65 lines
1.6 KiB
JavaScript
65 lines
1.6 KiB
JavaScript
let encode
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let encodeBuffer
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if (Buffer.isEncoding('base64url')) {
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encode = (input, encoding = 'utf8') => Buffer.from(input, encoding).toString('base64url')
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encodeBuffer = (buf) => buf.toString('base64url')
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} else {
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const fromBase64 = (base64) => base64.replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
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encode = (input, encoding = 'utf8') => fromBase64(Buffer.from(input, encoding).toString('base64'))
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encodeBuffer = (buf) => fromBase64(buf.toString('base64'))
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}
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const decodeToBuffer = (input) => {
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return Buffer.from(input, 'base64')
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}
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const decode = (input, encoding = 'utf8') => {
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return decodeToBuffer(input).toString(encoding)
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}
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const b64uJSON = {
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encode: (input) => {
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return encode(JSON.stringify(input))
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},
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decode: (input, encoding = 'utf8') => {
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return JSON.parse(decode(input, encoding))
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}
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}
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b64uJSON.decode.try = (input, encoding = 'utf8') => {
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try {
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return b64uJSON.decode(input, encoding)
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} catch (err) {
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return decode(input, encoding)
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}
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}
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const bnToBuf = (bn) => {
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let hex = BigInt(bn).toString(16)
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if (hex.length % 2) {
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hex = `0${hex}`
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}
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const len = hex.length / 2
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const u8 = new Uint8Array(len)
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let i = 0
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let j = 0
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while (i < len) {
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u8[i] = parseInt(hex.slice(j, j + 2), 16)
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i += 1
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j += 2
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}
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return u8
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}
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const encodeBigInt = (bn) => encodeBuffer(Buffer.from(bnToBuf(bn)))
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module.exports.decode = decode
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module.exports.decodeToBuffer = decodeToBuffer
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module.exports.encode = encode
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module.exports.encodeBuffer = encodeBuffer
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module.exports.JSON = b64uJSON
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module.exports.encodeBigInt = encodeBigInt
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