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