add --local auth

This introduces a new Authorizer, which is hookable per KlothoMain.
The default one just calls auth.Authorize(), but KlothoMains can provide
an alternative, including one that adds flags.

resolves #164

cmd/klotho/main.go

@@ -1,17 +1,35 @@
 package main
 
 import (
+	"github.com/klothoplatform/klotho/pkg/auth"
 	"github.com/klothoplatform/klotho/pkg/cli"
+	"github.com/spf13/pflag"
 )
 
 func main() {
+	authRequirement := LocalAuth(false)
 	km := cli.KlothoMain{
 		DefaultUpdateStream: "open:latest",
 		Version:             Version,
 		PluginSetup: func(psb *cli.PluginSetBuilder) error {
 			return psb.AddAll()
 		},
+		Authorizer: &authRequirement,
 	}
 
 	km.Main()
 }
+
+// LocalAuth is an auth.Authorizer that requires login unless its value is true.
+type LocalAuth bool
+
+func (local *LocalAuth) SetUpCliFlags(flags *pflag.FlagSet) {
+	flags.BoolVar((*bool)(local), "local", bool(*local), "If provided, runs Klotho with a local login (that is, not requiring an authenticated login)")
+}
+
+func (local *LocalAuth) Authorize() error {
+	if !*local {
+		return auth.Authorize()
+	}
+	return nil
+}

pkg/auth/auth.go

@@ -22,6 +22,23 @@ type LoginResponse struct {
 	State string
 }
 
+type Authorizer interface {
+	Authorize() error
+}
+
+func DefaultIfNil(auth Authorizer) Authorizer {
+	if auth == nil {
+		return standardAuthorizer{}
+	}
+	return auth
+}
+
+type standardAuthorizer struct{}
+
+func (s standardAuthorizer) Authorize() error {
+	return Authorize()
+}
+
 func Login() error {
 	state, err := CallLoginEndpoint()
 	if err != nil {
@@ -126,7 +143,11 @@ type MyCustomClaims struct {
 	jwt.StandardClaims
 }
 
-func Authorize(tokenRefreshed bool) error {
+func Authorize() error {
+	return authorize(false)
+}
+
+func authorize(tokenRefreshed bool) error {
 	creds, err := GetIDToken()
 	if err != nil {
 		return errors.New("failed to get credentials for user, please login")
@@ -147,7 +168,7 @@ func Authorize(tokenRefreshed bool) error {
 			if err != nil {
 				return err
 			}
-			err = Authorize(true)
+			err = authorize(true)
 			if err != nil {
 				return err
 			}
@@ -161,7 +182,7 @@ func Authorize(tokenRefreshed bool) error {
 			if err != nil {
 				return err
 			}
-			err = Authorize(true)
+			err = authorize(true)
 			if err != nil {
 				return err
 			}

pkg/cli/klothomain.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"fmt"
+	"github.com/spf13/pflag"
 	"os"
 	"regexp"
 
@@ -29,6 +30,12 @@ type KlothoMain struct {
 	Version             string
 	VersionQualifier    string
 	PluginSetup         func(*PluginSetBuilder) error
+	// Authorizer is an optional authorizer override. If this also conforms to FlagsProvider, those flags will be added.
+	Authorizer auth.Authorizer
+}
+
+type FlagsProvider interface {
+	SetUpCliFlags(flags *pflag.FlagSet)
 }
 
 var cfg struct {
@@ -71,6 +78,7 @@ const (
 )
 
 func (km KlothoMain) Main() {
+	km.Authorizer = auth.DefaultIfNil(km.Authorizer)
 
 	var root = &cobra.Command{
 		Use:  "klotho [path to source]",
@@ -94,8 +102,13 @@ func (km KlothoMain) Main() {
 	flags.BoolVar(&cfg.version, "version", false, "Print the version")
 	flags.BoolVar(&cfg.update, "update", false, "update the cli to the latest version")
 	flags.StringToStringVar(&cfg.setOption, "set-option", nil, "Sets a CLI option")
-	flags.BoolVar(&cfg.login, "login", false, "Login to Klotho with email. For anonymous login, use 'local'")
+	flags.BoolVar(&cfg.login, "login", false, "Login to Klotho with email.")
 	flags.BoolVar(&cfg.logout, "logout", false, "Logout of current klotho account.")
+
+	if authFlags, hasFlags := km.Authorizer.(FlagsProvider); hasFlags {
+		authFlags.SetUpCliFlags(flags)
+	}
+
 	_ = flags.MarkHidden("internalDebug")
 
 	err := root.Execute()
@@ -205,11 +218,6 @@ func (km KlothoMain) run(cmd *cobra.Command, args []string) (err error) {
 		return nil
 	}
 
-	err = auth.Authorize(false)
-	if err != nil {
-		return err
-
-	}
 	// Set up analytics
 	analyticsClient, err := analytics.NewClient(map[string]interface{}{
 		"version": km.Version,
@@ -253,6 +261,12 @@ func (km KlothoMain) run(cmd *cobra.Command, args []string) (err error) {
 		analyticsClient.Properties[km.VersionQualifier] = true
 	}
 
+	// Needs to go after the --version and --update checks
+	err = km.Authorizer.Authorize()
+	if err != nil {
+		return err
+	}
+
 	// if update is specified do the update in place
 	var klothoUpdater = updater.Updater{
 		ServerURL:     updater.DefaultServer,