Get ContentId (or any FileAttachment properties) without ContentBytes with Outlook REST API

0
votes

In my application that uses the Outlook REST API, in order to support inlined images in html emails, I need to retrieve the ContentId of the File Attachments of a given email.

Note: in an html email inlined images are html tags of the form <input scr="cid:mycontentid">

I manage to get this information at url https://outlook.office.com/api/v2.0/me/messages/{message_id}/attachments

The problem is the returned json also contains the ContentBytes which can be arbitrary big for large attachments.

I tried several syntaxes to retrieve only the fields that I need such as:

https://outlook.office.com/api/v2.0/me/messages/{message_id}/attachments?$select=Id,ContentId or '$select=Id&$expand=ContentId'

none of them worked, resulting in a bad request 

{"error":{"code":"RequestBroker-ParseUri","message":"Could not find a property named 'ContentId' on type 'Microsoft.OutlookServices.Attachment'."}}

The expected types at url '/attachments' are Microsoft.OutlookServices.Attachment which is a base type for File Attachments and Item Attachment.

I would like to retrieve the specific member for File Attachments (ContentId) or to discard the heavy ContentBytes contained in the result.

1
office365apioutlook-restapioffice365-restapi

1 Answers

2
votes

The endpoint of me/messages/{message_id}/attachments return the collection of attachment.

The ContentId is the property of FileAttachment. You can use the code below to get the contentId of fileAttachment:

GET: https://outlook.office.com/api/v2.0/me/messages/{messageId}/attachments?$select=Microsoft.OutlookServices.FileAttachment/ContentId

EDIT: Remark: if you want to retrieve other field, say Name note that $select=Microsoft.OutlookServices.FileAttachment/ContentId,Name will work while that $select=Name,Microsoft.OutlookServices.FileAttachment/ContentId will throw the error mentioned in the original question