diff options
Diffstat (limited to 'src/lib/exchange_api_lookup_aml_decisions.c')
| -rw-r--r-- | src/lib/exchange_api_lookup_aml_decisions.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/src/lib/exchange_api_lookup_aml_decisions.c b/src/lib/exchange_api_lookup_aml_decisions.c new file mode 100644 index 000000000..bb3c18b68 --- /dev/null +++ b/src/lib/exchange_api_lookup_aml_decisions.c @@ -0,0 +1,376 @@ +/* + 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 + <http://www.gnu.org/licenses/> +*/ +/** + * @file lib/exchange_api_lookup_aml_decisions.c + * @brief Implementation of the /aml/$OFFICER_PUB/decisions request + * @author Christian Grothoff + */ +#include "platform.h" +#include <microhttpd.h> /* just for HTTP status codes */ +#include <gnunet/gnunet_util_lib.h> +#include <gnunet/gnunet_curl_lib.h> +#include "taler_exchange_service.h" +#include "taler_json_lib.h" +#include "exchange_api_handle.h" +#include "taler_signatures.h" +#include "exchange_api_curl_defaults.h" + + +/** + * @brief A /coins/$COIN_PUB/link Handle + */ +struct TALER_EXCHANGE_LookupAmlDecisions +{ + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_EXCHANGE_LookupAmlDecisionsCallback decisions_cb; + + /** + * Closure for @e cb. + */ + void *decisions_cb_cls; + + /** + * HTTP headers for the job. + */ + struct curl_slist *job_headers; +}; + + +/** + * Parse AML decision summary array. + * + * @param decisions JSON array with AML decision summaries + * @param[out] decision_ar where to write the result + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +parse_aml_decisions (const json_t *decisions, + struct TALER_EXCHANGE_AmlDecisionSummary *decision_ar) +{ + json_t *obj; + size_t idx; + + json_array_foreach (decisions, idx, obj) + { + struct TALER_EXCHANGE_AmlDecisionSummary *decision = &decision_ar[idx]; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_fixed_auto ("h_payto", + &decision->h_payto), + TALER_JSON_spec_aml_decision ("current_state", + &decision->current_state), + TALER_JSON_spec_amount_any ("threshold", + &decision->threshold), + GNUNET_JSON_spec_uint64 ("rowid", + &decision->rowid), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (obj, + spec, + NULL, + NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + } + return GNUNET_OK; +} + + +/** + * 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_decisions_ok (struct TALER_EXCHANGE_LookupAmlDecisions *lh, + const json_t *json) +{ + struct TALER_EXCHANGE_AmlDecisionsResponse lr = { + .hr.reply = json, + .hr.http_status = MHD_HTTP_OK + }; + const json_t *records; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_array_const ("records", + &records), + GNUNET_JSON_spec_end () + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (json, + spec, + NULL, + NULL)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + lr.details.ok.decisions_length = json_array_size (records); + { + struct TALER_EXCHANGE_AmlDecisionSummary decisions[ + GNUNET_NZL (lr.details.ok.decisions_length)]; + enum GNUNET_GenericReturnValue ret = GNUNET_SYSERR; + + lr.details.ok.decisions = decisions; + ret = parse_aml_decisions (records, + decisions); + if (GNUNET_OK == ret) + { + lh->decisions_cb (lh->decisions_cb_cls, + &lr); + lh->decisions_cb = NULL; + } + return ret; + } +} + + +/** + * Function called when we're done processing the + * HTTP /aml/$OFFICER_PUB/decisions request. + * + * @param cls the `struct TALER_EXCHANGE_LookupAmlDecisions` + * @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_LookupAmlDecisions *lh = cls; + const json_t *j = response; + struct TALER_EXCHANGE_AmlDecisionsResponse 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_decisions_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->decisions_cb); + TALER_EXCHANGE_lookup_aml_decisions_cancel (lh); + return; + case MHD_HTTP_NO_CONTENT: + break; + 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_FORBIDDEN: + 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_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 lookup AML decisions\n", + (unsigned int) response_code, + (int) lr.hr.ec); + break; + } + if (NULL != lh->decisions_cb) + lh->decisions_cb (lh->decisions_cb_cls, + &lr); + TALER_EXCHANGE_lookup_aml_decisions_cancel (lh); +} + + +struct TALER_EXCHANGE_LookupAmlDecisions * +TALER_EXCHANGE_lookup_aml_decisions ( + struct GNUNET_CURL_Context *ctx, + const char *exchange_url, + uint64_t start, + int delta, + enum TALER_AmlDecisionState state, + const struct TALER_AmlOfficerPrivateKeyP *officer_priv, + TALER_EXCHANGE_LookupAmlDecisionsCallback cb, + void *cb_cls) +{ + struct TALER_EXCHANGE_LookupAmlDecisions *lh; + CURL *eh; + struct TALER_AmlOfficerPublicKeyP officer_pub; + struct TALER_AmlOfficerSignatureP officer_sig; + char arg_str[sizeof (struct TALER_AmlOfficerPublicKeyP) * 2 + 32]; + const char *state_str = NULL; + + switch (state) + { + case TALER_AML_NORMAL: + state_str = "normal"; + break; + case TALER_AML_PENDING: + state_str = "pending"; + break; + case TALER_AML_FROZEN: + state_str = "frozen"; + break; + } + GNUNET_assert (NULL != state_str); + 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 *end; + + end = GNUNET_STRINGS_data_to_string ( + &officer_pub, + sizeof (officer_pub), + pub_str, + sizeof (pub_str)); + *end = '\0'; + GNUNET_snprintf (arg_str, + sizeof (arg_str), + "aml/%s/decisions/%s", + pub_str, + state_str); + } + lh = GNUNET_new (struct TALER_EXCHANGE_LookupAmlDecisions); + lh->decisions_cb = cb; + lh->decisions_cb_cls = cb_cls; + { + char delta_s[24]; + char start_s[24]; + + GNUNET_snprintf (delta_s, + sizeof (delta_s), + "%d", + delta); + GNUNET_snprintf (start_s, + sizeof (start_s), + "%llu", + (unsigned long long) start); + lh->url = TALER_url_join (exchange_url, + arg_str, + "delta", + delta_s, + "start", + start_s, + 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; + } + { + char *hdr; + char sig_str[sizeof (officer_sig) * 2]; + char *end; + + end = GNUNET_STRINGS_data_to_string ( + &officer_sig, + sizeof (officer_sig), + sig_str, + sizeof (sig_str)); + *end = '\0'; + + GNUNET_asprintf (&hdr, + "%s: %s", + TALER_AML_OFFICER_SIGNATURE_HEADER, + sig_str); + lh->job_headers = curl_slist_append (NULL, + hdr); + GNUNET_free (hdr); + lh->job_headers = curl_slist_append (lh->job_headers, + "Content-type: application/json"); + lh->job = GNUNET_CURL_job_add2 (ctx, + eh, + lh->job_headers, + &handle_lookup_finished, + lh); + } + return lh; +} + + +void +TALER_EXCHANGE_lookup_aml_decisions_cancel ( + struct TALER_EXCHANGE_LookupAmlDecisions *lh) +{ + if (NULL != lh->job) + { + GNUNET_CURL_job_cancel (lh->job); + lh->job = NULL; + } + curl_slist_free_all (lh->job_headers); + GNUNET_free (lh->url); + GNUNET_free (lh); +} + + +/* end of exchange_api_lookup_aml_decisions.c */ |