(Swift 2) Google Drive Multipart Upload String

Demonstrates a file upload to Google Drive where the contents of the file are contained in a string variable.

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func chilkatTest() {
    // This example will upload a file to Google Drive.
    var success: Bool = true

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

    let gAuth = CkoAuthGoogle()
    gAuth.Scope = "https://www.googleapis.com/auth/drive"
    gAuth.SubEmailAddress = "some.user@example.com"
    gAuth.ExpireNumSeconds = 3600

    // Obtain an access token as shown in one of the following examples:
    // See Get Access Token using a Service Account JSON Key
    // See Get Access Token using a P12 File

    let rest = CkoRest()

    // Connect using TLS.
    var bAutoReconnect: Bool = true
    success = rest.Connect("www.googleapis.com", port: 443, tls: true, autoReconnect: bAutoReconnect)

    // Provide the authentication credentials (i.e. the access key)
    success = rest.SetAuthGoogle(gAuth)

    // A multipart upload to Google Drive needs a multipart/related Content-Type
    success = rest.AddHeader("Content-Type", value: "multipart/related")

    // Specify each part of the request.

    // The 1st part is JSON with information about the file.
    rest.PartSelector = "1"
    success = rest.AddHeader("Content-Type", value: "application/json; charset=UTF-8")

    let json = CkoJsonObject()
    success = json.AddStringAt(-1, name: "title", value: "helloWorld.txt")
    success = json.AddStringAt(-1, name: "description", value: "A simple text file that says Hello World.")
    success = json.AddStringAt(-1, name: "mimeType", value: "text/plain")
    success = rest.SetMultipartBodyString(json.Emit())

    // The 2nd part is the file content.
    // In this case, we'll upload a simple text file containing "Hello World!"
    rest.PartSelector = "2"
    success = rest.AddHeader("Content-Type", value: "text/plain")
    success = rest.SetMultipartBodyString("Hello World!")

    // POST https://www.googleapis.com/upload/drive/v2/files
    var jsonResponse: String? = rest.FullRequestMultipart("POST", uriPath: "/upload/drive/v2/files?uploadType=multipart")
    if rest.LastMethodSuccess != true {
        print("\(rest.LastErrorText)")
        return
    }

    // Show the JSON response.
    print("Response Status Code: \(rest.ResponseStatusCode.intValue)")
    print("Json Response: \(jsonResponse!)")

}