views.py

    if not request.user.is_staff:
        raise PermissionDenied(_("only staff may use this tool"))

    from paramiko import RSAKey
    key_class = RSAKey
    prv = key_class.generate(bits=2048)

    import six
    prv_bio = six.BytesIO()
    prv.write_private_key(prv_bio)

    prv_bio_read = six.BytesIO(prv_bio.getvalue())

    pub = key_class.from_private_key(prv_bio_read)

    pub_bio = six.BytesIO()
    pub_bio.write("%s %s relate-course-key" % (pub.get_name(), pub.get_base64()))

    return render(request, "course/keypair.html", {
        "public_key": prv_bio.getvalue().decode(),
        "private_key": pub_bio.getvalue().decode(),
        })

# }}}


# {{{ celery task monitoring

def monitor_task(request, task_id):
    from celery.result import AsyncResult
    async_res = AsyncResult(task_id)

    progress_percent = None
    progress_statement = None

    if async_res.state == "PROGRESS":
        meta = async_res.info
        current = meta["current"]
        total = meta["total"]
        if total > 0:
            progress_percent = 100 * (current / total)

        progress_statement = (
                _("%d out of %d items processed.")
                % (current, total))

    if async_res.state == "SUCCESS":
        if (isinstance(async_res.result, dict)
                and "message" in async_res.result):
            progress_statement = async_res.result["message"]

    traceback = None
    if request.user.is_staff and async_res.state == "FAILURE":
        traceback = async_res.traceback

    return render(request, "course/task-monitor.html", {
        "state": async_res.state,
        "progress_percent": progress_percent,
        "progress_statement": progress_statement,
        "traceback": traceback,
        })

# }}}


# vim: foldmethod=marker