SPPermission

function FetchFilePermission(FileColl, callback) {
    $.each(FileColl, function (key, value) {
        var requestHeaders = { "accept": "application/json;odata=verbose" };
        $.ajax({
            url: value.MetadataURI + "/RoleAssignments/GetByPrincipalId(" + CurrentUserID + ")/RoleDefinitionBindings",
            contentType: "application/json;odata=verbose",
            headers: requestHeaders,
            async: false,
            success: function (data) {
                var FullControlTest = $.grep(data.d.results, function (element, index) { if (element.Id == 1073741829) { return element; } });
                if (FullControlTest.length > 0) {
                    FileColl[key].CurrentUserPermission = 'Full Control';
                }
                else {
                    FileColl[key].CurrentUserPermission = 'Edit';
                }
            },
            error: function (data) {
                FileColl[key].CurrentUserPermission = 'Read';
            }
        });
    });
                     return callback(FileColl);
}