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85 lines
2.2 KiB
85 lines
2.2 KiB
'use strict';
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const gm = require('@fatchan/gm').subClass({ imageMagick: true })
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, { Captchas } = require(__dirname+'/../../../db/')
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, config = require(__dirname+'/../../misc/config.js')
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, uploadDirectory = require(__dirname+'/../../file/uploaddirectory.js')
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, characterWidth = (char) => {
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switch (char) {
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case 'w':
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case 'm':
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return 45;
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case 'i':
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case 'l':
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return 12;
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case 'f':
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case 'j':
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case 't':
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return 15;
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default:
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return 30;
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}
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}
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, totalWidth = (text) => {
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return text.split('').reduce((acc, char) => {
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return characterWidth(char) + acc + 1;
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}, 0);
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}
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, width = 210
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, height = 80
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, minVal = parseInt('1000000', 36)
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, maxVal = parseInt('1zzzzzz', 36)
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, { promisify } = require('util')
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, randomRange = promisify(require('crypto').randomInt)
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, getDistorts = require(__dirname+'/../getdistorts.js');
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module.exports = async () => {
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const { captchaOptions } = config.get;
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/* generate random between 1000000 and 1zzzzzz and not 0 and zzzzzz, so output will have
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enough characters for 000000-zzzzzz */
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const textInt = await randomRange(minVal, maxVal+1);
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const text = textInt.toString(36).substr(-6, 6);
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//insert the captcha to db and get id
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const captchaId = await Captchas.insertOne(text).then(r => r.insertedId);
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//y position for line through text
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const lineY = await randomRange(35,45);
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const captcha = gm(width,height,'#ffffff')
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.fill('#000000')
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.fontSize(65);
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//draw each character at their x based on the characterWidth()
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const startX = (width-totalWidth(text))/2;
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let charX = startX;
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for (let i = 0; i < 6; i++) {
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captcha.drawText(charX, 60, text[i]);
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charX += characterWidth(text[i]);
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}
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captcha.drawRectangle(startX, lineY, charX, lineY+4);
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//create an array of distortions and apply to the image, if distortion is enabled
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const { distortion, numDistorts } = captchaOptions;
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if (distortion > 0) {
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const distorts = await getDistorts(width, height, numDistorts, distortion);
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captcha.distort(distorts, 'Shepards');
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}
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captcha.paint(2); //paint effect makes a bit harder
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return new Promise((resolve, reject) => {
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captcha
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.write(`${uploadDirectory}/captcha/${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({ captchaId });
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});
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});
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};
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