(PowerBuilder) Streaming Decrypt HTTP Response

If the an encrypted file was previously uploaded, this example demonstrates how to download and decrypt in a streaming way.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Rest
integer li_BTls
integer li_Port
integer li_BAutoReconnect
integer li_Success
integer li_ResponseStatusCode
string ls_ErrResponse
oleobject loo_Crypt
oleobject loo_ReceiveStream
oleobject loo_DecryptStream
oleobject loo_DecryptStreamTask

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

loo_Rest = create oleobject
// Use "Chilkat_9_5_0.Rest" for versions of Chilkat < 10.0.0
li_rc = loo_Rest.ConnectToNewObject("Chilkat.Rest")
if li_rc < 0 then
    destroy loo_Rest
    MessageBox("Error","Connecting to COM object failed")
    return
end if

li_BTls = 1
li_Port = 443
li_BAutoReconnect = 1
li_Success = loo_Rest.Connect("chilkatdownload.com",li_Port,li_BTls,li_BAutoReconnect)

// Send the request to download a file.
li_Success = loo_Rest.SendReqNoBody("GET","/9.5.0.83/chilkat-9.5.0-python-3.8-x64.zip")
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    return
end if

// Read the response header.
li_ResponseStatusCode = loo_Rest.ReadResponseHeader()
if li_ResponseStatusCode < 0 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    return
end if

Write-Debug "Response status code = " + string(li_ResponseStatusCode)

// We expect a 200 response status if the JPG data is coming.
// Otherwise, we'll get a string response body with an error message(or no response body).
if li_ResponseStatusCode <> 200 then
    ls_ErrResponse = loo_Rest.ReadRespBodyString()
    if loo_Rest.LastMethodSuccess <> 1 then
        Write-Debug loo_Rest.LastErrorText
    else
        Write-Debug ls_ErrResponse
    end if

    destroy loo_Rest
    return
end if

// Create an object for decrypting.
// This example will use "none" for the encryption algorithm, which means it's just a pass-through.
// Typically you would set the decrypt properties, such as secret key, IV, key length, padding scheme, cipher mode..
loo_Crypt = create oleobject
// Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")

loo_Crypt.CryptAlgorithm = "none"

// The following settings are ignored in this test because our CryptAlgorithm is "none".
// However, if you were truly decrypting, you might set CryptAlgorithm = "aes".
loo_Crypt.CipherMode = "cbc"
loo_Crypt.KeyLength = 128
loo_Crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex")
loo_Crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex")

loo_ReceiveStream = create oleobject
// Use "Chilkat_9_5_0.Stream" for versions of Chilkat < 10.0.0
li_rc = loo_ReceiveStream.ConnectToNewObject("Chilkat.Stream")

// The decryptStream's source will be the receiveStream.
loo_DecryptStream = create oleobject
// Use "Chilkat_9_5_0.Stream" for versions of Chilkat < 10.0.0
li_rc = loo_DecryptStream.ConnectToNewObject("Chilkat.Stream")

// The decrypt stream's sink will be a file.
loo_DecryptStream.SinkFile = "qa_output/chilkat-9.5.0-python-3.8-x64.zip"
loo_DecryptStream.SetSourceStream(loo_ReceiveStream)

// Create and run a background async task to decrypt incoming data and write to a file.
loo_DecryptStreamTask = loo_Crypt.DecryptStreamAsync(loo_DecryptStream)
li_Success = loo_DecryptStreamTask.Run()

li_Success = loo_Rest.ReadRespBodyStream(loo_ReceiveStream,1)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    destroy loo_Crypt
    destroy loo_ReceiveStream
    destroy loo_DecryptStream
    return
end if

Write-Debug "Successfully received the .zip file."


destroy loo_Rest
destroy loo_Crypt
destroy loo_ReceiveStream
destroy loo_DecryptStream