diff options
Diffstat (limited to 'src/backend/taler-merchant-httpd_private-post-otp-devices.c')
| -rw-r--r-- | src/backend/taler-merchant-httpd_private-post-otp-devices.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/backend/taler-merchant-httpd_private-post-otp-devices.c b/src/backend/taler-merchant-httpd_private-post-otp-devices.c new file mode 100644 index 00000000..ff70fb58 --- /dev/null +++ b/src/backend/taler-merchant-httpd_private-post-otp-devices.c @@ -0,0 +1,199 @@ +/* + This file is part of TALER + (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 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 taler-merchant-httpd_private-post-otp-devices.c + * @brief implementing POST /otp-devices request handling + * @author Christian Grothoff + */ +#include "platform.h" +#include "taler-merchant-httpd_private-post-otp-devices.h" +#include "taler-merchant-httpd_helper.h" +#include <taler/taler_json_lib.h> + + +/** + * How often do we retry the simple INSERT database transaction? + */ +#define MAX_RETRIES 3 + + +/** + * Check if the two otp-devices are identical. + * + * @param t1 device to compare + * @param t2 other device to compare + * @return true if they are 'equal', false if not or of payto_uris is not an array + */ +static bool +otp_devices_equal (const struct TALER_MERCHANTDB_OtpDeviceDetails *t1, + const struct TALER_MERCHANTDB_OtpDeviceDetails *t2) +{ + return ( (0 == strcmp (t1->otp_description, + t2->otp_description)) && + (0 == strcmp (t1->otp_key, + t2->otp_key) ) && + (t1->otp_ctr == t2->otp_ctr) && + (t1->otp_algorithm == t2->otp_algorithm) ); +} + + +MHD_RESULT +TMH_private_post_otp_devices (const struct TMH_RequestHandler *rh, + struct MHD_Connection *connection, + struct TMH_HandlerContext *hc) +{ + struct TMH_MerchantInstance *mi = hc->instance; + struct TALER_MERCHANTDB_OtpDeviceDetails tp = { 0 }; + const char *device_id; + enum GNUNET_DB_QueryStatus qs; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_string ("otp_device_id", + &device_id), + GNUNET_JSON_spec_string ("otp_device_description", + (const char **) &tp.otp_description), + TALER_JSON_spec_otp_type ("otp_algorithm", + &tp.otp_algorithm), + GNUNET_JSON_spec_mark_optional ( + GNUNET_JSON_spec_uint64 ("otp_ctr", + &tp.otp_ctr), + NULL), + TALER_JSON_spec_otp_key ("otp_key", + (const char **) &tp.otp_key), + GNUNET_JSON_spec_end () + }; + + GNUNET_assert (NULL != mi); + { + enum GNUNET_GenericReturnValue res; + + res = TALER_MHD_parse_json_data (connection, + hc->request_body, + spec); + if (GNUNET_OK != res) + { + GNUNET_break_op (0); + return (GNUNET_NO == res) + ? MHD_YES + : MHD_NO; + } + } + + /* finally, interact with DB until no serialization error */ + for (unsigned int i = 0; i<MAX_RETRIES; i++) + { + /* Test if a OTP device of this id is known */ + struct TALER_MERCHANTDB_OtpDeviceDetails etp; + + if (GNUNET_OK != + TMH_db->start (TMH_db->cls, + "/post otp-devices")) + { + GNUNET_break (0); + GNUNET_JSON_parse_free (spec); + return TALER_MHD_reply_with_error (connection, + MHD_HTTP_INTERNAL_SERVER_ERROR, + TALER_EC_GENERIC_DB_START_FAILED, + NULL); + } + qs = TMH_db->select_otp (TMH_db->cls, + mi->settings.id, + device_id, + &etp); + switch (qs) + { + case GNUNET_DB_STATUS_HARD_ERROR: + /* Clean up and fail hard */ + GNUNET_break (0); + TMH_db->rollback (TMH_db->cls); + GNUNET_JSON_parse_free (spec); + return TALER_MHD_reply_with_error (connection, + MHD_HTTP_INTERNAL_SERVER_ERROR, + TALER_EC_GENERIC_DB_FETCH_FAILED, + NULL); + case GNUNET_DB_STATUS_SOFT_ERROR: + /* restart transaction */ + goto retry; + case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS: + /* Good, we can proceed! */ + break; + case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT: + /* idempotency check: is etp == tp? */ + { + bool eq; + + eq = otp_devices_equal (&tp, + &etp); + GNUNET_free (etp.otp_description); + GNUNET_free (etp.otp_key); + TMH_db->rollback (TMH_db->cls); + GNUNET_JSON_parse_free (spec); + return eq + ? TALER_MHD_reply_static (connection, + MHD_HTTP_NO_CONTENT, + NULL, + NULL, + 0) + : TALER_MHD_reply_with_error (connection, + MHD_HTTP_CONFLICT, + TALER_EC_MERCHANT_PRIVATE_POST_OTP_DEVICES_CONFLICT_OTP_DEVICE_EXISTS, + device_id); + } + } /* end switch (qs) */ + + qs = TMH_db->insert_otp (TMH_db->cls, + mi->settings.id, + device_id, + &tp); + if (GNUNET_DB_STATUS_HARD_ERROR == qs) + { + TMH_db->rollback (TMH_db->cls); + break; + } + if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs) + { + qs = TMH_db->commit (TMH_db->cls); + if (GNUNET_DB_STATUS_SOFT_ERROR != qs) + break; + } +retry: + GNUNET_assert (GNUNET_DB_STATUS_SOFT_ERROR == qs); + TMH_db->rollback (TMH_db->cls); + } /* for RETRIES loop */ + GNUNET_JSON_parse_free (spec); + if (qs < 0) + { + GNUNET_break (0); + return TALER_MHD_reply_with_error ( + connection, + MHD_HTTP_INTERNAL_SERVER_ERROR, + (GNUNET_DB_STATUS_SOFT_ERROR == qs) + ? TALER_EC_GENERIC_DB_SOFT_FAILURE + : TALER_EC_GENERIC_DB_COMMIT_FAILED, + NULL); + } + return TALER_MHD_reply_static (connection, + MHD_HTTP_NO_CONTENT, + NULL, + NULL, + 0); +} + + +/* end of taler-merchant-httpd_private-post-otp-devices.c */ |