# -*- coding: utf-8 -*-
#
# Copyright Grégory Soutadé 2015

# This file is part of iwla

# iwla is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# iwla is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with iwla.  If not, see <http://www.gnu.org/licenses/>.
#

import re

from iwla import IWLA
from iplugin import IPlugin

import awstats_data

"""
Pre analysis hook

Filter robots

Plugin requirements :
    None

Conf values needed :
    page_to_hit_conf*
    hit_to_page_conf*

Output files :
    None

Statistics creation :
    None

Statistics update :
visits :
   remote_addr =>
       robot

Statistics deletion :
    None
"""

class IWLAPreAnalysisRobots(IPlugin):
    def __init__(self, iwla):
        super(IWLAPreAnalysisRobots, self).__init__(iwla)
        self.API_VERSION = 1

    def load(self):
        self.awstats_robots = map(lambda (x) : re.compile(('.*%s.*') % (x), re.IGNORECASE), awstats_data.robots)
        self.robot_re = re.compile(r'.*bot.*', re.IGNORECASE)
        self.crawl_re = re.compile(r'.*crawl.*', re.IGNORECASE)
        return True

# Basic rule to detect robots
    def hook(self):
        hits = self.iwla.getCurrentVisists()
        for (k, super_hit) in hits.items():
            if super_hit['robot']: continue

            isRobot = False
            referers = 0

            first_page = super_hit['requests'][0]

            if self.robot_re.match(first_page['http_user_agent']) or\
                    self.crawl_re.match(first_page['http_user_agent']):
                super_hit['robot'] = 1
                continue

            for r in self.awstats_robots:
                if r.match(first_page['http_user_agent']):
                    isRobot = True
                    break

            if isRobot:
                super_hit['robot'] = 1
                continue

# 1) no pages view --> robot
            # if not super_hit['viewed_pages']:
            #     super_hit['robot'] = 1
            #     continue

# 2) pages without hit --> robot
            if not super_hit['viewed_hits']:
                super_hit['robot'] = 1
                continue

            for hit in super_hit['requests']:
# 3) /robots.txt read
                if hit['extract_request']['http_uri'] == '/robots.txt':
                    isRobot = True
                    break

# 4) Any referer for hits
                if not hit['is_page'] and hit['http_referer']:
                    referers += 1

            if isRobot:
                super_hit['robot'] = 1
                continue

            if not super_hit['viewed_pages'] and \
                    (super_hit['viewed_hits'] and not referers):
                super_hit['robot'] = 1
                continue