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authorChristian Grothoff <christian@grothoff.org>2020-02-29 16:42:10 +0100
committerChristian Grothoff <christian@grothoff.org>2020-02-29 16:42:10 +0100
commit0a2b049864c8dae0c53c203d46fca89e0e66849d (patch)
tree3e836be37902320a4a3a099ee62d960198057952 /src/lib/exchange_api_reserve.c
parentde9ab28ab9e55597baf2ca32194ec65b441f0f36 (diff)
downloadexchange-0a2b049864c8dae0c53c203d46fca89e0e66849d.tar.gz
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big rename fest related to #6067 API renaming
Diffstat (limited to 'src/lib/exchange_api_reserve.c')
-rw-r--r--src/lib/exchange_api_reserve.c1306
1 files changed, 0 insertions, 1306 deletions
diff --git a/src/lib/exchange_api_reserve.c b/src/lib/exchange_api_reserve.c
deleted file mode 100644
index 95a4a90e..00000000
--- a/src/lib/exchange_api_reserve.c
+++ /dev/null
@@ -1,1306 +0,0 @@
-/*
- This file is part of TALER
- Copyright (C) 2014-2020 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_reserve.c
- * @brief Implementation of the /reserve requests of the exchange's HTTP API
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include <jansson.h>
-#include <microhttpd.h> /* just for HTTP status 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_handle.h"
-#include "taler_signatures.h"
-#include "exchange_api_curl_defaults.h"
-
-
-/* ********************** /reserve/status ********************** */
-
-/**
- * @brief A Withdraw Status Handle
- */
-struct TALER_EXCHANGE_ReservesGetHandle
-{
-
- /**
- * 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;
-
- /**
- * Function to call with the result.
- */
- TALER_EXCHANGE_ReservesGetCallback cb;
-
- /**
- * Public key of the reserve we are querying.
- */
- struct TALER_ReservePublicKeyP reserve_pub;
-
- /**
- * Closure for @a cb.
- */
- void *cb_cls;
-
-};
-
-
-/**
- * Parse history given in JSON format and return it in binary
- * format.
- *
- * @param exchange connection to the exchange we can use
- * @param history JSON array with the history
- * @param reserve_pub public key of the reserve to inspect
- * @param currency currency we expect the balance to be in
- * @param[out] balance final balance
- * @param history_length number of entries in @a history
- * @param[out] rhistory array of length @a history_length, set to the
- * parsed history entries
- * @return #GNUNET_OK if history was valid and @a rhistory and @a balance
- * were set,
- * #GNUNET_SYSERR if there was a protocol violation in @a history
- */
-static int
-parse_reserve_history (struct TALER_EXCHANGE_Handle *exchange,
- const json_t *history,
- const struct TALER_ReservePublicKeyP *reserve_pub,
- const char *currency,
- struct TALER_Amount *balance,
- unsigned int history_length,
- struct TALER_EXCHANGE_ReserveHistory *rhistory)
-{
- struct GNUNET_HashCode uuid[history_length];
- unsigned int uuid_off;
- struct TALER_Amount total_in;
- struct TALER_Amount total_out;
- size_t off;
-
- GNUNET_assert (GNUNET_OK ==
- TALER_amount_get_zero (currency,
- &total_in));
- GNUNET_assert (GNUNET_OK ==
- TALER_amount_get_zero (currency,
- &total_out));
- uuid_off = 0;
- for (off = 0; off<history_length; off++)
- {
- json_t *transaction;
- struct TALER_Amount amount;
- const char *type;
- struct GNUNET_JSON_Specification hist_spec[] = {
- GNUNET_JSON_spec_string ("type", &type),
- TALER_JSON_spec_amount ("amount",
- &amount),
- /* 'wire' and 'signature' are optional depending on 'type'! */
- GNUNET_JSON_spec_end ()
- };
-
- transaction = json_array_get (history,
- off);
- if (GNUNET_OK !=
- GNUNET_JSON_parse (transaction,
- hist_spec,
- NULL, NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- rhistory[off].amount = amount;
-
- if (0 == strcasecmp (type,
- "DEPOSIT"))
- {
- const char *wire_url;
- void *wire_reference;
- size_t wire_reference_size;
- struct GNUNET_TIME_Absolute timestamp;
-
- struct GNUNET_JSON_Specification withdraw_spec[] = {
- GNUNET_JSON_spec_varsize ("wire_reference",
- &wire_reference,
- &wire_reference_size),
- GNUNET_JSON_spec_absolute_time ("timestamp",
- &timestamp),
- GNUNET_JSON_spec_string ("sender_account_url",
- &wire_url),
- GNUNET_JSON_spec_end ()
- };
-
- rhistory[off].type = TALER_EXCHANGE_RTT_DEPOSIT;
- if (GNUNET_OK !=
- TALER_amount_add (&total_in,
- &total_in,
- &amount))
- {
- /* overflow in history already!? inconceivable! Bad exchange! */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- GNUNET_JSON_parse (transaction,
- withdraw_spec,
- NULL, NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- rhistory[off].details.in_details.sender_url = GNUNET_strdup (wire_url);
- rhistory[off].details.in_details.wire_reference = wire_reference;
- rhistory[off].details.in_details.wire_reference_size =
- wire_reference_size;
- rhistory[off].details.in_details.timestamp = timestamp;
- /* end type==DEPOSIT */
- }
- else if (0 == strcasecmp (type,
- "WITHDRAW"))
- {
- struct TALER_ReserveSignatureP sig;
- struct TALER_WithdrawRequestPS withdraw_purpose;
- struct GNUNET_JSON_Specification withdraw_spec[] = {
- GNUNET_JSON_spec_fixed_auto ("reserve_sig",
- &sig),
- TALER_JSON_spec_amount_nbo ("withdraw_fee",
- &withdraw_purpose.withdraw_fee),
- GNUNET_JSON_spec_fixed_auto ("h_denom_pub",
- &withdraw_purpose.h_denomination_pub),
- GNUNET_JSON_spec_fixed_auto ("h_coin_envelope",
- &withdraw_purpose.h_coin_envelope),
- GNUNET_JSON_spec_end ()
- };
-
- rhistory[off].type = TALER_EXCHANGE_RTT_WITHDRAWAL;
- if (GNUNET_OK !=
- GNUNET_JSON_parse (transaction,
- withdraw_spec,
- NULL, NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- withdraw_purpose.purpose.size
- = htonl (sizeof (withdraw_purpose));
- withdraw_purpose.purpose.purpose
- = htonl (TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW);
- withdraw_purpose.reserve_pub = *reserve_pub;
- TALER_amount_hton (&withdraw_purpose.amount_with_fee,
- &amount);
- /* Check that the signature is a valid withdraw request */
- if (GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW,
- &withdraw_purpose.purpose,
- &sig.eddsa_signature,
- &reserve_pub->eddsa_pub))
- {
- GNUNET_break_op (0);
- GNUNET_JSON_parse_free (withdraw_spec);
- return GNUNET_SYSERR;
- }
- /* check that withdraw fee matches expectations! */
- {
- const struct TALER_EXCHANGE_Keys *key_state;
- const struct TALER_EXCHANGE_DenomPublicKey *dki;
- struct TALER_Amount fee;
-
- key_state = TALER_EXCHANGE_get_keys (exchange);
- dki = TALER_EXCHANGE_get_denomination_key_by_hash (key_state,
- &withdraw_purpose.
- h_denomination_pub);
- TALER_amount_ntoh (&fee,
- &withdraw_purpose.withdraw_fee);
- if ( (GNUNET_YES !=
- TALER_amount_cmp_currency (&fee,
- &dki->fee_withdraw)) ||
- (0 !=
- TALER_amount_cmp (&fee,
- &dki->fee_withdraw)) )
- {
- GNUNET_break_op (0);
- GNUNET_JSON_parse_free (withdraw_spec);
- return GNUNET_SYSERR;
- }
- }
- rhistory[off].details.out_authorization_sig
- = json_object_get (transaction,
- "signature");
- /* Check check that the same withdraw transaction
- isn't listed twice by the exchange. We use the
- "uuid" array to remember the hashes of all
- purposes, and compare the hashes to find
- duplicates. *///
- GNUNET_CRYPTO_hash (&withdraw_purpose,
- ntohl (withdraw_purpose.purpose.size),
- &uuid[uuid_off]);
- for (unsigned int i = 0; i<uuid_off; i++)
- {
- if (0 == GNUNET_memcmp (&uuid[uuid_off],
- &uuid[i]))
- {
- GNUNET_break_op (0);
- GNUNET_JSON_parse_free (withdraw_spec);
- return GNUNET_SYSERR;
- }
- }
- uuid_off++;
-
- if (GNUNET_OK !=
- TALER_amount_add (&total_out,
- &total_out,
- &amount))
- {
- /* overflow in history already!? inconceivable! Bad exchange! */
- GNUNET_break_op (0);
- GNUNET_JSON_parse_free (withdraw_spec);
- return GNUNET_SYSERR;
- }
- /* end type==WITHDRAW */
- }
- else if (0 == strcasecmp (type,
- "RECOUP"))
- {
- struct TALER_RecoupConfirmationPS pc;
- struct GNUNET_TIME_Absolute timestamp;
- const struct TALER_EXCHANGE_Keys *key_state;
- struct GNUNET_JSON_Specification recoup_spec[] = {
- GNUNET_JSON_spec_fixed_auto ("coin_pub",
- &pc.coin_pub),
- GNUNET_JSON_spec_fixed_auto ("exchange_sig",
- &rhistory[off].details.recoup_details.
- exchange_sig),
- GNUNET_JSON_spec_fixed_auto ("exchange_pub",
- &rhistory[off].details.recoup_details.
- exchange_pub),
- GNUNET_JSON_spec_absolute_time_nbo ("timestamp",
- &pc.timestamp),
- GNUNET_JSON_spec_end ()
- };
-
- rhistory[off].type = TALER_EXCHANGE_RTT_RECOUP;
- rhistory[off].amount = amount;
- if (GNUNET_OK !=
- GNUNET_JSON_parse (transaction,
- recoup_spec,
- NULL, NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- rhistory[off].details.recoup_details.coin_pub = pc.coin_pub;
- TALER_amount_hton (&pc.recoup_amount,
- &amount);
- pc.purpose.size = htonl (sizeof (pc));
- pc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_RECOUP);
- pc.reserve_pub = *reserve_pub;
- timestamp = GNUNET_TIME_absolute_ntoh (pc.timestamp);
- rhistory[off].details.recoup_details.timestamp = timestamp;
-
- key_state = TALER_EXCHANGE_get_keys (exchange);
- if (GNUNET_OK !=
- TALER_EXCHANGE_test_signing_key (key_state,
- &rhistory[off].details.
- recoup_details.exchange_pub))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_RECOUP,
- &pc.purpose,
- &rhistory[off].details.recoup_details.
- exchange_sig.eddsa_signature,
- &rhistory[off].details.recoup_details.
- exchange_pub.eddsa_pub))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- TALER_amount_add (&total_in,
- &total_in,
- &rhistory[off].amount))
- {
- /* overflow in history already!? inconceivable! Bad exchange! */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- /* end type==RECOUP */
- }
- else if (0 == strcasecmp (type,
- "CLOSING"))
- {
- const struct TALER_EXCHANGE_Keys *key_state;
- struct TALER_ReserveCloseConfirmationPS rcc;
- struct GNUNET_TIME_Absolute timestamp;
- struct GNUNET_JSON_Specification closing_spec[] = {
- GNUNET_JSON_spec_string ("receiver_account_details",
- &rhistory[off].details.close_details.
- receiver_account_details),
- GNUNET_JSON_spec_fixed_auto ("wtid",
- &rhistory[off].details.close_details.wtid),
- GNUNET_JSON_spec_fixed_auto ("exchange_sig",
- &rhistory[off].details.close_details.
- exchange_sig),
- GNUNET_JSON_spec_fixed_auto ("exchange_pub",
- &rhistory[off].details.close_details.
- exchange_pub),
- TALER_JSON_spec_amount_nbo ("closing_fee",
- &rcc.closing_fee),
- GNUNET_JSON_spec_absolute_time_nbo ("timestamp",
- &rcc.timestamp),
- GNUNET_JSON_spec_end ()
- };
-
- rhistory[off].type = TALER_EXCHANGE_RTT_CLOSE;
- rhistory[off].amount = amount;
- if (GNUNET_OK !=
- GNUNET_JSON_parse (transaction,
- closing_spec,
- NULL, NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- TALER_amount_hton (&rcc.closing_amount,
- &amount);
- GNUNET_CRYPTO_hash (
- rhistory[off].details.close_details.receiver_account_details,
- strlen (
- rhistory[off].details.close_details.receiver_account_details) + 1,
- &rcc.h_wire);
- rcc.wtid = rhistory[off].details.close_details.wtid;
- rcc.purpose.size = htonl (sizeof (rcc));
- rcc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_RESERVE_CLOSED);
- rcc.reserve_pub = *reserve_pub;
- timestamp = GNUNET_TIME_absolute_ntoh (rcc.timestamp);
- rhistory[off].details.close_details.timestamp = timestamp;
-
- key_state = TALER_EXCHANGE_get_keys (exchange);
- if (GNUNET_OK !=
- TALER_EXCHANGE_test_signing_key (key_state,
- &rhistory[off].details.close_details.
- exchange_pub))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_RESERVE_CLOSED,
- &rcc.purpose,
- &rhistory[off].details.close_details.
- exchange_sig.eddsa_signature,
- &rhistory[off].details.close_details.
- exchange_pub.eddsa_pub))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- TALER_amount_add (&total_out,
- &total_out,
- &rhistory[off].amount))
- {
- /* overflow in history already!? inconceivable! Bad exchange! */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- /* end type==CLOSING */
- }
- else
- {
- /* unexpected 'type', protocol incompatibility, complain! */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- }
-
- /* check balance = total_in - total_out < withdraw-amount */
- if (GNUNET_SYSERR ==
- TALER_amount_subtract (balance,
- &total_in,
- &total_out))
- {
- /* total_in < total_out, why did the exchange ever allow this!? */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Free memory (potentially) allocated by #parse_reserve_history().
- *
- * @param rhistory result to free
- * @param len number of entries in @a rhistory
- */
-static void
-free_rhistory (struct TALER_EXCHANGE_ReserveHistory *rhistory,
- unsigned int len)
-{
- for (unsigned int i = 0; i<len; i++)
- {
- switch (rhistory[i].type)
- {
- case TALER_EXCHANGE_RTT_DEPOSIT:
- GNUNET_free_non_null (rhistory[i].details.in_details.wire_reference);
- GNUNET_free_non_null (rhistory[i].details.in_details.sender_url);
- break;
- case TALER_EXCHANGE_RTT_WITHDRAWAL:
- break;
- case TALER_EXCHANGE_RTT_RECOUP:
- break;
- case TALER_EXCHANGE_RTT_CLOSE:
- // should we free "receiver_account_details" ?
- break;
- }
- }
- GNUNET_free (rhistory);
-}
-
-
-/**
- * We received an #MHD_HTTP_OK status code. Handle the JSON
- * response.
- *
- * @param rsh handle of the request
- * @param j JSON response
- * @return #GNUNET_OK on success
- */
-static int
-handle_reserve_status_ok (struct TALER_EXCHANGE_ReservesGetHandle *rsh,
- const json_t *j)
-{
- json_t *history;
- unsigned int len;
- struct TALER_Amount balance;
- struct TALER_Amount balance_from_history;
- struct GNUNET_JSON_Specification spec[] = {
- TALER_JSON_spec_amount ("balance", &balance),
- GNUNET_JSON_spec_end ()
- };
-
- if (GNUNET_OK !=
- GNUNET_JSON_parse (j,
- spec,
- NULL,
- NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- history = json_object_get (j,
- "history");
- if (NULL == history)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- len = json_array_size (history);
- {
- struct TALER_EXCHANGE_ReserveHistory *rhistory;
-
- rhistory = GNUNET_new_array (len,
- struct TALER_EXCHANGE_ReserveHistory);
- if (GNUNET_OK !=
- parse_reserve_history (rsh->exchange,
- history,
- &rsh->reserve_pub,
- balance.currency,
- &balance_from_history,
- len,
- rhistory))
- {
- GNUNET_break_op (0);
- free_rhistory (rhistory,
- len);
- return GNUNET_SYSERR;
- }
- if (0 !=
- TALER_amount_cmp (&balance_from_history,
- &balance))
- {
- /* exchange cannot add up balances!? */
- GNUNET_break_op (0);
- free_rhistory (rhistory,
- len);
- return GNUNET_SYSERR;
- }
- if (NULL != rsh->cb)
- {
- rsh->cb (rsh->cb_cls,
- MHD_HTTP_OK,
- TALER_EC_NONE,
- j,
- &balance,
- len,
- rhistory);
- rsh->cb = NULL;
- }
- free_rhistory (rhistory,
- len);
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Function called when we're done processing the
- * HTTP /reserve/status request.
- *
- * @param cls the `struct TALER_EXCHANGE_ReservesGetHandle`
- * @param response_code HTTP response code, 0 on error
- * @param response parsed JSON result, NULL on error
- */
-static void
-handle_reserve_status_finished (void *cls,
- long response_code,
- const void *response)
-{
- struct TALER_EXCHANGE_ReservesGetHandle *rsh = cls;
- const json_t *j = response;
-
- rsh->job = NULL;
- switch (response_code)
- {
- case 0:
- break;
- case MHD_HTTP_OK:
- if (GNUNET_OK !=
- handle_reserve_status_ok (rsh,
- j))
- response_code = 0;
- 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 */
- break;
- case MHD_HTTP_NOT_FOUND:
- /* Nothing really to verify, this should never
- happen, we should pass the JSON reply to the application */
- break;
- case MHD_HTTP_INTERNAL_SERVER_ERROR:
- /* Server had an internal issue; we should retry, but this API
- leaves this to the application */
- break;
- default:
- /* unexpected response code */
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Unexpected response code %u\n",
- (unsigned int) response_code);
- GNUNET_break (0);
- response_code = 0;
- break;
- }
- if (NULL != rsh->cb)
- {
- rsh->cb (rsh->cb_cls,
- response_code,
- TALER_JSON_get_error_code (j),
- j,
- NULL,
- 0, NULL);
- rsh->cb = NULL;
- }
- TALER_EXCHANGE_reserves_get_cancel (rsh);
-}
-
-
-/**
- * Submit a request to obtain the transaction history of a reserve
- * from the exchange. Note that while we return the full response to the
- * caller for further processing, we do already verify that the
- * response is well-formed (i.e. that signatures included in the
- * response are all valid and add up to the balance). If the exchange's
- * reply is not well-formed, we return an HTTP status code of zero to
- * @a cb.
- *
- * @param exchange the exchange handle; the exchange must be ready to operate
- * @param reserve_pub public key of the reserve to inspect
- * @param cb the callback to call when a reply for this request is available
- * @param cb_cls closure for the above callback
- * @return a handle for this request; NULL if the inputs are invalid (i.e.
- * signatures fail to verify). In this case, the callback is not called.
- */
-struct TALER_EXCHANGE_ReservesGetHandle *
-TALER_EXCHANGE_reserves_get (struct TALER_EXCHANGE_Handle *exchange,
- const struct
- TALER_ReservePublicKeyP *reserve_pub,
- TALER_EXCHANGE_ReservesGetCallback cb,
- void *cb_cls)
-{
- struct TALER_EXCHANGE_ReservesGetHandle *rsh;
- struct GNUNET_CURL_Context *ctx;
- CURL *eh;
- char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 16];
-
- if (GNUNET_YES !=
- TEAH_handle_is_ready (exchange))
- {
- GNUNET_break (0);
- return NULL;
- }
- {
- char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
- char *end;
-
- end = GNUNET_STRINGS_data_to_string (reserve_pub,
- sizeof (struct
- TALER_ReservePublicKeyP),
- pub_str,
- sizeof (pub_str));
- *end = '\0';
- GNUNET_snprintf (arg_str,
- sizeof (arg_str),
- "/reserves/%s",
- pub_str);
- }
- rsh = GNUNET_new (struct TALER_EXCHANGE_ReservesGetHandle);
- rsh->exchange = exchange;
- rsh->cb = cb;
- rsh->cb_cls = cb_cls;
- rsh->reserve_pub = *reserve_pub;
- rsh->url = TEAH_path_to_url (exchange,
- arg_str);
- eh = TEL_curl_easy_get (rsh->url);
- ctx = TEAH_handle_to_context (exchange);
- rsh->job = GNUNET_CURL_job_add (ctx,
- eh,
- GNUNET_NO,
- &handle_reserve_status_finished,
- rsh);
- return rsh;
-}
-
-
-/**
- * Cancel a reserve status request. This function cannot be used
- * on a request handle if a response is already served for it.
- *
- * @param rsh the reserve status request handle
- */
-void
-TALER_EXCHANGE_reserves_get_cancel (struct
- TALER_EXCHANGE_ReservesGetHandle *rsh)
-{
- if (NULL != rsh->job)
- {
- GNUNET_CURL_job_cancel (rsh->job);
- rsh->job = NULL;
- }
- GNUNET_free (rsh->url);
- GNUNET_free (rsh);
-}
-
-
-/* ********************** /reserve/withdraw ********************** */
-
-/**
- * @brief A Withdraw Sign Handle
- */
-struct TALER_EXCHANGE_WithdrawHandle
-{
-
- /**
- * 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_WithdrawCallback cb;
-
- /**
- * Secrets of the planchet.
- */
- struct TALER_PlanchetSecretsP ps;
-
- /**
- * Denomination key we are withdrawing.
- */
- struct TALER_EXCHANGE_DenomPublicKey pk;
-
- /**
- * Closure for @a cb.
- */
- void *cb_cls;
-
- /**
- * Hash of the public key of the coin we are signing.
- */
- struct GNUNET_HashCode c_hash;
-
- /**
- * Public key of the reserve we are withdrawing from.
- */
- struct TALER_ReservePublicKeyP reserve_pub;
-
-};
-
-
-/**
- * We got a 200 OK response for the /reserves/$RESERVE_PUB/withdraw operation.
- * Extract the coin's signature and return it to the caller. The signature we
- * get from the exchange is for the blinded value. Thus, we first must
- * unblind it and then should verify its validity against our coin's hash.
- *
- * If everything checks out, we return the unblinded signature
- * to the application via the callback.
- *
- * @param wsh operation handle
- * @param json reply from the exchange
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on errors
- */
-static int
-reserve_withdraw_ok (struct TALER_EXCHANGE_WithdrawHandle *wsh,
- const json_t *json)
-{
- struct GNUNET_CRYPTO_RsaSignature *blind_sig;
- struct TALER_FreshCoin fc;
- struct GNUNET_JSON_Specification spec[] = {
- GNUNET_JSON_spec_rsa_signature ("ev_sig",
- &blind_sig),
- GNUNET_JSON_spec_end ()
- };
-
- if (GNUNET_OK !=
- GNUNET_JSON_parse (json,
- spec,
- NULL, NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- TALER_planchet_to_coin (&wsh->pk.key,
- blind_sig,
- &wsh->ps,
- &wsh->c_hash,
- &fc))
- {
- GNUNET_break_op (0);
- GNUNET_JSON_parse_free (spec);
- return GNUNET_SYSERR;
- }
- GNUNET_JSON_parse_free (spec);
-
- /* signature is valid, return it to the application */
- wsh->cb (wsh->cb_cls,
- MHD_HTTP_OK,
- TALER_EC_NONE,
- &fc.sig,
- json);
- /* make sure callback isn't called again after return */
- wsh->cb = NULL;
- GNUNET_CRYPTO_rsa_signature_free (fc.sig.rsa_signature);
- return GNUNET_OK;
-}
-
-
-/**
- * We got a 409 CONFLICT response for the /reserves/$RESERVE_PUB/withdraw operation.
- * Check the signatures on the withdraw transactions in the provided
- * history and that the balances add up. We don't do anything directly
- * with the information, as the JSON will be returned to the application.
- * However, our job is ensuring that the exchange followed the protocol, and
- * this in particular means checking all of the signatures in the history.
- *
- * @param wsh operation handle
- * @param json reply from the exchange
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on errors
- */
-static int
-reserve_withdraw_payment_required (struct
- TALER_EXCHANGE_WithdrawHandle *wsh,
- const json_t *json)
-{
- struct TALER_Amount balance;
- struct TALER_Amount balance_from_history;
- struct TALER_Amount requested_amount;
- json_t *history;
- size_t len;
- struct GNUNET_JSON_Specification spec[] = {
- TALER_JSON_spec_amount ("balance", &balance),
- GNUNET_JSON_spec_end ()
- };
-
- if (GNUNET_OK !=
- GNUNET_JSON_parse (json,
- spec,
- NULL, NULL))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- history = json_object_get (json,
- "history");
- if (NULL == history)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
-
- /* go over transaction history and compute
- total incoming and outgoing amounts */
- len = json_array_size (history);
- {
- struct TALER_EXCHANGE_ReserveHistory *rhistory;
-
- /* Use heap allocation as "len" may be very big and thus this may
- not fit on the stack. Use "GNUNET_malloc_large" as a malicious
- exchange may theoretically try to crash us by giving a history
- that does not fit into our memory. */
- rhistory = GNUNET_malloc_large (sizeof (struct
- TALER_EXCHANGE_ReserveHistory)
- * len);
- if (NULL == rhistory)
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
-
- if (GNUNET_OK !=
- parse_reserve_history (wsh->exchange,
- history,
- &wsh->reserve_pub,
- balance.currency,
- &balance_from_history,
- len,
- rhistory))
- {
- GNUNET_break_op (0);
- free_rhistory (rhistory,
- len);
- return GNUNET_SYSERR;
- }
- free_rhistory (rhistory,
- len);
- }
-
- if (0 !=
- TALER_amount_cmp (&balance_from_history,
- &balance))
- {
- /* exchange cannot add up balances!? */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- /* Compute how much we expected to charge to the reserve */
- if (GNUNET_OK !=
- TALER_amount_add (&requested_amount,
- &wsh->pk.value,
- &wsh->pk.fee_withdraw))
- {
- /* Overflow here? Very strange, our CPU must be fried... */
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- /* Check that funds were really insufficient */
- if (0 >= TALER_amount_cmp (&requested_amount,
- &balance))
- {
- /* Requested amount is smaller or equal to reported balance,
- so this should not have failed. */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Function called when we're done processing the
- * HTTP /reserves/$RESERVE_PUB/withdraw request.
- *
- * @param cls the `struct TALER_EXCHANGE_WithdrawHandle`
- * @param response_code HTTP response code, 0 on error
- * @param response parsed JSON result, NULL on error
- */
-static void
-handle_reserve_withdraw_finished (void *cls,
- long response_code,
- const void *response)
-{
- struct TALER_EXCHANGE_WithdrawHandle *wsh = cls;
- const json_t *j = response;
-
- wsh->job = NULL;
- switch (response_code)
- {
- case 0:
- break;
- case MHD_HTTP_OK:
- if (GNUNET_OK !=
- reserve_withdraw_ok (wsh,
- j))
- {
- GNUNET_break_op (0);
- response_code = 0;
- }
- 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 */
- break;
- case MHD_HTTP_CONFLICT:
- /* The exchange says that the reserve has insufficient funds;
- check the signatures in the history... */
- if (GNUNET_OK !=
- reserve_withdraw_payment_required (wsh,
- j))
- {
- GNUNET_break_op (0);
- response_code = 0;
- }
- break;
- case MHD_HTTP_FORBIDDEN:
- GNUNET_break (0);
- /* 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:
- /* Nothing really to verify, the exchange basically just says
- that it doesn't know this reserve. Can happen if we
- query before the wire transfer went through.
- We should simply pass the JSON reply to the application. */
- break;
- case MHD_HTTP_INTERNAL_SERVER_ERROR:
- /* Server had an internal issue; we should retry, but this API
- leaves this to the application */
- break;
- default:
- /* unexpected response code */
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Unexpected response code %u\n",
- (unsigned int) response_code);
- GNUNET_break (0);
- response_code = 0;
- break;
- }
- if (NULL != wsh->cb)
- {
- wsh->cb (wsh->cb_cls,
- response_code,
- TALER_JSON_get_error_code (j),
- NULL,
- j);
- wsh->cb = NULL;
- }
- TALER_EXCHANGE_withdraw_cancel (wsh);
-}
-
-
-/**
- * Helper function for #TALER_EXCHANGE_withdraw2() and
- * #TALER_EXCHANGE_withdraw().
- *
- * @param exchange the exchange handle; the exchange must be ready to operate
- * @param pk kind of coin to create
- * @param reserve_sig signature from the reserve authorizing the withdrawal
- * @param reserve_pub public key of the reserve to withdraw from
- * @param ps secrets of the planchet
- * caller must have committed this value to disk before the call (with @a pk)
- * @param pd planchet details matching @a ps
- * @param res_cb the callback to call when the final result for this request is available
- * @param res_cb_cls closure for @a res_cb
- * @return NULL
- * if the inputs are invalid (i.e. denomination key not with this exchange).
- * In this case, the callback is not called.
- */
-struct TALER_EXCHANGE_WithdrawHandle *
-reserve_withdraw_internal (struct TALER_EXCHANGE_Handle *exchange,
- const struct TALER_EXCHANGE_DenomPublicKey *pk,
- const struct TALER_ReserveSignatureP *reserve_sig,
- const struct TALER_ReservePublicKeyP *reserve_pub,
- const struct TALER_PlanchetSecretsP *ps,
- const struct TALER_PlanchetDetail *pd,
- TALER_EXCHANGE_WithdrawCallback res_cb,
- void *res_cb_cls)
-{
- struct TALER_EXCHANGE_WithdrawHandle *wsh;
- struct GNUNET_CURL_Context *ctx;
- json_t *withdraw_obj;
- CURL *eh;
- struct GNUNET_HashCode h_denom_pub;
- char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
-
- {
- char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
- char *end;
-
- end = GNUNET_STRINGS_data_to_string (reserve_pub,
- sizeof (struct
- TALER_ReservePublicKeyP),
- pub_str,
- sizeof (pub_str));
- *end = '\0';
- GNUNET_snprintf (arg_str,
- sizeof (arg_str),
- "/reserves/%s/withdraw",
- pub_str);
- }
- wsh = GNUNET_new (struct TALER_EXCHANGE_WithdrawHandle);
- wsh->exchange = exchange;
- wsh->cb = res_cb;
- wsh->cb_cls = res_cb_cls;
- wsh->pk = *pk;
- wsh->pk.key.rsa_public_key
- = GNUNET_CRYPTO_rsa_public_key_dup (pk->key.rsa_public_key);
- wsh->reserve_pub = *reserve_pub;
- wsh->c_hash = pd->c_hash;
- GNUNET_CRYPTO_rsa_public_key_hash (pk->key.rsa_public_key,
- &h_denom_pub);
- withdraw_obj = json_pack ("{s:o, s:o," /* denom_pub_hash and coin_ev */
- " s:o}",/* reserve_pub and reserve_sig */
- "denom_pub_hash", GNUNET_JSON_from_data_auto (
- &h_denom_pub),
- "coin_ev", GNUNET_JSON_from_data (pd->coin_ev,
- pd->coin_ev_size),
- "reserve_sig", GNUNET_JSON_from_data_auto (
- reserve_sig));
- if (NULL == withdraw_obj)
- {
- GNUNET_break (0);
- GNUNET_CRYPTO_rsa_public_key_free (wsh->pk.key.rsa_public_key);
- GNUNET_free (wsh);
- return NULL;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Attempting to withdraw from reserve %s\n",
- TALER_B2S (reserve_pub));
- wsh->ps = *ps;
- wsh->url = TEAH_path_to_url (exchange,
- arg_str);
- eh = TEL_curl_easy_get (wsh->url);
- if (GNUNET_OK !=
- TALER_curl_easy_post (&wsh->ctx,
- eh,
- withdraw_obj))
- {
- GNUNET_break (0);
- curl_easy_cleanup (eh);
- json_decref (withdraw_obj);
- GNUNET_free (wsh->url);
- GNUNET_CRYPTO_rsa_public_key_free (wsh->pk.key.rsa_public_key);
- GNUNET_free (wsh);
- return NULL;
- }
- json_decref (withdraw_obj);
- ctx = TEAH_handle_to_context (exchange);
- wsh->job = GNUNET_CURL_job_add2 (ctx,
- eh,
- wsh->ctx.headers,
- &handle_reserve_withdraw_finished,
- wsh);
- return wsh;
-}
-
-
-/**
- * Withdraw a coin from the exchange using a /reserve/withdraw request. Note
- * that to ensure that no money is lost in case of hardware failures,
- * the caller must have committed (most of) the arguments to disk
- * before calling, and be ready to repeat the request with the same
- * arguments in case of failures.
- *
- * @param exchange the exchange handle; the exchange must be ready to operate
- * @param pk kind of coin to create
- * @param reserve_priv private key of the reserve to withdraw from
- * @param ps secrets of the planchet
- * caller must have committed this value to disk before the call (with @a pk)
- * @param res_cb the callback to call when the final result for this request is available
- * @param res_cb_cls closure for the above callback
- * @return handle for the operation on success, NULL on error, i.e.
- * if the inputs are invalid (i.e. denomination key not with this exchange).
- * In this case, the callback is not called.
- */
-struct TALER_EXCHANGE_WithdrawHandle *
-TALER_EXCHANGE_withdraw (struct TALER_EXCHANGE_Handle *exchange,
- const struct TALER_EXCHANGE_DenomPublicKey *pk,
- const struct
- TALER_ReservePrivateKeyP *reserve_priv,
- const struct TALER_PlanchetSecretsP *ps,
- TALER_EXCHANGE_WithdrawCallback
- res_cb,
- void *res_cb_cls)
-{
- struct TALER_Amount amount_with_fee;
- struct TALER_ReserveSignatureP reserve_sig;
- struct TALER_WithdrawRequestPS req;
- struct TALER_PlanchetDetail pd;
- struct TALER_EXCHANGE_WithdrawHandle *wsh;
-
- GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
- &req.reserve_pub.eddsa_pub);
- req.purpose.size = htonl (sizeof (struct TALER_WithdrawRequestPS));
- req.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW);
- if (GNUNET_OK !=
- TALER_amount_add (&amount_with_fee,
- &pk->fee_withdraw,
- &pk->value))
- {
- /* exchange gave us denomination keys that overflow like this!? */
- GNUNET_break_op (0);
- return NULL;
- }
- TALER_amount_hton (&req.amount_with_fee,
- &amount_with_fee);
- TALER_amount_hton (&req.withdraw_fee,
- &pk->fee_withdraw);
- if (GNUNET_OK !=
- TALER_planchet_prepare (&pk->key,
- ps,
- &pd))
- {
- GNUNET_break_op (0);
- return NULL;
- }
- req.h_denomination_pub = pd.denom_pub_hash;
- GNUNET_CRYPTO_hash (pd.coin_ev,
- pd.coin_ev_size,
- &req.h_coin_envelope);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CRYPTO_eddsa_sign (&reserve_priv->eddsa_priv,
- &req.purpose,
- &reserve_sig.eddsa_signature));
- wsh = reserve_withdraw_internal (exchange,
- pk,
- &reserve_sig,
- &req.reserve_pub,
- ps,
- &pd,
- res_cb,
- res_cb_cls);
- GNUNET_free (pd.coin_ev);
- return wsh;
-}
-
-
-/**
- * Withdraw a coin from the exchange using a /reserve/withdraw
- * request. This API is typically used by a wallet to withdraw a tip
- * where the reserve's signature was created by the merchant already.
- *
- * Note that to ensure that no money is lost in case of hardware
- * failures, the caller must have committed (most of) the arguments to
- * disk before calling, and be ready to repeat the request with the
- * same arguments in case of failures.
- *
- * @param exchange the exchange handle; the exchange must be ready to operate
- * @param pk kind of coin to create
- * @param reserve_sig signature from the reserve authorizing the withdrawal
- * @param reserve_pub public key of the reserve to withdraw from
- * @param ps secrets of the planchet
- * caller must have committed this value to disk before the call (with @a pk)
- * @param res_cb the callback to call when the final result for this request is available
- * @param res_cb_cls closure for @a res_cb
- * @return NULL
- * if the inputs are invalid (i.e. denomination key not with this exchange).
- * In this case, the callback is not called.
- */
-struct TALER_EXCHANGE_WithdrawHandle *
-TALER_EXCHANGE_withdraw2 (struct TALER_EXCHANGE_Handle *exchange,
- const struct
- TALER_EXCHANGE_DenomPublicKey *pk,
- const struct
- TALER_ReserveSignatureP *reserve_sig,
- const struct
- TALER_ReservePublicKeyP *reserve_pub,
- const struct TALER_PlanchetSecretsP *ps,
- TALER_EXCHANGE_WithdrawCallback
- res_cb,
- void *res_cb_cls)
-{
- struct TALER_EXCHANGE_WithdrawHandle *wsh;
- struct TALER_PlanchetDetail pd;
-
- if (GNUNET_OK !=
- TALER_planchet_prepare (&pk->key,
- ps,
- &pd))
- {
- GNUNET_break_op (0);
- return NULL;
- }
- wsh = reserve_withdraw_internal (exchange,
- pk,
- reserve_sig,
- reserve_pub,
- ps,
- &pd,
- res_cb,
- res_cb_cls);
- GNUNET_free (pd.coin_ev);
- return wsh;
-}
-
-
-/**
- * Cancel a withdraw status request. This function cannot be used
- * on a request handle if a response is already served for it.
- *
- * @param sign the withdraw sign request handle
- */
-void
-TALER_EXCHANGE_withdraw_cancel (struct
- TALER_EXCHANGE_WithdrawHandle *
- sign)
-{
- if (NULL != sign->job)
- {
- GNUNET_CURL_job_cancel (sign->job);
- sign->job = NULL;
- }
- GNUNET_free (sign->url);
- TALER_curl_easy_post_finished (&sign->ctx);
- GNUNET_CRYPTO_rsa_public_key_free (sign->pk.key.rsa_public_key);
- GNUNET_free (sign);
-}
-
-
-/* end of exchange_api_reserve.c */