Swift Google Drive: Download a File (Stream to the Filesystem)

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Downloads the content of a file by ID. (In this example the file id = 1R_70heIyzIAu1_u0prXbYcaIiJRVkgBl) The file is streamed directly to the filesystem. Note: The alt=media query param must be used to download the file content (as opposed to the file metadata).

Documentation: https://developers.google.com/drive/v3/reference/files/get

func chilkatTest() {
    let rest = CkoRest()
    var success: Bool

    //   Provide a previously obtained OAuth2 access token.
    let oauth2 = CkoOAuth2()
    oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
    rest.SetAuthOAuth2(oauth2)

    success = rest.Connect("www.googleapis.com", port: 443, tls: true, autoReconnect: true)
    if success != true {
        print("\(rest.LastErrorText)")
        return
    }

    rest.AddQueryParam("includeTeamDriveItems", value: "true")
    rest.AddQueryParam("supportsTeamDrives", value: "true")
    rest.AddQueryParam("alt", value: "media")

    //  First send the HTTP request.
    success = rest.SendReqNoBody("GET", uriPath: "/drive/v3/files/1R_70heIyzIAu1_u0prXbYcaIiJRVkgBl")
    if success != true {
        print("\(rest.LastErrorText)")
        return
    }

    //  Read the response header.  If the response status code is success, stream to the file.
    //  Otherwise receive the error response text.
    var statusCode: Int = rest.ReadResponseHeader().integerValue
    if statusCode < 0 {
        print("\(rest.LastErrorText)")
        return
    }

    if statusCode != 200 {
        print("Received error response code: \(statusCode)")
        //  Read the error response body.
        let sbErrResponse = CkoStringBuilder()
        success = rest.ReadRespSb(sbErrResponse)
        if success != true {
            print("\(rest.LastErrorText)")
            return
        }

        print("Error response:\(sbErrResponse.GetAsString())")
        return
    }

    //  Stream the response body to the output file.
    let respBodyStream = CkoStream()
    respBodyStream.SinkFile = "/someDirectory/penguins.jpg"
    success = rest.ReadRespBodyStream(respBodyStream, autoSetStreamCharset: true)
    if success != true {
        print("\(rest.LastErrorText)")
        return
    }

    print("Example Completed.")

}