Add Auto Responder handler (#8386)

WIP Out Of Office

Return error for status command if user status is OOO

Ignore notifications if Out Of Office

Disable AutoResponder if status is set to online

Add test for AutoResponder

DisableAutoResponse when manually setting status

Remove check on status slash command

return early if user does not exists in SendAutoResponse method

Add proper error handling

Add a newline after error handling

Revert back to err == nil in api4/status.go

Remove a.Go when using a.Publish

Add name consistency with the feature auto responder

Last changes for name consistency, also fix failing test with auto_responder

Fix names of functions in auto responder test

Add ExperimentalEnableAutomaticReplies flag

Auto Responder reply to a post

model/config.go

@@ -991,6 +991,7 @@ type TeamSettings struct {
 	MaxNotificationsPerChannel          *int64
 	EnableConfirmNotificationsToChannel *bool
 	TeammateNameDisplay                 *string
+	ExperimentalEnableAutomaticReplies  *bool
 	ExperimentalTownSquareIsReadOnly    *bool
 	ExperimentalPrimaryTeam             *string
 }
@@ -1085,6 +1086,10 @@ func (s *TeamSettings) SetDefaults() {
 		s.EnableConfirmNotificationsToChannel = NewBool(true)
 	}
 
+	if s.ExperimentalEnableAutomaticReplies == nil {
+		s.ExperimentalEnableAutomaticReplies = NewBool(false)
+	}
+
 	if s.ExperimentalTownSquareIsReadOnly == nil {
 		s.ExperimentalTownSquareIsReadOnly = NewBool(false)
 	}

model/post.go

@@ -25,6 +25,7 @@ const (
 	POST_LEAVE_CHANNEL          = "system_leave_channel"
 	POST_JOIN_TEAM              = "system_join_team"
 	POST_LEAVE_TEAM             = "system_leave_team"
+	POST_AUTO_RESPONDER         = "system_auto_responder"
 	POST_ADD_REMOVE             = "system_add_remove" // Deprecated, use POST_ADD_TO_CHANNEL or POST_REMOVE_FROM_CHANNEL instead
 	POST_ADD_TO_CHANNEL         = "system_add_to_channel"
 	POST_REMOVE_FROM_CHANNEL    = "system_remove_from_channel"
@@ -194,6 +195,7 @@ func (o *Post) IsValid(maxPostSize int) *AppError {
 	case
 		POST_DEFAULT,
 		POST_JOIN_LEAVE,
+		POST_AUTO_RESPONDER,
 		POST_ADD_REMOVE,
 		POST_JOIN_CHANNEL,
 		POST_LEAVE_CHANNEL,

model/status.go

@@ -9,6 +9,7 @@ import (
 )
 
 const (
+	STATUS_OUT_OF_OFFICE   = "ooo"
 	STATUS_OFFLINE         = "offline"
 	STATUS_AWAY            = "away"
 	STATUS_DND             = "dnd"