implement libtalerexchange:reserve_get_attest API
This commit is contained in:
Christian Grothoff
parent
0de4db7755
commit
33680940fe
@ -62,6 +62,7 @@ libtalerexchange_la_SOURCES = \
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exchange_api_refund.c \
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exchange_api_reserves_close.c \
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exchange_api_reserves_get.c \
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exchange_api_reserves_get_attestable.c \
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exchange_api_reserves_history.c \
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exchange_api_reserves_open.c \
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exchange_api_reserves_status.c \
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290
src/lib/exchange_api_reserves_get_attestable.c
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290
src/lib/exchange_api_reserves_get_attestable.c
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@ -0,0 +1,290 @@
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/*
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This file is part of TALER
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Copyright (C) 2014-2022 Taler Systems SA
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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 lib/exchange_api_reserves_get_attestable.c
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* @brief Implementation of the GET_ATTESTABLE /reserves/$RESERVE_PUB requests
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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_exchange_service.h"
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#include "taler_json_lib.h"
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#include "exchange_api_handle.h"
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#include "taler_signatures.h"
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#include "exchange_api_curl_defaults.h"
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/**
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* @brief A /reserves/ GET_ATTESTABLE Handle
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*/
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struct TALER_EXCHANGE_ReservesGetAttestHandle
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{
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/**
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* The connection to exchange this request handle will use
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*/
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struct TALER_EXCHANGE_Handle *exchange;
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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_EXCHANGE_ReservesGetAttestCallback cb;
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/**
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* Public key of the reserve we are querying.
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*/
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struct TALER_ReservePublicKeyP reserve_pub;
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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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* We received an #MHD_HTTP_OK status code. Handle the JSON
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* response.
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*
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* @param rgah handle of the request
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* @param j JSON response
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* @return #GNUNET_OK on success
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*/
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static enum GNUNET_GenericReturnValue
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handle_reserves_get_attestable_ok (
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struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah,
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const json_t *j)
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{
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struct TALER_EXCHANGE_ReserveGetAttestResult rs = {
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.hr.reply = j,
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.hr.http_status = MHD_HTTP_OK
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};
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json_t *details;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_json ("details",
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&details),
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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 (j,
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spec,
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NULL,
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NULL))
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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{
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unsigned int dlen = json_array_size (details);
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const char *attributes[GNUNET_NZL (dlen)];
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for (unsigned int i = 0; i<dlen; i++)
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{
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json_t *detail = json_array_get (details,
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i);
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attributes[i] = json_string_value (detail);
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if (NULL == attributes[i])
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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}
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rs.details.ok.attributes_length = dlen;
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rs.details.ok.attributes = attributes;
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rgah->cb (rgah->cb_cls,
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&rs);
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rgah->cb = NULL;
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}
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GNUNET_JSON_parse_free (spec);
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return GNUNET_OK;
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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 GET /reserves/$RID/attest request.
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*
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* @param cls the `struct TALER_EXCHANGE_ReservesGetAttestableHandle`
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* @param response_code HTTP response code, 0 on error
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* @param response parsed JSON result, NULL on error
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*/
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static void
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handle_reserves_get_attestable_finished (void *cls,
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long response_code,
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const void *response)
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{
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struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah = cls;
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const json_t *j = response;
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struct TALER_EXCHANGE_ReserveGetAttestResult rs = {
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.hr.reply = j,
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.hr.http_status = (unsigned int) response_code
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};
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rgah->job = NULL;
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switch (response_code)
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{
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case 0:
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rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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case MHD_HTTP_OK:
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if (GNUNET_OK !=
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handle_reserves_get_attestable_ok (rgah,
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j))
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{
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rs.hr.http_status = 0;
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rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
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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 exchange is buggy
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(or API version conflict); just pass JSON reply to the application */
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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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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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_CONFLICT:
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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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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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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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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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break;
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default:
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/* unexpected response code */
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GNUNET_break_op (0);
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u/%d for reserves get_attestable\n",
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(unsigned int) response_code,
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(int) rs.hr.ec);
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break;
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}
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if (NULL != rgah->cb)
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{
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rgah->cb (rgah->cb_cls,
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&rs);
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rgah->cb = NULL;
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}
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TALER_EXCHANGE_reserves_get_attestable_cancel (rgah);
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}
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struct TALER_EXCHANGE_ReservesGetAttestHandle *
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TALER_EXCHANGE_reserves_get_attestable (
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struct TALER_EXCHANGE_Handle *exchange,
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const struct TALER_ReservePublicKeyP *reserve_pub,
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TALER_EXCHANGE_ReservesGetAttestCallback cb,
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void *cb_cls)
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{
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struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah;
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struct GNUNET_CURL_Context *ctx;
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CURL *eh;
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char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
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if (GNUNET_YES !=
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TEAH_handle_is_ready (exchange))
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{
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GNUNET_break (0);
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return NULL;
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}
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{
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char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
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char *end;
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end = GNUNET_STRINGS_data_to_string (
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reserve_pub,
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sizeof (*reserve_pub),
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pub_str,
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sizeof (pub_str));
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*end = '\0';
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GNUNET_snprintf (arg_str,
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sizeof (arg_str),
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"/reserves/%s/attest",
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pub_str);
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}
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rgah = GNUNET_new (struct TALER_EXCHANGE_ReservesGetAttestHandle);
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rgah->exchange = exchange;
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rgah->cb = cb;
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rgah->cb_cls = cb_cls;
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rgah->reserve_pub = *reserve_pub;
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rgah->url = TEAH_path_to_url (exchange,
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arg_str);
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if (NULL == rgah->url)
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{
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GNUNET_free (rgah);
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return NULL;
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}
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eh = TALER_EXCHANGE_curl_easy_get_ (rgah->url);
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if (NULL == eh)
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{
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GNUNET_break (0);
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GNUNET_free (rgah->url);
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GNUNET_free (rgah);
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return NULL;
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}
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ctx = TEAH_handle_to_context (exchange);
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rgah->job = GNUNET_CURL_job_add (ctx,
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eh,
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&handle_reserves_get_attestable_finished,
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rgah);
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return rgah;
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}
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void
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TALER_EXCHANGE_reserves_get_attestable_cancel (
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struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah)
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{
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if (NULL != rgah->job)
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{
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GNUNET_CURL_job_cancel (rgah->job);
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rgah->job = NULL;
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}
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GNUNET_free (rgah->url);
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GNUNET_free (rgah);
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}
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/* end of exchange_api_reserves_get_attestable.c */
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