# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*-
# vi: set ft=python sts=4 ts=4 sw=4 noet :

# This file is part of Fail2Ban.
#
# Fail2Ban 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 2 of the License, or
# (at your option) any later version.
#
# Fail2Ban 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 Fail2Ban; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

# Fail2Ban developers

__copyright__ = "Copyright (c) 2013 Steven Hiscocks"
__license__ = "GPL"

import unittest, sys, os, fileinput, re, datetime, inspect
from ConfigParser import InterpolationMissingOptionError

if sys.version_info >= (2, 6):
	import json
else:
	import simplejson as json
	next = lambda x: x.next()

from server.filter import Filter
from client.filterreader import FilterReader

TEST_FILES_DIR = os.path.join(os.path.dirname(__file__), "files")
CONFIG_DIR = "config"

class FilterSamplesRegex(unittest.TestCase):

	def setUp(self):
		"""Call before every test case."""
		self.filter = Filter(None)
		self.filter.setActive(True)

	def tearDown(self):
		"""Call after every test case."""

	def testFiltersPresent(self):
		"""Check to ensure some tests exist"""
		self.assertTrue(
			len([test for test in inspect.getmembers(self)
				if test[0].startswith('testSampleRegexs')])
			>= 10,
			"Expected more FilterSampleRegexs tests")

def testSampleRegexsFactory(name):
	def testFilter(self):

		# Check filter exists
		filterConf = FilterReader(name, "jail", basedir=CONFIG_DIR)
		filterConf.read()
		try:
			filterConf.getOptions({})
		except InterpolationMissingOptionError:
			# some filters like selinux aren't complete
			return

		for opt in filterConf.convert():
			if opt[2] == "addfailregex":
				self.filter.addFailRegex(opt[3])
			elif opt[2] == "addignoreregex":
				self.filter.addIgnoreRegex(opt[3])

		if not self.filter.getFailRegex():
			# No fail regexs set: likely just common file for includes.
			return

		self.assertTrue(
			os.path.isfile(os.path.join(TEST_FILES_DIR, "logs", name)),
			"No sample log file available for '%s' filter" % name)

		logFile = fileinput.FileInput(
			os.path.join(TEST_FILES_DIR, "logs", name))

		regexsUsed = set()
		for line in logFile:
			jsonREMatch = re.match("^# ?failJSON:(.+)$", line)
			if jsonREMatch:
				try:
					faildata = json.loads(jsonREMatch.group(1))
				except ValueError, e:
					raise ValueError("%s: %s:%i" %
						(e, logFile.filename(), logFile.filelineno()))
				line = next(logFile)
			elif line.startswith("#") or not line.strip():
				continue
			else:
				faildata = {}

			ret = self.filter.processLine(
				line, returnRawHost=True, checkAllRegex=True)
			if not ret:
				# Check line is flagged as none match
				self.assertFalse(faildata.get('match', True),
					 "Line not matched when should have: %s:%i %r" %
					(logFile.filename(), logFile.filelineno(), line))
			elif ret:
				# Check line is flagged to match
				self.assertTrue(faildata.get('match', False),
					"Line matched when shouldn't have: %s:%i %r" %
					(logFile.filename(), logFile.filelineno(), line))
				self.assertEqual(len(ret), 1, "Multiple regexs matched %r - %s:%i" %
								 (map(lambda x: x[0], ret),logFile.filename(), logFile.filelineno()))

				# Verify timestamp and host as expected
				failregex, host, time = ret[0]
				self.assertEqual(host, faildata.get("host", None))
				fail2banTime = datetime.datetime.fromtimestamp(time)
				jsonTime = datetime.datetime.strptime(
							faildata.get("time", None), "%Y-%m-%dT%H:%M:%S")
				
				self.assertEqual(fail2banTime, jsonTime,
					"Time  mismatch %s != %s on: %s:%i %r:" % 
					(fail2banTime, jsonTime, logFile.filename(), logFile.filelineno(), line ) )

				regexsUsed.add(failregex)

		# TODO: Remove exception handling once all regexs have samples
		for failRegexIndex, failRegex in enumerate(self.filter.getFailRegex()):
			self.assertTrue(
				failRegexIndex in regexsUsed,
				"Regex for filter '%s' has no samples: %i: %r" %
					(name, failRegexIndex, failRegex))

	return testFilter

for filter_ in os.listdir(os.path.join(CONFIG_DIR, "filter.d")):
	filterName = filter_.rpartition(".")[0]
	setattr(
		FilterSamplesRegex,
		"testSampleRegexs%s" % filterName.upper(),
		testSampleRegexsFactory(filterName))