feat(valhalla): allow graphhopper to avoid road classes

Author: philip-cline

lib/scenario-editor/utils/valhalla.js

@@ -3,7 +3,6 @@
 import fetch from 'isomorphic-fetch'
 import {decode as decodePolyline} from 'polyline'
 import {isEqual as coordinatesAreEqual} from '@conveyal/lonlat'
-import qs from 'qs'
 import lineString from 'turf-linestring'
 
 // This can be used for logging line strings to geojson.io URLs for easy
@@ -204,14 +203,27 @@ export function routeWithGraphHopper (points: Array<LatLng>): ?Promise<GraphHopp
   }
   // Use custom url if it exists, otherwise default to the hosted service.
   const GRAPH_HOPPER_URL = process.env.GRAPH_HOPPER_URL || 'https://graphhopper.com/api/1/'
-  const params = {
-    key: process.env.GRAPH_HOPPER_KEY,
-    vehicle: 'car',
-    debug: true,
-    type: 'json'
-  }
-  const locations = points.map(p => (`point=${p.lat},${p.lng}`)).join('&')
+
   return fetch(
-    `${GRAPH_HOPPER_URL}route?${locations}&${qs.stringify(params)}`
+    `${GRAPH_HOPPER_URL}route?key=${process.env.GRAPH_HOPPER_KEY}`,
+    // New custom routing headers
+    {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({
+        'ch.disable': true,
+        custom_model: {
+          'priority': [{
+            'if': 'road_class == MOTORWAY',
+            'multiply_by': 0.1
+          }]
+        },
+        key: process.env.GRAPH_HOPPER_KEY,
+        points: points.map(p => [p.lng, p.lat]),
+        profile: 'car'
+      })
+    }
   ).then(res => res.json())
 }