chore: initial public commit

engine/middleware/hosts.go

@@ -0,0 +1,24 @@
+package middleware
+
+import (
+	"net/http"
+	"slices"
+
+	"github.com/gabehf/koito/internal/cfg"
+	"github.com/gabehf/koito/internal/logger"
+)
+
+func AllowedHosts(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		l := logger.Get()
+		if cfg.AllowAllHosts() {
+			next.ServeHTTP(w, r)
+			return
+		} else if slices.Contains(cfg.AllowedHosts(), r.Host) {
+			next.ServeHTTP(w, r)
+			return
+		}
+		l.Warn().Msgf("Request denied from host %s. If you want to allow requests like this, add the host to your %s variable", r.Host, cfg.ALLOWED_HOSTS_ENV)
+		w.WriteHeader(http.StatusForbidden)
+	})
+}