In-Band registration: Support Captcha (XEP-0158)
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Nice to have: Captchas for In-Band registration.
https://xmpp.org/extensions/xep-0158.html#register
Background info: Some XMPP server operators turn off in-band registration because of misuse by spam bots. Most web registration interfaces support captchas, so this is a common approach how to handle registrations.
Still this is not a really satisfying practise, since in-band registration exists for a reason and users are expecting to be able to register directly via their XMPP client (and not only via web). Therefore I'm asking to implement captchas for in-band registration.
Note: Captchas should not be implemented via Google Recatchas, because avoiding Google and its services is a main reason why people use XMPP ;-) XMPP users tend to dislike links and dependencies to/from "big players" for a good reason. Fortunately, there are some Golang captcha libraries out there, such as: https://github.com/dchest/captcha
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