136 lines
4.2 KiB
Python
136 lines
4.2 KiB
Python
__package__ = 'archivebox.extractors'
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from pathlib import Path
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from tempfile import NamedTemporaryFile
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from typing import Optional
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import json
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from ..index.schema import Link, ArchiveResult, ArchiveError
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from ..system import run, atomic_write
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from ..util import (
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enforce_types,
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download_url,
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is_static_file,
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)
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from ..config import (
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TIMEOUT,
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CURL_BINARY,
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SAVE_READABILITY,
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DEPENDENCIES,
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READABILITY_VERSION,
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)
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from ..logging_util import TimedProgress
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@enforce_types
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def get_html(link: Link, path: Path) -> str:
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"""
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Try to find wget, singlefile and then dom files.
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If none is found, download the url again.
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"""
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canonical = link.canonical_outputs()
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abs_path = path.absolute()
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sources = [canonical["singlefile_path"], canonical["wget_path"], canonical["dom_path"]]
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document = None
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for source in sources:
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try:
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with open(abs_path / source, "r", encoding="utf-8") as f:
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document = f.read()
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break
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except (FileNotFoundError, TypeError):
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continue
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if document is None:
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return download_url(link.url)
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else:
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return document
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@enforce_types
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def should_save_readability(link: Link, out_dir: Optional[str]=None, overwrite: Optional[bool]=False) -> bool:
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if is_static_file(link.url):
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return False
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out_dir = out_dir or Path(link.link_dir)
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if not overwrite and (out_dir / 'readability').exists():
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return False
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return SAVE_READABILITY
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@enforce_types
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def save_readability(link: Link, out_dir: Optional[str]=None, timeout: int=TIMEOUT) -> ArchiveResult:
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"""download reader friendly version using @mozilla/readability"""
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out_dir = Path(out_dir or link.link_dir)
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output_folder = out_dir.absolute() / "readability"
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output = "readability"
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# Readability Docs: https://github.com/mozilla/readability
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status = 'succeeded'
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# fake command to show the user so they have something to try debugging if get_html fails
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cmd = [
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CURL_BINARY,
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link.url
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]
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readability_content = None
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timer = TimedProgress(timeout, prefix=' ')
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try:
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document = get_html(link, out_dir)
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temp_doc = NamedTemporaryFile(delete=False)
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temp_doc.write(document.encode("utf-8"))
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temp_doc.close()
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if not document or len(document) < 10:
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raise ArchiveError('Readability could not find HTML to parse for article text')
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cmd = [
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DEPENDENCIES['READABILITY_BINARY']['path'],
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temp_doc.name,
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]
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result = run(cmd, cwd=out_dir, timeout=timeout)
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try:
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result_json = json.loads(result.stdout)
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assert result_json and 'content' in result_json
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except json.JSONDecodeError:
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raise ArchiveError('Readability was not able to archive the page', result.stdout + result.stderr)
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output_folder.mkdir(exist_ok=True)
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readability_content = result_json.pop("textContent")
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atomic_write(str(output_folder / "content.html"), result_json.pop("content"))
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atomic_write(str(output_folder / "content.txt"), readability_content)
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atomic_write(str(output_folder / "article.json"), result_json)
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# parse out number of files downloaded from last line of stderr:
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# "Downloaded: 76 files, 4.0M in 1.6s (2.52 MB/s)"
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output_tail = [
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line.strip()
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for line in (result.stdout + result.stderr).decode().rsplit('\n', 3)[-3:]
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if line.strip()
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]
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hints = (
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'Got readability response code: {}.'.format(result.returncode),
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*output_tail,
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)
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# Check for common failure cases
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if (result.returncode > 0):
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raise ArchiveError('Readability was not able to archive the page', hints)
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except (Exception, OSError) as err:
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status = 'failed'
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output = err
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cmd = [cmd[0], './{singlefile,dom}.html']
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finally:
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timer.end()
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return ArchiveResult(
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cmd=cmd,
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pwd=str(out_dir),
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cmd_version=READABILITY_VERSION,
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output=output,
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status=status,
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index_texts=[readability_content] if readability_content else [],
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**timer.stats,
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)
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