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freeptcha
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draft v2

This commit is contained in:
b1ek 2023-08-22 19:17:15 +10:00
parent e1f2fdffbf
commit e4926a3aa3
Signed by: blek
GPG Key ID: 14546221E3595D0C
3 changed files with 85 additions and 9 deletions
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BIN
asset/lobster.ttf Normal file
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41
public/index.html
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@ -1,5 +1,12 @@
<!DOCTYPE html>
<html>
<head>
<style>
td.description {
padding-right: 16px;
}
</style>
</head>
<body>
<h1 align="center">This is FreePtcha, a completely open source captcha.</h1>
<hr/>
@ -27,14 +34,32 @@
<hr/>
<h2>Example</h2>
<p>
<a href="/captcha/v1/UwU">
/captcha/v1/UwU<br/>
<img src="/captcha/v1/UwU" />
</a>
<br/>
A simple text stroked over a lot of times
</p>
<table>
<tbody>
<tr>
<td>
<a href="/captcha/v1/UwU">
/captcha/v1/UwU<br/>
<img src="/captcha/v1/UwU" />
</a>
</td>
<td>
<a href="/captcha/v2/UwU">
/captcha/v2/UwU<br/>
<img src="/captcha/v2/UwU" />
</a>
</td>
</tr>
<tr>
<td class="description">
A simple text stroked over a lot of times
</td>
<td class="description">
Text with a few random letters and circles in the background
</td>
</tr>
</tbody>
</table>
<hr/>

53
routes.js
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@ -1,7 +1,10 @@
const sharp = require('sharp');
const canvas = require('canvas');
const crypto = require('crypto');
const randint = (min, max) => { return crypto.randomInt(max) + min };
const path = require('path');
const randint = (min, max) => { return crypto.randomInt(min, max) };
canvas.registerFont(path.join(__dirname, 'asset/lobster.ttf'), { family: 'Lobster' });
/** @param {import('fastify').FastifyRequest} req */
const getSettings = (req) => {
@ -89,5 +92,53 @@ module.exports = (fastify) => {
res.header('Content-Type', 'png');
return draw.toBuffer();
});
fastify.get('/captcha/v2/:text', async (req, res) => {
const text = req.params.text;
const settings = getSettings(req);
const size = get_size([settings.width, settings.height], settings.dpi, text.length, settings.padding);
size.height *= 0.5
const draw = canvas.createCanvas(size.width, size.height);
const ctx = draw.getContext('2d');
const arcs = randint(5, 32);
for (let i = 0; i != arcs; i++) {
ctx.beginPath();
ctx.strokeStyle = `rgba(${randint(0,255)},${randint(0,255)},${randint(0,255)},${randint(0,255)})`;
ctx.arc(randint(0, size.width), randint(0, size.height), randint(10, 25), 0, 360);
ctx.stroke();
ctx.closePath();
}
// let i = 0;
ctx.textDrawingMode = 'path';
const textStyles = ['#f00', '#2a4', '#00f', '#9a0', '#f0f'];
ctx.strokeStyle = textStyles[randint(0, textStyles.length)];
ctx.font = `${settings.dpi * 0.2}px sans-serif`;
textStyles.splice(textStyles.indexOf(ctx.strokeStyle), 1);
const gap = randint(50, 64);
for (const i in text) {
ctx.fillText(text[i], settings.padding + (i * randint(40,48)), randint(Math.floor(settings.padding + settings.dpi * 0.05), size.height - settings.padding + Math.floor(settings.dpi * 0.1)), 200);
ctx.stroke()
}
const fauxletters = randint(20,40);
let alphabet = 'abcdefghijklmnopqrstuvwxyz';
alphabet += alphabet.toUpperCase();
alphabet += '0123456789';
for (let i = 0; i !== fauxletters; i++) {
ctx.strokeStyle = textStyles[randint(0,textStyles.length)] + '2';
ctx.font = `${settings.dpi * 0.2}px serif`
ctx.strokeText(alphabet[randint(0, alphabet.length)], randint(0, size.width), randint(0, size.height), 200);
ctx.stroke()
}
res.header('Content-Type', 'image/png');
return draw.toBuffer();
})
}