Add api command

cmd/sing-box/cmd_api_tailscale_peer_show.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"strings"
+	"time"
+
+	"github.com/sagernet/sing-box/daemon"
+	"github.com/sagernet/sing-box/dns"
+	F "github.com/sagernet/sing/common/format"
+
+	"github.com/spf13/cobra"
+)
+
+const commandAPITailscalePeerLabelWidth = len("SSH host keys") + 3
+
+var commandAPITailscalePeerShow = &cobra.Command{
+	Use:   "show <peer>",
+	Short: "Print Tailscale peer details",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return runAPITailscalePeerShow(args[0])
+	},
+}
+
+func init() {
+	commandAPITailscalePeer.AddCommand(commandAPITailscalePeerShow)
+}
+
+func runAPITailscalePeerShow(selector string) error {
+	clientConn, client, err := createAPIClient()
+	if err != nil {
+		return err
+	}
+	defer clientConn.Close()
+	endpoint, err := fetchTailscaleEndpoint(client)
+	if err != nil {
+		return err
+	}
+	entry, err := resolveTailscalePeer(tailscalePeerEntries(endpoint), selector)
+	if err != nil {
+		return err
+	}
+	peer := entry.peer
+	exitNode := "no"
+	if peer.GetExitNode() {
+		exitNode = "in use"
+	} else if peer.GetExitNodeOption() {
+		exitNode = "offered"
+	}
+	var block blockWriter
+	block.addLine("DNS name", dns.FqdnToDomain(peer.GetDnsName()))
+	block.addLine("Host name", peer.GetHostName())
+	block.addLine("Stable ID", peer.GetStableID())
+	block.addLine("User", formatTailscaleUser(entry.group))
+	block.addLine("OS", peer.GetOs())
+	block.addLine("IPs", strings.Join(peer.GetTailscaleIPs(), ", "))
+	block.addLine("Online", formatYesNo(peer.GetOnline()))
+	block.addLine("Active", formatYesNo(peer.GetActive()))
+	block.addLine("Expired", formatYesNo(peer.GetExpired()))
+	block.addLine("Sharee node", formatYesNo(peer.GetShareeNode()))
+	block.addLine("Exit node", exitNode)
+	block.addLine("Rx", F.ToString(peer.GetRxBytes()))
+	block.addLine("Tx", F.ToString(peer.GetTxBytes()))
+	block.addLine("Key expiry", formatTailscaleTime(peer.GetKeyExpiry()))
+	block.addLine("Last seen", formatTailscaleTime(peer.GetLastSeen()))
+	block.addLine("SSH host keys", formatTailscaleSSHHostKeys(peer.GetSshHostKeys()))
+	block.flush()
+	return nil
+}
+
+func formatTailscaleUser(group *daemon.TailscaleUserGroup) string {
+	loginName := group.GetLoginName()
+	displayName := group.GetDisplayName()
+	if displayName == "" || displayName == loginName {
+		return loginName
+	}
+	if loginName == "" {
+		return displayName
+	}
+	return F.ToString(loginName, " (", displayName, ")")
+}
+
+func formatTailscaleTime(timestamp int64) string {
+	if timestamp == 0 {
+		return ""
+	}
+	return time.Unix(timestamp, 0).Local().Format(time.RFC3339)
+}
+
+func formatTailscaleSSHHostKeys(hostKeys []string) string {
+	if len(hostKeys) == 0 {
+		return ""
+	}
+	var builder strings.Builder
+	builder.WriteString(F.ToString(len(hostKeys)))
+	for _, hostKey := range hostKeys {
+		builder.WriteString("\n")
+		builder.WriteString(strings.Repeat(" ", commandAPITailscalePeerLabelWidth))
+		builder.WriteString(hostKey)
+	}
+	return builder.String()
+}