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Diffstat (limited to 'src/exchange-lib/exchange_api_refund.c')
| -rw-r--r-- | src/exchange-lib/exchange_api_refund.c | 416 |
1 files changed, 0 insertions, 416 deletions
diff --git a/src/exchange-lib/exchange_api_refund.c b/src/exchange-lib/exchange_api_refund.c deleted file mode 100644 index 447e9ce08..000000000 --- a/src/exchange-lib/exchange_api_refund.c +++ /dev/null @@ -1,416 +0,0 @@ -/* - This file is part of TALER - Copyright (C) 2014, 2015, 2016 GNUnet e.V. - - TALER is free software; you can redistribute it and/or modify it under the - terms of the GNU General Public License as published by the Free Software - Foundation; either version 3, 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 General Public License for more details. - - You should have received a copy of the GNU General Public License along with - TALER; see the file COPYING. If not, see - <http://www.gnu.org/licenses/> -*/ -/** - * @file exchange-lib/exchange_api_refund.c - * @brief Implementation of the /refund request of the exchange's HTTP API - * @author Christian Grothoff - */ -#include "platform.h" -#include <jansson.h> -#include <microhttpd.h> /* just for HTTP status codes */ -#include <gnunet/gnunet_util_lib.h> -#include <gnunet/gnunet_json_lib.h> -#include <gnunet/gnunet_curl_lib.h> -#include "taler_json_lib.h" -#include "taler_exchange_service.h" -#include "exchange_api_handle.h" -#include "taler_signatures.h" -#include "curl_defaults.h" - - -/** - * @brief A Refund Handle - */ -struct TALER_EXCHANGE_RefundHandle -{ - - /** - * The connection to exchange this request handle will use - */ - struct TALER_EXCHANGE_Handle *exchange; - - /** - * The url for this request. - */ - char *url; - - /** - * JSON encoding of the request to POST. - */ - char *json_enc; - - /** - * Handle for the request. - */ - struct GNUNET_CURL_Job *job; - - /** - * Function to call with the result. - */ - TALER_EXCHANGE_RefundResultCallback cb; - - /** - * Closure for @a cb. - */ - void *cb_cls; - - /** - * Information the exchange should sign in response. - */ - struct TALER_RefundConfirmationPS depconf; - -}; - - -/** - * Verify that the signature on the "200 OK" response - * from the exchange is valid. - * - * @param rh refund handle - * @param json json reply with the signature - * @param[out] exchange_pub set to the exchange's public key - * @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not - */ -static int -verify_refund_signature_ok (const struct TALER_EXCHANGE_RefundHandle *rh, - const json_t *json, - struct TALER_ExchangePublicKeyP *exchange_pub) -{ - struct TALER_ExchangeSignatureP exchange_sig; - const struct TALER_EXCHANGE_Keys *key_state; - struct GNUNET_JSON_Specification spec[] = { - GNUNET_JSON_spec_fixed_auto ("sig", &exchange_sig), - GNUNET_JSON_spec_fixed_auto ("pub", exchange_pub), - GNUNET_JSON_spec_end() - }; - - if (GNUNET_OK != - GNUNET_JSON_parse (json, - spec, - NULL, NULL)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - key_state = TALER_EXCHANGE_get_keys (rh->exchange); - if (GNUNET_OK != - TALER_EXCHANGE_test_signing_key (key_state, - exchange_pub)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - if (GNUNET_OK != - GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_REFUND, - &rh->depconf.purpose, - &exchange_sig.eddsa_signature, - &exchange_pub->eddsa_pub)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return GNUNET_OK; -} - - -/** - * Function called when we're done processing the - * HTTP /refund request. - * - * @param cls the `struct TALER_EXCHANGE_RefundHandle` - * @param response_code HTTP response code, 0 on error - * @param response parsed JSON result, NULL on error - */ -static void -handle_refund_finished (void *cls, - long response_code, - const void *response) -{ - struct TALER_EXCHANGE_RefundHandle *rh = cls; - struct TALER_ExchangePublicKeyP exchange_pub; - struct TALER_ExchangePublicKeyP *ep = NULL; - const json_t *j = response; - - rh->job = NULL; - switch (response_code) - { - case 0: - break; - case MHD_HTTP_OK: - if (GNUNET_OK != - verify_refund_signature_ok (rh, - j, - &exchange_pub)) - { - GNUNET_break_op (0); - response_code = 0; - } - else - { - ep = &exchange_pub; - } - break; - case MHD_HTTP_BAD_REQUEST: - /* This should never happen, either us or the exchange is buggy - (or API version conflict); just pass JSON reply to the application */ - break; - case MHD_HTTP_UNAUTHORIZED: - /* Nothing really to verify, exchange says one of the signatures is - invalid; as we checked them, this should never happen, we - should pass the JSON reply to the application */ - break; - case MHD_HTTP_NOT_FOUND: - /* Nothing really to verify, this should never - happen, we should pass the JSON reply to the application */ - break; - case MHD_HTTP_GONE: - /* Kind of normal: the money was already sent to the merchant - (it was too late for the refund). */ - break; - case MHD_HTTP_PRECONDITION_FAILED: - /* Client request was inconsistent; might be a currency missmatch - problem. */ - break; - case MHD_HTTP_CONFLICT: - /* Two refund requests were made about the same deposit, but - carrying different refund transaction ids. */ - 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; - } - rh->cb (rh->cb_cls, - response_code, - TALER_JSON_get_error_code (j), - ep, - j); - TALER_EXCHANGE_refund_cancel (rh); -} - - -/** - * Submit a refund request to the exchange and get the exchange's - * response. This API is used by a merchant. Note that - * while we return the response verbatim to the caller for further - * processing, we do already verify that the response is well-formed - * (i.e. that signatures included in the response are all valid). If - * the exchange's reply is not well-formed, we return an HTTP status code - * of zero to @a cb. - * - * The @a exchange must be ready to operate (i.e. have - * finished processing the /keys reply). If this check fails, we do - * NOT initiate the transaction with the exchange and instead return NULL. - * - * @param exchange the exchange handle; the exchange must be ready to operate - * @param amount the amount to be refunded; must be larger than the refund fee - * (as that fee is still being subtracted), and smaller than the amount - * (with deposit fee) of the original deposit contribution of this coin - * @param refund_fee fee applicable to this coin for the refund - * @param h_contract_terms hash of the contact of the merchant with the customer that is being refunded - * @param coin_pub coin’s public key of the coin from the original deposit operation - * @param rtransaction_id transaction id for the transaction between merchant and customer (of refunding operation); - * this is needed as we may first do a partial refund and later a full refund. If both - * refunds are also over the same amount, we need the @a rtransaction_id to make the disjoint - * refund requests different (as requests are idempotent and otherwise the 2nd refund might not work). - * @param merchant_priv the private key of the merchant, used to generate signature for refund request - * @param cb the callback to call when a reply for this request is available - * @param cb_cls closure for the above callback - * @return a handle for this request; NULL if the inputs are invalid (i.e. - * signatures fail to verify). In this case, the callback is not called. - */ -struct TALER_EXCHANGE_RefundHandle * -TALER_EXCHANGE_refund (struct TALER_EXCHANGE_Handle *exchange, - const struct TALER_Amount *amount, - const struct TALER_Amount *refund_fee, - const struct GNUNET_HashCode *h_contract_terms, - const struct TALER_CoinSpendPublicKeyP *coin_pub, - uint64_t rtransaction_id, - const struct TALER_MerchantPrivateKeyP *merchant_priv, - TALER_EXCHANGE_RefundResultCallback cb, - void *cb_cls) -{ - struct TALER_RefundRequestPS rr; - struct TALER_MerchantSignatureP merchant_sig; - - GNUNET_assert (GNUNET_YES == - TEAH_handle_is_ready (exchange)); - rr.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_REFUND); - rr.purpose.size = htonl (sizeof (struct TALER_RefundRequestPS)); - rr.h_contract_terms = *h_contract_terms; - rr.coin_pub = *coin_pub; - GNUNET_CRYPTO_eddsa_key_get_public (&merchant_priv->eddsa_priv, - &rr.merchant.eddsa_pub); - rr.rtransaction_id = GNUNET_htonll (rtransaction_id); - TALER_amount_hton (&rr.refund_amount, - amount); - TALER_amount_hton (&rr.refund_fee, - refund_fee); - GNUNET_assert (GNUNET_OK == - GNUNET_CRYPTO_eddsa_sign (&merchant_priv->eddsa_priv, - &rr.purpose, - &merchant_sig.eddsa_sig)); - return TALER_EXCHANGE_refund2 (exchange, - amount, - refund_fee, - h_contract_terms, - coin_pub, - rtransaction_id, - &rr.merchant, - &merchant_sig, - cb, - cb_cls); -} - - -/** - * Submit a refund request to the exchange and get the exchange's - * response. This API is used by a merchant. Note that - * while we return the response verbatim to the caller for further - * processing, we do already verify that the response is well-formed - * (i.e. that signatures included in the response are all valid). If - * the exchange's reply is not well-formed, we return an HTTP status code - * of zero to @a cb. - * - * The @a exchange must be ready to operate (i.e. have - * finished processing the /keys reply). If this check fails, we do - * NOT initiate the transaction with the exchange and instead return NULL. - * - * @param exchange the exchange handle; the exchange must be ready to operate - * @param amount the amount to be refunded; must be larger than the refund fee - * (as that fee is still being subtracted), and smaller than the amount - * (with deposit fee) of the original deposit contribution of this coin - * @param refund_fee fee applicable to this coin for the refund - * @param h_contract_terms hash of the contact of the merchant with the customer that is being refunded - * @param coin_pub coin’s public key of the coin from the original deposit operation - * @param rtransaction_id transaction id for the transaction between merchant and customer (of refunding operation); - * this is needed as we may first do a partial refund and later a full refund. If both - * refunds are also over the same amount, we need the @a rtransaction_id to make the disjoint - * refund requests different (as requests are idempotent and otherwise the 2nd refund might not work). - * @param merchant_pub public key of the merchant - * @param merchant_sig signature affirming the refund from the merchant - * @param cb the callback to call when a reply for this request is available - * @param cb_cls closure for the above callback - * @return a handle for this request; NULL if the inputs are invalid (i.e. - * signatures fail to verify). In this case, the callback is not called. - */ -struct TALER_EXCHANGE_RefundHandle * -TALER_EXCHANGE_refund2 (struct TALER_EXCHANGE_Handle *exchange, - const struct TALER_Amount *amount, - const struct TALER_Amount *refund_fee, - const struct GNUNET_HashCode *h_contract_terms, - const struct TALER_CoinSpendPublicKeyP *coin_pub, - uint64_t rtransaction_id, - const struct TALER_MerchantPublicKeyP *merchant_pub, - const struct TALER_MerchantSignatureP *merchant_sig, - TALER_EXCHANGE_RefundResultCallback cb, - void *cb_cls) -{ - struct TALER_EXCHANGE_RefundHandle *rh; - struct GNUNET_CURL_Context *ctx; - json_t *refund_obj; - CURL *eh; - -refund_obj = json_pack ("{s:o, s:o," /* amount/fee */ - " s:o, s:o," /* h_contract_terms, coin_pub */ - " s:I," /* rtransaction id */ - " s:o, s:o}", /* merchant_pub, merchant_sig */ - "refund_amount", TALER_JSON_from_amount (amount), - "refund_fee", TALER_JSON_from_amount (refund_fee), - "h_contract_terms", GNUNET_JSON_from_data_auto (h_contract_terms), - "coin_pub", GNUNET_JSON_from_data_auto (coin_pub), - "rtransaction_id", (json_int_t) rtransaction_id, - "merchant_pub", GNUNET_JSON_from_data_auto (merchant_pub), - "merchant_sig", GNUNET_JSON_from_data_auto (merchant_sig) - ); - if (NULL == refund_obj) - { - GNUNET_break (0); - return NULL; - } - - rh = GNUNET_new (struct TALER_EXCHANGE_RefundHandle); - rh->exchange = exchange; - rh->cb = cb; - rh->cb_cls = cb_cls; - rh->url = TEAH_path_to_url (exchange, "/refund"); - rh->depconf.purpose.size = htonl (sizeof (struct TALER_RefundConfirmationPS)); - rh->depconf.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_REFUND); - rh->depconf.h_contract_terms = *h_contract_terms; - rh->depconf.coin_pub = *coin_pub; - rh->depconf.merchant = *merchant_pub; - rh->depconf.rtransaction_id = GNUNET_htonll (rtransaction_id); - TALER_amount_hton (&rh->depconf.refund_amount, - amount); - TALER_amount_hton (&rh->depconf.refund_fee, - refund_fee); - - eh = TEL_curl_easy_get (rh->url); - GNUNET_assert (NULL != (rh->json_enc = - json_dumps (refund_obj, - JSON_COMPACT))); - json_decref (refund_obj); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "URL for refund: `%s'\n", - rh->url); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_POSTFIELDS, - rh->json_enc)); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_POSTFIELDSIZE, - strlen (rh->json_enc))); - ctx = TEAH_handle_to_context (exchange); - rh->job = GNUNET_CURL_job_add (ctx, - eh, - GNUNET_YES, - &handle_refund_finished, - rh); - return rh; -} - - -/** - * Cancel a refund permission request. This function cannot be used - * on a request handle if a response is already served for it. - * - * @param refund the refund permission request handle - */ -void -TALER_EXCHANGE_refund_cancel (struct TALER_EXCHANGE_RefundHandle *refund) -{ - if (NULL != refund->job) - { - GNUNET_CURL_job_cancel (refund->job); - refund->job = NULL; - } - GNUNET_free (refund->url); - GNUNET_free (refund->json_enc); - GNUNET_free (refund); -} - - -/* end of exchange_api_refund.c */ |