(Delphi DLL) Upload using Azure Storage Account Shared Access Signature (SAS) Authorization

Sample code to upload binary bytes to a block blob in Azure Cloud Storage using an Azure Storage Account Shared Access Signature (SAS) Authorization. This creates a block blob, or replaces an existing block blob.

Note: The maximum size of a block blob created by uploading in a single step is 64MB. For larger files, the upload must be broken up into blocks. There is another Chilkat example for that..

Note: This example requires Chilkat v9.5.0.65 or later.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, StringBuilder, Rest, BinData;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
success: Boolean;
sbToken: HCkStringBuilder;
binData: HCkBinData;
sbResponse: HCkStringBuilder;

begin
// Note: This example requires Chilkat v9.5.0.65 or greater.

// Azure Blob Service Example: Upload binary bytes to a block blob.
// This uses a Shared Access Signature (SAS) for Authorization.
// This creates a new block blob or replaces an existing one in its entirety.
// See also: https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx

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

rest := CkRest_Create();

// Connect to the Azure Storage Blob Service
bTls := True;
port := 443;
bAutoReconnect := True;
// In this example, the storage account name is "chilkat".
success := CkRest_Connect(rest,'chilkat.blob.core.windows.net',port,bTls,bAutoReconnect);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// ----------------------------------------------------------------------------------------------
// The code above this comment could be placed inside a function/subroutine within the application
// because the connection does not need to be made for every request.  Once the connection is made
// the app may send many requests..
// ----------------------------------------------------------------------------------------------

// Note: The application does not need to explicitly set the following
// headers: Content-Length, x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// Let's load a previously computed Azure Storage Account SAS token and use it.
// See How to Create an Azure Storage Account Shared Access Signature
sbToken := CkStringBuilder_Create();
success := CkStringBuilder_LoadFile(sbToken,'qa_data/tokens/azureStorageAccountSas.txt','utf-8');
if (success <> True) then
  begin
    Memo1.Lines.Add('Failed to load SAS token.');
    Exit;
  end;

// Add the Shared Access Signature query params for authorization.
CkRest_AddQueryParams(rest,CkStringBuilder__getAsString(sbToken));

// IMPORTANT: Make sure to set the x-ms-blob-type header:
success := CkRest_AddHeader(rest,'x-ms-blob-type','BlockBlob');

// IMPORTANT: Make sure to add the x-ms-date header.
// When the header name is "x-ms-date", Chilkat will recognize the keyword "NOW" 
// and will substitute the current system date/time formatted as required by Microsoft.
success := CkRest_AddHeader(rest,'x-ms-date','NOW');

// For this example, we'll just load a JPG file into memory..
binData := CkBinData_Create();
success := CkBinData_LoadFile(binData,'qa_data/jpg/starfish.jpg');
if (success <> True) then
  begin
    Memo1.Lines.Add('Failed to load JPG file.');
    Exit;
  end;

// Note: The maximum size of a block blob created by uploading in a single step is 64MB.  
// For larger files, the upload must be broken up into blocks.  There is another Chilkat example for that..
sbResponse := CkStringBuilder_Create();
success := CkRest_FullRequestBd(rest,'PUT','/mycontainer/starfish.jpg',binData,sbResponse);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// When successful, the Azure Storage service will respond with a 201 response status code,
// with no response body.
if (CkRest_getResponseStatusCode(rest) <> 201) then
  begin
    // Examine the request/response to see what happened.
    Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
    Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
    Memo1.Lines.Add('response body (if any): ' + CkStringBuilder__getAsString(sbResponse));
    Memo1.Lines.Add('---');
    Memo1.Lines.Add('LastRequestStartLine: ' + CkRest__lastRequestStartLine(rest));
    Memo1.Lines.Add('LastRequestHeader: ' + CkRest__lastRequestHeader(rest));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

Memo1.Lines.Add('Success.');

CkRest_Dispose(rest);
CkStringBuilder_Dispose(sbToken);
CkBinData_Dispose(binData);
CkStringBuilder_Dispose(sbResponse);

end;