feat: introduce streamers that handle the stream and anonymization from github

src/server/routes/file.ts

@@ -0,0 +1,59 @@
+import * as express from "express";
+import AnonymizedFile from "../../core/AnonymizedFile";
+import AnonymousError from "../../core/AnonymousError";
+import { getRepo, handleError } from "./route-utils";
+
+export const router = express.Router();
+
+router.get(
+  "/:repoId/file/:path*",
+  async (req: express.Request, res: express.Response) => {
+    const anonymizedPath = decodeURI(
+      new URL(req.url, `${req.protocol}://${req.hostname}`).pathname.replace(
+        `/${req.params.repoId}/file/`,
+        ""
+      )
+    );
+    if (anonymizedPath.endsWith("/")) {
+      return handleError(
+        new AnonymousError("folder_not_supported", {
+          httpStatus: 404,
+          object: anonymizedPath,
+        }),
+        res
+      );
+    }
+
+    const repo = await getRepo(req, res, {
+      nocheck: false,
+      includeFiles: false,
+    });
+    if (!repo) return;
+
+    try {
+      const f = new AnonymizedFile({
+        repository: repo,
+        anonymizedPath,
+      });
+      if (!f.isFileSupported()) {
+        throw new AnonymousError("file_not_supported", {
+          httpStatus: 403,
+          object: f,
+        });
+      }
+      if (req.query.download) {
+        res.attachment(
+          anonymizedPath.substring(anonymizedPath.lastIndexOf("/") + 1)
+        );
+      }
+      // cache the file for 5min
+      res.header("Cache-Control", "max-age=300");
+      await repo.countView();
+      await f.send(res);
+    } catch (error) {
+      return handleError(error, res, req);
+    }
+  }
+);
+
+export default router;