Use paulcager/osgridref to translate

.gitignore

@@ -1 +1,2 @@
 node_modules
+.idea/

Dockerfile

@@ -1,9 +1,11 @@
-FROM node:12.15.0
+FROM paulcager/go-base:latest
-WORKDIR /usr/src/app
+
-COPY package*.json ./
+EXPOSE 9090
-RUN npm --version && node --version
+WORKDIR /go/src/osgrid-server
-RUN npm install
+
-COPY . .
+COPY go.mod *.go ./
-EXPOSE 9090
+RUN go install -v ./... && sha256sum /go/bin/osgrid-server
-CMD ["node", "-r", "esm", "index.js" ]
+
+CMD [ "/go/bin/osgrid-server" ]
+
 

README.md

@@ -1,7 +1,7 @@
 # osgrid-server - _Ordnance Survey Grid Ref Converter_
 
-This project implements a simple REST server to expose the excellent https://www.movable-type.co.uk/scripts/latlong-os-gridref.html
+This project implements a simple REST server to allow conversion between Ordnance Survey
-Ordnance Survey grid reference conversion utilities.
+grid references and latitude / longitude.
 
 ## Usage
 
@@ -9,13 +9,13 @@ The easiest way to avoid environmental or Node versioning problems is to start t
 
     docker run -d --rm --name osgrid-server -p 9090:9090 paulcager/osgrid-server
 
-A grid reference may then be converted to a lat /lon:
+A grid reference may then be converted to a lat / lon:
 
-    $ curl http://localhost:9090/gridref/SU3724515505
+    $ curl http://localhost:9090/v4/gridref/SU37241550
-    50.93779289256305,-1.471309033422234
+    {"osGridRef":"SU37241550","easting":437240,"northing":115500,"lat":50.93774069083967,"lon":-1.4713807843405298}
 
 Or a lat/lon converted to a grid reference:
 
-    $ curl http://localhost:9090/latlon/50.9378,-1.4713
+    $ curl http://localhost:9090/v4/latlon/50.9378,-1.4713
-    SU 37245 15505
+    {"osGridRef":"SU37241550","easting":437246,"northing":115507,"lat":50.9378,"lon":-1.4713}
 

go.mod

@@ -0,0 +1,8 @@
+module osgrid-server
+
+go 1.15
+
+require (
+	github.com/paulcager/osgridref v1.0.1
+	github.com/spf13/pflag v1.0.5
+)

go.sum

@@ -0,0 +1,12 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/paulcager/osgridref v1.0.1 h1:/EX0qWi5LU9zjqE6bxIDgXSEJOAJRCqRIXAnZOB3JnI=
+github.com/paulcager/osgridref v1.0.1/go.mod h1:ufyaMOUx5kOvX4naQZy2JxXME4RnN0y7lec+eIaAt2E=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/robertkrimen/otto v0.0.0-20200922221731-ef014fd054ac/go.mod h1:xvqspoSXJTIpemEonrMDFq6XzwHYYgToXWj5eRX1OtY=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/sourcemap.v1 v1.0.5/go.mod h1:2RlvNNSMglmRrcvhfuzp4hQHwOtjxlbjX7UPY/GXb78=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

index.js

@@ -1,27 +0,0 @@
-// Convert between Ordnance Survey grid reference and WGS-84 lat/lon.
-// See https://www.movable-type.co.uk/scripts/latlong-os-gridref.html
-
-import OsGridRef from 'geodesy/osgridref.js';
-import { LatLon } from 'geodesy/osgridref.js';
-const url = require('url');
-const express = require('express');
-
-const app = express();
-
-// Usage: http://server/gridref=osgb-grid-ref
-app.get('/gridref/:ref', (request, response) => {
-        const gridref = OsGridRef.parse(request.params.ref);
-        const wgs84 = gridref.toLatLon();
-        response.send(String(wgs84.lat) + "," + String(wgs84.lon));
-});
-
-// Usage: http://server/latlon=lat,lon
-app.get('/latlon/:latlon', (request, response) => {
-    const parts = request.params.latlon.split(",");
-    const wgs84 = new LatLon(parts[0], parts[1]);
-    const gridref = wgs84.toOsGrid();
-    response.send(gridref.toString());
-});
-
-app.listen(9090, () => console.log('Listening on port 9090'));
-

osgrid-server.go

@@ -0,0 +1,134 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"math"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/paulcager/osgridref"
+	flag "github.com/spf13/pflag"
+)
+
+const (
+	apiVersion = "v4"
+)
+
+var (
+	staticCache time.Duration
+	listenPort  string
+)
+
+func main() {
+	flag.StringVar(&listenPort, "port", ":9090", "Port to listen on")
+	flag.DurationVar(&staticCache, "static-cache-max-age", 1*time.Hour, "If not zero, the max-age property to set in Cache-Control for responses")
+	flag.Parse()
+
+	server := makeHTTPServer(listenPort)
+	log.Fatal(server.ListenAndServe())
+}
+
+type Reply struct {
+	OSGridRef string  `json:"osGridRef"`
+	Easting   int     `json:"easting"`
+	Northing  int     `json:"northing"`
+	Lat       float64 `json:"lat"`
+	Lon       float64 `json:"lon"`
+}
+
+func makeHTTPServer(listenPort string) *http.Server {
+	http.Handle("/"+apiVersion+"/gridref/", makeCachingHandler(1*time.Hour, http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			gridRefStr := r.URL.Path[len("/"+apiVersion+"/gridref/"):]
+			gridRef, err := osgridref.ParseOsGridRef(gridRefStr)
+			if err != nil {
+				handleError(w, r, gridRefStr, err)
+				return
+			}
+
+			lat, lon := gridRef.ToLatLon()
+			handle(w, r, gridRef, lat, lon)
+		})))
+
+	http.Handle("/"+apiVersion+"/latlon/", makeCachingHandler(1*time.Hour, http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			latLonStr := r.URL.Path[len("/"+apiVersion+"/latlon/"):]
+			latLon, err := osgridref.ParseLatLon(latLonStr, 0, osgridref.WGS84)
+			if err != nil {
+				handleError(w, r, latLonStr, err)
+				return
+			}
+
+			gridRef := latLon.ToOsGridRef()
+			handle(w, r, gridRef, latLon.Lat, latLon.Lon)
+		})))
+
+	if !strings.Contains(listenPort, ":") {
+		listenPort = ":" + listenPort
+	}
+
+	log.Println("Starting HTTP server on " + listenPort)
+	s := &http.Server{
+		ReadHeaderTimeout: 20 * time.Second,
+		WriteTimeout:      2 * time.Minute,
+		IdleTimeout:       10 * time.Minute,
+		Handler:           makeLoggingHandler(http.DefaultServeMux),
+		Addr:              listenPort,
+	}
+
+	return s
+}
+
+func handleError(w http.ResponseWriter, _ *http.Request, str string, _ error) {
+	w.WriteHeader(http.StatusBadRequest)
+	fmt.Fprintf(w, "Invalid request: %q\n", str)
+}
+
+func handle(w http.ResponseWriter, _ *http.Request, ref osgridref.OsGridRef, lat float64, lon float64) {
+	reply := Reply{
+		OSGridRef: ref.StringNCompact(8),
+		Easting:   ref.Easting,
+		Northing:  ref.Northing,
+		Lat:       lat,
+		Lon:       lon,
+	}
+
+	w.Header().Add("Content-Type", "application/json")
+	enc := json.NewEncoder(w)
+	enc.SetEscapeHTML(false)
+	err := enc.Encode(reply)
+	if err != nil {
+		log.Printf("Failed to write response: %s", err)
+		w.WriteHeader(http.StatusBadGateway)
+	}
+}
+
+func makeCachingHandler(age time.Duration, h http.Handler) http.Handler {
+	ageSeconds := int64(math.Round(age.Seconds()))
+	if ageSeconds <= 0 {
+		return h
+	}
+
+	header := fmt.Sprintf("public,max-age=%d", ageSeconds)
+	return http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			w.Header().Add("Cache-Control", header)
+			h.ServeHTTP(w, r)
+		})
+}
+
+func makeLoggingHandler(h http.Handler) http.Handler {
+	return http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			start := time.Now()
+			h.ServeHTTP(w, r)
+			end := time.Now()
+
+			uri := r.URL.String()
+			method := r.Method
+			fmt.Printf("%s %s %s %d\n", method, uri, r.RemoteAddr, end.Sub(start).Milliseconds())
+		})
+}

package-lock.json

@@ -1,436 +0,0 @@
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package.json

@@ -1,16 +0,0 @@
-{
-  "name": "osgrid-server",
-  "version": "1.0.0",
-  "description": "OSGB to lat,lng conversion",
-  "main": "index.js",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
-  },
-  "author": "",
-  "license": "ISC",
-  "devDependencies": {
-    "esm": "^3.2.25",
-    "express": "^4.17.1",
-    "geodesy": "^2.2.1"
-  }
-}