Notion API で、databaseの "Done" がついてるかどうかを見て "Name" の頭に "■" をつけたり消したりする

code.gs

function doGet() {
  const notion_token = 'secret_...';
  const database_id = '...';
  const headers = {
    'Content-Type' : 'application/json; charset=UTF-8',
    'Authorization': `Bearer ${notion_token}`,
    'Notion-Version': '2021-05-13',
  };
  const fetched = UrlFetchApp.fetch(`https://api.notion.com/v1/databases/${database_id}/query`, {
    "method" : "post",
    "headers" : headers,
  });
  const json = JSON.parse(fetched.toString());
  for (x of json.results) {
    var id = x.id;
    var is_done = x.properties.Done.checkbox;
    var name = x.properties.Name.title[0].text.content;
    var name_without_square = name.match(/(■?)(.+)/)[2];
    var name2 = (is_done ? "■" : "") + name_without_square;
    if (name != name2) {
      UrlFetchApp.fetch(`https://api.notion.com/v1/pages/${id}`, {
        "method" : "patch",
        "headers" : headers,
        "payload" : JSON.stringify({
          'properties': {
            'Name': {
              'title': [{
                'text': { 'content': name2 }
              }]
            }
          }
        })
      });
    }
  }
}