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/command_channel_purpose.go

@@ -0,0 +1,97 @@
+// 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/app"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app/request"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/i18n"
+)
+
+type PurposeProvider struct {
+}
+
+const (
+	CmdPurpose = "purpose"
+)
+
+func init() {
+	app.RegisterCommandProvider(&PurposeProvider{})
+}
+
+func (*PurposeProvider) GetTrigger() string {
+	return CmdPurpose
+}
+
+func (*PurposeProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CmdPurpose,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_channel_purpose.desc"),
+		AutoCompleteHint: T("api.command_channel_purpose.hint"),
+		DisplayName:      T("api.command_channel_purpose.name"),
+	}
+}
+
+func (*PurposeProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
+	channel, err := a.GetChannel(c, args.ChannelId)
+	if err != nil {
+		return &model.CommandResponse{
+			Text:         args.T("api.command_channel_purpose.channel.app_error"),
+			ResponseType: model.CommandResponseTypeEphemeral,
+		}
+	}
+
+	switch channel.Type {
+	case model.ChannelTypeOpen:
+		if !a.HasPermissionToChannel(c, args.UserId, args.ChannelId, model.PermissionManagePublicChannelProperties) {
+			return &model.CommandResponse{
+				Text:         args.T("api.command_channel_purpose.permission.app_error"),
+				ResponseType: model.CommandResponseTypeEphemeral,
+			}
+		}
+	case model.ChannelTypePrivate:
+		if !a.HasPermissionToChannel(c, args.UserId, args.ChannelId, model.PermissionManagePrivateChannelProperties) {
+			return &model.CommandResponse{
+				Text:         args.T("api.command_channel_purpose.permission.app_error"),
+				ResponseType: model.CommandResponseTypeEphemeral,
+			}
+		}
+	default:
+		return &model.CommandResponse{
+			Text:         args.T("api.command_channel_purpose.direct_group.app_error"),
+			ResponseType: model.CommandResponseTypeEphemeral,
+		}
+	}
+
+	if message == "" {
+		return &model.CommandResponse{
+			Text:         args.T("api.command_channel_purpose.message.app_error"),
+			ResponseType: model.CommandResponseTypeEphemeral,
+		}
+	}
+
+	patch := &model.ChannelPatch{
+		Purpose: new(string),
+	}
+	*patch.Purpose = message
+
+	_, err = a.PatchChannel(c, channel, patch, args.UserId)
+	if err != nil {
+		text := args.T("api.command_channel_purpose.update_channel.app_error")
+		if err.Id == "model.channel.is_valid.purpose.app_error" {
+			text = args.T("api.command_channel_purpose.update_channel.max_length", map[string]any{
+				"MaxLength": model.ChannelPurposeMaxRunes,
+			})
+		}
+
+		return &model.CommandResponse{
+			Text:         text,
+			ResponseType: model.CommandResponseTypeEphemeral,
+		}
+	}
+
+	return &model.CommandResponse{}
+}