Pascal (Lazarus/Delphi)

How to Generate an Azure Storage Account Shared Access Signature (SAS)

See more Azure Cloud Storage Examples

Shows how to generate a Shared Access Signature (SAS) for an Azure Storage Account.

Note: This example requires Chilkat v9.5.0.65 or greater.

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.FileAccess,
  Chilkat.AuthAzureSAS,
  Chilkat.CkDateTime;

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

procedure RunDemo;
var
  authSas: TAuthAzureSAS;
  dt: TCkDateTime;
  sasToken: string;
  fac: TFileAccess;

begin
  //  Note: Requires Chilkat v9.5.0.65 or greater.

  //  This requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  //  --------------------------------------------------------------------------
  //  Create a Shared Access Signature (SAS) token for an Azure Storage Account.
  //  --------------------------------------------------------------------------

  //  See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/constructing-an-account-sas 
  //  for details regarding the Azure Storage Account SAS fields.

  authSas := TAuthAzureSAS.Create;
  authSas.AccessKey := 'AZURE_ACCESS_KEY';

  //  Specify the format of the string to sign.
  //  Each comma character in the following string represents a LF ("\n") character.
  //  The names specified in the StringToSign are replaced with the values specified
  //  in the subsequent calls to SetTokenParam and SetNonTokenParam,.

  //  Note: The trailing comma in the StringToSign is intentional and important. This indicates that the 
  //  string to sign will end with a "\n".

  //  Also note: The names in the StringToSign are case sensitive.  The names
  //  specified in the 1st argument in the calls to SetNonTokenParam and SetTokenParam should
  //  match a name listed in StringToSign. 
  authSas.StringToSign := 'accountname,signedpermissions,signedservice,signedresourcetype,signedstart,signedexpiry,signedIP,signedProtocol,signedversion,';

  //   The account name is "chilkat".  Use your own account name instead of "chilkat".
  //   Also use your own container name instead of "mycontainer".
  authSas.SetNonTokenParam('accountname','chilkat');

  authSas.SetTokenParam('signedpermissions','sp','rwdlacup');
  authSas.SetTokenParam('signedservice','ss','bfqt');
  authSas.SetTokenParam('signedresourcetype','srt','sco');

  dt := TCkDateTime.Create;
  dt.SetFromCurrentSystemTime();
  authSas.SetTokenParam('signedstart','st',dt.GetAsIso8601('YYYY-MM-DDThh:mmTZD',False));

  //  This SAS token will be valid for 30 days.
  dt.AddDays(30);
  authSas.SetTokenParam('signedexpiry','se',dt.GetAsIso8601('YYYY-MM-DDThh:mmTZD',False));

  authSas.SetTokenParam('signedProtocol','spr','https');

  //   Specifiy values and query param names for each field.
  //   If a field is not specified, then an empty string will be used for its value.
  authSas.SetTokenParam('signedversion','sv','2015-04-05');

  //  Note that we did not call SetTokenParam for "signedIP".  For any omitted fields
  //  the value will default to the empty string.

  //  Generate the SAS token.
  sasToken := authSas.GenerateToken();
  if (authSas.LastMethodSuccess <> True) then
    begin
      WriteLn(authSas.LastErrorText);
      Exit;
    end;

  WriteLn('SAS token: ' + sasToken);

  //  Save the SAS token to a file.
  //  We can then use this pre-generated token for future Azure Storage Account operations.
  fac := TFileAccess.Create;
  fac.WriteEntireTextFile('qa_data/tokens/azureStorageAccountSas.txt',sasToken,'utf-8',False);


  authSas.Free;
  dt.Free;
  fac.Free;

end;

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

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.