From ee4077ef8001e0570a0333ed6b24c69eb2504760 Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Mon, 28 Mar 2022 13:19:21 +0200 Subject: starting with purse creation client API --- src/lib/exchange_api_purse_create_with_deposit.c | 410 +++++++++++++++++++++++ 1 file changed, 410 insertions(+) create mode 100644 src/lib/exchange_api_purse_create_with_deposit.c (limited to 'src/lib/exchange_api_purse_create_with_deposit.c') diff --git a/src/lib/exchange_api_purse_create_with_deposit.c b/src/lib/exchange_api_purse_create_with_deposit.c new file mode 100644 index 000000000..6765b7771 --- /dev/null +++ b/src/lib/exchange_api_purse_create_with_deposit.c @@ -0,0 +1,410 @@ +/* + This file is part of TALER + Copyright (C) 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_purse_create_with_deposit.c + * @brief Implementation of the client to create a purse with + * an initial set of deposits (and a contract) + * @author Christian Grothoff + */ +#include "platform.h" +#include +#include /* just for HTTP status codes */ +#include +#include +#include +#include "taler_json_lib.h" +#include "taler_exchange_service.h" +#include "exchange_api_handle.h" +#include "taler_signatures.h" +#include "exchange_api_curl_defaults.h" + + +/** + * @brief A purse create with deposit handle + */ +struct TALER_EXCHANGE_PurseCreateDepositHandle +{ + + /** + * The connection to exchange this request handle will use + */ + struct TALER_EXCHANGE_Handle *exchange; + + /** + * The url for this request. + */ + char *url; + + /** + * Context for #TEH_curl_easy_post(). Keeps the data that must + * persist for Curl to make the upload. + */ + struct TALER_CURL_PostContext ctx; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_EXCHANGE_PurseCreateDepositCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + +}; + + +/** + * Function called when we're done processing the + * HTTP /deposit request. + * + * @param cls the `struct TALER_EXCHANGE_DepositHandle` + * @param response_code HTTP response code, 0 on error + * @param response parsed JSON result, NULL on error + */ +static void +handle_purse_create_deposit_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_EXCHANGE_PurseCreateDepositHandle *pch = cls; + const json_t *j = response; + struct TALER_EXCHANGE_PurseCreateDepositResponse dr = { + .hr.reply = j, + .hr.http_status = (unsigned int) response_code + }; + + pch->job = NULL; + switch (response_code) + { + case 0: + dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + { + const struct TALER_EXCHANGE_Keys *key_state; + struct GNUNET_JSON_Specification spec[] = { +#if 0 + GNUNET_JSON_spec_fixed_auto ("exchange_sig", + &pch->exchange_sig), + GNUNET_JSON_spec_fixed_auto ("exchange_pub", + &pch->exchange_pub), +#endif + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (j, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + dr.hr.http_status = 0; + dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + break; + } + key_state = TALER_EXCHANGE_get_keys (pch->exchange); +#if 0 + if (GNUNET_OK != + TALER_EXCHANGE_test_signing_key (key_state, + &exchange_pub)) + { + GNUNET_break_op (0); + dr.hr.http_status = 0; + dr.hr.ec = + TALER_EC_EXCHANGE_PURSE_CREATE_WITH_DEPOSIT_INVALID_SIGNATURE_BY_EXCHANGE; + break; + } +#endif + // FIXME: validate reply... + (void) key_state; + } + 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 */ + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_FORBIDDEN: + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + /* 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: + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + break; + case MHD_HTTP_CONFLICT: + // FIXME: check reply? + break; + case MHD_HTTP_GONE: + /* could happen if denomination was revoked */ + /* Note: one might want to check /keys for revocation + signature here, alas tricky in case our /keys + is outdated => left to clients */ + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + break; + default: + /* unexpected response code */ + dr.hr.ec = TALER_JSON_get_error_code (j); + dr.hr.hint = TALER_JSON_get_error_hint (j); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d for exchange deposit\n", + (unsigned int) response_code, + dr.hr.ec); + GNUNET_break_op (0); + break; + } + pch->cb (pch->cb_cls, + &dr); + TALER_EXCHANGE_purse_create_with_deposit_cancel (pch); +} + + +struct TALER_EXCHANGE_PurseCreateDepositHandle * +TALER_EXCHANGE_purse_create_with_deposit ( + struct TALER_EXCHANGE_Handle *exchange, + const struct TALER_PurseContractPrivateKeyP *purse_priv, + const struct TALER_PurseMergePrivateKeyP *merge_priv, + const struct TALER_ContractDiffiePrivateP *contract_priv, + const json_t *contract_terms, + struct GNUNET_TIME_Timestamp purse_expiration, + unsigned int num_deposits, + const struct TALER_EXCHANGE_PurseDeposit *deposits, + TALER_EXCHANGE_PurseCreateDepositCallback cb, + void *cb_cls) +{ + struct TALER_EXCHANGE_PurseCreateDepositHandle *pch; + struct GNUNET_CURL_Context *ctx; + json_t *create_obj; + json_t *deposit_arr; + CURL *eh; + struct TALER_PurseMergePublicKeyP merge_pub; + struct TALER_PurseContractPublicKeyP purse_pub; + struct TALER_ContractDiffiePublicP contract_pub; + struct TALER_PrivateContractHashP h_contract_terms; + char arg_str[sizeof (purse_pub) * 2 + 32]; + char *url; + uint32_t min_age; + struct TALER_Amount purse_value_after_fees; + struct GNUNET_JSON_Specification spec[] = { + TALER_JSON_spec_amount_any ("amount", + &purse_value_after_fees), + GNUNET_JSON_spec_mark_optional ( + GNUNET_JSON_spec_uint32 ("minimum_age", + &min_age)), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (contract_terms, + spec, + NULL, NULL)) + { + GNUNET_break (0); + return NULL; + } + GNUNET_assert (GNUNET_YES == + TEAH_handle_is_ready (exchange)); + if (GNUNET_OK != + TALER_JSON_contract_hash (contract_terms, + &h_contract_terms)) + { + GNUNET_break (0); + return NULL; + } + GNUNET_CRYPTO_eddsa_key_get_public (&purse_priv->eddsa_priv, + &purse_pub.eddsa_pub); + { + char pub_str[sizeof (purse_pub) * 2]; + char *end; + + end = GNUNET_STRINGS_data_to_string ( + &purse_pub, + sizeof (purse_pub), + pub_str, + sizeof (pub_str)); + *end = '\0'; + GNUNET_snprintf (arg_str, + sizeof (arg_str), + "/purses/%s/create", + pub_str); + } + pch = GNUNET_new (struct TALER_EXCHANGE_PurseCreateDepositHandle); + pch->exchange = exchange; + pch->cb = cb; + pch->cb_cls = cb_cls; + GNUNET_CRYPTO_ecdhe_key_get_public (&contract_priv->ecdhe_priv, + &contract_pub.ecdhe_pub); + GNUNET_CRYPTO_eddsa_key_get_public (&merge_priv->eddsa_priv, + &merge_pub.eddsa_pub); + pch->url = TEAH_path_to_url (exchange, + arg_str); + if (NULL == pch->url) + { + GNUNET_break (0); + GNUNET_free (pch); + return NULL; + } + deposit_arr = json_array (); + GNUNET_assert (NULL != deposit_arr); + url = TEAH_path_to_url (exchange, + "/"); + for (unsigned int i = 0; iage_commitment, + &agh); + aghp = &agh; + if (GNUNET_OK != + TALER_age_commitment_attest (&deposit->age_proof, + min_age, + &attest)) + { + GNUNET_break (0); + json_decref (deposit_arr); + GNUNET_free (url); + GNUNET_free (pch); + return NULL; + } +#endif + TALER_wallet_purse_deposit_sign ( + url, + &purse_pub, + &deposit->amount, + &deposit->coin_priv, + &coin_sig); + jdeposit = GNUNET_JSON_PACK ( +#if FIXME_OEC + GNUNET_JSON_pack_allow_null ( + GNUNET_JSON_pack_data_auto ("h_age_commitment", + aghp)), + GNUNET_JSON_pack_allow_null ( + GNUNET_JSON_pack_data_auto ("age_attestation", + &attest)), +#endif + TALER_JSON_pack_amount ("amount", + &deposit->amount), + GNUNET_JSON_pack_data_auto ("denom_pub_hash", + &deposit->h_denom_pub), + TALER_JSON_pack_denom_sig ("ub_sig", + &deposit->denom_sig), + GNUNET_JSON_pack_data_auto ("coin_sig", + &coin_sig)); + GNUNET_assert (0 == + json_array_append_new (deposit_arr, + jdeposit)); + } + GNUNET_free (url); + { + void *econtract; + size_t econtract_size; + + TALER_CRYPTO_contract_encrypt_for_merge (&purse_pub, + contract_priv, + merge_priv, + contract_terms, + &econtract, + &econtract_size); + create_obj = GNUNET_JSON_PACK ( + TALER_JSON_pack_amount ("amount", + &purse_value_after_fees), + GNUNET_JSON_pack_uint64 ("min_age", + min_age), + GNUNET_JSON_pack_data_varsize ("econtract", + econtract, + econtract_size), + GNUNET_JSON_pack_data_auto ("contract_pub", + &contract_pub), + GNUNET_JSON_pack_data_auto ("merge_pub", + &merge_pub), + GNUNET_JSON_pack_data_auto ("h_contract_terms", + &h_contract_terms), + GNUNET_JSON_pack_array_steal ("deposits", + deposit_arr)); + GNUNET_free (econtract); + } + GNUNET_assert (NULL != create_obj); + eh = TALER_EXCHANGE_curl_easy_get_ (pch->url); + if ( (NULL == eh) || + (GNUNET_OK != + TALER_curl_easy_post (&pch->ctx, + eh, + create_obj)) ) + { + GNUNET_break (0); + if (NULL != eh) + curl_easy_cleanup (eh); + json_decref (create_obj); + GNUNET_free (pch->url); + GNUNET_free (pch); + return NULL; + } + json_decref (create_obj); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "URL for purse create with deposit: `%s'\n", + pch->url); + ctx = TEAH_handle_to_context (exchange); + pch->job = GNUNET_CURL_job_add2 (ctx, + eh, + pch->ctx.headers, + &handle_purse_create_deposit_finished, + pch); + return pch; +} + + +void +TALER_EXCHANGE_purse_create_with_deposit_cancel ( + struct TALER_EXCHANGE_PurseCreateDepositHandle *pch) +{ + if (NULL != pch->job) + { + GNUNET_CURL_job_cancel (pch->job); + pch->job = NULL; + } + GNUNET_free (pch->url); + TALER_curl_easy_post_finished (&pch->ctx); + GNUNET_free (pch); +} + + +/* end of exchange_api_purse_create_with_deposit.c */ -- cgit v1.2.3