# urllibcompat.py - adapters to ease using urllib2 on Py2 and urllib on Py3

#

# Copyright 2017 Google, Inc.

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

import http.server

import urllib.error

import urllib.parse

import urllib.request

import urllib.response

from .pycompat import getattr

from . import pycompat

_sysstr = pycompat.sysstr

class _pycompatstub:

    def __init__(self):

        self._aliases = {}

    def _registeraliases(self, origin, items):

        """Add items that will be populated at the first access"""

        items = map(_sysstr, items)

        self._aliases.update(

            (item.replace('_', '').lower(), (origin, item)) for item in items

        )

    def _registeralias(self, origin, attr, name):

        """Alias ``origin``.``attr`` as ``name``"""

        self._aliases[_sysstr(name)] = (origin, _sysstr(attr))

    def __getattr__(self, name):

        try:

            origin, item = self._aliases[name]

        except KeyError:

            raise AttributeError(name)

        self.__dict__[name] = obj = getattr(origin, item)

        return obj

httpserver = _pycompatstub()

urlreq = _pycompatstub()

urlerr = _pycompatstub()

urlreq._registeraliases(

    urllib.parse,

    (

        b"splitattr",

        b"splitpasswd",

        b"splitport",

        b"splituser",

        b"urlparse",

        b"urlunparse",

    ),

)

urlreq._registeralias(urllib.parse, b"parse_qs", b"parseqs")

urlreq._registeralias(urllib.parse, b"parse_qsl", b"parseqsl")

urlreq._registeralias(urllib.parse, b"unquote_to_bytes", b"unquote")

urlreq._registeraliases(

    urllib.request,

    (

        b"AbstractHTTPHandler",

        b"BaseHandler",

        b"build_opener",

        b"FileHandler",

        b"FTPHandler",

        b"ftpwrapper",

        b"HTTPHandler",

        b"HTTPSHandler",

        b"install_opener",

        b"pathname2url",

        b"HTTPBasicAuthHandler",

        b"HTTPDigestAuthHandler",

        b"HTTPPasswordMgrWithDefaultRealm",

        b"ProxyHandler",

        b"Request",

        b"url2pathname",

        b"urlopen",

    ),

)

urlreq._registeraliases(

    urllib.response,

    (

        b"addclosehook",

        b"addinfourl",

    ),

)

urlerr._registeraliases(

    urllib.error,

    (

        b"HTTPError",

        b"URLError",

    ),

)

httpserver._registeraliases(

    http.server,

    (

        b"HTTPServer",

        b"BaseHTTPRequestHandler",

        b"SimpleHTTPRequestHandler",

        b"CGIHTTPRequestHandler",

    ),

)

# urllib.parse.quote() accepts both str and bytes, decodes bytes

# (if necessary), and returns str. This is wonky. We provide a custom

# implementation that only accepts bytes and emits bytes.

def quote(s, safe='/'):

    # bytestr has an __iter__ that emits characters. quote_from_bytes()

    # does an iteration and expects ints. We coerce to bytes to appease it.

    if isinstance(s, pycompat.bytestr):

        s = bytes(s)

    s = urllib.parse.quote_from_bytes(s, safe=safe)

    return s.encode('ascii', 'strict')

# urllib.parse.urlencode() returns str. We use this function to make

# sure we return bytes.

def urlencode(query, doseq=False):

    s = urllib.parse.urlencode(query, doseq=doseq)

    return s.encode('ascii')

urlreq.quote = quote

urlreq.urlencode = urlencode

def getfullurl(req):

    return req.full_url

def gethost(req):

    return req.host

def getselector(req):

    return req.selector

def getdata(req):

    return req.data

def hasdata(req):

    return req.data is not None