Small endpoint to get an email address and persist it to disk using the google Captcha v3 in the front end.
The store endpoint validates the email and persists to disk if ok.
The bot is redirected to denied.html and the user is redirected to thankyou.html
<script src="https://www.google.com/recaptcha/api.js?render=INSERT-API-KEY-HEREonload=onloadCallback"></script>
<form id="emailform" method="POST" action="http://localhost:8080/store">
<!-- Populated by Captcha v3 -->
<input type="hidden" id="g-recaptcha-response" name="token" required>
<input type="hidden" name="ok" value="https://sportybiz.eu/thankyou.html">
<input type="hidden" name="failed" value="https://sportybiz.eu/denied.html">
<input id="email" name="email" type="email" class="validate" required>
<button class="g-recaptcha btn waves-effect waves-light"
type="submit" name="action">Submit
</button>
</form>var onloadCallback = function() {
grecaptcha.ready(function() {
console.log("READY")
grecaptcha.execute('INSERT-API-KEY-HERE',
{action: 'homepage'})
.then(function(token) {
// add token value to form
document.getElementById('g-recaptcha-response').value = token;
});
});
};To compile you need to add a directory called private which is ignored by git containing the file called secrets.json containing
{
"captchakey" : "<INSERT SECRET API KEY HERE"
}The code is built using pakr which includes the secrets file resulting in no dependencies outside the binary.
GOOS=darwin GOARCH=amd64 packr2 build && mv ./getemail ./releases/darwin-getemail \
&& GOOS=linux GOARCH=amd64 packr2 build && mv ./getemail ./releases/linux-getemail \
&& GOOS=windows GOARCH=386 packr2 build && mv ./getemail.exe ./releases/getemail.exe \
&& packr cleanThe user running the server needs write access to the current directory
getemail.service is put in /etc/systemd/system getemail.sh is put in /etc/init.d
Location of the binary is in both files.
sites-available/
location /store {
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
proxy_pass http://localhost:8020;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_buffering off;
}