micro/auth/token/jwt/jwt.go
2020-05-21 14:56:17 +01:00

111 lines
2.4 KiB
Go

package jwt
import (
"encoding/base64"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/micro/go-micro/v2/auth"
"github.com/micro/go-micro/v2/auth/token"
)
// authClaims to be encoded in the JWT
type authClaims struct {
Type string `json:"type"`
Scopes []string `json:"scopes"`
Provider string `json:"provider"`
Metadata map[string]string `json:"metadata"`
jwt.StandardClaims
}
// JWT implementation of token provider
type JWT struct {
opts token.Options
}
// NewTokenProvider returns an initialized basic provider
func NewTokenProvider(opts ...token.Option) token.Provider {
return &JWT{
opts: token.NewOptions(opts...),
}
}
// Generate a new JWT
func (j *JWT) Generate(acc *auth.Account, opts ...token.GenerateOption) (*token.Token, error) {
// decode the private key
priv, err := base64.StdEncoding.DecodeString(j.opts.PrivateKey)
if err != nil {
return nil, err
}
// parse the private key
key, err := jwt.ParseRSAPrivateKeyFromPEM(priv)
if err != nil {
return nil, token.ErrEncodingToken
}
// parse the options
options := token.NewGenerateOptions(opts...)
// generate the JWT
expiry := time.Now().Add(options.Expiry)
t := jwt.NewWithClaims(jwt.SigningMethodRS256, authClaims{
acc.Type, acc.Scopes, acc.Provider, acc.Metadata, jwt.StandardClaims{
Subject: acc.ID,
ExpiresAt: expiry.Unix(),
},
})
tok, err := t.SignedString(key)
if err != nil {
return nil, err
}
// return the token
return &token.Token{
Token: tok,
Expiry: expiry,
Created: time.Now(),
}, nil
}
// Inspect a JWT
func (j *JWT) Inspect(t string) (*auth.Account, error) {
// decode the public key
pub, err := base64.StdEncoding.DecodeString(j.opts.PublicKey)
if err != nil {
return nil, err
}
// parse the public key
res, err := jwt.ParseWithClaims(t, &authClaims{}, func(token *jwt.Token) (interface{}, error) {
return jwt.ParseRSAPublicKeyFromPEM(pub)
})
if err != nil {
return nil, token.ErrInvalidToken
}
// validate the token
if !res.Valid {
return nil, token.ErrInvalidToken
}
claims, ok := res.Claims.(*authClaims)
if !ok {
return nil, token.ErrInvalidToken
}
// return the token
return &auth.Account{
ID: claims.Subject,
Type: claims.Type,
Scopes: claims.Scopes,
Provider: claims.Provider,
Metadata: claims.Metadata,
}, nil
}
// String returns JWT
func (j *JWT) String() string {
return "jwt"
}