82 lines
3.1 KiB
Python
82 lines
3.1 KiB
Python
from dataclasses import dataclass
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from typing import BinaryIO
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from urllib.parse import quote, urlparse
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import boto3
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from botocore.config import Config
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from django.conf import settings
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@dataclass(frozen=True)
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class StoredObject:
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bucket: str
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object_key: str
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content_type: str
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size_bytes: int
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class TosStorage:
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def __init__(self) -> None:
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tos = settings.TOS
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self.bucket = tos["bucket"]
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config_kwargs = {
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"signature_version": "s3v4",
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"s3": {"addressing_style": "virtual"},
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}
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try:
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client_config = Config(
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**config_kwargs,
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request_checksum_calculation="when_required",
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response_checksum_validation="when_required",
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)
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except TypeError:
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client_config = Config(**config_kwargs)
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self.client = boto3.client(
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"s3",
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endpoint_url=tos["endpoint"],
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aws_access_key_id=tos["access_key_id"],
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aws_secret_access_key=tos["secret_access_key"],
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region_name=tos.get("region") or "cn-shanghai",
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config=client_config,
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)
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def upload_fileobj(self, *, fileobj: BinaryIO, object_key: str, content_type: str) -> StoredObject:
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fileobj.seek(0, 2)
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size = fileobj.tell()
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fileobj.seek(0)
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self.client.upload_fileobj(
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fileobj,
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self.bucket,
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object_key,
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# object_key 按 asset id 唯一、内容不可变 → 长效强缓存 + immutable:
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# 浏览器/CDN 永不重拉,前端重渲染(背景图重新赋值)也命中缓存,不再"每次生成全页图闪一下重载"。
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ExtraArgs={"ContentType": content_type, "CacheControl": "public, max-age=31536000, immutable"},
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)
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return StoredObject(
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bucket=self.bucket,
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object_key=object_key,
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content_type=content_type,
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size_bytes=size,
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)
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def presigned_get_url(self, *, object_key: str, expires_in: int = 3600) -> str:
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return self.client.generate_presigned_url(
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"get_object",
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Params={"Bucket": self.bucket, "Key": object_key},
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ExpiresIn=expires_in,
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)
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def public_url(self, *, object_key: str, bucket: str | None = None) -> str:
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"""桶公读时的虚拟主机式直链:https://{bucket}.{host}/{key}。
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相比预签名 URL:不签名(省 boto3 客户端/签名开销)、且 URL 稳定可被浏览器/CDN 缓存
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(签名链每次都变、1h 过期,反而打不到缓存)。仅用于公开可读的预览图。
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历史文件的 bucket 仍是火山引擎旧桶，必须用旧域名，不能拼到当前阿里云地址上。"""
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bucket_name = bucket or self.bucket
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endpoint = settings.TOS.get("endpoint") or ""
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legacy_bucket = settings.TOS.get("legacy_bucket") or ""
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legacy_endpoint = settings.TOS.get("legacy_endpoint") or ""
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if legacy_bucket and legacy_endpoint and bucket_name == legacy_bucket:
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endpoint = legacy_endpoint
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host = urlparse(endpoint).netloc
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return f"https://{bucket_name}.{host}/{quote(object_key, safe='/')}"
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