Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/app/slashcommands/auto_teams.go

@@ -0,0 +1,80 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/utils"
+)
+
+type TeamEnvironment struct {
+	Users    []*model.User
+	Channels []*model.Channel
+}
+
+type AutoTeamCreator struct {
+	client        *model.Client4
+	Fuzzy         bool
+	NameLength    utils.Range
+	NameCharset   string
+	DomainLength  utils.Range
+	DomainCharset string
+	EmailLength   utils.Range
+	EmailCharset  string
+}
+
+func NewAutoTeamCreator(client *model.Client4) *AutoTeamCreator {
+	return &AutoTeamCreator{
+		client:        client,
+		Fuzzy:         false,
+		NameLength:    TeamNameLen,
+		NameCharset:   utils.LOWERCASE,
+		DomainLength:  TeamDomainNameLen,
+		DomainCharset: utils.LOWERCASE,
+		EmailLength:   TeamEmailLen,
+		EmailCharset:  utils.LOWERCASE,
+	}
+}
+
+func (cfg *AutoTeamCreator) createRandomTeam() (*model.Team, error) {
+	var teamEmail string
+	var teamDisplayName string
+	var teamName string
+	if cfg.Fuzzy {
+		teamEmail = "success+" + model.NewId() + "simulator.amazonses.com"
+		teamDisplayName = utils.FuzzName()
+		teamName = model.NewRandomTeamName()
+	} else {
+		teamEmail = "success+" + model.NewId() + "simulator.amazonses.com"
+		teamDisplayName = utils.RandomName(cfg.NameLength, cfg.NameCharset)
+		teamName = utils.RandomName(cfg.NameLength, cfg.NameCharset) + model.NewId()
+	}
+	team := &model.Team{
+		DisplayName: teamDisplayName,
+		Name:        teamName,
+		Email:       teamEmail,
+		Type:        model.TeamOpen,
+	}
+
+	createdTeam, _, err := cfg.client.CreateTeam(team)
+	if err != nil {
+		return nil, err
+	}
+	return createdTeam, nil
+}
+
+func (cfg *AutoTeamCreator) CreateTestTeams(num utils.Range) ([]*model.Team, error) {
+	numTeams := utils.RandIntFromRange(num)
+	teams := make([]*model.Team, numTeams)
+
+	for i := 0; i < numTeams; i++ {
+		var err error
+		teams[i], err = cfg.createRandomTeam()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return teams, nil
+}