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24f95f0 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | """
HTML → Markdown conversion with noise removal for Janus crawler.
Strips ads, nav, footer, scripts, styles — keeps the content.
"""
import re
import logging
from typing import List, Dict, Any
from urllib.parse import urljoin
logger = logging.getLogger(__name__)
NOISE_SELECTORS = [
"script",
"style",
"noscript",
"iframe",
"svg",
"canvas",
"nav",
"footer",
"header",
"aside",
".ad",
".ads",
".advertisement",
".ad-container",
".sidebar",
".navigation",
".menu",
".breadcrumb",
".cookie",
".cookie-banner",
".gdpr",
".social-share",
".share-buttons",
".comments",
".comment-section",
".newsletter",
".subscribe",
".popup",
".modal",
".overlay",
"#ad",
"#ads",
"#sidebar",
"#navigation",
"#footer",
".footer",
".header",
]
CONTENT_SELECTORS = [
"article",
"main",
".content",
".article",
".post",
".entry",
"#content",
"#main",
"#article",
".post-content",
".article-body",
".story-body",
]
class ContentProcessor:
"""Convert HTML to clean Markdown with noise removal."""
def process(self, html: str) -> str:
"""Convert HTML to clean Markdown."""
if not html:
return ""
html = self._strip_noise(html)
markdown = self._html_to_markdown(html)
markdown = self._clean_markdown(markdown)
return markdown
def _strip_noise(self, html: str) -> str:
"""Remove noise elements from HTML."""
for selector in NOISE_SELECTORS:
if selector.startswith("."):
pattern = rf'<[^>]*class="[^"]*{re.escape(selector[1:])}[^"]*"[^>]*>.*?</[^>]+>'
html = re.sub(pattern, "", html, flags=re.DOTALL | re.IGNORECASE)
elif selector.startswith("#"):
pattern = (
rf'<[^>]*id="[^"]*{re.escape(selector[1:])}[^"]*"[^>]*>.*?</[^>]+>'
)
html = re.sub(pattern, "", html, flags=re.DOTALL | re.IGNORECASE)
else:
pattern = rf"<{selector}[^>]*>.*?</{selector}>"
html = re.sub(pattern, "", html, flags=re.DOTALL | re.IGNORECASE)
html = re.sub(r"<!--.*?-->", "", html, flags=re.DOTALL)
html = re.sub(r"\s+", " ", html)
return html
def _html_to_markdown(self, html: str) -> str:
"""Convert HTML to Markdown."""
try:
from markdownify import markdownify as md
return md(html, heading_style="ATX", bullets="-", strip=["img"])
except ImportError:
return self._fallback_html_to_text(html)
def _fallback_html_to_text(self, html: str) -> str:
"""Fallback HTML to text conversion without markdownify."""
text = re.sub(r"<br\s*/?>", "\n", html)
text = re.sub(r"</(?:p|div|h[1-6]|li|tr)>", "\n\n", text, flags=re.IGNORECASE)
text = re.sub(
r"<h([1-6])[^>]*>",
lambda m: f"\n\n{'#' * int(m.group(1))} ",
text,
flags=re.IGNORECASE,
)
text = re.sub(r"</?(?:b|strong)>", "**", text, flags=re.IGNORECASE)
text = re.sub(r"</?(?:i|em)>", "*", text, flags=re.IGNORECASE)
text = re.sub(
r'<a[^>]*href="([^"]*)"[^>]*>(.*?)</a>',
r"\2 (\1)",
text,
flags=re.IGNORECASE,
)
text = re.sub(r"<[^>]+>", "", text)
text = re.sub(r" ", " ", text)
text = re.sub(r"&", "&", text)
text = re.sub(r"<", "<", text)
text = re.sub(r">", ">", text)
text = re.sub(r""", '"', text)
text = re.sub(r"'", "'", text)
text = re.sub(r"\n{3,}", "\n\n", text)
return text.strip()
def _clean_markdown(self, markdown: str) -> str:
"""Clean up the markdown output."""
lines = markdown.split("\n")
cleaned = []
prev_blank = False
for line in lines:
line = line.strip()
if not line:
if not prev_blank:
cleaned.append("")
prev_blank = True
else:
cleaned.append(line)
prev_blank = False
result = "\n".join(cleaned).strip()
if len(result) > 50000:
result = (
result[:50000]
+ "\n\n[Content truncated — too long for full extraction]"
)
return result
def extract_links(self, html: str, base_url: str = "") -> List[str]:
"""Extract all links from HTML."""
links = []
pattern = r'<a[^>]*href=["\']([^"\']+)["\'][^>]*>'
for match in re.finditer(pattern, html, re.IGNORECASE):
url = match.group(1)
if url and not url.startswith(("#", "javascript:", "mailto:")):
if base_url and not url.startswith(("http://", "https://")):
url = urljoin(base_url, url)
links.append(url)
return list(set(links))
def extract_metadata(self, html: str, title: str = "") -> Dict[str, Any]:
"""Extract metadata from HTML."""
metadata = {}
if title:
metadata["title"] = title
og_title = re.search(
r'<meta[^>]*property="og:title"[^>]*content="([^"]*)"', html, re.IGNORECASE
)
if og_title:
metadata["og_title"] = og_title.group(1)
og_desc = re.search(
r'<meta[^>]*property="og:description"[^>]*content="([^"]*)"',
html,
re.IGNORECASE,
)
if og_desc:
metadata["og_description"] = og_desc.group(1)
og_image = re.search(
r'<meta[^>]*property="og:image"[^>]*content="([^"]*)"', html, re.IGNORECASE
)
if og_image:
metadata["og_image"] = og_image.group(1)
author = re.search(
r'<meta[^>]*name="author"[^>]*content="([^"]*)"', html, re.IGNORECASE
)
if author:
metadata["author"] = author.group(1)
pub_date = re.search(
r'<meta[^>]*property="article:published_time"[^>]*content="([^"]*)"',
html,
re.IGNORECASE,
)
if pub_date:
metadata["published_at"] = pub_date.group(1)
return metadata
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