151 lines
4.0 KiB
JavaScript
151 lines
4.0 KiB
JavaScript
// mcaptcha.js
|
|
|
|
export class Mcaptcha {
|
|
constructor(options) {
|
|
this.options = options;
|
|
this.fontSize = (options.height * 3) / 6;
|
|
this.init();
|
|
this.refresh();
|
|
}
|
|
init() {
|
|
this.ctx = uni.createCanvasContext(this.options.el);
|
|
this.ctx.setTextBaseline("middle");
|
|
this.ctx.setFillStyle(this.randomColor(180, 240));
|
|
}
|
|
refresh() {
|
|
var code = "";
|
|
var txtArr = [
|
|
"a",
|
|
"b",
|
|
"c",
|
|
"d",
|
|
"e",
|
|
"f",
|
|
"g",
|
|
"h",
|
|
"i",
|
|
"j",
|
|
"k",
|
|
"l",
|
|
"m",
|
|
"n",
|
|
"o",
|
|
"p",
|
|
"q",
|
|
"r",
|
|
"s",
|
|
"t",
|
|
"u",
|
|
"v",
|
|
"w",
|
|
"x",
|
|
"y",
|
|
"z",
|
|
"A",
|
|
"B",
|
|
"C",
|
|
"D",
|
|
"E",
|
|
"F",
|
|
"G",
|
|
"H",
|
|
"I",
|
|
"J",
|
|
"K",
|
|
"L",
|
|
"M",
|
|
"N",
|
|
"O",
|
|
"P",
|
|
"Q",
|
|
"R",
|
|
"S",
|
|
"T",
|
|
"U",
|
|
"V",
|
|
"W",
|
|
"X",
|
|
"Y",
|
|
"Z",
|
|
0,
|
|
1,
|
|
2,
|
|
3,
|
|
4,
|
|
5,
|
|
6,
|
|
7,
|
|
8,
|
|
9,
|
|
];
|
|
for (var i = 0; i < 4; i++) {
|
|
code += txtArr[this.randomNum(0, txtArr.length)];
|
|
}
|
|
this.options.createCodeImg = code;
|
|
let arr = (code + "").split("");
|
|
if (arr.length === 0) {
|
|
arr = ["e", "r", "r", "o", "r"];
|
|
}
|
|
let offsetLeft = (this.options.width * 0.6) / (arr.length - 1);
|
|
let marginLeft = this.options.width * 0.2;
|
|
arr.forEach((item, index) => {
|
|
this.ctx.setFillStyle(this.randomColor(0, 180));
|
|
let size = this.randomNum(24, this.fontSize);
|
|
this.ctx.setFontSize(size);
|
|
let dis = offsetLeft * index + marginLeft - size * 0.3;
|
|
let deg = this.randomNum(-30, 30);
|
|
this.ctx.translate(dis, this.options.height * 0.5);
|
|
this.ctx.rotate((deg * Math.PI) / 180);
|
|
this.ctx.fillText(item, 0, 0);
|
|
this.ctx.rotate((-deg * Math.PI) / 180);
|
|
this.ctx.translate(-dis, -this.options.height * 0.5);
|
|
});
|
|
for (var i = 0; i < 4; i++) {
|
|
this.ctx.strokeStyle = this.randomColor(40, 180);
|
|
this.ctx.beginPath();
|
|
this.ctx.moveTo(
|
|
this.randomNum(0, this.options.width),
|
|
this.randomNum(0, this.options.height)
|
|
);
|
|
this.ctx.lineTo(
|
|
this.randomNum(0, this.options.width),
|
|
this.randomNum(0, this.options.height)
|
|
);
|
|
this.ctx.stroke();
|
|
}
|
|
for (var i = 0; i < this.options.width / 4; i++) {
|
|
this.ctx.fillStyle = this.randomColor(0, 255);
|
|
this.ctx.beginPath();
|
|
this.ctx.arc(
|
|
this.randomNum(0, this.options.width),
|
|
this.randomNum(0, this.options.height),
|
|
1,
|
|
0,
|
|
2 * Math.PI
|
|
);
|
|
this.ctx.fill();
|
|
}
|
|
this.ctx.draw();
|
|
}
|
|
validate(code) {
|
|
var code = code.toLowerCase();
|
|
var v_code = this.options.createCodeImg.toLowerCase();
|
|
// console.log(code)
|
|
// console.log(v_code.substring(v_code.length - 4))
|
|
if (code == v_code.substring(v_code.length - 4)) {
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
randomNum(min, max) {
|
|
return Math.floor(Math.random() * (max - min) + min);
|
|
}
|
|
randomColor(min, max) {
|
|
let r = this.randomNum(min, max);
|
|
let g = this.randomNum(min, max);
|
|
let b = this.randomNum(min, max);
|
|
return "rgb(" + r + "," + g + "," + b + ")";
|
|
}
|
|
}
|