From a9b84f3f3b1d92335188d43048587e32e0921079 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Wed, 2 Apr 2025 19:31:12 +0200
Subject: Init login and frontend

---
 api/auth/auth.go | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 api/auth/auth.go

(limited to 'api/auth/auth.go')

diff --git a/api/auth/auth.go b/api/auth/auth.go
new file mode 100644
index 0000000..23b4f53
--- /dev/null
+++ b/api/auth/auth.go
@@ -0,0 +1,48 @@
+package auth
+
+import (
+	"github.com/golang-jwt/jwt/v5"
+	"os"
+	"time"
+)
+
+var jwtKey = []byte(os.Getenv("JWT_SECRET"))
+
+type Claims struct {
+	UserID int `json:"user_id"`
+	jwt.RegisteredClaims
+}
+
+func GenerateJWT(userID int) (string, error) {
+	expirationTime := time.Now().Add(5 * time.Hour)
+	claims := &Claims{
+		UserID: userID,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expirationTime),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	tokenString, err := token.SignedString(jwtKey)
+	if err != nil {
+		return "", err
+	}
+	return tokenString, nil
+}
+
+func ValidateJWT(tokenString string) (*Claims, error) {
+	claims := &Claims{}
+	token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
+		return jwtKey, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if !token.Valid {
+		return nil, err
+	}
+
+	return claims, nil
+}
-- 
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