66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
package middleware
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import (
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"context"
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"net/http"
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"os"
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"strings"
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"github.com/golang-jwt/jwt/v5"
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)
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type contextKey string
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const UserIDKey contextKey = "userID"
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func JWTAuth(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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authHeader := r.Header.Get("Authorization")
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if authHeader == "" {
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http.Error(w, `{"code":401, "message":"Unauthorized: missing token"}`, http.StatusUnauthorized)
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return
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}
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parts := strings.Split(authHeader, " ")
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if len(parts) != 2 || parts[0] != "Bearer" {
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http.Error(w, `{"code":401, "message":"Unauthorized: invalid token format"}`, http.StatusUnauthorized)
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return
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}
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tokenString := parts[1]
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secret := os.Getenv("JWT_SECRET")
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token, err := jwt.Parse(tokenString, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, jwt.ErrSignatureInvalid
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}
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return []byte(secret), nil
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})
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if err != nil || !token.Valid {
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http.Error(w, `{"code":401, "message":"Unauthorized: invalid or expired token"}`, http.StatusUnauthorized)
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return
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}
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claims, ok := token.Claims.(jwt.MapClaims)
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if !ok {
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http.Error(w, `{"code":401, "message":"Unauthorized: invalid token claims"}`, http.StatusUnauthorized)
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return
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}
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userID, ok := claims["sub"].(string)
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if !ok || userID == "" {
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// fallback check inside user_id or id if sub doesn't exist
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userID, _ = claims["user_id"].(string)
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}
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if userID == "" {
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http.Error(w, `{"code":401, "message":"Unauthorized: user ID not found in token"}`, http.StatusUnauthorized)
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return
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}
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ctx := context.WithValue(r.Context(), UserIDKey, userID)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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