Rename OneNote Sections using Powershell

### AUTHENTICATION ###
# Application (client) ID, tenant Name and secret
$clientID = "<replace by your own clientID>"
$clientSecret = "<replace by your own clientSecret>"
$tenantName = "<replace by your own tenantname>.onmicrosoft.com"
$resource = "https://graph.microsoft.com/"

$ReqTokenBody = @{
    Grant_Type    = "client_credentials"
    Scope         = "https://graph.microsoft.com/.default"
    client_Id     = $clientID
    Client_Secret = $clientSecret
}

$TokenResponse = Invoke-RestMethod -Uri "https://login.microsoftonline.com/$TenantName/oauth2/v2.0/token" -Method POST -Body $ReqTokenBody

$headers = @{
'Content-Type'  = 'application/json'
'Authorization' = 'Bearer ' + $($TokenResponse.access_token)
}

### GROUPS ###
## Get All Groups with a team
$apiUrl = 'https://graph.microsoft.com/v1.0/Groups/'
$Data = Invoke-RestMethod -Headers @{Authorization = "Bearer $($Tokenresponse.access_token)"} -Uri $apiUrl -Method Get
$groups = ($Data | select-object Value).Value | Where-Object { $_.resourceProvisioningOptions -eq "Team" }

# Loop through each group to get channels
foreach ($group in $groups) {
    $groupId = $group.id
    $groupName = $group.displayName

    Write-Output "Processing Group: $groupName ($groupId)"

    # Get NotebookID of group
    $noteBookUri = "https://graph.microsoft.com/v1.0/groups/$groupId/onenote/notebooks"
    $noteBookResponse = Invoke-RestMethod -Headers $headers -Uri $noteBookUri -Method Get
    $notebookID = $noteBookResponse.value.id
    Write-Output "OneNoteID: $notebookID"

    # Get all channels for the current group
    $channelsUri = "https://graph.microsoft.com/v1.0/teams/$groupId/channels"
    $channelsResponse = Invoke-RestMethod -Headers $headers -Uri $channelsUri -Method Get
    $channels = $channelsResponse.value

     if ($channels -ne [string]::IsNullOrEmpty($notebookID)) {
        Write-Output "Channels for Group: $groupName"
        $channels | Format-Table displayName, id -AutoSize

        foreach ($channel in $channels) {
            $ChannelId = $channel.id

            Write-Output "Processing Channel: $($channel.displayName) ($ChannelId)"

            # Get all tabs for the current channel
            $tabsUri = "https://graph.microsoft.com/v1.0/teams/$groupId/channels/$ChannelId/tabs"
            $tabsResponse = Invoke-RestMethod -Headers $headers -Uri $tabsUri -Method Get

            # Find the OneNote tab
            $oneNoteTab = $tabsResponse.value | Where-Object { $_.displayName -eq "Notes" }

            if ($oneNoteTab) {
                Write-Output "Found OneNote Tab in Channel: $($channel.displayName)"
                $oneNoteTab | Format-Table displayName, id, webUrl -AutoSize

                # Extract the content URL
                $contentUrl = $oneNoteTab.configuration.contentUrl            

                # Define the regex pattern to extract sectionId
                $pattern = "sectionId=([a-f0-9\-]+)"

                # Perform the match
                if ($contentUrl -match $pattern) {
                    $sectionId = $matches[1]                
                
                # Get details of OneNote section related to the channel
                $sectionUri= "https://graph.microsoft.com/v1.0/groups/$groupId/onenote/notebooks/$notebookID/sections"
                $oneNoteSection = Invoke-RestMethod -Headers $headers -Uri $sectionUri -Method Get
                $sectionInfo = $oneNoteSection.value | Where-Object { $_.id -eq $sectionId }
                $sectionName = $sectionInfo.displayName                

                if ($channel.displayName -eq $sectionName) {
                    Write-Output "Channel display name and OneNote Section name are the same."
                } else {
                    Write-Output "Channel display name '$($channel.displayName)' and OneNote Section name '$($sectionName)' are not equal."              
                  
                    # Define the body for renaming the OneNote section
                    $body = @{
                        displayName = $channel.displayName
                    } | ConvertTo-Json

                    Write-Output "Rename OneNoteSection of $($notebookID) in: $($groupId) into $($channel.displayName)"                   
             
                    $renameNotebookUri = "https://graph.microsoft.com/v1.0/groups/$groupId/onenote/sections/$sectionId"
                    $renameNotebookResponse = Invoke-RestMethod -Method Patch -Uri $renameNotebookUri -Headers $headers -Body $body
                    Write-Output "OneNote section renamed successfully."
                }
                }
            } else {
                Write-Output "No OneNote Tab found in Channel: $($channel.displayName)"
            }
        }
    } else {
        Write-Output "No channels found for Group: $groupName"
    }
}