Teams Bot Framework get file attachments ?

Question

Hello,

I'm trying to build a Teams app to get file in a chat (compose box or message action) and send it to a webservice.

How can the bot read the file content ?

I can get the file contentUrl with the following code

const url = context.activity.value.messagePayload.attachments[0].contentUrl  
const response = await axios.get(url, { responseType: 'arraybuffer' });  

When I try to access it inside the bot with axios I have a HTTP 403 forbidden error.

This documentation states that I can have access to the file content when it's a personal file "The user can directly read from this URL to fetch its binary content."
https://learn.microsoft.com/en-us/microsoftteams/platform/bots/how-to/bots-filesv4#code-sample

There should be another solution by using the Microsoft Graph.
I don't understand how ?
I have the attachment ID but how do I pass it to the Microsoft Graph to read it's content ?

Thanks

Answer 1

I found out another way to do it.

https://graph.microsoft.com/v1.0/users/{from.aadObjectId}/drive/root:/{ATTACHMENTS.CONTENTURL.afterDocumentsPath}  

With this, I have the reference to the object and a "@microsoft.graph.downloadUrl" link to use with axios and download its content.

      const att = await graphClient.api("/users/a841a46f-80f6-41cd-8717-7e41d6817192/drive/root:/Microsoft%20Teams%20Chat%20Files/PDF.PDF").get();  
      const response = await axios.get(att["@microsoft.graph.downloadUrl"], { responseType: 'arraybuffer'});  
  
      const buffer64 = Buffer.from(response.data, 'binary').toString('base64');  

Answer 2

Hey @Benoit Dupont

If you are looking a way to get attachment content you can use this https://graph.microsoft.com/v1.0/me/messages/{message-id}/attachments/{attachment-id}/$value Graph API endpoint. This will allow you to Get the raw contents of attachment. Please refer to this documentation for more details also please make sure you have right permissions before using this Graph API. Please refer to the below sample screenshot from Graph Explorer.

Also if you want to get the Code Snippets for this Graph API using Graph explorer.

Hope this helps.

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Answer 3

You can get the message ID using below API:

GET /me/messages  
GET /users/{id | userPrincipalName}/messages  

You can get the attachment ID using below API's:

GET /groups/{id}/threads/{id}/posts/{id}/attachments  
GET /groups/{id}/conversations/{id}/threads/{id}/posts/{id}/attachments  

Ref Doc:
https://learn.microsoft.com/en-us/graph/api/user-list-messages?view=graph-rest-1.0&tabs=http
https://learn.microsoft.com/en-us/graph/api/post-list-attachments?view=graph-rest-1.0&tabs=http

Thanks,
Nivedipa

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