CkPython Requires Chilkat v11.0.0+

Walmart Partner API Authentication (Generate a Signature for a Request)

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Demonstrates how to generate a signature for a Walmart Partner REST API call. CkPython

import sys
import chilkat

success = False

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

consumerId = "b68d2a72...."
baseUrl = "https://marketplace.walmartapis.com/v2/feeds"
#  This is your Base64 encoded private key
privateEncodedStr = "MIICeAIBADANBgkqhkiG9w0BAQEFAA......"
httpMethod = "GET"

#  We need a timestamp in decimal string form representing the number of milliseconds since Jan 01 1970 UTC.
dt = chilkat.CkDateTime()
#  Set bLocal = True for a timestamp in the local timezone.  Set bLocal = False for a UTC timestamp.
bLocal = False
#  This gets the timestamp in seconds, not milliseconds.
timeStampVal = dt.GetAsUnixTime(bLocal)

#  Build the string to sign.
sbStringToSign = chilkat.CkStringBuilder()
sbStringToSign.Append(consumerId)
sbStringToSign.Append("\n")
sbStringToSign.Append(baseUrl)
sbStringToSign.Append("\n")
sbStringToSign.Append(httpMethod)
sbStringToSign.Append("\n")
sbStringToSign.AppendInt(timeStampVal)
#  We add three zero's so that the timestamp value is in milliseconds.
#  We don't care about accuracy down to less than a second.
#  All the server cares about is that the request was signed at the current date/time
#  within some reasonable margin of error (to account for systems having clocks
#  that may be slightly different).
sbStringToSign.Append("000\n")

privKey = chilkat.CkPrivateKey()
#  Load the private key into a private key object.
#  Note: Technically the private key is not PEM because it lacks the header/footer strings
#  used for PEM.  However, the LoadPem method will still accept it and load it correctly.
success = privKey.LoadPem(privateEncodedStr)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

rsa = chilkat.CkRsa()
success = rsa.UsePrivateKey(privKey)
if (success == False):
    print(rsa.lastErrorText())
    sys.exit()

#  We want a base64 signature string.
rsa.put_EncodingMode("base64")

signatureString = rsa.signStringENC(sbStringToSign.getAsString(),"SHA256")
if (rsa.get_LastMethodSuccess() == False):
    print(rsa.lastErrorText())
    sys.exit()

print("Signature String: " + signatureString)