Deleting transforms endpoint does not unescape name param

[weeco]

Version & Environment

Redpanda version: (use rpk version): v23.3.5

What went wrong?

I created a transform with name some-transform/name that&requires! encoding and was unable to delete it using:

curl -i -X "DELETE" http://localhost:65193/v1/transforms/some-transform%2Fname%20that%26requires%21%20encoding
HTTP/1.1 404 Not Found
Content-Length: 37
Server: Seastar httpd
Date: Mon, 19 Feb 2024 16:04:42 GMT
Content-Type: application/json

{"message": "Not found", "code": 404}%

What should have happened instead?

It should have unescaped the parameter so that it matches the transform that I created previously.

How to reproduce the issue?

1. Create a transform with a name that contains special characters that require encoding/decoding
2. Try to delete that transform

Additional information

This seems to be a common bug in the admin API. See:

• admin: Decode URL path parameters #9534
• Admin-API: URL Parameters must be unescaped #14034
• Redpanda should properly decode path parameters vs query parameters #16129

curl -s http://localhost:65193/v1/transform | jq .
[
  {
    "name": "test-get-tf",
    "input_topic": "wasm-tfm-create-test-c",
    "output_topics": [
      "wasm-tfm-create-test-d"
    ],
    "status": [
      {
        "node_id": 0,
        "partition": 0,
        "lag": 0,
        "status": "running"
      },
      {
        "node_id": 0,
        "partition": 1,
        "lag": 0,
        "status": "running"
      }
    ],
    "environment": [
      {
        "key": "foo",
        "value": "bar"
      }
    ]
  },
  {
    "name": "some-transform/name that&requires! encoding",
    "input_topic": "wasm-tfm-create-test-c",
    "output_topics": [
      "wasm-tfm-create-test-d"
    ],
    "status": [
      {
        "node_id": 0,
        "partition": 0,
        "lag": 0,
        "status": "running"
      },
      {
        "node_id": 0,
        "partition": 1,
        "lag": 0,
        "status": "running"
      }
    ],
    "environment": [
      {
        "key": "foo",
        "value": "bar"
      }
    ]
  }
]