Move into /desktop dir

For eventual merge into maplibre/maputnik repo

desktop/api.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+
+	"github.com/gorilla/mux"
+)
+
+func StyleFileAccessor(filename string) styleFileAccessor {
+	return styleFileAccessor{filename, styleId(filename)}
+}
+
+func styleId(filename string) string {
+	raw, err := ioutil.ReadFile(filename)
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	var spec styleSpec
+	err = json.Unmarshal(raw, &spec)
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	if spec.Id == "" {
+		fmt.Println("No id in style")
+	}
+	return spec.Id
+}
+
+type styleSpec struct {
+	Id string `json:"id"`
+}
+
+// Allows access to a single style file
+type styleFileAccessor struct {
+	filename string
+	id       string
+}
+
+func (fa styleFileAccessor) ListFiles(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	encoder := json.NewEncoder(w)
+	encoder.Encode([]string{fa.id})
+}
+
+func (fa styleFileAccessor) ReadFile(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	_ = vars["styleId"]
+
+	//TODO: Choose right file
+	// right now we just return the single file we know of
+	w.Header().Set("Content-Type", "application/json")
+
+	raw, err := ioutil.ReadFile(fa.filename)
+	if err != nil {
+		log.Panicln(err)
+	}
+	w.Write(raw)
+}
+
+func (fa styleFileAccessor) SaveFile(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	_ = vars["styleId"]
+
+	//TODO: Save to right file
+	w.Header().Set("Content-Type", "application/json")
+
+	body, _ := ioutil.ReadAll(r.Body)
+	var out bytes.Buffer
+	json.Indent(&out, body, "", "  ")
+
+	if err := ioutil.WriteFile(fa.filename, out.Bytes(), 0666); err != nil {
+		log.Fatalf("Can not copy from request to file: %s", err.Error())
+	}
+}