(Delphi ActiveX) SharePoint List Document Libraries

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This example shows how to use Chilkat's HttpCurl class to list the document libraries in a SharePoint site. In Microsoft Graph, SharePoint document libraries are represented as drives. The example demonstrates how HttpCurl can automatically resolve a SharePoint site name to its Microsoft Graph site ID, then use that ID to retrieve and display the site's document libraries.

Note: This example requires Chilkat v11.5.0 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
jsonAuth: TChilkatJsonObject;
curl: TChilkatHttpCurl;
curlCommand: WideString;
statusCode: Integer;
json: TChilkatJsonObject;
i: Integer;
numDrives: Integer;

begin
success := 0;

// This example retrieves the document libraries for a SharePoint site.
// 
// In Microsoft Graph terminology, a document library is represented as a "drive".
// The example demonstrates how HttpCurl can automatically resolve a SharePoint
// site name to a site ID before requesting the site's document libraries.

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 := TChilkatJsonObject.Create(Self);

// 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 := 1;

success := jsonAuth.UpdateString('oauth2.client_id','!!sharepoint|oauth2|client_id');
if (success = 1) then
  begin
    success := jsonAuth.UpdateString('oauth2.client_secret','!!sharepoint|oauth2|client_secret');
  end;
if (success = 1) then
  begin
    success := jsonAuth.UpdateString('oauth2.token_endpoint','!!sharepoint|oauth2|token_endpoint');
  end;
if (success = 0) then
  begin
    Memo1.Lines.Add(jsonAuth.LastErrorText);
    Exit;
  end;

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

// ---------------------------------------------------------------------------------------------------

curl := TChilkatHttpCurl.Create(Self);

// 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.ControlInterface);

// Define variables whose values are already known.
// 
// These variables are referenced in the curl command using
// {{variable_name}} substitution syntax.
curl.SetVar('sharepoint_hostname','example.sharepoint.com');
curl.SetVar('site_name','test');

// The document libraries endpoint requires a Microsoft Graph site ID.
// 
// Because the application only knows the SharePoint site name,
// HttpCurl must first retrieve the corresponding site ID.
// 
// Define a function that can resolve the site_id variable when needed.
// HttpCurl may execute this function automatically if it determines that
// site_id is required by another request.
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".
// 
// Any later request that references {{site_id}} can use this value.
curl.AddOutput('getSite','id','site_id');

// The target Microsoft Graph request:
// 
// curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives
// 
// This request returns the document libraries belonging to the site.
// 
// Microsoft Graph refers to document libraries as "drives",
// so each object in the response represents one document library.
// 
// No Authorization header is included because HttpCurl automatically
// adds it when OAuth2 authentication is configured.
curlCommand := 'curl -X GET "https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives"';

// Execute the request.
// 
// HttpCurl examines the target curl command and determines that
// the variable {{site_id}} is required.
// 
// Because site_id is not yet known, HttpCurl searches for a function
// capable of producing it.  The getSite function provides the "id"
// output, which is mapped to the site_id variable.
// 
// The execution plan becomes:
// 
//   1) Execute getSite to obtain site_id.
//   2) Substitute {{site_id}} into the target request.
//   3) Execute the drives request.
// 
// The final HTTP response returned by DoYourThing is always the
// response from the target curl command, which is the last step in the plan.
success := curl.DoYourThing(curlCommand);
if (success = 0) then
  begin
    Memo1.Lines.Add(curl.LastErrorText);
    Exit;
  end;

// A successful Graph response should return HTTP 200.
// Any other status code typically indicates an authentication,
// permission, or resource lookup error.
statusCode := curl.StatusCode;
if (statusCode <> 200) then
  begin
    Memo1.Lines.Add(curl.ResponseBodyStr);
    Memo1.Lines.Add('status code = ' + IntToStr(statusCode));
    Exit;
  end;

// The response body contains a JSON array named "value".
// Each element of the array describes a SharePoint document library.
json := TChilkatJsonObject.Create(Self);
json.EmitCompact := 0;
curl.GetResponseJson(json.ControlInterface);
Memo1.Lines.Add(json.Emit());

// Iterate over the document libraries returned by Microsoft Graph
// and display selected properties for each library.
i := 0;
numDrives := json.SizeOfArray('value');
while i < numDrives do
  begin
    json.I := i;
    Memo1.Lines.Add('name: ' + json.StringOf('value[i].name'));
    Memo1.Lines.Add('description: ' + json.StringOf('value[i].description'));
    Memo1.Lines.Add('id: ' + json.StringOf('value[i].id'));
    Memo1.Lines.Add('webUrl: ' + json.StringOf('value[i].webUrl'));
    Memo1.Lines.Add('displayName: ' + json.StringOf('value[i].createdBy.user.displayName'));
    Memo1.Lines.Add('-');
    i := i + 1;
  end;

Memo1.Lines.Add('Success.');
end;