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Add htmltotext extractor

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Saves HTML text nodes and selected element attributes in
`htmltotext.txt` for each Snapshot. Primarily intended to be used
for search indexing.
This commit is contained in:
Ross Williams 2023-10-23 21:42:25 -04:00
parent 6555719489
commit 310b4d1242
9 changed files with 203 additions and 104 deletions
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1
archivebox/config.py
View file

@ -134,6 +134,7 @@ CONFIG_SCHEMA: Dict[str, ConfigDefaultDict] = {
'SAVE_SINGLEFILE': {'type': bool, 'default': True, 'aliases': ('FETCH_SINGLEFILE',)},
'SAVE_READABILITY': {'type': bool, 'default': True, 'aliases': ('FETCH_READABILITY',)},
'SAVE_MERCURY': {'type': bool, 'default': True, 'aliases': ('FETCH_MERCURY',)},
'SAVE_HTMLTOTEXT': {'type': bool, 'default': True, 'aliases': ('FETCH_HTMLTOTEXT',)},
'SAVE_PDF': {'type': bool, 'default': True, 'aliases': ('FETCH_PDF',)},
'SAVE_SCREENSHOT': {'type': bool, 'default': True, 'aliases': ('FETCH_SCREENSHOT',)},
'SAVE_DOM': {'type': bool, 'default': True, 'aliases': ('FETCH_DOM',)},

18
archivebox/core/migrations/0022_auto_20231023_2008.py Normal file
View file

@ -0,0 +1,18 @@
# Generated by Django 3.1.14 on 2023-10-23 20:08
from django.db import migrations, models
class Migration(migrations.Migration):
dependencies = [
('core', '0021_auto_20220914_0934'),
]
operations = [
migrations.AlterField(
model_name='archiveresult',
name='extractor',
field=models.CharField(choices=[('favicon', 'favicon'), ('headers', 'headers'), ('singlefile', 'singlefile'), ('pdf', 'pdf'), ('screenshot', 'screenshot'), ('dom', 'dom'), ('wget', 'wget'), ('title', 'title'), ('readability', 'readability'), ('mercury', 'mercury'), ('htmltotext', 'htmltotext'), ('git', 'git'), ('media', 'media'), ('archive_org', 'archive_org')], max_length=32),
),
]

14
archivebox/extractors/__init__.py
View file

@ -33,6 +33,7 @@ from .wget import should_save_wget, save_wget
from .singlefile import should_save_singlefile, save_singlefile
from .readability import should_save_readability, save_readability
from .mercury import should_save_mercury, save_mercury
from .htmltotext import should_save_htmltotext, save_htmltotext
from .pdf import should_save_pdf, save_pdf
from .screenshot import should_save_screenshot, save_screenshot
from .dom import should_save_dom, save_dom
@ -51,15 +52,24 @@ def get_default_archive_methods():
('screenshot', should_save_screenshot, save_screenshot),
('dom', should_save_dom, save_dom),
('wget', should_save_wget, save_wget),
('title', should_save_title, save_title), # keep title and readability below wget and singlefile, as it depends on them
# keep title, readability, and htmltotext below wget and singlefile, as they depend on them
('title', should_save_title, save_title),
('readability', should_save_readability, save_readability),
('mercury', should_save_mercury, save_mercury),
('htmltotext', should_save_htmltotext, save_htmltotext),
('git', should_save_git, save_git),
('media', should_save_media, save_media),
('archive_org', should_save_archive_dot_org, save_archive_dot_org),
]
ARCHIVE_METHODS_INDEXING_PRECEDENCE = [('readability', 1), ('singlefile', 2), ('dom', 3), ('wget', 4)]
ARCHIVE_METHODS_INDEXING_PRECEDENCE = [
('readability', 1),
('mercury', 2),
('htmltotext', 3),
('singlefile', 4),
('dom', 5),
('wget', 6)
]
@enforce_types
def ignore_methods(to_ignore: List[str]):

154
archivebox/extractors/htmltotext.py Normal file
View file

@ -0,0 +1,154 @@
__package__ = 'archivebox.extractors'
from html.parser import HTMLParser
import io
from pathlib import Path
from typing import Optional
from ..config import (
SAVE_HTMLTOTEXT,
TIMEOUT,
VERSION,
)
from ..index.schema import Link, ArchiveResult, ArchiveError
from ..logging_util import TimedProgress
from ..system import atomic_write
from ..util import (
enforce_types,
is_static_file,
)
from .title import get_html
class HTMLTextExtractor(HTMLParser):
TEXT_ATTRS = [
"alt", "cite", "href", "label",
"list", "placeholder", "title", "value"
]
NOTEXT_TAGS = ["script", "style", "template"]
NOTEXT_HREF = ["data:", "javascript:", "#"]
def __init__(self):
super().__init__()
self.output = io.StringIO()
self._tag_stack = []
def _is_text_attr(self, name, value):
if not isinstance(value, str):
return False
if name == "href" and any(map(lambda p: value.startswith(p), self.NOTEXT_HREF)):
return False
if name in self.TEXT_ATTRS:
return True
return False
def _parent_tag(self):
try:
return self._tag_stack[-1]
except IndexError:
return None
def _in_notext_tag(self):
return any([t in self._tag_stack for t in self.NOTEXT_TAGS])
def handle_starttag(self, tag, attrs):
self._tag_stack.append(tag)
# Don't write out attribute values if any ancestor
# is in NOTEXT_TAGS
if self._in_notext_tag():
return
for name, value in attrs:
if self._is_text_attr(name, value):
self.output.write(f"({value.strip()}) ")
def handle_endtag(self, tag):
orig_stack = self._tag_stack.copy()
try:
# Keep popping tags until we find the nearest
# ancestor matching this end tag
while tag != self._tag_stack.pop():
pass
# Write a space after every tag, to ensure that tokens
# in tag text aren't concatenated. This may result in
# excess spaces, which should be ignored by search tokenizers.
if not self._in_notext_tag() and tag not in self.NOTEXT_TAGS:
self.output.write(" ")
except IndexError:
# Got to the top of the stack, but somehow missed
# this end tag -- maybe malformed markup -- restore the
# stack
self._tag_stack = orig_stack
def handle_data(self, data):
# Don't output text data if any ancestor is in NOTEXT_TAGS
if self._in_notext_tag():
return
data = data.lstrip()
len_before_rstrip = len(data)
data = data.rstrip()
spaces_rstripped = len_before_rstrip - len(data)
if data:
self.output.write(data)
if spaces_rstripped:
# Add back a single space if 1 or more
# whitespace characters were stripped
self.output.write(' ')
def __str__(self):
return self.output.getvalue()
@enforce_types
def should_save_htmltotext(link: Link, out_dir: Optional[Path]=None, overwrite: Optional[bool]=False) -> bool:
if is_static_file(link.url):
return False
out_dir = out_dir or Path(link.link_dir)
if not overwrite and (out_dir / 'htmltotext.txt').exists():
return False
return SAVE_HTMLTOTEXT
@enforce_types
def save_htmltotext(link: Link, out_dir: Optional[Path]=None, timeout: int=TIMEOUT) -> ArchiveResult:
"""extract search-indexing-friendly text from an HTML document"""
out_dir = Path(out_dir or link.link_dir)
output = "htmltotext.txt"
timer = TimedProgress(timeout, prefix=' ')
extracted_text = None
try:
extractor = HTMLTextExtractor()
document = get_html(link, out_dir)
if not document:
raise ArchiveError('htmltotext could not find HTML to parse for article text')
extractor.feed(document)
extractor.close()
extracted_text = str(extractor)
atomic_write(str(out_dir / output), extracted_text)
except (Exception, OSError) as err:
status = 'failed'
output = err
cmd = ['(internal) archivebox.extractors.htmltotext', './{singlefile,dom}.html']
finally:
timer.end()
return ArchiveResult(
cmd=cmd,
pwd=str(out_dir),
cmd_version=VERSION,
output=output,
status=status,
index_texts=[extracted_text] if extracted_text else [],
**timer.stats,
)

2
archivebox/index/html.py
View file

@ -143,7 +143,7 @@ def snapshot_icons(snapshot) -> str:
"mercury": "🅼",
"warc": "📦"
}
exclude = ["favicon", "title", "headers", "archive_org"]
exclude = ["favicon", "title", "headers", "htmltotext", "archive_org"]
# Missing specific entry for WARC
extractor_outputs = defaultdict(lambda: None)

2
archivebox/index/schema.py
View file

@ -429,6 +429,7 @@ class Link:
'singlefile_path': 'singlefile.html',
'readability_path': 'readability/content.html',
'mercury_path': 'mercury/content.html',
'htmltotext_path': 'htmltotext.txt',
'pdf_path': 'output.pdf',
'screenshot_path': 'screenshot.png',
'dom_path': 'output.html',
@ -452,6 +453,7 @@ class Link:
'singlefile_path': static_path,
'readability_path': static_path,
'mercury_path': static_path,
'htmltotext_path': static_path,
})
return canonical

107
archivebox/search/utils.py
View file

@ -1,117 +1,23 @@
from html.parser import HTMLParser
import io
from django.db.models import QuerySet
from archivebox.util import enforce_types
from archivebox.config import ANSI, SEARCH_PROCESS_HTML
BLOCK_SIZE = 32768
from archivebox.config import ANSI
def log_index_started(url):
print('{green}[*] Indexing url: {} in the search index {reset}'.format(url, **ANSI))
print( )
class HTMLTextExtractor(HTMLParser):
TEXT_ATTRS = ["alt", "cite", "href", "label", "list", "placeholder", "title", "value"]
NOTEXT_TAGS = ["script", "style", "template"]
NOTEXT_HREF = ["data:", "javascript:", "#"]
def __init__(self):
super().__init__()
self.output = io.StringIO()
self._tag_stack = []
def _is_text_attr(self, name, value):
if not isinstance(value, str):
return False
if name == "href" and any(map(lambda p: value.startswith(p), self.NOTEXT_HREF)):
return False
if name in self.TEXT_ATTRS:
return True
return False
def _parent_tag(self):
try:
return self._tag_stack[-1]
except IndexError:
return None
def _in_notext_tag(self):
return any([t in self._tag_stack for t in self.NOTEXT_TAGS])
def handle_starttag(self, tag, attrs):
self._tag_stack.append(tag)
# Don't write out attribute values if any ancestor
# is in NOTEXT_TAGS
if self._in_notext_tag():
return
for name, value in attrs:
if self._is_text_attr(name, value):
self.output.write(value.strip())
self.output.write(" ")
def handle_endtag(self, tag):
orig_stack = self._tag_stack.copy()
try:
# Keep popping tags until we find the nearest
# ancestor matching this end tag
while tag != self._tag_stack.pop():
pass
# Write a space after every tag, to ensure that tokens
# in tag text aren't concatenated. This may result in
# excess spaces, which should be ignored by search tokenizers.
if not self._in_notext_tag() and tag not in self.NOTEXT_TAGS:
self.output.write(" ")
except IndexError:
# Got to the top of the stack, but somehow missed
# this end tag -- maybe malformed markup -- restore the
# stack
self._tag_stack = orig_stack
def handle_data(self, data):
# Don't output text data if any ancestor is in NOTEXT_TAGS
if self._in_notext_tag():
return
self.output.write(data)
def __str__(self):
return self.output.getvalue()
def _read_all(file: io.TextIOBase) -> str:
return file.read()
def _extract_html_text(file: io.TextIOBase) -> str:
extractor = HTMLTextExtractor()
while (block := file.read(BLOCK_SIZE)):
extractor.feed(block)
else:
extractor.close()
return str(extractor)
def get_file_result_content(res, extra_path, use_pwd=False, *, filter=_read_all):
def get_file_result_content(res, extra_path, use_pwd=False):
if use_pwd:
fpath = f'{res.pwd}/{res.output}'
else:
fpath = f'{res.output}'
if extra_path:
fpath = f'{fpath}/{extra_path}'
with open(fpath, 'r', encoding='utf-8', errors='replace') as file:
data = filter(file)
with open(fpath, 'r', encoding='utf-8') as file:
data = file.read()
if data:
return [data]
return []
@ -132,8 +38,7 @@ def get_indexable_content(results: QuerySet):
if method == 'readability':
return get_file_result_content(res, 'content.txt', use_pwd=True)
elif method == 'singlefile':
filter = _extract_html_text if SEARCH_PROCESS_HTML else _read_all
return get_file_result_content(res, '', use_pwd=True, filter=filter)
return get_file_result_content(res, '', use_pwd=True)
elif method == 'dom':
return get_file_result_content(res, '', use_pwd=True)
elif method == 'wget':

1
tests/fixtures.py
View file

@ -17,6 +17,7 @@ def disable_extractors_dict():
"USE_SINGLEFILE": "false",
"USE_READABILITY": "false",
"USE_MERCURY": "false",
"SAVE_HTMLTOTEXT": "false",
"SAVE_PDF": "false",
"SAVE_SCREENSHOT": "false",
"SAVE_DOM": "false",

8
tests/test_extractors.py
View file

@ -39,6 +39,14 @@ def test_mercury_works(tmp_path, process, disable_extractors_dict):
output_file = archived_item_path / "mercury" / "content.html"
assert output_file.exists()
def test_htmltotext_works(tmp_path, process, disable_extractors_dict):
disable_extractors_dict.update({"SAVE_HTMLTOTEXT": "true"})
add_process = subprocess.run(['archivebox', 'add', 'http://127.0.0.1:8080/static/example.com.html'],
capture_output=True, env=disable_extractors_dict)
archived_item_path = list(tmp_path.glob("archive/**/*"))[0]
output_file = archived_item_path / "htmltotext.txt"
assert output_file.exists()
def test_readability_works_with_wget(tmp_path, process, disable_extractors_dict):
disable_extractors_dict.update({"USE_READABILITY": "true", "USE_WGET": "true"})
add_process = subprocess.run(['archivebox', 'add', 'http://127.0.0.1:8080/static/example.com.html'],