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_msg.go

@@ -0,0 +1,115 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"errors"
+	"strings"
+
+	"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/channels/store"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/i18n"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+type msgProvider struct {
+}
+
+const (
+	CmdMsg = "msg"
+)
+
+func init() {
+	app.RegisterCommandProvider(&msgProvider{})
+}
+
+func (*msgProvider) GetTrigger() string {
+	return CmdMsg
+}
+
+func (*msgProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CmdMsg,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_msg.desc"),
+		AutoCompleteHint: T("api.command_msg.hint"),
+		DisplayName:      T("api.command_msg.name"),
+	}
+}
+
+func (*msgProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
+	splitMessage := strings.SplitN(message, " ", 2)
+
+	parsedMessage := ""
+	targetUsername := ""
+
+	if len(splitMessage) > 1 {
+		parsedMessage = strings.SplitN(message, " ", 2)[1]
+	}
+	targetUsername = strings.SplitN(message, " ", 2)[0]
+	targetUsername = strings.TrimPrefix(targetUsername, "@")
+
+	userProfile, nErr := a.Srv().Store().User().GetByUsername(targetUsername)
+	if nErr != nil {
+		mlog.Error(nErr.Error())
+		return &model.CommandResponse{Text: args.T("api.command_msg.missing.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	if userProfile.Id == args.UserId {
+		return &model.CommandResponse{Text: args.T("api.command_msg.missing.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	canSee, err := a.UserCanSeeOtherUser(args.UserId, userProfile.Id)
+	if err != nil {
+		mlog.Error(err.Error())
+		return &model.CommandResponse{Text: args.T("api.command_msg.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+	if !canSee {
+		return &model.CommandResponse{Text: args.T("api.command_msg.missing.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	// Find the channel based on this user
+	channelName := model.GetDMNameFromIds(args.UserId, userProfile.Id)
+
+	targetChannelId := ""
+	if channel, channelErr := a.Srv().Store().Channel().GetByName(args.TeamId, channelName, true); channelErr != nil {
+		var nfErr *store.ErrNotFound
+		if errors.As(channelErr, &nfErr) {
+			if !a.HasPermissionTo(args.UserId, model.PermissionCreateDirectChannel) {
+				return &model.CommandResponse{Text: args.T("api.command_msg.permission.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+			}
+
+			var directChannel *model.Channel
+			if directChannel, err = a.GetOrCreateDirectChannel(c, args.UserId, userProfile.Id); err != nil {
+				mlog.Error(err.Error())
+				return &model.CommandResponse{Text: args.T(err.Id), ResponseType: model.CommandResponseTypeEphemeral}
+			}
+			targetChannelId = directChannel.Id
+		} else {
+			mlog.Error(channelErr.Error())
+			return &model.CommandResponse{Text: args.T("api.command_msg.dm_fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+		}
+	} else {
+		targetChannelId = channel.Id
+	}
+
+	if parsedMessage != "" {
+		post := &model.Post{}
+		post.Message = parsedMessage
+		post.ChannelId = targetChannelId
+		post.UserId = args.UserId
+		if _, err = a.CreatePostMissingChannel(c, post, true, true); err != nil {
+			return &model.CommandResponse{Text: args.T("api.command_msg.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+		}
+	}
+
+	team, err := a.GetTeam(args.TeamId)
+	if err != nil {
+		return &model.CommandResponse{Text: args.T("api.command_msg.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + channelName, Text: "", ResponseType: model.CommandResponseTypeEphemeral}
+}