8bcf7615df
AssetFile.preview_url was stored blank on upload, so all thumbnails fell back to placeholders. Make preview_url a SerializerMethodField that signs a TOS GET URL from object_key on read (falls back to stored value, or "" when TOS unconfigured / no key). Verified: presigned URL for an existing object returns HTTP 200 image/png. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
from django.conf import settings
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from rest_framework import serializers
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from .models import Asset, AssetFile
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from .storage import TosStorage
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_tos_storage = None
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def _tos():
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global _tos_storage
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if _tos_storage is None:
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_tos_storage = TosStorage()
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return _tos_storage
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class AssetFileSerializer(serializers.ModelSerializer):
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preview_url = serializers.SerializerMethodField()
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class Meta:
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model = AssetFile
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fields = [
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"id",
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"object_key",
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"bucket",
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"content_type",
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"size_bytes",
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"width",
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"height",
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"duration_ms",
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"preview_url",
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"is_primary",
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]
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read_only_fields = [
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"id",
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"object_key",
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"bucket",
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"content_type",
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"size_bytes",
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"width",
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"height",
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"duration_ms",
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"is_primary",
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]
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def get_preview_url(self, obj):
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# 存储字段优先(如外部已写入绝对 URL);否则用 object_key 实时签发 TOS 预签名 GET URL
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if obj.preview_url:
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return obj.preview_url
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if not obj.object_key or not settings.TOS.get("endpoint"):
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return ""
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try:
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return _tos().presigned_get_url(object_key=obj.object_key)
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except Exception:
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return ""
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class AssetSerializer(serializers.ModelSerializer):
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files = AssetFileSerializer(many=True, read_only=True)
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class Meta:
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model = Asset
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fields = [
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"id",
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"name",
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"asset_type",
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"source",
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"category",
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"description",
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"metadata",
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"is_deleted",
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"files",
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"created_at",
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"updated_at",
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]
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read_only_fields = ["id", "created_at", "updated_at"]
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class AssetUploadSerializer(serializers.Serializer):
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file = serializers.FileField()
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name = serializers.CharField(max_length=255, required=False, allow_blank=True)
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asset_type = serializers.ChoiceField(choices=Asset.Type.choices)
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category = serializers.ChoiceField(choices=Asset.Category.choices, default=Asset.Category.UPLOAD)
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description = serializers.CharField(required=False, allow_blank=True)
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