Pascal (Lazarus/Delphi)

Amazon Cognito - List Users

See more Amazon Cognito Examples

Lists the users in the Amazon Cognito user pool. 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.AuthAws,
  Chilkat.Rest,
  Chilkat.JsonObject,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  authAws: TAuthAws;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  json: TJsonObject;
  sbRequestBody: TStringBuilder;
  sbResponseBody: TStringBuilder;
  respStatusCode: Integer;
  jsonResponse: TJsonObject;
  Enabled: Boolean;
  UserCreateDate: string;
  UserLastModifiedDate: string;
  UserStatus: string;
  Username: string;
  j: Integer;
  count_j: Integer;
  Name: string;
  Value: string;
  i: Integer;
  count_i: Integer;

begin
  success := False;

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

  rest := TRest.Create;

  authAws := TAuthAws.Create;
  authAws.AccessKey := 'AWS_ACCESS_KEY';
  authAws.SecretKey := 'AWS_SECRET_KEY';
  //  Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
  authAws.Region := 'us-west-2';
  authAws.ServiceName := 'cognito-idp';
  //  SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
  rest.SetAuthAws(authAws);

  //  URL: https://cognito-idp.us-west-2.amazonaws.com/
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  //  Use the same region as specified above.
  success := rest.Connect('cognito-idp.us-west-2.amazonaws.com',port,bTls,bAutoReconnect);
  if (success <> True) then
    begin
      WriteLn('ConnectFailReason: ' + rest.ConnectFailReason);
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Note: The above code does not need to be repeatedly called for each REST request.
  //  The rest object can be setup once, and then many requests can be sent.  Chilkat will automatically
  //  reconnect within a FullRequest* method as needed.  It is only the very first connection that is explicitly
  //  made via the Connect method.

  //  The following JSON is sent in the request body.

  //  {
  //      "UserPoolId": "us-west-2_yt6WzO3SA"
  //  }
  //  

  json := TJsonObject.Create;
  json.UpdateString('UserPoolId','us-west-2_yt6WzO3SA');

  rest.AddHeader('Content-Type','application/x-amz-json-1.0');
  rest.AddHeader('X-Amz-Target','AWSCognitoIdentityProviderService.ListUsers');
  rest.AddHeader('Accept-Encoding','identity');

  sbRequestBody := TStringBuilder.Create;
  json.EmitSb(sbRequestBody);
  sbResponseBody := TStringBuilder.Create;
  success := rest.FullRequestSb('POST','/',sbRequestBody,sbResponseBody);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;
  respStatusCode := rest.ResponseStatusCode;
  WriteLn('response status code = ' + respStatusCode);
  if (respStatusCode <> 200) then
    begin
      WriteLn('Response Status Code = ' + respStatusCode);
      WriteLn('Response Header:');
      WriteLn(rest.ResponseHeader);
      WriteLn('Response Body:');
      WriteLn(sbResponseBody.GetAsString());
      Exit;
    end;

  jsonResponse := TJsonObject.Create;
  jsonResponse.LoadSb(sbResponseBody);

  jsonResponse.EmitCompact := False;
  WriteLn(jsonResponse.Emit());

  //  Sample JSON response:
  //  (Sample code for parsing the JSON response is shown below)

  //  Use this online tool to generate parsing code from sample JSON: 
  //  Generate Parsing Code from JSON

  //  {
  //    "Users": [
  //      {
  //        "Attributes": [
  //          {
  //            "Name": "sub",
  //            "Value": "1874cf28-00d3-4ac1-a24a-68dcb0cecf09"
  //          },
  //          {
  //            "Name": "email_verified",
  //            "Value": "true"
  //          },
  //          {
  //            "Name": "phone_number_verified",
  //            "Value": "true"
  //          },
  //          {
  //            "Name": "phone_number",
  //            "Value": "+16302581871"
  //          },
  //          {
  //            "Name": "email",
  //            "Value": "admin@chilkatsoft.com"
  //          }
  //        ],
  //        "Enabled": true,
  //        "UserCreateDate": 1.636404386657E9,
  //        "UserLastModifiedDate": 1.636404386657E9,
  //        "UserStatus": "FORCE_CHANGE_PASSWORD",
  //        "Username": "matt"
  //      },
  //      {
  //  	. . .
  //      }
  //    ]
  //  }

  i := 0;
  count_i := jsonResponse.SizeOfArray('Users');
  while i < count_i do
    begin
      jsonResponse.I := i;
      Enabled := jsonResponse.BoolOf('Users[i].Enabled');
      UserCreateDate := jsonResponse.StringOf('Users[i].UserCreateDate');
      UserLastModifiedDate := jsonResponse.StringOf('Users[i].UserLastModifiedDate');
      UserStatus := jsonResponse.StringOf('Users[i].UserStatus');
      Username := jsonResponse.StringOf('Users[i].Username');
      j := 0;
      count_j := jsonResponse.SizeOfArray('Users[i].Attributes');
      while j < count_j do
        begin
          jsonResponse.J := j;
          Name := jsonResponse.StringOf('Users[i].Attributes[j].Name');
          Value := jsonResponse.StringOf('Users[i].Attributes[j].Value');
          j := j + 1;
        end;

      i := i + 1;
    end;



  rest.Free;
  authAws.Free;
  json.Free;
  sbRequestBody.Free;
  sbResponseBody.Free;
  jsonResponse.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.