mirror of
https://github.com/hwchase17/langchain
synced 2024-11-18 09:25:54 +00:00
450 lines
15 KiB
Python
450 lines
15 KiB
Python
"""Loads YouTube transcript."""
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from __future__ import annotations
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import logging
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from enum import Enum
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from pathlib import Path
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from typing import Any, Dict, 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 langchain_core.pydantic_v1 import root_validator
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from langchain_core.pydantic_v1.dataclasses import dataclass
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from langchain_community.document_loaders.base import BaseLoader
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logger = logging.getLogger(__name__)
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SCOPES = ["https://www.googleapis.com/auth/youtube.readonly"]
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@dataclass
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class GoogleApiClient:
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"""Generic Google API Client.
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To use, you should have the ``google_auth_oauthlib,youtube_transcript_api,google``
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python package installed.
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As the google api expects credentials you need to set up a google account and
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register your Service. "https://developers.google.com/docs/api/quickstart/python"
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Example:
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.. code-block:: python
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from langchain_community.document_loaders import GoogleApiClient
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google_api_client = GoogleApiClient(
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service_account_path=Path("path_to_your_sec_file.json")
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)
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"""
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credentials_path: Path = Path.home() / ".credentials" / "credentials.json"
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service_account_path: Path = Path.home() / ".credentials" / "credentials.json"
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token_path: Path = Path.home() / ".credentials" / "token.json"
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def __post_init__(self) -> None:
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self.creds = self._load_credentials()
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@root_validator
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def validate_channel_or_videoIds_is_set(
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cls, values: Dict[str, Any]
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) -> Dict[str, Any]:
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"""Validate that either folder_id or document_ids is set, but not both."""
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if not values.get("credentials_path") and not values.get(
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"service_account_path"
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):
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raise ValueError("Must specify either channel_name or video_ids")
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return values
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def _load_credentials(self) -> Any:
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"""Load credentials."""
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# Adapted from https://developers.google.com/drive/api/v3/quickstart/python
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try:
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from google.auth.transport.requests import Request
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from google.oauth2 import service_account
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from google.oauth2.credentials import Credentials
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from google_auth_oauthlib.flow import InstalledAppFlow
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from youtube_transcript_api import YouTubeTranscriptApi # noqa: F401
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except ImportError:
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raise ImportError(
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"You must run"
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"`pip install --upgrade "
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"google-api-python-client google-auth-httplib2 "
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"google-auth-oauthlib "
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"youtube-transcript-api` "
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"to use the Google Drive loader"
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)
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creds = None
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if self.service_account_path.exists():
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return service_account.Credentials.from_service_account_file(
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str(self.service_account_path)
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)
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if self.token_path.exists():
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creds = Credentials.from_authorized_user_file(str(self.token_path), SCOPES)
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if not creds or not creds.valid:
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if creds and creds.expired and creds.refresh_token:
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creds.refresh(Request())
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else:
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flow = InstalledAppFlow.from_client_secrets_file(
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str(self.credentials_path), SCOPES
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)
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creds = flow.run_local_server(port=0)
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with open(self.token_path, "w") as token:
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token.write(creds.to_json())
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return creds
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ALLOWED_SCHEMAS = {"http", "https"}
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ALLOWED_NETLOCK = {
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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_SCHEMAS:
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return None
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if parsed_url.netloc not in ALLOWED_NETLOCK:
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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 TranscriptFormat(Enum):
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"""Transcript format."""
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TEXT = "text"
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LINES = "lines"
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class YoutubeLoader(BaseLoader):
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"""Load `YouTube` transcripts."""
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def __init__(
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self,
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video_id: str,
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add_video_info: bool = False,
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language: Union[str, Sequence[str]] = "en",
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translation: Optional[str] = None,
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transcript_format: TranscriptFormat = TranscriptFormat.TEXT,
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continue_on_failure: bool = False,
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):
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"""Initialize with YouTube video ID."""
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self.video_id = video_id
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self.add_video_info = add_video_info
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self.language = language
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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 = language
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self.translation = translation
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self.transcript_format = transcript_format
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self.continue_on_failure = continue_on_failure
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@staticmethod
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def extract_video_id(youtube_url: str) -> str:
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"""Extract video id from common YT urls."""
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video_id = _parse_video_id(youtube_url)
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if not video_id:
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raise ValueError(
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f"Could not determine the video ID for the URL {youtube_url}"
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)
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return video_id
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@classmethod
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def from_youtube_url(cls, youtube_url: str, **kwargs: Any) -> YoutubeLoader:
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"""Given youtube URL, load video."""
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video_id = cls.extract_video_id(youtube_url)
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return cls(video_id, **kwargs)
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def load(self) -> List[Document]:
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"""Load documents."""
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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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metadata = {"source": self.video_id}
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if self.add_video_info:
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# Get more video meta info
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# Such as title, description, thumbnail url, publish_date
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video_info = self._get_video_info()
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metadata.update(video_info)
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try:
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transcript_list = YouTubeTranscriptApi.list_transcripts(self.video_id)
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except TranscriptsDisabled:
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return []
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try:
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transcript = transcript_list.find_transcript(self.language)
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except NoTranscriptFound:
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transcript = transcript_list.find_transcript(["en"])
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if self.translation is not None:
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transcript = transcript.translate(self.translation)
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transcript_pieces = transcript.fetch()
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if self.transcript_format == TranscriptFormat.TEXT:
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transcript = " ".join([t["text"].strip(" ") for t in transcript_pieces])
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return [Document(page_content=transcript, metadata=metadata)]
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elif self.transcript_format == TranscriptFormat.LINES:
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return [
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Document(
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page_content=t["text"].strip(" "),
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metadata=dict((key, t[key]) for key in t if key != "text"),
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)
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for t in transcript_pieces
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]
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else:
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raise ValueError("Unknown transcript format.")
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def _get_video_info(self) -> dict:
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"""Get important video information.
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Components are:
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- title
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- description
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- thumbnail url,
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- publish_date
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- channel_author
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- and more.
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"""
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try:
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from pytube import YouTube
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except ImportError:
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raise ImportError(
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"Could not import pytube python package. "
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"Please install it with `pip install pytube`."
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)
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yt = YouTube(f"https://www.youtube.com/watch?v={self.video_id}")
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video_info = {
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"title": yt.title or "Unknown",
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"description": yt.description or "Unknown",
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"view_count": yt.views or 0,
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"thumbnail_url": yt.thumbnail_url or "Unknown",
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"publish_date": yt.publish_date.strftime("%Y-%m-%d %H:%M:%S")
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if yt.publish_date
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else "Unknown",
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"length": yt.length or 0,
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"author": yt.author or "Unknown",
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}
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return video_info
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@dataclass
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class GoogleApiYoutubeLoader(BaseLoader):
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"""Load all Videos from a `YouTube` Channel.
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To use, you should have the ``googleapiclient,youtube_transcript_api``
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python package installed.
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As the service needs a google_api_client, you first have to initialize
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the GoogleApiClient.
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Additionally you have to either provide a channel name or a list of videoids
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"https://developers.google.com/docs/api/quickstart/python"
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Example:
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.. code-block:: python
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from langchain_community.document_loaders import GoogleApiClient
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from langchain_community.document_loaders import GoogleApiYoutubeLoader
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google_api_client = GoogleApiClient(
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service_account_path=Path("path_to_your_sec_file.json")
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)
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loader = GoogleApiYoutubeLoader(
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google_api_client=google_api_client,
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channel_name = "CodeAesthetic"
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)
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load.load()
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"""
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google_api_client: GoogleApiClient
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channel_name: Optional[str] = None
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video_ids: Optional[List[str]] = None
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add_video_info: bool = True
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captions_language: str = "en"
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continue_on_failure: bool = False
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def __post_init__(self) -> None:
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self.youtube_client = self._build_youtube_client(self.google_api_client.creds)
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def _build_youtube_client(self, creds: Any) -> Any:
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try:
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from googleapiclient.discovery import build
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from youtube_transcript_api import YouTubeTranscriptApi # noqa: F401
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except ImportError:
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raise ImportError(
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"You must run"
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"`pip install --upgrade "
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"google-api-python-client google-auth-httplib2 "
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"google-auth-oauthlib "
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"youtube-transcript-api` "
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"to use the Google Drive loader"
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)
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return build("youtube", "v3", credentials=creds)
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@root_validator
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def validate_channel_or_videoIds_is_set(
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cls, values: Dict[str, Any]
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) -> Dict[str, Any]:
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"""Validate that either folder_id or document_ids is set, but not both."""
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if not values.get("channel_name") and not values.get("video_ids"):
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raise ValueError("Must specify either channel_name or video_ids")
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return values
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def _get_transcripe_for_video_id(self, video_id: str) -> str:
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from youtube_transcript_api import NoTranscriptFound, YouTubeTranscriptApi
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transcript_list = YouTubeTranscriptApi.list_transcripts(video_id)
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try:
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transcript = transcript_list.find_transcript([self.captions_language])
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except NoTranscriptFound:
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for available_transcript in transcript_list:
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transcript = available_transcript.translate(self.captions_language)
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continue
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transcript_pieces = transcript.fetch()
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return " ".join([t["text"].strip(" ") for t in transcript_pieces])
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def _get_document_for_video_id(self, video_id: str, **kwargs: Any) -> Document:
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captions = self._get_transcripe_for_video_id(video_id)
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video_response = (
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self.youtube_client.videos()
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.list(
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part="id,snippet",
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id=video_id,
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)
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.execute()
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)
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return Document(
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page_content=captions,
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metadata=video_response.get("items")[0],
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)
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def _get_channel_id(self, channel_name: str) -> str:
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request = self.youtube_client.search().list(
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part="id",
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q=channel_name,
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type="channel",
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maxResults=1, # we only need one result since channel names are unique
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)
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response = request.execute()
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channel_id = response["items"][0]["id"]["channelId"]
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return channel_id
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def _get_document_for_channel(self, channel: str, **kwargs: Any) -> List[Document]:
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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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)
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except ImportError:
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raise ImportError(
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"You must run"
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"`pip install --upgrade "
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"youtube-transcript-api` "
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"to use the youtube loader"
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)
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channel_id = self._get_channel_id(channel)
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request = self.youtube_client.search().list(
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part="id,snippet",
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channelId=channel_id,
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maxResults=50, # adjust this value to retrieve more or fewer videos
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)
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video_ids = []
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while request is not None:
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response = request.execute()
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# Add each video ID to the list
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for item in response["items"]:
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if not item["id"].get("videoId"):
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continue
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meta_data = {"videoId": item["id"]["videoId"]}
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if self.add_video_info:
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item["snippet"].pop("thumbnails")
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meta_data.update(item["snippet"])
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try:
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page_content = self._get_transcripe_for_video_id(
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item["id"]["videoId"]
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)
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video_ids.append(
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Document(
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page_content=page_content,
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metadata=meta_data,
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)
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)
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except (TranscriptsDisabled, NoTranscriptFound) as e:
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if self.continue_on_failure:
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logger.error(
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"Error fetching transscript "
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+ f" {item['id']['videoId']}, exception: {e}"
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)
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else:
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raise e
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pass
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request = self.youtube_client.search().list_next(request, response)
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return video_ids
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def load(self) -> List[Document]:
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"""Load documents."""
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document_list = []
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if self.channel_name:
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document_list.extend(self._get_document_for_channel(self.channel_name))
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elif self.video_ids:
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document_list.extend(
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[
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self._get_document_for_video_id(video_id)
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for video_id in self.video_ids
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]
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)
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else:
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raise ValueError("Must specify either channel_name or video_ids")
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return document_list
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