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# Copyright (c) 2018 crocoite contributors
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
Misc tools
"""
import shutil, sys, os, logging, argparse, json
from io import BytesIO
from warcio.archiveiterator import ArchiveIterator
from warcio.warcwriter import WARCWriter
from pkg_resources import parse_version, parse_requirements
from .util import packageUrl, getSoftwareInfo
def mergeWarc (files, output):
unique = 0
revisit = 0
payloadMap = {}
writer = WARCWriter (output, gzip=True)
# Add an additional warcinfo record, describing the transformations. This
# is not ideal, since
# “A ‘warcinfo’ record describes the records that
# follow it […] until next ‘warcinfo’”
# -- https://iipc.github.io/warc-specifications/specifications/warc-format/warc-1.1/#warcinfo
# A warcinfo record is expected at the beginning of every file. But it
# might have written by a different software, so we don’t want to
# strip/replace that information, but supplement it.
warcinfo = {
'software': getSoftwareInfo (),
'tool': 'crocoite-merge', # not the name of the cli tool
'parameters': {'inputs': files},
}
payload = BytesIO (json.dumps (warcinfo, indent=2).encode ('utf-8'))
record = writer.create_warc_record (packageUrl ('warcinfo'), 'warcinfo',
payload=payload,
warc_headers_dict={'Content-Type': 'text/plain; encoding=utf-8'})
writer.write_record (record)
for l in files:
with open (l, 'rb') as fd:
for record in ArchiveIterator (fd):
if record.rec_type in {'resource', 'response'}:
headers = record.rec_headers
rid = headers.get_header('WARC-Record-ID')
csum = headers.get_header('WARC-Payload-Digest')
dup = payloadMap.get (csum, None)
if dup is None:
payloadMap[csum] = {'uri': headers.get_header('WARC-Target-URI'),
'id': rid, 'date': headers.get_header('WARC-Date')}
unique += 1
else:
logging.debug ('Record {} is duplicate of {}'.format (rid, dup['id']))
# Payload may be identical, but HTTP headers are
# (probably) not. Include them.
record = writer.create_revisit_record (
headers.get_header('WARC-Target-URI'), digest=csum,
refers_to_uri=dup['uri'], refers_to_date=dup['date'],
http_headers=record.http_headers)
record.rec_headers.add_header ('WARC-Truncated', 'length')
record.rec_headers.add_header ('WARC-Refers-To', dup['id'])
revisit += 1
else:
unique += 1
writer.write_record (record)
logging.info ('Wrote {} unique records, {} revisits'.format (unique, revisit))
def mergeWarcCli():
parser = argparse.ArgumentParser(description='Merge WARCs, reads filenames from stdin.')
parser.add_argument('--verbose', '-v', action='store_true')
parser.add_argument('output', type=argparse.FileType ('wb'), help='Output WARC')
args = parser.parse_args()
loglevel = logging.DEBUG if args.verbose else logging.INFO
logging.basicConfig (level=loglevel)
mergeWarc([l.strip() for l in sys.stdin], args.output)
def extractScreenshot ():
"""
Extract page screenshots from a WARC generated by crocoite into files
"""
parser = argparse.ArgumentParser(description='Extract screenshots.')
parser.add_argument('-f', '--force', action='store_true', help='Overwrite existing files')
parser.add_argument('input', type=argparse.FileType ('rb'), help='Input WARC')
parser.add_argument('prefix', help='Output file prefix')
args = parser.parse_args()
with args.input:
for record in ArchiveIterator (args.input):
headers = record.rec_headers
if record.rec_type != 'conversion' or \
headers['Content-Type'] != 'image/png' or \
'X-Crocoite-Screenshot-Y-Offset' not in headers:
continue
urlSanitized = headers.get_header('WARC-Target-URI').replace ('/', '_')
xoff = 0
yoff = int (headers.get_header ('X-Crocoite-Screenshot-Y-Offset'))
outpath = '{}-{}-{}-{}.png'.format (args.prefix, urlSanitized, xoff, yoff)
if args.force or not os.path.exists (outpath):
with open (outpath, 'wb') as out:
shutil.copyfileobj (record.raw_stream, out)
else:
print ('not overwriting {}'.format (outpath))
class Errata:
__slots__ = ('uuid', 'description', 'affects')
def __init__ (self, uuid, description, affects):
self.uuid = uuid
self.description = description
# slightly abusing setuptool’s version parsing/matching here
self.affects = list (parse_requirements(affects))
def __contains__ (self, pkg):
"""
Return True if the versions in pkg are affected by this errata
pkg must be a mapping from project_name to version
"""
matchedAll = []
for a in self.affects:
haveVersion = pkg.get (a.project_name, None)
matchedAll.append (haveVersion is not None and haveVersion in a)
return all (matchedAll)
def __repr__ (self):
return '{}({!r}, {!r}, {!r})'.format (self.__class__.__name__,
self.uuid, self.description, self.affects)
@property
def fixable (self):
return getattr (self, 'applyFix', None) is not None
def toDict (self):
return {'uuid': self.uuid,
'description': self.description,
'affects': list (map (str, self.affects)),
'fixable': self.fixable}
class FixableErrata(Errata):
def applyFix (self, records):
raise NotImplementedError () # pragma: no cover
bugs = [
Errata (uuid='34a176b3-ad3d-430f-a082-68087f304572',
description='Generated by version < 1.0. No erratas are supported for this version.',
affects=['crocoite<1.0'],
),
]
def makeReport (fd):
for record in ArchiveIterator (fd):
if record.rec_type == 'warcinfo':
try:
data = json.load (record.raw_stream)
haveVersions = dict ([(pkg['projectName'], parse_version(pkg['version'])) for pkg in data['software']['self']])
yield from filter (lambda b: haveVersions in b, bugs)
except json.decoder.JSONDecodeError:
pass
def errata ():
parser = argparse.ArgumentParser(description='Show/fix erratas for WARCs generated by {}.'.format (__package__))
parser.add_argument('input', type=argparse.FileType ('rb'), help='Input WARC')
args = parser.parse_args()
hasErrata = False
for item in makeReport (args.input):
json.dump (item.toDict (), sys.stdout)
sys.stdout.write ('\n')
sys.stdout.flush ()
hasErrata = True
return int (hasErrata)
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