[taler-merchant] 02/14: adding webhook for the categories

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grothoff pushed a commit to branch master
in repository merchant.

commit 75c8023ca740511425fc34b5b75bd1f91b1df22e
Author: bohdan-potuzhnyi <bohdan.potuzhnyi@gmail.com>
AuthorDate: Thu Nov 21 09:38:34 2024 +0100

    adding webhook for the categories
---
 src/backenddb/merchant-0013.sql | 113 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)

diff --git a/src/backenddb/merchant-0013.sql b/src/backenddb/merchant-0013.sql
new file mode 100644
index 00000000..68338f40
--- /dev/null
+++ b/src/backenddb/merchant-0013.sql
@@ -0,0 +1,113 @@
+--
+-- This file is part of TALER
+-- Copyright (C) 2024 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 merchant-0013.sql
+-- @brief Creating trigger for the category change webhook
+-- @author Bohdan Potuzhnyi
+-- @author Vlada Svirsh
+
+
+BEGIN;
+
+-- Check patch versioning is in place.
+SELECT _v.register_patch('merchant-0013', NULL, NULL);
+
+SET search_path TO merchant;
+
+-- Trigger function to handle pending webhooks for category changes
+CREATE OR REPLACE FUNCTION handle_category_changes()
+RETURNS TRIGGER AS $$
+DECLARE
+  my_merchant_serial BIGINT;
+BEGIN
+  -- Fetch the merchant_serial directly from the NEW or OLD row
+  my_merchant_serial := COALESCE(OLD.merchant_serial, NEW.merchant_serial);
+
+  -- Check if there are webhooks listening for this event
+  PERFORM 1
+  FROM merchant_webhook mw
+  WHERE mw.event_type IN ('category_added', 'category_updated', 
'category_deleted')
+    AND mw.merchant_serial = my_merchant_serial;
+
+  IF FOUND THEN
+    -- INSERT case: Add a webhook for category addition
+    IF TG_OP = 'INSERT' THEN
+      INSERT INTO merchant_pending_webhooks
+      (merchant_serial, webhook_serial, url, http_method, body)
+      SELECT mw.merchant_serial,
+             mw.webhook_serial,
+             mw.url,
+             mw.http_method,
+             json_build_object(
+               'webhook_type', 'category_added',
+               'category_serial', NEW.category_serial,
+               'category_name', NEW.category_name
+             )::TEXT
+      FROM merchant_webhook mw
+      WHERE mw.event_type = 'category_added'
+        AND mw.merchant_serial = my_merchant_serial;
+    END IF;
+
+    -- UPDATE case: Add a webhook for category update
+    IF TG_OP = 'UPDATE' THEN
+      INSERT INTO merchant_pending_webhooks
+      (merchant_serial, webhook_serial, url, http_method, body)
+      SELECT mw.merchant_serial,
+             mw.webhook_serial,
+             mw.url,
+             mw.http_method,
+             json_build_object(
+               'webhook_type', 'category_updated',
+               'category_serial', NEW.category_serial,
+               'old_category_name', OLD.category_name,
+               'new_category_name', NEW.category_name
+             )::TEXT
+      FROM merchant_webhook mw
+      WHERE mw.event_type = 'category_updated'
+        AND mw.merchant_serial = my_merchant_serial;
+    END IF;
+
+    -- DELETE case: Add a webhook for category deletion
+    IF TG_OP = 'DELETE' THEN
+      INSERT INTO merchant_pending_webhooks
+      (merchant_serial, webhook_serial, url, http_method, body)
+      SELECT mw.merchant_serial,
+             mw.webhook_serial,
+             mw.url,
+             mw.http_method,
+             json_build_object(
+               'webhook_type', 'category_deleted',
+               'category_serial', OLD.category_serial,
+               'category_name', OLD.category_name
+             )::TEXT
+      FROM merchant_webhook mw
+      WHERE mw.event_type = 'category_deleted'
+        AND mw.merchant_serial = my_merchant_serial;
+    END IF;
+  END IF;
+
+  RETURN NULL; -- Triggers that fire AFTER must return NULL
+END;
+$$ LANGUAGE plpgsql;
+
+-- Trigger to invoke the trigger function
+CREATE TRIGGER trigger_category_changes
+AFTER INSERT OR UPDATE OR DELETE
+ON merchant_categories
+FOR EACH ROW
+EXECUTE FUNCTION handle_category_changes();
+
+COMMIT;

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