From 7d8c49b3c74865331fb9d269a9efdb9ba0f52eab Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Tue, 27 Sep 2022 14:15:05 +0200 Subject: implement libtalerexchange:reserve_open API --- src/include/taler_exchange_service.h | 3 +- src/lib/Makefile.am | 1 + src/lib/exchange_api_reserves_open.c | 493 +++++++++++++++++++++++++++++++++++ 3 files changed, 495 insertions(+), 2 deletions(-) create mode 100644 src/lib/exchange_api_reserves_open.c (limited to 'src') diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h index cc19885c7..d59fcaef1 100644 --- a/src/include/taler_exchange_service.h +++ b/src/include/taler_exchange_service.h @@ -4916,7 +4916,6 @@ struct TALER_EXCHANGE_AccountMergeResponse uint64_t requirement_row; } unavailable_for_legal_reasons; - } details; }; @@ -5496,7 +5495,7 @@ TALER_EXCHANGE_reserves_attest ( /** - * Cancel a reserve status request. This function cannot be used + * Cancel a reserve attestation request. This function cannot be used * on a request handle if a response is already served for it. * * @param rah the reserve attest request handle diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am index dc08c585d..959cdc7ed 100644 --- a/src/lib/Makefile.am +++ b/src/lib/Makefile.am @@ -62,6 +62,7 @@ libtalerexchange_la_SOURCES = \ exchange_api_refund.c \ exchange_api_reserves_get.c \ exchange_api_reserves_history.c \ + exchange_api_reserves_open.c \ exchange_api_reserves_status.c \ exchange_api_transfers_get.c \ exchange_api_withdraw.c \ diff --git a/src/lib/exchange_api_reserves_open.c b/src/lib/exchange_api_reserves_open.c new file mode 100644 index 000000000..8f3fab172 --- /dev/null +++ b/src/lib/exchange_api_reserves_open.c @@ -0,0 +1,493 @@ +/* + This file is part of TALER + Copyright (C) 2014-2022 Taler Systems SA + + 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 + +*/ +/** + * @file lib/exchange_api_reserves_open.c + * @brief Implementation of the POST /reserves/$RESERVE_PUB/open requests + * @author Christian Grothoff + */ +#include "platform.h" +#include +#include /* just for HTTP open codes */ +#include +#include +#include +#include "taler_exchange_service.h" +#include "taler_json_lib.h" +#include "exchange_api_handle.h" +#include "taler_signatures.h" +#include "exchange_api_curl_defaults.h" + + +/** + * @brief A /reserves/$RID/open Handle + */ +struct TALER_EXCHANGE_ReservesOpenHandle +{ + + /** + * The connection to exchange this request handle will use + */ + struct TALER_EXCHANGE_Handle *exchange; + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Context for #TEH_curl_easy_post(). Keeps the data that must + * persist for Curl to make the upload. + */ + struct TALER_CURL_PostContext post_ctx; + + /** + * Function to call with the result. + */ + TALER_EXCHANGE_ReservesOpenCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Public key of the reserve we are querying. + */ + struct TALER_ReservePublicKeyP reserve_pub; + + /** + * Our signature. + */ + struct TALER_ReserveSignatureP reserve_sig; + + /** + * When did we make the request. + */ + struct GNUNET_TIME_Timestamp ts; + +}; + + +/** + * We received an #MHD_HTTP_OK open code. Handle the JSON + * response. + * + * @param roh handle of the request + * @param j JSON response + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_reserves_open_ok (struct TALER_EXCHANGE_ReservesOpenHandle *roh, + const json_t *j) +{ + struct TALER_EXCHANGE_ReserveOpenResult rs = { + .hr.reply = j, + .hr.http_status = MHD_HTTP_OK, + }; + struct GNUNET_JSON_Specification spec[] = { + TALER_JSON_spec_amount_any ("open_cost", + &rs.details.ok.open_cost), + GNUNET_JSON_spec_timestamp ("reserve_expiration", + &rs.details.ok.expiration_time), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (j, + spec, + NULL, + NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + roh->cb (roh->cb_cls, + &rs); + roh->cb = NULL; + GNUNET_JSON_parse_free (spec); + return GNUNET_OK; +} + + +/** + * We received an #MHD_HTTP_PAYMENT_REQUIRED open code. Handle the JSON + * response. + * + * @param roh handle of the request + * @param j JSON response + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_reserves_open_pr (struct TALER_EXCHANGE_ReservesOpenHandle *roh, + const json_t *j) +{ + struct TALER_EXCHANGE_ReserveOpenResult rs = { + .hr.reply = j, + .hr.http_status = MHD_HTTP_PAYMENT_REQUIRED, + }; + struct GNUNET_JSON_Specification spec[] = { + TALER_JSON_spec_amount_any ("open_cost", + &rs.details.payment_required.open_cost), + GNUNET_JSON_spec_timestamp ("reserve_expiration", + &rs.details.payment_required.expiration_time), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (j, + spec, + NULL, + NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + roh->cb (roh->cb_cls, + &rs); + roh->cb = NULL; + GNUNET_JSON_parse_free (spec); + return GNUNET_OK; +} + + +/** + * We received an #MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS open code. Handle the JSON + * response. + * + * @param roh handle of the request + * @param j JSON response + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_reserves_open_kyc (struct TALER_EXCHANGE_ReservesOpenHandle *roh, + const json_t *j) +{ + struct TALER_EXCHANGE_ReserveOpenResult rs = { + .hr.reply = j, + .hr.http_status = MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS, + }; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_fixed_auto ( + "h_payto", + &rs.details.unavailable_for_legal_reasons.h_payto), + GNUNET_JSON_spec_uint64 ( + "requirement_row", + &rs.details.unavailable_for_legal_reasons.requirement_row), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (j, + spec, + NULL, + NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + roh->cb (roh->cb_cls, + &rs); + roh->cb = NULL; + GNUNET_JSON_parse_free (spec); + return GNUNET_OK; +} + + +/** + * Function called when we're done processing the + * HTTP /reserves/$RID/open request. + * + * @param cls the `struct TALER_EXCHANGE_ReservesOpenHandle` + * @param response_code HTTP response code, 0 on error + * @param response parsed JSON result, NULL on error + */ +static void +handle_reserves_open_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_EXCHANGE_ReservesOpenHandle *roh = cls; + const json_t *j = response; + struct TALER_EXCHANGE_ReserveOpenResult rs = { + .hr.reply = j, + .hr.http_status = (unsigned int) response_code + }; + + roh->job = NULL; + switch (response_code) + { + case 0: + rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + if (GNUNET_OK != + handle_reserves_open_ok (roh, + j)) + { + GNUNET_break_op (0); + rs.hr.http_status = 0; + rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + } + 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 */ + GNUNET_break (0); + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_PAYMENT_REQUIRED: + if (GNUNET_OK != + handle_reserves_open_pr (roh, + j)) + { + GNUNET_break_op (0); + rs.hr.http_status = 0; + rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + } + break; + case MHD_HTTP_FORBIDDEN: + /* This should never happen, either us or the exchange is buggy + (or API version conflict); just pass JSON reply to the application */ + GNUNET_break (0); + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_NOT_FOUND: + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS: + if (GNUNET_OK != + handle_reserves_open_kyc (roh, + j)) + { + GNUNET_break_op (0); + rs.hr.http_status = 0; + rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + } + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + break; + default: + /* unexpected response code */ + GNUNET_break_op (0); + rs.hr.ec = TALER_JSON_get_error_code (j); + rs.hr.hint = TALER_JSON_get_error_hint (j); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d for reserves open\n", + (unsigned int) response_code, + (int) rs.hr.ec); + break; + } + if (NULL != roh->cb) + { + roh->cb (roh->cb_cls, + &rs); + roh->cb = NULL; + } + TALER_EXCHANGE_reserves_open_cancel (roh); +} + + +struct TALER_EXCHANGE_ReservesOpenHandle * +TALER_EXCHANGE_reserves_open ( + struct TALER_EXCHANGE_Handle *exchange, + const struct TALER_ReservePrivateKeyP *reserve_priv, + const struct TALER_Amount *reserve_contribution, + unsigned int coin_payments_length, + const struct TALER_EXCHANGE_PurseDeposit *coin_payments, + struct GNUNET_TIME_Timestamp expiration_time, + uint32_t min_purses, + TALER_EXCHANGE_ReservesOpenCallback cb, + void *cb_cls) +{ + struct TALER_EXCHANGE_ReservesOpenHandle *roh; + struct GNUNET_CURL_Context *ctx; + CURL *eh; + char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32]; + const struct TALER_EXCHANGE_Keys *keys; + json_t *cpa; + + if (GNUNET_YES != + TEAH_handle_is_ready (exchange)) + { + GNUNET_break (0); + return NULL; + } + roh = GNUNET_new (struct TALER_EXCHANGE_ReservesOpenHandle); + roh->exchange = exchange; + roh->cb = cb; + roh->cb_cls = cb_cls; + roh->ts = GNUNET_TIME_timestamp_get (); + GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv, + &roh->reserve_pub.eddsa_pub); + { + char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2]; + char *end; + + end = GNUNET_STRINGS_data_to_string ( + &roh->reserve_pub, + sizeof (roh->reserve_pub), + pub_str, + sizeof (pub_str)); + *end = '\0'; + GNUNET_snprintf (arg_str, + sizeof (arg_str), + "/reserves/%s/open", + pub_str); + } + roh->url = TEAH_path_to_url (exchange, + arg_str); + if (NULL == roh->url) + { + GNUNET_free (roh); + return NULL; + } + eh = TALER_EXCHANGE_curl_easy_get_ (roh->url); + if (NULL == eh) + { + GNUNET_break (0); + GNUNET_free (roh->url); + GNUNET_free (roh); + return NULL; + } + keys = TALER_EXCHANGE_get_keys (exchange); + if (NULL == keys) + { + GNUNET_break (0); + curl_easy_cleanup (eh); + GNUNET_free (roh->url); + GNUNET_free (roh); + return NULL; + } + cpa = json_array (); + GNUNET_assert (NULL != cpa); + for (unsigned int i = 0; iage_commitment_proof; + struct TALER_AgeCommitmentHash ahac; + struct TALER_AgeCommitmentHash *achp = NULL; + json_t *cp; + + if (NULL != acp) + { + TALER_age_commitment_hash (&acp->commitment, + &ahac); + achp = &ahac; + } + TALER_wallet_reserve_open_deposit_sign (&pd->amount, + &roh->reserve_pub, + roh->ts, + &pd->coin_priv, + &coin_sig); + GNUNET_CRYPTO_eddsa_key_get_public (&pd->coin_priv.eddsa_priv, + &coin_pub.eddsa_pub); + + cp = GNUNET_JSON_PACK ( + GNUNET_JSON_pack_allow_null ( + GNUNET_JSON_pack_data_auto ("h_age_commitment", + achp)), + TALER_JSON_pack_amount ("amount", + &pd->amount), + GNUNET_JSON_pack_data_auto ("denom_pub_hash", + &pd->h_denom_pub), + TALER_JSON_pack_denom_sig ("ub_sig", + &pd->denom_sig), + GNUNET_JSON_pack_data_auto ("coin_pub", + &coin_pub), + GNUNET_JSON_pack_data_auto ("coin_sig", + &coin_sig)); + GNUNET_assert (0 == + json_array_append_new (cpa, + cp)); + } + TALER_wallet_reserve_open_sign (reserve_contribution, + roh->ts, + expiration_time, + min_purses, + reserve_priv, + &roh->reserve_sig); + { + json_t *open_obj = GNUNET_JSON_PACK ( + GNUNET_JSON_pack_timestamp ("request_timestamp", + roh->ts), + GNUNET_JSON_pack_timestamp ("reserve_expiration", + expiration_time), + GNUNET_JSON_pack_array_steal ("payments", + cpa), + TALER_JSON_pack_amount ("reserve_payment", + reserve_contribution), + GNUNET_JSON_pack_uint64 ("min_purses", + min_purses), + GNUNET_JSON_pack_data_auto ("reserve_sig", + &roh->reserve_sig)); + + if (GNUNET_OK != + TALER_curl_easy_post (&roh->post_ctx, + eh, + open_obj)) + { + GNUNET_break (0); + curl_easy_cleanup (eh); + json_decref (open_obj); + GNUNET_free (roh->url); + GNUNET_free (roh); + return NULL; + } + json_decref (open_obj); + } + ctx = TEAH_handle_to_context (exchange); + roh->job = GNUNET_CURL_job_add2 (ctx, + eh, + roh->post_ctx.headers, + &handle_reserves_open_finished, + roh); + return roh; +} + + +void +TALER_EXCHANGE_reserves_open_cancel ( + struct TALER_EXCHANGE_ReservesOpenHandle *roh) +{ + if (NULL != roh->job) + { + GNUNET_CURL_job_cancel (roh->job); + roh->job = NULL; + } + TALER_curl_easy_post_finished (&roh->post_ctx); + GNUNET_free (roh->url); + GNUNET_free (roh); +} + + +/* end of exchange_api_reserves_open.c */ -- cgit v1.2.3