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How to enable access to a S3 object in a secure way ?

By default all the objects in an AWS bucket are private. Sometimes we may come across the requirement to share an object (file) present in s3 to others and don’t want to share aws access credentials.

In these scenarios, AWS provides a simple way to provide access by generating a timebound signed URLs using the access credentials. These URLs will be active only for the specified time period and the access will be revoked after that time period. I came across a similar requirement and the solution is shared below.

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Program to change the permission of files present in an Amazon S3 bucket

The program below gives read permission recursively to all the files present in an S3 bucket.