| 1 | const base64url = require('../help/base64url')
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| 2 | const errors = require('../errors')
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| 3 |
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| 4 | module.exports = (token, { complete = false } = {}) => {
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| 5 | if (typeof token !== 'string' || !token) {
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| 6 | throw new TypeError('JWT must be a string')
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| 7 | }
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| 8 |
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| 9 | const { 0: header, 1: payload, 2: signature, length } = token.split('.')
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| 10 |
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| 11 | if (length === 5) {
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| 12 | throw new TypeError('JWTs must be decrypted first')
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| 13 | }
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| 14 |
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| 15 | if (length !== 3) {
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| 16 | throw new errors.JWTMalformed('JWTs must have three components')
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| 17 | }
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| 18 |
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| 19 | try {
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| 20 | const result = {
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| 21 | header: base64url.JSON.decode(header),
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| 22 | payload: base64url.JSON.decode(payload),
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| 23 | signature
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| 24 | }
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| 25 |
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| 26 | return complete ? result : result.payload
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| 27 | } catch (err) {
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| 28 | throw new errors.JWTMalformed('JWT is malformed')
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| 29 | }
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| 30 | }
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