(Perl) Download a SharePoint File by Path using HttpCurl

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This example shows how to use Chilkat's HttpCurl class to download a file from SharePoint when the file path within the document library is already known. The example uses Microsoft Graph to automatically resolve the SharePoint site name to a site ID, find the drive ID for the Documents document library, and then download the file directly by path using the Graph root:/path:/content syntax.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

$success = 0;

# This example downloads a file from a SharePoint Documents document library
# when the file's path within the library is already known.
# 
# The file downloaded in this example is:
# 
#   images/sea_creatures/starfish.jpg
# 
# Unlike the previous example  that searched for a file by name and obtained
# its Microsoft Graph item ID, this example uses the Graph path-based API.
# 
# The example demonstrates how HttpCurl automatically resolves:
# 
#   site_name  -> site_id
#   site_id    -> document_library_id
# 
# and then uses the known file path to download the file directly.

$success = 0;

# --------------------------------------------------------------------------------------------------------
# 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 = chilkat::CkJsonObject->new();

# 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->put_EnableSecrets(1);

$success = $jsonAuth->UpdateString("oauth2.client_id","!!sharepoint|oauth2|client_id");
if ($success == 1) {
    $success = $jsonAuth->UpdateString("oauth2.client_secret","!!sharepoint|oauth2|client_secret");
}

if ($success == 1) {
    $success = $jsonAuth->UpdateString("oauth2.token_endpoint","!!sharepoint|oauth2|token_endpoint");
}

if ($success == 0) {
    print $jsonAuth->lastErrorText() . "\r\n";
    exit;
}

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

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

$curl = chilkat::CkHttpCurl->new();

# 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 values that 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 download request requires a Microsoft Graph site ID.
# 
# Because the application only knows the SharePoint site name,
# define a helper function that can retrieve the site information.
$curl->AddFunction("getSite","GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}");

# Extract the site's ID and store it in the HttpCurl variable named site_id.
$curl->AddOutput("getSite","id","site_id");

# The download request also requires the drive ID of the Documents
# document library.
# 
# Microsoft Graph refers to document libraries as "drives".
$curl->AddFunction("getDrives","GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives");

# Search the returned drives for the one named "Documents"
# and save its drive ID in the document_library_id variable.
$curl->AddOutput2("getDrives","value","name","Documents",1,"id","document_library_id");

# This is the target Microsoft Graph request.
# 
# GET /sites/{site-id}/drives/{drive-id}/root:/{path-to-file}:/content
# 
# The path-based API allows a file to be downloaded directly when its
# location within the document library is known.
# 
# The -L option causes HttpCurl to follow redirects.
# Microsoft Graph typically returns a redirect to the actual download URL.
# 
# The -o option specifies the output filename.
# The --output-dir option specifies the directory where the downloaded
# file will be saved.
$curlCommand = "GET -L --output-dir c:/temp/qa_output -o starfish.jpg https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root:/images/sea_creatures/starfish.jpg:/content";

# Execute the request.
# 
# HttpCurl examines the target request and determines that both
# site_id and document_library_id are required.
# 
# To obtain these values, it automatically builds and executes
# the following dependency chain:
# 
#   1) getSite    -> site_id
#   2) getDrives  -> document_library_id
#   3) download   -> file content
# 
# The file is streamed directly to the output file specified by
# the curl command.
$success = $curl->DoYourThing($curlCommand);
if ($success == 0) {
    print $curl->lastErrorText() . "\r\n";
    exit;
}

# A successful Graph response should return HTTP 200.
# Any other status code typically indicates an authentication,
# permission, site lookup, document library lookup, or file lookup error.
$statusCode = $curl->get_StatusCode();
if ($statusCode != 200) {
    print $curl->responseBodyStr() . "\r\n";
    print "status code = " . $statusCode . "\r\n";
    exit;
}

# The file has been downloaded successfully and written to:
# 
#   c:/temp/qa_output/starfish.jpg
# 
print "Success." . "\r\n";