Pascal (Lazarus/Delphi)
Upload String to Google Cloud Storage

Demonstrates how to upload an in-memory string to Google Cloud Storage.
Chilkat Pascal (Lazarus/Delphi) Downloads

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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.Http,
  Chilkat.StringBuilder,
  Chilkat.HttpResponse,
  Chilkat.Xml;

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

procedure RunDemo;
var
  success: Boolean;
  sbToken: TStringBuilder;
  http: THttp;
  xml: TXml;
  sbXml: TStringBuilder;
  url: string;
  resp: THttpResponse;
  responseCode: Integer;

begin
  success := False;

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

  //  This example uses a previously obtained access token having permission for the 
  //  scope "https://www.googleapis.com/auth/cloud-platform"

  //  In this example, Get Google Cloud Storage OAuth2 Access Token, 
  //  the service account access token was saved to a text file.  This example fetches the access token from the file..
  sbToken := TStringBuilder.Create;
  sbToken.LoadFile('qa_data/tokens/googleCloudStorageAccessToken.txt','utf-8');

  //  Send a POST equivalent to this curl command.
  //  The content of the file is contained in the request body.

  //  curl -X POST --data-binary @[OBJECT] \
  //      -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  //      -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
  //      "https://www.googleapis.com/upload/storage/v1/b/[BUCKET_NAME]/o?uploadType=media&name=[OBJECT_NAME]"

  http := THttp.Create;
  http.AuthToken := sbToken.GetAsString();

  //  Create an XML document, and write it to a StringBuilder.
  //  We'll be uploading this XML document.
  xml := TXml.Create;
  xml.Tag := 'note';
  xml.UpdateChildContent('to','Tove');
  xml.UpdateChildContent('from','Jani');
  xml.UpdateChildContent('heading','Reminder');
  xml.UpdateChildContent('body','Don''t forget me this weekend!');

  //  Write the XML to sbXml.
  sbXml := TStringBuilder.Create;
  xml.GetXmlSb(sbXml);

  //  sbXml contains this:

  //  <note>
  //      <to>Tove</to>
  //      <from>Jani</from>
  //      <heading>Reminder</heading>
  //      <body>Don't forget me this weekend!</body>
  //  </note>

  //  Construct a URL to upload to an object named "test.xml" in the "chilkat-ocean" bucket.
  http.SetUrlVar('bucket_name','chilkat-ocean');
  http.SetUrlVar('object_name','test.xml');
  url := 'https://www.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=media&name={$object_name}';

  resp := THttpResponse.Create;
  success := http.HttpSb('POST',url,sbXml,'utf-8','application/xml',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  responseCode := resp.StatusCode;
  if (responseCode = 401) then
    begin
      WriteLn(resp.BodyStr);
      WriteLn('If invalid credentials, then it is likely the access token expired.');
      WriteLn('Your app should automatically fetch a new access token and re-try.');
      Exit;
    end;

  WriteLn('Response code: ' + responseCode);
  WriteLn('Response body');
  WriteLn(resp.BodyStr);

  //  A successful response looks like this:
  //  Response code: 200
  //  Response body
  //  {
  //   "kind": "storage#object",
  //   "id": "chilkat-ocean/test.xml/1502669565429870",
  //   "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/test.xml",
  //   "name": "test.xml",
  //   "bucket": "chilkat-ocean",
  //   "generation": "1502669565429870",
  //   "metageneration": "1",
  //   "contentType": "application/xml",
  //   "timeCreated": "2017-08-14T00:12:45.379Z",
  //   "updated": "2017-08-14T00:12:45.379Z",
  //   "storageClass": "MULTI_REGIONAL",
  //   "timeStorageClassUpdated": "2017-08-14T00:12:45.379Z",
  //   "size": "181",
  //   "md5Hash": "TCR0L7TWsw2TzOvfNvgEfA==",
  //   "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/test.xml?generation=1502669565429870&alt=media",
  //   "crc32c": "ZFd5sA==",
  //   "etag": "CO6Qpq241dUCEAE="
  //  }


  sbToken.Free;
  http.Free;
  xml.Free;
  sbXml.Free;
  resp.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.