m_clientinfo: CLIENTINFO command module for WebIRC client metadata

[denebdev]

Hi,

I would like to submit an external InspIRCd4 module for review by the InspIRCd community:

• Repository: https://github.com/denebdev/insp4-m_clientinfo
• Public release: https://github.com/denebdev/insp4-m_clientinfo/releases/tag/v1.0.0
• Successful GitHub Actions build: https://github.com/denebdev/insp4-m_clientinfo/actions/runs/29183745213

The module is called m_clientinfo. It collects client metadata provided via METADATA, performs browser/OS/device/bot/headless/proxy/datacenter/risk checks, and exposes the collected information to IRC operators with:

/CLIENTINFO <nick>

By default it replies using raw numeric 999, configurable with:

<clientinfo clientinfonumeric="999" operonly="yes">

Important behaviour:

• It does not hook, extend, or change normal /WHOIS output.
• It keeps the normal InspIRCd WHOIS behaviour untouched.
• It emits IRCop SNOTICE alerts for client metadata, suspicious/bot/headless/high-risk/malicious detections, and oversized metadata.
• It supports configurable detection toggles, local proxy/datacenter CIDR lists, connection logging, statistics, and additional metadata fields.

Use case: some IRC networks using WebIRC or browser-based clients want IRC operators to inspect client metadata without overloading /WHOIS or changing standard WHOIS behaviour. A separate /CLIENTINFO <nick> command keeps this explicit and scriptable.

The raw numeric response includes the target nick on every line so operator scripts, including mIRC scripts, can parse the target and apply local moderation policy.

I would appreciate feedback on whether this should remain an external third-party module, be linked somewhere, or be reshaped for a possible future PR.

Thanks for taking a look.