Swift

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. Swift

func chilkatTest() {
    var success: Bool = false

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

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

    // We need a timestamp in decimal string form representing the number of milliseconds since Jan 01 1970 UTC.
    let dt = CkoDateTime()!
    // Set bLocal = true for a timestamp in the local timezone.  Set bLocal = false for a UTC timestamp.
    var bLocal: Bool = false
    // This gets the timestamp in seconds, not milliseconds.
    var timeStampVal: Int = dt.get(asUnixTime: bLocal)

    // Build the string to sign.
    let sbStringToSign = CkoStringBuilder()!
    sbStringToSign.append(value: consumerId)
    sbStringToSign.append(value: "\n")
    sbStringToSign.append(value: baseUrl)
    sbStringToSign.append(value: "\n")
    sbStringToSign.append(value: httpMethod)
    sbStringToSign.append(value: "\n")
    sbStringToSign.appendInt(value: 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(value: "000\n")

    let privKey = CkoPrivateKey()!
    // 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(str: privateEncodedStr)
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    let rsa = CkoRsa()!
    success = rsa.usePrivateKey(privKey: privKey)
    if success == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    // We want a base64 signature string.
    rsa.encodingMode = "base64"

    var signatureString: String? = rsa.signStringENC(str: sbStringToSign.getAsString(), hashAlg: "SHA256")
    if rsa.lastMethodSuccess == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    print("Signature String: \(signatureString!)")

}