此插件用于微博图片上传的加密以及查看时的解密，加入了中值滤波以消除微博水印和压缩带来的噪声。原作者是@B1llyHerrington，
// ==UserScript==
// @name 微博图片加解密工具
// @namespace http://tampermonkey.net/
// @version 0.2.0
// @description 此插件用于微博图片上传的加密以及查看时的解密，加入了中值滤波以消除微博水印和压缩带来的噪声。原作者是@B1llyHerrington，
// @author 丸户
// @match https://weibo.com/*
// @match http://photo.weibo.com/*
// @grant none
// ==/UserScript==
//原作者 @B1llyHerrington || Github：https://github.com/xfgryujk/weibo-img-crypto
(function() {
'use strict';
window.isWbImgCryptoLoaded || (function () {
window.isWbImgCryptoLoaded = true
// 从谷歌V8引擎抄来的 https://github.com/v8/v8/blob/dae6dfe08ba9810abbe7eee81f7c58e999ae8525/src/math.js#L144
class Random {
constructor (seed) {
if (seed === undefined) {
seed = new Date().getTime()
}
this._rngstate = [seed & 0x0000FFFF, seed >>> 16]
}
// 返回[0, 1)
random () {
let r0 = (Math.imul(18030, this._rngstate[0] & 0xFFFF) + (this._rngstate[0] >>> 16)) | 0
this._rngstate[0] = r0
let r1 = (Math.imul(36969, this._rngstate[1] & 0xFFFF) + (this._rngstate[1] >>> 16)) | 0
this._rngstate[1] = r1
let x = ((r0 << 16) + (r1 & 0xFFFF)) | 0
// Division by 0x100000000 through multiplication by reciprocal.
return (x < 0 ? (x + 0x100000000) : x) * 2.3283064365386962890625e-10
}
// 返回[min, max]的整数
randint (min, max) {
return Math.floor(min + this.random() * (max - min + 1))
}
}
// 生成[0, length)的随机序列，每次调用next()返回和之前不重复的值，直到[0, length)用完
class RandomSequence {
constructor (length, seed) {
this._rng = new Random(seed)
this._list = new Array(length)
for (let i = 0; i < length; i++) {
this._list[i] = i
}
this._nextMin = 0
}
next () {
if (this._nextMin >= this._list.length) {
this._nextMin = 0
}
let index = this._rng.randint(this._nextMin, this._list.length - 1)
let result = this._list[index]
this._list[index] = this._list[this._nextMin]
this._list[this._nextMin] = result
this._nextMin++
return result
}
}
const DEFAULT_SEED = 114514 //加解密种子
function encrypt (data) {
let nRgbs = data.length / 4 * 3
let seq = new RandomSequence(nRgbs, window.randomSeed || DEFAULT_SEED)
let buffer = new Uint8ClampedArray(nRgbs)
// 每一个RGB值放到新的位置
for (let i = 0; i < data.length; i += 4) {
buffer[seq.next()] = data[i]
buffer[seq.next()] = data[i + 1]
buffer[seq.next()] = data[i + 2]
}
for (let i = 0, j = 0; i < data.length; i += 4, j += 3) {
data[i] = buffer[j]
data[i + 1] = buffer[j + 1]
data[i + 2] = buffer[j + 2]
}
}
function decrypt (data) {
let nRgbs = data.length / 4 * 3
let buffer = new Uint8ClampedArray(nRgbs)
for (let i = 0, j = 0; i < data.length; i += 4, j += 3) {
buffer[j] = data[i]
buffer[j + 1] = data[i + 1]
buffer[j + 2] = data[i + 2]
}
let seq = new RandomSequence(nRgbs, window.randomSeed || DEFAULT_SEED)
// 取新的位置，放回原来的位置
for (let i = 0; i < data.length; i += 4) {
data[i] = buffer[seq.next()]
data[i + 1] = buffer[seq.next()]
data[i + 2] = buffer[seq.next()]
}
}
//中值滤波
function median(filterWidth, filterHeight, dataArray, width, height) {
var temp = [];
for(var i=0; i<dataArray.length; i++) {
temp.push(dataArray[i]);
}
for(var x=(filterWidth-1)/2; x<width-(filterWidth-1)/2; x++) {
for(var y=(filterHeight-1)/2; y<width-(filterHeight-1)/2; y++) {
var tempArray = [];
for(var m=-(filterWidth-1)/2; m<=(filterWidth-1)/2; m++) {
for(var j=-(filterHeight-1)/2; j<=(filterHeight-1)/2; j++) {
tempArray.push(temp[(j+y)*width+m+x]);
}
}
// 泡沫排序，找出中值
do {
var loop = 0;
for(var n=0; n<tempArray.length-1; n++) {
if(tempArray[n]>tempArray[n+1]) {
var tempChange = tempArray[n];
tempArray[n] = tempArray[n+1];
tempArray[n+1] = tempChange;
loop = 1;
}
}
}while(loop);
dataArray[y*width+x] = tempArray[Math.round(tempArray.length/2)];
}
}
return dataArray;
}
let canvas = document.createElement('canvas')
let ctx = canvas.getContext('2d')
// Hook FileReader.readAsDataURL
let originalReadAsDataURL = window.FileReader.prototype.readAsDataURL
window.FileReader.prototype.readAsDataURL = function (file) {
if (file.type.startsWith('image/') && file.type !== 'image/gif') { // 暂时不支持GIF
// Hook onloadend
let originalOnloadend = this.onloadend
this.onloadend = () => {
let img = new window.Image()
img.onload = () => {
[canvas.width, canvas.height] = [img.width, img.height]
ctx.drawImage(img, 0, 0)
// 加密
let imgData = ctx.getImageData(0, 0, img.width, img.height)
encrypt(imgData.data)
ctx.putImageData(imgData, 0, 0)
// 替换上传的图片
originalOnloadend({target: {result: canvas.toDataURL()}})
}
img.src = this.result
}
}
originalReadAsDataURL.call(this, file)
}
// 监听右键菜单
document.addEventListener('contextmenu', event => {
if (event.target instanceof window.Image) {
// event.preventDefault() // 为了右键保存图片这里先注释掉了
let originImg = event.target
if (!(originImg instanceof window.Image)) {
return
}
// 跨域
let img = new window.Image()
img.crossOrigin = 'anonymous'
img.onerror = () => window.alert('载入图片失败，可能是跨域问题？')
img.onload = () => {
[canvas.width, canvas.height] = [img.width, img.height]
ctx.drawImage(img, 0, 0)
// 解密
let imgData = ctx.getImageData(0, 0, canvas.width, canvas.height)
decrypt(imgData.data)
var r=[];
var g=[];
var b=[];
for(let i=0, len=imgData.data.length; i<len; i+=4) {
r[Math.floor(i/4)] = imgData.data[i]
g[Math.floor(i/4)] = imgData.data[i+1]
b[Math.floor(i/4)] = imgData.data[i+2]
// RGB分离
}
r=median(3, 3, r, canvas.width, canvas.height)
g=median(3, 3, g, canvas.width, canvas.height)
b=median(3, 3, b, canvas.width, canvas.height)
//3*3中值滤波
for(let i=0, len2=imgData.data.length; i<len2; i+=4) {
imgData.data[i]=r[Math.floor(i/4)]
imgData.data[i+1]=g[Math.floor(i/4)]
imgData.data[i+2]=b[Math.floor(i/4)]
// 合成
}
ctx.putImageData(imgData, 0, 0)
originImg.src = canvas.toDataURL()
}
if (!originImg.src.startsWith('data:')) { // 如果是'data:'开头说明已经解密过了
// 防缓存
img.src = originImg.src + (originImg.src.indexOf('?') === -1 ? '?_t=' : '&_t=') + new Date().getTime()
}
}
})
})()
// Your code here...
})();
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