647 lines
24 KiB
Python
647 lines
24 KiB
Python
#!/usr/bin/env python3.6
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#
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# Copyright (C) 2016,2017 The University of Sheffield, UK
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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"""
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Module for handling archives of the Browser Extension Crawler.
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"""
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import os
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import glob
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import re
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import json
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from concurrent.futures import TimeoutError
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from pebble import ProcessPool, ProcessExpired
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from functools import partial
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import shutil
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import tempfile
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import time
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import traceback
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import tarfile
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import datetime
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import dateutil
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import dateutil.parser
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import requests
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from ExtensionCrawler.config import (
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const_review_payload, const_review_search_url, const_download_url,
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get_local_archive_dir, const_overview_url, const_support_url,
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const_support_payload, const_review_search_payload, const_review_url)
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from ExtensionCrawler.util import google_dos_protection, value_of, log_info, log_warning, log_exception, setup_logger
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from ExtensionCrawler.db import update_db_incremental
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class Error(Exception):
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pass
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class CrawlError(Error):
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def __init__(self, extid="", message="", pagecontent=""):
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self.extid = extid
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self.message = message
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self.pagecontent = pagecontent
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super(CrawlError, self).__init__()
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class RequestResult:
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def __init__(self, response=None, exception=None):
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if response is not None:
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self.http_status = response.status_code
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self.exception = exception
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def is_ok(self):
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return (self.exception is None) and (self.http_status == 200)
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def not_authorized(self):
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return (self.exception is None) and (self.http_status == 401)
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def not_found(self):
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return (self.exception is None) and (self.http_status == 404)
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def has_exception(self):
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return self.exception is not None
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def not_available(self):
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return (self.exception is None) and (self.http_status == 503)
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def not_modified(self):
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return (self.exception is None) and (self.http_status == 304)
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class UpdateResult:
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def __init__(self, ext_id, is_new, exception, res_overview, res_crx,
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res_reviews, res_support, res_sql, sql_update, worker_exception=None):
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self.ext_id = ext_id
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self.new = is_new
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self.exception = exception # TODO: should be tar_exception
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self.res_overview = res_overview
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self.res_crx = res_crx
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self.res_reviews = res_reviews
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self.res_support = res_support
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self.res_sql = res_sql
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self.sql_update = sql_update
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self.worker_exception = worker_exception
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def is_new(self):
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return self.new
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def is_ok(self):
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return ((self.worker_exception is None)
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and self.res_overview.is_ok()
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and (self.res_crx.is_ok() or self.res_crx.not_modified())
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and ((self.res_reviews is None) or self.res_reviews.is_ok())
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and ((self.res_support is None) or self.res_support.is_ok()))
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def not_authorized(self):
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return ((self.res_overview is not None and self.res_overview.not_authorized())
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or (self.res_crx is not None and self.res_crx.not_authorized())
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or (self.res_reviews is not None
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and self.res_reviews.not_authorized())
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or (self.res_support is not None
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and self.res_support.not_authorized()))
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def not_in_store(self):
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return ((self.res_overview is not None and self.res_overview.not_found())
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or (self.res_crx is not None and self.res_crx.not_found())
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or (self.res_reviews is not None and self.res_reviews.not_found())
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or (self.res_support is not None and self.res_support.not_found()))
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def has_exception(self):
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return ((self.res_overview is not None and self.res_overview.has_exception())
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or (self.res_crx is not None and self.res_crx.has_exception())
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or (self.res_reviews is not None
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and self.res_reviews.has_exception())
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or (self.res_support is not None
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and self.res_support.has_exception()))
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def raised_google_ddos(self):
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return ((self.res_reviews is not None
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and self.res_reviews.not_available())
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or (self.res_support is not None
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and self.res_support.not_available()))
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def not_modified(self):
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return self.res_crx is None or self.res_crx.not_modified()
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def corrupt_tar(self):
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return self.exception is not None
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def sql_exception(self):
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return self.res_sql is not None
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def sql_success(self):
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return self.sql_update
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def write_text(tardir, date, fname, text):
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directory = os.path.join(tardir, date)
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os.makedirs(directory, exist_ok=True)
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with open(os.path.join(directory, fname), 'w') as f:
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f.write(text)
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def store_request_metadata(tar, date, fname, request):
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write_text(tar, date, fname + ".headers", str(request.headers))
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write_text(tar, date, fname + ".status", str(request.status_code))
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write_text(tar, date, fname + ".url", str(request.url))
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def store_request_text(tar, date, fname, request):
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write_text(tar, date, fname, request.text)
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store_request_metadata(tar, date, fname, request)
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def httpdate(dt):
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weekday = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"][dt.weekday()]
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month = [
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"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
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"Nov", "Dec"
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][dt.month - 1]
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return "%s, %02d %s %04d %02d:%02d:%02d GMT" % (weekday, dt.day, month,
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dt.year, dt.hour,
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dt.minute, dt.second)
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def last_modified_utc_date(path):
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if path is "":
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return ""
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return os.path.split(os.path.dirname(path))[1]
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def last_modified_http_date(path):
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if path is "":
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return ""
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return httpdate(dateutil.parser.parse(last_modified_utc_date(path)))
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def last_crx(archivedir, extid, date=None):
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last_crx_path = ""
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last_crx_etag = ""
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etag_file = os.path.join(archivedir, get_local_archive_dir(extid),
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extid + ".etag")
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if date is None and os.path.exists(etag_file):
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try:
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with open(etag_file, 'r') as f:
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d = json.load(f)
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return d["last_crx"], d["last_crx_etag"]
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except Exception:
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log_exception("Something was wrong with the etag file {}, deleting it ...".format(etag_file))
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try:
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os.remove(etag_file)
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except Exception:
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log_exception("Could not remove etag file {}!".format(etag_file))
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# If we do not yet have an .etag file present, open the tarfile and look
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# there for one. After having done that once, the crawler creates the .etag
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# file to avoid opening the tar file in the future.
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tar = os.path.join(archivedir, get_local_archive_dir(extid),
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extid + ".tar")
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if os.path.exists(tar):
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with tarfile.open(tar, 'r') as t:
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old_crxs = sorted([
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x.name for x in t.getmembers()
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if x.name.endswith(".crx") and x.size > 0 and (
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date is None or (dateutil.parser.parse(
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os.path.split(os.path.split(x.name)[0])[1]) <= date))
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])
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if old_crxs:
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last_crx_path = old_crxs[-1]
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headers_content = t.extractfile(
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last_crx_path + ".headers").read().decode().replace(
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'"', '\\"').replace("'", '"')
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headers_json = json.loads(headers_content)
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last_crx_etag = headers_json["ETag"]
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if date is None:
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with open(etag_file, 'w') as f:
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json.dump({"last_crx": last_crx_path, "last_crx_etag": last_crx_etag}, f)
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return last_crx_path, last_crx_etag
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def first_crx(archivedir, extid, date=None):
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first_crx_path = ""
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tar = os.path.join(archivedir, get_local_archive_dir(extid),
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extid + ".tar")
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if os.path.exists(tar):
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t = tarfile.open(tar, 'r')
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old_crxs = sorted([
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x.name for x in t.getmembers()
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if x.name.endswith(".crx") and x.size > 0 and (
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date is None or (date <= dateutil.parser.parse(
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os.path.split(os.path.split(x.name)[0])[1])))
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])
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t.close()
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if old_crxs:
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first_crx_path = old_crxs[0]
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return first_crx_path
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def all_crx(archivedir, extid, date=None):
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tar = os.path.join(archivedir, get_local_archive_dir(extid),
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extid + ".tar")
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all_crxs = []
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if os.path.exists(tar):
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t = tarfile.open(tar, 'r')
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all_crxs = sorted([
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x.name for x in t.getmembers()
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if x.name.endswith(".crx") and x.size > 0
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])
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t.close()
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return all_crxs
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def update_overview(tar, date, ext_id):
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res = None
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try:
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res = requests.get(const_overview_url(ext_id), timeout=10)
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log_info("* overview page: {}".format(str(res.status_code)), 2, ext_id)
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store_request_text(tar, date, 'overview.html', res)
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except Exception as e:
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log_exception("Exception when retrieving overview page", 2, ext_id)
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write_text(tar, date, 'overview.html.exception',
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traceback.format_exc())
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return RequestResult(res, e)
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return RequestResult(res)
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def validate_crx_response(res, extid, extfilename):
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regex_extfilename = re.compile(r'^extension[_0-9]+\.crx$')
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if 'Content-Type' not in res.headers:
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raise CrawlError(extid, 'Did not find Content-Type header.', '\n'.join(
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res.iter_lines()))
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if not res.headers['Content-Type'] == 'application/x-chrome-extension':
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text = [line.decode('utf-8') for line in res.iter_lines()]
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raise CrawlError(
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extid,
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'Expected Content-Type header to be application/x-chrome-extension, but got {}.'.
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format(res.headers['Content-Type']), '\n'.join(text))
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if not regex_extfilename.match(extfilename):
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raise CrawlError(
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extid, '{} is not a valid extension file name, skipping...'.format(
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extfilename))
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def update_crx(archivedir, tmptardir, ext_id, date):
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res = None
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extfilename = "default_ext_archive.crx"
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last_crx_file, last_crx_etag = last_crx(archivedir, ext_id)
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last_crx_http_date = last_modified_http_date(last_crx_file)
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headers = ""
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if last_crx_file is not "":
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headers = {'If-Modified-Since': last_crx_http_date}
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try:
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log_info("* Checking If-Modified-Since", 2, ext_id)
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res = requests.get(
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const_download_url().format(ext_id),
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stream=True,
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headers=headers,
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timeout=10)
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log_info("* crx archive (Last: {}): {}".format(
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value_of(last_crx_http_date, "n/a"), str(res.status_code)), 2,
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ext_id)
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extfilename = os.path.basename(res.url)
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if re.search('&', extfilename):
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extfilename = "default.crx"
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if res.status_code == 304:
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etag = requests.head(
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const_download_url().format(ext_id),
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timeout=10,
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allow_redirects=True).headers.get('ETag')
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write_text(tmptardir, date, extfilename + ".etag", etag)
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log_info("- checking etag, last: {}".format(last_crx_etag), 3,
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ext_id)
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log_info(" current: {}".format(etag), 3, ext_id)
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if (etag is not "") and (etag != last_crx_etag):
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log_info("- downloading due to different etags", 3, ext_id)
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res = requests.get(
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const_download_url().format(ext_id),
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stream=True,
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timeout=10)
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else:
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write_text(tmptardir, date, extfilename + ".link",
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os.path.join("..",
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last_modified_utc_date(last_crx_file),
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extfilename) + "\n")
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store_request_metadata(tmptardir, date, extfilename, res)
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if res.status_code == 200:
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validate_crx_response(res, ext_id, extfilename)
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with open(os.path.join(tmptardir, date, extfilename), 'wb') as f:
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for chunk in res.iter_content(chunk_size=512 * 1024):
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if chunk: # filter out keep-alive new chunks
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f.write(chunk)
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write_text(tmptardir, date, extfilename + ".etag",
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res.headers.get("ETag"))
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etag_file = os.path.join(archivedir, get_local_archive_dir(ext_id), ext_id + ".etag")
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with open(etag_file, 'w') as f:
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json.dump({
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"last_crx": os.path.join(ext_id, date, extfilename),
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"last_crx_etag": res.headers.get("ETag")
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}, f)
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except Exception as e:
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log_exception("Exception when updating crx", 3, ext_id)
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write_text(tmptardir, date, extfilename + ".exception",
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traceback.format_exc())
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return RequestResult(res, e)
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return RequestResult(res)
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def iterate_authors(pages):
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for page in pages:
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json_page = json.loads(page[page.index("{\""):page.rindex("}}},") + 1])
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for annotation in json_page["annotations"]:
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if "attributes" in annotation:
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if "replyExists" in annotation["attributes"]:
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if annotation["attributes"]["replyExists"]:
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yield (annotation["entity"]["author"], annotation["entity"]["groups"])
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def update_reviews(tar, date, ext_id):
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res = None
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try:
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pages = []
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# google_dos_protection()
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res = requests.post(
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const_review_url(),
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data=const_review_payload(ext_id, "0", "100"),
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timeout=10)
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log_info("* review page 0-100: {}".format(str(res.status_code)), 2,
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ext_id)
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store_request_text(tar, date, 'reviews000-099.text', res)
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if res.status_code == 200:
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pages += [res.text]
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google_dos_protection()
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res = requests.post(
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const_review_url(),
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data=const_review_payload(ext_id, "100", "100"),
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timeout=10)
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log_info("* review page 100-200: {}".format(str(res.status_code)), 2,
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ext_id)
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store_request_text(tar, date, 'reviews100-199.text', res)
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if res.status_code == 200:
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pages += [res.text]
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google_dos_protection()
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# Always start with reply number 0 and request 10 replies
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ext_id_author_tups = [(ext_id, author, 0, 10, groups)
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for author, groups in iterate_authors(pages)]
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if ext_id_author_tups:
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res = requests.post(
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const_review_search_url(),
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data=const_review_search_payload(ext_id_author_tups),
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timeout=10)
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log_info("* review page replies: {}".format(str(res.status_code)),
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2, ext_id)
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store_request_text(tar, date, 'reviewsreplies.text', res)
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except Exception as e:
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log_exception("Exception when updating reviews", 2, ext_id)
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write_text(tar, date, 'reviews.html.exception', traceback.format_exc())
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return RequestResult(res, e)
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return RequestResult(res)
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def update_support(tar, date, ext_id):
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res = None
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try:
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pages = []
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google_dos_protection()
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res = requests.post(
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const_support_url(),
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data=const_support_payload(ext_id, "0", "100"),
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timeout=10)
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log_info("* support page 0-100: {}".format(str(res.status_code)), 2,
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ext_id)
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store_request_text(tar, date, 'support000-099.text', res)
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if res.status_code == 200:
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pages += [res.text]
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google_dos_protection()
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res = requests.post(
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const_support_url(),
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data=const_support_payload(ext_id, "100", "100"),
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timeout=10)
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log_info("* support page 100-200: {}".format(str(res.status_code)), 2,
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ext_id)
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store_request_text(tar, date, 'support100-199.text', res)
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if res.status_code == 200:
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pages += [res.text]
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google_dos_protection()
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# Always start with reply number 0 and request 10 replies
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ext_id_author_tups = [(ext_id, author, 0, 10, groups)
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for author, groups in iterate_authors(pages)]
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if ext_id_author_tups:
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res = requests.post(
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const_review_search_url(),
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data=const_review_search_payload(ext_id_author_tups),
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timeout=10)
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log_info("* support page replies: {}".format(str(res.status_code)),
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2, ext_id)
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store_request_text(tar, date, 'supportreplies.text', res)
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except Exception as e:
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log_exception("Exception when updating support pages", 2, ext_id)
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write_text(tar, date, 'support.html.exception', traceback.format_exc())
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return RequestResult(res, e)
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return RequestResult(res)
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def update_extension(archivedir, forums, ext_id):
|
|
log_info("Updating extension {}".format(" (including forums)"
|
|
if forums else ""), 1, ext_id)
|
|
is_new = False
|
|
tar_exception = None
|
|
sql_exception = None
|
|
sql_success = False
|
|
tmptardir = ""
|
|
start = time.time()
|
|
|
|
date = datetime.datetime.now(datetime.timezone.utc).isoformat()
|
|
|
|
tardir = os.path.join(archivedir, get_local_archive_dir(ext_id), ext_id)
|
|
tar = (tardir + ".tar")
|
|
|
|
try:
|
|
tmpdir = tempfile.mkdtemp()
|
|
tmptardir = os.path.join(tmpdir, ext_id)
|
|
log_info("* tmptardir = {}".format(tmptardir), 2, ext_id)
|
|
os.makedirs(
|
|
os.path.join(archivedir, get_local_archive_dir(ext_id)),
|
|
exist_ok=True)
|
|
except Exception as e:
|
|
log_exception("* FATAL: cannot create tmpdir", 3, ext_id)
|
|
tar_exception = e
|
|
return UpdateResult(ext_id, is_new, tar_exception, None, None, None,
|
|
None, sql_exception, False)
|
|
|
|
res_overview = update_overview(tmptardir, date, ext_id)
|
|
res_reviews = None
|
|
res_support = None
|
|
if forums:
|
|
res_reviews = update_reviews(tmptardir, date, ext_id)
|
|
|
|
res_crx = update_crx(archivedir, tmptardir, ext_id, date)
|
|
|
|
if forums:
|
|
res_support = update_support(tmptardir, date, ext_id)
|
|
|
|
backup = False
|
|
if backup:
|
|
try:
|
|
os.sync()
|
|
if os.path.exists(tardir + "bak.tar"):
|
|
shutil.move(tardir + ".bak.tar",
|
|
tardir + ".bak." + date + ".tar")
|
|
os.remove(tardir + ".bak." + date + ".tar")
|
|
except Exception:
|
|
pass
|
|
|
|
try:
|
|
if os.path.exists(tar):
|
|
shutil.copyfile(tar, tardir + ".bak.tar")
|
|
except Exception as e:
|
|
log_exception("* FATAL: cannot rename old tar archive", 3, ext_id)
|
|
tar_exception = e
|
|
try:
|
|
write_text(tardir, date, ext_id + ".tar.rename.exception",
|
|
traceback.format_exc())
|
|
except Exception:
|
|
pass
|
|
|
|
if not os.path.exists(tar):
|
|
is_new = True
|
|
try:
|
|
with tarfile.open(tar, mode='a:') as ar:
|
|
ar.add(tmptardir, arcname=ext_id)
|
|
except Exception as e:
|
|
log_exception("* FATAL: cannot create tar archive", 3, ext_id)
|
|
tar_exception = e
|
|
try:
|
|
write_text(tardir, date, ext_id + ".tar.create.exception",
|
|
traceback.format_exc())
|
|
except Exception:
|
|
pass
|
|
|
|
try:
|
|
update_db_incremental(tmptardir, ext_id, date)
|
|
sql_success = True
|
|
except Exception as e:
|
|
log_exception("* Exception during update of db", 3, ext_id)
|
|
sql_exception = e
|
|
|
|
try:
|
|
write_text(tardir, date, ext_id + ".sql.exception",
|
|
traceback.format_exc())
|
|
except Exception:
|
|
pass
|
|
try:
|
|
shutil.rmtree(path=tmpdir)
|
|
except Exception as e:
|
|
log_exception("* FATAL: cannot remove archive directory", 3, ext_id)
|
|
tar_exception = e
|
|
try:
|
|
write_text(tardir, date, ext_id + ".dir.remove.exception",
|
|
traceback.format_exc())
|
|
except Exception:
|
|
pass
|
|
|
|
log_info(
|
|
"* Duration: {}".format(
|
|
datetime.timedelta(seconds=int(time.time() - start))),
|
|
2,
|
|
ext_id)
|
|
return UpdateResult(ext_id, is_new, tar_exception, res_overview, res_crx,
|
|
res_reviews, res_support, sql_exception, sql_success)
|
|
|
|
|
|
def init_process(verbose, start_pystuck=False):
|
|
# When not using fork, we need to setup logging again in the worker threads
|
|
setup_logger(verbose)
|
|
|
|
if start_pystuck:
|
|
import pystuck
|
|
pystuck.run_server(port=((os.getpid() % 10000) + 10001))
|
|
|
|
|
|
def execute_parallel(archivedir, timeout, max_workers, ext_ids, forums, verbose, start_pystuck):
|
|
results = []
|
|
with ProcessPool(max_workers=max_workers, max_tasks=100, initializer=init_process,
|
|
initargs=(verbose, start_pystuck)) as pool:
|
|
future = pool.map(partial(update_extension, archivedir, forums), ext_ids, chunksize=1, timeout=timeout)
|
|
iterator = future.result()
|
|
for ext_id in ext_ids:
|
|
try:
|
|
results.append(next(iterator))
|
|
except StopIteration:
|
|
break
|
|
except TimeoutError as error:
|
|
log_warning("WorkerException: Processing of %s took longer than %d seconds" % (ext_id, error.args[1]))
|
|
results.append(UpdateResult(ext_id, False, None, None, None, None, None, None, None, error))
|
|
except ProcessExpired as error:
|
|
log_warning("WorkerException: %s (%s), exit code: %d" % (error, ext_id, error.exitcode))
|
|
results.append(UpdateResult(ext_id, False, None, None, None, None, None, None, None, error))
|
|
except Exception as error:
|
|
log_warning("WorkerException: Processing %s raised %s" % (ext_id, error))
|
|
log_warning(error.traceback) # Python's traceback of remote process
|
|
results.append(UpdateResult(ext_id, False, None, None, None, None, None, None, None, error))
|
|
|
|
return results
|
|
|
|
|
|
def update_extensions(archivedir, parallel, forums_ext_ids, ext_ids, timeout, verbose, start_pystuck):
|
|
forums_ext_ids = (list(set(forums_ext_ids)))
|
|
|
|
log_info("Updating {} extensions ({} including forums)".format(
|
|
len(ext_ids), len(forums_ext_ids)))
|
|
|
|
# First, update all extensions without forums in parallel (increased speed).
|
|
# parallel_ids = list(set(ext_ids) - set(forums_ext_ids))
|
|
parallel_ids = ext_ids
|
|
log_info("Updating {} extensions excluding forums (parallel)".format(
|
|
len(parallel_ids)), 1)
|
|
ext_without_forums = execute_parallel(archivedir, timeout, parallel, parallel_ids, False, verbose, start_pystuck)
|
|
|
|
# Second, update extensions with forums sequentially (and with delays) to
|
|
# avoid running into Googles DDOS detection.
|
|
log_info("Updating {} extensions including forums (sequentially)".format(
|
|
len(forums_ext_ids)), 1)
|
|
ext_with_forums = execute_parallel(archivedir, timeout, 1, forums_ext_ids, True, verbose, start_pystuck)
|
|
|
|
return ext_with_forums + ext_without_forums
|
|
|
|
|
|
def get_existing_ids(archivedir):
|
|
byte = '[0-9a-z][0-9a-z][0-9a-z][0-9a-z][0-9a-z][0-9a-z][0-9a-z][0-9a-z]'
|
|
word = byte + byte + byte + byte
|
|
return list(
|
|
map(lambda d: re.sub(".tar$", "", re.sub(r"^.*\/", "", d)),
|
|
glob.glob(os.path.join(archivedir, "*", word + ".tar"))))
|
|
|
|
|
|
def get_forum_ext_ids(confdir):
|
|
with open(os.path.join(confdir, "forums.conf")) as f:
|
|
ids = f.readlines()
|
|
r = re.compile('^[a-p]+$')
|
|
ids = [x.strip() for x in ids]
|
|
return list(filter(r.match, ids))
|