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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
import codecs
import encodings.idna
import re
import sys
from make_dafsa import words_to_bin, words_to_cxx
Processes a file containing effective TLD data. See the following URL for a
description of effective TLDs and of the file format that this script
processes (although for the latter you're better off just reading this file's
short source code).
def getEffectiveTLDs(path):
file =, "r", "UTF-8")
domains = set()
for line in file:
# line always contains a line terminator unless the file is empty
if len(line) == 0:
raise StopIteration
line = line.rstrip()
# comment, empty, or superfluous line for explicitness purposes
if line.startswith("//") or not line.strip():
line = re.split(r"[ \t\n]", line, 1)[0]
entry = EffectiveTLDEntry(line)
domain = entry.domain()
assert domain not in domains, "repeating domain %s makes no sense" % domain
yield entry
def _normalizeHostname(domain):
Normalizes the given domain, component by component. ASCII components are
lowercased, while non-ASCII components are processed using the ToASCII
def convertLabel(label):
if _isASCII(label):
return label.lower()
return encodings.idna.ToASCII(label).decode("utf-8")
return ".".join(map(convertLabel, domain.split(".")))
def _isASCII(s):
"True if s consists entirely of ASCII characters, false otherwise."
for c in s:
if ord(c) > 127:
return False
return True
class EffectiveTLDEntry:
Stores an entry in an effective-TLD name file.
_exception = False
_wild = False
def __init__(self, line):
Creates a TLD entry from a line of data, which must have been stripped of
the line ending.
if line.startswith("!"):
self._exception = True
domain = line[1:]
elif line.startswith("*."):
self._wild = True
domain = line[2:]
domain = line
self._domain = _normalizeHostname(domain)
def domain(self):
"The domain this represents."
return self._domain
def exception(self):
"True if this entry's domain denotes does not denote an effective TLD."
return self._exception
def wild(self):
"True if this entry represents a class of effective TLDs."
return self._wild
def main(output, effective_tld_filename, output_format="cxx"):
effective_tld_filename is the effective TLD file to parse.
based on the output format, either a C++ array of a binary representation
of a DAFSA representing the eTLD file is then printed to standard output
or a binary file is written to disk.
def typeEnum(etld):
Maps the flags to the DAFSA's enum types.
if etld.exception():
return 1
elif etld.wild():
return 2
return 0
def dafsa_words():
make_dafsa expects lines of the form "<domain_name><enum_value>"
for etld in getEffectiveTLDs(effective_tld_filename):
yield "%s%d" % (etld.domain(), typeEnum(etld))
""" words_to_bin() returns a bytes while words_to_cxx() returns string """
if output_format == "bin":
if __name__ == "__main__":
This program can output the DAFSA in two formats:
as C++ code that will be included and compiled at build time
or as a binary file that will be published in Remote Settings.
Flags for format options:
"cxx" -> C++ array [default]
"bin" -> Binary file
output_format = "bin" if "--bin" in sys.argv else "cxx"
main(sys.stdout, sys.argv[1], output_format=output_format)