[POC] Notion Database to Calendar (.ics)

code.gs

// Constant variables
const notionToken = "XXXXX";
const safeToken = "XXXXX";

function doGet(e) {
  const ics = HtmlService.createTemplateFromFile('ics');

  if (e.parameter.token != safeToken) {
    return ContentService.createTextOutput("Access Denied!");
  }

  ics.events = getQuickNote();
  
  return ContentService.createTextOutput(ics.evaluate().getContent()).setMimeType(ContentService.MimeType.ICAL);
}

function debug() {
  const ics = HtmlService.createTemplateFromFile('ics');
  ics.events = getQuickNote();
  Logger.log(ics.evaluate().getContent());
}

function getQuickNote() {
  // YOUR FILTER Condition:
  const payload = {
    "filter": {
      "and": [
        {
          "property": "Date",
            "date": {
            "is_not_empty": true
          }
        }
        ,
        {
          "property": "Name",
            "title": {
            "is_not_empty": true
          }
        }
      ]
    }
  };
  const result = getDatabase(YOUR_DATABASE_ID, payload);
  var events = [];
  for (const index in result.results) {
    const item = result.results[index]
    const properties = item.properties;

    const id = item['id'];
    const create = toICSDate(item["created_time"]);
    const edit = toICSDate(item["last_edited_time"]);
    const startDate = properties['Date']['date']['start'];
    const start = toICSDate(startDate);
    var endDate = properties['Date']?.['date']?.['end'];
    if (endDate == null) {
      endDate = startDate;
    }
    const end = toICSDate(endDate);
    const type = properties['Type']?.['multi_select']?.[0]?.['name'];

    const title = "["+type+"] "+properties?.['Name']?.['title']?.[0]?.['plain_text'];
    const description = item['url'];
    
    events.push(
      {
        "id":id,
        "create":create,
        "edit":edit,
        "start":start,
        "end":end,
        "title":title,
        "description":description
      }
    )
  }
  return events;
}
// TO UTC Date
function toICSDate(date) {
  const icsDate = new Date(date);
  icsDate.setHours(icsDate.getHours() - 8);
  return Utilities.formatDate(icsDate, "GMT+8", "yyyyMMdd'T'HHmmss'Z'");// 20240304T132300Z
}

// Notion
function getDatabase(id, payload) {
  const url = 'https://api.notion.com/v1/databases/'+id+'/query/';
  const options = {
    method: 'post',
    headers: {
      'Authorization': 'Bearer '+notionToken,
      'Content-Type': 'application/json',
      'Notion-Version': '2022-06-28'
    },
    payload: JSON.stringify(payload)
  }; 
  const result = UrlFetchApp.fetch(url, options);
  return JSON.parse(result.getContentText());
}

ics.html

BEGIN:VCALENDAR
PRODID:-//Google Inc//Google Calendar 70.9054//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:NotionCalendar
X-WR-TIMEZONE:Asia/Taipei
BEGIN:VTIMEZONE
TZID:Asia/Taipei
X-LIC-LOCATION:Asia/Taipei
BEGIN:STANDARD
TZOFFSETFROM:+0800
TZOFFSETTO:+0800
TZNAME:CST
DTSTART:19700101T000000
END:STANDARD
END:VTIMEZONE
<?
  for(const eventIndex in events) {
    const event = events[eventIndex];
    ?>
BEGIN:VEVENT
DTSTART:<?=event["start"]?>

DTEND:<?=event["end"]?>

DTSTAMP:<?=event["edit"]?>

UID:<?=event["id"]?>

CREATED:<?=event["create"]?>

LAST-MODIFIED:<?=event["edit"]?>

SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:<?=event["title"]?>

DESCRIPTION:<?=event["description"]?>

TRANSP:OPAQUE
END:VEVENT
<?
  }
?>
END:VCALENDAR

p.s. 純 POC，程式碼邏輯、架構無暇優化，請單純參考此實現可能性