Limnoria/src/webutils.py

#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

__revision__ = "$Id$"

import supybot.fix as fix

import re
import socket
import urllib2
import urlparse

import supybot.conf as conf

Request = urllib2.Request
class WebError(Exception):
    pass

urlRe = re.compile(r"(\w+://[^\])>\s]+)", re.I)

REFUSED = 'Connection refused.'
TIMED_OUT = 'Connection timed out.'
UNKNOWN_HOST = 'Unknown host.'
RESET_BY_PEER = 'Connection reset by peer.'
FORBIDDEN = 'Client forbidden from accessing URL.'

def strError(e):
    try:
        n = e.args[0]
    except Exception:
        return str(e)
    if n == 111:
        return REFUSED
    elif n in (110, 10060):
        return TIMED_OUT
    elif n == 104:
        return RESET_BY_PEER
    elif n == 8:
        return UNKNOWN_HOST
    elif n == 403:
        return FORBIDDEN
    else:
        return str(e)

def getUrlFd(url):
    """Gets a file-like object for a url."""
    try:
        if not isinstance(url, urllib2.Request):
            if '#' in url:
                url = url[:url.index('#')]
            request = urllib2.Request(url)
        else:
            request = url
        httpProxy = conf.supybot.protocols.http.proxy()
        if httpProxy:
            request.set_proxy(httpProxy, 'http')
        fd = urllib2.urlopen(request)
        return fd
    except socket.timeout, e:
        raise WebError, TIMED_OUT
    except socket.error, e:
        raise WebError, strError(e)
    except urllib2.URLError, e:
        raise WebError, strError(e.reason[1])
    except urllib2.HTTPError, e:
        raise WebError, strError(e)

def getUrl(url, size=None):
    """Gets a page.  Returns a string that is the page gotten."""
    fd = getUrlFd(url)
    try:
        if size is None:
            text = fd.read()
        else:
            text = fd.read(size)
    except socket.timeout, e:
        raise WebError, TIMED_OUT
    fd.close()
    return text

def getDomain(url):
    return urlparse.urlparse(url)[1]


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