feat(wasm): expose taildrive WebDAV server and listDrivePeers via JS bridge

Add drive.go (build tag !ts_omit_drive): implements drive.FileSystemForRemote with a JS-backed handler. Streams request bodies chunk-by-chunk via readBodyChunk() and response bodies via write()/end() callbacks so no full-body buffering occurs regardless of file size. The handler is nil-safe: returns 404 until setDriveHandler() is called from JS. Add drive_stub.go (build tag ts_omit_drive): no-op stubs for stripped builds. Add peer.go: extract buildPeerAPIURL helper (previously inline in run()). Modify wasm_js.go: call initDriveForRemote before NewLocalBackend (SubSystem is set-once), expose setDriveHandler and listDrivePeers via wireDriveJS, and refactor the inline peerAPI URL logic to use buildPeerAPIURL. listDrivePeers mirrors native driveRemotesFromPeers: returns empty if DriveAccessEnabled() is false, then filters peers by PeerCapabilityTaildriveSharer using lb.PeerCaps(addr).HasCapability() (the live ACL-derived cap map). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-09 20:57:01 +00:00
parent 0df765eb60
commit 7c5ecfe50f
4 changed files with 377 additions and 27 deletions
@@ -0,0 +1,41 @@
+// Copyright (c) Tailscale Inc & contributors
+// SPDX-License-Identifier: BSD-3-Clause
+
+package main
+
+import (
+	"fmt"
+	"net/netip"
+
+	"tailscale.com/tailcfg"
+)
+
+// buildPeerAPIURL returns the HTTP base URL for a peer's peerAPI server,
+// selecting IPv4 when available and falling back to IPv6. Returns an empty
+// string if the peer advertises no reachable peerAPI port.
+func buildPeerAPIURL(p tailcfg.NodeView, selfHave4, selfHave6 bool) string {
+	var pp4, pp6 uint16
+	for _, s := range p.Hostinfo().Services().All() {
+		switch s.Proto {
+		case tailcfg.PeerAPI4:
+			pp4 = s.Port
+		case tailcfg.PeerAPI6:
+			pp6 = s.Port
+		}
+	}
+	if selfHave4 && pp4 != 0 {
+		for _, a := range p.Addresses().All() {
+			if a.IsSingleIP() && a.Addr().Is4() {
+				return fmt.Sprintf("http://%v", netip.AddrPortFrom(a.Addr(), pp4))
+			}
+		}
+	}
+	if selfHave6 && pp6 != 0 {
+		for _, a := range p.Addresses().All() {
+			if a.IsSingleIP() && a.Addr().Is6() {
+				return fmt.Sprintf("http://%v", netip.AddrPortFrom(a.Addr(), pp6))
+			}
+		}
+	}
+	return ""
+}