https://godoc.org/github.com/dpapathanasiou/go-recaptcha
This package handles reCaptcha (API versions 2 and 3) form submissions in Go.
Install the package in your environment:
go get github.com/dpapathanasiou/go-recaptcha
To use it within your own code, import github.com/dpapathanasiou/go-recaptcha and call:
recaptcha.Init (recaptchaPrivateKey)
once, to set the reCaptcha private key for your domain, then:
recaptcha.Confirm (clientIpAddress, recaptchaResponse)
For each reCaptcha form input you need to check, using the values obtained by reading the form's POST parameters (the recaptchaResponse in the above corresponds to the value of g-recaptcha-response sent by the reCaptcha server.)
The recaptcha.Confirm() function returns either true (i.e., the captcha was completed correctly) or false, along with any errors (from the HTTP io read or the attempt to unmarshal the JSON reply).
Version 3 works differently: instead of interrupting page visitors with a prompt, it runs in the background, computing a score.
This repo has been updated to handle the score and action in the response, but the usage example is still in terms of version 2.
Included with this repo is example.go, a simple HTTP server which creates the reCaptcha form and tests the input.
See the instructions for running the example for more details.
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