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authorChristian Grothoff <christian@grothoff.org>2019-01-11 21:27:34 +0100
committerChristian Grothoff <christian@grothoff.org>2019-01-11 21:43:15 +0100
commit54fc83ee6b910d482948c6ec8185df7aab1b0cb1 (patch)
tree10c04cad1392659a9ccef469271f866e393ebb48 /src/lib/auditor_api_exchanges.c
parent57ab9f9fdba607fcc3817adf58f37c5390f8d220 (diff)
downloadexchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.tar.gz
exchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.tar.bz2
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fix cyclic dependency by combining exchange-lib and auditor-lib directories
Diffstat (limited to 'src/lib/auditor_api_exchanges.c')
-rw-r--r--src/lib/auditor_api_exchanges.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/src/lib/auditor_api_exchanges.c b/src/lib/auditor_api_exchanges.c
new file mode 100644
index 00000000..770eedda
--- /dev/null
+++ b/src/lib/auditor_api_exchanges.c
@@ -0,0 +1,245 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014-2018 GNUnet e.V.
+
+ 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 auditor-lib/auditor_api_exchanges.c
+ * @brief Implementation of the /exchanges request of the auditor's HTTP API
+ * @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_auditor_service.h"
+#include "auditor_api_handle.h"
+#include "taler_signatures.h"
+#include "auditor_api_curl_defaults.h"
+
+/**
+ * How many exchanges do we allow a single auditor to
+ * audit at most?
+ */
+#define MAX_EXCHANGES 1024
+
+
+/**
+ * @brief A ListExchanges Handle
+ */
+struct TALER_AUDITOR_ListExchangesHandle
+{
+
+ /**
+ * The connection to auditor this request handle will use
+ */
+ struct TALER_AUDITOR_Handle *auditor;
+
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_AUDITOR_ListExchangesResultCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /deposit-confirmation request.
+ *
+ * @param cls the `struct TALER_AUDITOR_ListExchangesHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param djson parsed JSON result, NULL on error
+ */
+static void
+handle_exchanges_finished (void *cls,
+ long response_code,
+ const void *djson)
+{
+ const json_t *json = djson;
+ const json_t *ja;
+ unsigned int ja_len;
+ struct TALER_AUDITOR_ListExchangesHandle *leh = cls;
+
+ leh->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ break;
+ case MHD_HTTP_OK:
+ ja = json_object_get (json,
+ "exchanges");
+ if ( (NULL == ja) ||
+ (! json_is_array (ja)) )
+ {
+ GNUNET_break (0);
+ response_code = 0;
+ break;
+ }
+
+ ja_len = json_array_size (ja);
+ if (ja_len > MAX_EXCHANGES)
+ {
+ GNUNET_break (0);
+ response_code = 0;
+ break;
+ }
+ {
+ struct TALER_AUDITOR_ExchangeInfo ei[ja_len];
+ int ok;
+
+ ok = GNUNET_YES;
+ for (unsigned int i=0;i<ja_len;i++)
+ {
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto ("master_pub", &ei[i].master_pub),
+ GNUNET_JSON_spec_string ("exchange_url", &ei[i].exchange_url),
+ GNUNET_JSON_spec_end()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (json_array_get (ja,
+ i),
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ ok = GNUNET_NO;
+ break;
+ }
+ }
+ if (GNUNET_YES != ok)
+ break;
+ leh->cb (leh->cb_cls,
+ response_code,
+ TALER_EC_NONE,
+ ja_len,
+ ei,
+ json);
+ leh->cb = NULL;
+ }
+ break;
+ case MHD_HTTP_BAD_REQUEST:
+ /* This should never happen, either us or the auditor is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ break;
+ case MHD_HTTP_NOT_FOUND:
+ /* Nothing really to verify, this should never
+ happen, we should pass the JSON 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;
+ }
+ if (NULL != leh->cb)
+ leh->cb (leh->cb_cls,
+ response_code,
+ TALER_JSON_get_error_code (json),
+ 0,
+ NULL,
+ json);
+ TALER_AUDITOR_list_exchanges_cancel (leh);
+}
+
+
+/**
+ * Submit an /exchanges request to the auditor and get the
+ * auditor's response. If the auditor's reply is not
+ * well-formed, we return an HTTP status code of zero to @a cb.
+ *
+ * @param auditor the auditor handle; the auditor must be ready to operate
+ * @param cb the callback to call when a reply for this request is available
+ * @param cb_cls closure for the above callback
+ * @return a handle for this request; NULL if the inputs are invalid (i.e.
+ * signatures fail to verify). In this case, the callback is not called.
+ */
+struct TALER_AUDITOR_ListExchangesHandle *
+TALER_AUDITOR_list_exchanges (struct TALER_AUDITOR_Handle *auditor,
+ TALER_AUDITOR_ListExchangesResultCallback cb,
+ void *cb_cls)
+{
+ struct TALER_AUDITOR_ListExchangesHandle *leh;
+ struct GNUNET_CURL_Context *ctx;
+ CURL *eh;
+
+ GNUNET_assert (GNUNET_YES ==
+ MAH_handle_is_ready (auditor));
+
+ leh = GNUNET_new (struct TALER_AUDITOR_ListExchangesHandle);
+ leh->auditor = auditor;
+ leh->cb = cb;
+ leh->cb_cls = cb_cls;
+ leh->url = MAH_path_to_url (auditor, "/exchanges");
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "URL for list-exchanges: `%s'\n",
+ leh->url);
+ eh = TAL_curl_easy_get (leh->url);
+ ctx = MAH_handle_to_context (auditor);
+ leh->job = GNUNET_CURL_job_add (ctx,
+ eh,
+ GNUNET_NO,
+ &handle_exchanges_finished,
+ leh);
+ return leh;
+}
+
+
+/**
+ * Cancel a deposit-confirmation permission request. This function cannot be used
+ * on a request handle if a response is already served for it.
+ *
+ * @param deposit-confirmation the deposit-confirmation permission request handle
+ */
+void
+TALER_AUDITOR_list_exchanges_cancel (struct TALER_AUDITOR_ListExchangesHandle *leh)
+{
+ if (NULL != leh->job)
+ {
+ GNUNET_CURL_job_cancel (leh->job);
+ leh->job = NULL;
+ }
+ GNUNET_free (leh->url);
+ GNUNET_free (leh);
+}
+
+
+/* end of auditor_api_exchanges.c */