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