feat: update jwt manager for auth service

devto-grpc/pkg/jwtool/manager.go

@@ -1,6 +1,7 @@
 package jwtool
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/dgrijalva/jwt-go"
@@ -35,6 +36,28 @@ func (m *Manager) Generate(user *model.User) (string, error) {
 	return token.SignedString([]byte(m.secretKey))
 }
 
+// Verify parse user claims from token
+func (m *Manager) Verify(accessToken string) (*UserClaims, error) {
+	keyFunc := func(token *jwt.Token) (any, error) {
+		_, ok := token.Method.(*jwt.SigningMethodHMAC)
+		if !ok {
+			return nil, fmt.Errorf("unexpected token signed method")
+		}
+		return []byte(m.secretKey), nil
+	}
+
+	token, err := jwt.ParseWithClaims(accessToken, &UserClaims{}, keyFunc)
+	if err != nil {
+		return nil, fmt.Errorf("invalid token: %w", err)
+	}
+
+	claims, ok := token.Claims.(*UserClaims)
+	if !ok {
+		return nil, fmt.Errorf("invalid token claims")
+	}
+	return claims, nil
+}
+
 // UserClaims stands for user claim
 type UserClaims struct {
 	Username string `json:"username"`

devto-grpc/proto/login.proto

@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package proto;
+
+option go_package = "./repo";
+
+message LoginRequest {
+    string username = 1;
+    string password = 2;
+}
+
+message LoginResponse {
+    string accessToken = 1;
+}
+
+service AuthService {
+    rpc Login(LoginRequest) returns (LoginResponse) {};
+}