change SOI OSM route, add ancillary file routes

routes.json

@@ -1,5 +1,5 @@
 {
-  "/raster/soi/osm/": {
+  "/soi/osm/": {
     "handlertype": "mosaic",
     "type": "raster",
     "category": ["raster"],

server.js

@@ -7,7 +7,9 @@ const PMTilesHandler = require('./pmtiles_handler');
 
 const routes = require('./routes.json');
 
-const getLocaterPage = require('./wikidata_locater')
+const getLocaterPage = require('./wikidata_locater');
+
+const addSOIAncillaryRoutes = require('./soi_ancillary_routes');
 
 const logger = fastify.log;
 
@@ -90,6 +92,7 @@ function addRoutes() {
       return reply.sendFile("view.css");
     });
   });
+  addSOIAncillaryRoutes(fastify);
   logger.info('done adding routes');
 }
 

soi_ancillary_routes.js

@@ -0,0 +1,19 @@
+const fetch = require('node-fetch');
+
+const ancillaryUrl = 'https://github.com/ramSeraph/opendata/releases/download/soi-ancillary/';
+
+function getCorsProxyFn(targetUrl, request, reply) {
+  return async function(request, reply) {
+    const tResp = await fetch(targetUrl)
+    const stream = tResp.body;
+    return reply.header("Access-Control-Allow-Origin", "*")
+                .send(stream);
+  }
+}
+
+function addSOIAncillaryRoutes(fastify) {
+  fastify.get('/soi/osm/index.geojson', getCorsProxyFn(ancillaryUrl + 'index.geojson'));
+  fastify.get('/soi/india_boundary.geojson', getCorsProxyFn(ancillaryUrl + 'polymap15m_area.geojson'));
+}
+
+module.exports = addSOIAncillaryRoutes;