mmctl: add listing oauth apps (#25497)

* mmctl: add listing oauth apps

* Fix tests

* Update mmctl docs

* Fix tests

* Update server/cmd/mmctl/commands/oauth.go

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

* Update server/cmd/mmctl/commands/oauth.go

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

* Add paging

* Update docs

---------

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

server/cmd/mmctl/commands/oauth.go

@@ -0,0 +1,83 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package commands
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/mattermost/mattermost/server/public/model"
+
+	"github.com/mattermost/mattermost/server/v8/cmd/mmctl/client"
+	"github.com/mattermost/mattermost/server/v8/cmd/mmctl/printer"
+
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+var OAuthCmd = &cobra.Command{
+	Use:   "oauth",
+	Short: "Management of OAuth2 apps",
+}
+
+var ListOAuthAppsCmd = &cobra.Command{
+	Use:     "list",
+	Short:   "List OAuth2 apps",
+	Long:    "list all OAuth2 apps",
+	Example: "  oauth list",
+	RunE:    withClient(listOAuthAppsCmdF),
+	Args:    cobra.NoArgs,
+}
+
+func listOAuthAppsCmdF(c client.Client, command *cobra.Command, args []string) error {
+	page, err := command.Flags().GetInt("page")
+	if err != nil {
+		return err
+	}
+	perPage, err := command.Flags().GetInt("per-page")
+	if err != nil {
+		return err
+	}
+
+	apps, _, err := c.GetOAuthApps(context.Background(), page, perPage)
+	if err != nil {
+		return errors.Wrap(err, "Failed to fetch oauth2 apps")
+	}
+
+	userIds := make([]string, len(apps))
+	for i := range apps {
+		userIds[i] = apps[i].CreatorId
+	}
+
+	users, _, err := c.GetUsersByIds(context.Background(), userIds)
+	if err != nil {
+		return errors.Wrap(err, "Failed to fetch users for oauth2 apps")
+	}
+
+	usersByID := map[string]*model.User{}
+	for _, user := range users {
+		usersByID[user.Id] = user
+	}
+
+	for _, app := range apps {
+		ownerName := app.CreatorId
+		if owner, ok := usersByID[app.CreatorId]; ok {
+			ownerName = owner.Username
+		}
+		printer.PrintT(fmt.Sprintf("{{.Id}}: {{.Name}} (Created by %s)", ownerName), app)
+	}
+
+	return nil
+}
+
+func init() {
+	ListOAuthAppsCmd.Flags().Int("page", 0, "Page number to fetch for the list of OAuth2 apps")
+	ListOAuthAppsCmd.Flags().Int("per-page", 200, "Number of OAuth2 apps to be fetched")
+
+	OAuthCmd.AddCommand(
+		ListOAuthAppsCmd,
+	)
+
+	RootCmd.AddCommand(OAuthCmd)
+}