Pascal (Lazarus/Delphi)

Google Cloud Storage List Buckets

See more Google Cloud Storage Examples

Demonstrates how to retrieve a list of buckets for a given project. 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.HttpResponse,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  http: THttp;
  resp: THttpResponse;
  responseCode: Integer;
  json: TJsonObject;
  kind: string;
  i: Integer;
  count_i: Integer;
  id: string;
  selfLink: string;
  projectNumber: string;
  name: string;
  timeCreated: string;
  updated: string;
  metageneration: string;
  iamConfigurationBucketPolicyOnlyEnabled: Boolean;
  location: string;
  storageClass: string;
  etag: string;

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;

  http := THttp.Create;
  http.AuthToken := jsonToken.StringOf('access_token');

  //  For more info see Cloud Storage Documentation - Buckets: list 
  //  
  success := http.SetUrlVar('PROJECT_ID','chilkattest-1050');
  resp := THttpResponse.Create;
  success := http.HttpNoBody('GET','https://www.googleapis.com/storage/v1/b?project={$PROJECT_ID}',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');

  json := TJsonObject.Create;
  success := json.Load(resp.BodyStr);

  json.EmitCompact := False;

  WriteLn(json.Emit());

  //  A response code = 200 indicates success, and the response body contains JSON such as this:

  //  {
  //    "kind": "storage#buckets",
  //    "items": [
  //      {
  //        "kind": "storage#bucket",
  //        "id": "chilkat-bucket",
  //        "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket",
  //        "projectNumber": "5332332985",
  //        "name": "chilkat-bucket",
  //        "timeCreated": "2018-10-23T00:04:44.507Z",
  //        "updated": "2018-10-23T00:04:44.507Z",
  //        "metageneration": "1",
  //        "iamConfiguration": {
  //          "bucketPolicyOnly": {
  //            "enabled": false
  //          }
  //        },
  //        "location": "US",
  //        "storageClass": "MULTI_REGIONAL",
  //        "etag": "CAE="
  //      },
  //      {
  //        "kind": "storage#bucket",
  //        "id": "chilkat-images",
  //        "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-images",
  //        "projectNumber": "5332332985",
  //        "name": "chilkat-images",
  //        "timeCreated": "2018-10-23T11:24:43.000Z",
  //        "updated": "2018-10-23T11:24:43.000Z",
  //        "metageneration": "1",
  //        "iamConfiguration": {
  //          "bucketPolicyOnly": {
  //            "enabled": false
  //          }
  //        },
  //        "location": "US",
  //        "storageClass": "MULTI_REGIONAL",
  //        "etag": "CAE="
  //      }
  //    ]
  //  }

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

  kind := json.StringOf('kind');
  i := 0;
  count_i := json.SizeOfArray('items');
  while i < count_i do
    begin
      json.I := i;
      kind := json.StringOf('items[i].kind');
      id := json.StringOf('items[i].id');
      selfLink := json.StringOf('items[i].selfLink');
      projectNumber := json.StringOf('items[i].projectNumber');
      name := json.StringOf('items[i].name');
      timeCreated := json.StringOf('items[i].timeCreated');
      updated := json.StringOf('items[i].updated');
      metageneration := json.StringOf('items[i].metageneration');
      iamConfigurationBucketPolicyOnlyEnabled := json.BoolOf('items[i].iamConfiguration.bucketPolicyOnly.enabled');
      location := json.StringOf('items[i].location');
      storageClass := json.StringOf('items[i].storageClass');
      etag := json.StringOf('items[i].etag');
      i := i + 1;
    end;



  jsonToken.Free;
  http.Free;
  resp.Free;
  json.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.