install go2rtc on bob

installs_on_host/go2rtc/internal/echo/echo.go

@@ -0,0 +1,46 @@
+package echo
+
+import (
+	"bytes"
+	"errors"
+	"os/exec"
+	"slices"
+
+	"github.com/AlexxIT/go2rtc/internal/app"
+	"github.com/AlexxIT/go2rtc/internal/streams"
+	"github.com/AlexxIT/go2rtc/pkg/shell"
+)
+
+func Init() {
+	var cfg struct {
+		Mod struct {
+			AllowPaths []string `yaml:"allow_paths"`
+		} `yaml:"echo"`
+	}
+
+	app.LoadConfig(&cfg)
+
+	allowPaths := cfg.Mod.AllowPaths
+
+	log := app.GetLogger("echo")
+
+	streams.RedirectFunc("echo", func(url string) (string, error) {
+		args := shell.QuoteSplit(url[5:])
+
+		if allowPaths != nil && !slices.Contains(allowPaths, args[0]) {
+			return "", errors.New("echo: bin not in allow_paths: " + args[0])
+		}
+
+		b, err := exec.Command(args[0], args[1:]...).Output()
+		if err != nil {
+			return "", err
+		}
+
+		b = bytes.TrimSpace(b)
+
+		log.Debug().Str("url", url).Msgf("[echo] %s", b)
+
+		return string(b), nil
+	})
+	streams.MarkInsecure("echo")
+}