From 9de9bc23f895b653dc63d08a5e9a314aaf37acba Mon Sep 17 00:00:00 2001
From: Adrien Raffin-Caboisse <adrien.raffin@sekoia.fr>
Date: Fri, 15 Apr 2022 16:00:32 +0200
Subject: [PATCH] feat(cli): add tag subcommand to add and remove tags

---
 cmd/headscale/cli/tags.go | 208 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 208 insertions(+)
 create mode 100644 cmd/headscale/cli/tags.go

diff --git a/cmd/headscale/cli/tags.go b/cmd/headscale/cli/tags.go
new file mode 100644
index 00000000..c40b6397
--- /dev/null
+++ b/cmd/headscale/cli/tags.go
@@ -0,0 +1,208 @@
+package cli
+
+import (
+	"fmt"
+	"log"
+
+	v1 "github.com/juanfont/headscale/gen/go/headscale/v1"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(tagCmd)
+
+	addTagCmd.Flags().Uint64P("identifier", "i", 0, "Node identifier (ID)")
+	err := addTagCmd.MarkFlagRequired("identifier")
+	if err != nil {
+		log.Fatalf(err.Error())
+	}
+	addTagCmd.Flags().StringSliceP("tags", "t", []string{}, "List of tags to add to the node")
+	tagCmd.AddCommand(addTagCmd)
+
+	delTagCmd.Flags().Uint64P("identifier", "i", 0, "Node identifier (ID)")
+	err = delTagCmd.MarkFlagRequired("identifier")
+	if err != nil {
+		log.Fatalf(err.Error())
+	}
+	delTagCmd.Flags().StringSliceP("tags", "t", []string{}, "List of tags to remove from the node")
+	tagCmd.AddCommand(delTagCmd)
+}
+
+var tagCmd = &cobra.Command{
+	Use:     "tags",
+	Short:   "Manage the tags of Headscale",
+	Aliases: []string{"t", "tag"},
+}
+
+var addTagCmd = &cobra.Command{
+	Use:   "add",
+	Short: "Add tags to a node in your network",
+	Run: func(cmd *cobra.Command, args []string) {
+		output, _ := cmd.Flags().GetString("output")
+		ctx, client, conn, cancel := getHeadscaleCLIClient()
+		defer cancel()
+		defer conn.Close()
+
+		// retrieve flags from CLI
+		identifier, err := cmd.Flags().GetUint64("identifier")
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error converting ID to integer: %s", err),
+				output,
+			)
+
+			return
+		}
+		tagsToAdd, err := cmd.Flags().GetStringSlice("tags")
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error retrieving list of tags to add to machine", err),
+				output,
+			)
+
+			return
+		}
+
+		// retrieve machine informations
+		request := &v1.GetMachineRequest{
+			MachineId: identifier,
+		}
+		resp, err := client.GetMachine(ctx, request)
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error retrieving machine: %s", err),
+				output,
+			)
+		}
+
+		// update machine
+		mergedTags := resp.Machine.GetForcedTags()
+		for _, tag := range tagsToAdd {
+			if !containsString(mergedTags, tag) {
+				mergedTags = append(mergedTags, tag)
+			}
+		}
+
+		machine := resp.GetMachine()
+		machine.ForcedTags = mergedTags
+
+		updateReq := &v1.UpdateMachineRequest{
+			Machine: machine,
+		}
+
+		// send updated machine upstream
+		updateResponse, err := client.UpdateMachine(ctx, updateReq)
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error while updating machine: %s", err),
+				output,
+			)
+		}
+
+		if updateResponse != nil {
+			SuccessOutput(
+				updateResponse.GetMachine(),
+				"Machine updated",
+				output,
+			)
+		}
+
+	},
+}
+
+var delTagCmd = &cobra.Command{
+	Use:     "del",
+	Short:   "remove tags to a node in your network",
+	Aliases: []string{"remove", "rm"},
+	Run: func(cmd *cobra.Command, args []string) {
+		output, _ := cmd.Flags().GetString("output")
+		ctx, client, conn, cancel := getHeadscaleCLIClient()
+		defer cancel()
+		defer conn.Close()
+
+		// retrieve flags from CLI
+		identifier, err := cmd.Flags().GetUint64("identifier")
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error converting ID to integer: %s", err),
+				output,
+			)
+
+			return
+		}
+		tagsToRemove, err := cmd.Flags().GetStringSlice("tags")
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error retrieving list of tags to add to machine", err),
+				output,
+			)
+
+			return
+		}
+
+		// retrieve machine informations
+		request := &v1.GetMachineRequest{
+			MachineId: identifier,
+		}
+		resp, err := client.GetMachine(ctx, request)
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error retrieving machine: %s", err),
+				output,
+			)
+		}
+
+		// update machine
+		keepTags := resp.Machine.GetForcedTags()
+		for _, tag := range tagsToRemove {
+			for i, t := range keepTags {
+				if t == tag {
+					keepTags = append(keepTags[:i], keepTags[i+1:]...)
+				}
+			}
+		}
+
+		machine := resp.GetMachine()
+		machine.ForcedTags = keepTags
+
+		updateReq := &v1.UpdateMachineRequest{
+			Machine: machine,
+		}
+
+		// send updated machine upstream
+		updateResponse, err := client.UpdateMachine(ctx, updateReq)
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error while updating machine: %s", err),
+				output,
+			)
+		}
+
+		if updateResponse != nil {
+			SuccessOutput(
+				updateResponse.GetMachine(),
+				"Machine updated",
+				output,
+			)
+		}
+
+	},
+}
+
+func containsString(ss []string, s string) bool {
+	for _, v := range ss {
+		if v == s {
+			return true
+		}
+	}
+
+	return false
+}