"use strict";

var express = require("express"),
  request = require("supertest"),
  assert = require("node:assert"),
  url = require("node:url");

describe("res", function () {
  describe(".location(url)", function () {
    it("should set the header", function (done) {
      var app = express();

      app.use(function (req, res) {
        res.location("http://google.com/").end();
      });

      request(app).get("/").expect("Location", "http://google.com/").expect(200, done);
    });

    it("should preserve trailing slashes when not present", function (done) {
      var app = express();

      app.use(function (req, res) {
        res.location("http://google.com").end();
      });

      request(app).get("/").expect("Location", "http://google.com").expect(200, done);
    });

    it('should encode "url"', function (done) {
      var app = express();

      app.use(function (req, res) {
        res.location("https://google.com?q=\u2603 §10").end();
      });

      request(app).get("/").expect("Location", "https://google.com?q=%E2%98%83%20%C2%A710").expect(200, done);
    });

    it("should encode data uri1", function (done) {
      var app = express();
      app.use(function (req, res) {
        res.location("data:text/javascript,export default () => { }").end();
      });

      request(app)
        .get("/")
        .expect("Location", "data:text/javascript,export%20default%20()%20=%3E%20%7B%20%7D")
        .expect(200, done);
    });

    it("should encode data uri2", function (done) {
      var app = express();
      app.use(function (req, res) {
        res.location("data:text/javascript,export default () => { }").end();
      });

      request(app)
        .get("/")
        .expect("Location", "data:text/javascript,export%20default%20()%20=%3E%20%7B%20%7D")
        .expect(200, done);
    });

    it("should consistently handle non-string input: boolean", function (done) {
      var app = express();
      app.use(function (req, res) {
        res.location(true).end();
      });

      request(app).get("/").expect("Location", "true").expect(200, done);
    });

    it("should consistently handle non-string inputs: object", function (done) {
      var app = express();
      app.use(function (req, res) {
        res.location({}).end();
      });

      request(app).get("/").expect("Location", "[object%20Object]").expect(200, done);
    });

    it.todo("should consistently handle non-string inputs: array", function (done) {
      var app = express();
      app.use(function (req, res) {
        res.location([]).end();
      });

      request(app).get("/").expect("Location", "").expect(200, done);
    });

    it.todo("should consistently handle empty string input", function (done) {
      var app = express();
      app.use(function (req, res) {
        res.location("").end();
      });

      request(app).get("/").expect("Location", "").expect(200, done);
    });

    if (typeof URL !== "undefined") {
      it("should accept an instance of URL", function (done) {
        var app = express();

        app.use(function (req, res) {
          res.location(new URL("http://google.com/")).end();
        });

        request(app).get("/").expect("Location", "http://google.com/").expect(200, done);
      });
    }
  });

  describe("location header encoding", function () {
    function createRedirectServerForDomain(domain) {
      var app = express();
      app.use(function (req, res) {
        var host = url.parse(req.query.q, false, true).host;
        // This is here to show a basic check one might do which
        // would pass but then the location header would still be bad
        if (host !== domain) {
          res.status(400).end("Bad host: " + host + " !== " + domain);
        }
        res.location(req.query.q).end();
      });
      return app;
    }

    function testRequestedRedirect(app, inputUrl, expected, expectedHost, done) {
      return (
        request(app)
          // Encode uri because old supertest does not and is required
          // to test older node versions. New supertest doesn't re-encode
          // so this works in both.
          .get("/?q=" + encodeURIComponent(inputUrl))
          .expect("") // No body.
          .expect(200)
          .expect("Location", expected)
          .end(function (err, res) {
            if (err) {
              console.log("headers:", res.headers);
              console.error("error", res.error, err);
              return done(err, res);
            }

            // Parse the hosts from the input URL and the Location header
            var inputHost = url.parse(inputUrl, false, true).host;
            var locationHost = url.parse(res.headers["location"], false, true).host;

            assert.strictEqual(locationHost, expectedHost);

            // Assert that the hosts are the same
            if (inputHost !== locationHost) {
              return done(new Error("Hosts do not match: " + inputHost + " !== " + locationHost));
            }

            return done(null, res);
          })
      );
    }

    it('should not touch already-encoded sequences in "url"', function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(app, "https://google.com?q=%A710", "https://google.com?q=%A710", "google.com", done);
    });

    it("should consistently handle relative urls", function (done) {
      var app = createRedirectServerForDomain(null);
      testRequestedRedirect(app, "/foo/bar", "/foo/bar", null, done);
    });

    it.todo("should not encode urls in such a way that they can bypass redirect allow lists", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(app, "http://google.com\\@apple.com", "http://google.com\\@apple.com", "google.com", done);
    });

    it.todo("should not be case sensitive", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(app, "HTTP://google.com\\@apple.com", "HTTP://google.com\\@apple.com", "google.com", done);
    });

    it.todo("should work with https", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(
        app,
        "https://google.com\\@apple.com",
        "https://google.com\\@apple.com",
        "google.com",
        done,
      );
    });

    it.todo("should correctly encode schemaless paths", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(app, "//google.com\\@apple.com/", "//google.com\\@apple.com/", "google.com", done);
    });

    it.todo("should keep backslashes in the path", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(
        app,
        "https://google.com/foo\\bar\\baz",
        "https://google.com/foo\\bar\\baz",
        "google.com",
        done,
      );
    });

    it.todo("should escape header splitting for old node versions", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(
        app,
        "http://google.com\\@apple.com/%0d%0afoo:%20bar",
        "http://google.com\\@apple.com/%0d%0afoo:%20bar",
        "google.com",
        done,
      );
    });

    it("should encode unicode correctly", function (done) {
      var app = createRedirectServerForDomain(null);
      testRequestedRedirect(app, "/%e2%98%83", "/%e2%98%83", null, done);
    });

    it.todo("should encode unicode correctly even with a bad host", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(
        app,
        "http://google.com\\@apple.com/%e2%98%83",
        "http://google.com\\@apple.com/%e2%98%83",
        "google.com",
        done,
      );
    });

    it("should work correctly despite using deprecated url.parse", function (done) {
      var app = createRedirectServerForDomain("google.com");
      testRequestedRedirect(
        app,
        "https://google.com'.bb.com/1.html",
        "https://google.com'.bb.com/1.html",
        "google.com",
        done,
      );
    });

    it.todo("should encode file uri path", function (done) {
      var app = createRedirectServerForDomain("");
      testRequestedRedirect(app, "file:///etc\\passwd", "file:///etc\\passwd", "", done);
    });
  });
});