78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package middleware
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import (
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"context"
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"net/http"
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"strings"
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"5803025048/W04/internal/models"
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)
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type contextKey string
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const UserIDKey contextKey = "user_id"
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// GetUserID mengambil user id yang disimpan RequireAuth di context request.
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func GetUserID(ctx context.Context) string {
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if val, ok := ctx.Value(UserIDKey).(string); ok {
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return val
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}
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return ""
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}
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// SessionLookup adalah interface kecil yang dibutuhkan middleware:
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// mencari session (dan user id-nya) dari sebuah token.
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// *store.SessionStore memenuhi interface ini tanpa perubahan.
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type SessionLookup interface {
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Get(ctx context.Context, token string) (*models.Session, error)
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}
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type AuthMiddleware struct {
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sessions SessionLookup
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}
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func NewAuthMiddleware(sessions SessionLookup) *AuthMiddleware {
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return &AuthMiddleware{sessions: sessions}
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}
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const bearerPrefix = "Bearer "
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// BearerToken mengambil token dari header "Authorization: Bearer <token>".
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// Mengembalikan false jika header tidak ada, skema bukan Bearer, atau token kosong.
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func BearerToken(r *http.Request) (string, bool) {
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h := r.Header.Get("Authorization")
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if len(h) <= len(bearerPrefix) || !strings.EqualFold(h[:len(bearerPrefix)], bearerPrefix) {
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return "", false
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}
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token := strings.TrimSpace(h[len(bearerPrefix):])
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if token == "" {
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return "", false
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}
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return token, true
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}
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func unauthorized(w http.ResponseWriter) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusUnauthorized)
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_, _ = w.Write([]byte(`{"error":"Unauthorized"}` + "\n"))
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}
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func (m *AuthMiddleware) RequireAuth(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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token, ok := BearerToken(r)
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if !ok {
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unauthorized(w)
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return
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}
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session, err := m.sessions.Get(r.Context(), token)
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if err != nil || session == nil {
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unauthorized(w)
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return
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}
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ctx := context.WithValue(r.Context(), UserIDKey, session.UserID)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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