Google Maps Resolve Two Addresses and Route Between Them

arazzo: 1.0.1
info:
  title: Google Maps Resolve Two Addresses and Route Between Them
  summary: Geocode a start and end address, then compute directions between the resolved place IDs.
  description: >-
    The most common Google Maps Platform integration pattern. Human-typed
    addresses are ambiguous, so this workflow geocodes the origin and the
    destination first, checks that each resolved to a real result, and then
    routes between them using the returned place IDs rather than the raw
    strings. Routing on place IDs removes the geocoding ambiguity that causes
    silently wrong routes. 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: directionsApi
  url: ../openapi/google-maps-directions-api.yml
  type: openapi
workflows:
- workflowId: address-to-route
  summary: Turn two human-readable addresses into a routed trip with distance and duration.
  description: >-
    Forward geocodes both endpoints, confirms each returned an OK status with at
    least one result, and then calls the Directions API with place_id-prefixed
    origin and destination values.
  inputs:
    type: object
    required:
    - originAddress
    - destinationAddress
    - apiKey
    properties:
      originAddress:
        type: string
        description: The starting address to geocode (e.g. "1600 Amphitheatre Parkway, Mountain View, CA").
      destinationAddress:
        type: string
        description: The ending address to geocode (e.g. "1 Ferry Building, San Francisco, CA").
      apiKey:
        type: string
        description: >-
          Google Maps Platform API key. The Geocoding and Directions APIs take
          the key as the required `key` query parameter.
      mode:
        type: string
        description: Travel mode for the route.
        enum:
        - driving
        - walking
        - bicycling
        - transit
        default: driving
      region:
        type: string
        description: ccTLD two-character region code used to bias geocoding results (e.g. "us").
        default: us
      units:
        type: string
        description: Unit system used for the human-readable distance text.
        enum:
        - metric
        - imperial
        default: imperial
      departureTime:
        type: string
        description: >-
          Departure time for traffic-aware driving or transit routing. Use "now"
          or seconds since the Unix epoch.
        default: now
  steps:
  - stepId: geocodeOrigin
    description: >-
      Forward geocode the origin address into coordinates and a stable place ID.
      A non-OK status means the address never resolved and routing must not run.
    operationId: geocode
    parameters:
    - name: address
      in: query
      value: $inputs.originAddress
    - name: region
      in: query
      value: $inputs.region
    - name: key
      in: query
      value: $inputs.apiKey
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.status == "OK"
      type: jsonpath
    outputs:
      originPlaceId: $response.body#/results/0/place_id
      originFormattedAddress: $response.body#/results/0/formatted_address
      originLocationType: $response.body#/results/0/geometry/location_type
      originPartialMatch: $response.body#/results/0/partial_match
  - stepId: geocodeDestination
    description: >-
      Forward geocode the destination address the same way. Inspect the returned
      location_type and partial_match outputs to decide whether the match is
      precise enough to route on.
    operationId: geocode
    parameters:
    - name: address
      in: query
      value: $inputs.destinationAddress
    - name: region
      in: query
      value: $inputs.region
    - name: key
      in: query
      value: $inputs.apiKey
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.status == "OK"
      type: jsonpath
    outputs:
      destinationPlaceId: $response.body#/results/0/place_id
      destinationFormattedAddress: $response.body#/results/0/formatted_address
      destinationLocationType: $response.body#/results/0/geometry/location_type
      destinationPartialMatch: $response.body#/results/0/partial_match
  - stepId: routeBetweenPlaces
    description: >-
      Compute directions between the two resolved places. The Directions API
      accepts a place ID when it is prefixed with "place_id:", which is what
      makes this route reproducible rather than dependent on string matching.
    operationId: getDirections
    parameters:
    - name: origin
      in: query
      value: "place_id:{$steps.geocodeOrigin.outputs.originPlaceId}"
    - name: destination
      in: query
      value: "place_id:{$steps.geocodeDestination.outputs.destinationPlaceId}"
    - name: mode
      in: query
      value: $inputs.mode
    - name: units
      in: query
      value: $inputs.units
    - name: departure_time
      in: query
      value: $inputs.departureTime
    - name: alternatives
      in: query
      value: true
    - name: key
      in: query
      value: $inputs.apiKey
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.status == "OK"
      type: jsonpath
    outputs:
      routeSummary: $response.body#/routes/0/summary
      distanceText: $response.body#/routes/0/legs/0/distance/text
      distanceMeters: $response.body#/routes/0/legs/0/distance/value
      durationText: $response.body#/routes/0/legs/0/duration/text
      durationSeconds: $response.body#/routes/0/legs/0/duration/value
      durationInTrafficText: $response.body#/routes/0/legs/0/duration_in_traffic/text
      overviewPolyline: $response.body#/routes/0/overview_polyline/points
      warnings: $response.body#/routes/0/warnings
      copyrights: $response.body#/routes/0/copyrights
  outputs:
    originPlaceId: $steps.geocodeOrigin.outputs.originPlaceId
    destinationPlaceId: $steps.geocodeDestination.outputs.destinationPlaceId
    distanceText: $steps.routeBetweenPlaces.outputs.distanceText
    durationText: $steps.routeBetweenPlaces.outputs.durationText
    overviewPolyline: $steps.routeBetweenPlaces.outputs.overviewPolyline