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Diffstat (limited to 'src/lib/merchant_api_track.c')
| -rw-r--r-- | src/lib/merchant_api_track.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/lib/merchant_api_track.c b/src/lib/merchant_api_track.c new file mode 100644 index 00000000..118da638 --- /dev/null +++ b/src/lib/merchant_api_track.c @@ -0,0 +1,188 @@ +/* + This file is part of TALER + Copyright (C) 2014, 2015, 2016 GNUnet e.V. and INRIA + + TALER is free software; you can redistribute it and/or modify it under the + terms of the GNU Lesser General Public License as published by the Free Software + Foundation; either version 2.1, 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 Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License along with + TALER; see the file COPYING.LGPL. If not, If not, see + <http://www.gnu.org/licenses/> +*/ +/** + * @file lib/merchant_api_contract.c + * @brief Implementation of the /track/deposit and /track/wtid request of the + * merchant's HTTP API + * @author Marcello Stanisci + */ +#include "platform.h" +#include <curl/curl.h> +#include <jansson.h> +#include <microhttpd.h> /* just for HTTP status codes */ +#include <gnunet/gnunet_util_lib.h> +#include <gnunet/gnunet_curl_lib.h> +#include "taler_merchant_service.h" +#include <taler/taler_json_lib.h> +#include <taler/taler_signatures.h> + + +/** + * @brief A Contract Operation Handle + */ +struct TALER_MERCHANT_TrackDepositOperation +{ + + /** + * The url for this request. + */ + char *url; + + /** + * base32 identifier being the 'witd' parameter required by the + * exchange + */ + char *wtid; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_MERCHANT_TrackDepositCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Reference to the execution context. + */ + struct GNUNET_CURL_Context *ctx; +}; + + +/** + * Function called when we're done processing the + * HTTP /track/deposit request. + * + * @param cls the `struct TALER_MERCHANT_TrackDepositOperation` + * @param response_code HTTP response code, 0 on error + * @param json response body, NULL if not in JSON + */ +static void +handle_trackdeposit_finished (void *cls, + long response_code, + const json_t *json) // body +{ + struct TALER_MERCHANT_TrackDepositOperation *tdo = cls; + + tdo->job = NULL; + switch (response_code) + { + case 0: + break; + case MHD_HTTP_OK: + { + /* Work out argument for external callback from the body .. */ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "200 returned from /track/deposit"); + } + break; + case MHD_HTTP_NOT_FOUND: + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "track deposit URI not found"); + 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; + } + /* FIXME figure out wich parameters ought to be passed back */ + tdo->cb (tdo->cb_cls, + response_code, + json); +} + + +/** + * Request backend to return deposits associated with a given wtid. + * + * @param ctx execution context + * @param backend_uri URI of the backend (having /track/deposit appended) + * @param wtid base32 string indicating a wtid + * @param exchange base URL of the exchange in charge of returning the wanted information + * @param trackdeposit_cb the callback to call when a reply for this request is available + * @param trackdeposit_cb_cls closure for @a contract_cb + * @return a handle for this request + */ +struct TALER_MERCHANT_TrackDepositOperation * +TALER_MERCHANT_track_deposit (struct GNUNET_CURL_Context *ctx, + const char *backend_uri, + const char *wtid, + const char *exchange_uri, + TALER_MERCHANT_TrackDepositCallback trackdeposit_cb, + void *trackdeposit_cb_cls) +{ + struct TALER_MERCHANT_TrackDepositOperation *tdo; + CURL *eh; + + tdo = GNUNET_new (struct TALER_MERCHANT_TrackDepositOperation); + tdo->ctx = ctx; + tdo->cb = trackdeposit_cb; + tdo->cb_cls = trackdeposit_cb_cls; + /* TO BE FREED SOMEWHERE. GOTTEN WITH /track/deposit ALREADY APPENDED */ + GNUNET_asprintf (&tdo->url, + "%s?wtid=%s&exchange=%s", + backend_uri, + wtid, + exchange_uri); + eh = curl_easy_init (); + GNUNET_assert (CURLE_OK == + curl_easy_setopt (eh, + CURLOPT_URL, + tdo->url)); + tdo->job = GNUNET_CURL_job_add (ctx, + eh, + GNUNET_YES, + &handle_trackdeposit_finished, + tdo); + return tdo; +} + +/** + * Cancel a /track/deposit request. This function cannot be used + * on a request handle if a response is already served for it. + * + * @param co the deposit's tracking operation + */ +void +TALER_MERCHANT_track_deposit_cancel (struct TALER_MERCHANT_TrackDepositOperation *tdo) +{ + if (NULL != tdo->job) + { + GNUNET_CURL_job_cancel (tdo->job); + tdo->job = NULL; + } + GNUNET_free (tdo->url); + GNUNET_free (tdo->wtid); + GNUNET_free (tdo); +} + +/* end of merchant_api_track.c */ |