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

说明与用途

为 WhatsApp 构建了一个轻量级规则引擎，解决了关键字误匹配、时区错误、重复回复和属性更新循环等问题，并通过单元测试验证正确性。

问题

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

结果

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

工作流

• 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

证据

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

来源

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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