通过 JavaScript 进行 Base64URL 解码?
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Base64URL decoding via JavaScript?
提问by chrisfullman
So I'm stumped. I know there's lots of Base64 encoders/decoders for JS, but not for the modified (and Facebook-favored) Base64URL variation. So far searching across stackoverflow has come up dry.
所以我很难过。我知道有很多用于 JS 的 Base64 编码器/解码器,但不适用于修改后的(和 Facebook 支持的)Base64URL 变体。到目前为止,在 stackoverflow 上搜索已经枯竭。
Yes, I could use PHP or another server-side library to decode this, but I'm trying to keep this universal regardless of what platform I'm using... for example, if I were to host a HTML-only Facebook app on Amazon S3/CloudFront and only use their JS SDK and jQuery to take care of processing forms and getting data.
是的,我可以使用 PHP 或其他服务器端库来对此进行解码,但是无论我使用什么平台,我都试图保持这种通用性……例如,如果我要托管一个纯 HTML 的 Facebook 应用程序在 Amazon S3/CloudFront 上,只使用他们的 JS SDK 和 jQuery 来处理表单和获取数据。
That said, does anyone know of any Base64URL-specific decoders for JavaScript?
也就是说,有没有人知道任何针对 JavaScript 的 Base64URL 特定的解码器?
Thanks in advance!
提前致谢!
回答by mohamad
Use this before decoding :
在解码之前使用它:
var decode = function(input) {
// Replace non-url compatible chars with base64 standard chars
input = input
.replace(/-/g, '+')
.replace(/_/g, '/');
// Pad out with standard base64 required padding characters
var pad = input.length % 4;
if(pad) {
if(pad === 1) {
throw new Error('InvalidLengthError: Input base64url string is the wrong length to determine padding');
}
input += new Array(5-pad).join('=');
}
return input;
}
After using this function you can use any base64 decoder
使用此功能后,您可以使用任何base64解码器
回答by Simeon
Solution:
解决方案:
var b64str = base64.encode('foo bar');
// fix padding according to the new format
b64str = b64str.padRight(b64str.length + (4 - b64str.length % 4) % 4, '=');
Using this great base64 encode/decode: http://code.google.com/p/stringencoders/source/browse/trunk/javascript/base64.js
使用这个很棒的 base64 编码/解码:http: //code.google.com/p/stringencoders/source/browse/trunk/javascript/base64.js
Also depends on the padRight method:
还取决于 padRight 方法:
String.prototype.padRight = function(n, pad){
t = this;
if(n > this.length)
for(i = 0; i < n-this.length; i++)
t += pad;
return t;
}
回答by The Mask
var str = "string";
var encoded = btoa(str); // encode a string (base64)
var decoded = atob(encoded); //decode the string
alert( ["string base64 encoded:",encoded,"\r\n", "string base64 decoded:",decoded].join('') );