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Ensure the Site Assets Library is created

Author: Phillip Allan-Harding

There are occasions when creating a new modern SharePoint site using the CLI/REST API that the Site Assets library isn't created, use this script to ensure that the Site Assets library is created.

Reference: 'ensure' commands #1427

  • gets the collection of lists at the site url supplied
  • if a list with the title "Site Assets" isn't found
  • gets an access token for the tenant's SharePoint resource
  • calls the _api/web/Lists/EnsureSiteAssetsLibrary REST endpoint to create the Site Assets library
  • returns the existing or created SPList as a JSON object
function EnsureSiteAssetsLibrary {
  param (
    [Parameter(Mandatory)][string]$siteUrl
  )

  <#
    send a HTTP POST request to:
    https://<tenant>.sharepoint.com/sites/<sitename>/_api/web/Lists/EnsureSiteAssetsLibrary/
    which returns an SPList
  #>
  Write-Host "-> Ensure Site Assets library: $siteUrl"
  $list = m365 spo list get --webUrl $siteUrl --title "Site Assets" | ConvertFrom-Json
  
  if ($null -eq $list) {
    Write-Host "...Creating Site Assets library"

    try {
      $resource = ($siteUrl -split "/")[2]
      $accessToken = m365 util accesstoken get --resource "https://$resource" --output text
    }
    catch {
      throw "!! Unable to get AccessToken for EnsureSiteAssetsLibrary at '$siteUrl'`nERROR: $_"
    }
    try {
      $headers = @{ "Authorization" = "Bearer $accessToken"; "Accept" = "application/json;odata=nometadata" }
      $endpoint = "$siteUrl/_api/web/Lists/EnsureSiteAssetsLibrary/"
      $response = (Invoke-RestMethod -Uri $endpoint -Headers $headers -Method POST)
      $list = $response

      Write-Host "...Created: $($list.Id)"
    }
    catch {
      throw "!! Unable to EnsureSiteAssetsLibrary at '$siteUrl'`nERROR: $_"
    }
  } else {
    Write-Host "...Already exists: $($list.Id)"
  }

  $list
}
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