feat: allow external services to be authable (#9996)

* feat: allow external services to be authable

* Refactor external auth config structure for defaults

* Add support for new config properties

* Change the name of external auth

* Move externalauth -> external-auth

* Run gen

* Fix tests

* Fix MW tests

* Fix git auth redirect

* Fix lint

* Fix name

* Allow any ID

* Fix invalid type test

* Fix e2e tests

* Fix comments

* Fix colors

* Allow accepting any type as string

* Run gen

* Fix href

cli/cliui/externalauth_test.go

@@ -0,0 +1,57 @@
+package cliui_test
+
+import (
+	"context"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coder/coder/v2/cli/clibase"
+	"github.com/coder/coder/v2/cli/cliui"
+	"github.com/coder/coder/v2/codersdk"
+	"github.com/coder/coder/v2/pty/ptytest"
+	"github.com/coder/coder/v2/testutil"
+)
+
+func TestExternalAuth(t *testing.T) {
+	t.Parallel()
+
+	ctx, cancel := context.WithTimeout(context.Background(), testutil.WaitShort)
+	defer cancel()
+
+	ptty := ptytest.New(t)
+	cmd := &clibase.Cmd{
+		Handler: func(inv *clibase.Invocation) error {
+			var fetched atomic.Bool
+			return cliui.ExternalAuth(inv.Context(), inv.Stdout, cliui.ExternalAuthOptions{
+				Fetch: func(ctx context.Context) ([]codersdk.TemplateVersionExternalAuth, error) {
+					defer fetched.Store(true)
+					return []codersdk.TemplateVersionExternalAuth{{
+						ID:              "github",
+						DisplayName:     "GitHub",
+						Type:            codersdk.EnhancedExternalAuthProviderGitHub.String(),
+						Authenticated:   fetched.Load(),
+						AuthenticateURL: "https://example.com/gitauth/github",
+					}}, nil
+				},
+				FetchInterval: time.Millisecond,
+			})
+		},
+	}
+
+	inv := cmd.Invoke().WithContext(ctx)
+
+	ptty.Attach(inv)
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		err := inv.Run()
+		assert.NoError(t, err)
+	}()
+	ptty.ExpectMatchContext(ctx, "You must authenticate with")
+	ptty.ExpectMatchContext(ctx, "https://example.com/gitauth/github")
+	ptty.ExpectMatchContext(ctx, "Successfully authenticated with GitHub")
+	<-done
+}