Description

When using strict-server: true, x-oapi-codegen-extra-tags on path parameters are not propagated to the generated RequestObject struct fields. This means validation tags (e.g., validate:"required,alphanum") declared on path parameters in the OpenAPI spec have no effect in the generated strict-server code.

Query parameter tags work correctly — they appear on the generated *Params struct fields. This issue is specific to path parameters in strict-server mode.

Steps to Reproduce

Given this OpenAPI spec:

paths:
  /node/{hostname}/status:
    get:
      operationId: GetNodeStatus
      parameters:
        - name: hostname
          in: path
          required: true
          x-oapi-codegen-extra-tags:
            validate: "required,hostname_rfc1123"
          schema:
            type: string

With config:

output: gen.go
package: gen
generate:
  strict-server: true
  models: true

Expected Behavior

The generated GetNodeStatusRequestObject struct should include the validate tag:

type GetNodeStatusRequestObject struct {
    Hostname string `validate:"required,hostname_rfc1123"`
}

This would allow using a single validation.Struct(request) call in the handler.

Actual Behavior

The generated struct has no extra tags:

type GetNodeStatusRequestObject struct {
    Hostname string
}

The x-oapi-codegen-extra-tags is silently ignored for path parameters in strict-server mode.

Workaround

Manually validate path parameters in each handler using a temporary struct or direct validation calls:

func (n *Node) GetNodeStatus(
    _ context.Context,
    request gen.GetNodeStatusRequestObject,
) (gen.GetNodeStatusResponseObject, error) {
    if errMsg, ok := validation.Var(request.Hostname, "required,hostname_rfc1123"); !ok {
        return gen.GetNodeStatus400JSONResponse{Error: &errMsg}, nil
    }
    // ...
}

Context

This becomes particularly noticeable with resource-oriented APIs where path parameters are common (e.g., /node/{hostname}/network/dns/{interfaceName}). Each handler needs manual validation boilerplate for path params, while query params and request body fields get automatic tag generation.

Version

oapi-codegen v2.4.1