预签名 url 用于多个文件 boto3

Question

after finding a solution for multiple files I came to know a solution which look like this

response = s3.generate_presigned_post(
        "BUCKET_NAME",
        "uploads/${filename}",
        Fields=None,
        Conditions=[["starts-with", "$key", "uploads/"]],
        ExpiresIn=(10 * 60),
    ) 

so now scenario is I am creating a folder on fly. like here my folder will be like upload/bulk_upload here I will allow user to upload multiple files. so In this code how I will do this? what will ${filename} as files will be dynamic and what is $key in my case? Confuse where I have to change to make this program run according to my wish

Answer 1

what will ${filename} as files will be dynamic

You can't do this. ${filename} can't be dynamic and you must specify it upfront when you generate generate_presigned_post . So you have to run generate_presigned_post for each file you are going to upload.

For example, if you want to upload 100 files of different ${filename} , you have to run 100 generate_presigned_post .

what is $key in my case

$key is a constant. You don't change it. It is literal string $key . Its part of the syntax.