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-draft implementation of /purses//merge endpoint

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This commit is contained in:
Christian Grothoff 2022-04-11 13:52:06 +02:00
parent f9971faa7a
commit 72dd9514aa
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GPG Key ID: 939E6BE1E29FC3CC
13 changed files with 709 additions and 38 deletions
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2
contrib/gana

@ -1 +1 @@
Subproject commit 313216ee11fe604d39ea5f1b71b1ad96a60391d9
Subproject commit 702e3252edc8a0fc9bf59d35bf66470342061493

1
src/exchange/Makefile.am
View File

@ -104,6 +104,7 @@ taler_exchange_httpd_SOURCES = \
taler-exchange-httpd_metrics.c taler-exchange-httpd_metrics.h \
taler-exchange-httpd_mhd.c taler-exchange-httpd_mhd.h \
taler-exchange-httpd_purses_create.c taler-exchange-httpd_purses_create.h \
taler-exchange-httpd_purses_merge.c taler-exchange-httpd_purses_merge.h \
taler-exchange-httpd_recoup.c taler-exchange-httpd_recoup.h \
taler-exchange-httpd_recoup-refresh.c taler-exchange-httpd_recoup-refresh.h \
taler-exchange-httpd_refreshes_reveal.c taler-exchange-httpd_refreshes_reveal.h \

4
src/exchange/taler-exchange-httpd_keys.h
View File

@ -318,8 +318,8 @@ TEH_keys_denomination_cs_r_pub_melt (
* @param h_denom_pub hash of the public key to revoke
*/
void
TEH_keys_denomination_revoke (const struct
TALER_DenominationHashP *h_denom_pub);
TEH_keys_denomination_revoke (
const struct TALER_DenominationHashP *h_denom_pub);
/**

3
src/exchange/taler-exchange-httpd_metrics.h
View File

@ -36,7 +36,8 @@ enum TEH_MetricTypeRequest
TEH_MT_REQUEST_WITHDRAW = 2,
TEH_MT_REQUEST_MELT = 3,
TEH_MT_REQUEST_PURSE_CREATE = 4,
TEH_MT_REQUEST_COUNT = 5 /* MUST BE LAST! */
TEH_MT_REQUEST_PURSE_MERGE = 5,
TEH_MT_REQUEST_COUNT = 6 /* MUST BE LAST! */
};
/**

60
src/exchange/taler-exchange-httpd_purses_merge.c
View File

@ -32,6 +32,7 @@
#include "taler-exchange-httpd_responses.h"
#include "taler_exchangedb_lib.h"
#include "taler-exchange-httpd_keys.h"
#include "taler-exchange-httpd_wire.h"
/**
@ -59,6 +60,11 @@ struct PurseMergeContext
*/
struct GNUNET_TIME_Timestamp purse_expiration;
/**
* When the client signed the merge.
*/
struct GNUNET_TIME_Timestamp merge_timestamp;
/**
* Our current time.
*/
@ -92,7 +98,7 @@ struct PurseMergeContext
/**
* Fees that apply to this operation.
*/
const struct TEH_GlobalFee *gf;
const struct TALER_WireFeeSet *wf;
/**
* URI of the account the purse is to be merged into.
@ -101,7 +107,7 @@ struct PurseMergeContext
const char *payto_uri;
/**
* Base URL of the exchange provider.
* Base URL of the exchange provider hosting the reserve.
*/
char *provider_url;
@ -138,10 +144,26 @@ reply_merge_success (struct MHD_Connection *connection,
TALER_JSON_pack_amount ("balance",
&pcc->balance));
}
// FIXME: check return value...
if (0 == strcmp (pcc->provider_url,
TEH_base_url))
{
/* wad fee is always zero if we stay at our own exchange */
merge_amount = pcc->target_amount;
}
else
{
if (0 >
TALER_amount_subtract (&merge_amount,
&pcc->target_amount,
&gf->fees.merge);
&pcc->wf->wad))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_ec (
connection,
TALER_EC_EXCHANGE_PURSE_MERGE_WAD_FEE_EXCEEDS_PURSE_VALUE,
TALER_amount2s (&pcc->wf->wad));
}
}
if (TALER_EC_NONE !=
(ec = TALER_exchange_online_purse_merged_sign (
&TEH_keys_exchange_sign_,
@ -149,8 +171,9 @@ reply_merge_success (struct MHD_Connection *connection,
pcc->purse_expiration,
&merge_amount,
pcc->purse_pub,
&pcc->merge_pub,
&pcc->h_contract_terms,
&pcc->reserve_pub,
pcc->provider_url,
&pub,
&sig)))
{
@ -200,7 +223,7 @@ merge_transaction (void *cls,
&pcc->merge_sig,
pcc->merge_timestamp,
pcc->provider_url,
&pcc.reserve_pub);
&pcc->reserve_pub);
if (qs < 0)
{
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
@ -250,7 +273,7 @@ TEH_handler_purses_merge (
};
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("payto_uri",
&pcc.payt_uri),
&pcc.payto_uri),
GNUNET_JSON_spec_fixed_auto ("reserve_sig",
&pcc.reserve_sig),
GNUNET_JSON_spec_fixed_auto ("merge_sig",
@ -281,9 +304,9 @@ TEH_handler_purses_merge (
}
}
pcc.gf = TEH_keys_global_fee_by_time (TEH_keys_get_state (),
pcc.exchange_timestamp);
if (NULL == pcc.gf)
pcc.wf = TEH_wire_fees_by_time (pcc.exchange_timestamp,
"sepa"); // FIXME!
if (NULL == pcc.wf)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Cannot create purse: global fees not configured!\n");
@ -294,13 +317,13 @@ TEH_handler_purses_merge (
}
/* Fetch purse details */
qs = TEH_plugin->select_purse_request (TEH_plugin->cls,
pcc->purse_pub,
&pcc->merge_pub,
&pcc->purse_expiration,
&pcc->h_contract_terms,
&pcc->min_age,
&pcc->target_amount,
&pcc->balance,
pcc.purse_pub,
&pcc.merge_pub,
&pcc.purse_expiration,
&pcc.h_contract_terms,
&pcc.min_age,
&pcc.target_amount,
&pcc.balance,
&purse_sig);
switch (qs)
{
@ -395,8 +418,9 @@ TEH_handler_purses_merge (
/* check signatures */
if (GNUNET_OK !=
TALER_wallet_purse_merge_verify (
pcc.payto_url,
pcc.payto_uri,
pcc.merge_timestamp,
pcc.purse_pub,
&pcc.merge_pub,
&pcc.merge_sig))
{

46
src/exchange/taler-exchange-httpd_purses_merge.h Normal file
View File

@ -0,0 +1,46 @@
/*
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 Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-httpd_purses_merge.h
* @brief Handle /purses/$PID/merge requests
* @author Christian Grothoff
*/
#ifndef TALER_EXCHANGE_HTTPD_PURSES_MERGE_H
#define TALER_EXCHANGE_HTTPD_PURSES_MERGE_H
#include <gnunet/gnunet_util_lib.h>
#include <microhttpd.h>
#include "taler-exchange-httpd.h"
/**
* Handle a "/purses/$PURSE_PUB/merge" request. Parses the JSON, and, if
* successful, passes the JSON data to #merge_transaction() to further check
* the details of the operation specified. If everything checks out, this
* will ultimately lead to the "purses merge" being executed, or rejected.
*
* @param connection the MHD connection to handle
* @param purse_pub public key of the purse
* @param root uploaded JSON data
* @return MHD result code
*/
MHD_RESULT
TEH_handler_purses_merge (struct MHD_Connection *connection,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const json_t *root);
#endif

16
src/exchange/taler-exchange-httpd_wire.c
View File

@ -158,11 +158,13 @@ make_ec_reply (enum TALER_ErrorCode ec,
const char *detail)
{
return GNUNET_JSON_PACK (
GNUNET_JSON_pack_uint64 ("code", ec),
GNUNET_JSON_pack_uint64 ("code",
ec),
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (ec)),
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_string ("detail", detail)));
GNUNET_JSON_pack_string ("detail",
detail)));
}
@ -421,4 +423,14 @@ TEH_handler_wire (struct TEH_RequestContext *rc,
}
const struct TALER_WireFeeSet *
TEH_wire_fees_by_time (
struct GNUNET_TIME_Timestamp ts,
const char *method)
{
GNUNET_break (0); // FIXME: implement!
return NULL;
}
/* end of taler-exchange-httpd_wire.c */

14
src/exchange/taler-exchange-httpd_wire.h
View File

@ -33,6 +33,20 @@ void
TEH_wire_done (void);
/**
* Look up wire fee structure by @a ts.
*
* @param ts timestamp to lookup wire fees at
* @param method wire method to lookup fees for
* @return the wire fee details, or
* NULL if none are configured for @a ts and @a method
*/
const struct TALER_WireFeeSet *
TEH_wire_fees_by_time (
struct GNUNET_TIME_Timestamp ts,
const char *method);
/**
* Initialize wire subsystem.
*

27
src/include/taler_crypto_lib.h
View File

@ -3875,6 +3875,33 @@ TALER_exchange_online_purse_created_verify (
const struct TALER_ExchangeSignatureP *sig);
enum TALER_ErrorCode
TALER_exchange_online_purse_merged_sign (
TALER_ExchangeSignCallback scb,
struct GNUNET_TIME_Timestamp exchange_time,
struct GNUNET_TIME_Timestamp purse_expiration,
const struct TALER_Amount *amount_without_fee,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const struct TALER_PrivateContractHashP *h_contract_terms,
const struct TALER_ReservePublicKeyP *reserve_pub,
const char *exchange_url,
struct TALER_ExchangePublicKeyP *pub,
struct TALER_ExchangeSignatureP *sig);
enum GNUNET_GenericReturnValue
TALER_exchange_online_purse_merged_verify (
struct GNUNET_TIME_Timestamp exchange_time,
struct GNUNET_TIME_Timestamp purse_expiration,
const struct TALER_Amount *amount_without_fee,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const struct TALER_PrivateContractHashP *h_contract_terms,
const struct TALER_ReservePublicKeyP *reserve_pub,
const char *exchange_url,
const struct TALER_ExchangePublicKeyP *pub,
const struct TALER_ExchangeSignatureP *sig);
/* ********************* offline signing ************************** */

24
src/include/taler_exchange_service.h
View File

@ -4383,12 +4383,14 @@ struct TALER_EXCHANGE_AccountMergeHandle;
* Inform the exchange that a purse should be merged
* with a reserve.
*
* @param ctx the context
* @param url HTTP base URL for the exchange with the purse
* @param exchange the exchange hosting the purse
* @param reserve_exchange_url base URL of the exchange with the reserve
* @param reserve_priv private key of the reserve to merge into
* @param purse_pub public key of the purse to merge
* @param merge_priv private key granting us the right to merge
* @param h_contract_terms hash of the purses' contract
* @param min_age minimum age of deposits into the purse
* @param purse_value_after_fees amount that should be in the purse
* @param merge_timestamp when is the merge happening (current time)
* @param cb function to call with the exchange's result
* @param cb_cls closure for @a cb
@ -4396,12 +4398,14 @@ struct TALER_EXCHANGE_AccountMergeHandle;
*/
struct TALER_EXCHANGE_AccountMergeHandle *
TALER_EXCHANGE_account_merge (
struct GNUNET_CURL_Context *ctx,
const char *url,
struct TALER_EXCHANGE_Handle *exchange,
const char *reserve_exchange_url,
const struct TALER_ReservePrivateKeyP *reserve_priv,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const struct TALER_PurseMergePrivateKeyP *merge_priv,
const struct TALER_PrivateContractHashP *h_contract_terms,
uint8_t min_age,
const struct TALER_Amount *purse_value_after_fees,
struct GNUNET_TIME_Timestamp merge_timestamp,
TALER_EXCHANGE_AccountMergeCallback cb,
void *cb_cls);
@ -4466,8 +4470,7 @@ struct TALER_EXCHANGE_PurseCreateMergeHandle;
* Inform the exchange that a purse should be created
* and merged with a reserve.
*
* @param ctx the context
* @param url HTTP base URL for the exchange
* @param exchange the exchange hosting the reserve
* @param reserve_priv private key of the reserve
* @param purse_priv private key of the purse
* @param contract_terms contract the purse is about
@ -4481,8 +4484,7 @@ struct TALER_EXCHANGE_PurseCreateMergeHandle;
*/
struct TALER_EXCHANGE_PurseCreateMergeHandle *
TALER_EXCHANGE_purse_create_with_merge (
struct GNUNET_CURL_Context *ctx,
const char *url,
struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_ReservePrivateKeyP *reserve_priv,
const struct TALER_PurseContractPrivateKeyP *purse_priv,
const json_t *contract_terms,
@ -4553,8 +4555,7 @@ struct TALER_EXCHANGE_PurseDepositHandle;
* Inform the exchange that a deposit should be made into
* a purse.
*
* @param ctx the context
* @param url HTTP base URL for the exchange where we make the deposit
* @param exchange the exchange that issued the coins
* @param purse_exchange_url base URL of the exchange hosting the purse
* @param purse_pub public key of the purse to merge
* @param min_age minimum age we need to prove for the purse
@ -4566,8 +4567,7 @@ struct TALER_EXCHANGE_PurseDepositHandle;
*/
struct TALER_EXCHANGE_PurseDepositHandle *
TALER_EXCHANGE_purse_deposit (
struct GNUNET_CURL_Context *ctx,
const char *url,
struct TALER_EXCHANGE_Handle *exchange,
const char *purse_exchange_url,
const struct TALER_PurseContractPublicKeyP *purse_pub,
uint8_t min_age,

7
src/include/taler_signatures.h
View File

@ -182,6 +182,13 @@
*/
#define TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_CREATION 1045
/**
* Signature by which the exchange affirms that a purse
* was merged into a reserve with a certain amount in it.
*/
#define TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED 1046
/**********************/
/* Auditor signatures */
/**********************/

408
src/lib/exchange_api_purse_merge.c Normal file
View File

@ -0,0 +1,408 @@
/*
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
<http://www.gnu.org/licenses/>
*/
/**
* @file lib/exchange_api_purse_merge.c
* @brief Implementation of the client to merge a purse
* into an account
* @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_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 merge with deposit handle
*/
struct TALER_EXCHANGE_AccountMergeHandle
{
/**
* 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_AccountMergeCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Expected value in the purse after fees.
*/
struct TALER_Amount purse_value_after_fees;
/**
* Public key of the merge capability.
*/
struct TALER_AccountMergePublicKeyP merge_pub;
/**
* Public key of the purse.
*/
struct TALER_PurseContractPublicKeyP purse_pub;
/**
* Hash over the purse's contrac terms.
*/
struct TALER_PrivateContractHashP h_contract_terms;
/**
* When does the purse expire.
*/
struct GNUNET_TIME_Timestamp purse_expiration;
};
/**
* Function called when we're done processing the
* HTTP /purse/$PID/merge request.
*
* @param cls the `struct TALER_EXCHANGE_AccountMergeHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_purse_merge_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_AccountMergeHandle *pch = cls;
const json_t *j = response;
struct TALER_EXCHANGE_AccountMergeResponse 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_TIME_Timestamp etime;
struct TALER_Amount total_deposited;
struct TALER_ExchangeSignatureP exchange_sig;
struct TALER_ExchangePublicKeyP exchange_pub;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("exchange_sig",
&exchange_sig),
GNUNET_JSON_spec_fixed_auto ("exchange_pub",
&exchange_pub),
GNUNET_JSON_spec_timestamp ("exchange_timestamp",
&etime),
TALER_JSON_spec_amount ("total_deposited",
pch->purse_value_after_fees.currency,
&total_deposited),
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 (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_MERGE_EXCHANGE_SIGNATURE_INVALID;
break;
}
if (GNUNET_OK !=
TALER_exchange_online_purse_merged_verify (
etime,
pch->purse_expiration,
&pch->purse_value_after_fees,
&total_deposited,
&pch->purse_pub,
&pch->merge_pub,
&pch->h_contract_terms,
&exchange_pub,
&exchange_sig))
{
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
break;
}
}
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_merge_with_deposit_cancel (pch);
}
struct TALER_EXCHANGE_AccountMergeHandle *
TALER_EXCHANGE_account_merge (
struct TALER_EXCHANGE_Handle *exchange,
const char *reserve_exchange_url,
const struct TALER_ReservePrivateKeyP *reserve_priv,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const struct TALER_PurseMergePrivateKeyP *merge_priv,
const struct TALER_PrivateContractHashP *h_contract_terms,
uint8_t min_age,
const struct TALER_Amount *purse_value_after_fees,
struct GNUNET_TIME_Timestamp purse_expiration,
struct GNUNET_TIME_Timestamp merge_timestamp,
TALER_EXCHANGE_AccountMergeCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_AccountMergeHandle *pch;
struct GNUNET_CURL_Context *ctx;
json_t *merge_obj;
CURL *eh;
struct TALER_PurseMergeSignatureP merge_sig;
struct TALER_ReserveSignatureP account_sig;
char arg_str[sizeof (pch->purse_pub) * 2 + 32];
char *url;
char *reserve_url;
pch = GNUNET_new (struct TALER_EXCHANGE_AccountMergeHandle);
pch->exchange = exchange;
pch->cb = cb;
pch->cb_cls = cb_cls;
pch->merge_timestamp = merge_timestamp;
pch->purse_pub = *purse_pub;
pch->h_contract_terms = *h_contract_terms;
pch->purse_expiration = purse_expiration;
pch->purse_value_after_fees = *purse_value_after_fees;
GNUNET_assert (GNUNET_YES ==
TEAH_handle_is_ready (exchange));
{
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/merge",
pub_str);
}
{
struct TALER_ReservePublicKeyP reserve_pub;
char pub_str[sizeof (reserve_pub) * 2];
char *end;
const char *exchange_url;
bool is_http;
GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
&reserve_pub.eddsa_pub);
end = GNUNET_STRINGS_data_to_string (
&reserve_pub,
sizeof (reserve_pub),
pub_str,
sizeof (pub_str));
*end = '\0';
if (0 == strncmp (reserve_exchange_url,
"http://",
strlen ("http://")))
{
is_http = true;
exchange_url = &reserve_exchange_url[strlen ("http://")];
}
else if (0 == strncmp (reserve_exchange_url,
"https://",
strlen ("https://")))
{
is_http = false;
exchange_url = &reserve_exchange_url[strlen ("https://")];
}
else
{
GNUNET_break (0);
GNUNET_free (pch);
return NULL;
}
GNUNET_asprintf (&reserve_url,
"payto://%s/%s/%s",
is_http ? "taler+http" : "taler",
pub_str,
exchange_url);
}
pch->url = TEAH_path_to_url (exchange,
arg_str);
if (NULL == pch->url)
{
GNUNET_break (0);
GNUNET_free (pch);
return NULL;
}
GNUNET_CRYPTO_eddsa_key_get_public (&merge_priv->eddsa_priv,
&pch->merge_pub.eddsa_pub);
TALER_wallet_purse_merge_sign (reserve_url,
merge_timestamp,
purse_pub,
merge_priv,
&merge_sig);
TALER_wallet_account_merge_sign (merge_timestamp,
purse_pub,
purse_expiration,
h_contract_terms,
purse_value_after_fees,
min_age,
reserve_priv,
&reserve_sig);
merge_obj = GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("payto_uri",
reserve_url),
GNUNET_JSON_pack_data_auto ("merge_sig",
&merge_sig),
GNUNET_JSON_pack_data_auto ("reserve_sig",
&reserve_sig),
GNUNET_JSON_pack_timestamp ("merge_timestamp",
merge_timestamp));
GNUNET_assert (NULL != merge_obj);
eh = TALER_EXCHANGE_curl_easy_get_ (pch->url);
if ( (NULL == eh) ||
(GNUNET_OK !=
TALER_curl_easy_post (&pch->ctx,
eh,
merge_obj)) )
{
GNUNET_break (0);
if (NULL != eh)
curl_easy_cleanup (eh);
json_decref (merge_obj);
GNUNET_free (pch->url);
GNUNET_free (pch);
return NULL;
}
json_decref (merge_obj);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"URL for purse merge 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_merge_deposit_finished,
pch);
return pch;
}
void
TALER_EXCHANGE_account_merge_cancel (
struct TALER_EXCHANGE_AccountMergeHandle *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_merge.c */

131
src/util/exchange_signatures.c
View File

@ -1338,6 +1338,10 @@ TALER_exchange_online_purse_created_sign (
.exchange_time = GNUNET_TIME_timestamp_hton (exchange_time)
};
TALER_amount_hton (&dc.amount_without_fee,
amount_without_fee);
TALER_amount_hton (&dc.total_deposited,
total_deposited);
return scb (&dc.purpose,
pub,
sig);
@ -1366,6 +1370,10 @@ TALER_exchange_online_purse_created_verify (
.exchange_time = GNUNET_TIME_timestamp_hton (exchange_time)
};
TALER_amount_hton (&dc.amount_without_fee,
amount_without_fee);
TALER_amount_hton (&dc.total_deposited,
total_deposited);
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_CREATION,
&dc,
@ -1374,4 +1382,127 @@ TALER_exchange_online_purse_created_verify (
}
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Response by which the exchange affirms that it has
* merged a purse into a reserve.
*/
struct TALER_PurseMergedConfirmationPS
{
/**
* Purpose is #TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED
*/
struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
/**
* When did the exchange receive the deposits.
*/
struct GNUNET_TIME_TimestampNBO exchange_time;
/**
* When will the purse expire?
*/
struct GNUNET_TIME_TimestampNBO purse_expiration;
/**
* How much should the purse ultimately contain.
*/
struct TALER_AmountNBO amount_without_fee;
/**
* Public key of the purse.
*/
struct TALER_PurseContractPublicKeyP purse_pub;
/**
* Public key of the reserve.
*/
struct TALER_ReservePublicKeyP reserve_pub;
/**
* Hash of the contract of the purse.
*/
struct TALER_PrivateContractHashP h_contract_terms;
/**
* Hash of the provider URL hosting the reserve.
*/
struct GNUNET_HashCode h_provider_url;
};
GNUNET_NETWORK_STRUCT_END
enum TALER_ErrorCode
TALER_exchange_online_purse_merged_sign (
TALER_ExchangeSignCallback scb,
struct GNUNET_TIME_Timestamp exchange_time,
struct GNUNET_TIME_Timestamp purse_expiration,
const struct TALER_Amount *amount_without_fee,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const struct TALER_PrivateContractHashP *h_contract_terms,
const struct TALER_ReservePublicKeyP *reserve_pub,
const char *exchange_url,
struct TALER_ExchangePublicKeyP *pub,
struct TALER_ExchangeSignatureP *sig)
{
struct TALER_PurseMergedConfirmationPS dc = {
.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED),
.purpose.size = htonl (sizeof (dc)),
.h_contract_terms = *h_contract_terms,
.purse_pub = *purse_pub,
.reserve_pub = *reserve_pub,
.purse_expiration = GNUNET_TIME_timestamp_hton (purse_expiration),
.exchange_time = GNUNET_TIME_timestamp_hton (exchange_time)
};
TALER_amount_hton (&dc.amount_without_fee,
amount_without_fee);
GNUNET_CRYPTO_hash (exchange_url,
strlen (exchange_url) + 1,
&dc.h_provider_url);
return scb (&dc.purpose,
pub,
sig);
}
enum GNUNET_GenericReturnValue
TALER_exchange_online_purse_merged_verify (
struct GNUNET_TIME_Timestamp exchange_time,
struct GNUNET_TIME_Timestamp purse_expiration,
const struct TALER_Amount *amount_without_fee,
const struct TALER_PurseContractPublicKeyP *purse_pub,
const struct TALER_PrivateContractHashP *h_contract_terms,
const struct TALER_ReservePublicKeyP *reserve_pub,
const char *exchange_url,
const struct TALER_ExchangePublicKeyP *pub,
const struct TALER_ExchangeSignatureP *sig)
{
struct TALER_PurseMergedConfirmationPS dc = {
.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED),
.purpose.size = htonl (sizeof (dc)),
.h_contract_terms = *h_contract_terms,
.purse_pub = *purse_pub,
.reserve_pub = *reserve_pub,
.purse_expiration = GNUNET_TIME_timestamp_hton (purse_expiration),
.exchange_time = GNUNET_TIME_timestamp_hton (exchange_time)
};
TALER_amount_hton (&dc.amount_without_fee,
amount_without_fee);
GNUNET_CRYPTO_hash (exchange_url,
strlen (exchange_url) + 1,
&dc.h_provider_url);
return
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_PURSE_MERGED,
&dc,
&sig->eddsa_signature,
&pub->eddsa_pub);
}
/* end of exchange_signatures.c */