nodulator
Version:
Complete NodeJS Framework for Restfull APIs
156 lines (122 loc) • 4.08 kB
JavaScript
/*
* Copyright (c) 2009 Nicholas C. Zakas. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* Base 64 implementation in JavaScript
* Original source available at https://raw.github.com/nzakas/computer-science-in-javascript/02a2745b4aa8214f2cae1bf0b15b447ca1a91b23/encodings/base64/base64.js
*
* Converted to AMD and linter refinement by Scott Andrews
*/
(function (define) {
'use strict';
/*jshint bitwise: false */
define(function (/* require */) {
var digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
/**
* Base64-encodes a string of text.
*
* @param {string} text The text to encode.
* @return {string} The base64-encoded string.
*/
function base64Encode(text) {
if (/([^\u0000-\u00ff])/.test(text)) {
throw new Error('Can\'t base64 encode non-ASCII characters.');
}
var i = 0,
cur, prev, byteNum,
result = [];
while (i < text.length) {
cur = text.charCodeAt(i);
byteNum = i % 3;
switch (byteNum) {
case 0: //first byte
result.push(digits.charAt(cur >> 2));
break;
case 1: //second byte
result.push(digits.charAt((prev & 3) << 4 | (cur >> 4)));
break;
case 2: //third byte
result.push(digits.charAt((prev & 0x0f) << 2 | (cur >> 6)));
result.push(digits.charAt(cur & 0x3f));
break;
}
prev = cur;
i += 1;
}
if (byteNum === 0) {
result.push(digits.charAt((prev & 3) << 4));
result.push('==');
} else if (byteNum === 1) {
result.push(digits.charAt((prev & 0x0f) << 2));
result.push('=');
}
return result.join('');
}
/**
* Base64-decodes a string of text.
*
* @param {string} text The text to decode.
* @return {string} The base64-decoded string.
*/
function base64Decode(text) {
//ignore white space
text = text.replace(/\s/g, '');
//first check for any unexpected input
if (!(/^[a-z0-9\+\/\s]+\={0,2}$/i.test(text)) || text.length % 4 > 0) {
throw new Error('Not a base64-encoded string.');
}
//local variables
var cur, prev, digitNum,
i = 0,
result = [];
//remove any equals signs
text = text.replace(/\=/g, '');
//loop over each character
while (i < text.length) {
cur = digits.indexOf(text.charAt(i));
digitNum = i % 4;
switch (digitNum) {
//case 0: first digit - do nothing, not enough info to work with
case 1: //second digit
result.push(String.fromCharCode(prev << 2 | cur >> 4));
break;
case 2: //third digit
result.push(String.fromCharCode((prev & 0x0f) << 4 | cur >> 2));
break;
case 3: //fourth digit
result.push(String.fromCharCode((prev & 3) << 6 | cur));
break;
}
prev = cur;
i += 1;
}
//return a string
return result.join('');
}
return {
encode: base64Encode,
decode: base64Decode
};
});
}(
typeof define === 'function' && define.amd ? define : function (factory) { module.exports = factory(require); }
// Boilerplate for AMD and Node
));