mirror of
https://github.com/open-webui/open-webui
synced 2024-11-27 06:20:01 +00:00
98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
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import socket
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import urllib.parse
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import validators
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from typing import Union, Sequence, Iterator
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from langchain_community.document_loaders import (
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WebBaseLoader,
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)
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from langchain_core.documents import Document
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from open_webui.constants import ERROR_MESSAGES
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from open_webui.config import ENABLE_RAG_LOCAL_WEB_FETCH
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from open_webui.env import SRC_LOG_LEVELS
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import logging
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log = logging.getLogger(__name__)
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log.setLevel(SRC_LOG_LEVELS["RAG"])
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def validate_url(url: Union[str, Sequence[str]]):
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if isinstance(url, str):
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if isinstance(validators.url(url), validators.ValidationError):
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raise ValueError(ERROR_MESSAGES.INVALID_URL)
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if not ENABLE_RAG_LOCAL_WEB_FETCH:
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# Local web fetch is disabled, filter out any URLs that resolve to private IP addresses
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parsed_url = urllib.parse.urlparse(url)
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# Get IPv4 and IPv6 addresses
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ipv4_addresses, ipv6_addresses = resolve_hostname(parsed_url.hostname)
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# Check if any of the resolved addresses are private
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# This is technically still vulnerable to DNS rebinding attacks, as we don't control WebBaseLoader
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for ip in ipv4_addresses:
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if validators.ipv4(ip, private=True):
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raise ValueError(ERROR_MESSAGES.INVALID_URL)
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for ip in ipv6_addresses:
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if validators.ipv6(ip, private=True):
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raise ValueError(ERROR_MESSAGES.INVALID_URL)
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return True
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elif isinstance(url, Sequence):
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return all(validate_url(u) for u in url)
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else:
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return False
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def resolve_hostname(hostname):
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# Get address information
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addr_info = socket.getaddrinfo(hostname, None)
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# Extract IP addresses from address information
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ipv4_addresses = [info[4][0] for info in addr_info if info[0] == socket.AF_INET]
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ipv6_addresses = [info[4][0] for info in addr_info if info[0] == socket.AF_INET6]
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return ipv4_addresses, ipv6_addresses
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class SafeWebBaseLoader(WebBaseLoader):
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"""WebBaseLoader with enhanced error handling for URLs."""
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def lazy_load(self) -> Iterator[Document]:
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"""Lazy load text from the url(s) in web_path with error handling."""
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for path in self.web_paths:
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try:
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soup = self._scrape(path, bs_kwargs=self.bs_kwargs)
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text = soup.get_text(**self.bs_get_text_kwargs)
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# Build metadata
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metadata = {"source": path}
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if title := soup.find("title"):
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metadata["title"] = title.get_text()
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if description := soup.find("meta", attrs={"name": "description"}):
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metadata["description"] = description.get(
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"content", "No description found."
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)
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if html := soup.find("html"):
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metadata["language"] = html.get("lang", "No language found.")
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yield Document(page_content=text, metadata=metadata)
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except Exception as e:
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# Log the error and continue with the next URL
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log.error(f"Error loading {path}: {e}")
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def get_web_loader(
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url: Union[str, Sequence[str]],
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verify_ssl: bool = True,
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requests_per_second: int = 2,
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):
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# Check if the URL is valid
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if not validate_url(url):
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raise ValueError(ERROR_MESSAGES.INVALID_URL)
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return SafeWebBaseLoader(
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url,
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verify_ssl=verify_ssl,
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requests_per_second=requests_per_second,
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continue_on_failure=True,
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)
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