Add ability to enable static file serving

pkg/webapp/serve.go

@@ -0,0 +1,51 @@
+package webapp
+
+import (
+	"fmt"
+	"github.com/cortezaproject/corteza-server/pkg/app/options"
+	"github.com/go-chi/chi"
+	"net/http"
+	"os"
+	"path"
+	"strings"
+)
+
+func MakeWebappServer(opt options.HTTPServerOpt) func(r chi.Router) {
+	// Serves static files directly from FS
+	return func(r chi.Router) {
+		fileserver := http.FileServer(http.Dir(opt.WebappBaseDir))
+
+		for _, app := range strings.Split(opt.WebappList, ",") {
+			basedir := path.Join(opt.WebappBaseUrl, app)
+			serveConfig(r, basedir, opt.ApiBaseUrl)
+			r.Get(basedir+"*", serveIndex(opt.WebappBaseDir, basedir+"/index.html", fileserver))
+		}
+
+		serveConfig(r, opt.WebappBaseUrl, opt.ApiBaseUrl)
+		r.Get(opt.WebappBaseUrl+"*", serveIndex(opt.WebappBaseDir, opt.WebappBaseUrl+"/index.html", fileserver))
+	}
+}
+
+// Serves index.html in case the requested file isn't found (or some other os.Stat error)
+func serveIndex(assetPath string, indexPath string, serve http.Handler) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		indexPage := path.Join(assetPath, indexPath)
+		requestedPage := path.Join(assetPath, r.URL.Path)
+		_, err := os.Stat(requestedPage)
+
+		if err != nil {
+			http.ServeFile(w, r, indexPage)
+			return
+		}
+		serve.ServeHTTP(w, r)
+	}
+}
+
+func serveConfig(r chi.Router, appUrl, apiBaseUrl string) {
+	r.Get(strings.TrimRight(appUrl, "/")+"/config.js", func(w http.ResponseWriter, r *http.Request) {
+		const line = "window.%sAPI = '%s/%s';\n"
+		_, _ = fmt.Fprintf(w, line, "System", apiBaseUrl, "system")
+		_, _ = fmt.Fprintf(w, line, "Messaging", apiBaseUrl, "messaging")
+		_, _ = fmt.Fprintf(w, line, "Compose", apiBaseUrl, "compose")
+	})
+}