AWS S3 相同图像，不同大小

Question

当用户将图像上传到我的网站时，我会将不同大小的图像的多个副本保存到 S3。是否可以保存图像的一份副本并使用 URL 变量访问不同的尺寸？

我更喜欢这样的东西：

https://s3-us-west-2.amazonaws.com/img.jpg?size=small
https://s3-us-west-2.amazonaws.com/img.jpg?size=medium
https://s3-us-west-2.amazonaws.com/img.jpg?size=large

与此相反：

https://s3-us-west-2.amazonaws.com/img1.jpg
https://s3-us-west-2.amazonaws.com/img2.jpg
https://s3-us-west-2.amazonaws.com/img3.jpg

我不想下载不必要的大图像。

Answer 1

不可以，您不能使用查询参数访问 S3 上的不同对象（文件）。

就像您自己建议的那样，您必须想出一个命名模式。你的建议是：

https://s3-us-west-2.amazonaws.com/bucketname/<imagename><size>.<ext>
- Example: -
https://s3-us-west-2.amazonaws.com/bucketname/img1.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img2.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img3.jpg

如果你不喜欢这个，还有一个替代方案：

https://s3-us-west-2.amazonaws.com/bucketname/<imagename>/<size>.<ext>

- Example: -
https://s3-us-west-2.amazonaws.com/bucketname/img/1.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img/2.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img/3.jpg
- or named sizes: -
https://s3-us-west-2.amazonaws.com/bucketname/img/small.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img/medium.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img/large.jpg

或者：

https://s3-us-west-2.amazonaws.com/bucketname/<imagename>-<size>.<ext>
- Example: -
https://s3-us-west-2.amazonaws.com/bucketname/img-1.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img-2.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img-3.jpg
- or named sizes: -
https://s3-us-west-2.amazonaws.com/bucketname/img-small.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img-medium.jpg
https://s3-us-west-2.amazonaws.com/bucketname/img-large.jpg

或者，如果您愿意手动设置每个上传对象的内容类型，甚至可以：

https://s3-us-west-2.amazonaws.com/bucketname/<imagename>.<ext>/<size>
- Example with named sizes: -
https://s3-us-west-2.amazonaws.com/bucketname/img.jpg/small
https://s3-us-west-2.amazonaws.com/bucketname/img.jpg/medium
https://s3-us-west-2.amazonaws.com/bucketname/img.jpg/large

如何命名 S3 存储桶中的图像对象并不重要，但您的 Web 应用程序必须知道如何将图像 URL 组合在一起才能链接到所需的格式。

Answer 2

这对于 S3 来说是不可能的（因为 S3 不会计算其他格式，它们只会提供您上传的文件）。但这可以通过https://www.imgix.com实现，它的功能与您所描述的差不多。