taler-exchange-httpd_post-purses-PURSE_PUB-create.c (24607B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU Affero General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. 12 13 You should have received a copy of the GNU Affero General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file taler-exchange-httpd_post-purses-PURSE_PUB-create.c 18 * @brief Handle /purses/$PID/create requests; parses the POST and JSON and 19 * verifies the coin signature before handing things off 20 * to the database. 21 * @author Christian Grothoff 22 */ 23 #include <gnunet/gnunet_util_lib.h> 24 #include <gnunet/gnunet_json_lib.h> 25 #include <jansson.h> 26 #include <microhttpd.h> 27 #include "taler/taler_json_lib.h" 28 #include "taler/taler_mhd_lib.h" 29 #include "taler-exchange-httpd_common_deposit.h" 30 #include "taler-exchange-httpd_post-purses-PURSE_PUB-create.h" 31 #include "taler-exchange-httpd_responses.h" 32 #include "exchangedb_lib.h" 33 #include "taler-exchange-httpd_get-keys.h" 34 #include "exchange-database/get_contract_by_purse.h" 35 #include "exchange-database/do_purse_deposit.h" 36 #include "exchange-database/get_purse_deposit.h" 37 #include "exchange-database/get_purse_request.h" 38 #include "exchange-database/insert_contract.h" 39 #include "exchange-database/insert_purse_request.h" 40 #include "exchange-database/preflight.h" 41 #include "exchange-database/rollback.h" 42 43 44 /** 45 * Closure for #create_transaction. 46 */ 47 struct PurseCreateContext 48 { 49 50 /** 51 * Total actually deposited by all the coins. 52 */ 53 struct TALER_Amount deposit_total; 54 55 /** 56 * Our current time. 57 */ 58 struct GNUNET_TIME_Timestamp exchange_timestamp; 59 60 /** 61 * Merge key for the purse. 62 */ 63 struct TALER_PurseMergePublicKeyP merge_pub; 64 65 /** 66 * Encrypted contract of for the purse. 67 */ 68 struct TALER_EncryptedContract econtract; 69 70 /** 71 * Signature of the client affiming this request. 72 */ 73 struct TALER_PurseContractSignatureP purse_sig; 74 75 /** 76 * Fundamental details about the purse. 77 */ 78 struct TEH_PurseDetails pd; 79 80 /** 81 * Array of coins being deposited. 82 */ 83 struct TEH_PurseDepositedCoin *coins; 84 85 /** 86 * Length of the @e coins array. 87 */ 88 unsigned int num_coins; 89 90 /** 91 * Minimum age for deposits into this purse. 92 */ 93 uint32_t min_age; 94 95 /** 96 * Do we have an @e econtract? 97 */ 98 bool no_econtract; 99 100 }; 101 102 103 /** 104 * Execute database transaction for /purses/$PID/create. Runs the transaction 105 * logic; IF it returns a non-error code, the transaction logic MUST NOT queue 106 * a MHD response. IF it returns an hard error, the transaction logic MUST 107 * queue a MHD response and set @a mhd_ret. IF it returns the soft error 108 * code, the function MAY be called again to retry and MUST not queue a MHD 109 * response. 110 * 111 * @param cls a `struct PurseCreateContext` 112 * @param connection MHD request context 113 * @param[out] mhd_ret set to MHD status on error 114 * @return transaction status 115 */ 116 static enum GNUNET_DB_QueryStatus 117 create_transaction (void *cls, 118 struct MHD_Connection *connection, 119 enum MHD_Result *mhd_ret) 120 { 121 struct PurseCreateContext *pcc = cls; 122 enum GNUNET_DB_QueryStatus qs; 123 struct TALER_Amount purse_fee; 124 bool in_conflict = true; 125 126 GNUNET_assert (GNUNET_OK == 127 TALER_amount_set_zero (TEH_currency, 128 &purse_fee)); 129 /* 1) create purse */ 130 qs = TALER_EXCHANGEDB_insert_purse_request ( 131 TEH_pg, 132 &pcc->pd.purse_pub, 133 &pcc->merge_pub, 134 pcc->pd.purse_expiration, 135 &pcc->pd.h_contract_terms, 136 pcc->min_age, 137 TALER_WAMF_MODE_MERGE_FULLY_PAID_PURSE, 138 &purse_fee, 139 &pcc->pd.target_amount, 140 &pcc->purse_sig, 141 &in_conflict); 142 if (qs < 0) 143 { 144 if (GNUNET_DB_STATUS_SOFT_ERROR == qs) 145 return qs; 146 TALER_LOG_WARNING ( 147 "Failed to store create purse information in database\n"); 148 *mhd_ret = 149 TALER_MHD_reply_with_error (connection, 150 MHD_HTTP_INTERNAL_SERVER_ERROR, 151 TALER_EC_GENERIC_DB_STORE_FAILED, 152 "purse create"); 153 return GNUNET_DB_STATUS_HARD_ERROR; 154 } 155 if (in_conflict) 156 { 157 struct TALER_PurseMergePublicKeyP merge_pub; 158 struct GNUNET_TIME_Timestamp purse_expiration; 159 struct TALER_PrivateContractHashP h_contract_terms; 160 struct TALER_Amount target_amount; 161 struct TALER_Amount balance; 162 struct TALER_PurseContractSignatureP purse_sig; 163 uint32_t min_age; 164 165 TALER_EXCHANGEDB_rollback (TEH_pg); 166 qs = TALER_EXCHANGEDB_get_purse_request (TEH_pg, 167 &pcc->pd.purse_pub, 168 &merge_pub, 169 &purse_expiration, 170 &h_contract_terms, 171 &min_age, 172 &target_amount, 173 &balance, 174 &purse_sig); 175 if (qs < 0) 176 { 177 GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs); 178 TALER_LOG_WARNING ("Failed to fetch purse information from database\n"); 179 *mhd_ret = TALER_MHD_reply_with_error (connection, 180 MHD_HTTP_INTERNAL_SERVER_ERROR, 181 TALER_EC_GENERIC_DB_FETCH_FAILED, 182 "select purse request"); 183 return GNUNET_DB_STATUS_HARD_ERROR; 184 } 185 *mhd_ret 186 = TALER_MHD_REPLY_JSON_PACK ( 187 connection, 188 MHD_HTTP_CONFLICT, 189 TALER_JSON_pack_ec ( 190 TALER_EC_EXCHANGE_PURSE_CREATE_CONFLICTING_META_DATA), 191 TALER_JSON_pack_amount ("amount", 192 &target_amount), 193 GNUNET_JSON_pack_uint64 ("min_age", 194 min_age), 195 GNUNET_JSON_pack_timestamp ("purse_expiration", 196 purse_expiration), 197 GNUNET_JSON_pack_data_auto ("purse_sig", 198 &purse_sig), 199 GNUNET_JSON_pack_data_auto ("h_contract_terms", 200 &h_contract_terms), 201 GNUNET_JSON_pack_data_auto ("merge_pub", 202 &merge_pub)); 203 return GNUNET_DB_STATUS_HARD_ERROR; 204 } 205 /* 2) deposit all coins */ 206 for (unsigned int i = 0; i<pcc->num_coins; i++) 207 { 208 struct TEH_PurseDepositedCoin *coin = &pcc->coins[i]; 209 bool balance_ok = false; 210 bool conflict = true; 211 bool too_late = true; 212 213 qs = TEH_make_coin_known (&coin->cpi, 214 connection, 215 &coin->known_coin_id, 216 mhd_ret); 217 if (qs < 0) 218 return qs; 219 qs = TALER_EXCHANGEDB_do_purse_deposit (TEH_pg, 220 &pcc->pd.purse_pub, 221 &coin->cpi.coin_pub, 222 &coin->amount, 223 &coin->coin_sig, 224 &coin->amount_minus_fee, 225 &balance_ok, 226 &too_late, 227 &conflict); 228 if (qs <= 0) 229 { 230 if (GNUNET_DB_STATUS_SOFT_ERROR == qs) 231 return qs; 232 GNUNET_break (0 != qs); 233 TALER_LOG_WARNING ( 234 "Failed to store purse deposit information in database\n"); 235 *mhd_ret = TALER_MHD_reply_with_error (connection, 236 MHD_HTTP_INTERNAL_SERVER_ERROR, 237 TALER_EC_GENERIC_DB_STORE_FAILED, 238 "purse create deposit"); 239 return GNUNET_DB_STATUS_HARD_ERROR; 240 } 241 if (! balance_ok) 242 { 243 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, 244 "Coin %s has insufficient balance for purse deposit of amount %s\n", 245 TALER_B2S (&coin->cpi.coin_pub), 246 TALER_amount2s (&coin->amount)); 247 *mhd_ret 248 = TEH_RESPONSE_reply_coin_insufficient_funds ( 249 connection, 250 TALER_EC_EXCHANGE_GENERIC_INSUFFICIENT_FUNDS, 251 &coin->cpi.denom_pub_hash, 252 &coin->cpi.coin_pub); 253 return GNUNET_DB_STATUS_HARD_ERROR; 254 } 255 if (too_late) 256 { 257 *mhd_ret 258 = TALER_MHD_reply_with_ec ( 259 connection, 260 TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE, 261 "too late to deposit on purse creation"); 262 return GNUNET_DB_STATUS_HARD_ERROR; 263 } 264 if (conflict) 265 { 266 struct TALER_Amount amount; 267 struct TALER_CoinSpendSignatureP coin_sig; 268 struct TALER_DenominationHashP h_denom_pub; 269 struct TALER_AgeCommitmentHashP hac; 270 const struct TALER_AgeCommitmentHashP *phac = NULL; 271 bool no_age_commitment; 272 char *partner_url = NULL; 273 274 TALER_EXCHANGEDB_rollback (TEH_pg); 275 qs = TALER_EXCHANGEDB_get_purse_deposit (TEH_pg, 276 &pcc->pd.purse_pub, 277 &coin->cpi.coin_pub, 278 &amount, 279 &h_denom_pub, 280 &hac, 281 &no_age_commitment, 282 &coin_sig, 283 &partner_url); 284 if (qs < 0) 285 { 286 GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs); 287 TALER_LOG_WARNING ( 288 "Failed to fetch purse deposit information from database\n"); 289 *mhd_ret = TALER_MHD_reply_with_error (connection, 290 MHD_HTTP_INTERNAL_SERVER_ERROR, 291 TALER_EC_GENERIC_DB_FETCH_FAILED, 292 "get purse deposit"); 293 return GNUNET_DB_STATUS_HARD_ERROR; 294 } 295 if (! no_age_commitment) 296 phac = &hac; 297 298 *mhd_ret 299 = TALER_MHD_REPLY_JSON_PACK ( 300 connection, 301 MHD_HTTP_CONFLICT, 302 TALER_JSON_pack_ec ( 303 TALER_EC_EXCHANGE_PURSE_DEPOSIT_CONFLICTING_META_DATA), 304 GNUNET_JSON_pack_data_auto ("coin_pub", 305 &coin->cpi.coin_pub), 306 GNUNET_JSON_pack_data_auto ("coin_sig", 307 &coin_sig), 308 GNUNET_JSON_pack_data_auto ("h_denom_pub", 309 &h_denom_pub), 310 GNUNET_JSON_pack_allow_null ( 311 GNUNET_JSON_pack_data_auto ("h_age_restrictions", 312 phac)), 313 GNUNET_JSON_pack_allow_null ( 314 GNUNET_JSON_pack_string ("partner_url", 315 partner_url)), 316 TALER_JSON_pack_amount ("amount", 317 &amount)); 318 GNUNET_free (partner_url); 319 return GNUNET_DB_STATUS_HARD_ERROR; 320 } 321 } 322 /* 3) if present, persist contract */ 323 if (! pcc->no_econtract) 324 { 325 in_conflict = true; 326 qs = TALER_EXCHANGEDB_insert_contract (TEH_pg, 327 &pcc->pd.purse_pub, 328 &pcc->econtract, 329 &in_conflict); 330 if (qs < 0) 331 { 332 if (GNUNET_DB_STATUS_SOFT_ERROR == qs) 333 return qs; 334 TALER_LOG_WARNING ("Failed to store purse information in database\n"); 335 *mhd_ret = TALER_MHD_reply_with_error (connection, 336 MHD_HTTP_INTERNAL_SERVER_ERROR, 337 TALER_EC_GENERIC_DB_STORE_FAILED, 338 "purse create contract"); 339 return GNUNET_DB_STATUS_HARD_ERROR; 340 } 341 if (in_conflict) 342 { 343 struct TALER_EncryptedContract econtract; 344 struct GNUNET_HashCode h_econtract; 345 346 qs = TALER_EXCHANGEDB_get_contract_by_purse ( 347 TEH_pg, 348 &pcc->pd.purse_pub, 349 &econtract); 350 if (qs <= 0) 351 { 352 if (GNUNET_DB_STATUS_SOFT_ERROR == qs) 353 return qs; 354 GNUNET_break (0 != qs); 355 TALER_LOG_WARNING ( 356 "Failed to store fetch contract information from database\n"); 357 *mhd_ret = TALER_MHD_reply_with_error (connection, 358 MHD_HTTP_INTERNAL_SERVER_ERROR, 359 TALER_EC_GENERIC_DB_FETCH_FAILED, 360 "select contract"); 361 return GNUNET_DB_STATUS_HARD_ERROR; 362 } 363 GNUNET_CRYPTO_hash (econtract.econtract, 364 econtract.econtract_size, 365 &h_econtract); 366 *mhd_ret 367 = TALER_MHD_REPLY_JSON_PACK ( 368 connection, 369 MHD_HTTP_CONFLICT, 370 TALER_JSON_pack_ec ( 371 TALER_EC_EXCHANGE_PURSE_ECONTRACT_CONFLICTING_META_DATA), 372 GNUNET_JSON_pack_data_auto ("h_econtract", 373 &h_econtract), 374 GNUNET_JSON_pack_data_auto ("econtract_sig", 375 &econtract.econtract_sig), 376 GNUNET_JSON_pack_data_auto ("contract_pub", 377 &econtract.contract_pub)); 378 GNUNET_free (econtract.econtract); 379 return GNUNET_DB_STATUS_HARD_ERROR; 380 } 381 } 382 return qs; 383 } 384 385 386 /** 387 * Parse a coin and check signature of the coin and the denomination 388 * signature over the coin. 389 * 390 * @param[in,out] connection our HTTP connection 391 * @param[in,out] pcc request context 392 * @param[out] coin coin to initialize 393 * @param jcoin coin to parse 394 * @return #GNUNET_OK on success, #GNUNET_NO if an error was returned, 395 * #GNUNET_SYSERR on failure and no error could be returned 396 */ 397 static enum GNUNET_GenericReturnValue 398 parse_coin (struct MHD_Connection *connection, 399 struct PurseCreateContext *pcc, 400 struct TEH_PurseDepositedCoin *coin, 401 const json_t *jcoin) 402 { 403 enum GNUNET_GenericReturnValue iret; 404 405 if (GNUNET_OK != 406 (iret = TEH_common_purse_deposit_parse_coin (connection, 407 coin, 408 jcoin))) 409 return iret; 410 if (GNUNET_OK != 411 (iret = TEH_common_deposit_check_purse_deposit ( 412 connection, 413 coin, 414 &pcc->pd.purse_pub, 415 pcc->min_age))) 416 return iret; 417 if (0 > 418 TALER_amount_add (&pcc->deposit_total, 419 &pcc->deposit_total, 420 &coin->amount_minus_fee)) 421 { 422 GNUNET_break (0); 423 return (MHD_YES == 424 TALER_MHD_reply_with_error (connection, 425 MHD_HTTP_INTERNAL_SERVER_ERROR, 426 TALER_EC_GENERIC_FAILED_COMPUTE_AMOUNT, 427 "total deposit contribution")) 428 ? GNUNET_NO 429 : GNUNET_SYSERR; 430 } 431 return GNUNET_OK; 432 } 433 434 435 enum MHD_Result 436 TEH_handler_purses_create ( 437 struct TEH_RequestContext *rc, 438 const struct TALER_PurseContractPublicKeyP *purse_pub, 439 const json_t *root) 440 { 441 struct MHD_Connection *connection = rc->connection; 442 struct PurseCreateContext pcc = { 443 .pd.purse_pub = *purse_pub, 444 .exchange_timestamp = GNUNET_TIME_timestamp_get () 445 }; 446 const json_t *deposits; 447 json_t *deposit; 448 unsigned int idx; 449 struct GNUNET_JSON_Specification spec[] = { 450 TALER_JSON_spec_amount ("amount", 451 TEH_currency, 452 &pcc.pd.target_amount), 453 GNUNET_JSON_spec_uint32 ("min_age", 454 &pcc.min_age), 455 GNUNET_JSON_spec_mark_optional ( 456 TALER_JSON_spec_econtract ("econtract", 457 &pcc.econtract), 458 &pcc.no_econtract), 459 GNUNET_JSON_spec_fixed_auto ("merge_pub", 460 &pcc.merge_pub), 461 GNUNET_JSON_spec_fixed_auto ("purse_sig", 462 &pcc.purse_sig), 463 GNUNET_JSON_spec_fixed_auto ("h_contract_terms", 464 &pcc.pd.h_contract_terms), 465 GNUNET_JSON_spec_array_const ("deposits", 466 &deposits), 467 GNUNET_JSON_spec_timestamp ("purse_expiration", 468 &pcc.pd.purse_expiration), 469 GNUNET_JSON_spec_end () 470 }; 471 const struct TEH_GlobalFee *gf; 472 473 { 474 enum GNUNET_GenericReturnValue res; 475 476 res = TALER_MHD_parse_json_data (connection, 477 root, 478 spec); 479 if (GNUNET_SYSERR == res) 480 { 481 GNUNET_break (0); 482 return MHD_NO; /* hard failure */ 483 } 484 if (GNUNET_NO == res) 485 { 486 GNUNET_break_op (0); 487 return MHD_YES; /* failure */ 488 } 489 } 490 GNUNET_assert (GNUNET_OK == 491 TALER_amount_set_zero (TEH_currency, 492 &pcc.deposit_total)); 493 if (GNUNET_TIME_timestamp_cmp (pcc.pd.purse_expiration, 494 <, 495 pcc.exchange_timestamp)) 496 { 497 GNUNET_break_op (0); 498 GNUNET_JSON_parse_free (spec); 499 return TALER_MHD_reply_with_error (connection, 500 MHD_HTTP_BAD_REQUEST, 501 TALER_EC_EXCHANGE_PURSE_CREATE_EXPIRATION_BEFORE_NOW, 502 NULL); 503 } 504 if (GNUNET_TIME_absolute_is_never (pcc.pd.purse_expiration.abs_time)) 505 { 506 GNUNET_break_op (0); 507 GNUNET_JSON_parse_free (spec); 508 return TALER_MHD_reply_with_error (connection, 509 MHD_HTTP_BAD_REQUEST, 510 TALER_EC_EXCHANGE_PURSE_CREATE_EXPIRATION_IS_NEVER, 511 NULL); 512 } 513 pcc.num_coins = json_array_size (deposits); 514 if ( (0 == pcc.num_coins) || 515 (pcc.num_coins > TALER_MAX_COINS) ) 516 { 517 GNUNET_break_op (0); 518 GNUNET_JSON_parse_free (spec); 519 return TALER_MHD_reply_with_error (connection, 520 MHD_HTTP_BAD_REQUEST, 521 TALER_EC_GENERIC_PARAMETER_MALFORMED, 522 "deposits"); 523 } 524 { 525 struct TEH_KeyStateHandle *keys; 526 527 keys = TEH_keys_get_state (); 528 if (NULL == keys) 529 { 530 GNUNET_break (0); 531 GNUNET_JSON_parse_free (spec); 532 return TALER_MHD_reply_with_error (connection, 533 MHD_HTTP_INTERNAL_SERVER_ERROR, 534 TALER_EC_EXCHANGE_GENERIC_KEYS_MISSING, 535 NULL); 536 } 537 gf = TEH_keys_global_fee_by_time (keys, 538 pcc.exchange_timestamp); 539 } 540 if (NULL == gf) 541 { 542 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, 543 "Cannot create purse: global fees not configured!\n"); 544 GNUNET_JSON_parse_free (spec); 545 return TALER_MHD_reply_with_error (connection, 546 MHD_HTTP_INTERNAL_SERVER_ERROR, 547 TALER_EC_EXCHANGE_GENERIC_GLOBAL_FEES_MISSING, 548 NULL); 549 } 550 /* parse deposits */ 551 pcc.coins = GNUNET_new_array (pcc.num_coins, 552 struct TEH_PurseDepositedCoin); 553 json_array_foreach (deposits, idx, deposit) 554 { 555 enum GNUNET_GenericReturnValue res; 556 struct TEH_PurseDepositedCoin *coin = &pcc.coins[idx]; 557 558 res = parse_coin (connection, 559 &pcc, 560 coin, 561 deposit); 562 if (GNUNET_OK != res) 563 { 564 /* Note: coins[idx] may have been fully parsed before the 565 check failed, so it must be released as well. */ 566 for (unsigned int i = 0; i<=idx; i++) 567 TEH_common_purse_deposit_free_coin (&pcc.coins[i]); 568 GNUNET_free (pcc.coins); 569 GNUNET_JSON_parse_free (spec); 570 return (GNUNET_NO == res) ? MHD_YES : MHD_NO; 571 } 572 } 573 574 if (0 < TALER_amount_cmp (&gf->fees.purse, 575 &pcc.deposit_total)) 576 { 577 GNUNET_break_op (0); 578 for (unsigned int i = 0; i<pcc.num_coins; i++) 579 TEH_common_purse_deposit_free_coin (&pcc.coins[i]); 580 GNUNET_free (pcc.coins); 581 GNUNET_JSON_parse_free (spec); 582 return TALER_MHD_reply_with_error (connection, 583 MHD_HTTP_BAD_REQUEST, 584 TALER_EC_EXCHANGE_CREATE_PURSE_NEGATIVE_VALUE_AFTER_FEE, 585 NULL); 586 } 587 TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++; 588 589 if (GNUNET_OK != 590 TALER_wallet_purse_create_verify ( 591 pcc.pd.purse_expiration, 592 &pcc.pd.h_contract_terms, 593 &pcc.merge_pub, 594 pcc.min_age, 595 &pcc.pd.target_amount, 596 &pcc.pd.purse_pub, 597 &pcc.purse_sig)) 598 { 599 TALER_LOG_WARNING ("Invalid signature on /purses/$PID/create request\n"); 600 for (unsigned int i = 0; i<pcc.num_coins; i++) 601 TEH_common_purse_deposit_free_coin (&pcc.coins[i]); 602 GNUNET_free (pcc.coins); 603 GNUNET_JSON_parse_free (spec); 604 return TALER_MHD_reply_with_error (connection, 605 MHD_HTTP_FORBIDDEN, 606 TALER_EC_EXCHANGE_PURSE_CREATE_SIGNATURE_INVALID, 607 NULL); 608 } 609 if ( (! pcc.no_econtract) && 610 (GNUNET_OK != 611 TALER_wallet_econtract_upload_verify (pcc.econtract.econtract, 612 pcc.econtract.econtract_size, 613 &pcc.econtract.contract_pub, 614 purse_pub, 615 &pcc.econtract.econtract_sig)) ) 616 { 617 TALER_LOG_WARNING ("Invalid signature on /purses/$PID/create request\n"); 618 for (unsigned int i = 0; i<pcc.num_coins; i++) 619 TEH_common_purse_deposit_free_coin (&pcc.coins[i]); 620 GNUNET_free (pcc.coins); 621 GNUNET_JSON_parse_free (spec); 622 return TALER_MHD_reply_with_error (connection, 623 MHD_HTTP_FORBIDDEN, 624 TALER_EC_EXCHANGE_PURSE_ECONTRACT_SIGNATURE_INVALID, 625 NULL); 626 } 627 628 629 if (GNUNET_SYSERR == 630 TALER_EXCHANGEDB_preflight (TEH_pg)) 631 { 632 GNUNET_break (0); 633 for (unsigned int i = 0; i<pcc.num_coins; i++) 634 TEH_common_purse_deposit_free_coin (&pcc.coins[i]); 635 GNUNET_free (pcc.coins); 636 GNUNET_JSON_parse_free (spec); 637 return TALER_MHD_reply_with_error (connection, 638 MHD_HTTP_INTERNAL_SERVER_ERROR, 639 TALER_EC_GENERIC_DB_START_FAILED, 640 "preflight failure"); 641 } 642 643 /* execute transaction */ 644 { 645 enum MHD_Result mhd_ret; 646 647 if (GNUNET_OK != 648 TEH_DB_run_transaction (connection, 649 "execute purse create", 650 TEH_MT_REQUEST_PURSE_CREATE, 651 &mhd_ret, 652 &create_transaction, 653 &pcc)) 654 { 655 for (unsigned int i = 0; i<pcc.num_coins; i++) 656 TEH_common_purse_deposit_free_coin (&pcc.coins[i]); 657 GNUNET_free (pcc.coins); 658 GNUNET_JSON_parse_free (spec); 659 return mhd_ret; 660 } 661 } 662 663 /* generate regular response */ 664 { 665 enum MHD_Result res; 666 667 res = TEH_RESPONSE_reply_purse_created (connection, 668 pcc.exchange_timestamp, 669 &pcc.deposit_total, 670 &pcc.pd); 671 for (unsigned int i = 0; i<pcc.num_coins; i++) 672 TEH_common_purse_deposit_free_coin (&pcc.coins[i]); 673 GNUNET_free (pcc.coins); 674 GNUNET_JSON_parse_free (spec); 675 return res; 676 } 677 } 678 679 680 /* end of taler-exchange-httpd_purses_create.c */