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

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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