Add ability to display notifications other than HTTP errors

cmd/frontend/docx.go

@@ -88,6 +88,6 @@ func UploadDocx(c *b.Config, db *b.DB, s map[string]*Session) http.HandlerFunc {
 			return
 		}
 
-		w.WriteHeader(http.StatusOK)
+		notifyClient(w, "Hochladen erfolgreich!", http.StatusOK)
 	}
 }

cmd/frontend/notifications.go

@@ -0,0 +1,20 @@
+package frontend
+
+import (
+	"fmt"
+	"html/template"
+	"net/http"
+)
+
+func notifyClient(w http.ResponseWriter, message string, status int) {
+	h := w.Header()
+	h.Del("Content-Length")
+	h.Set("Content-Type", "text/html; charset=utf-8")
+	if status >= 400 {
+		h.Set("X-Content-Type-Options", "nosniff")
+	}
+	w.WriteHeader(status)
+
+	safeMsg := template.HTMLEscapeString(message)
+	fmt.Fprintf(w, `<span id="notification-content" hx-swap-oob="true">%s</span>`, safeMsg)
+}

cmd/frontend/pdf.go

@@ -54,6 +54,6 @@ func UploadPDF(c *b.Config, s map[string]*Session) http.HandlerFunc {
 			return
 		}
 
-		w.WriteHeader(http.StatusOK)
+		notifyClient(w, "Hochladen erfolgreich!", http.StatusOK)
 	}
 }