File: coopHeaderCommon.sjs

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function handleRequest(request, response) {
  Components.utils.importGlobalProperties(["URLSearchParams"]);
  Components.utils.import("resource://gre/modules/NetUtil.jsm");
  let query = new URLSearchParams(request.queryString);

  response.setHeader("Cross-Origin-Opener-Policy", "same-origin", false);
  response.setHeader("Cross-Origin-Embedder-Policy", "require-corp", false);

  var fileRoot = query.get("fileRoot");

  // Get the desired file
  var file;
  getObjectState("SERVER_ROOT", function(serverRoot) {
    file = serverRoot.getFile(fileRoot);
  });

  // Set up the file streams to read in the file as UTF-8
  let fstream = Components.classes["@mozilla.org/network/file-input-stream;1"].
      createInstance(Components.interfaces.nsIFileInputStream);

  fstream.init(file, -1, 0, 0);

  // Read the file
  let available = fstream.available();
  let data =
    available > 0 ? NetUtil.readInputStreamToString(fstream, available) : "";
  fstream.close();

  response.write(data);
}