feat: support rss datasource (#13721)

### What problem does this PR solve?

Supporting public RSS/Atom feed URLs as data sources for RagFlow.

link #12313

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Author: KeJunMao

common/constants.py

@@ -114,6 +114,7 @@ class ParserType(StrEnum):
 class FileSource(StrEnum):
     LOCAL = ""
     KNOWLEDGEBASE = "knowledgebase"
+    RSS = "rss"
     S3 = "s3"
     NOTION = "notion"
     DISCORD = "discord"

common/data_source/__init__.py

@@ -24,6 +24,7 @@
 """
 
 from .blob_connector import BlobStorageConnector
+from .rss_connector import RSSConnector
 from .slack_connector import SlackConnector
 from .gmail_connector import GmailConnector
 from .notion_connector import NotionConnector
@@ -55,6 +56,7 @@
 
 __all__ = [
     "BlobStorageConnector",
+    "RSSConnector",
     "SlackConnector",
     "GmailConnector",
     "NotionConnector",

common/data_source/config.py

@@ -40,6 +40,7 @@ class BlobType(str, Enum):
 
 class DocumentSource(str, Enum):
     """Document sources"""
+    RSS = "rss"
     S3 = "s3"
     NOTION = "notion"
     R2 = "r2"

common/data_source/rss_connector.py

@@ -0,0 +1,208 @@
+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)

pyproject.toml

@@ -31,6 +31,7 @@ dependencies = [
     "editdistance==0.8.1",
     "elasticsearch-dsl==8.12.0",
     "exceptiongroup>=1.3.0,<2.0.0",
+    "feedparser>=6.0.11,<7.0.0",
     "extract-msg>=0.39.0",
     "ffmpeg-python>=0.2.0",
     "flasgger>=0.9.7.1,<0.10.0",

rag/svr/sync_data_source.py

@@ -43,6 +43,7 @@
 from common.config_utils import show_configs
 from common.data_source import (
     BlobStorageConnector,
+    RSSConnector,
     NotionConnector,
     DiscordConnector,
     GoogleDriveConnector,
@@ -243,6 +244,26 @@ class GOOGLE_CLOUD_STORAGE(_BlobLikeBase):
     DEFAULT_BUCKET_TYPE: str = "google_cloud_storage"
 
 
+class RSS(SyncBase):
+    SOURCE_NAME: str = FileSource.RSS
+
+    async def _generate(self, task: dict):
+        self.connector = RSSConnector(
+            feed_url=self.conf["feed_url"],
+            batch_size=self.conf.get("batch_size", INDEX_BATCH_SIZE),
+        )
+        self.connector.load_credentials(self.conf.get("credentials", {}))
+        self.connector.validate_connector_settings()
+
+        if task["reindex"] == "1" or not task["poll_range_start"]:
+            return self.connector.load_from_state()
+
+        return self.connector.poll_source(
+            task["poll_range_start"].timestamp(),
+            datetime.now(timezone.utc).timestamp(),
+        )
+
+
 class Confluence(SyncBase):
     SOURCE_NAME: str = FileSource.CONFLUENCE
 
@@ -1347,6 +1368,7 @@ async def _generate(self, task: dict):
 
 
 func_factory = {
+    FileSource.RSS: RSS,
     FileSource.S3: S3,
     FileSource.R2: R2,
     FileSource.OCI_STORAGE: OCI_STORAGE,