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/boards/model/notification.go

@@ -0,0 +1,84 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"time"
+
+	"github.com/mattermost/mattermost-server/v6/server/channels/utils"
+)
+
+// NotificationHint provides a hint that a block has been modified and has subscribers that
+// should be notified.
+// swagger:model
+type NotificationHint struct {
+	// BlockType is the block type of the entity (e.g. board, card) that was updated
+	// required: true
+	BlockType BlockType `json:"block_type"`
+
+	// BlockID is id of the entity that was updated
+	// required: true
+	BlockID string `json:"block_id"`
+
+	// ModifiedByID is the id of the user who made the block change
+	ModifiedByID string `json:"modified_by_id"`
+
+	// CreatedAt is the timestamp this notification hint was created in miliseconds since the current epoch
+	// required: true
+	CreateAt int64 `json:"create_at"`
+
+	// NotifyAt is the timestamp this notification should be scheduled in miliseconds since the current epoch
+	// required: true
+	NotifyAt int64 `json:"notify_at"`
+}
+
+func (s *NotificationHint) IsValid() error {
+	if s == nil {
+		return ErrInvalidNotificationHint{"cannot be nil"}
+	}
+	if s.BlockID == "" {
+		return ErrInvalidNotificationHint{"missing block id"}
+	}
+	if s.BlockType == "" {
+		return ErrInvalidNotificationHint{"missing block type"}
+	}
+	if s.ModifiedByID == "" {
+		return ErrInvalidNotificationHint{"missing modified_by id"}
+	}
+	return nil
+}
+
+func (s *NotificationHint) Copy() *NotificationHint {
+	return &NotificationHint{
+		BlockType:    s.BlockType,
+		BlockID:      s.BlockID,
+		ModifiedByID: s.ModifiedByID,
+		CreateAt:     s.CreateAt,
+		NotifyAt:     s.NotifyAt,
+	}
+}
+
+func (s *NotificationHint) LogClone() interface{} {
+	return struct {
+		BlockType    BlockType `json:"block_type"`
+		BlockID      string    `json:"block_id"`
+		ModifiedByID string    `json:"modified_by_id"`
+		CreateAt     string    `json:"create_at"`
+		NotifyAt     string    `json:"notify_at"`
+	}{
+		BlockType:    s.BlockType,
+		BlockID:      s.BlockID,
+		ModifiedByID: s.ModifiedByID,
+		CreateAt:     utils.TimeFromMillis(s.CreateAt).Format(time.StampMilli),
+		NotifyAt:     utils.TimeFromMillis(s.NotifyAt).Format(time.StampMilli),
+	}
+}
+
+type ErrInvalidNotificationHint struct {
+	msg string
+}
+
+func (e ErrInvalidNotificationHint) Error() string {
+	return e.msg
+}