// This file tests nsIContentSniffer, introduced in bug 324985

"use strict";

const { HttpServer } = ChromeUtils.importESModule(
  "resource://testing-common/httpd.sys.mjs"
);

const unknownType = "application/x-unknown-content-type";
const sniffedType = "application/x-sniffed";

const snifferCID = Components.ID("{4c93d2db-8a56-48d7-b261-9cf2a8d998eb}");
const snifferContract = "@mozilla.org/network/unittest/contentsniffer;1";
const categoryName = "net-content-sniffers";

var sniffing_enabled = true;

var isNosniff = false;

/**
 * This object is both a factory and an nsIContentSniffer implementation (so, it
 * is de-facto a service)
 */
var sniffer = {
  QueryInterface: ChromeUtils.generateQI(["nsIFactory", "nsIContentSniffer"]),
  createInstance: function sniffer_ci(iid) {
    return this.QueryInterface(iid);
  },

  getMIMETypeFromContent() {
    return sniffedType;
  },
};

var listener = {
  onStartRequest: function test_onStartR(request) {
    try {
      var chan = request.QueryInterface(Ci.nsIChannel);
      if (chan.contentType == unknownType) {
        do_throw("Type should not be unknown!");
      }
      if (isNosniff) {
        if (chan.contentType == sniffedType) {
          do_throw("Sniffer called for X-Content-Type-Options:nosniff");
        }
      } else if (
        sniffing_enabled &&
        this._iteration > 2 &&
        chan.contentType != sniffedType
      ) {
        do_throw(
          "Expecting <" +
            sniffedType +
            "> but got <" +
            chan.contentType +
            "> for " +
            chan.URI.spec
        );
      } else if (!sniffing_enabled && chan.contentType == sniffedType) {
        do_throw(
          "Sniffing not enabled but sniffer called for " + chan.URI.spec
        );
      }
    } catch (e) {
      do_throw("Unexpected exception: " + e);
    }

    throw Components.Exception("", Cr.NS_ERROR_ABORT);
  },

  onDataAvailable: function test_ODA() {
    throw Components.Exception("", Cr.NS_ERROR_UNEXPECTED);
  },

  onStopRequest: function test_onStopR() {
    run_test_iteration(this._iteration);
    do_test_finished();
  },

  _iteration: 1,
};

function makeChan(url) {
  var chan = NetUtil.newChannel({ uri: url, loadUsingSystemPrincipal: true });
  if (sniffing_enabled) {
    chan.loadFlags |= Ci.nsIChannel.LOAD_CALL_CONTENT_SNIFFERS;
  }

  return chan;
}

var httpserv = null;
var urls = null;

function run_test() {
  httpserv = new HttpServer();
  httpserv.registerPathHandler("/nosniff", nosniffHandler);
  httpserv.start(-1);

  urls = [
    // NOTE: First URL here runs without our content sniffer
    "data:" + unknownType + ", Some text",
    "data:" + unknownType + ", Text", // Make sure sniffing works even if we
    // used the unknown content sniffer too
    "data:text/plain, Some more text",
    "http://localhost:" + httpserv.identity.primaryPort,
    "http://localhost:" + httpserv.identity.primaryPort + "/nosniff",
  ];

  Components.manager.nsIComponentRegistrar.registerFactory(
    snifferCID,
    "Unit test content sniffer",
    snifferContract,
    sniffer
  );

  run_test_iteration(1);
}

function nosniffHandler(request, response) {
  response.setHeader("X-Content-Type-Options", "nosniff");
}

function run_test_iteration(index) {
  if (index > urls.length) {
    if (sniffing_enabled) {
      sniffing_enabled = false;
      index = listener._iteration = 1;
    } else {
      do_test_pending();
      httpserv.stop(do_test_finished);
      return; // we're done
    }
  }

  if (sniffing_enabled && index == 2) {
    // Register our sniffer only here
    // This also makes sure that dynamic registration is working
    var catMan = Services.catMan;
    catMan.nsICategoryManager.addCategoryEntry(
      categoryName,
      "unit test",
      snifferContract,
      false,
      true
    );
  } else if (sniffing_enabled && index == 5) {
    isNosniff = true;
  }

  var chan = makeChan(urls[index - 1]);

  listener._iteration++;
  chan.asyncOpen(listener);

  do_test_pending();
}
