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Diffstat (limited to 'src/lib/exchange_api_reserves_open.c')
-rw-r--r--src/lib/exchange_api_reserves_open.c567
1 files changed, 567 insertions, 0 deletions
diff --git a/src/lib/exchange_api_reserves_open.c b/src/lib/exchange_api_reserves_open.c
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index 000000000..36e435685
--- /dev/null
+++ b/src/lib/exchange_api_reserves_open.c
@@ -0,0 +1,567 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014-2023 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_reserves_open.c
+ * @brief Implementation of the POST /reserves/$RESERVE_PUB/open requests
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP open codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_exchange_service.h"
+#include "taler_json_lib.h"
+#include "exchange_api_common.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * Information we keep per coin to validate the reply.
+ */
+struct CoinData
+{
+ /**
+ * Public key of the coin.
+ */
+ struct TALER_CoinSpendPublicKeyP coin_pub;
+
+ /**
+ * Signature by the coin.
+ */
+ struct TALER_CoinSpendSignatureP coin_sig;
+
+ /**
+ * The hash of the denomination's public key
+ */
+ struct TALER_DenominationHashP h_denom_pub;
+
+ /**
+ * How much did this coin contribute.
+ */
+ struct TALER_Amount contribution;
+};
+
+
+/**
+ * @brief A /reserves/$RID/open Handle
+ */
+struct TALER_EXCHANGE_ReservesOpenHandle
+{
+
+ /**
+ * The keys of the exchange this request handle will use
+ */
+ struct TALER_EXCHANGE_Keys *keys;
+
+ /**
+ * 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;
+
+ /**
+ * Information we keep per coin to validate the reply.
+ */
+ struct CoinData *coins;
+
+ /**
+ * Length of the @e coins array.
+ */
+ unsigned int num_coins;
+
+ /**
+ * 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);
+ json_dumpf (j,
+ stderr,
+ JSON_INDENT (2));
+ 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_CONFLICT:
+ {
+ const struct CoinData *cd = NULL;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto ("coin_pub",
+ &rs.details.conflict.coin_pub),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL,
+ NULL))
+ {
+ GNUNET_break_op (0);
+ rs.hr.http_status = 0;
+ rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+ break;
+ }
+ for (unsigned int i = 0; i<roh->num_coins; i++)
+ {
+ const struct CoinData *cdi = &roh->coins[i];
+
+ if (0 == GNUNET_memcmp (&rs.details.conflict.coin_pub,
+ &cdi->coin_pub))
+ {
+ cd = cdi;
+ break;
+ }
+ }
+ if (NULL == cd)
+ {
+ GNUNET_break_op (0);
+ rs.hr.http_status = 0;
+ rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+ break;
+ }
+ 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 GNUNET_CURL_Context *ctx,
+ const char *url,
+ struct TALER_EXCHANGE_Keys *keys,
+ const struct TALER_ReservePrivateKeyP *reserve_priv,
+ const struct TALER_Amount *reserve_contribution,
+ unsigned int coin_payments_length,
+ const struct TALER_EXCHANGE_PurseDeposit coin_payments[
+ static coin_payments_length],
+ struct GNUNET_TIME_Timestamp expiration_time,
+ uint32_t min_purses,
+ TALER_EXCHANGE_ReservesOpenCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_ReservesOpenHandle *roh;
+ CURL *eh;
+ char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
+ json_t *cpa;
+
+ roh = GNUNET_new (struct TALER_EXCHANGE_ReservesOpenHandle);
+ 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 = TALER_url_join (url,
+ arg_str,
+ NULL);
+ 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;
+ }
+ TALER_wallet_reserve_open_sign (reserve_contribution,
+ roh->ts,
+ expiration_time,
+ min_purses,
+ reserve_priv,
+ &roh->reserve_sig);
+ roh->coins = GNUNET_new_array (coin_payments_length,
+ struct CoinData);
+ cpa = json_array ();
+ GNUNET_assert (NULL != cpa);
+ for (unsigned int i = 0; i<coin_payments_length; i++)
+ {
+ const struct TALER_EXCHANGE_PurseDeposit *pd = &coin_payments[i];
+ const struct TALER_AgeCommitmentProof *acp = pd->age_commitment_proof;
+ struct TALER_AgeCommitmentHash ahac;
+ struct TALER_AgeCommitmentHash *achp = NULL;
+ struct CoinData *cd = &roh->coins[i];
+ json_t *cp;
+
+ cd->contribution = pd->amount;
+ cd->h_denom_pub = pd->h_denom_pub;
+ if (NULL != acp)
+ {
+ TALER_age_commitment_hash (&acp->commitment,
+ &ahac);
+ achp = &ahac;
+ }
+ TALER_wallet_reserve_open_deposit_sign (&pd->amount,
+ &roh->reserve_sig,
+ &pd->coin_priv,
+ &cd->coin_sig);
+ GNUNET_CRYPTO_eddsa_key_get_public (&pd->coin_priv.eddsa_priv,
+ &cd->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",
+ &cd->coin_pub),
+ GNUNET_JSON_pack_data_auto ("coin_sig",
+ &cd->coin_sig));
+ GNUNET_assert (0 ==
+ json_array_append_new (cpa,
+ cp));
+ }
+ {
+ 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 ("purse_limit",
+ 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->coins);
+ GNUNET_free (roh->url);
+ GNUNET_free (roh);
+ return NULL;
+ }
+ json_decref (open_obj);
+ }
+ roh->keys = TALER_EXCHANGE_keys_incref (keys);
+ 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->coins);
+ GNUNET_free (roh->url);
+ TALER_EXCHANGE_keys_decref (roh->keys);
+ GNUNET_free (roh);
+}
+
+
+/* end of exchange_api_reserves_open.c */