(Swift 3,4,5...) How to Generate an Azure Service Bus Shared Access Signature (SAS)

Demonstrates generating and using an Azure Service Bus Shared Access Signature (SAS).

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

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func chilkatTest() {
    // Note: Requires Chilkat v9.5.0.65 or greater.

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

    // -------------------------------------------------------------------
    // Create a Shared Access Signature (SAS) token for Azure Service Bus.
    // -------------------------------------------------------------------

    let authSas = CkoAuthAzureSAS()!
    authSas.accessKey = "AzureServiceBus_PrimaryKey"

    // The SAS token for Service Bus will look like this:
    // (The order of params will be different.  The order does not matter.)
    // sig=<signature-string>&se=<expiry>&skn=<keyName>&sr=<URL-encoded-resourceURI>

    // Specify the format of the string to sign.
    authSas.stringToSign = "resourceURI,expiry"

    // Create an expiry to 30 days in the future.
    let dtExpiry = CkoDateTime()!
    dtExpiry.setFromCurrentSystemTime()
    dtExpiry.addDays(30)
    authSas.setTokenParam("expiry", authParamName: "se", value: dtExpiry.getAsUnixTimeStr(true))

    // Set the skn (keyname)
    // This example uses the key "RootManageSharedAccessKey".  This give full access.
    // In a typical scenario, you would create a new Azure key (for the service bus)
    // in the Azure portal, such that the key has limited permissions.  This would
    // allow you to give the SAS token to others for specific access for some period of time.
    authSas.setTokenParam("keyName", authParamName: "skn", value: "RootManageSharedAccessKey")

    // Set the URL-encoded-resourceURI
    let sbResourceUri = CkoStringBuilder()!
    sbResourceUri.append("https://<yournamespace>.servicebus.windows.net/")
    sbResourceUri.encode("url", charset: "utf-8")
    authSas.setTokenParam("resourceURI", authParamName: "sr", value: sbResourceUri.getAsString())

    // Generate the SAS token.
    var sasToken: String? = authSas.generateToken()
    if authSas.lastMethodSuccess != true {
        print("\(authSas.lastErrorText!)")
        return
    }

    print("SAS token: \(sasToken!)")

    // Save the SAS token to a file.
    // We can then use this pre-generated token for future Service Bus operations.
    let fac = CkoFileAccess()!
    fac.writeEntireTextFile("qa_data/tokens/serviceBusSas.txt", fileData: sasToken, charset: "utf-8", includePreamble: false)

}