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exchange/src/lib/exchange_api_batch_deposit.c
Christian Grothoff d3772a834f
more API clean up
2023-07-03 18:39:06 +02:00

771 lines
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/*
This file is part of TALER
Copyright (C) 2014-2022 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_batch_deposit.c
* @brief Implementation of the /batch-deposit request of the exchange's HTTP API
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
* @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_auditor_service.h"
#include "taler_exchange_service.h"
#include "exchange_api_common.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* 1:#AUDITOR_CHANCE is the probability that we report deposits
* to the auditor.
*
* 20==5% of going to auditor. This is possibly still too high, but set
* deliberately this high for testing
*/
#define AUDITOR_CHANCE 20
/**
* Entry in list of ongoing interactions with an auditor.
*/
struct TEAH_AuditorInteractionEntry
{
/**
* DLL entry.
*/
struct TEAH_AuditorInteractionEntry *next;
/**
* DLL entry.
*/
struct TEAH_AuditorInteractionEntry *prev;
/**
* URL of our auditor. For logging.
*/
const char *auditor_url;
/**
* Interaction state.
*/
struct TALER_AUDITOR_DepositConfirmationHandle *dch;
/**
* Batch deposit this is for.
*/
struct TALER_EXCHANGE_BatchDepositHandle *dh;
};
/**
* @brief A Deposit Handle
*/
struct TALER_EXCHANGE_BatchDepositHandle
{
/**
* The keys of the exchange.
*/
struct TALER_EXCHANGE_Keys *keys;
/**
* Context for our curl request(s).
*/
struct GNUNET_CURL_Context *ctx;
/**
* 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 post_ctx;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_BatchDepositResultCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Details about the contract.
*/
struct TALER_EXCHANGE_DepositContractDetail dcd;
/**
* Array with details about the coins.
*/
struct TALER_EXCHANGE_CoinDepositDetail *cdds;
/**
* Hash of the merchant's wire details.
*/
struct TALER_MerchantWireHashP h_wire;
/**
* Hash over the extensions, or all zero.
*/
struct TALER_ExtensionPolicyHashP h_policy;
/**
* Time when this confirmation was generated / when the exchange received
* the deposit request.
*/
struct GNUNET_TIME_Timestamp exchange_timestamp;
/**
* Exchange signatures, set for #auditor_cb.
*/
struct TALER_ExchangeSignatureP *exchange_sigs;
/**
* Head of DLL of interactions with this auditor.
*/
struct TEAH_AuditorInteractionEntry *ai_head;
/**
* Tail of DLL of interactions with this auditor.
*/
struct TEAH_AuditorInteractionEntry *ai_tail;
/**
* Result to return to the application once @e ai_head is empty.
*/
struct TALER_EXCHANGE_BatchDepositResult dr;
/**
* Exchange signing public key, set for #auditor_cb.
*/
struct TALER_ExchangePublicKeyP exchange_pub;
/**
* Response object to free at the end.
*/
json_t *response;
/**
* Chance that we will inform the auditor about the deposit
* is 1:n, where the value of this field is "n".
*/
unsigned int auditor_chance;
/**
* Length of the @e cdds array.
*/
unsigned int num_cdds;
};
/**
* Finish batch deposit operation by calling the callback.
*
* @param[in] dh handle to finished batch deposit operation
*/
static void
finish_dh (struct TALER_EXCHANGE_BatchDepositHandle *dh)
{
dh->cb (dh->cb_cls,
&dh->dr);
TALER_EXCHANGE_batch_deposit_cancel (dh);
}
/**
* Function called with the result from our call to the
* auditor's /deposit-confirmation handler.
*
* @param cls closure of type `struct TEAH_AuditorInteractionEntry *`
* @param dcr response
*/
static void
acc_confirmation_cb (
void *cls,
const struct TALER_AUDITOR_DepositConfirmationResponse *dcr)
{
struct TEAH_AuditorInteractionEntry *aie = cls;
struct TALER_EXCHANGE_BatchDepositHandle *dh = aie->dh;
if (MHD_HTTP_OK != dcr->hr.http_status)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Failed to submit deposit confirmation to auditor `%s' with HTTP status %d (EC: %d). This is acceptable if it does not happen often.\n",
aie->auditor_url,
dcr->hr.http_status,
dcr->hr.ec);
}
GNUNET_CONTAINER_DLL_remove (dh->ai_head,
dh->ai_tail,
aie);
GNUNET_free (aie);
if (NULL == dh->ai_head)
finish_dh (dh);
}
/**
* Function called for each auditor to give us a chance to possibly
* launch a deposit confirmation interaction.
*
* @param cls closure
* @param auditor_url base URL of the auditor
* @param auditor_pub public key of the auditor
*/
static void
auditor_cb (void *cls,
const char *auditor_url,
const struct TALER_AuditorPublicKeyP *auditor_pub)
{
struct TALER_EXCHANGE_BatchDepositHandle *dh = cls;
const struct TALER_EXCHANGE_SigningPublicKey *spk;
struct TEAH_AuditorInteractionEntry *aie;
struct TALER_Amount amount_without_fee;
const struct TALER_EXCHANGE_DenomPublicKey *dki;
unsigned int coin;
if (0 !=
GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
dh->auditor_chance))
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Not providing deposit confirmation to auditor\n");
return;
}
coin = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
dh->num_cdds);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Will provide deposit confirmation to auditor `%s'\n",
TALER_B2S (auditor_pub));
dki = TALER_EXCHANGE_get_denomination_key_by_hash (dh->keys,
&dh->cdds[coin].h_denom_pub);
GNUNET_assert (NULL != dki);
spk = TALER_EXCHANGE_get_signing_key_info (dh->keys,
&dh->exchange_pub);
if (NULL == spk)
{
GNUNET_break_op (0);
return;
}
GNUNET_assert (0 <=
TALER_amount_subtract (&amount_without_fee,
&dh->cdds[coin].amount,
&dki->fees.deposit));
aie = GNUNET_new (struct TEAH_AuditorInteractionEntry);
aie->dh = dh;
aie->auditor_url = auditor_url;
aie->dch = TALER_AUDITOR_deposit_confirmation (
dh->ctx,
auditor_url,
&dh->h_wire,
&dh->h_policy,
&dh->dcd.h_contract_terms,
dh->exchange_timestamp,
dh->dcd.wire_deadline,
dh->dcd.refund_deadline,
&amount_without_fee,
&dh->cdds[coin].coin_pub,
&dh->dcd.merchant_pub,
&dh->exchange_pub,
&dh->exchange_sigs[coin],
&dh->keys->master_pub,
spk->valid_from,
spk->valid_until,
spk->valid_legal,
&spk->master_sig,
&acc_confirmation_cb,
aie);
GNUNET_CONTAINER_DLL_insert (dh->ai_head,
dh->ai_tail,
aie);
}
/**
* Function called when we're done processing the
* HTTP /deposit request.
*
* @param cls the `struct TALER_EXCHANGE_BatchDepositHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_deposit_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_BatchDepositHandle *dh = cls;
const json_t *j = response;
struct TALER_EXCHANGE_BatchDepositResult *dr = &dh->dr;
dh->job = NULL;
dh->response = json_incref ((json_t*) j);
dr->hr.reply = dh->response;
dr->hr.http_status = (unsigned int) response_code;
switch (response_code)
{
case 0:
dr->hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
{
const json_t *sigs;
json_t *sig;
unsigned int idx;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_array_const ("exchange_sigs",
&sigs),
GNUNET_JSON_spec_fixed_auto ("exchange_pub",
&dh->exchange_pub),
GNUNET_JSON_spec_mark_optional (
GNUNET_JSON_spec_string ("transaction_base_url",
&dr->details.ok.transaction_base_url),
NULL),
GNUNET_JSON_spec_timestamp ("exchange_timestamp",
&dh->exchange_timestamp),
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;
}
if (json_array_size (sigs) != dh->num_cdds)
{
GNUNET_break_op (0);
dr->hr.http_status = 0;
dr->hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
dh->exchange_sigs = GNUNET_new_array (dh->num_cdds,
struct TALER_ExchangeSignatureP);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (dh->keys,
&dh->exchange_pub))
{
GNUNET_break_op (0);
dr->hr.http_status = 0;
dr->hr.ec = TALER_EC_EXCHANGE_DEPOSIT_INVALID_SIGNATURE_BY_EXCHANGE;
break;
}
json_array_foreach (sigs, idx, sig)
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_fixed_auto ("exchange_sig",
&dh->exchange_sigs[idx]),
GNUNET_JSON_spec_end ()
};
struct TALER_Amount amount_without_fee;
const struct TALER_EXCHANGE_DenomPublicKey *dki;
if (GNUNET_OK !=
GNUNET_JSON_parse (sig,
ispec,
NULL, NULL))
{
GNUNET_break_op (0);
dr->hr.http_status = 0;
dr->hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
dki = TALER_EXCHANGE_get_denomination_key_by_hash (dh->keys,
&dh->cdds[idx].
h_denom_pub);
GNUNET_assert (NULL != dki);
GNUNET_assert (0 <=
TALER_amount_subtract (&amount_without_fee,
&dh->cdds[idx].amount,
&dki->fees.deposit));
if (GNUNET_OK !=
TALER_exchange_online_deposit_confirmation_verify (
&dh->dcd.h_contract_terms,
&dh->h_wire,
&dh->h_policy,
dh->exchange_timestamp,
dh->dcd.wire_deadline,
dh->dcd.refund_deadline,
&amount_without_fee,
&dh->cdds[idx].coin_pub,
&dh->dcd.merchant_pub,
&dh->exchange_pub,
&dh->exchange_sigs[idx]))
{
GNUNET_break_op (0);
dr->hr.http_status = 0;
dr->hr.ec = TALER_EC_EXCHANGE_DEPOSIT_INVALID_SIGNATURE_BY_EXCHANGE;
break;
}
}
TEAH_get_auditors_for_dc (dh->keys,
&auditor_cb,
dh);
}
dr->details.ok.exchange_sigs = dh->exchange_sigs;
dr->details.ok.exchange_pub = &dh->exchange_pub;
dr->details.ok.deposit_timestamp = dh->exchange_timestamp;
dr->details.ok.num_signatures = dh->num_cdds;
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:
{
struct TALER_CoinSpendPublicKeyP coin_pub;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("coin_pub",
&coin_pub),
GNUNET_JSON_spec_end ()
};
const struct TALER_EXCHANGE_DenomPublicKey *dki;
bool found = false;
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;
}
for (unsigned int i = 0; i<dh->num_cdds; i++)
{
if (0 !=
GNUNET_memcmp (&coin_pub,
&dh->cdds[i].coin_pub))
continue;
dki = TALER_EXCHANGE_get_denomination_key_by_hash (dh->keys,
&dh->cdds[i].
h_denom_pub);
GNUNET_assert (NULL != dki);
if (GNUNET_OK !=
TALER_EXCHANGE_check_coin_conflict_ (
dh->keys,
j,
dki,
&dh->cdds[i].coin_pub,
&dh->cdds[i].coin_sig,
&dh->cdds[i].amount))
{
GNUNET_break_op (0);
dr->hr.http_status = 0;
dr->hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
found = true;
break;
}
if (! found)
{
GNUNET_break_op (0);
dr->hr.http_status = 0;
dr->hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
break;
}
dr->hr.ec = TALER_JSON_get_error_code (j);
dr->hr.hint = TALER_JSON_get_error_hint (j);
}
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;
}
if (NULL != dh->ai_head)
return;
finish_dh (dh);
}
struct TALER_EXCHANGE_BatchDepositHandle *
TALER_EXCHANGE_batch_deposit (
struct GNUNET_CURL_Context *ctx,
const char *url,
struct TALER_EXCHANGE_Keys *keys,
const struct TALER_EXCHANGE_DepositContractDetail *dcd,
unsigned int num_cdds,
const struct TALER_EXCHANGE_CoinDepositDetail cdds[static num_cdds],
TALER_EXCHANGE_BatchDepositResultCallback cb,
void *cb_cls,
enum TALER_ErrorCode *ec)
{
struct TALER_EXCHANGE_BatchDepositHandle *dh;
json_t *deposit_obj;
json_t *deposits;
CURL *eh;
struct TALER_Amount amount_without_fee;
if (GNUNET_TIME_timestamp_cmp (dcd->refund_deadline,
>,
dcd->wire_deadline))
{
GNUNET_break_op (0);
*ec = TALER_EC_EXCHANGE_DEPOSIT_REFUND_DEADLINE_AFTER_WIRE_DEADLINE;
return NULL;
}
dh = GNUNET_new (struct TALER_EXCHANGE_BatchDepositHandle);
dh->auditor_chance = AUDITOR_CHANCE;
dh->cb = cb;
dh->cb_cls = cb_cls;
dh->cdds = GNUNET_memdup (cdds,
num_cdds
* sizeof (*cdds));
dh->num_cdds = num_cdds;
dh->dcd = *dcd;
if (NULL != dcd->policy_details)
TALER_deposit_policy_hash (dcd->policy_details,
&dh->h_policy);
TALER_merchant_wire_signature_hash (dcd->merchant_payto_uri,
&dcd->wire_salt,
&dh->h_wire);
deposits = json_array ();
GNUNET_assert (NULL != deposits);
for (unsigned int i = 0; i<num_cdds; i++)
{
const struct TALER_EXCHANGE_CoinDepositDetail *cdd = &cdds[i];
const struct TALER_EXCHANGE_DenomPublicKey *dki;
dki = TALER_EXCHANGE_get_denomination_key_by_hash (keys,
&cdd->h_denom_pub);
if (NULL == dki)
{
*ec = TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN;
GNUNET_break_op (0);
return NULL;
}
if (0 >
TALER_amount_subtract (&amount_without_fee,
&cdd->amount,
&dki->fees.deposit))
{
*ec = TALER_EC_EXCHANGE_DEPOSIT_FEE_ABOVE_AMOUNT;
GNUNET_break_op (0);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Amount: %s\n",
TALER_amount2s (&cdd->amount));
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Fee: %s\n",
TALER_amount2s (&dki->fees.deposit));
GNUNET_free (dh->cdds);
GNUNET_free (dh);
return NULL;
}
if (GNUNET_OK !=
TALER_EXCHANGE_verify_deposit_signature_ (dcd,
&dh->h_policy,
&dh->h_wire,
cdd,
dki))
{
*ec = TALER_EC_EXCHANGE_DEPOSIT_COIN_SIGNATURE_INVALID;
GNUNET_break_op (0);
GNUNET_free (dh->cdds);
GNUNET_free (dh);
return NULL;
}
GNUNET_assert (
0 ==
json_array_append_new (
deposits,
GNUNET_JSON_PACK (
TALER_JSON_pack_amount ("contribution",
&cdd->amount),
GNUNET_JSON_pack_data_auto ("denom_pub_hash",
&cdd->h_denom_pub),
TALER_JSON_pack_denom_sig ("ub_sig",
&cdd->denom_sig),
GNUNET_JSON_pack_data_auto ("coin_pub",
&cdd->coin_pub),
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_data_auto ("h_age_commitment",
&cdd->h_age_commitment)),
GNUNET_JSON_pack_data_auto ("coin_sig",
&cdd->coin_sig)
)));
}
dh->url = TALER_url_join (url,
"batch-deposit",
NULL);
if (NULL == dh->url)
{
GNUNET_break (0);
*ec = TALER_EC_GENERIC_ALLOCATION_FAILURE;
GNUNET_free (dh->url);
GNUNET_free (dh->cdds);
GNUNET_free (dh);
return NULL;
}
deposit_obj = GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("merchant_payto_uri",
dcd->merchant_payto_uri),
GNUNET_JSON_pack_data_auto ("wire_salt",
&dcd->wire_salt),
GNUNET_JSON_pack_data_auto ("h_contract_terms",
&dcd->h_contract_terms),
GNUNET_JSON_pack_array_steal ("coins",
deposits),
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_object_steal ("policy_details",
dcd->policy_details)),
GNUNET_JSON_pack_timestamp ("timestamp",
dcd->timestamp),
GNUNET_JSON_pack_data_auto ("merchant_pub",
&dcd->merchant_pub),
GNUNET_JSON_pack_allow_null (
GNUNET_JSON_pack_timestamp ("refund_deadline",
dcd->refund_deadline)),
GNUNET_JSON_pack_timestamp ("wire_transfer_deadline",
dcd->wire_deadline));
GNUNET_assert (NULL != deposit_obj);
eh = TALER_EXCHANGE_curl_easy_get_ (dh->url);
if ( (NULL == eh) ||
(GNUNET_OK !=
TALER_curl_easy_post (&dh->post_ctx,
eh,
deposit_obj)) )
{
*ec = TALER_EC_GENERIC_CURL_ALLOCATION_FAILURE;
GNUNET_break (0);
if (NULL != eh)
curl_easy_cleanup (eh);
json_decref (deposit_obj);
GNUNET_free (dh->cdds);
GNUNET_free (dh->url);
GNUNET_free (dh);
return NULL;
}
json_decref (deposit_obj);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"URL for deposit: `%s'\n",
dh->url);
dh->ctx = ctx;
dh->keys = TALER_EXCHANGE_keys_incref (keys);
dh->job = GNUNET_CURL_job_add2 (ctx,
eh,
dh->post_ctx.headers,
&handle_deposit_finished,
dh);
return dh;
}
void
TALER_EXCHANGE_batch_deposit_force_dc (
struct TALER_EXCHANGE_BatchDepositHandle *deposit)
{
deposit->auditor_chance = 1;
}
void
TALER_EXCHANGE_batch_deposit_cancel (
struct TALER_EXCHANGE_BatchDepositHandle *deposit)
{
struct TEAH_AuditorInteractionEntry *aie;
while (NULL != (aie = deposit->ai_head))
{
GNUNET_assert (aie->dh == deposit);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Not sending deposit confirmation to auditor `%s' due to cancellation\n",
aie->auditor_url);
TALER_AUDITOR_deposit_confirmation_cancel (aie->dch);
GNUNET_CONTAINER_DLL_remove (deposit->ai_head,
deposit->ai_tail,
aie);
GNUNET_free (aie);
}
if (NULL != deposit->job)
{
GNUNET_CURL_job_cancel (deposit->job);
deposit->job = NULL;
}
TALER_EXCHANGE_keys_decref (deposit->keys);
GNUNET_free (deposit->url);
GNUNET_free (deposit->cdds);
GNUNET_free (deposit->exchange_sigs);
TALER_curl_easy_post_finished (&deposit->post_ctx);
json_decref (deposit->response);
GNUNET_free (deposit);
}
/* end of exchange_api_batch_deposit.c */
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