Delphi ActiveX Google Cloud Storage: List Objects in a Bucket

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Retrieves a list of objects in the Google Cloud Storage bucket. The name of the bucket is specified in the URL's path. This example retrieves a listing of the objects in the "chilkat-test" bucket.

Documentation: https://cloud.google.com/storage/docs/json_api/v1/objects/list

CURL Command

curl -X GET https://www.googleapis.com/storage/v1/b/chilkat-bucket/o?project=MY_CLOUD_STORAGE_PROJECT \
    --header "Authorization: Bearer CLOUD_STORAGE_TOKEN"

Delphi ActiveX Example

var
rest: TChilkatRest;
success: Integer;
bTls: Integer;
port: Integer;
bAutoReconnect: Integer;
sbResponseBody: TChilkatStringBuilder;
respStatusCode: Integer;
jsonResponse: TChilkatJsonObject;
i: Integer;
count_i: Integer;
kind: WideString;
id: WideString;
selfLink: WideString;
name: WideString;
bucket: WideString;
generation: WideString;
metageneration: WideString;
contentType: WideString;
timeCreated: WideString;
updated: WideString;
storageClass: WideString;
timeStorageClassUpdated: WideString;
size: WideString;
md5Hash: WideString;
mediaLink: WideString;
crc32c: WideString;
etag: WideString;

begin
rest := TChilkatRest.Create(Self);

//  URL: https://www.googleapis.com/storage/v1/b/chilkat-bucket/o?project=MY_CLOUD_STORAGE_PROJECT
bTls := 1;
port := 443;
bAutoReconnect := 1;
success := rest.Connect('www.googleapis.com',port,bTls,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add('ConnectFailReason: ' + IntToStr(rest.ConnectFailReason));
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

rest.AddHeader('Authorization','Bearer CLOUD_STORAGE_TOKEN');

sbResponseBody := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestNoBodySb('GET','/storage/v1/b/chilkat-bucket/o?project=MY_CLOUD_STORAGE_PROJECT',sbResponseBody.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;
respStatusCode := rest.ResponseStatusCode;
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(rest.ResponseHeader);
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(sbResponseBody.GetAsString());
    Exit;
  end;

jsonResponse := TChilkatJsonObject.Create(Self);
jsonResponse.LoadSb(sbResponseBody.ControlInterface);

//  See the Online Tool for Generating JSON Parse Code

kind := jsonResponse.StringOf('kind');
i := 0;
count_i := jsonResponse.SizeOfArray('items');
while i < count_i do
  begin
    jsonResponse.I := i;
    kind := jsonResponse.StringOf('items[i].kind');
    id := jsonResponse.StringOf('items[i].id');
    selfLink := jsonResponse.StringOf('items[i].selfLink');
    name := jsonResponse.StringOf('items[i].name');
    bucket := jsonResponse.StringOf('items[i].bucket');
    generation := jsonResponse.StringOf('items[i].generation');
    metageneration := jsonResponse.StringOf('items[i].metageneration');
    contentType := jsonResponse.StringOf('items[i].contentType');
    timeCreated := jsonResponse.StringOf('items[i].timeCreated');
    updated := jsonResponse.StringOf('items[i].updated');
    storageClass := jsonResponse.StringOf('items[i].storageClass');
    timeStorageClassUpdated := jsonResponse.StringOf('items[i].timeStorageClassUpdated');
    size := jsonResponse.StringOf('items[i].size');
    md5Hash := jsonResponse.StringOf('items[i].md5Hash');
    mediaLink := jsonResponse.StringOf('items[i].mediaLink');
    crc32c := jsonResponse.StringOf('items[i].crc32c');
    etag := jsonResponse.StringOf('items[i].etag');
    i := i + 1;
  end;

Sample JSON Response Body

{
  "kind": "storage#objects",
  "items": [
    {
      "kind": "storage#object",
      "id": "chilkat-bucket/hedgehogs.jpg/1540253106638630",
      "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket/o/hedgehogs.jpg",
      "name": "hedgehogs.jpg",
      "bucket": "chilkat-bucket",
      "generation": "1540253106638630",
      "metageneration": "1",
      "contentType": "image/jpeg",
      "timeCreated": "2018-10-23T00:05:06.638Z",
      "updated": "2018-10-23T00:05:06.638Z",
      "storageClass": "MULTI_REGIONAL",
      "timeStorageClassUpdated": "2018-10-23T00:05:06.638Z",
      "size": "48573",
      "md5Hash": "TE1U6fQlD6MOVGaQbwGinQ==",
      "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-bucket/o/hedgehogs.jpg?generation=1540253106638630&alt=media",
      "crc32c": "1B2d6g==",
      "etag": "CKaepPqhm94CEAE="
    },
    {
      "kind": "storage#object",
      "id": "chilkat-bucket/penguins.jpg/1540253106941673",
      "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket/o/penguins.jpg",
      "name": "penguins.jpg",
      "bucket": "chilkat-bucket",
      "generation": "1540253106941673",
      "metageneration": "1",
      "contentType": "image/jpeg",
      "timeCreated": "2018-10-23T00:05:06.941Z",
      "updated": "2018-10-23T00:05:06.941Z",
      "storageClass": "MULTI_REGIONAL",
      "timeStorageClassUpdated": "2018-10-23T00:05:06.941Z",
      "size": "777835",
      "md5Hash": "nTd7EM53jEk4s8fixjoimg==",
      "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-bucket/o/penguins.jpg?generation=1540253106941673&alt=media",
      "crc32c": "ixxYVw==",
      "etag": "COndtvqhm94CEAE="
    },
    {
      "kind": "storage#object",
      "id": "chilkat-bucket/starfish.jpg/1540253106637454",
      "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket/o/starfish.jpg",
      "name": "starfish.jpg",
      "bucket": "chilkat-bucket",
      "generation": "1540253106637454",
      "metageneration": "1",
      "contentType": "image/jpeg",
      "timeCreated": "2018-10-23T00:05:06.636Z",
      "updated": "2018-10-23T00:05:06.636Z",
      "storageClass": "MULTI_REGIONAL",
      "timeStorageClassUpdated": "2018-10-23T00:05:06.636Z",
      "size": "6229",
      "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
      "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-bucket/o/starfish.jpg?generation=1540253106637454&alt=media",
      "crc32c": "9RjgwQ==",
      "etag": "CI6VpPqhm94CEAE="
    }
  ]
}