from micropub import error
from .models import IndieAuthCode, Token


def auth(request) -> Token:
    if "HTTP_AUTHORIZATION" in request.META:
        auth = request.META.get("HTTP_AUTHORIZATION").split(" ")
        if auth[0] != "Bearer":
            raise error.bad_req("auth type {0} not supported".format(auth[0]))
        if len(auth) != 2:
            raise error.bad_req("invalid Bearer auth format, must be Bearer <token>")
        token = auth[1]
    elif "access_token" in request.POST:
        token = request.POST.get("access_token")
    elif "access_token" in request.GET:
        token = request.GET.get("access_token")
    else:
        raise error.unauthorized()

    try:
        token = Token.objects.get(pk=token)
    except Token.DoesNotExist:
        raise error.forbidden()

    return token


def gen_auth_code(req):
    code = IndieAuthCode()
    code.user = req.user
    code.client_id = req.POST["client_id"]
    code.redirect_uri = req.POST["redirect_uri"]
    code.response_type = req.POST.get("response_type", "id")
    if "scope" in req.POST:
        code.scope = " ".join(req.POST.getlist("scope"))
    code.save()
    return code.id


def gen_token(code):
    tok = Token()
    tok.user = code.user
    tok.client_id = code.client_id
    tok.scope = code.scope
    tok.save()
    return tok.id