Google Maps Reverse Geocode a Coordinate and Discover What Is Around It

arazzo: 1.0.1
info:
  title: Google Maps Reverse Geocode a Coordinate and Discover What Is Around It
  summary: Turn raw coordinates into a street address, then list the points of interest surrounding that point.
  description: >-
    The "where am I and what is here" flow. A device reports a latitude and
    longitude and nothing else; reverse geocoding turns that into a human-readable
    address, a place ID, and a location_type that tells you how precise the fix
    actually was, and a nearby search then describes the surroundings. Note the
    deliberate coordinate remapping between the two steps: the Geocoding API
    returns lat/lng while the Places API expects latitude/longitude, and this
    workflow spells that translation out rather than assuming it. Every step
    spells out its request inline so the flow can be read and executed without
    opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: geocodingApi
  url: ../openapi/google-maps-geocoding-api.yml
  type: openapi
- name: placesApi
  url: ../openapi/google-maps-places-api.yml
  type: openapi
workflows:
- workflowId: reverse-geocode-to-nearby
  summary: Resolve a coordinate to an address and enumerate the places surrounding it.
  description: >-
    Reverse geocodes a latitude/longitude pair into an address and place ID,
    confirms the geocoder returned an OK status, and then runs a distance-ranked
    nearby search anchored on the geocoder's own snapped coordinates.
  inputs:
    type: object
    required:
    - latitude
    - longitude
    - apiKey
    properties:
      latitude:
        type: number
        description: Latitude of the coordinate to reverse geocode.
      longitude:
        type: number
        description: Longitude of the coordinate to reverse geocode.
      apiKey:
        type: string
        description: >-
          Google Maps Platform API key. The Geocoding API takes the key as the
          required `key` query parameter; the Places API takes it as the
          X-Goog-Api-Key header applied by the configured security scheme.
      resultType:
        type: string
        description: >-
          Pipe-separated address types to filter reverse geocoding results by
          (e.g. "street_address|route").
        default: street_address
      language:
        type: string
        description: Language in which to return the geocoding results (e.g. "en").
        default: en
      radiusMeters:
        type: number
        description: Radius in metres of the circle to search for surrounding places.
        default: 500
      includedTypes:
        type: array
        description: Place types to include in the surroundings scan.
        items:
          type: string
        default:
        - restaurant
        - cafe
        - store
      searchFieldMask:
        type: string
        description: Comma-separated fields for the nearby search response.
        default: places.id,places.displayName,places.formattedAddress,places.location,places.primaryType,places.rating
      languageCode:
        type: string
        description: BCP-47 language code for place results (e.g. "en").
        default: en
      regionCode:
        type: string
        description: CLDR region code used to bias place results (e.g. "US").
        default: US
  steps:
  - stepId: reverseGeocode
    description: >-
      Convert the raw coordinate into an address. The location_type output is the
      honest quality signal here - ROOFTOP is an exact fix while APPROXIMATE means
      the address is a neighbourhood-level guess and should be labelled as such.
    operationId: geocode
    parameters:
    - name: latlng
      in: query
      value: "{$inputs.latitude},{$inputs.longitude}"
    - name: result_type
      in: query
      value: $inputs.resultType
    - name: language
      in: query
      value: $inputs.language
    - name: key
      in: query
      value: $inputs.apiKey
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.status == "OK"
      type: jsonpath
    outputs:
      formattedAddress: $response.body#/results/0/formatted_address
      placeId: $response.body#/results/0/place_id
      locationType: $response.body#/results/0/geometry/location_type
      addressTypes: $response.body#/results/0/types
      addressComponents: $response.body#/results/0/address_components
      snappedLat: $response.body#/results/0/geometry/location/lat
      snappedLng: $response.body#/results/0/geometry/location/lng
  - stepId: discoverSurroundings
    description: >-
      List the places around the geocoder's snapped coordinate, ranked by
      distance. The Geocoding API's lat/lng are remapped onto the Places API's
      latitude/longitude circle centre - the two services name these fields
      differently and passing them through unchanged silently yields no results.
    operationId: searchPlacesNearby
    parameters:
    - name: X-Goog-FieldMask
      in: header
      value: $inputs.searchFieldMask
    requestBody:
      contentType: application/json
      payload:
        includedTypes: $inputs.includedTypes
        languageCode: $inputs.languageCode
        regionCode: $inputs.regionCode
        rankPreference: DISTANCE
        maxResultCount: 20
        locationRestriction:
          circle:
            center:
              latitude: $steps.reverseGeocode.outputs.snappedLat
              longitude: $steps.reverseGeocode.outputs.snappedLng
            radius: $inputs.radiusMeters
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      surroundingPlaces: $response.body#/places
      nearestPlaceId: $response.body#/places/0/id
      nearestDisplayName: $response.body#/places/0/displayName/text
      nearestPrimaryType: $response.body#/places/0/primaryType
      nearestFormattedAddress: $response.body#/places/0/formattedAddress
  outputs:
    formattedAddress: $steps.reverseGeocode.outputs.formattedAddress
    placeId: $steps.reverseGeocode.outputs.placeId
    locationType: $steps.reverseGeocode.outputs.locationType
    surroundingPlaces: $steps.discoverSurroundings.outputs.surroundingPlaces
    nearestDisplayName: $steps.discoverSurroundings.outputs.nearestDisplayName