pre cw with probe and a bunch script to read game behavior

internal/common/srtool_session.go

@@ -0,0 +1,66 @@
+package common
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+type SrtoolConfig struct {
+	LeaseFile    string `json:"lease_file"`
+	LeaseSeconds uint32 `json:"lease_seconds"`
+}
+type srtoolLease struct {
+	ExpiresAt int64 `json:"expires_at"`
+}
+
+// This is an expiring tool connection, not a persisted gameplay preference.
+// A stale FreeSR file alone must never enable custom encounters.
+func SetSrtoolConnection(connected bool) (uint32, error) {
+	cfg, err := LoadRuntimeConfig()
+	if err != nil {
+		return 0, err
+	}
+	lease := srtoolLease{}
+	if connected {
+		lease.ExpiresAt = time.Now().Add(time.Duration(cfg.Srtool.LeaseSeconds) * time.Second).UnixMilli()
+	}
+	if err = os.MkdirAll(filepath.Dir(cfg.Srtool.LeaseFile), 0700); err != nil {
+		return 0, err
+	}
+	raw, err := json.Marshal(lease)
+	if err != nil {
+		return 0, err
+	}
+	f, err := os.CreateTemp(filepath.Dir(cfg.Srtool.LeaseFile), ".tool-session-*.tmp")
+	if err != nil {
+		return 0, err
+	}
+	name := f.Name()
+	defer os.Remove(name)
+	if _, err = f.Write(raw); err != nil {
+		f.Close()
+		return 0, err
+	}
+	if err = f.Close(); err != nil {
+		return 0, err
+	}
+	if err = os.Rename(name, cfg.Srtool.LeaseFile); err != nil {
+		return 0, fmt.Errorf("save tool connection: %w", err)
+	}
+	return cfg.Srtool.LeaseSeconds, nil
+}
+func SrtoolCustomBattleActive() bool {
+	cfg, err := LoadRuntimeConfig()
+	if err != nil {
+		return false
+	}
+	raw, err := os.ReadFile(cfg.Srtool.LeaseFile)
+	if err != nil {
+		return false
+	}
+	var lease srtoolLease
+	return json.Unmarshal(raw, &lease) == nil && lease.ExpiresAt > time.Now().UnixMilli()
+}