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Fix jandon pic algorithm (#219) 

* Fix jandon pic algorithm

Signed-off-by: Xuanwo <xuanwo.cn@gmail.com>

* Make eslint happy

Signed-off-by: Xuanwo <xuanwo.cn@gmail.com>

* Use Buffer.from instead for new Buffer

Signed-off-by: Xuanwo <xuanwo.cn@gmail.com>
This commit is contained in:
Xuanwo 2018-05-27 21:17:46 +08:00 committed by DIYgod
parent 2c268759b2
commit af90cf7192
1 changed files with 3 additions and 76 deletions
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79
routes/jandan/pic.js
View File

@ -1,75 +1,11 @@
const axios = require('../../utils/axios');
const cheerio = require('cheerio');
const crypto = require('crypto');
const config = require('../../config');
const md5 = (i) =>
crypto
.createHash('md5')
.update(i)
.digest()
.toString('hex');
const base64_decode = (i) => new Buffer(i, 'base64').toString('binary');
const chr = (i) => String.fromCharCode(i);
const ord = (i) => i.charCodeAt();
const time = () => parseInt(new Date().getTime() / 1000);
// jandan_magic will load a magic string from jandan's script, which will be used in jandan_decode.
const jandan_magic = async (url) => {
const script = await axios({
method: 'get',
url: 'http:' + url,
headers: {
'User-Agent': config.ua,
Referer: 'http://jandan.net',
},
});
const regex = /e,"([a-zA-Z0-9]{32})"/;
return script.data.match(regex)[1];
};
const base64_decode = (i) => Buffer.from(i, 'base64').toString('binary');
// jandan_decode is borrowed from jandan.net, which is used in function jandan_load_img.
const jandan_decode = (m, r) => {
const q = 4;
r = md5(r);
const o = md5(r.substr(0, 16));
const n = md5(r.substr(16, 16));
const l = m.substr(0, q);
const c = o + md5(o + l);
let k;
m = m.substr(q);
k = base64_decode(m);
const h = new Array(256);
for (let g = 0; g < 256; g++) {
h[g] = g;
}
const b = new Array(256);
for (let g = 0; g < 256; g++) {
b[g] = c.charCodeAt(g % c.length);
}
for (let f = 0, g = 0; g < 256; g++) {
f = (f + h[g] + b[g]) % 256;
[h[g], h[f]] = [h[f], h[g]];
}
let t = '';
k = k.split('');
for (let p = 0, f = 0, g = 0; g < k.length; g++) {
p = (p + 1) % 256;
f = (f + h[p]) % 256;
[h[p], h[f]] = [h[f], h[p]];
t += chr(ord(k[g]) ^ h[(h[p] + h[f]) % 256]);
}
if ((t.substr(0, 10) === '0' || t.substr(0, 10) - time() > 0) && t.substr(10, 16) === md5(t.substr(26) + n).substr(0, 16)) {
t = t.substr(26);
}
return t;
};
const jandan_decode = (m) => base64_decode(m);
module.exports = async (ctx) => {
const response = await axios({
@ -83,15 +19,6 @@ module.exports = async (ctx) => {
const $ = cheerio.load(response.data);
let script_url = '';
$('script').each((index, item) => {
const s = $(item).attr('src');
if (s && s.startsWith('//cdn.jandan.net/static/min/')) {
script_url = s;
}
});
const magic_string = await jandan_magic(script_url);
const items = Array();
$('.commentlist > li').each((_, item) => {
// Get current comment id, if comment_id is 'adsense', just need to skip..
@ -118,7 +45,7 @@ module.exports = async (ctx) => {
if (img_url === null) {
return;
}
img_url = jandan_decode(img_url, magic_string);
img_url = jandan_decode(img_url);
img_url = img_url.replace(/(\/\/\w+\.sinaimg\.cn\/)(\w+)(\/.+\.(gif|jpg|jpeg))/, '$1large$3');
// TODO: should load user's comments.