add module jwt processor

go.mod

@@ -12,6 +12,7 @@ require (
 require github.com/vearutop/statigz v1.4.0 // indirect
 
 require (
+	github.com/golang-jwt/jwt/v5 v5.3.1
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/pgx/v5 v5.10.0

internal/modules/processor_jwt/interface.go

@@ -0,0 +1,24 @@
+package processor_jwt
+
+import (
+	"slices"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type JWTClaims struct {
+	UserID    int      `json:"user_id"`
+	UserEmail string   `json:"user_email"`
+	Roles     []string `json:"roles"`
+	jwt.RegisteredClaims
+}
+
+func (c *JWTClaims) HasRole(role string) bool {
+	return slices.Contains(c.Roles, role)
+}
+
+type IProcessorJWT interface {
+	GenerateAccessToken(userId int, userEmail string, userRoles []string) (string, error)
+	GenerateRefreshToken(userId int) (string, error)
+	GetClaims(token string) (*JWTClaims, error)
+}

internal/modules/processor_jwt/processor.go

@@ -0,0 +1,75 @@
+package processor_jwt
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type processor struct {
+	secret string
+}
+
+func NewProcessor(secret string) IProcessorJWT {
+	return &processor{
+		secret: secret,
+	}
+}
+
+func (p *processor) GenerateAccessToken(userId int, userEmail string, userRoles []string) (string, error) {
+	now := time.Now()
+
+	claims := &JWTClaims{
+		UserID:    userId,
+		UserEmail: userEmail,
+		Roles:     userRoles,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(now.Add(3 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(now),
+			NotBefore: jwt.NewNumericDate(now),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(p.secret)
+}
+
+func (p *processor) GenerateRefreshToken(userId int) (string, error) {
+	now := time.Now()
+
+	claims := &JWTClaims{
+		UserID: userId,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(now.Add(7 * 24 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(now),
+			NotBefore: jwt.NewNumericDate(now),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(p.secret)
+}
+
+func (p *processor) GetClaims(token string) (*JWTClaims, error) {
+	tokenWithClaims, err := jwt.ParseWithClaims(
+		token,
+		&JWTClaims{},
+		func(token *jwt.Token) (interface{}, error) {
+			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, errors.New("unexpected signing method")
+			}
+			return p.secret, nil
+		},
+	)
+	if err != nil || !tokenWithClaims.Valid {
+		return nil, errors.New("invalid or expired token")
+	}
+
+	claims, ok := tokenWithClaims.Claims.(*JWTClaims)
+	if !ok {
+		return nil, errors.New("invalid claims")
+	}
+
+	return claims, nil
+}