Scaffold ipswap: tray-driven Windows IP preset switcher

Implements the design in claude.md as a building skeleton: pure Go, no cgo, cross-compiles to a single Windows .exe from Linux. Architecture follows the spec's deliberate split. The fast path is native — tray icon, grouped submenus, a Win32 MessageBox showing a live before/after diff, then netsh. The slow path is an embedded web editor served on a random loopback port and opened in the default browser. Two decisions worth recording: Reads use GetAdaptersAddresses, writes use netsh. The spec left the enumeration mechanism open; parsing `netsh show config` breaks on a non-English Windows because the output is localised. DNS static-vs-DHCP origin is not exposed by that API, so it comes from one registry read. The netsh command plan is built in portable code. That puts the delete-every- existing-address step — the one that stops secondary addresses leaking across switches — under test without needing a Windows box. The editor requires the session token in a header for mutations, not just the cookie: any page in the browser can make it POST to 127.0.0.1 with the cookie attached, but it cannot set a header. The updater refuses to install a release that publishes no SHA256. Not yet done: no group picker for export (the API supports it), no single-instance guard, and internal/server/web/app.css is reconstructed from the description in claude.md rather than the canonical apointless.css. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-20 13:29:35 +10:00
commit 23dcfb393f
46 changed files with 5782 additions and 0 deletions
@@ -0,0 +1,92 @@
+package netcfg
+
+import (
+	"fmt"
+	"strings"
+
+	"gitea.apointless.space/bsncubed/ipswap/internal/preset"
+)
+
+// ConfirmText renders the before/after body of the confirmation MessageBox.
+//
+// The live side must be read at prompt time rather than taken from the cached
+// active-preset poll: the prompt is the only safety net before a destructive
+// change, and a 30-second-stale "CURRENT" block would undermine it.
+func ConfirmText(p preset.Preset, live LiveConfig) string {
+	var b strings.Builder
+
+	fmt.Fprintf(&b, "Apply preset %q to adapter %q?\n\n", p.Name, p.Adapter)
+
+	b.WriteString("CURRENT\n")
+	writeLive(&b, live)
+
+	b.WriteString("\nNEW\n")
+	writePreset(&b, p)
+
+	return b.String()
+}
+
+func writeLive(b *strings.Builder, live LiveConfig) {
+	if len(live.Addresses) == 0 {
+		b.WriteString("  (no IPv4 address)\n")
+	}
+	for i, a := range live.Addresses {
+		suffix := ""
+		if live.DHCP {
+			suffix = " (DHCP)"
+		}
+		prefix := "  "
+		if i > 0 {
+			prefix = "  + "
+		}
+		fmt.Fprintf(b, "%s%s%s\n", prefix, a.String(), suffix)
+	}
+	if len(live.Gateways) > 0 {
+		fmt.Fprintf(b, "  Gateway: %s\n", strings.Join(live.Gateways, ", "))
+	}
+	if len(live.DNS) > 0 {
+		suffix := ""
+		if live.DNSFromDHCP {
+			suffix = " (DHCP)"
+		}
+		fmt.Fprintf(b, "  DNS: %s%s\n", strings.Join(live.DNS, ", "), suffix)
+	}
+}
+
+func writePreset(b *strings.Builder, p preset.Preset) {
+	if p.Mode == preset.ModeDHCP {
+		b.WriteString("  DHCP\n")
+	} else if p.Primary != nil {
+		fmt.Fprintf(b, "  %s\n", p.Primary.String())
+		for _, s := range p.Secondary {
+			fmt.Fprintf(b, "  + %s\n", s.String())
+		}
+		if p.Primary.Gateway != "" {
+			fmt.Fprintf(b, "  Gateway: %s\n", p.Primary.Gateway)
+		}
+	}
+
+	switch p.DNS.Mode {
+	case preset.ModeDHCP:
+		b.WriteString("  DNS: from DHCP\n")
+	default:
+		fmt.Fprintf(b, "  DNS: %s\n", strings.Join(p.DNS.Servers, ", "))
+	}
+}
+
+// Summary is the one-line description of a live config, used for the editor's
+// adapter picker.
+func (l LiveConfig) Summary() string {
+	if len(l.Addresses) == 0 {
+		return "no IPv4 address"
+	}
+	parts := make([]string, 0, len(l.Addresses))
+	for _, a := range l.Addresses {
+		parts = append(parts, a.String())
+	}
+	s := strings.Join(parts, ", ")
+	if l.DHCP {
+		s += " (DHCP)"
+	}
+	return s
+}