generate_presigned_post - Boto3 1.34.74 documentation

Bucket (string) – The name of the bucket to presign the post to. Note that bucket related conditions should not be included in theconditions parameter.

Key (string) – Key name, optionally add ${filename} to the end to attach the submitted filename. Note that key related conditions and fields are filled out for you and should not be included in theFields or Conditions parameter.

Fields (dict) –

A dictionary of prefilled form fields to build on top of. Elements that may be included are acl, Cache-Control, Content-Type, Content-Disposition, Content-Encoding, Expires, success_action_redirect, redirect, success_action_status, and x-amz-meta-.

Note that if a particular element is included in the fields dictionary it will not be automatically added to the conditions list. You must specify a condition for the element as well.

Conditions (list) –

A list of conditions to include in the policy. Each element can be either a list or a structure. For example:

[

{“acl”: “public-read”}, [“content-length-range”, 2, 5], [“starts-with”, “$success_action_redirect”, “”]

]

Conditions that are included may pertain to acl, content-length-range, Cache-Control, Content-Type, Content-Disposition, Content-Encoding, Expires, success_action_redirect, redirect, success_action_status, and/or x-amz-meta-.

Note that if you include a condition, you must specify the a valid value in the fields dictionary as well. A value will not be added automatically to the fields dictionary based on the conditions.

ExpiresIn (int) – The number of seconds the presigned post is valid for.