137 lines
4.5 KiB
Python
137 lines
4.5 KiB
Python
import logging
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from typing import Any, Dict, Generator, List, Optional, Sequence, Union
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from urllib.parse import parse_qs, urlparse
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from langchain_core.documents import Document
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from open_webui.env import SRC_LOG_LEVELS
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log = logging.getLogger(__name__)
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log.setLevel(SRC_LOG_LEVELS["RAG"])
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ALLOWED_SCHEMES = {"http", "https"}
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ALLOWED_NETLOCS = {
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"youtu.be",
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"m.youtube.com",
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"youtube.com",
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"www.youtube.com",
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"www.youtube-nocookie.com",
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"vid.plus",
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}
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def _parse_video_id(url: str) -> Optional[str]:
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"""Parse a YouTube URL and return the video ID if valid, otherwise None."""
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parsed_url = urlparse(url)
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if parsed_url.scheme not in ALLOWED_SCHEMES:
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return None
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if parsed_url.netloc not in ALLOWED_NETLOCS:
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return None
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path = parsed_url.path
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if path.endswith("/watch"):
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query = parsed_url.query
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parsed_query = parse_qs(query)
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if "v" in parsed_query:
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ids = parsed_query["v"]
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video_id = ids if isinstance(ids, str) else ids[0]
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else:
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return None
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else:
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path = parsed_url.path.lstrip("/")
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video_id = path.split("/")[-1]
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if len(video_id) != 11: # Video IDs are 11 characters long
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return None
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return video_id
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class YoutubeLoader:
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"""Load `YouTube` video transcripts."""
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def __init__(
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self,
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video_id: str,
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language: Union[str, Sequence[str]] = "en",
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proxy_url: Optional[str] = None,
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):
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"""Initialize with YouTube video ID."""
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_video_id = _parse_video_id(video_id)
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self.video_id = _video_id if _video_id is not None else video_id
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self._metadata = {"source": video_id}
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self.proxy_url = proxy_url
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# Ensure language is a list
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if isinstance(language, str):
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self.language = [language]
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else:
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self.language = list(language)
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# Add English as fallback if not already in the list
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if "en" not in self.language:
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self.language.append("en")
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def load(self) -> List[Document]:
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"""Load YouTube transcripts into `Document` objects."""
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try:
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from youtube_transcript_api import (
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NoTranscriptFound,
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TranscriptsDisabled,
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YouTubeTranscriptApi,
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)
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except ImportError:
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raise ImportError(
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'Could not import "youtube_transcript_api" Python package. '
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"Please install it with `pip install youtube-transcript-api`."
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)
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if self.proxy_url:
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youtube_proxies = {
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"http": self.proxy_url,
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"https": self.proxy_url,
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}
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# Don't log complete URL because it might contain secrets
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log.debug(f"Using proxy URL: {self.proxy_url[:14]}...")
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else:
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youtube_proxies = None
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try:
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transcript_list = YouTubeTranscriptApi.list_transcripts(
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self.video_id, proxies=youtube_proxies
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)
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except Exception as e:
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log.exception("Loading YouTube transcript failed")
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return []
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# Try each language in order of priority
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for lang in self.language:
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try:
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transcript = transcript_list.find_transcript([lang])
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log.debug(f"Found transcript for language '{lang}'")
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transcript_pieces: List[Dict[str, Any]] = transcript.fetch()
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transcript_text = " ".join(
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map(
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lambda transcript_piece: transcript_piece.text.strip(" "),
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transcript_pieces,
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)
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)
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return [Document(page_content=transcript_text, metadata=self._metadata)]
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except NoTranscriptFound:
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log.debug(f"No transcript found for language '{lang}'")
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continue
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except Exception as e:
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log.info(f"Error finding transcript for language '{lang}'")
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raise e
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# If we get here, all languages failed
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languages_tried = ", ".join(self.language)
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log.warning(
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f"No transcript found for any of the specified languages: {languages_tried}. Verify if the video has transcripts, add more languages if needed."
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)
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raise NoTranscriptFound(
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f"No transcript found for any supported language. Verify if the video has transcripts, add more languages if needed."
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)
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