63 lines
1.4 KiB
JavaScript
63 lines
1.4 KiB
JavaScript
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/**
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* json web token
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* @author yutent<yutent.io@gmail.com>
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* @date 2020/09/16 17:23:52
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*/
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import crypto from 'crypto.js'
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import { base64encode, base64decode } from 'crypto.js'
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function hmac(str, secret) {
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var buf = crypto.hmac('sha256', str, secret, 'buffer')
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return base64encode(buf, true)
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}
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export default class Jwt {
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constructor(expires, secret) {
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this.expires = expires
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this.secret = secret
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}
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// 签名, 返回token
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sign(data) {
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// header: base64("{"typ":"JWT","alg":"HS256"}")
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// 这里固定使用sha256,
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var header = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9'
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var { expires, secret } = this
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// 加入过期时间, 同session.ttl
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var payload = { data, expires: Date.now() + expires * 1000 }
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var auth_str = ''
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payload = JSON.stringify(payload)
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payload = base64encode(payload, true)
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auth_str = hmac(`${header}.${payload}`, secret)
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return [header, payload, auth_str].join('.')
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}
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// 校验token
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verify(token) {
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var { secret } = this
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var jwt = token.split('.')
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var auth_str, payload
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if (jwt.length !== 3) {
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return false
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}
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auth_str = jwt.pop()
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payload = JSON.parse(base64decode(jwt[1], true))
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// 如果已经过期, 则不再校验hash
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if (payload.expires < Date.now()) {
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return 'expired'
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}
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if (hmac(jwt.join('.'), secret) === auth_str) {
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return payload.data
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}
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return false
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}
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}
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