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templates.go
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package main
const captchaHTML = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate"/>
<title>CAPTCHA</title>
<style>
* {
box-sizing: border-box;
}
.container {
margin: auto;
max-width: 320px;
}
.container h2 {
text-align: center;
}
form.captcha input[type="text"] {
text-align: center;
padding: 10px;
font-size: 17px;
border: 1px solid grey;
float: left;
width: 74%;
background: #f1f1f1;
}
form.captcha button {
float: left;
width: 26%;
padding: 10px;
background: #2196F3;
color: white;
font-size: 17px;
border: 1px solid grey;
border-left: none;
cursor: pointer;
}
form.captcha button:hover {
background: #0b7dda;
}
form.captcha::after {
content: "";
clear: both;
display: table;
}
</style>
</head>
<body>
<div class="container">
<h2>CAPTCHA</h2>
<p>Please verify that you are not a robot.</p>
<img src="data:image/png;base64, {{ .Base64 }}" alt="{{ .TextHash }}" id="{{ .ImageID }}" />
<form id="captcha_form" class="captcha" method="POST" action="/">
<input type="hidden" name="{{ .ChallengeKey }}" value="{{ .TextHash }}">
<input type="text" name="{{ .ResponseKey }}" minlength="6" maxlength="6" pattern="[A-Za-z0-9]{6}" value="" autocomplete="off" autofocus>
<button type="submit">VERIFY</button>
</form>
<script async="false">
document.getElementById('captcha_form').addEventListener('submit', function(event){
event.preventDefault();
var xhr = new XMLHttpRequest();
var data = new URLSearchParams();
data.append('{{ .ChallengeKey }}', '{{ .TextHash }}');
data.append('{{ .ResponseKey }}', document.getElementById('captcha_form').elements['{{ .ResponseKey }}'].value);
xhr.open('POST', '/', true);
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
xhr.send(data);
xhr.onreadystatechange = function() {
if (this.readyState != 4) return;
window.location.assign(window.location.href);
document.location.reload(true);
}
});
</script>
</div>
</body>
</html>
`
/*
https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST
https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams
*/
const captchaLight = `
<img src="data:image/png;base64, {{ .Base64 }}" alt="{{ .TextHash }}" id="{{ .ImageID }}" />
`