mirror of
https://github.com/ArchiveBox/ArchiveBox
synced 2024-11-10 14:44:18 +00:00
130 lines
4 KiB
Python
130 lines
4 KiB
Python
__package__ = 'archivebox.extractors'
|
|
|
|
import re
|
|
from html.parser import HTMLParser
|
|
from pathlib import Path
|
|
from typing import Optional
|
|
|
|
from ..index.schema import Link, ArchiveResult, ArchiveOutput, ArchiveError
|
|
from ..util import (
|
|
enforce_types,
|
|
download_url,
|
|
htmldecode,
|
|
)
|
|
from ..config import (
|
|
TIMEOUT,
|
|
CHECK_SSL_VALIDITY,
|
|
SAVE_TITLE,
|
|
CURL_BINARY,
|
|
CURL_ARGS,
|
|
CURL_VERSION,
|
|
CURL_USER_AGENT,
|
|
)
|
|
from ..logging_util import TimedProgress
|
|
|
|
|
|
|
|
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,
|
|
)
|
|
|
|
|
|
class TitleParser(HTMLParser):
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.title_tag = ""
|
|
self.title_og = ""
|
|
self.inside_title_tag = False
|
|
|
|
@property
|
|
def title(self):
|
|
return self.title_tag or self.title_og or None
|
|
|
|
def handle_starttag(self, tag, attrs):
|
|
if tag.lower() == "title" and not self.title_tag:
|
|
self.inside_title_tag = True
|
|
elif tag.lower() == "meta" and not self.title_og:
|
|
attrs = dict(attrs)
|
|
if attrs.get("property") == "og:title" and attrs.get("content"):
|
|
self.title_og = attrs.get("content")
|
|
|
|
def handle_data(self, data):
|
|
if self.inside_title_tag and data:
|
|
self.title_tag += data.strip()
|
|
|
|
def handle_endtag(self, tag):
|
|
if tag.lower() == "title":
|
|
self.inside_title_tag = False
|
|
|
|
|
|
@enforce_types
|
|
def should_save_title(link: Link, out_dir: Optional[str]=None, overwrite: Optional[bool]=False) -> bool:
|
|
# if link already has valid title, skip it
|
|
if not overwrite and link.title and not link.title.lower().startswith('http'):
|
|
return False
|
|
|
|
return SAVE_TITLE
|
|
|
|
def extract_title_with_regex(html):
|
|
match = re.search(HTML_TITLE_REGEX, html)
|
|
output = htmldecode(match.group(1).strip()) if match else None
|
|
return output
|
|
|
|
@enforce_types
|
|
def save_title(link: Link, out_dir: Optional[Path]=None, timeout: int=TIMEOUT) -> ArchiveResult:
|
|
"""try to guess the page's title from its content"""
|
|
|
|
from core.models import Snapshot
|
|
|
|
output: ArchiveOutput = None
|
|
cmd = [
|
|
CURL_BINARY,
|
|
*CURL_ARGS,
|
|
'--max-time', str(timeout),
|
|
*(['--user-agent', '{}'.format(CURL_USER_AGENT)] if CURL_USER_AGENT else []),
|
|
*([] if CHECK_SSL_VALIDITY else ['--insecure']),
|
|
link.url,
|
|
]
|
|
status = 'succeeded'
|
|
timer = TimedProgress(timeout, prefix=' ')
|
|
try:
|
|
html = download_url(link.url, timeout=timeout)
|
|
try:
|
|
# try using relatively strict html parser first
|
|
parser = TitleParser()
|
|
parser.feed(html)
|
|
output = parser.title
|
|
if output is None:
|
|
raise
|
|
except Exception:
|
|
# fallback to regex that can handle broken/malformed html
|
|
output = extract_title_with_regex(html)
|
|
|
|
# if title is better than the one in the db, update db with new title
|
|
if isinstance(output, str) and output:
|
|
if not link.title or len(output) >= len(link.title):
|
|
Snapshot.objects.filter(url=link.url,
|
|
timestamp=link.timestamp)\
|
|
.update(title=output)
|
|
else:
|
|
# if no content was returned, dont save a title (because it might be a temporary error)
|
|
if not html:
|
|
raise ArchiveError('Unable to detect page title')
|
|
# output = html[:128] # use first bit of content as the title
|
|
output = link.base_url # use the filename as the title (better UX)
|
|
except Exception as err:
|
|
status = 'failed'
|
|
output = err
|
|
finally:
|
|
timer.end()
|
|
|
|
return ArchiveResult(
|
|
cmd=cmd,
|
|
pwd=str(out_dir),
|
|
cmd_version=CURL_VERSION,
|
|
output=output,
|
|
status=status,
|
|
**timer.stats,
|
|
)
|