[MM-44489] Cloud limits: enforcing files (#20703)

* Update last accessible file time

* Filter fileInfos

* Set inaccessible header

* Fix lint issue

* Fix lint issue

* Fix i18n

* add nil check

* Fix merge conflicts

* Add helper functions to clear out inaccessible files content

* Remove content for inaccessible files

* Fix typo

* wip

* Remove InaccessibleContent field, instead use Archived

* Add store tests

* Add tests

* Add separate funcs to ignore cloud limits

* Use separate query for MySql

* Use GetReplicaX

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/sqlstore/file_info_store.go

@@ -753,3 +753,49 @@ func (fs SqlFileInfoStore) GetStorageUsage(allowFromCache, includeDeleted bool)
 	}
 	return size, nil
 }
+
+// GetUptoNSizeFileTime returns the CreateAt time of the last accessible file with a running-total size upto n bytes.
+func (fs *SqlFileInfoStore) GetUptoNSizeFileTime(n int64) (int64, error) {
+	if n <= 0 {
+		return 0, errors.New("n can't be less than 1")
+	}
+
+	var sizeSubQuery sq.SelectBuilder
+	// Separate query for MySql, as current min-version 5.x doesn't support window-functions
+	if fs.DriverName() == model.DatabaseDriverMysql {
+		sizeSubQuery = sq.
+			Select("(@runningSum := @runningSum + fi.Size) RunningTotal", "fi.CreateAt").
+			From("FileInfo fi").
+			Join("(SELECT @runningSum := 0) as tmp").
+			Where(sq.Eq{"fi.DeleteAt": 0}).
+			OrderBy("fi.CreateAt DESC, fi.Id")
+	} else {
+		sizeSubQuery = sq.
+			Select("SUM(fi.Size) OVER(ORDER BY CreateAt DESC, fi.Id) RunningTotal", "fi.CreateAt").
+			From("FileInfo fi").
+			Where(sq.Eq{"fi.DeleteAt": 0})
+	}
+
+	builder := fs.getQueryBuilder().
+		Select("fi2.CreateAt").
+		FromSelect(sizeSubQuery, "fi2").
+		Where(sq.LtOrEq{"fi2.RunningTotal": n}).
+		OrderBy("fi2.CreateAt").
+		Limit(1)
+
+	query, queryArgs, err := builder.ToSql()
+	if err != nil {
+		return 0, errors.Wrap(err, "GetUptoNSizeFileTime_tosql")
+	}
+
+	var createAt int64
+	if err := fs.GetReplicaX().Get(&createAt, query, queryArgs...); err != nil {
+		if err == sql.ErrNoRows {
+			return 0, store.NewErrNotFound("File", "none")
+		}
+
+		return 0, errors.Wrapf(err, "failed to get the File for size upto=%d", n)
+	}
+
+	return createAt, nil
+}