/*
This file is part of TALER
(C) 2014-2020 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 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
*/
/**
* @file backend/taler-merchant-httpd_private-post-transfers.c
* @brief implement API for registering wire transfers
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include "taler-merchant-httpd_auditors.h"
#include "taler-merchant-httpd_exchanges.h"
#include "taler-merchant-httpd_private-post-transfers.h"
/**
* How long to wait before giving up processing with the exchange?
*/
#define TRANSFER_TIMEOUT (GNUNET_TIME_relative_multiply ( \
GNUNET_TIME_UNIT_SECONDS, \
30))
/**
* How often do we retry the simple INSERT database transaction?
*/
#define MAX_RETRIES 3
/**
* Context used for handing POST /private/transfers requests.
*/
struct PostTransfersContext
{
/**
* Kept in a DLL.
*/
struct PostTransfersContext *next;
/**
* Kept in a DLL.
*/
struct PostTransfersContext *prev;
/**
* Argument for the /wire/transfers request.
*/
struct TALER_WireTransferIdentifierRawP wtid;
/**
* Amount of the wire transfer.
*/
struct TALER_Amount amount;
/**
* URL of the exchange.
*/
const char *exchange_url;
/**
* payto:// URI used for the transfer.
*/
const char *payto_uri;
/**
* Master public key of the exchange at @e exchange_url.
*/
struct TALER_MasterPublicKeyP master_pub;
/**
* Handle for the /wire/transfers request.
*/
struct TALER_EXCHANGE_TransfersGetHandle *wdh;
/**
* For which merchant instance is this tracking request?
*/
struct TMH_HandlerContext *hc;
/**
* HTTP connection we are handling.
*/
struct MHD_Connection *connection;
/**
* Response to return upon resume.
*/
struct MHD_Response *response;
/**
* Handle for operation to lookup /keys (and auditors) from
* the exchange used for this transaction; NULL if no operation is
* pending.
*/
struct TMH_EXCHANGES_FindOperation *fo;
/**
* Task run on timeout.
*/
struct GNUNET_SCHEDULER_Task *timeout_task;
/**
* Pointer to the detail that we are currently
* checking in #check_transfer().
*/
const struct TALER_TrackTransferDetails *current_detail;
/**
* Which transaction detail are we currently looking at?
*/
unsigned int current_offset;
/**
* Response code to return.
*/
unsigned int response_code;
/**
* #GNUNET_NO if we did not find a matching coin.
* #GNUNET_SYSERR if we found a matching coin, but the amounts do not match.
* #GNUNET_OK if we did find a matching coin.
*/
int check_transfer_result;
};
/**
* Head of list of suspended requests.
*/
static struct PostTransfersContext *ptc_head;
/**
* Tail of list of suspended requests.
*/
static struct PostTransfersContext *ptc_tail;
/**
* We are shutting down, force resume of all POST /transfers requests.
*/
void
TMH_force_post_transfers_resume ()
{
struct PostTransfersContext *ptc;
while (NULL != (ptc = ptc_head))
{
GNUNET_CONTAINER_DLL_remove (ptc_head,
ptc_tail,
ptc);
MHD_resume_connection (ptc->connection);
if (NULL != ptc->timeout_task)
{
GNUNET_SCHEDULER_cancel (ptc->timeout_task);
ptc->timeout_task = NULL;
}
}
}
/**
* Resume the given /track/transfer operation and send the given response.
* Stores the response in the @a ptc and signals MHD to resume
* the connection. Also ensures MHD runs immediately.
*
* @param ptc transfer tracking context
* @param response_code response code to use
* @param response response data to send back
*/
static void
resume_transfer_with_response (struct PostTransfersContext *ptc,
unsigned int response_code,
struct MHD_Response *response)
{
ptc->response_code = response_code;
ptc->response = response;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Resuming POST /transfers handling as exchange interaction is done (%u)\n",
response_code);
if (NULL != ptc->timeout_task)
{
GNUNET_SCHEDULER_cancel (ptc->timeout_task);
ptc->timeout_task = NULL;
}
GNUNET_CONTAINER_DLL_remove (ptc_head,
ptc_tail,
ptc);
MHD_resume_connection (ptc->connection);
TMH_trigger_daemon (); /* we resumed, kick MHD */
}
/**
* Resume the given POST /transfers operation with an error.
*
* @param ptc transfer tracking context
* @param response_code response code to use
* @param ec error code to use
* @param hint hint text to provide
*/
static void
resume_transfer_with_error (struct PostTransfersContext *ptc,
unsigned int response_code,
enum TALER_ErrorCode ec,
const char *hint)
{
resume_transfer_with_response (ptc,
response_code,
TALER_MHD_make_error (ec,
hint));
}
/**
* Custom cleanup routine for a `struct PostTransfersContext`.
*
* @param cls the `struct PostTransfersContext` to clean up.
*/
static void
transfer_cleanup (void *cls)
{
struct PostTransfersContext *ptc = cls;
if (NULL != ptc->fo)
{
TMH_EXCHANGES_find_exchange_cancel (ptc->fo);
ptc->fo = NULL;
}
if (NULL != ptc->timeout_task)
{
GNUNET_SCHEDULER_cancel (ptc->timeout_task);
ptc->timeout_task = NULL;
}
if (NULL != ptc->wdh)
{
TALER_EXCHANGE_transfers_get_cancel (ptc->wdh);
ptc->wdh = NULL;
}
GNUNET_free (ptc);
}
/**
* This function checks that the information about the coin which
* was paid back by _this_ wire transfer matches what _we_ (the merchant)
* knew about this coin.
*
* @param cls closure with our `struct PostTransfersContext *`
* @param transaction_id of the contract
* @param exchange_url URL of the exchange that issued @a coin_pub
* @param amount_with_fee amount the exchange will transfer for this coin
* @param deposit_fee fee the exchange will charge for this coin
* @param refund_fee fee the exchange will charge for refunding this coin
* @param h_wire hash of merchant's wire details
* @param deposit_timestamp when did the exchange receive the deposit
* @param refund_deadline until when are refunds allowed
* @param exchange_sig signature by the exchange
* @param exchange_pub exchange signing key used for @a exchange_sig
*/
static void
check_transfer (void *cls,
const char *exchange_url,
const struct TALER_Amount *amount_with_fee,
const struct TALER_Amount *deposit_fee,
const struct TALER_Amount *refund_fee,
const struct TALER_Amount *wire_fee,
const struct GNUNET_HashCode *h_wire,
struct GNUNET_TIME_Absolute deposit_timestamp,
struct GNUNET_TIME_Absolute refund_deadline,
const struct TALER_ExchangeSignatureP *exchange_sig,
const struct TALER_ExchangePublicKeyP *exchange_pub)
{
struct PostTransfersContext *ptc = cls;
const struct TALER_TrackTransferDetails *ttd = ptc->current_detail;
if (GNUNET_SYSERR == ptc->check_transfer_result)
return; /* already had a serious issue; odd that we're called more than once as well... */
if ( (0 != TALER_amount_cmp (amount_with_fee,
&ttd->coin_value)) ||
(0 != TALER_amount_cmp (deposit_fee,
&ttd->coin_fee)) )
{
/* Disagreement between the exchange and us about how much this
coin is worth! */
GNUNET_break_op (0);
ptc->check_transfer_result = GNUNET_SYSERR;
/* Build the `TrackTransferConflictDetails` */
ptc->response_code = MHD_HTTP_ACCEPTED;
ptc->response
= TALER_MHD_make_json_pack (
"{s:I, s:s, s:s, s:o, s:o,"
" s:I, s:o, s:o, s:o, s:o,"
" s:o, s:o, s:o, s:o, s:o }",
"code",
(json_int_t) TALER_EC_POST_TRANSFERS_CONFLICTING_REPORTS,
"hint",
"disagreement about deposit valuation",
"exchange_url",
exchange_url,
"deposit_timestamp",
GNUNET_JSON_from_time_abs (deposit_timestamp),
"refund_deadline",
GNUNET_JSON_from_time_abs (refund_deadline),
/* first block of 5 */
"conflict_offset",
(json_int_t) ptc->current_offset,
"coin_pub",
GNUNET_JSON_from_data_auto (&ttd->coin_pub),
"h_wire",
GNUNET_JSON_from_data_auto (h_wire),
"deposit_exchange_sig",
GNUNET_JSON_from_data_auto (exchange_sig),
"deposit_exchange_pub",
GNUNET_JSON_from_data_auto (exchange_pub),
/* first block of 5 */
"h_contract_terms",
GNUNET_JSON_from_data_auto (&ttd->h_contract_terms),
"amount_with_fee",
TALER_JSON_from_amount (amount_with_fee),
"coin_value",
TALER_JSON_from_amount (&ttd->coin_value),
"coin_fee",
TALER_JSON_from_amount (&ttd->coin_fee),
"deposit_fee",
TALER_JSON_from_amount (deposit_fee));
return;
}
ptc->check_transfer_result = GNUNET_OK;
}
/**
* Check that the given @a wire_fee is what the @a exchange_pub should charge
* at the @a execution_time. If the fee is correct (according to our
* database), return #GNUNET_OK. If we do not have the fee structure in our
* DB, we just accept it and return #GNUNET_NO; if we have proof that the fee
* is bogus, we respond with the proof to the client and return
* #GNUNET_SYSERR.
*
* @param ptc context of the transfer to respond to
* @param execution_time time of the wire transfer
* @param wire_fee fee claimed by the exchange
* @return #GNUNET_SYSERR if we returned hard proof of
* missbehavior from the exchange to the client
*/
static int
check_wire_fee (struct PostTransfersContext *ptc,
struct GNUNET_TIME_Absolute execution_time,
const struct TALER_Amount *wire_fee)
{
struct TALER_Amount expected_fee;
struct TALER_Amount closing_fee;
struct TALER_MasterSignatureP master_sig;
struct GNUNET_TIME_Absolute start_date;
struct GNUNET_TIME_Absolute end_date;
enum GNUNET_DB_QueryStatus qs;
char *wire_method;
wire_method = TALER_payto_get_method (ptc->payto_uri);
TMH_db->preflight (TMH_db->cls);
qs = TMH_db->lookup_wire_fee (TMH_db->cls,
&ptc->master_pub,
wire_method,
execution_time,
&expected_fee,
&closing_fee,
&start_date,
&end_date,
&master_sig);
if (0 >= qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Failed to find wire fee for `%s' and method `%s' at %s in DB, accepting blindly that the fee is %s\n",
TALER_B2S (&ptc->master_pub),
wire_method,
GNUNET_STRINGS_absolute_time_to_string (execution_time),
TALER_amount2s (wire_fee));
GNUNET_free (wire_method);
return GNUNET_NO;
}
if (0 <= TALER_amount_cmp (&expected_fee,
wire_fee))
{
GNUNET_free (wire_method);
return GNUNET_OK; /* expected_fee >= wire_fee */
}
/* Wire fee check failed, export proof to client */
ptc->response_code = MHD_HTTP_ACCEPTED;
ptc->response =
TALER_MHD_make_json_pack (
"{s:I, s:s, s:o, s:o, s:o, s:o, s:o, s:o, s:o, s:o}",
"code", (json_int_t) TALER_EC_POST_TRANSFERS_JSON_BAD_WIRE_FEE,
"hint", "exchange provided conflicting wire fee information",
"wire_fee", TALER_JSON_from_amount (wire_fee),
"execution_time", GNUNET_JSON_from_time_abs (execution_time),
"expected_wire_fee", TALER_JSON_from_amount (&expected_fee),
"expected_closing_fee", TALER_JSON_from_amount (&closing_fee),
"start_date", GNUNET_JSON_from_time_abs (start_date),
"end_date", GNUNET_JSON_from_time_abs (end_date),
"master_sig", GNUNET_JSON_from_data_auto (&master_sig),
"master_pub", GNUNET_JSON_from_data_auto (&ptc->master_pub));
GNUNET_free (wire_method);
return GNUNET_SYSERR;
}
/**
* Function called with detailed wire transfer data, including all
* of the coin transactions that were combined into the wire transfer.
*
* @param cls closure
* @param hr HTTP response details
* @param td transfer data
*/
static void
wire_transfer_cb (void *cls,
const struct TALER_EXCHANGE_HttpResponse *hr,
const struct TALER_EXCHANGE_TransferData *td)
{
struct PostTransfersContext *ptc = cls;
const char *instance_id = ptc->hc->instance->settings.id;
enum GNUNET_DB_QueryStatus qs;
ptc->wdh = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Got response code %u from exchange for GET /transfers/$WTID\n",
hr->http_status);
if (MHD_HTTP_OK != hr->http_status)
{
resume_transfer_with_response (
ptc,
MHD_HTTP_FAILED_DEPENDENCY,
TALER_MHD_make_json_pack (
"{s:I, s:I, s:I, s:O}",
"code", (json_int_t) TALER_EC_POST_TRANSFERS_EXCHANGE_ERROR,
"exchange_code", (json_int_t) hr->ec,
"exchange_http_status", (json_int_t) hr->http_status,
"exchange_reply", hr->reply));
return;
}
for (unsigned int r = 0; rpreflight (TMH_db->cls);
if (GNUNET_OK !=
TMH_db->start (TMH_db->cls,
"insert transaction details"))
{
GNUNET_break (0);
resume_transfer_with_error (ptc,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_DB_STORE_TRANSFER_ERROR,
"could not start transaction");
return;
}
/* Ok, exchange answer is acceptable, store it */
qs = TMH_db->insert_transfer_details (TMH_db->cls,
instance_id,
ptc->exchange_url,
ptc->payto_uri,
&ptc->wtid,
td);
if (0 > qs)
goto retry;
qs = TMH_db->commit (TMH_db->cls);
retry:
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
TMH_db->rollback (TMH_db->cls);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
resume_transfer_with_error (
ptc,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_DB_STORE_TRANSFER_ERROR,
"failed to commit transaction to local database");
return;
}
if (0 <= qs)
break; /* success! */
}
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
{
TMH_db->rollback (TMH_db->cls);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
resume_transfer_with_error (
ptc,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_DB_STORE_TRANSFER_ERROR,
"repeated serialization failures trying to commit transaction to local database");
return;
}
/* resume processing, main function will build the response */
resume_transfer_with_response (ptc,
0,
NULL);
}
/**
* Function called with the result of our exchange lookup.
*
* @param cls the `struct PostTransfersContext`
* @param hr HTTP response details
* @param eh NULL if exchange was not found to be acceptable
* @param payto_uri payto://-URI of the exchange
* @param wire_fee NULL (we did not specify a wire method)
* @param exchange_trusted #GNUNET_YES if this exchange is trusted by config
*/
static void
process_transfer_with_exchange (void *cls,
const struct TALER_EXCHANGE_HttpResponse *hr,
struct TALER_EXCHANGE_Handle *eh,
const char *payto_uri,
const struct TALER_Amount *wire_fee,
bool exchange_trusted)
{
struct PostTransfersContext *ptc = cls;
(void) payto_uri;
(void) exchange_trusted;
ptc->fo = NULL;
if (MHD_HTTP_OK != hr->http_status)
{
/* The request failed somehow */
GNUNET_break_op (0);
resume_transfer_with_response (
ptc,
MHD_HTTP_FAILED_DEPENDENCY,
TALER_MHD_make_json_pack (
(NULL != hr->reply)
? "{s:s, s:I, s:I, s:I, s:O}"
: "{s:s, s:I, s:I, s:I}",
"hint", "failed to obtain meta-data from exchange",
"code", (json_int_t) TALER_EC_POST_TRANSFERS_EXCHANGE_KEYS_FAILURE,
"exchange_http_status", (json_int_t) hr->http_status,
"exchange_code", (json_int_t) hr->ec,
"exchange_reply", hr->reply));
return;
}
/* keep master key for later */
{
const struct TALER_EXCHANGE_Keys *keys;
keys = TALER_EXCHANGE_get_keys (eh);
if (NULL == keys)
{
GNUNET_break (0);
resume_transfer_with_error (ptc,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_EXCHANGE_KEYS_FAILURE,
"failed to get keys");
return;
}
ptc->master_pub = keys->master_pub;
}
ptc->wdh = TALER_EXCHANGE_transfers_get (eh,
&ptc->wtid,
&wire_transfer_cb,
ptc);
if (NULL == ptc->wdh)
{
GNUNET_break (0);
resume_transfer_with_error (ptc,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_REQUEST_ERROR,
"failed to run GET /transfers/ on exchange");
}
}
/**
* Now we want to double-check that any (Taler coin) deposit which is
* accounted into _this_ wire transfer, does exist into _our_ database. This
* is the rationale: if the exchange paid us for it, we must have received it
* _beforehands_!
*
* @param cls a `struct PostTransfersContext`
* @param current_offset at which offset in the exchange's reply are the @a ttd
* @param ttd details about an aggregated transfer (to check)
*/
static void
verify_exchange_claim_cb (void *cls,
unsigned int current_offset,
const struct TALER_TrackTransferDetails *ttd)
{
struct PostTransfersContext *ptc = cls;
enum GNUNET_DB_QueryStatus qs;
if (0 != ptc->response_code)
return; /* already encountered an error */
ptc->current_offset = current_offset;
ptc->current_detail = ttd;
/* Set the coin as "never seen" before. */
ptc->check_transfer_result = GNUNET_NO;
TMH_db->preflight (TMH_db->cls);
qs = TMH_db->lookup_deposits_by_contract_and_coin (
TMH_db->cls,
ptc->hc->instance->settings.id,
&ttd->h_contract_terms,
&ttd->coin_pub,
&check_transfer,
ptc);
if (0 > qs)
{
/* single, read-only SQL statements should never cause
serialization problems */
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
ptc->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
ptc->response
= TALER_MHD_make_error (TALER_EC_POST_TRANSFERS_DB_FETCH_DEPOSIT_ERROR,
"failed to obtain deposit data from local database");
return;
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
/* The exchange says we made this deposit, but WE do not
recall making it (corrupted / unreliable database?)!
Well, let's say thanks and accept the money! */
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Failed to find payment data in DB\n");
ptc->check_transfer_result = GNUNET_OK;
}
if (GNUNET_NO == ptc->check_transfer_result)
{
/* Internal error: how can we have called #check_transfer()
but still have no result? */
GNUNET_break (0);
ptc->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
ptc->response =
TALER_MHD_make_error (TALER_EC_POST_TRANSFERS_DB_INTERNAL_LOGIC_ERROR,
"internal logic error");
return;
}
if (GNUNET_SYSERR == ptc->check_transfer_result)
{
/* #check_transfer() failed, report conflict! */
GNUNET_break_op (0);
GNUNET_assert (NULL != ptc->response);
return;
}
}
/**
* Represents an entry in the table used to sum up
* individual deposits for each h_contract_terms/order_id
* (as the exchange gives us per coin, and we return
* per order).
*/
struct Entry
{
/**
* Order of the entry.
*/
char *order_id;
/**
* Sum accumulator for deposited value.
*/
struct TALER_Amount deposit_value;
/**
* Sum accumulator for deposit fee.
*/
struct TALER_Amount deposit_fee;
};
/**
* Function called with information about a wire transfer identifier.
* Generate a response array based on the given information.
*
* @param cls closure, a hashmap to update
* @param order_id the order to which the deposits belong
* @param deposit_value the amount deposited under @a order_id
* @param deposit_fee the fee charged for @a deposit_value
*/
static void
transfer_summary_cb (void *cls,
const char *order_id,
const struct TALER_Amount *deposit_value,
const struct TALER_Amount *deposit_fee)
{
struct GNUNET_CONTAINER_MultiHashMap *map = cls;
struct Entry *current_entry;
struct GNUNET_HashCode h_key;
GNUNET_CRYPTO_hash_from_string (order_id,
&h_key);
current_entry = GNUNET_CONTAINER_multihashmap_get (map,
&h_key);
if (NULL != current_entry)
{
/* The map already knows this order, do aggregation */
GNUNET_assert ( (0 <=
TALER_amount_add (¤t_entry->deposit_value,
¤t_entry->deposit_value,
deposit_value)) &&
(0 <=
TALER_amount_add (¤t_entry->deposit_fee,
¤t_entry->deposit_fee,
deposit_fee)) );
}
else
{
/* First time in the map for this h_contract_terms*/
current_entry = GNUNET_new (struct Entry);
current_entry->deposit_value = *deposit_value;
current_entry->deposit_fee = *deposit_fee;
current_entry->order_id = GNUNET_strdup (order_id);
GNUNET_assert (GNUNET_SYSERR !=
GNUNET_CONTAINER_multihashmap_put (map,
&h_key,
current_entry,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
}
}
/**
* Callback that frees all the elements in the hashmap, and @a cls
* is non-NULL, appends them as JSON to the array
*
* @param cls closure, NULL or a `json_t *` array
* @param key current key
* @param value a `struct Entry`
* @return #GNUNET_YES if the iteration should continue,
* #GNUNET_NO otherwise.
*/
static int
hashmap_free (void *cls,
const struct GNUNET_HashCode *key,
void *value)
{
json_t *ja = cls;
struct Entry *entry = value;
(void) key;
if (NULL != ja)
{
GNUNET_assert (
0 ==
json_array_append_new (
ja,
json_pack ("{s:s,s:o,s:o}",
"order_id",
entry->order_id,
"deposit_value",
TALER_JSON_from_amount (&entry->deposit_value),
"deposit_fee",
TALER_JSON_from_amount (&entry->deposit_fee))));
}
GNUNET_free (entry->order_id);
GNUNET_free (entry);
return GNUNET_YES;
}
/**
* Handle a timeout for the processing of the track transfer request.
*
* @param cls closure
*/
static void
handle_transfer_timeout (void *cls)
{
struct PostTransfersContext *ptc = cls;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Resuming POST /private/transfers with error after timeout\n");
ptc->timeout_task = NULL;
if (NULL != ptc->fo)
{
TMH_EXCHANGES_find_exchange_cancel (ptc->fo);
ptc->fo = NULL;
}
if (NULL != ptc->wdh)
{
TALER_EXCHANGE_transfers_get_cancel (ptc->wdh);
ptc->wdh = NULL;
}
resume_transfer_with_error (ptc,
MHD_HTTP_SERVICE_UNAVAILABLE,
TALER_EC_POST_TRANSFERS_EXCHANGE_TIMEOUT,
"exchange not reachable");
}
/**
* Manages a POST /private/transfers call. It calls the GET /transfers/$WTID
* offered by the exchange in order to obtain the set of transfers
* (of coins) associated with a given wire transfer.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] hc context with further information about the request
* @return MHD result code
*/
MHD_RESULT
TMH_private_post_transfers (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc)
{
struct PostTransfersContext *ptc = hc->ctx;
enum GNUNET_DB_QueryStatus qs;
if (NULL == ptc)
{
ptc = GNUNET_new (struct PostTransfersContext);
ptc->connection = connection;
ptc->hc = hc;
hc->ctx = ptc;
hc->cc = &transfer_cleanup;
}
queue:
if (0 != ptc->response_code)
{
MHD_RESULT ret;
/* We are *done* processing the request, just queue the response (!) */
if (UINT_MAX == ptc->response_code)
{
GNUNET_break (0);
return MHD_NO; /* hard error */
}
ret = MHD_queue_response (connection,
ptc->response_code,
ptc->response);
if (NULL != ptc->response)
{
MHD_destroy_response (ptc->response);
ptc->response = NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Queueing response (%u) for POST /private/transfers (%s).\n",
(unsigned int) ptc->response_code,
ret ? "OK" : "FAILED");
return ret;
}
if ( (NULL != ptc->fo) ||
(NULL != ptc->wdh) )
{
/* likely old MHD version */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Not sure why we are here, should be suspended\n");
return MHD_YES; /* still work in progress */
}
if (NULL == ptc->exchange_url)
{
/* First request, parse it! */
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount ("credit_amount",
&ptc->amount),
GNUNET_JSON_spec_fixed_auto ("wtid",
&ptc->wtid),
GNUNET_JSON_spec_string ("payto_uri",
&ptc->payto_uri),
GNUNET_JSON_spec_string ("exchange_url",
&ptc->exchange_url),
GNUNET_JSON_spec_end ()
};
{
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (connection,
hc->request_body,
spec);
if (GNUNET_OK != res)
return (GNUNET_NO == res)
? MHD_YES
: MHD_NO;
}
}
/* Check if transfer data is in database! */
{
struct GNUNET_TIME_Absolute execution_time;
struct TALER_Amount total_amount;
struct TALER_Amount wire_fee;
bool verified;
TMH_db->preflight (TMH_db->cls);
qs = TMH_db->lookup_transfer (TMH_db->cls,
ptc->exchange_url,
&ptc->wtid,
&total_amount,
&wire_fee,
&execution_time,
&verified);
if (0 > qs)
{
/* Simple select queries should not cause serialization issues */
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_DB_LOOKUP_ERROR,
"Failed to query database about transfer details");
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
goto fetch;
if (! verified)
{
if (GNUNET_SYSERR ==
check_wire_fee (ptc,
execution_time,
&wire_fee))
{
GNUNET_assert (0 != ptc->response_code);
goto queue;
}
qs = TMH_db->lookup_transfer_details (TMH_db->cls,
ptc->exchange_url,
&ptc->wtid,
&verify_exchange_claim_cb,
ptc);
if (0 != ptc->response_code)
goto queue;
verified = true;
qs = TMH_db->set_transfer_status_to_verified (TMH_db->cls,
ptc->exchange_url,
&ptc->wtid);
GNUNET_break (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs);
}
/* Short version: we already verified, generate the summary response */
GNUNET_assert (verified);
{
struct GNUNET_CONTAINER_MultiHashMap *map;
json_t *deposit_sums;
map = GNUNET_CONTAINER_multihashmap_create (16,
GNUNET_NO);
qs = TMH_db->lookup_transfer_summary (TMH_db->cls,
ptc->exchange_url,
&ptc->wtid,
&transfer_summary_cb,
map);
if (0 > qs)
{
/* Simple select queries should not cause serialization issues */
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
GNUNET_CONTAINER_multihashmap_iterate (map,
&hashmap_free,
NULL);
GNUNET_CONTAINER_multihashmap_destroy (map);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_DB_LOOKUP_ERROR,
"Failed to query database about transfer details");
}
deposit_sums = json_array ();
GNUNET_assert (NULL != deposit_sums);
GNUNET_CONTAINER_multihashmap_iterate (map,
&hashmap_free,
deposit_sums);
GNUNET_CONTAINER_multihashmap_destroy (map);
return TALER_MHD_reply_json_pack (
connection,
MHD_HTTP_OK,
"{s:o,s:o,s:o,s:o}",
"total", TALER_JSON_from_amount (&total_amount),
"wire_fee", TALER_JSON_from_amount (&wire_fee),
"execution_time", GNUNET_JSON_from_time_abs (execution_time),
"deposit_sums", deposit_sums);
} /* end of 'verified == true' */
} /* end of 'transfer data in database' */
/* reply not in database, ensure the POST is in the database, and
start work to obtain the reply from the exchange */
fetch:
qs = TMH_db->insert_transfer (TMH_db->cls,
ptc->hc->instance->settings.id,
ptc->exchange_url,
&ptc->wtid,
&ptc->amount,
ptc->payto_uri,
true /* confirmed! */);
if (0 > qs)
{
/* Simple select queries should not cause serialization issues */
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
/* Always report on hard error as well to enable diagnostics */
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_POST_TRANSFERS_DB_STORE_ERROR,
"Fail to update database with transfer record");
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
uint64_t account_serial;
/* Either the record already exists (we should ignore this), or
the INSERT failed because we did not find the account based on
the given payto-URI and the instance. */
qs = TMH_db->lookup_account (TMH_db->cls,
ptc->hc->instance->settings.id,
ptc->payto_uri,
&account_serial);
if (0 >= qs)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_POST_TRANSFERS_ACCOUNT_NOT_FOUND,
"Instance does not have this bank account");
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Suspending POST /private/transfers handling while working with exchange\n");
MHD_suspend_connection (connection);
GNUNET_CONTAINER_DLL_insert (ptc_head,
ptc_tail,
ptc);
ptc->fo = TMH_EXCHANGES_find_exchange (ptc->exchange_url,
NULL,
GNUNET_NO,
&process_transfer_with_exchange,
ptc);
ptc->timeout_task
= GNUNET_SCHEDULER_add_delayed (TRANSFER_TIMEOUT,
&handle_transfer_timeout,
ptc);
return MHD_YES;
}
/* end of taler-merchant-httpd_private-post-transfers.c */