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92 lines
2.8 KiB
92 lines
2.8 KiB
1 month ago
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'use strict';
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const chToPath = require('./ch-to-path');
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const random = require('./random');
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const optionMngr = require('./option-manager');
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const opts = optionMngr.options;
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const getLineNoise = function (width, height, options) {
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const hasColor = options.color;
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const noiseLines = [];
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const min = options.inverse ? 7 : 1;
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const max = options.inverse ? 15 : 9;
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let i = -1;
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while (++i < options.noise) {
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const start = `${random.int(1, 21)} ${random.int(1, height - 1)}`;
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const end = `${random.int(width - 21, width - 1)} ${random.int(1, height - 1)}`;
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const mid1 = `${random.int((width / 2) - 21, (width / 2) + 21)} ${random.int(1, height - 1)}`;
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const mid2 = `${random.int((width / 2) - 21, (width / 2) + 21)} ${random.int(1, height - 1)}`;
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const color = hasColor ? random.color() : random.greyColor(min, max);
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noiseLines.push(`<path d="M${start} C${mid1},${mid2},${end}" stroke="${color}" fill="none"/>`);
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}
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return noiseLines;
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};
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const getText = function (text, width, height, options) {
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const len = text.length;
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const spacing = (width - 2) / (len + 1);
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const min = options.inverse ? 10 : 0;
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const max = options.inverse ? 14 : 4;
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let i = -1;
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const out = [];
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while (++i < len) {
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const x = spacing * (i + 1);
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const y = height / 2;
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const charPath = chToPath(text[i], Object.assign({x, y}, options));
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const color = options.color ?
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random.color(options.background) : random.greyColor(min, max);
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out.push(`<path fill="${color}" d="${charPath}"/>`);
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}
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return out;
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};
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const createCaptcha = function (text, options) {
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text = text || random.captchaText();
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options = Object.assign({}, opts, options);
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const width = options.width;
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const height = options.height;
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const bg = options.background;
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if (bg) {
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options.color = true;
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}
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const bgRect = bg ?
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`<rect width="100%" height="100%" fill="${bg}"/>` : '';
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const paths =
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[].concat(getLineNoise(width, height, options))
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.concat(getText(text, width, height, options))
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.sort(() => Math.random() - 0.5)
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.join('');
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const start = `<svg xmlns="http://www.w3.org/2000/svg" width="${width}" height="${height}" viewBox="0,0,${width},${height}">`;
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const xml = `${start}${bgRect}${paths}</svg>`;
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return xml;
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};
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const create = function (options) {
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const text = random.captchaText(options);
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const data = createCaptcha(text, options);
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return {text, data};
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};
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const createMathExpr = function (options) {
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const expr = random.mathExpr(options.mathMin, options.mathMax, options.mathOperator);
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const text = expr.text;
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const data = createCaptcha(expr.equation, options);
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return {text, data};
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};
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module.exports = createCaptcha;
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module.exports.randomText = random.captchaText;
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module.exports.create = create;
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module.exports.createMathExpr = createMathExpr;
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module.exports.options = opts;
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module.exports.loadFont = optionMngr.loadFont;
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