import hashlib import ipaddress import socket from datetime import datetime, timezone from email.utils import parsedate_to_datetime from time import struct_time from typing import Any from urllib.parse import urlparse import bs4 import feedparser import requests from common.data_source.config import INDEX_BATCH_SIZE, REQUEST_TIMEOUT_SECONDS, DocumentSource from common.data_source.interfaces import LoadConnector, PollConnector from common.data_source.models import Document, GenerateDocumentsOutput, SecondsSinceUnixEpoch def _is_private_ip(ip: str) -> bool: try: ip_obj = ipaddress.ip_address(ip) return ip_obj.is_private or ip_obj.is_link_local or ip_obj.is_loopback except ValueError: return False def _validate_url_no_ssrf(url: str) -> None: parsed = urlparse(url) hostname = parsed.hostname if not hostname: raise ValueError("URL must have a valid hostname") try: ip = socket.gethostbyname(hostname) if _is_private_ip(ip): raise ValueError(f"URL resolves to private/internal IP address: {ip}") except socket.gaierror as e: raise ValueError(f"Failed to resolve hostname: {hostname}") from e class RSSConnector(LoadConnector, PollConnector): def __init__(self, feed_url: str, batch_size: int = INDEX_BATCH_SIZE) -> None: self.feed_url = feed_url.strip() self.batch_size = batch_size self.credentials: dict[str, Any] = {} self._cached_feed: Any | None = None def load_credentials(self, credentials: dict[str, Any]) -> dict[str, Any] | None: self.credentials = credentials or {} return None def validate_connector_settings(self) -> None: self._validate_feed_url() if self.batch_size < 1: raise ValueError("batch_size must be greater than 0") self._read_feed(require_entries=True) def load_from_state(self) -> GenerateDocumentsOutput: yield from self._load_entries() def poll_source(self, start: SecondsSinceUnixEpoch, end: SecondsSinceUnixEpoch) -> GenerateDocumentsOutput: yield from self._load_entries(start=start, end=end) def _load_entries( self, start: SecondsSinceUnixEpoch | None = None, end: SecondsSinceUnixEpoch | None = None, ) -> GenerateDocumentsOutput: feed = self._read_feed(require_entries=False) batch: list[Document] = [] for entry in feed.entries: updated_at = self._resolve_entry_time(entry) ts = updated_at.timestamp() if start is not None and ts <= start: continue if end is not None and ts > end: continue batch.append(self._build_document(entry, updated_at)) if len(batch) >= self.batch_size: yield batch batch = [] if batch: yield batch def _validate_feed_url(self) -> None: if not self.feed_url: raise ValueError("feed_url is required") parsed = urlparse(self.feed_url) if parsed.scheme not in {"http", "https"} or not parsed.netloc: raise ValueError("feed_url must be a valid http or https URL") _validate_url_no_ssrf(self.feed_url) def _read_feed(self, require_entries: bool) -> Any: if self._cached_feed is not None: if require_entries and not self._cached_feed.entries: raise ValueError("RSS feed contains no entries") return self._cached_feed self._validate_feed_url() response = requests.get(self.feed_url, timeout=REQUEST_TIMEOUT_SECONDS, allow_redirects=True) response.raise_for_status() final_url = getattr(response, "url", self.feed_url) if final_url != self.feed_url and urlparse(final_url).hostname: _validate_url_no_ssrf(final_url) feed = feedparser.parse(response.content) if getattr(feed, "bozo", False) and not feed.entries: error = getattr(feed, "bozo_exception", None) if error: raise ValueError(f"Failed to parse RSS feed: {error}") from error raise ValueError("Failed to parse RSS feed") if require_entries and not feed.entries: raise ValueError("RSS feed contains no entries") self._cached_feed = feed return feed def _build_document(self, entry: Any, updated_at: datetime) -> Document: link = (entry.get("link") or "").strip() title = (entry.get("title") or "").strip() stable_key = (entry.get("id") or link or title or self.feed_url).strip() semantic_identifier = title or link or stable_key content = self._build_content(entry, semantic_identifier) blob = content.encode("utf-8") metadata: dict[str, Any] = {"feed_url": self.feed_url} if link: metadata["link"] = link if entry.get("author"): metadata["author"] = entry.get("author") categories = [] for tag in entry.get("tags", []): if not isinstance(tag, dict): continue term = tag.get("term") if isinstance(term, str) and term: categories.append(term) if categories: metadata["categories"] = categories return Document( id=f"rss:{hashlib.md5(stable_key.encode('utf-8')).hexdigest()}", source=DocumentSource.RSS, semantic_identifier=semantic_identifier, extension=".txt", blob=blob, doc_updated_at=updated_at, size_bytes=len(blob), metadata=metadata, ) def _build_content(self, entry: Any, semantic_identifier: str) -> str: parts = [semantic_identifier] content_blocks = entry.get("content") or [] for block in content_blocks: value = block.get("value") if isinstance(block, dict) else None normalized = self._normalize_text(value) if normalized: parts.append(normalized) if len(parts) == 1: fallback = entry.get("summary") or entry.get("description") or "" normalized = self._normalize_text(fallback) if normalized: parts.append(normalized) return "\n\n".join(part for part in parts if part).strip() def _resolve_entry_time(self, entry: Any) -> datetime: for field in ("updated_parsed", "published_parsed"): value = entry.get(field) if value: return self._struct_time_to_utc(value) for field in ("updated", "published"): value = entry.get(field) if isinstance(value, str) and value.strip(): try: parsed = parsedate_to_datetime(value) except (TypeError, ValueError, IndexError): continue if parsed.tzinfo is None: parsed = parsed.replace(tzinfo=timezone.utc) return parsed.astimezone(timezone.utc) return datetime.now(timezone.utc) @staticmethod def _normalize_text(value: Any) -> str: if not isinstance(value, str): return "" return bs4.BeautifulSoup(value, "html.parser").get_text("\n", strip=True) @staticmethod def _struct_time_to_utc(value: struct_time | tuple[Any, ...]) -> datetime: dt = datetime(*value[:6], tzinfo=timezone.utc) return dt.astimezone(timezone.utc)