From 99211b460908a829711df078d87044fc302d7aaf Mon Sep 17 00:00:00 2001 From: priscilla Date: Fri, 25 Nov 2022 10:35:17 -0500 Subject: webhook backend --- .../taler-merchant-httpd_private-post-webhooks.c | 214 +++++++++++++++++++++ 1 file changed, 214 insertions(+) create mode 100644 src/backend/taler-merchant-httpd_private-post-webhooks.c (limited to 'src/backend/taler-merchant-httpd_private-post-webhooks.c') diff --git a/src/backend/taler-merchant-httpd_private-post-webhooks.c b/src/backend/taler-merchant-httpd_private-post-webhooks.c new file mode 100644 index 00000000..ab076924 --- /dev/null +++ b/src/backend/taler-merchant-httpd_private-post-webhooks.c @@ -0,0 +1,214 @@ +/* + This file is part of TALER + (C) 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 taler-merchant-httpd_private-post-webhooks.c + * @brief implementing POST /webhooks request handling + * @author Priscilla HUANG + */ +#include "platform.h" +#include "taler-merchant-httpd_private-post-webhooks.h" +#include "taler-merchant-httpd_helper.h" +#include + + +/** + * How often do we retry the simple INSERT database transaction? + */ +#define MAX_RETRIES 3 + + +/** + * Check if the two webhooks are identical. + * + * @param w1 webhook to compare + * @param w2 other webhook to compare + * @return true if they are 'equal', false if not or of payto_uris is not an array + */ +static bool +webhooks_equal (const struct TALER_MERCHANTDB_WebhookDetails *w1, + const struct TALER_MERCHANTDB_WebhookDetails *w2) +{ + return ( (0 == strcmp (w1->event_type, + w2->event_type)) && + (0 == strcmp (w1->url, + w2->url)) && + (0 == strcmp (w1->http_method, + w2->http_method)) && + (0 == strcmp (w1->header_template, + w2->header_template)) && + (0 == strcmp (w1->body_template, + w2->body_template))); +} + + +MHD_RESULT +TMH_private_post_webhooks (const struct TMH_RequestHandler *rh, + struct MHD_Connection *connection, + struct TMH_HandlerContext *hc) +{ + struct TMH_MerchantInstance *mi = hc->instance; + struct TALER_MERCHANTDB_WebhookDetails wb = { 0 }; + const char *webhook_id; + enum GNUNET_DB_QueryStatus qs; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_string ("webhook_id", + &webhook_id), + GNUNET_JSON_spec_string ("event_type", + (const char **) &wb.event_type), + GNUNET_JSON_spec_string ("url", + (const char **) &wb.url), + GNUNET_JSON_spec_string ("http_method", + (const char **) &wb.http_method), + GNUNET_JSON_spec_string ("header_template", + (const char **) &wb.header_template), + GNUNET_JSON_spec_string ("body_template", + (const char **) &wb.body_template), + 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; + } + } + + + if (! TMH_url_valid (wb.url)) + { + GNUNET_break_op (0); + GNUNET_JSON_parse_free (spec); + return TALER_MHD_reply_with_error (connection, + MHD_HTTP_BAD_REQUEST, + TALER_EC_GENERIC_PARAMETER_MALFORMED, + "url"); + } + + + /* finally, interact with DB until no serialization error */ + for (unsigned int i = 0; istart (TMH_db->cls, + "/post webhooks")) + { + 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->lookup_webhook (TMH_db->cls, + mi->settings.id, + webhook_id, + &ewb); + 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 ewb == wb? */ + { + bool eq; + + eq = webhooks_equal (&wb, + &ewb); + TALER_MERCHANTDB_webhook_details_free (&ewb); + 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_WEBHOOKS_CONFLICT_WEBHOOK_EXISTS, + webhook_id); + } + } /* end switch (qs) */ + + qs = TMH_db->insert_webhook (TMH_db->cls, + mi->settings.id, + webhook_id, + &wb); + 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-webhooks.c */ -- cgit v1.2.3