From 0d77518a02b3fe5445e3e3d3c28bf01270722854 Mon Sep 17 00:00:00 2001
From: Lukas Martinelli <me@lukasmartinelli.ch>
Date: Sat, 3 Dec 2016 16:51:47 +0100
Subject: [PATCH] Support saving file

---
 api.go      | 39 ++++++++++++++++++++++++++++++++++-----
 maputnik.go |  6 +++---
 2 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/api.go b/api.go
index 20c6690e..ac149fef 100644
--- a/api.go
+++ b/api.go
@@ -2,48 +2,77 @@ package main
 
 import (
 	"encoding/json"
+	"fmt"
 	"io"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
-	"path/filepath"
 
 	"github.com/gorilla/mux"
 )
 
 func StyleFileAccessor(filename string) styleFileAccessor {
-	file, err := os.Open(filename)
+	file, err := os.OpenFile(filename, os.O_RDWR, 0666)
 	if err != nil {
 		log.Fatalf("Can not access style file: %s", err.Error())
 	}
 
-	return styleFileAccessor{file}
+	return styleFileAccessor{file, styleId(file)}
+}
+
+func styleId(file *os.File) string {
+	raw, err := ioutil.ReadAll(file)
+	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 {
 	file *os.File
+	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{filepath.Base(fa.file.Name())})
+	encoder.Encode([]string{fa.id})
 }
 
 func (fa styleFileAccessor) ReadFile(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
-	_ = vars["filename"]
+	_ = vars["styleId"]
 
 	//TODO: Choose right file
 	// right now we just return the single file we know of
 	w.Header().Set("Content-Type", "application/json")
+	fa.file.Seek(0, 0)
 	if _, err := io.Copy(w, fa.file); err != nil {
 		log.Fatalf("Can not copy from file to request: %s", err.Error())
 	}
 }
 
 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")
 
 	if _, err := io.Copy(fa.file, r.Body); err != nil {
diff --git a/maputnik.go b/maputnik.go
index 4db6396c..a86a417a 100644
--- a/maputnik.go
+++ b/maputnik.go
@@ -39,9 +39,9 @@ func main() {
 			// Allow access to reading and writing file on the local system
 			path, _ := filepath.Abs(filename)
 			accessor := StyleFileAccessor(path)
-			router.Path("/files").Methods("GET").HandlerFunc(accessor.ListFiles)
-			router.Path("/files/{filename}").Methods("GET").HandlerFunc(accessor.ReadFile)
-			router.Path("/files/{filename}").Methods("PUT").HandlerFunc(accessor.SaveFile)
+			router.Path("/styles").Methods("GET").HandlerFunc(accessor.ListFiles)
+			router.Path("/styles/{styleId}").Methods("GET").HandlerFunc(accessor.ReadFile)
+			router.Path("/styles/{styleId}").Methods("PUT").HandlerFunc(accessor.SaveFile)
 
 			// Register websocket to notify we clients about file changes
 			if c.Bool("watch") {