1 files changed, 44 insertions, 2 deletions

diff --git a/internal/admin/api_helpers.go b/internal/admin/api_helpers.go
index 11ad958..37cc4ae 100644
--- a/internal/admin/api_helpers.go
+++ b/internal/admin/api_helpers.go
@@ -3,10 +3,13 @@ package admin
 import (
 	"bytes"
 	"fmt"
-	"os"
+	"path/filepath"
 	"strings"
 
 	"gopkg.in/yaml.v3"
+
+	"thehouseoficarus/internal/persistence"
+	"thehouseoficarus/internal/world"
 )
 
 // validEntityID reports whether an entity ID can be safely joined into a
@@ -23,6 +26,45 @@ func validEntityID(id string) bool {
 	return true
 }
 
+// resolveRoomSubdir validates a client-supplied room subdirectory and returns
+// the cleaned path relative to <dataDir>/rooms. Absolute paths, ".." escapes,
+// drive-like prefixes, and backslashes are rejected; the empty string is the
+// rooms root. Room-directory API handlers must route body.Dir/patch.Dir through
+// this before joining, mirroring validEntityID/resolveDataPath elsewhere.
+func (s *AdminServer) resolveRoomSubdir(dir string) (string, error) {
+	dir = strings.TrimSpace(dir)
+	if dir == "" {
+		return "", nil
+	}
+	if filepath.IsAbs(dir) || strings.ContainsRune(dir, '\\') || strings.ContainsRune(dir, 0) {
+		return "", fmt.Errorf("invalid directory")
+	}
+	clean := filepath.Clean(dir)
+	if clean == "." {
+		return "", nil
+	}
+	if clean == ".." || strings.HasPrefix(clean, ".."+string(filepath.Separator)) {
+		return "", fmt.Errorf("directory escapes the rooms tree")
+	}
+	base := filepath.Join(s.dataDir, "rooms")
+	rel, err := filepath.Rel(base, filepath.Join(base, clean))
+	if err != nil || rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
+		return "", fmt.Errorf("directory escapes the rooms tree")
+	}
+	return clean, nil
+}
+
+// validateRoomSchema decodes a rendered room YAML into world.Room before it is
+// written, so the editor cannot persist a room the runtime loader would later
+// reject (for example a non-numeric exit target). KnownFields(true) also
+// catches keys the runtime would silently ignore.
+func validateRoomSchema(content []byte) error {
+	dec := yaml.NewDecoder(bytes.NewReader(content))
+	dec.KnownFields(true)
+	var room world.Room
+	return dec.Decode(&room)
+}
+
 func yamlToMap(data []byte) (map[string]any, error) {
 	var v any
 	if err := yaml.Unmarshal(data, &v); err != nil {
@@ -65,7 +107,7 @@ func writeMapAsYAML(path string, m map[string]any) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	if err := os.WriteFile(path, content, 0644); err != nil {
+	if err := persistence.WriteFile(path, content, 0644); err != nil {
 		return nil, err
 	}
 	return content, nil