How to include image data in the HTML body using OneNote's REST API from Powershell?

Question

The OneNote API supports capturing images on to pages by including the image data in a POST. It requires a named <img> tag in the "Presentation" block of a multi-part request and binary image data in a part having the name from the <img> tag.

I cannot figure out how to embed the image data in the HTML body for the Invoke-RestMethod cmdlet such that the API renders the image on to the OneNote page. Who can help?

The closest I can get to an undistorted image is by following the "Content-type:image/jpeg" declaration by a blank line and by reading the image data UTF7-encoded from file.

$html = @"
--BlockBoundary
Content-Disposition:form-data; name="Presentation"
Content-type:text/html
<!DOCTYPE html>
  <html>
    <head><title>Page $Counter</title></head>
    <body><img src="name:TheImage"/></body>
  </html>
--BlockBoundary
Content-Disposition:form-data; name="TheImage"
Content-type:image/jpeg

$( Get-Content 'Image.jpg' -Raw -Encoding UTF7 )
--BlockBoundary--
"@

Invoke-RestMethod -Method Post `
    -Uri         'https://www.onenote.com/api/v1.0/pages' `
    -Headers     @{"Authorization" = "Bearer " + $AccessToken} `
    -ContentType 'multipart/form-data; boundary=BlockBoundary' `
    -Body        $html

The code snippet assumes Powershell 3.0 or higher, a valid access token being stored in the variable $AccessToken and an accessible image file.

Community · Accepted Answer · 2017-05-23 12:21:48Z

The main problem with the above snippet is that it was trying to save the image raw data within a string. Existing posts like How to send multipart/form-data with PowerShell Invoke-RestMethod talk about how to send multipart requests properly (The trick is to use the -InFile param in theInvoke-RestMethod cmdlet which reads the request body from a file).

Here's one way in which I was able to successfully generate a request:

# first build the request body prefix (everything before the image raw data)
$requestBodyPrefix = @"
--BlockBoundary
Content-Disposition:form-data; name="Presentation"
Content-type:text/html
<!DOCTYPE html>
  <html>
    <head><title>Page $Counter</title></head>
    <body><img src="name:TheImage"/></body>
  </html>
--BlockBoundary
Content-Disposition:form-data; name="TheImage"
Content-type:image/jpeg

"@
# save the prefix to a file 
Add-Content 'RequestBodySavedToFile' $requestBodyPrefix

#now read the image raw data and append to the file
$imageData = Get-Content 'Image.jpg' -Raw -Encoding Byte
Add-Content 'RequestBodySavedToFile' $imageData -Encoding Byte

# lastly, append the terminating boundary suffix
$requestBodySuffix = @"

--BlockBoundary--
"@
Add-Content 'RequestBodySavedToFile' $requestBodySuffix

#Invoke-RestMethod using the -InFile param
Invoke-RestMethod -Method Post `
    -Uri 'https://www.onenote.com/api/v1.0/pages' `
    -Headers @{"Authorization" = "Bearer " + $AccessToken} `
    -ContentType 'multipart/form-data; boundary=BlockBoundary' `
    -InFile 'RequestBodySavedToFile'

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