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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#VERSION: 1.31

# Author:
#  Christophe DUMEZ (chris@qbittorrent.org)

import re, htmlentitydefs
import tempfile
import os
import StringIO, gzip, urllib2
import socket
import socks
import re

# SOCKS5 Proxy support
if os.environ.has_key("sock_proxy") and len(os.environ["sock_proxy"].strip()) > 0:
    proxy_str = os.environ["sock_proxy"].strip()
    m=re.match(r"^(?:(?P<username>[^:]+):(?P<password>[^@]+)@)?(?P<host>[^:]+):(?P<port>\w+)$", proxy_str)
    if m is not None:
        socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, m.group('host'), int(m.group('port')), True, m.group('username'), m.group('password'))
        socket.socket = socks.socksocket

def htmlentitydecode(s):
    # First convert alpha entities (such as &eacute;)
    # (Inspired from http://mail.python.org/pipermail/python-list/2007-June/443813.html)
    def entity2char(m):
        entity = m.group(1)
        if entity in htmlentitydefs.name2codepoint:
            return unichr(htmlentitydefs.name2codepoint[entity])
        return u" "  # Unknown entity: We replace with a space.
    t = re.sub(u'&(%s);' % u'|'.join(htmlentitydefs.name2codepoint), entity2char, s)
  
    # Then convert numerical entities (such as &#233;)
    t = re.sub(u'&#(\d+);', lambda x: unichr(int(x.group(1))), t)
   
    # Then convert hexa entities (such as &#x00E9;)
    return re.sub(u'&#x(\w+);', lambda x: unichr(int(x.group(1),16)), t)
    
def retrieve_url(url):
    """ Return the content of the url page as a string """
    req = urllib2.Request(url)
    response = urllib2.urlopen(req)
    dat = response.read()
    info = response.info()
    charset = 'utf-8'
    try:
        ignore, charset = info['Content-Type'].split('charset=')
    except:
        pass
    dat = dat.decode(charset, 'replace')
    dat = htmlentitydecode(dat)
    return dat.encode('utf-8', 'replace')

def download_file(url, referer=None):
    """ Download file at url and write it to a file, return the path to the file and the url """
    file, path = tempfile.mkstemp()
    file = os.fdopen(file, "w")
    # Download url
    req = urllib2.Request(url)
    if referer is not None:
        req.add_header('referer', referer)
    response = urllib2.urlopen(req)
    dat = response.read()
    # Check if it is gzipped
    if dat[:2] == '\037\213':
        # Data is gzip encoded, decode it
        compressedstream = StringIO.StringIO(dat)
        gzipper = gzip.GzipFile(fileobj=compressedstream)
        extracted_data = gzipper.read()
        dat = extracted_data
        
    # Write it to a file
    file.write(dat)
    file.close()
    # return file path
    return path+" "+url
