diff options
Diffstat (limited to 'src/lib/merchant_api_proposal_lookup.c')
| -rw-r--r-- | src/lib/merchant_api_proposal_lookup.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/src/lib/merchant_api_proposal_lookup.c b/src/lib/merchant_api_proposal_lookup.c new file mode 100644 index 00000000..0f2b0f3e --- /dev/null +++ b/src/lib/merchant_api_proposal_lookup.c @@ -0,0 +1,279 @@ +/* + This file is part of TALER + Copyright (C) 2014-2020 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_proposal_lookup.c + * @brief Implementation of the /proposal GET + * @author Christian Grothoff + * @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> +#include <taler/taler_curl_lib.h> + + +/** + * Structure representing a GET /proposal operation. + */ +struct TALER_MERCHANT_ProposalLookupOperation +{ + /** + * Full URL, includes "/proposal". + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_MERCHANT_ProposalLookupOperationCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Reference to the execution context. + */ + struct GNUNET_CURL_Context *ctx; + + /** + * Should we send the lookup operation with a nonce? + */ + int has_nonce; + + /** + * Nonce, only initialized if has_nonce is GNUNET_YES. + */ + struct GNUNET_CRYPTO_EddsaPublicKey nonce; + +}; + + +/** + * Function called when we're done processing the GET /proposal request. + * + * @param cls the `struct TALER_MERCHANT_ProposalLookupOperation` + * @param response_code HTTP response code, 0 on error + * @param json response body, should be NULL + */ +static void +handle_proposal_lookup_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_MERCHANT_ProposalLookupOperation *plo = cls; + json_t *contract_terms; + struct TALER_MerchantSignatureP sig; + struct GNUNET_HashCode hash; + const json_t *json = response; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_json ("contract_terms", + &contract_terms), + GNUNET_JSON_spec_fixed_auto ("sig", + &sig), + GNUNET_JSON_spec_end () + }; + struct TALER_MERCHANT_HttpResponse hr = { + .http_status = (unsigned int) response_code, + .reply = json + }; + + plo->job = NULL; + if (MHD_HTTP_OK != response_code) + { + hr.ec = TALER_JSON_get_error_code (json); + hr.hint = TALER_JSON_get_error_hint (json); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Proposal lookup failed with HTTP status code %u/%d\n", + (unsigned int) response_code, + (int) hr.ec); + plo->cb (plo->cb_cls, + &hr, + NULL, + NULL, + NULL); + TALER_MERCHANT_proposal_lookup_cancel (plo); + return; + } + + if (GNUNET_OK != + GNUNET_JSON_parse (json, + spec, + NULL, NULL)) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "proposal lookup failed to parse JSON\n"); + GNUNET_break_op (0); + hr.ec = TALER_EC_INVALID_RESPONSE; + hr.http_status = 0; + plo->cb (plo->cb_cls, + &hr, + NULL, + NULL, + NULL); + TALER_MERCHANT_proposal_lookup_cancel (plo); + return; + } + + if (GNUNET_OK != + TALER_JSON_hash (contract_terms, + &hash)) + { + GNUNET_break (0); + hr.ec = TALER_EC_CLIENT_INTERNAL_FAILURE; + hr.http_status = 0; + GNUNET_JSON_parse_free (spec); + plo->cb (plo->cb_cls, + &hr, + NULL, + NULL, + NULL); + TALER_MERCHANT_proposal_lookup_cancel (plo); + return; + } + + plo->job = NULL; + /** + * As no data is supposed to be extracted from this + * call, we just invoke the provided callback. + */ + plo->cb (plo->cb_cls, + &hr, + contract_terms, + &sig, + &hash); + GNUNET_JSON_parse_free (spec); + TALER_MERCHANT_proposal_lookup_cancel (plo); +} + + +/** + * Calls the GET /proposal API at the backend. That is, + * retrieve a proposal data by providing its transaction id. + * + * @param ctx execution context + * @param backend_url base URL of the merchant backend + * @param order_id order id used to perform the lookup + * @param nonce nonce used to perform the lookup + * @param plo_cb callback which will work the response gotten from the backend + * @param plo_cb_cls closure to pass to @a history_cb + * @return handle for this operation, NULL upon errors + */ +struct TALER_MERCHANT_ProposalLookupOperation * +TALER_MERCHANT_proposal_lookup ( + struct GNUNET_CURL_Context *ctx, + const char *backend_url, + const char *order_id, + const struct GNUNET_CRYPTO_EddsaPublicKey *nonce, + TALER_MERCHANT_ProposalLookupOperationCallback plo_cb, + void *plo_cb_cls) +{ + struct TALER_MERCHANT_ProposalLookupOperation *plo; + CURL *eh; + char *nonce_str = NULL; + + plo = GNUNET_new (struct TALER_MERCHANT_ProposalLookupOperation); + plo->ctx = ctx; + plo->cb = plo_cb; + plo->cb_cls = plo_cb_cls; + if (NULL != nonce) + { + plo->has_nonce = GNUNET_YES; + plo->nonce = *nonce; + nonce_str = GNUNET_STRINGS_data_to_string_alloc ( + nonce, + sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)); + } + plo->url = TALER_url_join (backend_url, + "proposal", + "order_id", + order_id, + "nonce", + nonce_str, + NULL); + GNUNET_free_non_null (nonce_str); + if (NULL == plo->url) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Could not construct request URL.\n"); + GNUNET_free (plo); + return NULL; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "looking up proposal from %s\n", + plo->url); + eh = curl_easy_init (); + if (CURLE_OK != curl_easy_setopt (eh, + CURLOPT_URL, + plo->url)) + { + GNUNET_break (0); + curl_easy_cleanup (eh); + GNUNET_free (plo->url); + GNUNET_free (plo); + return NULL; + } + + if (NULL == (plo->job = GNUNET_CURL_job_add (ctx, + eh, + GNUNET_YES, + &handle_proposal_lookup_finished, + plo))) + { + GNUNET_break (0); + GNUNET_free (plo->url); + GNUNET_free (plo); + return NULL; + } + return plo; +} + + +/** + * Cancel a GET /proposal request. + * + * @param plo handle to the request to be canceled + */ +void +TALER_MERCHANT_proposal_lookup_cancel ( + struct TALER_MERCHANT_ProposalLookupOperation *plo) +{ + if (NULL != plo->job) + { + GNUNET_CURL_job_cancel (plo->job); + plo->job = NULL; + } + GNUNET_free (plo->url); + GNUNET_free (plo); +} + + +/* end of merchant_api_proposal_lookup.c */ |