diff options
Diffstat (limited to 'src/lib/merchant_api_tip_pickup2.c')
| -rw-r--r-- | src/lib/merchant_api_tip_pickup2.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/src/lib/merchant_api_tip_pickup2.c b/src/lib/merchant_api_tip_pickup2.c new file mode 100644 index 00000000..751d1267 --- /dev/null +++ b/src/lib/merchant_api_tip_pickup2.c @@ -0,0 +1,363 @@ +/* + This file is part of TALER + Copyright (C) 2014-2017, 2020 Taler Systems SA + + 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, see + <http://www.gnu.org/licenses/> +*/ +/** + * @file lib/merchant_api_tip_pickup2.c + * @brief Implementation of the /tip-pickup request of the merchant's HTTP API + * @author Marcello Stanisci + * @author Christian Grothoff + */ +#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> +#include <taler/taler_curl_lib.h> + + +/** + * @brief A handle for tracking transactions. + */ +struct TALER_MERCHANT_TipPickup2Operation +{ + + /** + * The url for this request. + */ + char *url; + + /** + * Minor context that holds body and headers. + */ + struct TALER_CURL_PostContext post_ctx; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_MERCHANT_TipPickup2Callback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Reference to the execution context. + */ + struct GNUNET_CURL_Context *ctx; + + /** + * Expected number of planchets. + */ + unsigned int num_planchets; +}; + + +/** + * We got a 200 response back from the exchange (or the merchant). + * Now we need to parse the response and if it is well-formed, + * call the callback (and set it to NULL afterwards). + * + * @param tpo handle of the original authorization operation + * @param json cryptographic proof returned by the exchange/merchant + * @return #GNUNET_OK if response is valid + */ +static int +check_ok (struct TALER_MERCHANT_TipPickup2Operation *tpo, + const json_t *json) +{ + json_t *ja; + unsigned int ja_len; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_json ("blind_sigs", &ja), + GNUNET_JSON_spec_end () + }; + struct TALER_MERCHANT_HttpResponse hr = { + .http_status = MHD_HTTP_OK, + .reply = json + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (json, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + ja_len = json_array_size (ja); + if (ja_len != tpo->num_planchets) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + { + struct TALER_MERCHANT_BlindSignature mblind_sigs[ja_len]; + struct GNUNET_CRYPTO_RsaSignature *blind_sigs[ja_len]; + + for (unsigned int i = 0; i<ja_len; i++) + { + json_t *pj = json_array_get (ja, i); + struct GNUNET_JSON_Specification ispec[] = { + GNUNET_JSON_spec_rsa_signature ("blind_sig", &blind_sigs[i]), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (pj, + ispec, + NULL, NULL)) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return GNUNET_SYSERR; + } + mblind_sigs[i].blind_sig = blind_sigs[i]; + } + tpo->cb (tpo->cb_cls, + &hr, + ja_len, + mblind_sigs); + for (unsigned int i = 0; i<ja_len; i++) + GNUNET_CRYPTO_rsa_signature_free (blind_sigs[i]); + tpo->cb = NULL; /* do not call twice */ + } + GNUNET_JSON_parse_free (spec); + return GNUNET_OK; +} + + +/** + * Function called when we're done processing the + * HTTP /track/transaction request. + * + * @param cls the `struct TALER_MERCHANT_TipPickupOperation` + * @param response_code HTTP response code, 0 on error + * @param json response body, NULL if not in JSON + */ +static void +handle_tip_pickup_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_MERCHANT_TipPickup2Operation *tpo = cls; + const json_t *json = response; + struct TALER_MERCHANT_HttpResponse hr = { + .http_status = (unsigned int) response_code, + .reply = json + }; + + tpo->job = NULL; + switch (response_code) + { + case MHD_HTTP_OK: + if (GNUNET_OK != check_ok (tpo, + json)) + { + GNUNET_break_op (0); + hr.http_status = 0; + hr.ec = TALER_EC_INVALID_RESPONSE; + } + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + break; + case MHD_HTTP_CONFLICT: + /* legal, can happen if we pickup a tip twice... */ + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + break; + case MHD_HTTP_NOT_FOUND: + /* legal, can happen if tip ID is unknown */ + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + break; + default: + /* unexpected response code */ + GNUNET_break_op (0); + TALER_MERCHANT_parse_error_details_ (json, + response_code, + &hr); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d\n", + (unsigned int) response_code, + (int) hr.ec); + break; + } + if (NULL != tpo->cb) + { + tpo->cb (tpo->cb_cls, + &hr, + 0, + NULL); + tpo->cb = NULL; + } + TALER_MERCHANT_tip_pickup2_cancel (tpo); +} + + +/** + * Issue a /tip-pickup request to the backend. Informs the backend + * that a customer wants to pick up a tip. + * + * @param ctx execution context + * @param backend_url base URL of the merchant backend + * @param tip_id unique identifier for the tip + * @param num_planches number of planchets provided in @a planchets + * @param planchets array of planchets to be signed into existence for the tip + * @param pickup_cb callback which will work the response gotten from the backend + * @param pickup_cb_cls closure to pass to @a pickup_cb + * @return handle for this operation, NULL upon errors + */ +struct TALER_MERCHANT_TipPickup2Operation * +TALER_MERCHANT_tip_pickup2 (struct GNUNET_CURL_Context *ctx, + const char *backend_url, + const struct GNUNET_HashCode *tip_id, + unsigned int num_planchets, + struct TALER_PlanchetDetail *planchets, + TALER_MERCHANT_TipPickup2Callback pickup_cb, + void *pickup_cb_cls) +{ + struct TALER_MERCHANT_TipPickup2Operation *tpo; + CURL *eh; + json_t *pa; + json_t *tp_obj; + + if (0 == num_planchets) + { + GNUNET_break (0); + return NULL; + } + pa = json_array (); + for (unsigned int i = 0; i<num_planchets; i++) + { + const struct TALER_PlanchetDetail *planchet = &planchets[i]; + json_t *p; + + p = json_pack ("{" + " s:o," /* denom_pub_hash */ + " s:o," /* coin_ev */ + "}", + "denom_pub_hash", GNUNET_JSON_from_data_auto ( + &planchet->denom_pub_hash), + "coin_ev", GNUNET_JSON_from_data (planchet->coin_ev, + planchet->coin_ev_size)); + if (NULL == p) + { + GNUNET_break (0); + json_decref (pa); + return NULL; + } + if (0 != + json_array_append_new (pa, + p)) + { + GNUNET_break (0); + json_decref (pa); + return NULL; + } + } + tp_obj = json_pack ("{" + " s:o," /* tip_id */ + " s:o," /* planchets */ + "}", + "tip_id", GNUNET_JSON_from_data_auto (tip_id), + "planchets", pa); + if (NULL == tp_obj) + { + GNUNET_break (0); + return NULL; + } + tpo = GNUNET_new (struct TALER_MERCHANT_TipPickup2Operation); + tpo->num_planchets = num_planchets; + tpo->ctx = ctx; + tpo->cb = pickup_cb; + tpo->cb_cls = pickup_cb_cls; + + tpo->url = TALER_url_join (backend_url, + "tip-pickup", + NULL); + if (NULL == tpo->url) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Could not construct request URL.\n"); + json_decref (tp_obj); + GNUNET_free (tpo); + return NULL; + } + eh = curl_easy_init (); + if (GNUNET_OK != TALER_curl_easy_post (&tpo->post_ctx, + eh, + tp_obj)) + { + GNUNET_break (0); + json_decref (tp_obj); + GNUNET_free (tpo); + return NULL; + } + json_decref (tp_obj); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Requesting URL '%s'\n", + tpo->url); + + GNUNET_assert (CURLE_OK == curl_easy_setopt (eh, + CURLOPT_URL, + tpo->url)); + tpo->job = GNUNET_CURL_job_add2 (ctx, + eh, + tpo->post_ctx.headers, + &handle_tip_pickup_finished, + tpo); + return tpo; +} + + +/** + * Cancel a /track/transaction request. This function cannot be used + * on a request handle if a response is already served for it. + * + * @param tpo handle to the tracking operation being cancelled + */ +void +TALER_MERCHANT_tip_pickup2_cancel ( + struct TALER_MERCHANT_TipPickup2Operation *tpo) +{ + if (NULL != tpo->job) + { + GNUNET_CURL_job_cancel (tpo->job); + tpo->job = NULL; + } + TALER_curl_easy_post_finished (&tpo->post_ctx); + GNUNET_free (tpo->url); + GNUNET_free (tpo); +} + + +/* end of merchant_api_tip_pickup2.c */ |