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index.js
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index.js
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const axios = require('axios');
axios.defaults.timeout = 10000;
const Crypto = require("crypto-js");
const fs = require('fs');
let hummus;
const memoryStreams = require('memory-streams');
let id = 621967, merge = true, authorKey = undefined;
if (process.argv.length >= 3)
id = process.argv[2];
if (process.argv.length >= 4)
axios.defaults.timeout = process.argv[3] * 1000;
if (process.argv.length >= 5)
merge = !!+process.argv[4];
try{
hummus = require('hummus');
}
catch (e) {
merge = false
}
let deviceKey = '3uKpxtFAoOeqQQ0S';
let deviceToken = 'ebookF32BE444AF96C3BB0E71BF02D648DD9C';
console.logCopy = console.log.bind(console);
console.log = function (data) {
let currentDate = '[' + new Date().toLocaleString() + '] ';
this.logCopy(currentDate, data);
};
/**
* Concatenate PDFs in Buffers
* @param {Array} bufferList
* @param {String} name
* @returns {Promise}
*/
const combineMultiplePDFBuffers = async (bufferList, name) => {
const outStream = new memoryStreams.WritableStream();
try {
const firstPDFStream = new hummus.PDFRStreamForBuffer(bufferList[0]);
let pdfWriter = hummus.createWriterToModify(firstPDFStream, new hummus.PDFStreamForResponse(outStream));
for (let i = 1; i < bufferList.length; ++i) {
let tmpPDFStream = new hummus.PDFRStreamForBuffer(bufferList[i]);
await pdfWriter.appendPDFPagesFromPDF(tmpPDFStream);
}
pdfWriter.end();
let newBuffer = outStream.toBuffer();
outStream.end();
fs.writeFileSync(name, newBuffer);
return Promise.resolve()
} catch (e) {
outStream.end();
return Promise.reject('Error during PDF combination: ' + e.message)
}
};
function makeKey(e, t) {
var n = Crypto.enc.Utf8.parse(e);
return Crypto.AES.decrypt(t, n, {
mode: Crypto.mode.ECB,
padding: Crypto.pad.Pkcs7
})
}
function btoa(s) {
return Buffer.from(s, 'binary').toString('base64')
}
/**
* @return {string}
*/
function Uint8ToBase64(t) {
let c = "";
for (let o = 32768, a = 0, s = t.length, l; a < s;) {
l = t.subarray(a, Math.min(a + o, s));
c += String.fromCharCode.apply(null, l);
a += o;
}
return btoa(c);
}
function wordArrayToU8(t) {
let o = t.words, a = t.sigBytes, s = new Uint8Array(a), c = 0, l;
for (; c < a; c++) {
l = o[c >>> 2] >>> 24 - c % 4 * 8 & 255;
s[c] = l;
}
return s
}
const detail_param = {
'AccessToken': 'null',
'DeviceToken': deviceToken,
'ApiName': '/Content/Detail',
'BridgePlatformName': 'phei_yd_web',
'random': Math.random(),
'AppId': 3,
'id': id,
};
let detail = null, data = null;
let start = new Date().getTime();
axios.get('https://bridge.51zhy.cn/transfer/Content/Detail', {params: detail_param}).then(res => {
detail = res.data;
}).then(() => {
console.log(`开始下载:${detail['Data']['Title']}`);
let authorizeToken = detail['Data']['ExtendData']['AuthorizeToken'];
const authorize_data = {
'AccessToken': 'null',
'DeviceToken': deviceToken,
'ApiName': 'content/authorize',
'BridgePlatformName': 'phei_yd_web',
'random': Math.random(),
'AppId': 3,
'id': id,
'IsOnline': true,
'authorizeToken': authorizeToken,
};
const url_encoded = obj => Object.keys(obj).map(k => encodeURIComponent(k) + '=' + encodeURIComponent(obj[k])).join('&');
axios.post('https://bridge.51zhy.cn/transfer//content/authorize', url_encoded(authorize_data), {
headers: {'Content-Type': "application/x-www-form-urlencoded; charset=UTF-8"}
}).then(async function (response) {
data = response['data']['Data'];
if (response['data']['Code'] !== 200) {
console.log('接口失效,' + response['data']['Description']);
} else {
authorKey = makeKey(deviceKey, data['Key']);
let buffer_list = [];
if (!merge && !fs.existsSync(String(id))) {
fs.mkdirSync(String(id));
}
let page = data['SplitFileUrls'];
while (page.length) {
let new_page = [];
for (let i = 0; i < page.length; ++i) {
let page_url = page[i];
await axios.get(page_url,
{
responseType: 'arraybuffer'
})
.then((response) => {
let arrayBuffer = response.data;
let a = new Uint8Array(arrayBuffer);
let s = Uint8ToBase64(a);
let c = Crypto.AES.decrypt(s, authorKey, {
mode: Crypto.mode.ECB,
padding: Crypto.pad.Pkcs7
});
let buffer = wordArrayToU8(c);
buffer_list.push({
index: i,
buffer: buffer,
});
console.log(`已下载第${i + 1}页PDF,共下载${buffer_list.length}/${data['SplitFileUrls'].length}页`);
if (!merge) fs.writeFileSync(`${id}/${id}-${detail['Data']['Title']}-${i}.pdf`, buffer);
})
.catch((error) => {
new_page.push(page_url);
console.log(`第${i + 1}页PDF下载失败`);
});
}
page = new_page;
}
if (merge && buffer_list.length === data['SplitFileUrls'].length) {
console.log(`下载完成,开始合成PDF`);
buffer_list.sort((a, b) => {
return a.index - b.index
}
);
let result = buffer_list.map(({buffer}) => buffer);
await combineMultiplePDFBuffers(result, `${id}-${detail['Data']['Title']}.pdf`);
let end = new Date().getTime();
console.log(`下载&合成完成,共计用时:${end - start}ms`);
}
}
})
});