From c054e2766e78e4676055566a7b5fec3591a74295 Mon Sep 17 00:00:00 2001
From: Samuel Lock <samuel.lock@monarch-ares.io>
Date: Thu, 12 May 2022 20:18:52 +1000
Subject: [PATCH] added cli options to output ACLs

---
 acls_types.go             | 10 +++----
 app.go                    |  4 +++
 cmd/headscale/cli/acls.go | 60 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+), 5 deletions(-)
 create mode 100644 cmd/headscale/cli/acls.go

diff --git a/acls_types.go b/acls_types.go
index fb869821..cdfab720 100644
--- a/acls_types.go
+++ b/acls_types.go
@@ -11,11 +11,11 @@ import (
 
 // ACLPolicy represents a Tailscale ACL Policy.
 type ACLPolicy struct {
-	Groups    Groups    `json:"Groups"    yaml:"Groups"`
-	Hosts     Hosts     `json:"Hosts"     yaml:"Hosts"`
-	TagOwners TagOwners `json:"TagOwners" yaml:"TagOwners"`
-	ACLs      []ACL     `json:"ACLs"      yaml:"ACLs"`
-	Tests     []ACLTest `json:"Tests"     yaml:"Tests"`
+	Groups    Groups    `json:"Groups,omitempty"    yaml:"Groups,omitempty"`
+	Hosts     Hosts     `json:"Hosts,omitempty"     yaml:"Hosts,omitempty"`
+	TagOwners TagOwners `json:"TagOwners,omitempty" yaml:"TagOwners,omitempty"`
+	ACLs      []ACL     `json:"ACLs,omitempty"      yaml:"ACLs,omitempty"`
+	Tests     []ACLTest `json:"Tests,omitempty"     yaml:"Tests,omitempty"`
 }
 
 // ACL is a basic rule for the ACL Policy.
diff --git a/app.go b/app.go
index a96ab83a..a853d307 100644
--- a/app.go
+++ b/app.go
@@ -874,3 +874,7 @@ func readOrCreatePrivateKey(path string) (*key.MachinePrivate, error) {
 
 	return &machineKey, nil
 }
+
+func (h *Headscale) GetACLPolicy() (*ACLPolicy) {
+	return h.aclPolicy
+}
\ No newline at end of file
diff --git a/cmd/headscale/cli/acls.go b/cmd/headscale/cli/acls.go
new file mode 100644
index 00000000..ef814613
--- /dev/null
+++ b/cmd/headscale/cli/acls.go
@@ -0,0 +1,60 @@
+package cli
+
+import (
+	"fmt"
+	
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(aclsCmd)
+	aclsCmd.AddCommand(listAclsCmd)
+
+}
+
+var aclsCmd = &cobra.Command{
+	Use:     "acls",
+	Short:   "Manage Access Control Lists (ACLs)",
+	Aliases: []string{"access-lists","acl"},
+}
+
+var listAclsCmd = &cobra.Command{
+	Use:     "list",
+	Short:   "List ACLs",
+	Aliases: []string{"ls","show"},
+	Run:      func(cmd *cobra.Command, args []string) {
+		output, _ := cmd.Flags().GetString("output")
+		if output == `` {
+			output = `json`
+		}
+		h, err := getHeadscaleApp()
+		if err != nil {
+			ErrorOutput(
+				err,
+				fmt.Sprintf("Error getting headscale app: %s", err),
+				output,
+			)
+
+			return
+		}
+		policy := h.GetACLPolicy()
+		if policy == nil {
+			SuccessOutput(
+				``,
+				`No policy defined.`,
+				``,
+			)
+
+			return 
+		} 
+
+		SuccessOutput(
+			policy,
+			``,
+			output,
+		)
+
+		return
+	},
+
+}
\ No newline at end of file