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#!/usr/bin/env python2.7

#

# Builds a JSON DB containing all the rulesets, indexed by target.

# The JSON DB is used by the Firefox addon.

#

import locale

import json

import os

import sys

import collections

from lxml import etree

from ruleset_filenames_validate import validate_filenames

# Explicitly set locale so sorting order for filenames is consistent.

# This is important for deterministic builds.

# https://trac.torproject.org/projects/tor/ticket/11630#comment:20

# It's also helpful to ensure consistency for the lowercase check below.

locale.setlocale(locale.LC_ALL, 'C')

json_path = os.path.join(os.path.dirname(__file__), '../pkg/rulesets.json')

json_output = {

"rulesetStrings": [],

"targets": collections.defaultdict(list)

}

parser = etree.XMLParser(remove_blank_text=True)

# Precompile xpath expressions that get run repeatedly.

xpath_host = etree.XPath("/ruleset/target/@host")

xpath_ruleset = etree.XPath("/ruleset")

for fi in validate_filenames():

try:

tree = etree.parse(fi, parser)

except Exception as oops:

print("%s failed XML validity: %s\n" % (fi, oops))

sys.exit(1)

# Remove comments to save space.

etree.strip_tags(tree, etree.Comment)

targets = xpath_host(tree)

if not targets:

print('File %s has no targets' % fi)

sys.exit(1)

# Strip out the target tags. These aren't necessary in the DB because

# targets are looked up in the target table, which has a foreign key

# pointing into the ruleset table.

etree.strip_tags(tree, 'target')

etree.strip_tags(tree, 'test')

# Store the filename in the `f' attribute so "view source XML" for rules in

# FF version can find it.

xpath_ruleset(tree)[0].attrib["f"] = os.path.basename(fi).decode(encoding="UTF-8")

for target in targets:

# id is the current length of the rules list - i.e. the offset at which

# this rule will be added in the list.

json_output["targets"][target].append(len(json_output["rulesetStrings"]))

json_output["rulesetStrings"].append(etree.tostring(tree))

with open(json_path, 'w') as f:

f.write(json.dumps(json_output))