Serve .mjs and .wasm static assets with correct MIME type

2026-06-13 18:59:29 +01:00
parent 179bf8c3d6
commit 907a754d64
1 changed files with 50 additions and 0 deletions
@@ -0,0 +1,50 @@
+package stirling.software.SPDF.config;
+
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.RoutingContext;
+
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.event.Observes;
+
+/**
+ * Forces the correct {@code Content-Type} for ES-module ({@code .mjs}) and WebAssembly ({@code
+ * .wasm}) static assets.
+ *
+ * <p>Quarkus' static-resource handler maps {@code .js} to {@code application/javascript} but does
+ * not recognise the {@code .mjs} extension, so files like the bundled {@code pdf.worker.min-*.mjs}
+ * are served as {@code application/octet-stream}. Browsers enforce strict MIME checking for module
+ * scripts and refuse to execute them, which breaks the PDF.js worker (and in turn stalls the
+ * pdfium/wasm engine that depends on it).
+ *
+ * <p>A low-order Vert.x route runs before the static handler and registers a headers-end hook that
+ * rewrites the {@code Content-Type} just before the response is flushed - overriding whatever the
+ * static handler set, regardless of which handler ultimately serves the file. {@code .wasm} is set
+ * defensively to {@code application/wasm} so {@code WebAssembly.instantiateStreaming} works.
+ */
+@ApplicationScoped
+public class StaticResourceMimeConfig {
+
+    private static final String JS_MODULE_TYPE = "text/javascript; charset=utf-8";
+    private static final String WASM_TYPE = "application/wasm";
+
+    void registerMimeOverrides(@Observes Router router) {
+        router.route().order(-1000).handler(StaticResourceMimeConfig::overrideModuleMime);
+    }
+
+    private static void overrideModuleMime(RoutingContext rc) {
+        String path = rc.request().path();
+        if (path != null) {
+            String contentType = null;
+            if (path.endsWith(".mjs")) {
+                contentType = JS_MODULE_TYPE;
+            } else if (path.endsWith(".wasm")) {
+                contentType = WASM_TYPE;
+            }
+            if (contentType != null) {
+                String resolved = contentType;
+                rc.addHeadersEndHandler(v -> rc.response().headers().set("Content-Type", resolved));
+            }
+        }
+        rc.next();
+    }
+}