Pascal (Lazarus/Delphi)

Upload File to Google Cloud Storage

See more Google Cloud Storage Examples

Demonstrates how to upload a file to Google Cloud Storage. 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.HttpRequest,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  http: THttp;
  sbPath: TStringBuilder;
  numReplaced: Integer;
  req: THttpRequest;
  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"

  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/googleCloudStorage.json');
  if (success = False) then
    begin
      WriteLn(jsonToken.LastErrorText);
      Exit;
    end;

  //  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 := jsonToken.StringOf('access_token');

  sbPath := TStringBuilder.Create;
  sbPath.Append('/upload/storage/v1/b/bucket_name/o?uploadType=media&name=object_name');
  numReplaced := sbPath.Replace('bucket_name','chilkat-bucket-b');
  numReplaced := sbPath.Replace('object_name','penguins.jpg');

  req := THttpRequest.Create;
  req.HttpVerb := 'POST';
  req.Path := sbPath.GetAsString();
  req.ContentType := 'image/jpeg';
  //  Indicate the file to be streamed in the request body when the HTTP POST is sent.
  req.StreamBodyFromFile('qa_data/jpg/penguins.jpg');

  resp := THttpResponse.Create;
  success := http.HttpSReq('www.googleapis.com',443,True,req,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/penguins.jpg/1502643657837855",
  //   "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/penguins.jpg",
  //   "name": "penguins.jpg",
  //   "bucket": "chilkat-ocean",
  //   "generation": "1502643657837855",
  //   "metageneration": "1",
  //   "contentType": "image/jpeg",
  //   "timeCreated": "2017-08-13T17:00:57.811Z",
  //   "updated": "2017-08-13T17:00:57.811Z",
  //   "storageClass": "MULTI_REGIONAL",
  //   "timeStorageClassUpdated": "2017-08-13T17:00:57.811Z",
  //   "size": "777835",
  //   "md5Hash": "nTd7EM53jEk4s8fixjoimg==",
  //   "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/penguins.jpg?generation=1502643657837855&alt=media",
  //   "crc32c": "ixxYVw==",
  //   "etag": "CJ+azOvX1NUCEAE="
  //  }


  jsonToken.Free;
  http.Free;
  sbPath.Free;
  req.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.