Get attachment in Bot Framework REST API

Question

Hello,

I'm developing a Teams bot that handle the attachments sent by the user in a conversation.

I don't use any Bot SDK, only REST calls to the Bot Framework REST API.

The documentation states that I can get attachment info and binary data by calling a specific endpoint URL.

GET /v3/attachments/{attachmentId}

The endpoint returns the following error when I call it with a valid token.

GET /v3/attachments/3e3c726a-95fd-4bcf-a817-eb9d0312e306

{"error":{"code":"BadArgument","message":"Invalid document content"}}

The ID is the one associated with the attachment in the activity I receive from Teams/Azure bot service.

What am I doing wrong ?

Thanks

Answer 1

I receive an Activity from Microsoft Teams.

The file ID I use to make the API call is the one in value.attachments[0].id

I know I have a downloadUrl in this activity but it's not always the case

{
    "name": "composeExtension/fetchTask",
    "type": "invoke",
    "timestamp": "2023-01-30T12:42:48.946Z",
    "localTimestamp": "2023-01-30T08:42:48.946-04:00",
    "id": "f:2985c764-36f3-6ec4-116f-152f196fafd4",
    "channelId": "msteams",
    "serviceUrl": "https://smba.trafficmanager.net/amer/",
    "from": {
        "id": "29:1JiEH1nLmzqH5YT7Do_1KRCs7ISDxUmVVKPbIzwM1pc884QpFbzi7GFznE58JZKe5sdjw65yzjAZtxyJt55B3mA",
        "name": "Benoit Dupont",
        "aadObjectId": "af24b8a2-cfe8-453a-a9b4-4a917b1534ae"
    },
    "conversation": {
        "conversationType": "personal",
        "tenantId": "caafef10-9d12-4668-a0d6-268b71695e1a",
        "id": "a:1ktMfOkUqtyhd4ub9GhZwaOdqpjjygWz5IZGvHZLTCnduBU1HmsFGO9vBAMZMQhqJOeiphjhE_k9G3HerhrBgeIf6uuA-FYRX93w_OsJYVTFX1lB36Q5xJgAGJtizZM1o"
    },
    "recipient": {
        "id": "28:45fc30f1-94c5-48aa-b0df-ef0e41b65c6c",
        "name": "XM Fax"
    },
    "entities": [
        {
            "locale": "en-CA",
            "country": "CA",
            "platform": "Web",
            "timezone": "America/Halifax",
            "type": "clientInfo"
        }
    ],
    "channelData": {
        "tenant": {
            "id": "caafef10-9d12-4668-a0d6-268b71695e1a"
        },
        "source": {
            "name": "compose"
        }
    },
    "value": {
        "commandId": "share-by-fax",
        "commandContext": "message",
        "requestId": "a3071327-d6c0-48b2-9523-1cf19f92b5e9",
        "messagePayload": {
            "linkToMessage": "https://teams.microsoft.com/l/message/19:af24b8a2-cfe8-453a-a9b4-4a917b1534ae_45fc30f1-94c5-48aa-b0df-ef0e41b65c6c@unq.gbl.spaces/1675081945447?context=%7B%22contextType%22:%22chat%22%7D",
            "id": "1675081945447",
            "replyToId": null,
            "createdDateTime": "2023-01-30T12:32:25.447Z",
            "lastModifiedDateTime": null,
            "deleted": false,
            "subject": null,
            "summary": null,
            "importance": "normal",
            "locale": "en-us",
            "body": {
                "contentType": "html",
                "content": "<attachment id=\"666296e5-4242-4f06-a050-ee38b449b76a\"></attachment>"
            },
            "from": {
                "device": null,
                "conversation": null,
                "user": {
                    "userIdentityType": "aadUser",
                    "id": "af24b8a2-cfe8-453a-a9b4-4a917b1534ae",
                    "displayName": "Benoit Dupont"
                },
                "application": null
            },
            "reactions": [],
            "mentions": [],
            "attachments": [
                {
                    "id": "666296e5-4242-4f06-a050-ee38b449b76a",
                    "contentType": "reference",
                    "contentUrl": "https://xxwdq-my.sharepoint.com/personal/adm_xxwdq_onmicrosoft_com/Documents/Microsoft Teams Chat Files/PDF (1).PDF",
                    "content": null,
                    "name": "PDF (1).PDF",
                    "thumbnailUrl": null
                }
            ]
        },
        "context": {
            "theme": "default"
        }
    },
    "locale": "en-CA",
    "localTimezone": "America/Halifax"
}