Path encoded in share link url is not url-safe

[cesnietor]

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Expected Behavior

URL should redirect and download files without any issues

Current Behavior

returns a not found since the path contains a / on it e.g.

https://play.min.io:9443/api/v1/download-shared-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

Possible Solution

Steps to Reproduce (for bugs)

1. Deploy minio on a kubernetes environment
2. Crete a bucket
3. Add a png, svg or jpg file
4. Click share download
5. URL created adds a /

Context

We recently introduced a change in #3284 which base64 encodes the share link. But when base64 encoding it we don't make sure is url-safe

Regression

Your Environment

• MinIO version used (minio --version): RELEASE.2024-04-18T19-09-19Z
• Server setup and configuration:
• Operating System and version (uname -a):