23 lines
650 B
JavaScript
23 lines
650 B
JavaScript
import assertString from './util/assertString';
|
|
import merge from './util/merge';
|
|
var notBase64 = /[^A-Z0-9+\/=]/i;
|
|
var urlSafeBase64 = /^[A-Z0-9_\-]*$/i;
|
|
var defaultBase64Options = {
|
|
urlSafe: false
|
|
};
|
|
export default function isBase64(str, options) {
|
|
assertString(str);
|
|
options = merge(options, defaultBase64Options);
|
|
var len = str.length;
|
|
|
|
if (options.urlSafe) {
|
|
return urlSafeBase64.test(str);
|
|
}
|
|
|
|
if (len % 4 !== 0 || notBase64.test(str)) {
|
|
return false;
|
|
}
|
|
|
|
var firstPaddingChar = str.indexOf('=');
|
|
return firstPaddingChar === -1 || firstPaddingChar === len - 1 || firstPaddingChar === len - 2 && str[len - 1] === '=';
|
|
} |