arsam
043a97556f
Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.
72 lines
2.4 KiB
TypeScript
72 lines
2.4 KiB
TypeScript
import { randomBytes } from 'node:crypto';
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import { redis } from '../redis.js';
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const CAPTCHA_PREFIX = 'captcha:';
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const CAPTCHA_TTL = 120;
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function generateCaptchaText(length: number = 5): string {
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const chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
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let result = '';
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for (let i = 0; i < length; i++) {
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result += chars.charAt(Math.floor(Math.random() * chars.length));
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}
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return result;
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}
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function generateCaptchaSVG(text: string): string {
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const width = 200;
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const height = 80;
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const colors = ['#0F6B73', '#D49A2A', '#C76D4A', '#2F8F6B', '#5F6B6D'];
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const bgColor = '#f0f0f0';
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let noiseSVG = '';
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for (let i = 0; i < 5; i++) {
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const x1 = Math.random() * width;
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const y1 = Math.random() * height;
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const x2 = Math.random() * width;
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const y2 = Math.random() * height;
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const color = colors[Math.floor(Math.random() * colors.length)];
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noiseSVG += `<line x1="${x1}" y1="${y1}" x2="${x2}" y2="${y2}" stroke="${color}" stroke-width="1.5" opacity="0.3"/>`;
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}
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let textSVG = '';
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const charSpacing = width / (text.length + 1);
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for (let i = 0; i < text.length; i++) {
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const char = text[i];
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const x = charSpacing * (i + 1) + (Math.random() - 0.5) * 10;
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const y = height / 2 + (Math.random() - 0.5) * 15;
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const rotation = (Math.random() - 0.5) * 30;
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const color = colors[Math.floor(Math.random() * colors.length)];
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const fontSize = 32 + Math.random() * 8;
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textSVG += `<text x="${x}" y="${y}" font-size="${fontSize}" font-weight="bold" fill="${color}" transform="rotate(${rotation} ${x} ${y})" font-family="Arial, sans-serif">${char}</text>`;
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}
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return `<svg xmlns="http://www.w3.org/2000/svg" width="${width}" height="${height}" viewBox="0 0 ${width} ${height}">
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<rect width="${width}" height="${height}" fill="${bgColor}"/>
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${noiseSVG}
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${textSVG}
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</svg>`;
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}
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export async function createCaptcha() {
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const id = randomBytes(16).toString('hex');
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const text = generateCaptchaText(5);
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const svg = generateCaptchaSVG(text);
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await redis.set(CAPTCHA_PREFIX + id, text.toLowerCase(), 'EX', CAPTCHA_TTL);
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return { id, data: svg };
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}
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export async function verifyCaptcha(captchaId: string, userSolution: string): Promise<boolean> {
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const key = CAPTCHA_PREFIX + captchaId;
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const stored = await redis.get(key);
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if (!stored) return false;
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await redis.del(key);
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return stored === userSolution.toLowerCase().trim();
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}
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