Delegated Routing: Allow to configure methods used by router.

[ajnavarro]

Checklist

• My issue is specific & actionable.
• I am not suggesting a protocol enhancement.
• I have searched on the issue tracker for my issue.

Description

Description

As described here #8997 (review) we need a way to specify methods that a router will use from config.

Actual proposed config file:

{
  "Type": "reframe",
  "Enabled": true,
  "Methods" : ["put-ipns", "get-providers", ...],
  "Parameters": {
    "Endpoint": "https://cid.contact/reframe",
    "Priority": 100
  }
},
{
  "Type": "dht",
  "Enabled": true,
  "Methods" : ["put-ipns", "get-providers", ...],
  "Parameters": {
    "Priority": 200,
    "DHTMode": "dhtclient",
    "TrackFullNetworkDHT": false,
    "Concurrency": 10
  }
}

I suggest making Methods param mandatory to make configuration discoverable. If it is not present or has some wrong methods, an error message will appear when Kubo starts, explaining what is wrong and the available methods for that router. Examples:

we found an error in the configuration. Router type "reframe" does not support "provide" method. Available methods: "get-providers", "get-ipns", "put-ipns"

we found an error in the configuration. "Methods" param is mandatory on "Routers" configuration. Available methods: "get-providers", "get-ipns", "put-ipns"

We can add a generic all method to simplify configuration if all methods are needed.

Implementation

I would say to keep it simple:

• Create a list of available methods per routing type. This will be used to check if provided methods from config are correct.
• Create a new Router wrapper that depending on the provided method list, will call or not the Router underneath. If the method is not allowed to be executed, the wrapper Router will return routing.ErrNotSupported