(Swift 3,4,5...) Create an Azure Service SAS

Shows how to generate an Azure Service SAS.

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func chilkatTest() {
    // 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 Service (Blob, Queue, Table, or File)
    // -----------------------------------------------------------------------------------------------

    // See https://docs.microsoft.com/en-us/rest/api/storageservices/create-service-sas
    // for details.

    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. 

    // Version 2018-11-09 and later
    // 
    // Version 2018-11-09 adds support for the signed resource and signed blob snapshot time fields. 
    // These must be included in the string-to-sign. To construct the string-to-sign for Blob service resources, use the following format:
    // 
    // StringToSign = signedpermissions + "\n" +  
    //                signedstart + "\n" +  
    //                signedexpiry + "\n" +  
    //                canonicalizedresource + "\n" +  
    //                signedidentifier + "\n" +  
    //                signedIP + "\n" +  
    //                signedProtocol + "\n" +  
    //                signedversion + "\n" +  
    //                signedResource + "\n"
    //                signedSnapshotTime + "\n" +
    //                rscc + "\n" +  
    //                rscd + "\n" +  
    //                rsce + "\n" +  
    //                rscl + "\n" +  
    //                rsct  
    // 

    authSas.stringToSign = "signedpermissions,signedstart,signedexpiry,canonicalizedresource,signedidentifier,signedIP,signedProtocol,signedversion,signedResource,signedSnapshotTime,rscc,rscd,rsce,rscl,rsct"

    authSas.setTokenParam("signedpermissions", authParamName: "sp", value: "rw")

    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))

    // The canonicalizedresouce portion of the string is a canonical path to the signed resource. It must include the service name (blob, table, queue or file) for version
    // 2021-08-06 or later, the storage account name, and the resource name, and must be URL-decoded. Names of blobs must include the blobs container. Table names must be
    // lower-case. The following examples show how to construct the canonicalizedresource portion of the string, depending on the type of resource.
    // For example:
    // URL = https://chilkat.blob.core.windows.net/mycontainer/starfish.jpg
    // canonicalizedresource = "/blob/chilkat/mycontainer/starfish.jpg"  
    // IMPORTANT: See https://docs.microsoft.com/en-us/rest/api/storageservices/create-service-sas for all details..
    authSas.setNonTokenParam("canonicalizedresource", value: "/blob/chilkat/mycontainer/starfish.jpg")

    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: "2018-11-09")

    // Indicate that we are creating a service SAS that is limited to the blob resource.
    // (Specify b if the shared resource is a blob. This grants access to the content and metadata of the blob.
    //  Specify c if the shared resource is a container. This grants access to the content and metadata of any blob in the container, and to the list of blobs in the container. )
    authSas.setTokenParam("signedResource", authParamName: "sr", value: "b")

    // Note that we did not call SetTokenParam for "signedIP", "signedSnapshotTime", "rscc", and others.  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 Service 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/azureStorageServiceSas.txt", fileData: sasToken, charset: "utf-8", includePreamble: false)

}