82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package jwt
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import (
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"crypto/rand"
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"net/http"
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"time"
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"github.com/go-chi/jwtauth"
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"github.com/dgrijalva/jwt-go"
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"github.com/spf13/viper"
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)
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// TokenAuth implements JWT authentication flow.
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type TokenAuth struct {
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JwtAuth *jwtauth.JWTAuth
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JwtExpiry time.Duration
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JwtRefreshExpiry time.Duration
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}
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// NewTokenAuth configures and returns a JWT authentication instance.
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func NewTokenAuth() (*TokenAuth, error) {
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secret := viper.GetString("auth_jwt_secret")
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if secret == "random" {
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secret = randStringBytes(32)
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}
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a := &TokenAuth{
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JwtAuth: jwtauth.New("HS256", []byte(secret), nil),
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JwtExpiry: viper.GetDuration("auth_jwt_expiry"),
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JwtRefreshExpiry: viper.GetDuration("auth_jwt_refresh_expiry"),
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}
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return a, nil
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}
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// Verifier http middleware will verify a jwt string from a http request.
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func (a *TokenAuth) Verifier() func(http.Handler) http.Handler {
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return jwtauth.Verifier(a.JwtAuth)
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}
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// GenTokenPair returns both an access token and a refresh token.
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func (a *TokenAuth) GenTokenPair(ca jwt.MapClaims, cr jwt.MapClaims) (string, string, error) {
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access, err := a.CreateJWT(ca)
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if err != nil {
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return "", "", err
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}
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refresh, err := a.CreateRefreshJWT(cr)
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if err != nil {
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return "", "", err
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}
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return access, refresh, nil
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}
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// CreateJWT returns an access token for provided account claims.
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func (a *TokenAuth) CreateJWT(c jwt.MapClaims) (string, error) {
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jwtauth.SetIssuedNow(c)
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jwtauth.SetExpiryIn(c, a.JwtExpiry)
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_, tokenString, err := a.JwtAuth.Encode(c)
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return tokenString, err
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}
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// CreateRefreshJWT returns a refresh token for provided token Claims.
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func (a *TokenAuth) CreateRefreshJWT(c jwt.MapClaims) (string, error) {
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jwtauth.SetIssuedNow(c)
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jwtauth.SetExpiryIn(c, a.JwtRefreshExpiry)
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_, tokenString, err := a.JwtAuth.Encode(c)
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return tokenString, err
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}
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const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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func randStringBytes(n int) string {
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buf := make([]byte, n)
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if _, err := rand.Read(buf); err != nil {
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panic(err)
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}
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for k, v := range buf {
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buf[k] = letterBytes[v%byte(len(letterBytes))]
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}
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return string(buf)
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}
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