31 lines
1 KiB
JavaScript
31 lines
1 KiB
JavaScript
// adapted from https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-08#appendix-C
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function base64urlEncode(arg) {
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const step1 = window.btoa(arg); // Regular base64 encoder
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const step2 = step1.split("=")[0]; // Remove any trailing '='s
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const step3 = step2.replace(/\+/g, "-"); // 62nd char of encoding
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const step4 = step3.replace(/\//g, "_"); // 63rd char of encoding
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return step4;
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}
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function base64urlDecode(s) {
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const step1 = s.replace(/-/g, "+"); // 62nd char of encoding
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const step2 = step1.replace(/_/g, "/"); // 63rd char of encoding
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let step3 = step2;
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switch (step2.length % 4) { // Pad with trailing '='s
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case 0: // No pad chars in this case
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break;
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case 2: // Two pad chars
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step3 += "==";
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break;
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case 3: // One pad char
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step3 += "=";
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break;
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default:
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throw new Error("Illegal base64url string!");
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}
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return window.atob(step3); // Regular base64 decoder
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}
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const module = window.module || {};
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module.exports = { base64urlDecode, base64urlEncode };
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