Office365 REST API - Creating a calendar event with attachments

Question

I am unable to create a calendar event with attachments using Office365's Rest API. Creating events without attachments is not a problem. Trying to create events with attachments creates the event, but the files I send are not added. The server responds with a 201 response code.

I am sending a POST request to:

https://graph.microsoft.com/v1.0/me/calendars/$(calendarID)/events

I use the following Authorization header:

Authorization: Bearer $(tokenString)

Request payload:

{
  "start": {
    "dateTime": "2017-09-27T20:00:00.000",
    "timeZone": "UTC"
  },
  "end": {
    "dateTime": "2017-09-27T21:00:00.000",
    "timeZone": "UTC"
  },
  "attendees": [
    {
      "emailAddress": {
        "address": "person@example.com"
      },
      "type": "Required"
    }
  ],
  "subject": "Example subject",
  "body": {
    "content": "Example content",
    "contentType": "Text"
  },
  "hasAttachments": true,
  "sensitivity": "Normal",
  "attachments": [
    {
      "@odata.type": "#microsoft.graph.fileAttachment",
      "name": "$(fileName)",
      "contentBytes": "$(base64EncodedString)"
    }
  ]
}

I'm following the documentation at https://developer.microsoft.com/en-us/graph/docs/api-reference/beta/api/calendar_post_events. My event follows the event schema, and the attachments follow the fileAttachment schema.

I have tried different values for @odata.type, removing hasAttachments from the request, as well as adding name, size, and contentType fields to the attachment. All of these give the same result - a 201 response, and an event created without attachments.

Any help would be much appreciated, thanks!

Jason Johnston Jason Johnston · Accepted Answer · 2017-09-27T17:18:25

I see this too! I'm able to post an attachment to the event after it's created, just not include one with the initial create payload.

So as a workaround, you can create the event, then do

POST /me/events/{eventid}/attachments

{
  "@odata.type": "#microsoft.graph.fileAttachment",
  "name": "$(fileName)",
  "contentBytes": "$(base64EncodedString)"
}

I'll check with the calendaring folks on this to see why it's not working during the initial POST.

Office365 REST API - Creating a calendar event with attachments

1 Answers