Bind build support, further Yggdrasil demo updates (#1152)

* Add gobind builds for Yggdrasil demo

* Massage client API a bit

* Fix build

* Fix gobind build

* Fix gobind client API setup

* Tweaks

* Tweaks

* Update sytest-whitelist, add comment

* Default to sending push rules on initial sync

cmd/dendrite-demo-yggdrasil/yggconn/client.go

@@ -0,0 +1,74 @@
+package yggconn
+
+import (
+	"context"
+	"crypto/ed25519"
+	"encoding/hex"
+	"fmt"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/convert"
+	"github.com/matrix-org/dendrite/internal/setup"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+func (n *Node) yggdialer(_, address string) (net.Conn, error) {
+	tokens := strings.Split(address, ":")
+	raw, err := hex.DecodeString(tokens[0])
+	if err != nil {
+		return nil, fmt.Errorf("hex.DecodeString: %w", err)
+	}
+	converted := convert.Ed25519PublicKeyToCurve25519(ed25519.PublicKey(raw))
+	convhex := hex.EncodeToString(converted)
+	return n.Dial("curve25519", convhex)
+}
+
+func (n *Node) yggdialerctx(ctx context.Context, network, address string) (net.Conn, error) {
+	return n.yggdialer(network, address)
+}
+
+type yggroundtripper struct {
+	inner *http.Transport
+}
+
+func (y *yggroundtripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	req.URL.Scheme = "http"
+	return y.inner.RoundTrip(req)
+}
+
+func (n *Node) CreateClient(
+	base *setup.BaseDendrite,
+) *gomatrixserverlib.Client {
+	tr := &http.Transport{}
+	tr.RegisterProtocol(
+		"matrix", &yggroundtripper{
+			inner: &http.Transport{
+				ResponseHeaderTimeout: 15 * time.Second,
+				IdleConnTimeout:       60 * time.Second,
+				DialContext:           n.yggdialerctx,
+			},
+		},
+	)
+	return gomatrixserverlib.NewClientWithTransport(tr)
+}
+
+func (n *Node) CreateFederationClient(
+	base *setup.BaseDendrite,
+) *gomatrixserverlib.FederationClient {
+	tr := &http.Transport{}
+	tr.RegisterProtocol(
+		"matrix", &yggroundtripper{
+			inner: &http.Transport{
+				ResponseHeaderTimeout: 15 * time.Second,
+				IdleConnTimeout:       60 * time.Second,
+				DialContext:           n.yggdialerctx,
+			},
+		},
+	)
+	return gomatrixserverlib.NewFederationClientWithTransport(
+		base.Cfg.Matrix.ServerName, base.Cfg.Matrix.KeyID, base.Cfg.Matrix.PrivateKey, tr,
+	)
+}