Where can I find the contentBytes of a document I have stored in a sharepoint site?

Question

I'm using graph API to auto-populate an email with attachments (Documents from SharePoint site) and need to know how I can access the contentBytes of these documents.

Thanks!

Answer 1

Hi @Trevor Westin ,
You can expand File Size to retrieve file size by following url

https://graph.microsoft.com/v1.0/sites/{site-id}/lists/{list-id}/items?expand=fields(select=FileLeafRef,File_x0020_Size)  

Here is the document for refer
https://learn.microsoft.com/en-us/graph/api/listitem-list?view=graph-rest-1.0&tabs=http

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Answer 2

If you stringify() the driveItem you can splice out the download url. Then using the code below you can make a blob file from the url where you can then grab the content bytes of that blob file.

  async function getBase64(fileDownloadUrl, onLoadCallback) {  
    let blob = await fetch(fileDownloadUrl).then(r => r.blob());  
    return new Promise(function (resolve, reject) {  
      var reader = new FileReader();  
      reader.onload = function () { resolve(reader.result); };  
      reader.onerror = function () { setEmailError(true) };  
      reader.readAsDataURL(blob);  
    });  
  }