handle_reserves_get_attestable_finished,
+ rgah);
+ return rgah;
+}
+
+
+void
+TALER_EXCHANGE_reserves_get_attestable_cancel (
+ struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah)
+{
+ if (NULL != rgah->job)
+ {
+ GNUNET_CURL_job_cancel (rgah->job);
+ rgah->job = NULL;
+ }
+ GNUNET_free (rgah->url);
+ GNUNET_free (rgah);
+}
+
+
+/* end of exchange_api_reserves_get_attestable.c */