PLT-7111 Add groupmsg command (#7419)

* Coping command_msg to use as command_groupmsg base

* Changing msg to groupmsg names in groumsg command

* Add groupmsg command

app/command_groupmsg.go

@@ -0,0 +1,137 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"fmt"
+	"strings"
+
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/mattermost-server/model"
+	goi18n "github.com/nicksnyder/go-i18n/i18n"
+)
+
+type groupmsgProvider struct {
+}
+
+const (
+	CMD_GROUPMSG = "groupmsg"
+)
+
+func init() {
+	RegisterCommandProvider(&groupmsgProvider{})
+}
+
+func (me *groupmsgProvider) GetTrigger() string {
+	return CMD_GROUPMSG
+}
+
+func (me *groupmsgProvider) GetCommand(T goi18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CMD_GROUPMSG,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_groupmsg.desc"),
+		AutoCompleteHint: T("api.command_groupmsg.hint"),
+		DisplayName:      T("api.command_groupmsg.name"),
+	}
+}
+
+func (me *groupmsgProvider) DoCommand(a *App, args *model.CommandArgs, message string) *model.CommandResponse {
+	targetUsers := map[string]*model.User{}
+	targetUsersSlice := []string{args.UserId}
+	invalidUsernames := []string{}
+
+	users, parsedMessage := groupMsgUsernames(message)
+
+	for _, username := range users {
+		username = strings.TrimSpace(username)
+		username = strings.TrimPrefix(username, "@")
+		if result := <-a.Srv.Store.User().GetByUsername(username); result.Err != nil {
+			invalidUsernames = append(invalidUsernames, username)
+		} else {
+			targetUser := result.Data.(*model.User)
+			_, exists := targetUsers[targetUser.Id]
+			if !exists && targetUser.Id != args.UserId {
+				targetUsers[targetUser.Id] = targetUser
+				targetUsersSlice = append(targetUsersSlice, targetUser.Id)
+			}
+		}
+	}
+
+	if len(invalidUsernames) > 0 {
+		invalidUsersString := map[string]interface{}{
+			"Users": "@" + strings.Join(invalidUsernames, ", @"),
+		}
+		return &model.CommandResponse{
+			Text:         args.T("api.command_groupmsg.invalid_user.app_error", len(invalidUsernames), invalidUsersString),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	if len(targetUsersSlice) == 2 {
+		return GetCommandProvider("msg").DoCommand(a, args, fmt.Sprintf("%s %s", targetUsers[targetUsersSlice[1]].Username, parsedMessage))
+	}
+
+	if len(targetUsersSlice) < model.CHANNEL_GROUP_MIN_USERS {
+		minUsers := map[string]interface{}{
+			"MinUsers": model.CHANNEL_GROUP_MIN_USERS - 1,
+		}
+		return &model.CommandResponse{
+			Text:         args.T("api.command_groupmsg.min_users.app_error", minUsers),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	if len(targetUsersSlice) > model.CHANNEL_GROUP_MAX_USERS {
+		maxUsers := map[string]interface{}{
+			"MaxUsers": model.CHANNEL_GROUP_MAX_USERS - 1,
+		}
+		return &model.CommandResponse{
+			Text:         args.T("api.command_groupmsg.max_users.app_error", maxUsers),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	groupChannel, channelErr := a.CreateGroupChannel(targetUsersSlice, args.UserId)
+	if channelErr != nil {
+		l4g.Error(channelErr.Error())
+		return &model.CommandResponse{Text: args.T("api.command_groupmsg.group_fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	if len(parsedMessage) > 0 {
+		post := &model.Post{}
+		post.Message = parsedMessage
+		post.ChannelId = groupChannel.Id
+		post.UserId = args.UserId
+		if _, err := a.CreatePostMissingChannel(post, true); err != nil {
+			return &model.CommandResponse{Text: args.T("api.command_groupmsg.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+		}
+	}
+
+	team, err := a.GetTeam(args.TeamId)
+	if err != nil {
+		return &model.CommandResponse{Text: args.T("api.command_groupmsg.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + groupChannel.Name, Text: "", ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+}
+
+func groupMsgUsernames(message string) ([]string, string) {
+	result := []string{}
+	resultMessage := ""
+	for idx, part := range strings.Split(message, ",") {
+		clean := strings.TrimPrefix(strings.TrimSpace(part), "@")
+		split := strings.Fields(clean)
+		if len(split) > 0 {
+			result = append(result, split[0])
+		}
+		if len(split) > 1 {
+			splitted := strings.SplitN(message, ",", idx+1)
+			resultMessage = strings.TrimPrefix(strings.TrimSpace(splitted[len(splitted)-1]), "@")
+			resultMessage = strings.TrimSpace(strings.TrimPrefix(resultMessage, split[0]))
+			break
+		}
+	}
+	return result, resultMessage
+}