Trailing slash on key is lost

[emil-rb]

Problem

When using a trailing slash in the key the slash gets lost.

s3client = Aws::S3::Client.new(...)
s3client.put_object(key: 'path/with/trailing/slash/', bucket: 'bucket', body: '')

Actual behavior

An empty object with key path/with/trailing/slash is created.

Expected behavior

Create an empty object with key path/with/trailing/slash/ (note the trailing slash).

Use case

The use case for this is s3fs. It uses empty objects with trailing slashes to mark directories. Due to this issue objects created with this sdk are unusable from s3fs.

Debugging

I managed to track down the problematic piece of code.
aws-sdk-core/lib/seahorse/client/plugins/endpoint.rb, line 61:

param.split('/').map{ |value| escape(value) }.join('/')

This split-then-join loses the trailing slash.

[trevorrowe]

Thank you for the bug report and the pointer to the cause. I've put together a fix and added a test to cover the expected behavior. This should go out with the next release shortly.