Graph send mail with attachment - powershell

Question

I'm trying to send a e-mail with attachment with powershell, as soon as I add in the attachment, I get a 400 Bad Request error, while it works find without attachment. Hope someone has a clue...
Part added:
"attachments": [
{
"#odata.type": "#microsoft.graph.fileAttachment",
"name": "attachment.txt",
"contentType": "text/plain",
"contentBytes": "SGVsbG8gV29ybGQh"
}
]
Full request:
$Subject = "Subject2"
$Message = "Message2"
$Recipient = "testemailaddress"
$SaveToSentItems = $false
$Request=#"
{
"Message": {
"Subject": $(Escape-StringToJson $Subject),
"Body": {
"ContentType": "HTML",
"Content": $(Escape-StringToJson $Message)
},
"ToRecipients": [
{
"EmailAddress": {
"Address": "$Recipient"
}
}
],
"attachments": [
{
"#odata.type": "#microsoft.graph.fileAttachment",
"name": "attachment.txt",
"contentType": "text/plain",
"contentBytes": "SGVsbG8gV29ybGQh"
}
]
},
"SaveToSentItems": "$(if($SaveToSentItems){"true"}else{"false"})"
}
"#
# Convert to UTF-8 bytes
$Request_bytes = [system.Text.Encoding]::UTF8.getBytes($Request)
$headers = #{
"Authorization" = "Bearer $($attributes.EXO)"
"Accept" = "text/*, multipart/mixed, application/xml, application/json; odata.metadata=none"
"Content-Type" = "application/json; charset=utf-8"
"X-AnchorMailbox" = (Read-AADIntAccesstoken $attributes.EXO).upn
"Prefer" = 'exchange.behavior="ActivityAccess"'
}
$url="https://outlook.office.com/api/v2.0/me/sendmail"
Invoke-RestMethod -UseBasicParsing -Uri $Url -Method Post -Headers $headers -Body $Request_bytes
Error:
Invoke-RestMethod : The remote server returned an error: (400) Bad Request.
At line:47 char:1
Invoke-RestMethod -UseBasicParsing -Uri $Url -Method Post -Headers $h ...
+ CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
+ FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand

Answer 1

I use this for send attachs in mails with ms graph in powershell
$attach = "C:\file.pdf"
$fileName = (Get-Item -Path $attach).Name
$base64string = [Convert]::ToBase64String([IO.File]::ReadAllBytes($attach))
$message = '{
"message": {
"subject": "subject",
"body": {
"contentType": "HTML",
"content": "'+$body+'"
},
"importance": "high",
"toRecipients": [
{
"emailAddress": {
"address": "'+$mail+'"
}
}
],
"attachments": [
{
"#odata.type": "#microsoft.graph.fileAttachment",
"name": "'+$fileName+'",
"contentType": "text/plain",
"contentBytes": "'+$base64string+'"
}
],
},
"saveToSentItems": "true"
}'
$URL = "https://graph.microsoft.com/v1.0/users/xxxxxxxxxxxxxxxxxxxx/sendMail"
Invoke-RestMethod -Method POST -Uri $URL -Headers $headers -Body $message
Convert to Base64 string before insert in the request.
I guess you have your own "body"!
Regards.