mirror of
https://github.com/bellingcat/auto-archiver.git
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115 lines
3.9 KiB
Python
115 lines
3.9 KiB
Python
""" The `extractor` module defines the base functionality for implementing extractors in the media archiving framework.
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This class provides common utility methods and a standard interface for extractors.
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Factory method to initialize an extractor instance based on its name.
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"""
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from __future__ import annotations
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from pathlib import Path
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from abc import abstractmethod
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from dataclasses import dataclass
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import mimetypes
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import os
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import mimetypes
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import requests
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from loguru import logger
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from retrying import retry
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import re
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from auto_archiver.core import Metadata, BaseModule
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class Extractor(BaseModule):
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"""
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Base class for implementing extractors in the media archiving framework.
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Subclasses must implement the `download` method to define platform-specific behavior.
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"""
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valid_url: re.Pattern = None
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def cleanup(self) -> None:
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"""
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Called when extractors are done, or upon errors, cleanup any resources
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"""
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pass
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def sanitize_url(self, url: str) -> str:
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"""
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Used to clean unnecessary URL parameters OR unfurl redirect links
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"""
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return url
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def match_link(self, url: str) -> re.Match:
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"""
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Returns a match object if the given URL matches the valid_url pattern or False/None if not.
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Normally used in the `suitable` method to check if the URL is supported by this extractor.
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"""
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return self.valid_url.match(url)
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def suitable(self, url: str) -> bool:
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"""
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Returns True if this extractor can handle the given URL
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Should be overridden by subclasses
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"""
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if self.valid_url:
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return self.match_link(url) is not None
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return True
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def _guess_file_type(self, path: str) -> str:
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"""
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Receives a URL or filename and returns global mimetype like 'image' or 'video'
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see https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
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"""
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mime = mimetypes.guess_type(path)[0]
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if mime is not None:
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return mime.split("/")[0]
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return ""
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@retry(wait_random_min=500, wait_random_max=3500, stop_max_attempt_number=5)
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def download_from_url(self, url: str, to_filename: str = None, verbose=True) -> str:
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"""
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downloads a URL to provided filename, or inferred from URL, returns local filename
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"""
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if not to_filename:
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to_filename = url.split('/')[-1].split('?')[0]
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if len(to_filename) > 64:
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to_filename = to_filename[-64:]
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to_filename = os.path.join(self.tmp_dir, to_filename)
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if verbose: logger.debug(f"downloading {url[0:50]=} {to_filename=}")
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headers = {
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'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36'
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}
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try:
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d = requests.get(url, stream=True, headers=headers, timeout=30)
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d.raise_for_status()
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# get mimetype from the response headers
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if not mimetypes.guess_type(to_filename)[0]:
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content_type = d.headers.get('Content-Type') or self._guess_file_type(url)
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extension = mimetypes.guess_extension(content_type)
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if extension:
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to_filename += extension
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with open(to_filename, 'wb') as f:
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for chunk in d.iter_content(chunk_size=8192):
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f.write(chunk)
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return to_filename
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except requests.RequestException as e:
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logger.warning(f"Failed to fetch the Media URL: {e}")
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@abstractmethod
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def download(self, item: Metadata) -> Metadata | False:
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"""
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Downloads the media from the given URL and returns a Metadata object with the downloaded media.
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If the URL is not supported or the download fails, this method should return False.
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"""
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pass |