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

Shows how to generate a Shared Access Signature (SAS) for an Azure Storage Account.

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 an Azure Storage Account.
    // --------------------------------------------------------------------------

    // See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/constructing-an-account-sas 
    // for details regarding the Azure Storage Account SAS fields.

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

    // Specify the format of the string to sign.
    // Each comma character in the following string represents a LF ("\n") character.
    // The names specified in the StringToSign are replaced with the values specified
    // in the subsequent calls to SetTokenParam and SetNonTokenParam,.

    // Note: The trailing comma in the StringToSign is intentional and important. This indicates that the 
    // string to sign will end with a "\n".

    // Also note: The names in the StringToSign are case sensitive.  The names
    // specified in the 1st argument in the calls to SetNonTokenParam and SetTokenParam should
    // match a name listed in StringToSign. 
    authSas.stringToSign = "accountname,signedpermissions,signedservice,signedresourcetype,signedstart,signedexpiry,signedIP,signedProtocol,signedversion,"

    //  The account name is "chilkat".  Use your own account name instead of "chilkat".
    //  Also use your own container name instead of "mycontainer".
    authSas.setNonTokenParam("accountname", value: "chilkat")

    authSas.setTokenParam("signedpermissions", authParamName: "sp", value: "rwdlacup")
    authSas.setTokenParam("signedservice", authParamName: "ss", value: "bfqt")
    authSas.setTokenParam("signedresourcetype", authParamName: "srt", value: "sco")

    let dt = CkoDateTime()!
    dt.setFromCurrentSystemTime()
    authSas.setTokenParam("signedstart", authParamName: "st", value: dt.getAsIso8601("YYYY-MM-DDThh:mmTZD", bLocal: false))

    // This SAS token will be valid for 30 days.
    dt.addDays(30)
    authSas.setTokenParam("signedexpiry", authParamName: "se", value: dt.getAsIso8601("YYYY-MM-DDThh:mmTZD", bLocal: false))

    authSas.setTokenParam("signedProtocol", authParamName: "spr", value: "https")

    //  Specifiy values and query param names for each field.
    //  If a field is not specified, then an empty string will be used for its value.
    authSas.setTokenParam("signedversion", authParamName: "sv", value: "2015-04-05")

    // Note that we did not call SetTokenParam for "signedIP".  For any omitted fields
    // the value will default to the empty string.

    // 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 Azure Storage Account operations.
    let fac = CkoFileAccess()!
    fac.writeEntireTextFile("qa_data/tokens/azureStorageAccountSas.txt", fileData: sasToken, charset: "utf-8", includePreamble: false)

}