mirror of
https://github.com/Shu-Ying/main_plugin_farm.git
synced 2026-10-29 21:59:58 +08:00
95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
"""QQ/OneBot头像读取；固定来源、有界缓存和可关闭的异步请求。"""
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import asyncio
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from collections import OrderedDict
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import logging
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import re
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from time import monotonic
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import aiohttp
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logger = logging.getLogger(__name__)
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MAX_BYTES = 2 * 1024 * 1024
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MAX_ENTRIES = 16
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FETCH_TIMEOUT = 2
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async def download_avatar(user_id):
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"""只访问固定腾讯HTTPS端点，不跟随重定向或读取用户提供的URL。"""
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if not re.fullmatch(r'[0-9]{1,20}', user_id):
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return None
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url = f'https://q1.qlogo.cn/g?b=qq&nk={user_id}&s=100'
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timeout = aiohttp.ClientTimeout(total=FETCH_TIMEOUT)
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async with aiohttp.ClientSession(timeout=timeout) as session:
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async with session.get(url, allow_redirects=False) as response:
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response.raise_for_status()
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if response.status != 200:
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return None
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if (response.content_length is not None
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and response.content_length > MAX_BYTES):
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return None
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content = bytearray()
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async for chunk in response.content.iter_chunked(65536):
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if len(content) + len(chunk) > MAX_BYTES:
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return None
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content.extend(chunk)
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return bytes(content) or None
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class AvatarCache:
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"""单事件循环使用；缓存最多16项，同一QQ的并发请求共享下载。"""
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def __init__(self):
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self._cache = OrderedDict()
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self._pending = {}
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self._closed = False
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async def get(self, platform, user_id):
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user_id = str(user_id)
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if (self._closed or platform != 'aiocqhttp'
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or not re.fullmatch(r'[0-9]{1,20}', user_id)):
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return None
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cached = self._cache.get(user_id)
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if cached and cached[0] > monotonic():
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self._cache.move_to_end(user_id)
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return cached[1]
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task = self._pending.get(user_id)
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if task is None:
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if len(self._pending) >= MAX_ENTRIES:
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return None
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task = asyncio.create_task(self._fetch(user_id))
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self._pending[user_id] = task
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return await asyncio.shield(task)
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async def _fetch(self, user_id):
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try:
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content = await asyncio.wait_for(
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download_avatar(user_id), timeout=FETCH_TIMEOUT,
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)
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if (not isinstance(content, bytes) or not content
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or len(content) > MAX_BYTES):
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content = None
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except Exception:
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# 不记录QQ号、完整URL和异常中的潜在身份信息。
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logger.warning('farm astrbot avatar unavailable; using default')
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content = None
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finally:
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self._pending.pop(user_id, None)
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self._cache[user_id] = (
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monotonic() + (300 if content else 30), content,
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)
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self._cache.move_to_end(user_id)
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while len(self._cache) > MAX_ENTRIES:
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self._cache.popitem(last=False)
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return content
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async def close(self):
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self._closed = True
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tasks = list(self._pending.values())
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for task in tasks:
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task.cancel()
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if tasks:
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await asyncio.gather(*tasks, return_exceptions=True)
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self._cache.clear()
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