Delphi DLL Google Cloud Storage: Copy File (Object) to another Bucket

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Copies a fie (also known as an object) to another Google Cloud Storage bucket. This example copies the file "starfish.jpg" from the "chilkat-test" bucket to the "chilkat-images" bucket. In Google Cloud Storage, moving a file to a new bucket is a 2-step operation: First copy the file, then delete the original.

Documentation: https://cloud.google.com/storage/docs/renaming-copying-moving-objects

CURL Command

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

Delphi DLL Example

var
rest: HCkRest;
success: Boolean;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
sbResponseBody: HCkStringBuilder;
respStatusCode: Integer;
jsonResponse: HCkJsonObject;
kind: PWideChar;
totalBytesRewritten: PWideChar;
objectSize: PWideChar;
done: Boolean;
resourceKind: PWideChar;
resourceId: PWideChar;
resourceSelfLink: PWideChar;
resourceName: PWideChar;
resourceBucket: PWideChar;
resourceGeneration: PWideChar;
resourceMetageneration: PWideChar;
resourceContentType: PWideChar;
resourceTimeCreated: PWideChar;
resourceUpdated: PWideChar;
resourceStorageClass: PWideChar;
resourceTimeStorageClassUpdated: PWideChar;
resourceSize: PWideChar;
resourceMd5Hash: PWideChar;
resourceMediaLink: PWideChar;
resourceCrc32c: PWideChar;
resourceEtag: PWideChar;

begin
rest := CkRest_Create();

//  URL: https://www.googleapis.com/storage/v1/b/chilkat-bucket/o/starfish.jpg/rewriteTo/b/chilkat-images/o/starfish.jpg?project=MY_CLOUD_STORAGE_PROJECT
bTls := True;
port := 443;
bAutoReconnect := True;
success := CkRest_Connect(rest,'www.googleapis.com',port,bTls,bAutoReconnect);
if (success <> True) then
  begin
    Memo1.Lines.Add('ConnectFailReason: ' + IntToStr(CkRest_getConnectFailReason(rest)));
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

CkRest_AddHeader(rest,'Authorization','Bearer CLOUD_STORAGE_TOKEN');

sbResponseBody := CkStringBuilder_Create();
success := CkRest_FullRequestNoBodySb(rest,'POST','/storage/v1/b/chilkat-bucket/o/starfish.jpg/rewriteTo/b/chilkat-images/o/starfish.jpg?project=MY_CLOUD_STORAGE_PROJECT',sbResponseBody);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
respStatusCode := CkRest_getResponseStatusCode(rest);
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkRest__responseHeader(rest));
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponseBody));
    Exit;
  end;

jsonResponse := CkJsonObject_Create();
CkJsonObject_LoadSb(jsonResponse,sbResponseBody);

//  See the Online Tool for Generating JSON Parse Code

kind := CkJsonObject__stringOf(jsonResponse,'kind');
totalBytesRewritten := CkJsonObject__stringOf(jsonResponse,'totalBytesRewritten');
objectSize := CkJsonObject__stringOf(jsonResponse,'objectSize');
done := CkJsonObject_BoolOf(jsonResponse,'done');
resourceKind := CkJsonObject__stringOf(jsonResponse,'resource.kind');
resourceId := CkJsonObject__stringOf(jsonResponse,'resource.id');
resourceSelfLink := CkJsonObject__stringOf(jsonResponse,'resource.selfLink');
resourceName := CkJsonObject__stringOf(jsonResponse,'resource.name');
resourceBucket := CkJsonObject__stringOf(jsonResponse,'resource.bucket');
resourceGeneration := CkJsonObject__stringOf(jsonResponse,'resource.generation');
resourceMetageneration := CkJsonObject__stringOf(jsonResponse,'resource.metageneration');
resourceContentType := CkJsonObject__stringOf(jsonResponse,'resource.contentType');
resourceTimeCreated := CkJsonObject__stringOf(jsonResponse,'resource.timeCreated');
resourceUpdated := CkJsonObject__stringOf(jsonResponse,'resource.updated');
resourceStorageClass := CkJsonObject__stringOf(jsonResponse,'resource.storageClass');
resourceTimeStorageClassUpdated := CkJsonObject__stringOf(jsonResponse,'resource.timeStorageClassUpdated');
resourceSize := CkJsonObject__stringOf(jsonResponse,'resource.size');
resourceMd5Hash := CkJsonObject__stringOf(jsonResponse,'resource.md5Hash');
resourceMediaLink := CkJsonObject__stringOf(jsonResponse,'resource.mediaLink');
resourceCrc32c := CkJsonObject__stringOf(jsonResponse,'resource.crc32c');
resourceEtag := CkJsonObject__stringOf(jsonResponse,'resource.etag');

CkRest_Dispose(rest);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jsonResponse);

Sample JSON Response Body

{
  "kind": "storage#rewriteResponse",
  "totalBytesRewritten": "6229",
  "objectSize": "6229",
  "done": true,
  "resource": {
    "kind": "storage#object",
    "id": "chilkat-images/starfish.jpg/1540298057547474",
    "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-images/o/starfish.jpg",
    "name": "starfish.jpg",
    "bucket": "chilkat-images",
    "generation": "1540298057547474",
    "metageneration": "1",
    "contentType": "image/jpeg",
    "timeCreated": "2018-10-23T12:34:17.547Z",
    "updated": "2018-10-23T12:34:17.547Z",
    "storageClass": "MULTI_REGIONAL",
    "timeStorageClassUpdated": "2018-10-23T12:34:17.547Z",
    "size": "6229",
    "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
    "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-images/o/starfish.jpg?generation=1540298057547474&alt=media",
    "crc32c": "9RjgwQ==",
    "etag": "CNL9xbTJnN4CEAE="
  }
}