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jwt_parser.go
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/
jwt_parser.go
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package utils
import (
"github.com/dgrijalva/jwt-go"
"github.com/gin-gonic/gin"
"github.com/google/uuid"
"github.com/i-akbarshoh/task-manager/pkg/config"
)
type TokenMetadata struct {
UserID uuid.UUID
Credentials map[string]string
Expires int64
}
// ExtractTokenMetadata func to extract metadata from JWT.
func ExtractTokenMetadata(c *gin.Context) (*TokenMetadata, error) {
token, err := verifyToken(c)
if err != nil {
return nil, err
}
// Setting and checking token and credentials.
claims, ok := token.Claims.(jwt.MapClaims)
if ok && token.Valid {
// User ID.
userID, err := uuid.Parse(claims["id"].(string))
if err != nil {
return nil, err
}
// Expires time.
expires := claims["expires"].(float64)
// User credentials.
credentials := map[string]string{
"role": claims["role"].(string),
}
return &TokenMetadata{
UserID: userID,
Credentials: credentials,
Expires: int64(expires),
}, nil
}
return nil, err
}
func extractToken(c *gin.Context) string {
bearToken := c.GetHeader("Authorization")
return bearToken
}
func verifyToken(c *gin.Context) (*jwt.Token, error) {
tokenString := extractToken(c)
token, err := jwt.Parse(tokenString, jwtKeyFunc)
if err != nil {
return nil, err
}
return token, nil
}
func jwtKeyFunc(token *jwt.Token) (interface{}, error) {
return []byte(config.C.JWT.SigningKey), nil
}