Fix image load error caused by CSP(Content Security Policy)
// ==UserScript==
// @name fix-image-error at inoreader
// @name:zh-CN 修复inoreader图片异常
// @version 0.5.0
// @namespace https://github.com/mengtao-code
// @description Fix image load error caused by CSP(Content Security Policy)
// @description:zh-CN 修复inoreader的图片加载问题
// @author Mengtao Xin
// @license MIT
// @supportURL https://github.com/mengtao-code/tampermonkey-scripts
// @include http*://*.inoreader.com/*
// @icon http://www.inoreader.com/favicon.ico
// @grant GM_xmlhttpRequest
// @connect *
// ==/UserScript==
const LOADING_PROMPT = 'Loading...'
const config = {
name: 'fix-image-error',
data: [
// weibo images prefix
{
imageServer: 'sinaimg.cn',
mockHeader: {
Referer: 'https://weibo.com'
}
}
]
}
/**
*
* @link https://stackoverflow.com/questions/8778863/downloading-an-image-using-xmlhttprequest-in-a-userscript
* @param {string} input
* @returns {string}
*/
function toBase64(input) {
var bbLen = 3,
enCharLen = 4,
inpLen = input.length,
inx = 0,
jnx,
keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' + '0123456789+/=',
output = '',
paddingBytes = 0
var bytebuffer = new Array(bbLen),
encodedCharIndexes = new Array(enCharLen)
while (inx < inpLen) {
for (jnx = 0; jnx < bbLen; ++jnx) {
if (inx < inpLen) bytebuffer[jnx] = input.charCodeAt(inx++) & 0xff
else bytebuffer[jnx] = 0
}
encodedCharIndexes[0] = bytebuffer[0] >> 2
encodedCharIndexes[1] = ((bytebuffer[0] & 0x3) << 4) | (bytebuffer[1] >> 4)
encodedCharIndexes[2] = ((bytebuffer[1] & 0x0f) << 2) | (bytebuffer[2] >> 6)
encodedCharIndexes[3] = bytebuffer[2] & 0x3f
paddingBytes = inx - (inpLen - 1)
switch (paddingBytes) {
case 1:
// Set last character to padding char
encodedCharIndexes[3] = 64
break
case 2:
// Set last 2 characters to padding char
encodedCharIndexes[3] = 64
encodedCharIndexes[2] = 64
break
default:
break // No padding - proceed
}
for (jnx = 0; jnx < enCharLen; ++jnx) output += keyStr.charAt(encodedCharIndexes[jnx])
}
return output
}
/**
*
* @param responseData data from http request
* @returns {string}
*/
const getImageUrl = responseData => {
const binResp = toBase64(responseData.responseText)
return `data:image/jpeg;base64,${binResp}`
}
/**
* send get http request
* @param {string}url
* @param customHeader
* @returns {Promise<unknown>}
*/
const httpGetRequest = (url, customHeader) => {
return new Promise((resolve, reject) => {
GM.xmlHttpRequest({
method: 'GET',
url: url,
headers: {
Accept: '*/*',
referrerPolicy: 'no-referrer',
...customHeader
},
onload: resolve,
onerror: reject,
overrideMimeType: 'text/plain; charset=x-user-defined'
})
})
}
/**
*
* @param {Element} dom
* @param {*} mockHeader
*/
const processDetailImage = (dom, mockHeader) => {
if (dom.getAttribute('process-tag') !== 'doing' && dom.getAttribute('process-tag') !== 'done') {
dom.setAttribute('process-tag', 'doing')
dom.setAttribute('alt', LOADING_PROMPT)
const originUrl = dom.getAttribute('src')
httpGetRequest(originUrl, mockHeader)
.then(responseData => {
const goodUrl = getImageUrl(responseData)
dom.setAttribute('src', goodUrl)
})
.catch(e => console.error(`${config.name} load image failed! ${e}`))
.finally(() => dom.setAttribute('process-tag', 'done'))
}
}
const processListImage = (dom, mockHeader) => {
if (dom.getAttribute('process-tag') !== 'doing' && dom.getAttribute('process-tag') !== 'done') {
dom.setAttribute('process-tag', 'doing')
const style = dom.getAttribute('style')
const originUrl = style.substring(style.indexOf('https')).replace("')", '')
console.log(`originUrl:${originUrl}`)
httpGetRequest(originUrl, mockHeader)
.then(responseData => {
const goodUrl = getImageUrl(responseData)
dom.setAttribute('style', `background-image:url('${goodUrl}')`)
})
.catch(e => console.error(`${config.name} load image failed! ${e}`))
.finally(() => dom.setAttribute('process-tag', 'done'))
}
}
/**
* 检测到有异常图片，就调整成正常的图片
*/
const main = () => {
config.data.forEach(({ imageServer, mockHeader }) => {
// 1. detail pages
Array.from(document.querySelectorAll(`.article_content img[src*='${imageServer}']`)).forEach(image => processDetailImage(image, mockHeader))
// 2. list pages
Array.from(document.querySelectorAll(`.article_magazine_picture, .article_tile_picture`))
.filter(dom => dom.getAttribute('style').includes(imageServer))
.forEach(image => processListImage(image, mockHeader))
})
}
setInterval(main, 3000)