(CkPython) Streaming Decrypt HTTP Response

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

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import sys
import chilkat

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

rest = chilkat.CkRest()

bTls = True
port = 443
bAutoReconnect = True
success = rest.Connect("chilkatdownload.com",port,bTls,bAutoReconnect)

# Send the request to download a file.
success = rest.SendReqNoBody("GET","/9.5.0.83/chilkat-9.5.0-python-3.8-x64.zip")
if (success != True):
    print(rest.lastErrorText())
    sys.exit()

# Read the response header.
responseStatusCode = rest.ReadResponseHeader()
if (responseStatusCode < 0):
    print(rest.lastErrorText())
    sys.exit()

print("Response status code = " + str(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 (responseStatusCode != 200):
    errResponse = rest.readRespBodyString()
    if (rest.get_LastMethodSuccess() != True):
        print(rest.lastErrorText())
    else:
        print(errResponse)

    sys.exit()

# 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..
crypt = chilkat.CkCrypt2()
crypt.put_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".
crypt.put_CipherMode("cbc")
crypt.put_KeyLength(128)
crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex")
crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex")

receiveStream = chilkat.CkStream()
# The decryptStream's source will be the receiveStream.
decryptStream = chilkat.CkStream()

# The decrypt stream's sink will be a file.
decryptStream.put_SinkFile("qa_output/chilkat-9.5.0-python-3.8-x64.zip")
decryptStream.SetSourceStream(receiveStream)

# Create and run a background async task to decrypt incoming data and write to a file.
# decryptStreamTask is a CkTask
decryptStreamTask = crypt.DecryptStreamAsync(decryptStream)
success = decryptStreamTask.Run()

success = rest.ReadRespBodyStream(receiveStream,True)
if (success != True):
    print(rest.lastErrorText())
    sys.exit()

print("Successfully received the .zip file.")