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import datetime
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import hashlib
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import random
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import asyncio
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import string
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import time
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from sqlalchemy import or_, select, delete
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from sqlalchemy.ext.asyncio.session import AsyncSession
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from .database import Codes, engine
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from .depends import IPRateLimit
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from .storage import STORAGE_ENGINE
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from settings import settings
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storage = STORAGE_ENGINE[settings.STORAGE_ENGINE]()
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# 错误IP限制器
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error_ip_limit = IPRateLimit(settings.ERROR_COUNT, settings.ERROR_MINUTE)
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# 上传文件限制器
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upload_ip_limit = IPRateLimit(settings.UPLOAD_COUNT, settings.UPLOAD_MINUTE)
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async def delete_expire_files():
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while True:
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async with AsyncSession(engine, expire_on_commit=False) as s:
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await error_ip_limit.remove_expired_ip()
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await upload_ip_limit.remove_expired_ip()
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query = select(Codes).where(or_(Codes.exp_time < datetime.datetime.now(), Codes.count == 0))
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exps = (await s.execute(query)).scalars().all()
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files = []
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exps_ids = []
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for exp in exps:
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if exp.type != "text":
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files.append(exp.text)
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exps_ids.append(exp.id)
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await storage.delete_files(files)
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query = delete(Codes).where(Codes.id.in_(exps_ids))
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await s.execute(query)
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await s.commit()
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await asyncio.sleep(settings.DELETE_EXPIRE_FILES_INTERVAL * 60)
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async def get_random_num():
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return random.randint(10000, 99999)
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async def get_random_string():
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r_s = string.ascii_letters + string.digits
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return ''.join(random.choice(r_s) for _ in range(5)).upper()
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async def get_code(s: AsyncSession, exp_style):
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if exp_style == 'forever':
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generate = get_random_string
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else:
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generate = get_random_num
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code = await generate()
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while (await s.execute(select(Codes.id).where(Codes.code == code))).scalar():
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code = await generate()
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return str(code)
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async def get_token(ip, code):
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return hashlib.sha256(f"{ip}{code}{int(time.time() / 1000)}000{settings.ADMIN_PASSWORD}".encode()).hexdigest()
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async def get_expire_info(expire_style, expire_value, s):
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now = datetime.datetime.now()
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if expire_value <= 0 or expire_value > 999:
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return True, None, None
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code = await get_code(s, expire_style)
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if expire_style == 'day':
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return False, now + datetime.timedelta(days=expire_value), -1, code
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elif expire_style == 'hour':
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return False, now + datetime.timedelta(hours=expire_value), -1, code
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elif expire_style == 'minute':
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return False, now + datetime.timedelta(minutes=expire_value), -1, code
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elif expire_style == 'forever':
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return False, None, -1, code
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elif expire_style == 'count':
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return False, None, expire_value, code
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else:
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return True, None, None
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