Start working on web server (#2)

* Start working on web server

* Some restructure

* Serving static works

* Fix linter complaint

* Enable local dev

* Static files served fine

* Tidy

pkg/dashboard/api.go

@@ -0,0 +1,55 @@
+package dashboard
+
+import (
+	"embed"
+	"github.com/gin-gonic/gin"
+	log "github.com/sirupsen/logrus"
+	"net/http"
+	"os"
+	"path"
+)
+
+//go:embed static/*
+var staticFS embed.FS
+
+func newRouter(abortWeb ControlChan, data DataLayer) *gin.Engine {
+	api := gin.Default()
+	fs := http.FS(staticFS)
+
+	// local dev speed-up
+	localDevPath := "pkg/dashboard/static"
+	if _, err := os.Stat(localDevPath); err == nil {
+		log.Warnf("Using local development path to serve static files")
+
+		// the root page
+		api.GET("/", func(c *gin.Context) {
+			c.File(path.Join(localDevPath, "index.html"))
+		})
+
+		// serve a directory called static
+		api.GET("/static/*filepath", func(c *gin.Context) {
+			c.File(path.Join(localDevPath, c.Param("filepath")))
+		})
+	} else {
+		// the root page
+		api.GET("/", func(c *gin.Context) {
+			c.FileFromFS("/static/", fs)
+		})
+
+		// serve a directory called static
+		api.GET("/static/*filepath", func(c *gin.Context) {
+			c.FileFromFS(c.Request.URL.Path, fs)
+		})
+	}
+
+	// server shutdown handler
+	api.DELETE("/", func(c *gin.Context) {
+		abortWeb <- struct{}{}
+	})
+
+	api.GET("/api", func(c *gin.Context) {
+		c.IndentedJSON(http.StatusOK, data.ListInstalled())
+	})
+
+	return api
+}