Add buf registry whoami command

CHANGELOG.md

@@ -2,7 +2,8 @@
 
 ## [Unreleased]
 
-- No changes yet.
+- Add `buf registry whoami` command, which checks if you are logged in to the Buf Schema
+  Registry at a given domain.
 
 ## [v1.45.0] - 2024-10-08
 

private/buf/bufprint/bufprint.go

@@ -248,6 +248,15 @@ func NewOrganizationEntity(organization *ownerv1.Organization, remote string) En
 	}
 }
 
+// NewUserEntity returns a new user entity to print.
+func NewUserEntity(user *registryv1alpha1.User) Entity {
+	return outputUser{
+		Username: user.Username,
+		// We use the Username as the full name for the user when printing.
+		FullName: user.Username,
+	}
+}
+
 // CuratedPluginPrinter is a printer for curated plugins.
 type CuratedPluginPrinter interface {
 	PrintCuratedPlugin(ctx context.Context, format Format, plugin *registryv1alpha1.CuratedPlugin) error
@@ -456,3 +465,12 @@ type outputOrganization struct {
 func (o outputOrganization) fullName() string {
 	return o.FullName
 }
+
+type outputUser struct {
+	Username string `json:"username,omitempty"`
+	FullName string `json:"-" bufprint:"Name"`
+}
+
+func (o outputUser) fullName() string {
+	return o.FullName
+}

private/buf/cmd/buf/buf.go

@@ -85,6 +85,7 @@ import (
 	"github.com/bufbuild/buf/private/buf/cmd/buf/command/registry/registrylogin"
 	"github.com/bufbuild/buf/private/buf/cmd/buf/command/registry/registrylogout"
 	"github.com/bufbuild/buf/private/buf/cmd/buf/command/registry/sdk/version"
+	"github.com/bufbuild/buf/private/buf/cmd/buf/command/registry/whoami"
 	"github.com/bufbuild/buf/private/bufpkg/bufcobra"
 	"github.com/bufbuild/buf/private/bufpkg/bufconnect"
 	"github.com/bufbuild/buf/private/bufpkg/bufmodule"
@@ -176,6 +177,7 @@ func NewRootCommand(name string) *appcmd.Command {
 				SubCommands: []*appcmd.Command{
 					registrylogin.NewCommand("login", builder),
 					registrylogout.NewCommand("logout", builder),
+					whoami.NewCommand("whoami", builder),
 					registrycc.NewCommand("cc", builder, ``, false),
 					{
 						Use:   "commit",

private/buf/cmd/buf/command/registry/registrylogin/registrylogin.go

@@ -34,6 +34,7 @@ import (
 	"github.com/bufbuild/buf/private/pkg/netext"
 	"github.com/bufbuild/buf/private/pkg/netrc"
 	"github.com/bufbuild/buf/private/pkg/oauth2"
+	"github.com/bufbuild/buf/private/pkg/syserror"
 	"github.com/bufbuild/buf/private/pkg/transport/http/httpclient"
 	"github.com/pkg/browser"
 	"github.com/spf13/pflag"
@@ -210,7 +211,7 @@ func inner(
 	}
 	user := resp.Msg.User
 	if user == nil {
-		return errors.New("no user found for provided token")
+		return syserror.New("no user found for registry login token")
 	}
 	if err := netrc.PutMachines(
 		container,

private/buf/cmd/buf/command/registry/whoami/whoami.go

@@ -0,0 +1,139 @@
+// Copyright 2020-2024 Buf Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package whoami
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"connectrpc.com/connect"
+	"github.com/bufbuild/buf/private/buf/bufcli"
+	"github.com/bufbuild/buf/private/buf/bufprint"
+	"github.com/bufbuild/buf/private/bufpkg/bufconnect"
+	"github.com/bufbuild/buf/private/gen/proto/connect/buf/alpha/registry/v1alpha1/registryv1alpha1connect"
+	registryv1alpha1 "github.com/bufbuild/buf/private/gen/proto/go/buf/alpha/registry/v1alpha1"
+	"github.com/bufbuild/buf/private/pkg/app/appcmd"
+	"github.com/bufbuild/buf/private/pkg/app/appext"
+	"github.com/bufbuild/buf/private/pkg/connectclient"
+	"github.com/bufbuild/buf/private/pkg/netext"
+	"github.com/spf13/pflag"
+)
+
+const (
+	formatFlagName = "format"
+
+	loginCommand = "buf registry login"
+)
+
+// NewCommand returns a new Command.
+func NewCommand(
+	name string,
+	builder appext.SubCommandBuilder,
+) *appcmd.Command {
+	flags := newFlags()
+	return &appcmd.Command{
+		Use:   name + " <domain>",
+		Short: `Check if you are logged in to the Buf Schema Registry`,
+		Long: `This command checks if you are currently logged into the Buf Schema Registry at the provided <domain>.
+The <domain> argument will default to buf.build if not specified.`,
+		Args: appcmd.MaximumNArgs(1),
+		Run: builder.NewRunFunc(
+			func(ctx context.Context, container appext.Container) error {
+				return run(ctx, container, flags)
+			},
+		),
+		BindFlags: flags.Bind,
+	}
+}
+
+type flags struct {
+	Format string
+}
+
+func newFlags() *flags {
+	return &flags{}
+}
+
+func (f *flags) Bind(flagSet *pflag.FlagSet) {
+	flagSet.StringVar(
+		&f.Format,
+		formatFlagName,
+		bufprint.FormatText.String(),
+		fmt.Sprintf(`The output format to use. Must be one of %s`, bufprint.AllFormatsString),
+	)
+}
+
+func run(
+	ctx context.Context,
+	container appext.Container,
+	flags *flags,
+) error {
+	remote := bufconnect.DefaultRemote
+	if container.NumArgs() == 1 {
+		remote = container.Arg(0)
+		if _, err := netext.ValidateHostname(remote); err != nil {
+			return err
+		}
+	}
+	clientConfig, err := bufcli.NewConnectClientConfig(container)
+	if err != nil {
+		return err
+	}
+	authnService := connectclient.Make(clientConfig, remote, registryv1alpha1connect.NewAuthnServiceClient)
+	currentUserResponse, err := authnService.GetCurrentUser(ctx, connect.NewRequest(&registryv1alpha1.GetCurrentUserRequest{}))
+	if err != nil {
+		if connectErr := new(connect.Error); errors.As(err, &connectErr) && connectErr.Code() == connect.CodeUnauthenticated {
+			return fmt.Errorf("Not currently logged in for %s.", remote)
+		}
+		return err
+	}
+	user := currentUserResponse.Msg.User
+	if user == nil {
+		return fmt.Errorf(
+			`No user is logged in to %s. Run %q to refresh your credentials. If you have the %s environment variable set, ensure that the token is valid.`,
+			remote,
+			loginCommandForRemote(remote),
+			bufconnect.TokenEnvKey,
+		)
+	}
+	format, err := bufprint.ParseFormat(flags.Format)
+	if err != nil {
+		return appcmd.WrapInvalidArgumentError(err)
+	}
+	// ParseFormat always expects a format that is either text or json, otherwise it returns
+	// an error, so do not need a default case for this switch.
+	switch format {
+	case bufprint.FormatText:
+		_, err = fmt.Fprintf(container.Stdout(), "Logged in as %s.\n", user.Username)
+		return err
+	case bufprint.FormatJSON:
+		return bufprint.PrintEntity(
+			container.Stdout(),
+			format,
+			bufprint.NewUserEntity(user),
+		)
+	}
+	return nil
+}
+
+// loginCommandForRemote returns the login command for the given remote,
+// the default remote is excluded in the command.
+func loginCommandForRemote(remote string) string {
+	if remote == bufconnect.DefaultRemote {
+		return loginCommand
+	}
+	return fmt.Sprintf("%s %s", loginCommand, remote)
+}