panic when a $ref refers to a local file

[djgilcrease]

So I have my various services split up into their own yaml files and a common.yaml file they they will refer to

common.yaml

openapi: 3.0.3

info:
  version: "v1"
  title: "Common Components"
  description: Common Components used by many endpoints

paths: {}
components:
  ##########################
  # Common Parameters
  ##########################
  parameters:

    InteractionIdParam:
      in: path
      name: interaction_id
      required: true
      schema:
        $ref: "common.yaml#/components/schemas/InteractionId"
  ##########################
  # Common Data Models
  ##########################
  schemas:
    InteractionId:
      description: >-
        The primary Identifier for the call.
      type: string
      format: uuid
      example: "fdb6816a-a281-412f-ae47-a40fc1033e13"

test.yaml

openapi: 3.0.3

info:
  version: "v1"
  title: "Test Service"
  description: The Test Service

paths:
  /v1/test/{interaction_id}/results:
    get:
      summary: Test Service
      description: |-
        Render the test results
      parameters:
        - $ref: "common.yaml#/components/parameters/InteractionIdParam"
      responses:
        "200":
          $ref: "test.yaml#/components/responses/GetTestSuccess"

components:
  schemas:
    TestGetResponse:
      type: object
      properties:
        data:
          type: string

  responses:
    GetTestSuccess:
      description: OK
      content:
        application/json:
          schema:
            $ref: "test.yaml#/components/schemas/TestGetResponse"

so when I run gnostic --resolve-refs --grpc-out=generated/proto/ common.yaml it works fine
when I run gnostic --resolve-refs --grpc-out=generated/proto/ test.yaml I get

gnostic --resolve-refs --grpc-out=generated/proto/ openapi/test.yaml

2023/10/26 12:19:29 Not able to find parameter information for: _ref:"common.yaml#/components/parameters/InteractionIdParam"
level:WARNING  code:"OPERATION"  text:"One of your operations does not have an 'operationId'. gnostic-grpc might produce an incorrect output file."  keys:"paths"  keys:"/v1/test/{interaction_id}/results"  keys:"get"
Errors reading openapi/test.yaml
Plugin error: [file "test.proto" included an unresolvable reference to "test.InteractionIdParam"]

running gnostic --resolve-refs --pb_out=generated/pb/ openapi/test.yaml works fine and when I run gnostic-grpc not as a plugin I get

gnostic-grpc -input ./generated/pb/openapi/test.pb
2023/10/26 12:25:24 Not able to find parameter information for: _ref:"common.yaml#/components/parameters/InteractionIdParam"
2023/10/26 12:25:24 Plugin error: [file "test.proto" included an unresolvable reference to "test.InteractionIdParam"]

when I run the full test.yaml file I get

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x38 pc=0x105050384]

goroutine 1 [running]:
github.com/google/gnostic/surface.(*OpenAPI3Builder).buildFromResponse(0x8?, {0x140002349e0, 0xf}, 0x1f?)
        /Users/devlon.gilcrease/projects/gnostic/surface/model_openapiv3.go:308 +0x114
github.com/google/gnostic/surface.(*OpenAPI3Builder).buildFromResponseOrRef(0x14000169ac8?, {0x140002349e0, 0xf}, 0x14000036ea0?)
        /Users/devlon.gilcrease/projects/gnostic/surface/model_openapiv3.go:292 +0x104
github.com/google/gnostic/surface.(*OpenAPI3Builder).buildFromComponents(0x14000169ac8, 0x140001c2120)
        /Users/devlon.gilcrease/projects/gnostic/surface/model_openapiv3.go:89 +0x3a8
github.com/google/gnostic/surface.(*OpenAPI3Builder).buildFromDocument(0x12c3b2928?, 0x140001b60c0)
        /Users/devlon.gilcrease/projects/gnostic/surface/model_openapiv3.go:61 +0x2c
github.com/google/gnostic/surface.(*OpenAPI3Builder).buildModel(0x14000169ac8, 0x140001b60c0, {0x16b2634cb, 0x18})
        /Users/devlon.gilcrease/projects/gnostic/surface/model_openapiv3.go:51 +0xb4
github.com/google/gnostic/surface.NewModelFromOpenAPI3(0x140001b60c0, {0x16b2634cb, 0x18})
        /Users/devlon.gilcrease/projects/gnostic/surface/model_openapiv3.go:32 +0x50
github.com/google/gnostic/lib.(*pluginCall).perform(0x140000787a0, {0x10521c890?, 0x140001b60c0?}, 0x3, {0x16b2634cb, 0x18}, 0x0, 0x0)
        /Users/devlon.gilcrease/projects/gnostic/lib/gnostic.go:174 +0x378
github.com/google/gnostic/lib.(*Gnostic).performActions(0x1400017a1c0, {0x10521c890?, 0x140001b60c0})
        /Users/devlon.gilcrease/projects/gnostic/lib/gnostic.go:611 +0x234
github.com/google/gnostic/lib.(*Gnostic).Main(0x1400017a1c0)
        /Users/devlon.gilcrease/projects/gnostic/lib/gnostic.go:683 +0x4c8
main.main()
        /Users/devlon.gilcrease/projects/gnostic/gnostic.go:44 +0xb0