52 lines
No EOL
1.7 KiB
JavaScript
52 lines
No EOL
1.7 KiB
JavaScript
/* https://raw.githubusercontent.com/napa3um/node-captcha/refs/heads/master/captcha.js */
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import Route from "../route.js";
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import initDb from "../db.js";
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import Canvas from "canvas";
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import crypto from "node:crypto";
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let db = await initDb();
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let main = new Route([], async function (req, res, input) {
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const canvas = new Canvas.Canvas(250, 100)
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const ctx = canvas.getContext('2d')
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ctx.antialias = 'gray'
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ctx.fillStyle = 'black'
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ctx.fillRect(0, 0, 250, 100)
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ctx.fillStyle = 'red'
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ctx.lineWidth = 3
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ctx.strokeStyle = 'red'
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ctx.font = `40px sans`
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// draw two curve lines:
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for (var i = 0; i < 2; i++) {
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ctx.moveTo(Math.floor(0.08 * 250), Math.random() * 100)
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ctx.bezierCurveTo(Math.floor(0.32 * 250), Math.random() * 100, Math.floor(1.07 * 100), Math.random() * 100, Math.floor(0.92 * 250), Math.random() * 100)
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ctx.stroke()
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}
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// draw text:
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const text = ('' + crypto.randomBytes(4).readUIntBE(0, 4)).substring(2, 10)
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text.split('').forEach((char, i) => {
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ctx.setTransform(Math.random() * 0.5 + 1, Math.random() * 0.4, Math.random() * 0.4, Math.random() * 0.5 + 1, Math.floor(0.375 * 50) * i + Math.floor(0.25 * 10), Math.floor(1.25 * 40))
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ctx.fillText(char, 0, 0)
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})
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let ck = crypto.randomUUID();
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res.cookie('captcha', ck);
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await db.run('INSERT INTO captcha (key, solution) VALUES (?,?)', [
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ck,
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text
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])
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// send image:
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res.type('jpg')
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res.header('Cache-Control', 'no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0')
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res.header('Expires', 'Sun, 19 May 1984 02:00:00 GMT')
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canvas.jpegStream().pipe(res)
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return true;
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});
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export default main; |