Building a Rules Engine for WhatsApp Automation: Keywords, Working Hours, Priorities and Loops

Описание и применение

Создана небольшая система правил для WhatsApp, устраняющая ложные срабатывания по ключевым словам, учитывающая часовой пояс магазина, предотвращающая дублирование ответов и бесконечные циклы обновления атрибутов.

Задача

Keyword matching, time zone handling, duplicate replies, and infinite loops caused bugs in a WhatsApp automation rules engine.

Результат

The refined engine eliminates keyword false positives, respects shop local hours, avoids duplicate replies, and prevents infinite attribute loops, with tests ensuring reliability.

Рабочий процесс

• Define rule structure: trigger, filter (AND/OR groups), action
• Implement keyword filter using whole‑word regex to avoid false positives
• Implement working‑hours filter using Intl.DateTimeFormat with shop time zone
• Add duplicate webhook detection to avoid double replies
• Add loop detection for attribute updates
• Write unit tests for each bug scenario

Доказательства

Keyword matching catches "priceless" when you meant "price".

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A working-hours check runs in the server's time zone instead of the shop's.

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Three rules all reply to the same message.

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A redelivered webhook sends the welcome message twice.

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Two rules that update each other's attributes loop forever.

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