85 lines
2.4 KiB
JavaScript
85 lines
2.4 KiB
JavaScript
|
/*
|
||
|
*
|
||
|
* (c) Copyright Ascensio System Limited 2010-2021
|
||
|
*
|
||
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
* you may not use this file except in compliance with the License.
|
||
|
* You may obtain a copy of the License at
|
||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
* See the License for the specific language governing permissions and
|
||
|
* limitations under the License.
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
|
||
|
"use strict";
|
||
|
|
||
|
var Hash = function () {
|
||
|
var getHashBase64 = function (str) {
|
||
|
const crypto = require("crypto");
|
||
|
const sha256 = crypto.createHash("sha256");
|
||
|
sha256.update(str, "utf8");
|
||
|
const result = sha256.digest("base64");
|
||
|
return result;
|
||
|
};
|
||
|
|
||
|
return {
|
||
|
encode: function(str, secret) {
|
||
|
try {
|
||
|
const strHash = getHashBase64(str + secret) + "?" + str;
|
||
|
|
||
|
let data = new Buffer(strHash).toString("base64");
|
||
|
|
||
|
let cnt = 0;
|
||
|
while (data.indexOf("=") !== -1) {
|
||
|
cnt++;
|
||
|
data = data.replace("=", "");
|
||
|
}
|
||
|
|
||
|
data = (data + cnt).replace(/\+/g, "-").replace(/\//g, "_");
|
||
|
|
||
|
return data;
|
||
|
|
||
|
} catch (ex) {
|
||
|
return null;
|
||
|
}
|
||
|
},
|
||
|
decode: function(str, secret) {
|
||
|
try {
|
||
|
|
||
|
let strDecoded = Buffer.from(unescape(str), "base64").toString();
|
||
|
|
||
|
const lastIndex = strDecoded.lastIndexOf("}");
|
||
|
|
||
|
if (lastIndex + 1 < strDecoded.length) {
|
||
|
strDecoded = strDecoded.substring(0, lastIndex + 1);
|
||
|
}
|
||
|
|
||
|
const index = strDecoded.indexOf("?");
|
||
|
|
||
|
if (index > 0 && strDecoded[index + 1] == '{') {
|
||
|
let hash = strDecoded.substring(0, index);
|
||
|
let data = strDecoded.substring(index + 1);
|
||
|
if(getHashBase64(data + secret) === hash)
|
||
|
{
|
||
|
return data;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Sig incorrect
|
||
|
return null;
|
||
|
|
||
|
} catch (ex) {
|
||
|
console.error("hash.decode", str, secret, ex);
|
||
|
return null;
|
||
|
}
|
||
|
}
|
||
|
};
|
||
|
};
|
||
|
|
||
|
module.exports = Hash();
|
||
|
|