How to download attachments using Microsoft Graph API?

Question

I've able to get mailbox and attachment detail using Microsoft Graph API

Sample request

GET https://outlook.office.com/api/v2.0/me/messages/AAMkAGI2THVSAAA=/attachments?$select=Name

Sample response

Status code: 200

{
    "@odata.context": "https://outlook.office.com/api/v2.0/$metadata#Me/Messages('AAMkAGI2THVSAAA%3D')/Attachments(Name)",
    "value": [
        {
            "@odata.type": "#Microsoft.OutlookServices.FileAttachment",
            "@odata.id": "https://outlook.office.com/api/v2.0/Users('ddfcd489-628b-40d7-b48b-57002df800e5@1717622f-1d94-4d0c-9d74-709fad664b77')/Messages('AAMkAGI2THVSAAA=')/Attachments('AAMkAGI2j4kShdM=')",
            "Id": "AAMkAGI2j4kShdM=",
            "Name": "minutes.docx"
        }
    ]
}

I need a service for download attachments using Microsoft Graph API.

Answer 1

When using C#.NET:

await graphClient.Users["[email protected]"].MailFolders.Inbox.Messages.Request()
                .Expand("attachments").GetAsync();

or

await graphClient.Me.MailFolders.Inbox.Messages.Request()
                .Expand("attachments").GetAsync();

Regards

Answer 2

Yes, you can download the file locally from Microsoft Graph API. You need to convert the byte stream to base64 decoded data. Here is the code

$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => "https://graph.microsoft.com/v1.0/me/messages/your_message_id/attachments",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => array(
    "Prefer: IdType=\"ImmutableId\"",
    "Authorization: Bearer your_access_token"
  ),
));

$response = json_decode(curl_exec($curl),true);
curl_close($curl);

$fileName = $response['value'][0]['name'];
$contents = base64_decode($response['value'][0]['contentBytes']);

header("Content-type: ".$response['value'][0]['contentType']);
header("Content-Disposition: attachment; filename=" . $fileName);
print $contents;
die;