persian-captcha-generator/dist/index.js

A library for generating customizable captchas with Persian numbers and alphabets using node-canvas.

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.persianCaptchaGenerator = persianCaptchaGenerator;
const fs_1 = __importDefault(require("fs"));
const path_1 = __importDefault(require("path"));
const canvas_1 = require("@napi-rs/canvas");
function registerFont() {
    const possiblePaths = [
        path_1.default.resolve(__dirname, "..", "fonts", "BNazanin.ttf"),
        path_1.default.resolve(process.cwd(), "node_modules", "persian-captcha-generator", "fonts", "BNazanin.ttf"),
    ];
    let fontPath = null;
    for (const path of possiblePaths) {
        if (fs_1.default.existsSync(path)) {
            fontPath = path;
            break;
        }
    }
    if (!fontPath) {
        throw new Error(`Font file not found. Please ensure BNazanin.ttf exists in one of these locations: ${possiblePaths.join(", ")}`);
    }
    try {
        canvas_1.GlobalFonts.registerFromPath(fontPath, "BNazanin");
    }
    catch (error) {
        console.error("Error registering font:", error);
        throw new Error(`Failed to load font from path: ${fontPath}`);
    }
}
async function persianCaptchaGenerator({ width = 200, height = 100, length = 5, backgroundColor = "#ffffff", textColor = "#000000", fontSize = 40, lineCount = 8, dotCount = 50, characterSet = "numbers", }) {
    registerFont();
    const persianAlphabets = "ابپتثجچحخدذرزژسشصضطظعغفقکگلمنهوی";
    const persianNumbers = "۰۱۲۳۴۵۶۷۸۹";
    let characters;
    if (characterSet === "numbers") {
        characters = persianNumbers;
    }
    else if (characterSet === "alphabets") {
        characters = persianAlphabets;
    }
    else {
        characters = persianNumbers + persianAlphabets;
    }
    const randomText = Array.from({ length }, () => characters.charAt(Math.floor(Math.random() * characters.length))).join("");
    const canvas = (0, canvas_1.createCanvas)(width, height);
    const context = canvas.getContext("2d");
    context.fillStyle = backgroundColor;
    context.fillRect(0, 0, width, height);
    for (let i = 0; i < lineCount; i++) {
        context.beginPath();
        context.moveTo(Math.random() * width, Math.random() * height);
        context.lineTo(Math.random() * width, Math.random() * height);
        context.strokeStyle = `hsl(${Math.random() * 360}, 70%, 50%)`;
        context.lineWidth = 2;
        context.stroke();
    }
    for (let i = 0; i < dotCount; i++) {
        context.beginPath();
        context.arc(Math.random() * width, Math.random() * height, Math.random() * 2 + 1, 0, Math.PI * 2);
        context.fillStyle = `hsl(${Math.random() * 360}, 70%, 50%)`;
        context.fill();
    }
    context.font = `${fontSize}px BNazanin`;
    context.fillStyle = textColor;
    context.textAlign = "center";
    context.textBaseline = "middle";
    const centerX = width / 2;
    const centerY = height / 2;
    randomText.split("").forEach((char, i) => {
        const offset = Math.random() * 10 - 5;
        const x = centerX - (length * fontSize) / 4 + i * (fontSize * 0.6);
        context.fillText(char, x, centerY + offset);
    });
    return {
        text: randomText,
        imageBuffer: canvas.toBuffer("image/png"),
    };
}