tailcfg: add UserProfile.Groups

Updates tailscale/corp#13375

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

tailcfg/tailcfg.go

@@ -3,7 +3,7 @@
 
 package tailcfg
 
-//go:generate go run tailscale.com/cmd/viewer --type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPHomeParams,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan,Location --clonefunc
+//go:generate go run tailscale.com/cmd/viewer --type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPHomeParams,DERPRegion,DERPMap,DERPNode,SSHRule,SSHAction,SSHPrincipal,ControlDialPlan,Location,UserProfile --clonefunc
 
 import (
 	"bytes"
@@ -102,7 +102,8 @@ type CapabilityVersion int
 //   - 63: 2023-06-08: Client understands SSHAction.AllowRemotePortForwarding.
 //   - 64: 2023-07-11: Client understands s/CapabilityTailnetLockAlpha/CapabilityTailnetLock
 //   - 65: 2023-07-12: Client understands DERPMap.HomeParams + incremental DERPMap updates with params
-const CurrentCapabilityVersion CapabilityVersion = 65
+//   - 66: 2023-07-23: UserProfile.Groups added (available via WhoIs)
+const CurrentCapabilityVersion CapabilityVersion = 66
 
 type StableID string
 
@@ -175,6 +176,27 @@ type UserProfile struct {
 	// Roles exists for legacy reasons, to keep old macOS clients
 	// happy. It JSON marshals as [].
 	Roles emptyStructJSONSlice
+
+	// Groups contains group identifiers for any group that this user is
+	// a part of and that the coordination server is configured to tell
+	// your node about. (Thus, it may be empty or incomplete.)
+	// There's no semantic difference between a nil and an empty list.
+	// The list is always sorted.
+	Groups []string `json:",omitempty"`
+}
+
+func (p *UserProfile) Equal(p2 *UserProfile) bool {
+	if p == nil && p2 == nil {
+		return true
+	}
+	if p == nil || p2 == nil {
+		return false
+	}
+	return p.ID == p2.ID &&
+		p.LoginName == p2.LoginName &&
+		p.DisplayName == p2.DisplayName &&
+		p.ProfilePicURL == p2.ProfilePicURL &&
+		(len(p.Groups) == 0 && len(p2.Groups) == 0 || reflect.DeepEqual(p.Groups, p2.Groups))
 }
 
 type emptyStructJSONSlice struct{}