Implement Phase 2 asset storage pipeline

server/src/assets/media-routes.js

@@ -0,0 +1,49 @@
+const express = require("express");
+const { sendImmutableMedia } = require("./streaming");
+
+function createMediaRouter(assetService) {
+  const router = express.Router();
+
+  async function sendMedia(request, response, next, kind) {
+    const version = request.params.version;
+    if (!version.endsWith(".webp")) {
+      response.status(404).json({
+        error: {
+          code: "MEDIA_NOT_FOUND",
+          message: "Asset media version not found",
+        },
+      });
+      return;
+    }
+
+    try {
+      const descriptor = assetService.mediaDescriptor(
+        request.params.assetId,
+        kind,
+        version.slice(0, -".webp".length),
+      );
+      await sendImmutableMedia(assetService, response, descriptor);
+    } catch (error) {
+      if (response.headersSent) {
+        response.destroy(error);
+        return;
+      }
+      next(error);
+    }
+  }
+
+  router.get("/assets/:assetId/display/:version", (request, response, next) =>
+    sendMedia(request, response, next, "display"),
+  );
+  router.get(
+    "/assets/:assetId/thumbnail/:version",
+    (request, response, next) =>
+      sendMedia(request, response, next, "thumbnail"),
+  );
+
+  return router;
+}
+
+module.exports = {
+  createMediaRouter,
+};