feat: Waku v2 bridge

Issue #12610

vendor/github.com/anacrolix/torrent/version/version.go

@@ -0,0 +1,58 @@
+// Package version provides default versions, user-agents etc. for client identification.
+package version
+
+import (
+	"fmt"
+	"reflect"
+	"runtime/debug"
+)
+
+var (
+	DefaultExtendedHandshakeClientVersion string
+	// This should be updated when client behaviour changes in a way that other peers could care
+	// about.
+	DefaultBep20Prefix   = "-GT0003-"
+	DefaultHttpUserAgent string
+	DefaultUpnpId        string
+)
+
+func init() {
+	const (
+		longNamespace   = "anacrolix"
+		longPackageName = "torrent"
+	)
+	type Newtype struct{}
+	var newtype Newtype
+	thisPkg := reflect.TypeOf(newtype).PkgPath()
+	var (
+		mainPath       = "unknown"
+		mainVersion    = "unknown"
+		torrentVersion = "unknown"
+	)
+	if buildInfo, ok := debug.ReadBuildInfo(); ok {
+		mainPath = buildInfo.Main.Path
+		mainVersion = buildInfo.Main.Version
+		// Note that if the main module is the same as this module, we get a version of "(devel)".
+		for _, dep := range append(buildInfo.Deps, &buildInfo.Main) {
+			if dep.Path == thisPkg {
+				torrentVersion = dep.Version
+			}
+		}
+	}
+	DefaultExtendedHandshakeClientVersion = fmt.Sprintf(
+		"%v %v (%v/%v %v)",
+		mainPath,
+		mainVersion,
+		longNamespace,
+		longPackageName,
+		torrentVersion,
+	)
+	DefaultUpnpId = fmt.Sprintf("%v %v", mainPath, mainVersion)
+	// Per https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent#library_and_net_tool_ua_strings
+	DefaultHttpUserAgent = fmt.Sprintf(
+		"%v-%v/%v",
+		longNamespace,
+		longPackageName,
+		torrentVersion,
+	)
+}