implement /exchanges API in libtalerauditor
This commit is contained in:
Christian Grothoff
parent
af41624591
commit
a57080651d
@ -15,7 +15,8 @@ libtalerauditor_la_LDFLAGS = \
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libtalerauditor_la_SOURCES = \
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curl_defaults.c \
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auditor_api_handle.c auditor_api_handle.h \
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auditor_api_deposit_confirmation.c
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auditor_api_deposit_confirmation.c \
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auditor_api_exchanges.c
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libtalerauditor_la_LIBADD = \
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$(top_builddir)/src/json/libtalerjson.la \
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$(top_builddir)/src/util/libtalerutil.la \
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245
src/auditor-lib/auditor_api_exchanges.c
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245
src/auditor-lib/auditor_api_exchanges.c
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@ -0,0 +1,245 @@
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/*
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This file is part of TALER
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Copyright (C) 2014-2018 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file auditor-lib/auditor_api_exchanges.c
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* @brief Implementation of the /exchanges request of the auditor's HTTP API
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <jansson.h>
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#include <microhttpd.h> /* just for HTTP status codes */
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_json_lib.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_json_lib.h"
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#include "taler_auditor_service.h"
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#include "auditor_api_handle.h"
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#include "taler_signatures.h"
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#include "curl_defaults.h"
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/**
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* How many exchanges do we allow a single auditor to
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* audit at most?
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*/
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#define MAX_EXCHANGES 1024
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/**
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* @brief A ListExchanges Handle
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*/
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struct TALER_AUDITOR_ListExchangesHandle
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{
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/**
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* The connection to auditor this request handle will use
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*/
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struct TALER_AUDITOR_Handle *auditor;
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/**
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* The url for this request.
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*/
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char *url;
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/**
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* Handle for the request.
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*/
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struct GNUNET_CURL_Job *job;
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/**
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* Function to call with the result.
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*/
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TALER_AUDITOR_ListExchangesResultCallback cb;
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/**
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* Closure for @a cb.
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*/
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void *cb_cls;
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};
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/**
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* Function called when we're done processing the
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* HTTP /deposit-confirmation request.
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*
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* @param cls the `struct TALER_AUDITOR_ListExchangesHandle`
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* @param response_code HTTP response code, 0 on error
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* @param djson parsed JSON result, NULL on error
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*/
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static void
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handle_exchanges_finished (void *cls,
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long response_code,
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const void *djson)
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{
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const json_t *json = djson;
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const json_t *ja;
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unsigned int ja_len;
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struct TALER_AUDITOR_ListExchangesHandle *leh = cls;
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leh->job = NULL;
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switch (response_code)
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{
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case 0:
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break;
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case MHD_HTTP_OK:
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ja = json_object_get (json,
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"exchanges");
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if ( (NULL == ja) ||
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(! json_is_array (ja)) )
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{
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GNUNET_break (0);
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response_code = 0;
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break;
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}
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ja_len = json_array_size (ja);
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if (ja_len > MAX_EXCHANGES)
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{
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GNUNET_break (0);
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response_code = 0;
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break;
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}
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{
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struct TALER_AUDITOR_ExchangeInfo ei[ja_len];
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int ok;
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ok = GNUNET_YES;
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for (unsigned int i=0;i<ja_len;i++)
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{
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_fixed_auto ("master_pub", &ei[i].master_pub),
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GNUNET_JSON_spec_string ("exchange_url", &ei[i].exchange_url),
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GNUNET_JSON_spec_end()
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};
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if (GNUNET_OK !=
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GNUNET_JSON_parse (json_array_get (ja,
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i),
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spec,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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ok = GNUNET_NO;
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break;
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}
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}
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if (GNUNET_YES != ok)
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break;
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leh->cb (leh->cb_cls,
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response_code,
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TALER_EC_NONE,
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ja_len,
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ei,
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json);
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leh->cb = NULL;
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}
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break;
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case MHD_HTTP_BAD_REQUEST:
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/* This should never happen, either us or the auditor is buggy
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(or API version conflict); just pass JSON reply to the application */
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break;
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case MHD_HTTP_NOT_FOUND:
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/* Nothing really to verify, this should never
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happen, we should pass the JSON reply to the application */
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break;
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case MHD_HTTP_INTERNAL_SERVER_ERROR:
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/* Server had an internal issue; we should retry, but this API
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leaves this to the application */
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break;
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default:
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/* unexpected response code */
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u\n",
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(unsigned int) response_code);
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GNUNET_break (0);
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response_code = 0;
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break;
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}
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if (NULL != leh->cb)
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leh->cb (leh->cb_cls,
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response_code,
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TALER_JSON_get_error_code (json),
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0,
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NULL,
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json);
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TALER_AUDITOR_list_exchanges_cancel (leh);
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}
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/**
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* Submit an /exchanges request to the auditor and get the
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* auditor's response. If the auditor's reply is not
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* well-formed, we return an HTTP status code of zero to @a cb.
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*
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* @param auditor the auditor handle; the auditor must be ready to operate
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* @param cb the callback to call when a reply for this request is available
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* @param cb_cls closure for the above callback
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* @return a handle for this request; NULL if the inputs are invalid (i.e.
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* signatures fail to verify). In this case, the callback is not called.
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*/
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struct TALER_AUDITOR_ListExchangesHandle *
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TALER_AUDITOR_list_exchanges (struct TALER_AUDITOR_Handle *auditor,
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TALER_AUDITOR_ListExchangesResultCallback cb,
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void *cb_cls)
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{
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struct TALER_AUDITOR_ListExchangesHandle *leh;
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struct GNUNET_CURL_Context *ctx;
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CURL *eh;
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GNUNET_assert (GNUNET_YES ==
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MAH_handle_is_ready (auditor));
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leh = GNUNET_new (struct TALER_AUDITOR_ListExchangesHandle);
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leh->auditor = auditor;
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leh->cb = cb;
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leh->cb_cls = cb_cls;
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leh->url = MAH_path_to_url (auditor, "/exchanges");
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GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
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"URL for list-exchanges: `%s'\n",
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leh->url);
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eh = TAL_curl_easy_get (leh->url);
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ctx = MAH_handle_to_context (auditor);
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leh->job = GNUNET_CURL_job_add (ctx,
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eh,
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GNUNET_NO,
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&handle_exchanges_finished,
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leh);
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return leh;
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}
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/**
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* Cancel a deposit-confirmation permission request. This function cannot be used
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* on a request handle if a response is already served for it.
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*
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* @param deposit-confirmation the deposit-confirmation permission request handle
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*/
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void
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TALER_AUDITOR_list_exchanges_cancel (struct TALER_AUDITOR_ListExchangesHandle *leh)
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{
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if (NULL != leh->job)
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{
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GNUNET_CURL_job_cancel (leh->job);
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leh->job = NULL;
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}
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GNUNET_free (leh->url);
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GNUNET_free (leh);
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}
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/* end of auditor_api_exchanges.c */
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@ -240,4 +240,75 @@ TALER_AUDITOR_deposit_confirmation (struct TALER_AUDITOR_Handle *auditor,
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void
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TALER_AUDITOR_deposit_confirmation_cancel (struct TALER_AUDITOR_DepositConfirmationHandle *deposit_confirmation);
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/**
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* Handle for /exchanges API returned by
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* #TALER_AUDITOR_list_exchanges() so that the operation can be
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* cancelled with #TALER_AUDITOR_list_exchanges_cancel()
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*/
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struct TALER_AUDITOR_ListExchangesHandle;
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/**
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* Information about an exchange kept by the auditor.
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*/
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struct TALER_AUDITOR_ExchangeInfo
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{
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/**
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* Master public key of the exchange.
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*/
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struct TALER_MasterPublicKeyP master_pub;
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/**
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* Base URL of the exchange's API.
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*/
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const char *exchange_url;
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};
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/**
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* Function called with the result from /exchagnes.
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*
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* @param cls closure
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* @param http_status the HTTP status code, 200 on success
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* @param ec detailed Taler error status code, #TALER_EC_NONE on success
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* @param num_exchanges length of array at @a ei
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* @param ei information about exchanges returned by the auditor
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* @param raw_response raw JSON response
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*/
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typedef void
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(*TALER_AUDITOR_ListExchangesResultCallback)(void *cls,
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unsigned int http_status,
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enum TALER_ErrorCode ec,
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unsigned int num_exchanges,
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const struct TALER_AUDITOR_ExchangeInfo *ei,
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const json_t *raw_response);
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/**
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* Submit an /exchanges request to the auditor and get the
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* auditor's response. If the auditor's reply is not
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* well-formed, we return an HTTP status code of zero to @a cb.
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*
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* @param auditor the auditor handle; the auditor must be ready to operate
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* @param cb the callback to call when a reply for this request is available
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* @param cb_cls closure for the above callback
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* @return a handle for this request; NULL if the inputs are invalid (i.e.
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* signatures fail to verify). In this case, the callback is not called.
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*/
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struct TALER_AUDITOR_ListExchangesHandle *
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TALER_AUDITOR_list_exchanges (struct TALER_AUDITOR_Handle *auditor,
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TALER_AUDITOR_ListExchangesResultCallback cb,
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void *cb_cls);
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/**
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* Cancel a deposit-confirmation permission request. This function cannot be used
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* on a request handle if a response is already served for it.
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*
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* @param deposit-confirmation the deposit-confirmation permission request handle
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*/
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void
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TALER_AUDITOR_list_exchanges_cancel (struct TALER_AUDITOR_ListExchangesHandle *leh);
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#endif /* _TALER_AUDITOR_SERVICE_H */
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