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exchange/src/lib/exchange_api_purse_create_with_merge.c
Christian Grothoff b9a30d29cb
-fix minor bugs
2022-06-07 15:02:16 +02:00

553 lines
17 KiB
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/*
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_create_with_merge.c
* @brief Implementation of the client to create a
* purse for 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 "exchange_api_common.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* @brief A purse create with merge handle
*/
struct TALER_EXCHANGE_PurseCreateMergeHandle
{
/**
* 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_PurseCreateMergeCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* The encrypted contract (if any).
*/
struct TALER_EncryptedContract econtract;
/**
* Expected value in the purse after fees.
*/
struct TALER_Amount purse_value_after_fees;
/**
* Public key of the reserve public key.
*/
struct TALER_ReservePublicKeyP reserve_pub;
/**
* Reserve signature affirming our merge.
*/
struct TALER_ReserveSignatureP reserve_sig;
/**
* Merge capability key.
*/
struct TALER_PurseMergePublicKeyP merge_pub;
/**
* Our merge signature (if any).
*/
struct TALER_PurseMergeSignatureP merge_sig;
/**
* Public key of the purse.
*/
struct TALER_PurseContractPublicKeyP purse_pub;
/**
* Request data we signed over.
*/
struct TALER_PurseContractSignatureP purse_sig;
/**
* Hash over the purse's contrac terms.
*/
struct TALER_PrivateContractHashP h_contract_terms;
/**
* When does the purse expire.
*/
struct GNUNET_TIME_Timestamp purse_expiration;
/**
* When does the purse get merged/created.
*/
struct GNUNET_TIME_Timestamp merge_timestamp;
};
/**
* Function called when we're done processing the
* HTTP /reserves/$RID/purse request.
*
* @param cls the `struct TALER_EXCHANGE_PurseCreateMergeHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_purse_create_with_merge_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_PurseCreateMergeHandle *pcm = cls;
const json_t *j = response;
struct TALER_EXCHANGE_PurseCreateMergeResponse dr = {
.hr.reply = j,
.hr.http_status = (unsigned int) response_code,
.reserve_sig = &pcm->reserve_sig
};
pcm->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[] = {
TALER_JSON_spec_amount_any ("total_deposited",
&total_deposited),
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),
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 (pcm->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_GENERIC_REPLY_MALFORMED;
break;
}
if (GNUNET_OK !=
TALER_exchange_online_purse_created_verify (
etime,
pcm->purse_expiration,
&pcm->purse_value_after_fees,
&total_deposited,
&pcm->purse_pub,
&pcm->h_contract_terms,
&exchange_pub,
&exchange_sig))
{
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
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:
dr.hr.ec = TALER_JSON_get_error_code (j);
switch (dr.hr.ec)
{
case TALER_EC_EXCHANGE_RESERVES_PURSE_CREATE_CONFLICTING_META_DATA:
if (GNUNET_OK !=
TALER_EXCHANGE_check_purse_create_conflict_ (
&pcm->purse_sig,
&pcm->purse_pub,
j))
{
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
break;
case TALER_EC_EXCHANGE_RESERVES_PURSE_MERGE_CONFLICTING_META_DATA:
if (GNUNET_OK !=
TALER_EXCHANGE_check_purse_merge_conflict_ (
&pcm->merge_sig,
&pcm->merge_pub,
&pcm->purse_pub,
pcm->exchange->url,
j))
{
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
break;
case TALER_EC_EXCHANGE_RESERVES_PURSE_CREATE_INSUFFICIENT_FUNDS:
/* nothing to verify */
break;
case TALER_EC_EXCHANGE_PURSE_ECONTRACT_CONFLICTING_META_DATA:
if (GNUNET_OK !=
TALER_EXCHANGE_check_purse_econtract_conflict_ (
&pcm->econtract.econtract_sig,
&pcm->purse_pub,
j))
{
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
break;
default:
/* unexpected EC! */
GNUNET_break_op (0);
dr.hr.http_status = 0;
dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
} /* end inner (EC) switch */
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_UNAVAILABLE_FOR_LEGAL_REASONS:
/* aka KYC required */
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;
}
pcm->cb (pcm->cb_cls,
&dr);
TALER_EXCHANGE_purse_create_with_merge_cancel (pcm);
}
struct TALER_EXCHANGE_PurseCreateMergeHandle *
TALER_EXCHANGE_purse_create_with_merge (
struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_ReservePrivateKeyP *reserve_priv,
const struct TALER_PurseContractPrivateKeyP *purse_priv,
const struct TALER_PurseMergePrivateKeyP *merge_priv,
const struct TALER_ContractDiffiePrivateP *contract_priv,
const json_t *contract_terms,
bool upload_contract,
bool pay_for_purse,
struct GNUNET_TIME_Timestamp merge_timestamp,
TALER_EXCHANGE_PurseCreateMergeCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_PurseCreateMergeHandle *pcm;
struct GNUNET_CURL_Context *ctx;
json_t *create_with_merge_obj;
CURL *eh;
char arg_str[sizeof (pcm->reserve_pub) * 2 + 32];
uint32_t min_age = 0;
struct TALER_Amount purse_fee;
enum TALER_WalletAccountMergeFlags flags;
pcm = GNUNET_new (struct TALER_EXCHANGE_PurseCreateMergeHandle);
pcm->exchange = exchange;
pcm->cb = cb;
pcm->cb_cls = cb_cls;
if (GNUNET_OK !=
TALER_JSON_contract_hash (contract_terms,
&pcm->h_contract_terms))
{
GNUNET_break (0);
GNUNET_free (pcm);
return NULL;
}
pcm->merge_timestamp = merge_timestamp;
GNUNET_CRYPTO_eddsa_key_get_public (&purse_priv->eddsa_priv,
&pcm->purse_pub.eddsa_pub);
GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
&pcm->reserve_pub.eddsa_pub);
GNUNET_CRYPTO_eddsa_key_get_public (&merge_priv->eddsa_priv,
&pcm->merge_pub.eddsa_pub);
{
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount_any ("amount",
&pcm->purse_value_after_fees),
GNUNET_JSON_spec_mark_optional (
GNUNET_JSON_spec_uint32 ("minimum_age",
&min_age),
NULL),
GNUNET_JSON_spec_timestamp ("pay_deadline",
&pcm->purse_expiration),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (contract_terms,
spec,
NULL, NULL))
{
GNUNET_break (0);
GNUNET_free (pcm);
return NULL;
}
}
if (pay_for_purse)
{
const struct TALER_EXCHANGE_GlobalFee *gf;
gf = TALER_EXCHANGE_get_global_fee (
TALER_EXCHANGE_get_keys (exchange),
GNUNET_TIME_timestamp_get ());
purse_fee = gf->fees.purse;
flags = TALER_WAMF_MODE_CREATE_WITH_PURSE_FEE;
}
else
{
GNUNET_assert (GNUNET_OK ==
TALER_amount_set_zero (pcm->purse_value_after_fees.currency,
&purse_fee));
flags = TALER_WAMF_MODE_CREATE_FROM_PURSE_QUOTA;
}
GNUNET_assert (GNUNET_YES ==
TEAH_handle_is_ready (exchange));
{
char pub_str[sizeof (pcm->reserve_pub) * 2];
char *end;
end = GNUNET_STRINGS_data_to_string (
&pcm->reserve_pub,
sizeof (pcm->reserve_pub),
pub_str,
sizeof (pub_str));
*end = '\0';
GNUNET_snprintf (arg_str,
sizeof (arg_str),
"/reserves/%s/purse",
pub_str);
}
pcm->url = TEAH_path_to_url (exchange,
arg_str);
if (NULL == pcm->url)
{
GNUNET_break (0);
GNUNET_free (pcm);
return NULL;
}
TALER_wallet_purse_create_sign (pcm->purse_expiration,
&pcm->h_contract_terms,
&pcm->merge_pub,
min_age,
&pcm->purse_value_after_fees,
purse_priv,
&pcm->purse_sig);
TALER_wallet_purse_merge_sign (exchange->url,
merge_timestamp,
&pcm->purse_pub,
merge_priv,
&pcm->merge_sig);
TALER_wallet_account_merge_sign (merge_timestamp,
&pcm->purse_pub,
pcm->purse_expiration,
&pcm->h_contract_terms,
&pcm->purse_value_after_fees,
&purse_fee,
min_age,
flags,
reserve_priv,
&pcm->reserve_sig);
if (upload_contract)
{
TALER_CRYPTO_contract_encrypt_for_deposit (
&pcm->purse_pub,
contract_priv,
contract_terms,
&pcm->econtract.econtract,
&pcm->econtract.econtract_size);
GNUNET_CRYPTO_ecdhe_key_get_public (&contract_priv->ecdhe_priv,
&pcm->econtract.contract_pub.ecdhe_pub);
TALER_wallet_econtract_upload_sign (
pcm->econtract.econtract,
pcm->econtract.econtract_size,
&pcm->econtract.contract_pub,
purse_priv,
&pcm->econtract.econtract_sig);
}
create_with_merge_obj = GNUNET_JSON_PACK (
TALER_JSON_pack_amount ("purse_value",
&pcm->purse_value_after_fees),
GNUNET_JSON_pack_uint64 ("min_age",
min_age),
GNUNET_JSON_pack_allow_null (
TALER_JSON_pack_econtract ("econtract",
upload_contract
? &pcm->econtract
: NULL)),
GNUNET_JSON_pack_allow_null (
pay_for_purse
? TALER_JSON_pack_amount ("purse_fee",
&purse_fee)
: GNUNET_JSON_pack_string ("dummy2",
NULL)),
GNUNET_JSON_pack_data_auto ("merge_pub",
&pcm->merge_pub),
GNUNET_JSON_pack_data_auto ("merge_sig",
&pcm->merge_sig),
GNUNET_JSON_pack_data_auto ("reserve_sig",
&pcm->reserve_sig),
GNUNET_JSON_pack_data_auto ("purse_pub",
&pcm->purse_pub),
GNUNET_JSON_pack_data_auto ("purse_sig",
&pcm->purse_sig),
GNUNET_JSON_pack_data_auto ("h_contract_terms",
&pcm->h_contract_terms),
GNUNET_JSON_pack_timestamp ("merge_timestamp",
merge_timestamp),
GNUNET_JSON_pack_timestamp ("purse_expiration",
pcm->purse_expiration));
GNUNET_assert (NULL != create_with_merge_obj);
eh = TALER_EXCHANGE_curl_easy_get_ (pcm->url);
if ( (NULL == eh) ||
(GNUNET_OK !=
TALER_curl_easy_post (&pcm->ctx,
eh,
create_with_merge_obj)) )
{
GNUNET_break (0);
if (NULL != eh)
curl_easy_cleanup (eh);
json_decref (create_with_merge_obj);
GNUNET_free (pcm->econtract.econtract);
GNUNET_free (pcm->url);
GNUNET_free (pcm);
return NULL;
}
json_decref (create_with_merge_obj);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"URL for purse create_with_merge: `%s'\n",
pcm->url);
ctx = TEAH_handle_to_context (exchange);
pcm->job = GNUNET_CURL_job_add2 (ctx,
eh,
pcm->ctx.headers,
&handle_purse_create_with_merge_finished,
pcm);
return pcm;
}
void
TALER_EXCHANGE_purse_create_with_merge_cancel (
struct TALER_EXCHANGE_PurseCreateMergeHandle *pcm)
{
if (NULL != pcm->job)
{
GNUNET_CURL_job_cancel (pcm->job);
pcm->job = NULL;
}
GNUNET_free (pcm->url);
TALER_curl_easy_post_finished (&pcm->ctx);
GNUNET_free (pcm->econtract.econtract);
GNUNET_free (pcm);
}
/* end of exchange_api_purse_create_with_merge.c */
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