will-lib/libs/Captchar.js

Library classes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.captchar = void 0;
const canvas_1 = require("canvas");
const random_js_1 = require("random-js");
const fs = require('fs');
const path = require('path');
const randomColor = require('randomcolor');
const r = new random_js_1.Random();
function generateText(canvas, textLength, pool, math) {
    let ctx = canvas.getContext('2d');
    let text = r.string(textLength, pool);
    let mathcode = undefined;
    if (math === "+" || math == "add") {
        let f1 = r.integer(1, 100);
        let f2 = r.integer(1, 100);
        mathcode = f1 + f2;
        text = f1 + " + " + f2;
    }
    else if (math == "-" || math == "subtract") {
        let f1 = r.integer(1, 100);
        let f2 = r.integer(1, 100);
        mathcode = f1 - f2;
        text = f1 + " - " + f2;
    }
    else if (math == "x" || math == "*" || math == "multiply") {
        let f1 = r.integer(1, 100);
        let f2 = r.integer(1, 100);
        mathcode = f1 * f2;
        text = f1 + " x " + f2;
    }
    let tmp = '';
    let textFullWidth = ctx.measureText(text).width;
    let startPosX = (canvas.width - textFullWidth) / 2;
    let startPosY = canvas.height / 2;
    let code = '';
    for (var i = 0, len = text.length; i < len; i++) {
        let textMetrics = ctx.measureText(tmp) || {};
        let character = text.charAt(i);
        tmp += character;
        ctx.fillStyle = randomColor({ luminosity: 'dark', hue: 'random' });
        code += character;
        let y = r.integer(-10, 20);
        ctx.fillText(character, Math.abs(startPosX + textMetrics.width + 2), startPosY + y);
    }
    if (mathcode)
        return { code: "" + mathcode, text: text };
    return { code: code, text: text };
}
function generateNoise(canvas) {
    let ctx = canvas.getContext('2d');
    let i = 25;
    while (i--) {
        let loop = 25;
        let x = r.real(0, canvas.width);
        let y = r.real(0, canvas.height);
        ctx.beginPath();
        ctx.moveTo(x, y);
        while (loop--) {
            ctx.lineTo(x + r.real(-20, 20), y + r.real(-20, 20));
        }
        ctx.strokeStyle = randomColor({ luminosity: 'light', format: 'rgb' }).replace(/rgb\((.*)\)/, 'rgba($1,' + r.real(0.25, 0.75) + ')');
        ctx.stroke();
    }
}
function generate(options) {
    if (!options)
        options = {};
    let base = {
        width: 250,
        height: 100,
        fontSize: 32,
        fontFamily: 'Times New Roman',
        textLength: 8,
        backgroundColor: '#fff',
        pool: 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789',
        math: ''
    };
    options = { ...base, ...options };
    //console.log("options",JSON.stringify(options));
    let canvas = new canvas_1.Canvas(options.width, options.height);
    let ctx = canvas.getContext('2d');
    ctx.fillStyle = options.backgroundColor;
    ctx.fillRect(0, 0, options.width, options.height);
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.font = options.fontSize + 'px ' + options.fontFamily;
    generateNoise(canvas);
    let res = generateText(canvas, options.textLength, options.pool, options.math);
    return {
        code: res.code,
        text: res.text,
        canvas: canvas
    };
}
async function captchar(options) {
    var outputDir = (options?.outputDir || process.cwd());
    return new Promise(function (resolve, reject) {
        let img = generate(options);
        if (options?.format === 'fs') {
            let filepath = path.join(outputDir, (options?.imageName || Date.now().toString()) + '.png');
            //let filepath = path.join(outputDir, (options.imageName || img.code) + '.png');
            img.canvas.toBuffer(function (err, data) {
                if (err) {
                    return reject(err);
                }
                fs.writeFile(filepath, data, function (err) {
                    err ? reject(err) : resolve({
                        src: filepath,
                        code: img.code,
                        text: img.text
                    });
                });
            });
        }
        else {
            img.canvas.toDataURL(function (err, str) {
                err ? reject(err) : resolve({
                    src: str,
                    code: img.code,
                    text: img.text
                });
            });
        }
    });
}
exports.captchar = captchar;
;