mirror of
https://github.com/hwchase17/langchain
synced 2024-11-18 09:25:54 +00:00
127 lines
4.3 KiB
Python
127 lines
4.3 KiB
Python
import json
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import re
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import warnings
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from typing import List, Tuple
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import requests
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from langchain_core.documents import Document
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from langchain_community.document_loaders.base import BaseLoader
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# Pre-compile regular expressions for video ID extraction
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BV_PATTERN = re.compile(r"BV\w+")
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AV_PATTERN = re.compile(r"av[0-9]+")
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class BiliBiliLoader(BaseLoader):
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"""
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Load fetching transcripts from BiliBili videos.
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"""
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def __init__(
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self,
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video_urls: List[str],
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sessdata: str = "",
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bili_jct: str = "",
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buvid3: str = "",
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):
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"""
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Initialize the loader with BiliBili video URLs and authentication cookies.
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if no authentication cookies are provided, the loader can't get transcripts
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and will only fetch videos info.
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Args:
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video_urls (List[str]): List of BiliBili video URLs.
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sessdata (str): SESSDATA cookie value for authentication.
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bili_jct (str): BILI_JCT cookie value for authentication.
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buvid3 (str): BUVI3 cookie value for authentication.
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"""
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self.video_urls = video_urls
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self.credential = None
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try:
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from bilibili_api import video
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except ImportError:
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raise ImportError(
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"requests package not found, please install it with "
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"`pip install bilibili-api-python`"
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)
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if sessdata and bili_jct and buvid3:
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self.credential = video.Credential(
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sessdata=sessdata, bili_jct=bili_jct, buvid3=buvid3
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)
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def load(self) -> List[Document]:
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"""
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Load and return a list of documents containing video transcripts.
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Returns:
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List[Document]: List of Document objects transcripts and metadata.
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"""
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results = []
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for url in self.video_urls:
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transcript, video_info = self._get_bilibili_subs_and_info(url)
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doc = Document(page_content=transcript, metadata=video_info)
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results.append(doc)
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return results
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def _get_bilibili_subs_and_info(self, url: str) -> Tuple[str, dict]:
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"""
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Retrieve video information and transcript for a given BiliBili URL.
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"""
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bvid = BV_PATTERN.search(url)
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try:
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from bilibili_api import sync, video
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except ImportError:
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raise ImportError(
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"requests package not found, please install it with "
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"`pip install bilibili-api-python`"
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)
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if bvid:
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v = video.Video(bvid=bvid.group(), credential=self.credential)
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else:
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aid = AV_PATTERN.search(url)
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if aid:
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v = video.Video(aid=int(aid.group()[2:]), credential=self.credential)
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else:
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raise ValueError(f"Unable to find a valid video ID in URL: {url}")
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video_info = sync(v.get_info())
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video_info.update({"url": url})
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# Return if no credential is provided
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if not self.credential:
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return "", video_info
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# Fetching and processing subtitles
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sub = sync(v.get_subtitle(video_info["cid"]))
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sub_list = sub.get("subtitles", [])
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if sub_list:
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sub_url = sub_list[0].get("subtitle_url", "")
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if not sub_url.startswith("http"):
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sub_url = "https:" + sub_url
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response = requests.get(sub_url)
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if response.status_code == 200:
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raw_sub_titles = json.loads(response.content).get("body", [])
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raw_transcript = " ".join([c["content"] for c in raw_sub_titles])
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raw_transcript_with_meta_info = (
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f"Video Title: {video_info['title']}, "
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f"description: {video_info['desc']}\n\n"
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f"Transcript: {raw_transcript}"
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)
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return raw_transcript_with_meta_info, video_info
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else:
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warnings.warn(
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f"Failed to fetch subtitles for {url}. "
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f"HTTP Status Code: {response.status_code}"
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)
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else:
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warnings.warn(
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f"No subtitles found for video: {url}. Returning empty transcript."
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)
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# Return empty transcript if no subtitles are found
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return "", video_info
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