findOperationMatches fails on default server `/`

[joeppeeters]

I'm trying to match an incoming request to an operation based on its request path.

Matching appears to be fine as long as there is a server definition. However, in case of an OAS without a server specification (which defaults to / according to the spec) the matching appears to be failing.

"servers" : [{"url" : "/api"}],

 api.findOperationMatches("http://localhost:3000/api/user/john", "get")
 #=> { operation }

but,

"servers": [{"url":"/"}],

 api.findOperationMatches("http://localhost:3000/user/john", "get")
 #=> undefined

I think both situations should succeed. Is this a bug?

[erunion]

This feels like a bug. Do you have an OpenAPI definition you can share that has this issue?

[joeppeeters]

Sure, although the exact spec doesn't really matter. Operation resolution fails for every spec when the server configured as "/"

petstore1.json

petstore1.json with server set to /

{
    "openapi": "3.1.0",
    "info": {
        "version": "1.0.0",
        "title": "Swagger Petstore",
        "license": {
            "name": "MIT",
            "url": "https://opensource.org/licenses/MIT"
        }
    },
    "servers": [
        {
            "url": "/"
        }
    ],
    "paths": {
        "/pets": {
            "get": {
                "summary": "List all pets",
                "operationId": "listPets",
                "tags": [
                    "pets"
                ],
                "parameters": [
                    {
                        "name": "limit",
                        "in": "query",
                        "description": "How many items to return at one time (max 100)",
                        "required": false,
                        "schema": {
                            "type": "integer",
                            "format": "int32"
                        }
                    }
                ],
                "responses": {
                    "200": {
                        "description": "A paged array of pets",
                        "headers": {
                            "x-next": {
                                "description": "A link to the next page of responses",
                                "schema": {
                                    "type": "string"
                                }
                            }
                        },
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/Pets"
                                }
                            }
                        }
                    },
                    "default": {
                        "description": "unexpected error",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/Error"
                                }
                            }
                        }
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "Pet": {
                "type": "object",
                "required": [
                    "id",
                    "name"
                ],
                "properties": {
                    "id": {
                        "type": "integer",
                        "format": "int64"
                    },
                    "name": {
                        "type": "string"
                    },
                    "tag": {
                        "type": "string"
                    }
                }
            },
            "Pets": {
                "type": "array",
                "items": {
                    "$ref": "#/components/schemas/Pet"
                }
            },
            "Error": {
                "type": "object",
                "required": [
                    "code",
                    "message"
                ],
                "properties": {
                    "code": {
                        "type": "integer",
                        "format": "int32"
                    },
                    "message": {
                        "type": "string"
                    }
                }
            }
        }
    }
}

petstore2.json

petstore2.json with server set to /v1

{
    "openapi": "3.1.0",
    "info": {
        "version": "1.0.0",
        "title": "Swagger Petstore",
        "license": {
            "name": "MIT",
            "url": "https://opensource.org/licenses/MIT"
        }
    },
    "servers": [
        {
            "url": "/v1"
        }
    ],
    "paths": {
        "/pets": {
            "get": {
                "summary": "List all pets",
                "operationId": "listPets",
                "tags": [
                    "pets"
                ],
                "parameters": [
                    {
                        "name": "limit",
                        "in": "query",
                        "description": "How many items to return at one time (max 100)",
                        "required": false,
                        "schema": {
                            "type": "integer",
                            "format": "int32"
                        }
                    }
                ],
                "responses": {
                    "200": {
                        "description": "A paged array of pets",
                        "headers": {
                            "x-next": {
                                "description": "A link to the next page of responses",
                                "schema": {
                                    "type": "string"
                                }
                            }
                        },
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/Pets"
                                }
                            }
                        }
                    },
                    "default": {
                        "description": "unexpected error",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/Error"
                                }
                            }
                        }
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "Pet": {
                "type": "object",
                "required": [
                    "id",
                    "name"
                ],
                "properties": {
                    "id": {
                        "type": "integer",
                        "format": "int64"
                    },
                    "name": {
                        "type": "string"
                    },
                    "tag": {
                        "type": "string"
                    }
                }
            },
            "Pets": {
                "type": "array",
                "items": {
                    "$ref": "#/components/schemas/Pet"
                }
            },
            "Error": {
                "type": "object",
                "required": [
                    "code",
                    "message"
                ],
                "properties": {
                    "code": {
                        "type": "integer",
                        "format": "int32"
                    },
                    "message": {
                        "type": "string"
                    }
                }
            }
        }
    }
}

import * as fs from 'node:fs/promises';
const petstoreJSON1 = await fs.readFile('petstore1.json', { encoding: 'utf8' })
const petstoreJSON2 = await fs.readFile('petstore2.json', { encoding: 'utf8' })

import Oas from 'oas';
const petstore1 = await new Oas(petstoreJSON1);
const petstore2 = await new Oas(petstoreJSON2);

console.log(petstore1.findOperation("http://localhost:3000/pets", "get"))
# outputs undefined

console.log(petstore2.findOperation("http://localhost:3000/v1/pets", "get"))
# outputs operation instance