feat: add WebRTC Direct support

config/swarm.go

@@ -102,8 +102,9 @@ type Transports struct {
 		TCP       Flag `json:",omitempty"`
 		Websocket Flag `json:",omitempty"`
 		Relay     Flag `json:",omitempty"`
-		// except WebTransport which is experimental and optin.
+		// except WebTransport and WebRTCDirect which are experimental and opt-in.
 		WebTransport Flag `json:",omitempty"`
+		WebRTCDirect Flag `json:",omitempty"`
 	}
 
 	// Security specifies the transports used to encrypt insecure network

core/node/libp2p/transport.go

@@ -8,6 +8,7 @@ import (
 	"github.com/libp2p/go-libp2p/core/metrics"
 	quic "github.com/libp2p/go-libp2p/p2p/transport/quic"
 	"github.com/libp2p/go-libp2p/p2p/transport/tcp"
+	webrtc "github.com/libp2p/go-libp2p/p2p/transport/webrtc"
 	"github.com/libp2p/go-libp2p/p2p/transport/websocket"
 	webtransport "github.com/libp2p/go-libp2p/p2p/transport/webtransport"
 
@@ -49,6 +50,15 @@ func Transports(tptConfig config.Transports) interface{} {
 			opts.Opts = append(opts.Opts, libp2p.Transport(webtransport.New))
 		}
 
+		if tptConfig.Network.WebRTCDirect.WithDefault(!privateNetworkEnabled) {
+			if privateNetworkEnabled {
+				return opts, fmt.Errorf(
+					"WebRTC transport does not support private networks, please disable Swarm.Transports.Network.WebRTC",
+				)
+			}
+			opts.Opts = append(opts.Opts, libp2p.Transport(webrtc.New))
+		}
+
 		return opts, nil
 	}
 }

docs/config.md

@@ -2072,6 +2072,19 @@ Default: Enabled
 
 Type: `flag`
 
+#### `Swarm.Transports.Network.WebRTCDirect`
+
+A new feature of [`go-libp2p`](https://github.com/libp2p/go-libp2p/releases/tag/v0.32.0)
+is the [WebRTC Direct](https://github.com/libp2p/go-libp2p/pull/2337) transport.
+
+WebRTC Direct is a transport protocol that provides another way for browsers to connect to the rest of the libp2p network. WebRTC Direct allows for browser nodes to connect to other nodes without special configuration, such as TLS certificates. This can be useful for browser nodes that do not yet support WebTransport, for example.
+
+Note that, at the moment, WebRTC Direct cannot be used to connect to a browser node to a node that is behind a NAT or firewall. This is being worked on [`go-libp2p#2009`](https://github.com/libp2p/go-libp2p/issues/2009).
+
+Default: Enabled
+
+Type: `flag`
+
 ### `Swarm.Transports.Security`
 
 Configuration section for libp2p _security_ transports. Transports enabled in

docs/examples/kubo-as-a-library/go.mod

@@ -30,6 +30,7 @@ require (
 	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
 	github.com/crackcomm/go-gitignore v0.0.0-20170627025303-887ab5e44cc3 // indirect
 	github.com/cskr/pubsub v1.0.2 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/davidlazar/go-crypto v0.0.0-20200604182044-b73af7476f6c // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
 	github.com/dgraph-io/badger v1.6.2 // indirect
@@ -142,7 +143,24 @@ require (
 	github.com/openzipkin/zipkin-go v0.4.1 // indirect
 	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/petar/GoLLRB v0.0.0-20210522233825-ae3b015fd3e9 // indirect
+	github.com/pion/datachannel v1.5.5 // indirect
+	github.com/pion/dtls/v2 v2.2.7 // indirect
+	github.com/pion/ice/v2 v2.3.6 // indirect
+	github.com/pion/interceptor v0.1.17 // indirect
+	github.com/pion/logging v0.2.2 // indirect
+	github.com/pion/mdns v0.0.7 // indirect
+	github.com/pion/randutil v0.1.0 // indirect
+	github.com/pion/rtcp v1.2.10 // indirect
+	github.com/pion/rtp v1.7.13 // indirect
+	github.com/pion/sctp v1.8.7 // indirect
+	github.com/pion/sdp/v3 v3.0.6 // indirect
+	github.com/pion/srtp/v2 v2.0.15 // indirect
+	github.com/pion/stun v0.6.0 // indirect
+	github.com/pion/transport/v2 v2.2.1 // indirect
+	github.com/pion/turn/v2 v2.1.0 // indirect
+	github.com/pion/webrtc/v3 v3.2.9 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/polydawn/refmt v0.89.0 // indirect
 	github.com/prometheus/client_golang v1.17.0 // indirect
 	github.com/prometheus/client_model v0.5.0 // indirect
@@ -155,6 +173,7 @@ require (
 	github.com/raulk/go-watchdog v1.3.0 // indirect
 	github.com/samber/lo v1.36.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
+	github.com/stretchr/testify v1.8.4 // indirect
 	github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 // indirect
 	github.com/ucarion/urlpath v0.0.0-20200424170820-7ccc79b76bbb // indirect
 	github.com/whyrusleeping/base32 v0.0.0-20170828182744-c30ac30633cc // indirect

go.mod

@@ -185,6 +185,22 @@ require (
 	github.com/opencontainers/runtime-spec v1.1.0 // indirect
 	github.com/openzipkin/zipkin-go v0.4.1 // indirect
 	github.com/petar/GoLLRB v0.0.0-20210522233825-ae3b015fd3e9 // indirect
+	github.com/pion/datachannel v1.5.5 // indirect
+	github.com/pion/dtls/v2 v2.2.7 // indirect
+	github.com/pion/ice/v2 v2.3.6 // indirect
+	github.com/pion/interceptor v0.1.17 // indirect
+	github.com/pion/logging v0.2.2 // indirect
+	github.com/pion/mdns v0.0.7 // indirect
+	github.com/pion/randutil v0.1.0 // indirect
+	github.com/pion/rtcp v1.2.10 // indirect
+	github.com/pion/rtp v1.7.13 // indirect
+	github.com/pion/sctp v1.8.7 // indirect
+	github.com/pion/sdp/v3 v3.0.6 // indirect
+	github.com/pion/srtp/v2 v2.0.15 // indirect
+	github.com/pion/stun v0.6.0 // indirect
+	github.com/pion/transport/v2 v2.2.1 // indirect
+	github.com/pion/turn/v2 v2.1.0 // indirect
+	github.com/pion/webrtc/v3 v3.2.9 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/polydawn/refmt v0.89.0 // indirect
 	github.com/prometheus/client_model v0.5.0 // indirect