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ArchiveBox/archivebox/util.py
Nick Sweeting 73f46b0b29 add proper typechecked json parsing and dumping
2019-03-30 15:03:46 -04:00

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Python
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import os
import re
import sys
import json
import time
import shutil
from json import JSONEncoder
from typing import List, Optional, Any, Union
from inspect import signature, _empty
from functools import wraps
from hashlib import sha256
from urllib.request import Request, urlopen
from urllib.parse import urlparse, quote, unquote
from html import escape, unescape
from datetime import datetime
from multiprocessing import Process
from subprocess import (
Popen,
PIPE,
DEVNULL,
CompletedProcess,
TimeoutExpired,
CalledProcessError,
)
from base32_crockford import encode as base32_encode
from .schema import Link
from .config import (
ANSI,
TERM_WIDTH,
SOURCES_DIR,
OUTPUT_PERMISSIONS,
TIMEOUT,
SHOW_PROGRESS,
FETCH_TITLE,
CHECK_SSL_VALIDITY,
WGET_USER_AGENT,
CHROME_OPTIONS,
PYTHON_DIR,
)
from .logs import pretty_path
### Parsing Helpers
# All of these are (str) -> str
# shortcuts to: https://docs.python.org/3/library/urllib.parse.html#url-parsing
scheme = lambda url: urlparse(url).scheme.lower()
without_scheme = lambda url: urlparse(url)._replace(scheme='').geturl().strip('//')
without_query = lambda url: urlparse(url)._replace(query='').geturl().strip('//')
without_fragment = lambda url: urlparse(url)._replace(fragment='').geturl().strip('//')
without_path = lambda url: urlparse(url)._replace(path='', fragment='', query='').geturl().strip('//')
path = lambda url: urlparse(url).path
basename = lambda url: urlparse(url).path.rsplit('/', 1)[-1]
domain = lambda url: urlparse(url).netloc
query = lambda url: urlparse(url).query
fragment = lambda url: urlparse(url).fragment
extension = lambda url: basename(url).rsplit('.', 1)[-1].lower() if '.' in basename(url) else ''
base_url = lambda url: without_scheme(url) # uniq base url used to dedupe links
without_www = lambda url: url.replace('://www.', '://', 1)
without_trailing_slash = lambda url: url[:-1] if url[-1] == '/' else url.replace('/?', '?')
fuzzy_url = lambda url: without_trailing_slash(without_www(without_scheme(url.lower())))
short_ts = lambda ts: str(parse_date(ts).timestamp()).split('.')[0]
ts_to_date = lambda ts: parse_date(ts).strftime('%Y-%m-%d %H:%M')
ts_to_iso = lambda ts: parse_date(ts).isoformat()
urlencode = lambda s: s and quote(s, encoding='utf-8', errors='replace')
urldecode = lambda s: s and unquote(s)
htmlencode = lambda s: s and escape(s, quote=True)
htmldecode = lambda s: s and unescape(s)
hashurl = lambda url: base32_encode(int(sha256(base_url(url).encode('utf-8')).hexdigest(), 16))[:20]
URL_REGEX = re.compile(
r'http[s]?://' # start matching from allowed schemes
r'(?:[a-zA-Z]|[0-9]' # followed by allowed alphanum characters
r'|[$-_@.&+]|[!*\(\),]' # or allowed symbols
r'|(?:%[0-9a-fA-F][0-9a-fA-F]))' # or allowed unicode bytes
r'[^\]\[\(\)<>\""\'\s]+', # stop parsing at these symbols
re.IGNORECASE,
)
HTML_TITLE_REGEX = re.compile(
r'<title.*?>' # start matching text after <title> tag
r'(.[^<>]+)', # get everything up to these symbols
re.IGNORECASE | re.MULTILINE | re.DOTALL | re.UNICODE,
)
STATICFILE_EXTENSIONS = {
# 99.999% of the time, URLs ending in these extentions are static files
# that can be downloaded as-is, not html pages that need to be rendered
'gif', 'jpeg', 'jpg', 'png', 'tif', 'tiff', 'wbmp', 'ico', 'jng', 'bmp',
'svg', 'svgz', 'webp', 'ps', 'eps', 'ai',
'mp3', 'mp4', 'm4a', 'mpeg', 'mpg', 'mkv', 'mov', 'webm', 'm4v',
'flv', 'wmv', 'avi', 'ogg', 'ts', 'm3u8',
'pdf', 'txt', 'rtf', 'rtfd', 'doc', 'docx', 'ppt', 'pptx', 'xls', 'xlsx',
'atom', 'rss', 'css', 'js', 'json',
'dmg', 'iso', 'img',
'rar', 'war', 'hqx', 'zip', 'gz', 'bz2', '7z',
# Less common extensions to consider adding later
# jar, swf, bin, com, exe, dll, deb
# ear, hqx, eot, wmlc, kml, kmz, cco, jardiff, jnlp, run, msi, msp, msm,
# pl pm, prc pdb, rar, rpm, sea, sit, tcl tk, der, pem, crt, xpi, xspf,
# ra, mng, asx, asf, 3gpp, 3gp, mid, midi, kar, jad, wml, htc, mml
# Thse are always treated as pages, not as static files, never add them:
# html, htm, shtml, xhtml, xml, aspx, php, cgi
}
### Checks & Tests
def enforce_types(func):
"""
Enforce function arg and kwarg types at runtime using its python3 type hints
"""
# TODO: check return type as well
@wraps(func)
def typechecked_function(*args, **kwargs):
sig = signature(func)
def check_argument_type(arg_key, arg_val):
try:
annotation = sig.parameters[arg_key].annotation
except KeyError:
annotation = _empty
if annotation is not _empty and annotation.__class__ is type:
if not isinstance(arg_val, annotation):
raise TypeError(
'{}(..., {}: {}) got unexpected {} argument {}={}'.format(
func.__name__,
arg_key,
annotation.__name__,
type(arg_val).__name__,
arg_key,
str(arg_val)[:64],
)
)
# check args
for arg_val, arg_key in zip(args, sig.parameters):
check_argument_type(arg_key, arg_val)
# check kwargs
for arg_key, arg_val in kwargs.items():
check_argument_type(arg_key, arg_val)
return func(*args, **kwargs)
return typechecked_function
def check_url_parsing_invariants() -> None:
"""Check that plain text regex URL parsing works as expected"""
# this is last-line-of-defense to make sure the URL_REGEX isn't
# misbehaving, as the consequences could be disastrous and lead to many
# incorrect/badly parsed links being added to the archive
test_urls = '''
https://example1.com/what/is/happening.html?what=1#how-about-this=1
https://example2.com/what/is/happening/?what=1#how-about-this=1
HTtpS://example3.com/what/is/happening/?what=1#how-about-this=1f
https://example4.com/what/is/happening.html
https://example5.com/
https://example6.com
<test>http://example7.com</test>
[https://example8.com/what/is/this.php?what=1]
[and http://example9.com?what=1&other=3#and-thing=2]
<what>https://example10.com#and-thing=2 "</about>
abc<this["https://example11.com/what/is#and-thing=2?whoami=23&where=1"]that>def
sdflkf[what](https://example12.com/who/what.php?whoami=1#whatami=2)?am=hi
example13.bada
and example14.badb
<or>htt://example15.badc</that>
'''
# print('\n'.join(re.findall(URL_REGEX, test_urls)))
assert len(re.findall(URL_REGEX, test_urls)) == 12
### Random Helpers
@enforce_types
def handle_stdin_import(raw_text: str) -> str:
if not os.path.exists(SOURCES_DIR):
os.makedirs(SOURCES_DIR)
ts = str(datetime.now().timestamp()).split('.', 1)[0]
source_path = os.path.join(SOURCES_DIR, '{}-{}.txt'.format('stdin', ts))
atomic_write(raw_text, source_path)
return source_path
@enforce_types
def handle_file_import(path: str, timeout: int=TIMEOUT) -> str:
"""download a given url's content into output/sources/domain-<timestamp>.txt"""
if not os.path.exists(SOURCES_DIR):
os.makedirs(SOURCES_DIR)
ts = str(datetime.now().timestamp()).split('.', 1)[0]
source_path = os.path.join(SOURCES_DIR, '{}-{}.txt'.format(basename(path), ts))
if any(path.startswith(s) for s in ('http://', 'https://', 'ftp://')):
source_path = os.path.join(SOURCES_DIR, '{}-{}.txt'.format(domain(path), ts))
print('{}[*] [{}] Downloading {}{}'.format(
ANSI['green'],
datetime.now().strftime('%Y-%m-%d %H:%M:%S'),
path,
ANSI['reset'],
))
timer = TimedProgress(timeout, prefix=' ')
try:
raw_source_text = download_url(path, timeout=timeout)
timer.end()
except Exception as e:
timer.end()
print('{}[!] Failed to download {}{}\n'.format(
ANSI['red'],
path,
ANSI['reset'],
))
print(' ', e)
raise SystemExit(1)
else:
with open(path, 'r') as f:
raw_source_text = f.read()
atomic_write(raw_source_text, source_path)
print(' > {}'.format(pretty_path(source_path)))
return source_path
@enforce_types
def fetch_page_title(url: str, timeout: int=10, progress: bool=SHOW_PROGRESS) -> Optional[str]:
"""Attempt to guess a page's title by downloading the html"""
if not FETCH_TITLE:
return None
try:
if progress:
sys.stdout.write('.')
sys.stdout.flush()
html = download_url(url, timeout=timeout)
match = re.search(HTML_TITLE_REGEX, html)
return htmldecode(match.group(1).strip()) if match else None
except Exception as err: # noqa
# print('[!] Failed to fetch title because of {}: {}'.format(
# err.__class__.__name__,
# err,
# ))
return None
@enforce_types
def wget_output_path(link: Link) -> Optional[str]:
"""calculate the path to the wgetted .html file, since wget may
adjust some paths to be different than the base_url path.
See docs on wget --adjust-extension (-E)
"""
if is_static_file(link.url):
return without_scheme(without_fragment(link.url))
# Wget downloads can save in a number of different ways depending on the url:
# https://example.com
# > output/archive/<timestamp>/example.com/index.html
# https://example.com?v=zzVa_tX1OiI
# > output/archive/<timestamp>/example.com/index.html?v=zzVa_tX1OiI.html
# https://www.example.com/?v=zzVa_tX1OiI
# > output/archive/<timestamp>/example.com/index.html?v=zzVa_tX1OiI.html
# https://example.com/abc
# > output/archive/<timestamp>/example.com/abc.html
# https://example.com/abc/
# > output/archive/<timestamp>/example.com/abc/index.html
# https://example.com/abc?v=zzVa_tX1OiI.html
# > output/archive/<timestamp>/example.com/abc?v=zzVa_tX1OiI.html
# https://example.com/abc/?v=zzVa_tX1OiI.html
# > output/archive/<timestamp>/example.com/abc/index.html?v=zzVa_tX1OiI.html
# https://example.com/abc/test.html
# > output/archive/<timestamp>/example.com/abc/test.html
# https://example.com/abc/test?v=zzVa_tX1OiI
# > output/archive/<timestamp>/example.com/abc/test?v=zzVa_tX1OiI.html
# https://example.com/abc/test/?v=zzVa_tX1OiI
# > output/archive/<timestamp>/example.com/abc/test/index.html?v=zzVa_tX1OiI.html
# There's also lots of complexity around how the urlencoding and renaming
# is done for pages with query and hash fragments or extensions like shtml / htm / php / etc
# Since the wget algorithm for -E (appending .html) is incredibly complex
# and there's no way to get the computed output path from wget
# in order to avoid having to reverse-engineer how they calculate it,
# we just look in the output folder read the filename wget used from the filesystem
full_path = without_fragment(without_query(path(link.url))).strip('/')
search_dir = os.path.join(
link.link_dir,
domain(link.url),
full_path,
)
for _ in range(4):
if os.path.exists(search_dir):
if os.path.isdir(search_dir):
html_files = [
f for f in os.listdir(search_dir)
if re.search(".+\\.[Hh][Tt][Mm][Ll]?$", f, re.I | re.M)
]
if html_files:
path_from_link_dir = search_dir.split(link.link_dir)[-1].strip('/')
return os.path.join(path_from_link_dir, html_files[0])
# Move up one directory level
search_dir = search_dir.rsplit('/', 1)[0]
if search_dir == link.link_dir:
break
return None
@enforce_types
def read_js_script(script_name: str) -> str:
script_path = os.path.join(PYTHON_DIR, 'scripts', script_name)
with open(script_path, 'r') as f:
return f.read().split('// INFO BELOW HERE')[0].strip()
### String Manipulation & Logging Helpers
@enforce_types
def str_between(string: str, start: str, end: str=None) -> str:
"""(<abc>12345</def>, <abc>, </def>) -> 12345"""
content = string.split(start, 1)[-1]
if end is not None:
content = content.rsplit(end, 1)[0]
return content
@enforce_types
def parse_date(date: Any) -> Optional[datetime]:
"""Parse unix timestamps, iso format, and human-readable strings"""
if isinstance(date, datetime):
return date
if date is None:
return None
if isinstance(date, (float, int)):
date = str(date)
if isinstance(date, str):
if date.replace('.', '').isdigit():
timestamp = float(date)
EARLIEST_POSSIBLE = 473403600.0 # 1985
LATEST_POSSIBLE = 1735707600.0 # 2025
if EARLIEST_POSSIBLE < timestamp < LATEST_POSSIBLE:
# number is seconds
return datetime.fromtimestamp(timestamp)
elif EARLIEST_POSSIBLE * 1000 < timestamp < LATEST_POSSIBLE * 1000:
# number is milliseconds
return datetime.fromtimestamp(timestamp / 1000)
elif EARLIEST_POSSIBLE * 1000*1000 < timestamp < LATEST_POSSIBLE * 1000*1000:
# number is microseconds
return datetime.fromtimestamp(timestamp / (1000*1000))
if '-' in date:
try:
return datetime.fromisoformat(date)
except Exception:
try:
return datetime.strptime(date, '%Y-%m-%d %H:%M')
except Exception:
pass
raise ValueError('Tried to parse invalid date! {}'.format(date))
### Link Helpers
@enforce_types
def merge_links(a: Link, b: Link) -> Link:
"""deterministially merge two links, favoring longer field values over shorter,
and "cleaner" values over worse ones.
"""
assert a.base_url == b.base_url, 'Cannot merge two links with different URLs'
url = a.url if len(a.url) > len(b.url) else b.url
possible_titles = [
title
for title in (a.title, b.title)
if title and title.strip() and '://' not in title
]
title = None
if len(possible_titles) == 2:
title = max(possible_titles, key=lambda t: len(t))
elif len(possible_titles) == 1:
title = possible_titles[0]
timestamp = (
a.timestamp
if float(a.timestamp or 0) < float(b.timestamp or 0) else
b.timestamp
)
tags_set = (
set(tag.strip() for tag in (a.tags or '').split(','))
| set(tag.strip() for tag in (b.tags or '').split(','))
)
tags = ','.join(tags_set) or None
sources = list(set(a.sources + b.sources))
all_methods = (set(a.history.keys()) | set(a.history.keys()))
history = {
method: (a.history.get(method) or []) + (b.history.get(method) or [])
for method in all_methods
}
return Link(
url=url,
timestamp=timestamp,
title=title,
tags=tags,
sources=sources,
history=history,
)
@enforce_types
def is_static_file(url: str) -> bool:
"""Certain URLs just point to a single static file, and
don't need to be re-archived in many formats
"""
# TODO: the proper way is with MIME type detection, not using extension
return extension(url) in STATICFILE_EXTENSIONS
@enforce_types
def derived_link_info(link: Link) -> dict:
"""extend link info with the archive urls and other derived data"""
info = link._asdict(extended=True)
info.update(link.canonical_outputs())
return info
### Python / System Helpers
def run(*popenargs, input=None, capture_output=False, timeout=None, check=False, **kwargs):
"""Patched of subprocess.run to fix blocking io making timeout=innefective"""
if input is not None:
if 'stdin' in kwargs:
raise ValueError('stdin and input arguments may not both be used.')
kwargs['stdin'] = PIPE
if capture_output:
if ('stdout' in kwargs) or ('stderr' in kwargs):
raise ValueError('stdout and stderr arguments may not be used '
'with capture_output.')
kwargs['stdout'] = PIPE
kwargs['stderr'] = PIPE
with Popen(*popenargs, **kwargs) as process:
try:
stdout, stderr = process.communicate(input, timeout=timeout)
except TimeoutExpired:
process.kill()
try:
stdout, stderr = process.communicate(input, timeout=2)
except:
pass
raise TimeoutExpired(popenargs[0][0], timeout)
except BaseException:
process.kill()
# We don't call process.wait() as .__exit__ does that for us.
raise
retcode = process.poll()
if check and retcode:
raise CalledProcessError(retcode, process.args,
output=stdout, stderr=stderr)
return CompletedProcess(process.args, retcode, stdout, stderr)
class TimedProgress:
"""Show a progress bar and measure elapsed time until .end() is called"""
def __init__(self, seconds, prefix=''):
if SHOW_PROGRESS:
self.p = Process(target=progress_bar, args=(seconds, prefix))
self.p.start()
self.stats = {'start_ts': datetime.now(), 'end_ts': None}
def end(self):
"""immediately end progress, clear the progressbar line, and save end_ts"""
end_ts = datetime.now()
self.stats['end_ts'] = end_ts
if SHOW_PROGRESS:
# protect from double termination
#if p is None or not hasattr(p, 'kill'):
# return
if self.p is not None:
self.p.terminate()
self.p = None
sys.stdout.write('\r{}{}\r'.format((' ' * TERM_WIDTH()), ANSI['reset'])) # clear whole terminal line
@enforce_types
def progress_bar(seconds: int, prefix: str='') -> None:
"""show timer in the form of progress bar, with percentage and seconds remaining"""
chunk = '█' if sys.stdout.encoding == 'UTF-8' else '#'
chunks = TERM_WIDTH() - len(prefix) - 20 # number of progress chunks to show (aka max bar width)
try:
for s in range(seconds * chunks):
chunks = TERM_WIDTH() - len(prefix) - 20
progress = s / chunks / seconds * 100
bar_width = round(progress/(100/chunks))
# ████████████████████ 0.9% (1/60sec)
sys.stdout.write('\r{0}{1}{2}{3} {4}% ({5}/{6}sec)'.format(
prefix,
ANSI['green'],
(chunk * bar_width).ljust(chunks),
ANSI['reset'],
round(progress, 1),
round(s/chunks),
seconds,
))
sys.stdout.flush()
time.sleep(1 / chunks)
# ██████████████████████████████████ 100.0% (60/60sec)
sys.stdout.write('\r{0}{1}{2}{3} {4}% ({5}/{6}sec)\n'.format(
prefix,
ANSI['red'],
chunk * chunks,
ANSI['reset'],
100.0,
seconds,
seconds,
))
sys.stdout.flush()
except KeyboardInterrupt:
print()
pass
@enforce_types
def download_url(url: str, timeout: int=TIMEOUT) -> str:
"""Download the contents of a remote url and return the text"""
req = Request(url, headers={'User-Agent': WGET_USER_AGENT})
if CHECK_SSL_VALIDITY:
resp = urlopen(req, timeout=timeout)
else:
import ssl
insecure = ssl._create_unverified_context()
resp = urlopen(req, timeout=timeout, context=insecure)
encoding = resp.headers.get_content_charset() or 'utf-8'
return resp.read().decode(encoding)
@enforce_types
def chmod_file(path: str, cwd: str='.', permissions: str=OUTPUT_PERMISSIONS, timeout: int=30) -> None:
"""chmod -R <permissions> <cwd>/<path>"""
if not os.path.exists(os.path.join(cwd, path)):
raise Exception('Failed to chmod: {} does not exist (did the previous step fail?)'.format(path))
chmod_result = run(['chmod', '-R', permissions, path], cwd=cwd, stdout=DEVNULL, stderr=PIPE, timeout=timeout)
if chmod_result.returncode == 1:
print(' ', chmod_result.stderr.decode())
raise Exception('Failed to chmod {}/{}'.format(cwd, path))
@enforce_types
def copy_and_overwrite(from_path: str, to_path: str):
if os.path.exists(to_path):
shutil.rmtree(to_path)
shutil.copytree(from_path, to_path)
@enforce_types
def chrome_args(**options) -> List[str]:
"""helper to build up a chrome shell command with arguments"""
options = {**CHROME_OPTIONS, **options}
cmd_args = [options['CHROME_BINARY']]
if options['CHROME_HEADLESS']:
cmd_args += ('--headless',)
if not options['CHROME_SANDBOX']:
# dont use GPU or sandbox when running inside docker container
cmd_args += ('--no-sandbox', '--disable-gpu')
if not options['CHECK_SSL_VALIDITY']:
cmd_args += ('--disable-web-security', '--ignore-certificate-errors')
if options['CHROME_USER_AGENT']:
cmd_args += ('--user-agent={}'.format(options['CHROME_USER_AGENT']),)
if options['RESOLUTION']:
cmd_args += ('--window-size={}'.format(options['RESOLUTION']),)
if options['TIMEOUT']:
cmd_args += ('--timeout={}'.format((options['TIMEOUT']) * 1000),)
if options['CHROME_USER_DATA_DIR']:
cmd_args.append('--user-data-dir={}'.format(options['CHROME_USER_DATA_DIR']))
return cmd_args
class ExtendedEncoder(JSONEncoder):
"""
Extended json serializer that supports serializing several model
fields and objects
"""
def default(self, obj):
cls_name = obj.__class__.__name__
if hasattr(obj, '_asdict'):
return obj._asdict()
elif isinstance(obj, bytes):
return obj.decode()
elif isinstance(obj, datetime):
return obj.isoformat()
elif isinstance(obj, Exception):
return '{}: {}'.format(obj.__class__.__name__, obj)
elif cls_name in ('dict_items', 'dict_keys', 'dict_values'):
return tuple(obj)
return JSONEncoder.default(self, obj)
def atomic_write(contents: Union[dict, str], path: str) -> None:
"""Safe atomic write to filesystem by writing to temp file + atomic rename"""
try:
tmp_file = '{}.tmp'.format(path)
with open(tmp_file, 'w+', encoding='utf-8') as f:
if isinstance(contents, dict):
json.dump(contents, f, indent=4, cls=ExtendedEncoder)
else:
f.write(contents)
os.fsync(f.fileno())
os.rename(tmp_file, path)
chmod_file(path)
finally:
if os.path.exists(tmp_file):
os.remove(tmp_file)
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