Grant permissions for a given Azure Active Directory application registration

Summary

This script simplifies the process of granting FullControl or Manage permissions for an application registration in a SharePoint site collection, specifically when used in conjunction with the Azure Active Directory SharePoint application permission Sites.Selected.

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param(
    [Parameter(Mandatory)]
    [ValidateNotNullOrEmpty()]
    [string]$SiteUrl,

    [Parameter(Mandatory)]
    [ValidateNotNullOrEmpty()]
    [string]$AppId,

    [Parameter(Mandatory)]
    [ValidateSet('Read', 'Write', 'Manage', 'FullControl')]
    [string]$Permissions
)

Connect-PnPOnline -Url $SiteUrl -Interactive

$DisplayName = (Get-PnPAzureADApp -Identity $AppId).DisplayName
if ($Permissions -eq 'FullControl' -or $Permissions -eq 'Manage') {    
    Grant-PnPAzureADAppSitePermission -Permissions Write -Site $SiteUrl -AppId $AppId -DisplayName $DisplayName | Out-Null
    $PermissionId = Get-PnPAzureADAppSitePermission -AppIdentity $AppId
    Set-PnPAzureADAppSitePermission -Site $SiteUrl -PermissionId $(($PermissionId).Id) -Permissions $Permissions | Out-Null
    Get-PnPAzureADAppSitePermission -AppIdentity $AppId
}
else {
    Grant-PnPAzureADAppSitePermission -Permissions $Permissions -Site $SiteUrl -AppId $AppId -DisplayName $DisplayName
}

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Source Credit

Sample idea first appeared on https://www.leonarmston.com/2022/02/use-sites-selected-permission-with-fullcontrol-rather-than-write-or-read/. This is a slightly modified version.

Contributors

Author(s)
Michał Romiszewski

Disclaimer

THESE SAMPLES ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.