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jwt_auth.go
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/
jwt_auth.go
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package auth
import (
"fmt"
"net/http"
"strings"
"github.com/gin-gonic/gin"
"github.com/golang-jwt/jwt"
"github.com/justtrackio/gosoline/pkg/cfg"
)
const (
ByJWT = "jwtAuth"
headerJwtAuth = "Authorization"
)
type jwtAuthenticator struct {
jwtTokenHandler JwtTokenHandler
}
func NewJwtAuthHandler(config cfg.Config, name string) gin.HandlerFunc {
auth := NewJWTAuthAuthenticator(config, name)
return func(ginCtx *gin.Context) {
valid, err := auth.IsValid(ginCtx)
if valid {
return
}
if err == nil {
err = fmt.Errorf("the user jwt token isn't valid nor was there an error")
}
ginCtx.JSON(http.StatusUnauthorized, gin.H{"err": err.Error()})
ginCtx.Abort()
}
}
func NewJWTAuthAuthenticator(config cfg.Config, name string) Authenticator {
jwtTokenHandler := NewJwtTokenHandler(config, name)
return NewJWTAuthAuthenticatorWithInterfaces(jwtTokenHandler)
}
func NewJWTAuthAuthenticatorWithInterfaces(jwtTokenHandler JwtTokenHandler) Authenticator {
return &jwtAuthenticator{
jwtTokenHandler: jwtTokenHandler,
}
}
func (a *jwtAuthenticator) IsValid(ginCtx *gin.Context) (bool, error) {
bearerAuth := ginCtx.GetHeader(headerJwtAuth)
if bearerAuth == "" {
return false, fmt.Errorf("no credentials provided")
}
if !strings.HasPrefix(bearerAuth, "Bearer ") {
return false, fmt.Errorf("could not find jwt token in header")
}
jwtToken := bearerAuth[len("Bearer "):]
isValid, token, err := a.jwtTokenHandler.Valid(jwtToken)
if err != nil {
return false, fmt.Errorf("error while validating jwt token: %w", err)
}
if !isValid {
return false, fmt.Errorf("invalid jwt token provided")
}
subject := &Subject{
Name: token.Claims.(jwt.MapClaims)["email"].(string),
Anonymous: false,
AuthenticatedBy: ByJWT,
}
RequestWithSubject(ginCtx, subject)
return true, nil
}