(PowerShell) List Files and Folders in a SharePoint Documents Library

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This example shows how to use Chilkat's HttpCurl class to list the files and folders in the root of a SharePoint Documents document library. In Microsoft Graph, a SharePoint document library is represented as a drive. The example demonstrates how HttpCurl automatically resolves the SharePoint site name to a site ID, finds the drive ID for the Documents library, and then retrieves the children of the library's root folder.

Note: This example requires Chilkat v11.0.0 or greater.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# This example lists the files and folders in the root of the SharePoint
# Documents document library.
# 
# In Microsoft Graph terminology, a SharePoint document library is represented
# as a "drive".  The default document library is commonly named "Documents".
# This example shows how HttpCurl can automatically resolve the needed values:
# 
#   site_name  ->  site_id
#   site_id    ->  document_library_id
# 
# After those values are known, the final request lists the children of the
# root folder in the Documents document library.

$success = $false

# --------------------------------------------------------------------------------------------------------
# Before running this example, create an Azure App Registration and grant it
# the Microsoft Graph permissions required to access SharePoint.
# 
# The application will authenticate using OAuth2 Client Credentials.
# See:
# How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
# --------------------------------------------------------------------------------------------------------

# Build a JSON authentication configuration.
# HttpCurl will use this information to automatically obtain OAuth2 access tokens.
$jsonAuth = New-Object Chilkat.JsonObject

# Enable secret lookup.
# 
# Instead of hard-coding sensitive values such as the client ID,
# client secret, and token endpoint, secret specification strings
# are used.  Chilkat automatically retrieves the actual values from
# Windows Credential Manager (Windows) or Apple Keychain (macOS).
# 
# See:
# Secret Specification Strings
$jsonAuth.EnableSecrets = $true

$success = $jsonAuth.UpdateString("oauth2.client_id","!!sharepoint|oauth2|client_id")
if ($success -eq $true) {
    $success = $jsonAuth.UpdateString("oauth2.client_secret","!!sharepoint|oauth2|client_secret")
}

if ($success -eq $true) {
    $success = $jsonAuth.UpdateString("oauth2.token_endpoint","!!sharepoint|oauth2|token_endpoint")
}

if ($success -eq $false) {
    $($jsonAuth.LastErrorText)
    exit
}

# Request Microsoft Graph permissions that were granted to the application.
$jsonAuth.UpdateString("oauth2.scope","https://graph.microsoft.com/.default")

# ---------------------------------------------------------------------------------------------------

$curl = New-Object Chilkat.HttpCurl

# Associate the OAuth2 configuration with HttpCurl.
# 
# When the request is executed, Chilkat automatically obtains an access token
# if needed and adds the Authorization: Bearer header to the HTTP request.
$curl.SetAuth($jsonAuth)

# Define variables whose values are already known.
# 
# These variables are referenced in curl commands using
# {{variable_name}} substitution syntax.
$curl.SetVar("sharepoint_hostname","example.sharepoint.com")
$curl.SetVar("site_name","test")

# The final request needs a Microsoft Graph site ID.
# 
# Because the application only knows the SharePoint site name,
# define a helper function that can retrieve the site record.
# HttpCurl can execute this function automatically when it needs
# to resolve the site_id variable.
$curl.AddFunction("getSite","GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}")

# Extract the "id" field from the getSite response and store it
# in the HttpCurl variable named "site_id".
$curl.AddOutput("getSite","id","site_id")

# The next value needed is the drive ID for the Documents document library.
# 
# This function lists the drives, also known as document libraries,
# belonging to the SharePoint site.
$curl.AddFunction("getDrives","GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives")

# Extract the ID of the drive whose name is "Documents".
# 
# AddOutput2 searches an array in the JSON response.  In this case:
# 
#   response array: value
#   match field:    name
#   match value:    Documents
#   case-sensitive: true
#   output field:   id
#   variable name:  document_library_id
# 
# The result is that document_library_id will contain the drive ID
# for the Documents document library.
$curl.AddOutput2("getDrives","value","name","Documents",$true,"id","document_library_id")

# The target Microsoft Graph request:
# 
# GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root/children
# 
# This lists the files and folders in the root folder of the Documents
# document library.
# 
# The {{site_id}} and {{document_library_id}} variables are not set directly
# by this program.  HttpCurl resolves them automatically by running the
# helper functions defined above.
$curlCommand = "GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root/children"

# Execute the request.
# 
# HttpCurl examines the target request and determines that it requires
# both site_id and document_library_id.
# 
# The execution plan becomes:
# 
#   1) Execute getSite to obtain site_id.
#   2) Execute getDrives to obtain document_library_id.
#   3) Substitute both variables into the target request.
#   4) Execute the root/children request.
# 
# The final HTTP response returned by DoYourThing is always the response
# from the target request, which is the last step in the plan.
$success = $curl.DoYourThing($curlCommand)
if ($success -eq $false) {
    $($curl.LastErrorText)
    exit
}

# A successful Graph response should return HTTP 200.
# Any other status code typically indicates an authentication,
# permission, site lookup, or document library lookup error.
$statusCode = $curl.StatusCode
if ($statusCode -ne 200) {
    $($curl.ResponseBodyStr)
    $("status code = " + $statusCode)
    exit
}

# The response body contains a JSON array named "value".
# Each element represents one file or folder in the root of the
# Documents document library.
$json = New-Object Chilkat.JsonObject
$json.EmitCompact = $false
$curl.GetResponseJson($json)
$($json.Emit())
$("")

# Count the number of items returned in the "value" array.
# 
# This includes both files and folders.
$numFiles = $json.SizeOfArray("value")
$("Number of files: " + $numFiles)
$("")

# Iterate over the files and folders returned by Microsoft Graph
# and display selected properties for each item.
$i = 0
while ($i -lt $numFiles) {
    $json.I = $i

    $("name: " + $json.StringOf("value[i].name"))
    $("webUrl: " + $json.StringOf("value[i].webUrl"))
    $("size: " + $json.StringOf("value[i].size"))
    $("id: " + $json.StringOf("value[i].id"))
    $("-")
    $i = $i + 1
}