overleaf/services/web/app/coffee/Features/Captcha/CaptchaMiddleware.coffee

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request = require 'request'
logger = require 'logger-sharelatex'
Settings = require 'settings-sharelatex'
module.exports = CaptchaMiddleware =
validateCaptcha: (req, res, next) ->
if !Settings.recaptcha?
return next()
response = req.body['g-recaptcha-response']
options =
form:
secret: Settings.recaptcha.secretKey
response: response
json: true
request.post "https://www.google.com/recaptcha/api/siteverify", options, (error, response, body) ->
return next(error) if error?
if !body?.success
logger.warn {statusCode: response.statusCode, body: body}, 'failed recaptcha siteverify request'
return res.status(400).send({errorReason:"cannot_verify_user_not_robot", message:
{text:"Sorry, we could not verify that you are not a robot. Please check that Google reCAPTCHA is not being blocked by an ad blocker or firewall."}
})
else
return next()