From f8ff9c996f2fbdde9110b473bee39ea173d2b40f Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Wed, 1 Feb 2023 17:05:11 +0100 Subject: [PATCH] add 2nd AML decision lookup API (skeleton only) --- src/lib/exchange_api_lookup_aml_decision.c | 244 ++++++++++++++++++++ src/lib/exchange_api_lookup_aml_decisions.c | 8 +- 2 files changed, 248 insertions(+), 4 deletions(-) create mode 100644 src/lib/exchange_api_lookup_aml_decision.c diff --git a/src/lib/exchange_api_lookup_aml_decision.c b/src/lib/exchange_api_lookup_aml_decision.c new file mode 100644 index 000000000..c10919165 --- /dev/null +++ b/src/lib/exchange_api_lookup_aml_decision.c @@ -0,0 +1,244 @@ +/* + This file is part of TALER + Copyright (C) 2023 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_lookup_aml_decision.c + * @brief Implementation of the /aml/$OFFICER_PUB/decision request + * @author Christian Grothoff + */ +#include "platform.h" +#include /* just for HTTP status codes */ +#include +#include +#include "taler_exchange_service.h" +#include "taler_json_lib.h" +#include "exchange_api_handle.h" +#include "taler_signatures.h" +#include "exchange_api_curl_defaults.h" + + +/** + * @brief A /coins/$COIN_PUB/link Handle + */ +struct TALER_EXCHANGE_LookupAmlDecision +{ + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_EXCHANGE_LookupAmlDecisionCallback decision_cb; + + /** + * Closure for @e cb. + */ + void *decision_cb_cls; + +}; + + +/** + * Parse the provided decision data from the "200 OK" response. + * + * @param[in,out] lh handle (callback may be zero'ed out) + * @param json json reply with the data for one coin + * @return #GNUNET_OK on success, #GNUNET_SYSERR on error + */ +static enum GNUNET_GenericReturnValue +parse_decision_ok (struct TALER_EXCHANGE_LookupAmlDecision *lh, + const json_t *json) +{ + struct TALER_EXCHANGE_AmlDecisionResponse lr = { + .hr.reply = json, + .hr.http_status = MHD_HTTP_OK + }; + int ret = GNUNET_SYSERR; + + GNUNET_break (0); // FIXME: parse response! + return ret; +} + + +/** + * Function called when we're done processing the + * HTTP /aml/$OFFICER_PUB/decision request. + * + * @param cls the `struct TALER_EXCHANGE_LookupAmlDecision` + * @param response_code HTTP response code, 0 on error + * @param response parsed JSON result, NULL on error + */ +static void +handle_lookup_finished (void *cls, + long response_code, + const void *response) +{ + struct TALER_EXCHANGE_LookupAmlDecision *lh = cls; + const json_t *j = response; + struct TALER_EXCHANGE_AmlDecisionResponse lr = { + .hr.reply = j, + .hr.http_status = (unsigned int) response_code + }; + + lh->job = NULL; + switch (response_code) + { + case 0: + lr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; + break; + case MHD_HTTP_OK: + if (GNUNET_OK != + parse_decision_ok (lh, + j)) + { + GNUNET_break_op (0); + lr.hr.http_status = 0; + lr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + break; + } + GNUNET_assert (NULL == lh->decision_cb); + TALER_EXCHANGE_link_cancel (lh); + return; + case MHD_HTTP_BAD_REQUEST: + lr.hr.ec = TALER_JSON_get_error_code (j); + lr.hr.hint = TALER_JSON_get_error_hint (j); + /* 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_NOT_FOUND: + lr.hr.ec = TALER_JSON_get_error_code (j); + lr.hr.hint = TALER_JSON_get_error_hint (j); + /* Nothing really to verify, exchange says this coin was not melted; we + should pass the JSON reply to the application */ + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + lr.hr.ec = TALER_JSON_get_error_code (j); + lr.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 */ + GNUNET_break_op (0); + lr.hr.ec = TALER_JSON_get_error_code (j); + lr.hr.hint = TALER_JSON_get_error_hint (j); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u/%d for exchange link\n", + (unsigned int) response_code, + (int) lr.hr.ec); + break; + } + if (NULL != lh->decision_cb) + lh->decision_cb (lh->decision_cb_cls, + &lr); + TALER_EXCHANGE_link_cancel (lh); +} + + +struct TALER_EXCHANGE_LookupAmlDecision * +TALER_EXCHANGE_lookup_aml_decision ( + struct GNUNET_CURL_Context *ctx, + const char *url, + const struct TALER_PaytoHashP *h_payto, + const struct TALER_AmlOfficerPrivateKeyP *officer_priv, + TALER_EXCHANGE_LookupAmlDecisionCallback cb, + void *cb_cls) +{ + struct TALER_EXCHANGE_LookupAmlDecision *lh; + CURL *eh; + struct TALER_AmlOfficerPublicKeyP officer_pub; + struct TALER_AmlOfficerSignatureP officer_sig; + char arg_str[sizeof (officer_pub) * 2 + + sizeof (*h_payto) * 2 + 32]; + + GNUNET_CRYPTO_eddsa_key_get_public (&officer_priv->eddsa_priv, + &officer_pub.eddsa_pub); + TALER_officer_aml_query_sign (officer_priv, + &officer_sig); + { + char pub_str[sizeof (officer_pub) * 2]; + char pt_str[sizeof (*h_payto) * 2]; + char *end; + + end = GNUNET_STRINGS_data_to_string ( + &officer_pub, + sizeof (officer_pub), + pub_str, + sizeof (pub_str)); + *end = '\0'; + end = GNUNET_STRINGS_data_to_string ( + h_payto, + sizeof (*h_payto), + pt_str, + sizeof (pt_str)); + *end = '\0'; + GNUNET_snprintf (arg_str, + sizeof (arg_str), + "/aml/%s/decision/%s", + pub_str, + pt_str); + } + lh = GNUNET_new (struct TALER_EXCHANGE_LookupAmlDecision); + lh->decision_cb = cb; + lh->decision_cb_cls = cb_cls; + lh->url = TALER_URL_join (exchange_url, + arg_str, + NULL); + if (NULL == lh->url) + { + GNUNET_free (lh); + return NULL; + } + eh = TALER_EXCHANGE_curl_easy_get_ (lh->url); + if (NULL == eh) + { + GNUNET_break (0); + GNUNET_free (lh->url); + GNUNET_free (lh); + return NULL; + } + // FIXME: add authorization header to 'eh' based on officer_sig! + lh->job = GNUNET_CURL_job_add_with_ct_json (ctx, + eh, + &handle_lookup_finished, + lh); + return lh; +} + + +void +TALER_EXCHANGE_lookup_aml_decision_cancel ( + struct TALER_EXCHANGE_LookupAmlDecision *lh) +{ + if (NULL != lh->job) + { + GNUNET_CURL_job_cancel (lh->job); + lh->job = NULL; + } + GNUNET_free (lh->url); + GNUNET_free (lh); +} + + +/* end of exchange_api_lookup_aml_decision.c */ diff --git a/src/lib/exchange_api_lookup_aml_decisions.c b/src/lib/exchange_api_lookup_aml_decisions.c index 50abcd6ba..00c2eaab9 100644 --- a/src/lib/exchange_api_lookup_aml_decisions.c +++ b/src/lib/exchange_api_lookup_aml_decisions.c @@ -96,7 +96,7 @@ handle_lookup_finished (void *cls, { struct TALER_EXCHANGE_LookupAmlDecisions *lh = cls; const json_t *j = response; - struct TALER_EXCHANGE_LinkResult lr = { + struct TALER_EXCHANGE_AmlDecisionsResponse lr = { .hr.reply = j, .hr.http_status = (unsigned int) response_code }; @@ -157,7 +157,7 @@ handle_lookup_finished (void *cls, struct TALER_EXCHANGE_LookupAmlDecisions * -TALER_EXCHANGE_link ( +TALER_EXCHANGE_lookup_aml_decisions ( struct GNUNET_CURL_Context *ctx, const char *url, uint64_t start, @@ -229,8 +229,8 @@ TALER_EXCHANGE_link ( void -TALER_EXCHANGE_lookup_aml_decisions (struct - TALER_EXCHANGE_LookupAmlDecisions *lh) +TALER_EXCHANGE_lookup_aml_decisions_cancel ( + struct TALER_EXCHANGE_LookupAmlDecisions *lh) { if (NULL != lh->job) {