add api endpoints

api/dynamic.go

@@ -0,0 +1,50 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/parkan/go-hauk/config"
+)
+
+type velocityUnit struct {
+	MpsMultiplier float64 `json:"mpsMultiplier"`
+	Unit          string  `json:"unit"`
+}
+
+func (s *Server) handleDynamic(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/javascript; charset=utf-8")
+
+	var velUnit velocityUnit
+	switch s.cfg.VelocityUnit {
+	case config.MilesPerHour:
+		velUnit = velocityUnit{MpsMultiplier: 3.6 * 0.6213712, Unit: "mph"}
+	case config.MetersPerSecond:
+		velUnit = velocityUnit{MpsMultiplier: 1, Unit: "m/s"}
+	default:
+		velUnit = velocityUnit{MpsMultiplier: 3.6, Unit: "km/h"}
+	}
+
+	tileURI, _ := json.Marshal(s.cfg.MapTileURI)
+	attribution, _ := json.Marshal(s.cfg.MapAttribution)
+	defaultZoom, _ := json.Marshal(s.cfg.DefaultZoom)
+	maxZoom, _ := json.Marshal(s.cfg.MaxZoom)
+	maxPoints, _ := json.Marshal(s.cfg.MaxShownPts)
+	velDelta, _ := json.Marshal(s.cfg.VelocityDataPts)
+	trailColor, _ := json.Marshal(s.cfg.TrailColor)
+	velUnitJSON, _ := json.Marshal(velUnit)
+	offlineTimeout, _ := json.Marshal(s.cfg.OfflineTimeout)
+	requestTimeout, _ := json.Marshal(s.cfg.RequestTimeout)
+
+	fmt.Fprintf(w, "var TILE_URI = %s;\n", tileURI)
+	fmt.Fprintf(w, "var ATTRIBUTION = %s;\n", attribution)
+	fmt.Fprintf(w, "var DEFAULT_ZOOM = %s;\n", defaultZoom)
+	fmt.Fprintf(w, "var MAX_ZOOM = %s;\n", maxZoom)
+	fmt.Fprintf(w, "var MAX_POINTS = %s;\n", maxPoints)
+	fmt.Fprintf(w, "var VELOCITY_DELTA_TIME = %s;\n", velDelta)
+	fmt.Fprintf(w, "var TRAIL_COLOR = %s;\n", trailColor)
+	fmt.Fprintf(w, "var VELOCITY_UNIT = %s;\n", velUnitJSON)
+	fmt.Fprintf(w, "var OFFLINE_TIMEOUT = %s;\n", offlineTimeout)
+	fmt.Fprintf(w, "var REQUEST_TIMEOUT = %s;\n", requestTimeout)
+}