mirror of
https://github.com/sissbruecker/linkding
synced 2024-11-10 06:04:15 +00:00
102 lines
3.4 KiB
Python
102 lines
3.4 KiB
Python
import logging
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from dataclasses import dataclass
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from functools import lru_cache
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import requests
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from bs4 import BeautifulSoup
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from charset_normalizer import from_bytes
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from django.utils import timezone
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logger = logging.getLogger(__name__)
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@dataclass
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class WebsiteMetadata:
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url: str
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title: str
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description: str
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def to_dict(self):
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return {
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'url': self.url,
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'title': self.title,
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'description': self.description,
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}
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# Caching metadata avoids scraping again when saving bookmarks, in case the
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# metadata was already scraped to show preview values in the bookmark form
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@lru_cache(maxsize=10)
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def load_website_metadata(url: str):
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title = None
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description = None
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try:
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start = timezone.now()
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page_text = load_page(url)
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end = timezone.now()
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logger.debug(f'Load duration: {end - start}')
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start = timezone.now()
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soup = BeautifulSoup(page_text, 'html.parser')
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title = soup.title.string.strip() if soup.title is not None else None
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description_tag = soup.find('meta', attrs={'name': 'description'})
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description = description = description_tag['content'].strip() if description_tag and description_tag[
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'content'] else None
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end = timezone.now()
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logger.debug(f'Parsing duration: {end - start}')
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finally:
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return WebsiteMetadata(url=url, title=title, description=description)
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CHUNK_SIZE = 50 * 1024
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MAX_CONTENT_LIMIT = 5000 * 1024
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def load_page(url: str):
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headers = fake_request_headers()
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size = 0
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content = None
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iteration = 0
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# Use with to ensure request gets closed even if it's only read partially
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with requests.get(url, timeout=10, headers=headers, stream=True) as r:
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for chunk in r.iter_content(chunk_size=CHUNK_SIZE):
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size += len(chunk)
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iteration = iteration + 1
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if content is None:
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content = chunk
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else:
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content = content + chunk
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logger.debug(f'Loaded chunk (iteration={iteration}, total={size / 1024})')
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# Stop reading if we have parsed end of head tag
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if '</head>'.encode('utf-8') in content:
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logger.debug(f'Found closing head tag after {size} bytes')
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break
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# Stop reading if we exceed limit
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if size > MAX_CONTENT_LIMIT:
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logger.debug(f'Cancel reading document after {size} bytes')
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break
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if hasattr(r, '_content_consumed'):
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logger.debug(f'Request consumed: {r._content_consumed}')
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# Use charset_normalizer to determine encoding that best matches the response content
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# Several sites seem to specify the response encoding incorrectly, so we ignore it and use custom logic instead
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# This is different from Response.text which does respect the encoding specified in the response first,
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# before trying to determine one
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results = from_bytes(content or '')
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return str(results.best())
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DEFAULT_USER_AGENT = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.0.0 Safari/537.36'
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def fake_request_headers():
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return {
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"Accept": "text/html,application/xhtml+xml,application/xml",
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"Accept-Encoding": "gzip, deflate",
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"Dnt": "1",
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"Upgrade-Insecure-Requests": "1",
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"User-Agent": DEFAULT_USER_AGENT,
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}
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