/
service.go
70 lines (56 loc) · 1.74 KB
/
service.go
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package jwt
//go:generate go run github.com/vektra/mockery/v2 --name=API --structname=Service --case=snake
//go:generate go run github.com/vektra/mockery/v2 --name=Config --case=snake
import (
"fmt"
"time"
jwtlib "github.com/dgrijalva/jwt-go"
)
type API interface {
TokenStringForClaims(claims map[string]string) (string, error)
ClaimsFromTokenString(tokenString string) (map[string]string, error)
}
type Config interface {
JWTSecret() string
TokenTimeout() time.Duration
}
func New(cfg Config) API {
return &service{Config: cfg}
}
type service struct {
Config Config
}
func (s *service) TokenStringForClaims(claims map[string]string) (string, error) {
mapClaims := jwtlib.MapClaims{}
for k, v := range claims {
mapClaims[k] = v
}
mapClaims["exp"] = time.Now().Add(s.Config.TokenTimeout()).Unix()
token := jwtlib.NewWithClaims(jwtlib.SigningMethodHS512, mapClaims)
tokenString, err := token.SignedString([]byte(s.Config.JWTSecret()))
if err != nil {
return "", fmt.Errorf("signing failed: %w", err)
}
return tokenString, nil
}
func (s *service) ClaimsFromTokenString(tokenString string) (map[string]string, error) {
token, err := jwtlib.Parse(tokenString, func(token *jwtlib.Token) (interface{}, error) {
if _, ok := token.Method.(*jwtlib.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return []byte(s.Config.JWTSecret()), nil
})
if err != nil {
return nil, fmt.Errorf("failed to parse jwt token: %w", err)
}
if claims, ok := token.Claims.(jwtlib.MapClaims); ok && token.Valid {
returnedClaims := map[string]string{}
for k, v := range claims {
if k != "nbf" && k != "exp" {
returnedClaims[k] = v.(string)
}
}
return returnedClaims, nil
}
return nil, err
}