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index.js
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index.js
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var http = require("http");
var url = require("url");
var fetch = require("node-fetch");
var PHOTON_URL = process.env.PHOTON_URL || "https://photon.komoot.io";
var PORT = process.env.PORT || 8080;
const { translateResults, translateReverseGeocoding } = require("./translate.js");
http
.createServer(function(req, res) {
let parsedUrl = url.parse(req.url, true);
let path = parsedUrl.pathname;
switch (path) {
case "/v1/search":
search(parsedUrl.query, res);
break;
case "/v1/reverse":
reverse(parsedUrl.query, res);
break;
default:
writeError(res, 404, "path not found");
break;
}
})
.listen(PORT);
const OSM_TAG_FILTERS = [
"!amenity:car_sharing",
"!amenity:bike_rental",
"!historic:memorial",
"!boundary",
"!landuse:construction",
"!highway:service",
// exclude unneccessarily detailed public transport nodes
":!stop_position",
":!platform",
"!tunnel:yes",
"!place:county",
"!railway:razed",
"!landuse:military"
];
const DEFAULT_ZOOM_FACTOR = 14;
const DEFAULT_LOCATION_BIAS_SCALE = 0.5;
function search(params, res) {
let bboxParam = null;
let focusParam = null;
let filterParam = null;
let optionalGtfsDataset = "";
if (params["layers"] && params["layers"].includes("bikestation")) {
res.writeHead(200, {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*"
});
res.write(JSON.stringify({ error: "no gtfs", features: [] }));
res.end();
return;
} else if (
params["sources"] &&
params["sources"].split(",").length == 1 &&
params["sources"].split(",")[0].startsWith("gtfs")
) {
res.writeHead(200, {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*"
});
res.write(JSON.stringify({ error: "no gtfs", features: [] }));
res.end();
return;
} else {
filterParam = OSM_TAG_FILTERS.map(e => `&osm_tag=${e}`).join("");
}
if (
params["boundary.rect.min_lat"] &&
params["boundary.rect.max_lat"] &&
params["boundary.rect.min_lon"] &&
params["boundary.rect.max_lon"]
) {
bboxParam = `&bbox=${params["boundary.rect.min_lon"]},${params["boundary.rect.min_lat"]},${
params["boundary.rect.max_lon"]
},${params["boundary.rect.max_lat"]}`;
}
if (params["focus.point.lat"] && params["focus.point.lon"]) {
focusParam = `&lon=${params["focus.point.lon"]}&lat=${params["focus.point.lat"]}`;
focusParam += `&zoom=${DEFAULT_ZOOM_FACTOR}`;
focusParam += `&location_bias_scale=${DEFAULT_LOCATION_BIAS_SCALE}`;
}
let url = `${PHOTON_URL}/api/?q=${encodeURIComponent(params.text)}&lang=${params.lang || "en"}`;
if (bboxParam) {
url += bboxParam;
}
if (focusParam) {
url += focusParam;
}
url += filterParam;
fetch(url)
.then(res => res.json())
.then(json => {
if (!json.features) {
writeError(res, 500, "no result from service");
return;
}
res.writeHead(200, {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*"
});
res.write(JSON.stringify(translateResults(json, optionalGtfsDataset)));
res.end();
})
.catch(err => {
writeError(res, 500, err);
});
}
function reverse(params, res) {
const lat = params["point.lat"];
const lon = params["point.lon"];
if (params["point.lat"] && params["point.lon"]) {
let url = `${PHOTON_URL}/reverse?lon=${params["point.lon"]}&lat=${params["point.lat"]}&lang=${params.lang || "en"}`;
fetch(url)
.then(res => res.json())
.then(json => {
res.writeHead(200, {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*"
});
res.write(JSON.stringify(translateReverseGeocoding(lat, lon, json)));
res.end();
})
.catch(err => {
console.log(err);
writeError(res, 500, err);
});
} else {
writeError(res, 400, "point.lat and point.lon are required");
}
}
function writeError(res, statusCode, errorMessage) {
res.writeHead(statusCode, {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*"
});
res.write(JSON.stringify({ error: errorMessage }));
res.end();
}