Teams: Invoke-Webrequest sending base64 string (png) to Teams

问题

I am trying to send a base64-string which is a png to our Teams-channel which have an "Incoming Webhook" setup.

The message is sent to the channel but no image is displayed and when I searched for this it seems that I can't send an image or any other type of attachment as a base64-string to Teams?

Extremely new to json and consuming / using rest api in general.

I have no idea how to instruct the body that the string is a base64-string and the expected output should be a png-file.

Tried this:

$webhook = 'URLtoTeamsWebhook'
$base64 = "longBase64string"

$Body = @{
     "text" = "Hello World! from PowerShell"
     "imageData" = "$base64"
}

$params = @{
      Headers = @{'accept'='application/json'}
      Body = $Body | convertto-json
      Method = 'Post'
      URI = $webhook 
}

Invoke-RestMethod @params

But it didn't work, also tried the code below with changes to the body:

$Body = @{
  "type" = "string",
  "contentEncoding" = "$base64",
  "contentMediaType" = "image/png"
}

and it also didn't work.

"Didn't work" = Posting to Teams but not displaying the image at all.

Update:

Was able to figure this out, sort-of but would still appreciate a reply;

https://docs.microsoft.com/en-us/microsoftteams/platform/concepts/cards/cards-reference

I guess you can "only" use their cards to send in data through their "Incoming webhook" and the card I would like to use is the "Hero Card" since the data is an alarm with a image of a graph, HOWEVER it is not supported when using a "connector" :(

I found this website;

https://github.com/grafana/grafana/issues/13121

and I've used the example there however that require me to have to send the picture (which is in a base64-format) to S3 in order for users to be able to view a larger picture.

回答1:

Webhook support Office 365 connector card. Please send following message card JSON and let us know if you facing any issues.

 {
    "@type": "MessageCard",
    "text": "Here are test images",
    "sections": [
        {
            "images": [
                {
                    "image": "data:image/png;base64,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"
                }
            ]
        }
    ]
}

来源：https://stackoverflow.com/questions/56853198/teams-invoke-webrequest-sending-base64-string-png-to-teams

标签

powershell

microsoft-teams