MM-11420: plugins: compute bundle hash on load (#9172)

* plugins: compute bundle hash on load

Use this hash to bust client caches whenever the plugin bundle changes.

* eliminate redundant pluginHandler

* switch to 64-bit FNV-1a

* Fix test

1 files changed, 3 insertions, 18 deletions

diff --git a/web/static.go b/web/static.go
index 7c1d37252..64d326e24 100644
--- a/web/static.go
+++ b/web/static.go
@@ -29,8 +29,8 @@ func (w *Web) InitStatic() {
 
 		mime.AddExtensionType(".wasm", "application/wasm")
 
-		staticHandler := staticHandler(http.StripPrefix(path.Join(subpath, "static"), http.FileServer(http.Dir(staticDir))))
-		pluginHandler := pluginHandler(w.App.Config, http.StripPrefix(path.Join(subpath, "static", "plugins"), http.FileServer(http.Dir(*w.App.Config().PluginSettings.ClientDirectory))))
+		staticHandler := staticFilesHandler(http.StripPrefix(path.Join(subpath, "static"), http.FileServer(http.Dir(staticDir))))
+		pluginHandler := staticFilesHandler(http.StripPrefix(path.Join(subpath, "static", "plugins"), http.FileServer(http.Dir(*w.App.Config().PluginSettings.ClientDirectory))))
 
 		if *w.App.Config().ServiceSettings.WebserverMode == "gzip" {
 			staticHandler = gziphandler.GzipHandler(staticHandler)
@@ -72,7 +72,7 @@ func root(c *Context, w http.ResponseWriter, r *http.Request) {
 	http.ServeFile(w, r, filepath.Join(staticDir, "root.html"))
 }
 
-func staticHandler(handler http.Handler) http.Handler {
+func staticFilesHandler(handler http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Cache-Control", "max-age=31556926, public")
 		if strings.HasSuffix(r.URL.Path, "/") {
@@ -82,18 +82,3 @@ func staticHandler(handler http.Handler) http.Handler {
 		handler.ServeHTTP(w, r)
 	})
 }
-
-func pluginHandler(config model.ConfigFunc, handler http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		if *config().ServiceSettings.EnableDeveloper {
-			w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
-		} else {
-			w.Header().Set("Cache-Control", "max-age=31556926, public")
-		}
-		if strings.HasSuffix(r.URL.Path, "/") {
-			http.NotFound(w, r)
-			return
-		}
-		handler.ServeHTTP(w, r)
-	})
-}