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57 lines
1.5 KiB
57 lines
1.5 KiB
const gm = require('gm').subClass({ imageMagick: true })
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, rr = (min, max) => Math.floor(Math.random() * (max-min + 1) + min)
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, width = 200
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, height = 80
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, distortion = 15
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module.exports = (text, captchaId) => {
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return new Promise((resolve, reject) => {
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const recy = rr(35,45);
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const distorts = [];
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const numDistorts = rr(3,5);
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const div = width/numDistorts;
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for (let i = 0; i < numDistorts; i++) {
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const originx = rr((div*i)+distortion, (div*(i+1))-distortion);
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const originy = rr(distortion,height-distortion);
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const destx = rr(Math.max(distortion,originx-distortion),Math.min(width-distortion,originx+distortion));
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const desty = rr(Math.max(distortion,originy-distortion*2),Math.min(height-distortion,originy+distortion*2));
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distorts.push([
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{x:originx,y:originy}, //origin
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{x:destx,y:desty} //dest
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]);
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}
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const x = gm(width,height, '#333333')
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.fill('#bbbbbb')
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.fontSize(65)
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let lastx = 7;
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for (let i = 0; i <6; i++) {
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x.drawText(lastx, 60, text[i])
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switch (text[i]) {
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case 'w':
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case 'm':
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lastx += 45;
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break;
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case 'i':
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case 'f':
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case 'l':
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case 'j':
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case 't':
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lastx += 15;
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break;
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default:
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lastx += 30;
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break;
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}
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}
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//.drawText(5, 60, text)
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x.drawRectangle(5, recy, 195, recy+4)
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.distort(distorts, 'Shepards')
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//.quality(10)
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.write(`./static/captcha/${captchaId}.jpg`, (err) => {
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if (err) {
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return reject(err);
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}
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return resolve();
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});
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})
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}
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