From 0440dd11e1e2ab3dc991d3c17500ce66e2f32615 Mon Sep 17 00:00:00 2001
From: NatureFreshMilk <naturefreshmilk@github.com>
Date: Wed, 13 Mar 2019 08:55:59 +0100
Subject: [PATCH] api/areas endpoint and config

---
 server/app/config.go |  2 ++
 server/web/areas.go  | 56 ++++++++++++++++++++++++++++++++++++++++++++
 server/web/serve.go  |  4 ++++
 3 files changed, 62 insertions(+)
 create mode 100644 server/web/areas.go

diff --git a/server/app/config.go b/server/app/config.go
index ec771a7..707b73e 100644
--- a/server/app/config.go
+++ b/server/app/config.go
@@ -30,6 +30,7 @@ type MapBlockAccessorConfig struct {
 }
 
 type MapObjectConfig struct {
+	Areas         bool `json:"areas"`
 	Bones         bool `json:"bones"`
 	Protector     bool `json:"protector"`
 	XPProtector   bool `json:"xpprotector"`
@@ -107,6 +108,7 @@ func ParseConfig(filename string) (*Config, error) {
 	}
 
 	mapobjs := MapObjectConfig{
+		Areas:         true,
 		Bones:         true,
 		Protector:     true,
 		XPProtector:   true,
diff --git a/server/web/areas.go b/server/web/areas.go
new file mode 100644
index 0000000..0a08b2d
--- /dev/null
+++ b/server/web/areas.go
@@ -0,0 +1,56 @@
+package web
+
+import (
+	"encoding/json"
+	"mapserver/app"
+	"mapserver/areasparser"
+	"net/http"
+
+	"os"
+	"sync"
+	"time"
+)
+
+type AreasHandler struct {
+	ctx      *app.App
+	cache    []*areasparser.Area
+	lasttime int64
+}
+
+var mutex = &sync.Mutex{}
+
+const AREAS_FILENAME = "areas.dat"
+
+func (h *AreasHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
+	info, err := os.Stat(AREAS_FILENAME)
+	if info == nil || err != nil {
+		// no areas file
+		resp.Header().Add("content-type", "application/json")
+		resp.Write([]byte("[]"))
+		return
+	}
+
+	now := time.Now().Unix()
+	diff := now - h.lasttime
+
+	if diff > 5 {
+		mutex.Lock()
+
+		h.lasttime = now
+		areas, err := areasparser.ParseFile(AREAS_FILENAME)
+
+		if err != nil {
+			resp.WriteHeader(500)
+			resp.Write([]byte(err.Error()))
+			return
+		}
+
+		h.cache = areas
+
+		mutex.Unlock()
+	}
+
+	resp.Header().Add("content-type", "application/json")
+	json.NewEncoder(resp).Encode(h.cache)
+
+}
diff --git a/server/web/serve.go b/server/web/serve.go
index c28043a..88c7dd0 100644
--- a/server/web/serve.go
+++ b/server/web/serve.go
@@ -28,6 +28,10 @@ func Serve(ctx *app.App) {
 	mux.Handle("/api/minetest", &Minetest{ctx: ctx})
 	mux.Handle("/api/mapobjects/", &MapObjects{ctx: ctx})
 
+	if ctx.Config.MapObjects.Areas {
+		mux.Handle("/api/areas", &AreasHandler{ctx: ctx})
+	}
+
 	if ctx.Config.EnablePrometheus {
 		mux.Handle("/metrics", promhttp.Handler())
 	}