feat: Add subfolder browsing to Get-FolderBrowser function

SharePointFunctions.ps1

@@ -158,6 +158,9 @@ function Move-Files {
     }
 }
 function Get-FolderBrowser {
+    param (
+        [string]$ParentFolderUrl = ""
+    )
     try {
         # Get site ID first
         $siteUrl = $script:txtSiteUrl.Text.TrimEnd('/')
@@ -188,7 +191,28 @@ function Get-FolderBrowser {
         }
 
         # Get root folder first
-        $root = Get-MgDriveRoot -DriveId $drive.Id
+        # Get root folder first
+        if ($ParentFolderUrl) {
+            # Get the folder ID first
+            # Construct the correct URI for the folder
+            # Remove the /sites/tax/Shared Documents part from the folder path
+            $relativePath = $ParentFolderUrl.Replace("/sites/tax/Shared Documents/", "").TrimStart("/")
+            
+            # URL encode the relative path
+            $encodedPath = [System.Web.HttpUtility]::UrlEncode($relativePath)
+            
+            $folderUri = "https://graph.microsoft.com/v1.0/drives/$($drive.Id)/root:/$encodedPath"
+            $script:txtStatus.Text += "Folder URI: $folderUri`n"
+            try {
+                $folderItem = Invoke-MgGraphRequest -Method GET -Uri $folderUri -ErrorAction Stop
+            } catch {
+                throw "Folder not found: $($_.Exception.Message)"
+            }
+            $root = $folderItem
+        }
+        else {
+            $root = Get-MgDriveRoot -DriveId $drive.Id
+        }
         
         # Get folders using the root item's ID
         $folders = Get-MgDriveItemChild -DriveId $drive.Id -DriveItemId $root.Id | Where-Object { $_.Folder }
@@ -198,11 +222,33 @@ function Get-FolderBrowser {
             [PSCustomObject]@{
                 Name = $_.Name
                 ServerRelativeUrl = "/sites/tax/Shared Documents/$($_.Name)"
+                IsFolder = $true # Add a property to indicate it's a folder
             }
         }
 
-        return $folderObjects | 
-            Out-GridView -Title "Select Folder" -PassThru
+        # Add ".." entry to go up a level if not at the root
+        if ($ParentFolderUrl) {
+            $parentUrl = Split-Path -Path $ParentFolderUrl -Parent
+            $folderObjects = @([PSCustomObject]@{
+                Name = ".."
+                ServerRelativeUrl = $parentUrl
+                IsFolder = $true
+            }) + $folderObjects
+        }
+
+        # Show the Out-GridView
+        $selected = $folderObjects | Out-GridView -Title "Select Folder" -PassThru
+
+        # If a folder is selected, browse into it
+        if ($selected -and $selected.IsFolder -eq $true -and $selected.Name -ne "..") {
+            return Get-FolderBrowser -ParentFolderUrl $selected.ServerRelativeUrl
+        }
+        elseif ($selected -and $selected.Name -eq "..") {
+            return Get-FolderBrowser -ParentFolderUrl $selected.ServerRelativeUrl
+        }
+        else {
+            return $selected
+        }
     }
     catch {
         $script:txtStatus.Text += "Folder Error: $($_.Exception.Message)`n"