zulip/zerver/tests/test_docs.py

import os
import re
from typing import TYPE_CHECKING, Any, Dict, Sequence
from unittest import mock, skipUnless
from urllib.parse import urlsplit

import orjson
from django.conf import settings
from django.test import override_settings
from django.utils.timezone import now as timezone_now

from corporate.models import Customer, CustomerPlan
from zerver.context_processors import get_apps_page_url
from zerver.lib.integrations import CATEGORIES, INTEGRATIONS, META_CATEGORY
from zerver.lib.test_classes import ZulipTestCase
from zerver.lib.test_helpers import HostRequestMock
from zerver.models import Realm, get_realm
from zerver.views.documentation import add_api_url_context

if TYPE_CHECKING:
    from django.test.client import _MonkeyPatchedWSGIResponse as TestHttpResponse


class DocPageTest(ZulipTestCase):
    def get_doc(self, url: str, subdomain: str) -> "TestHttpResponse":
        if url[0:23] == "/integrations/doc-html/":
            return self.client_get(url, subdomain=subdomain, HTTP_X_REQUESTED_WITH="XMLHttpRequest")
        return self.client_get(url, subdomain=subdomain)

    def print_msg_if_error(self, url: str, response: "TestHttpResponse") -> None:  # nocoverage
        if response.status_code == 200:
            return
        print("Error processing URL:", url)
        if response.get("Content-Type") == "application/json":
            content = orjson.loads(response.content)
            print()
            print("======================================================================")
            print("ERROR: {}".format(content.get("msg")))
            print()

    def _is_landing_page(self, url: str) -> bool:
        for prefix in [
            "/api/",
            "/devlogin/",
            "/devtools/",
            "/emails/",
            "/errors/",
            "/help/",
            "/integrations/",
        ]:
            if url.startswith(prefix):
                return False
        return True

    def _check_basic_fetch(
        self,
        *,
        url: str,
        subdomain: str,
        expected_strings: Sequence[str],
        allow_robots: bool,
    ) -> "TestHttpResponse":
        # For whatever reason, we have some urls that don't follow
        # the same policies as the majority of our urls.
        if url.startswith("/integrations/doc-html"):
            allow_robots = True

        if url.startswith("/attribution/"):
            allow_robots = False

        result = self.get_doc(url, subdomain=subdomain)
        self.print_msg_if_error(url, result)
        self.assertEqual(result.status_code, 200)
        for s in expected_strings:
            self.assertIn(s, str(result.content))

        if allow_robots:
            self.assert_not_in_success_response(
                ['<meta name="robots" content="noindex,nofollow" />'], result
            )
        else:
            self.assert_in_success_response(
                ['<meta name="robots" content="noindex,nofollow" />'], result
            )
        return result

    def _test(self, url: str, expected_strings: Sequence[str]) -> None:
        # Test the URL on the root subdomain
        self._check_basic_fetch(
            url=url,
            subdomain="",
            expected_strings=expected_strings,
            allow_robots=False,
        )

        if not self._is_landing_page(url):
            return

        with self.settings(ROOT_DOMAIN_LANDING_PAGE=True):
            # Test the URL on the root subdomain with the landing page setting
            result = self._check_basic_fetch(
                url=url,
                subdomain="",
                expected_strings=expected_strings,
                allow_robots=True,
            )

            # Confirm page has the following HTML elements:
            # (I have no idea why we don't support this for /attribution/.)
            if not url.startswith("/attribution/"):
                self.assert_in_success_response(
                    [
                        "<title>",
                        '<meta name="description" content="',
                        '<meta property="og:title" content="',
                        '<meta property="og:description" content="',
                    ],
                    result,
                )

    def test_zephyr_disallows_robots(self) -> None:
        sample_urls = [
            "/apps/",
            "/case-studies/end-point/",
            "/communities/",
            "/devlogin/",
            "/devtools/",
            "/emails/",
            "/errors/404/",
            "/errors/5xx/",
            "/integrations/",
            "/integrations/",
            "/integrations/bots",
            "/integrations/doc-html/asana",
            "/integrations/doc/github",
            "/team/",
        ]

        for url in sample_urls:
            self._check_basic_fetch(
                url=url,
                subdomain="zephyr",
                expected_strings=[],
                allow_robots=False,
            )

            if self._is_landing_page(url):
                with self.settings(ROOT_DOMAIN_LANDING_PAGE=True):
                    self._check_basic_fetch(
                        url=url,
                        subdomain="zephyr",
                        expected_strings=[],
                        allow_robots=False,
                    )

    def test_api_doc_endpoints(self) -> None:
        # We extract the set of /api/ endpoints to check by parsing
        # the /api/ page sidebar for links starting with /api/.
        api_page_raw = str(self.client_get("/api/").content)
        ENDPOINT_REGEXP = re.compile(r"href=\"/api/\s*(.*?)\"")
        endpoint_list_set = set(re.findall(ENDPOINT_REGEXP, api_page_raw))
        endpoint_list = sorted(endpoint_list_set)

        # We want to make sure our regex captured the actual main page.
        assert "" in endpoint_list

        content = {
            "/api/": "The Zulip API",
            "/api/api-keys": "be careful with it",
            "/api/create-user": "zuliprc-admin",
            "/api/delete-queue": "Delete a previously registered queue",
            "/api/get-events": "dont_block",
            "/api/get-own-user": "does not accept any parameters.",
            "/api/get-stream-id": "The name of the stream to access.",
            "/api/get-streams": "include_public",
            "/api/get-subscriptions": "Get all streams that the user is subscribed to.",
            "/api/get-users": "client_gravatar",
            "/api/installation-instructions": "No download required!",
            "/api/register-queue": "apply_markdown",
            "/api/render-message": "**foo**",
            "/api/send-message": "steal away your hearts",
            "/api/subscribe": "authorization_errors_fatal",
            "/api/unsubscribe": "not_removed",
            "/api/update-message": "propagate_mode",
        }

        """
        We have 110 endpoints as of June 2023.  If the
        way we represent links changes, or the way we put links
        into the main /api page changes, or if somebody simply introduces
        a bug into the test, there is a danger of losing coverage,
        although this is mitigated by other factors such as line
        coverage checks.  For that reason, as well as developer convenience,
        we don't make the check here super precise.
        """
        self.assertGreater(len(endpoint_list), 100)

        for endpoint in endpoint_list:
            url = f"/api/{endpoint}"

            if url in content:
                expected_strings = [content[url]]
                del content[url]
            else:
                # TODO: Just fill out dictionary for all ~110 endpoints
                #       with some specific data from the page.
                expected_strings = ["This is an API doc"]

            # Mock OpenGraph call purely to speed up these tests.
            with mock.patch(
                "zerver.lib.html_to_text.html_to_text", return_value="This is an API doc"
            ) as m:
                self._test(
                    url=url,
                    expected_strings=expected_strings,
                )
                if url != "/api/":
                    m.assert_called()

        # Make sure we exercised all content checks.
        self.assert_length(content, 0)

    def test_api_doc_404_status_codes(self) -> None:
        result = self.client_get(
            "/api/nonexistent-page",
            follow=True,
            HTTP_X_REQUESTED_WITH="XMLHttpRequest",
        )
        self.assertEqual(result.status_code, 404)

        result = self.client_get(
            # This template shouldn't be accessed directly.
            "/api/api-doc-template",
            follow=True,
            HTTP_X_REQUESTED_WITH="XMLHttpRequest",
        )
        self.assertEqual(result.status_code, 404)

    def test_dev_environment_endpoints(self) -> None:
        self._test("/devlogin/", ["Normal users"])
        self._test("/devtools/", ["Useful development URLs"])
        self._test("/emails/", ["manually generate most of the emails by clicking"])

    def test_error_endpoints(self) -> None:
        self._test("/errors/404/", ["Page not found"])
        self._test("/errors/5xx/", ["Internal server error"])

    def test_corporate_portico_endpoints(self) -> None:
        self._test("/team/", ["industry veterans"])
        self._test("/apps/", ["Apps for every platform."])

        self._test("/history/", ["Zulip released as open source!"])
        # Test the i18n version of one of these pages.
        self._test("/en/history/", ["Zulip released as open source!"])
        self._test("/values/", ["designed our company"])
        self._test("/hello/", ["your mission-critical communications with Zulip"])
        self._test("/communities/", ["Open communities directory"])
        self._test("/development-community/", ["Zulip development community"])
        self._test("/features/", ["Beautiful messaging"])
        self._test("/jobs/", ["Work with us"])
        self._test("/self-hosting/", ["Self-host Zulip"])
        self._test("/security/", ["TLS encryption"])
        self._test("/use-cases/", ["Use cases and customer stories"])
        self._test("/why-zulip/", ["Why Zulip?"])
        self._test("/try-zulip/", ["check out the Zulip app"])
        # /for/... pages
        self._test("/for/open-source/", ["for open source projects"])
        self._test("/for/events/", ["for conferences and events"])
        self._test("/for/education/", ["education pricing"])
        self._test("/for/research/", ["for research"])
        self._test("/for/business/", ["Communication efficiency represents"])
        self._test("/for/communities/", ["Zulip for communities"])
        # case-studies
        self._test("/case-studies/tum/", ["Technical University of Munich"])
        self._test("/case-studies/ucsd/", ["UCSD"])
        self._test("/case-studies/rust/", ["Rust programming language"])
        self._test("/case-studies/recurse-center/", ["Recurse Center"])
        self._test("/case-studies/lean/", ["Lean theorem prover"])
        self._test("/case-studies/idrift/", ["Case study: iDrift AS"])
        self._test("/case-studies/end-point/", ["Case study: End Point"])
        self._test("/case-studies/atolio/", ["Case study: Atolio"])
        self._test("/case-studies/asciidoctor/", ["Case study: Asciidoctor"])

    def test_oddball_attributions_page(self) -> None:
        # Look elsewhere in the code--this page never allows robots nor does
        # it provide og data.
        self._test("/attribution/", ["Website attributions"])

    def test_open_organizations_endpoint(self) -> None:
        zulip_dev_info = ["Zulip Dev", "great for testing!"]

        result = self.client_get("/communities/")
        self.assert_not_in_success_response(zulip_dev_info, result)

        realm = get_realm("zulip")
        realm.want_advertise_in_communities_directory = True
        realm.save()
        self._test("/communities/", ["Open communities directory", *zulip_dev_info])

    def test_integration_doc_endpoints(self) -> None:
        self._test(
            "/integrations/",
            expected_strings=[
                "native integrations.",
                "And hundreds more through",
                "Zapier",
                "IFTTT",
            ],
        )

        for integration in INTEGRATIONS:
            url = f"/integrations/doc-html/{integration}"
            self._test(url, expected_strings=[])

        result = self.client_get(
            "/integrations/doc-html/nonexistent_integration",
            follow=True,
            HTTP_X_REQUESTED_WITH="XMLHttpRequest",
        )
        self.assertEqual(result.status_code, 404)

    def test_integration_pages_open_graph_metadata(self) -> None:
        og_description = '<meta property="og:description" content="Zulip comes with over'

        # Test a particular integration page
        url = "/integrations/doc/github"
        title = '<meta property="og:title" content="GitHub | Zulip integrations" />'
        description = '<meta property="og:description" content="Zulip comes with over'
        self._test(url, [title, description])

        # Test category pages
        for category in CATEGORIES:
            url = f"/integrations/{category}"
            if category in META_CATEGORY:
                title = f"<title>{CATEGORIES[category]} | Zulip integrations</title>"
                og_title = f'<meta property="og:title" content="{CATEGORIES[category]} | Zulip integrations" />'
            else:
                title = f"<title>{CATEGORIES[category]} tools | Zulip integrations</title>"
                og_title = f'<meta property="og:title" content="{CATEGORIES[category]} tools | Zulip integrations" />'
            self._test(url, [title, og_title, og_description])

        # Test integrations index page
        url = "/integrations/"
        og_title = '<meta property="og:title" content="Zulip integrations" />'
        self._test(url, [og_title, og_description])

    def test_integration_404s(self) -> None:
        # We don't need to test all the pages for 404
        for integration in list(INTEGRATIONS.keys())[5]:
            with self.settings(ROOT_DOMAIN_LANDING_PAGE=True):
                url = f"/en/integrations/doc-html/{integration}"
                result = self.client_get(url, subdomain="", follow=True)
                self.assertEqual(result.status_code, 404)
                result = self.client_get(url, subdomain="zephyr", follow=True)
                self.assertEqual(result.status_code, 404)

            url = f"/en/integrations/doc-html/{integration}"
            result = self.client_get(url, subdomain="", follow=True)
            self.assertEqual(result.status_code, 404)
            result = self.client_get(url, subdomain="zephyr", follow=True)
            self.assertEqual(result.status_code, 404)

        result = self.client_get("/integrations/doc-html/nonexistent_integration", follow=True)
        self.assertEqual(result.status_code, 404)

    def test_electron_detection(self) -> None:
        result = self.client_get("/accounts/password/reset/")
        # TODO: Ideally, this Mozilla would be the specific browser.
        self.assertTrue('data-platform="Mozilla"' in result.content.decode())

        result = self.client_get("/accounts/password/reset/", HTTP_USER_AGENT="ZulipElectron/1.0.0")
        self.assertTrue('data-platform="ZulipElectron"' in result.content.decode())


class HelpTest(ZulipTestCase):
    def test_help_settings_links(self) -> None:
        result = self.client_get("/help/change-the-time-format")
        self.assertEqual(result.status_code, 200)
        self.assertIn('Go to <a href="/#settings/preferences">Preferences</a>', str(result.content))
        # Check that the sidebar was rendered properly.
        self.assertIn("Getting started with Zulip", str(result.content))

        with self.settings(ROOT_DOMAIN_LANDING_PAGE=True):
            result = self.client_get("/help/change-the-time-format", subdomain="")
        self.assertEqual(result.status_code, 200)
        self.assertIn("<strong>Preferences</strong>", str(result.content))
        self.assertNotIn("/#settings", str(result.content))

    def test_help_relative_links_for_gear(self) -> None:
        result = self.client_get("/help/analytics")
        self.assertIn(
            '<a href="/stats"><i class="fa fa-bar-chart"></i> Usage statistics</a>',
            str(result.content),
        )
        self.assertEqual(result.status_code, 200)

        with self.settings(ROOT_DOMAIN_LANDING_PAGE=True):
            result = self.client_get("/help/analytics", subdomain="")
        self.assertEqual(result.status_code, 200)
        self.assertIn(
            '<strong><i class="fa fa-bar-chart"></i> Usage statistics</strong>', str(result.content)
        )
        self.assertNotIn("/stats", str(result.content))

    def test_help_relative_links_for_stream(self) -> None:
        result = self.client_get("/help/message-a-stream-by-email")
        self.assertIn('<a href="/#streams/subscribed">Subscribed streams</a>', str(result.content))
        self.assertEqual(result.status_code, 200)

        with self.settings(ROOT_DOMAIN_LANDING_PAGE=True):
            result = self.client_get("/help/message-a-stream-by-email", subdomain="")
        self.assertEqual(result.status_code, 200)
        self.assertIn("<strong>Manage streams</strong>", str(result.content))
        self.assertNotIn("/#streams", str(result.content))


class IntegrationTest(ZulipTestCase):
    def test_check_if_every_integration_has_logo_that_exists(self) -> None:
        for integration in INTEGRATIONS.values():
            assert integration.logo_url is not None
            path = urlsplit(integration.logo_url).path
            self.assertTrue(os.path.isfile(settings.DEPLOY_ROOT + path), integration.name)

    def test_api_url_view_subdomains_base(self) -> None:
        context: Dict[str, Any] = {}
        add_api_url_context(context, HostRequestMock())
        self.assertEqual(context["api_url_scheme_relative"], "testserver/api")
        self.assertEqual(context["api_url"], "http://testserver/api")
        self.assertTrue(context["html_settings_links"])

    @override_settings(ROOT_DOMAIN_LANDING_PAGE=True)
    def test_api_url_view_subdomains_homepage_base(self) -> None:
        context: Dict[str, Any] = {}
        add_api_url_context(context, HostRequestMock())
        self.assertEqual(context["api_url_scheme_relative"], "yourZulipDomain.testserver/api")
        self.assertEqual(context["api_url"], "http://yourZulipDomain.testserver/api")
        self.assertFalse(context["html_settings_links"])

    def test_api_url_view_subdomains_full(self) -> None:
        context: Dict[str, Any] = {}
        request = HostRequestMock(host="mysubdomain.testserver")
        add_api_url_context(context, request)
        self.assertEqual(context["api_url_scheme_relative"], "mysubdomain.testserver/api")
        self.assertEqual(context["api_url"], "http://mysubdomain.testserver/api")
        self.assertTrue(context["html_settings_links"])


class AboutPageTest(ZulipTestCase):
    @skipUnless(settings.ZILENCER_ENABLED, "requires zilencer")
    def test_endpoint(self) -> None:
        with self.settings(CONTRIBUTOR_DATA_FILE_PATH="zerver/tests/fixtures/authors.json"):
            result = self.client_get("/team/")
        self.assert_in_success_response(["Our amazing community"], result)
        self.assert_in_success_response(["2017-11-20"], result)
        self.assert_in_success_response(["timabbott", "showell", "gnprice", "rishig"], result)

        with mock.patch("corporate.views.portico.open", side_effect=FileNotFoundError) as m:
            result = self.client_get("/team/")
            self.assertEqual(result.status_code, 200)
            self.assert_in_success_response(["Never ran"], result)
            m.assert_called_once()

        with self.settings(ZILENCER_ENABLED=False):
            result = self.client_get("/team/")
            self.assertEqual(result.status_code, 301)
            self.assertEqual(result["Location"], "https://zulip.com/team/")


class SmtpConfigErrorTest(ZulipTestCase):
    def test_smtp_error(self) -> None:
        with self.assertLogs("django.request", level="ERROR") as m:
            result = self.client_get("/config-error/smtp")
            self.assertEqual(result.status_code, 500)
            self.assert_in_response("email configuration", result)
            self.assertEqual(
                m.output,
                ["ERROR:django.request:Internal Server Error: /config-error/smtp"],
            )


class PlansPageTest(ZulipTestCase):
    def test_plans_auth(self) -> None:
        root_domain = ""
        result = self.client_get("/plans/", subdomain=root_domain)
        self.assert_in_success_response(["Self-host Zulip"], result)
        self.assert_not_in_success_response(["/upgrade/#sponsorship"], result)
        self.assert_in_success_response(["/accounts/go/?next=%2Fupgrade%2F%23sponsorship"], result)

        non_existent_domain = "moo"
        result = self.client_get("/plans/", subdomain=non_existent_domain)
        self.assertEqual(result.status_code, 404)
        self.assert_in_response("does not exist", result)

        realm = get_realm("zulip")
        realm.plan_type = Realm.PLAN_TYPE_STANDARD_FREE
        realm.save(update_fields=["plan_type"])
        result = self.client_get("/plans/", subdomain="zulip")
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result["Location"], "/accounts/login/?next=/plans/")

        guest_user = "polonius"
        self.login(guest_user)
        result = self.client_get("/plans/", subdomain="zulip", follow=True)
        self.assertEqual(result.status_code, 404)

        organization_member = "hamlet"
        self.login(organization_member)
        result = self.client_get("/plans/", subdomain="zulip")
        self.assert_in_success_response(["Current plan"], result)
        self.assert_in_success_response(["/upgrade/#sponsorship"], result)
        self.assert_not_in_success_response(
            ["/accounts/go/?next=%2Fupgrade%2F%23sponsorship"], result
        )

        # Test root domain, with login on different domain
        result = self.client_get("/plans/", subdomain="")
        # TODO: works in manual testing, but I suspect something is funny in
        # the test environment
        # self.assert_in_success_response(["Sign up now"], result)

    def test_CTA_text_by_plan_type(self) -> None:
        sign_up_now = "Create organization"
        upgrade_to_standard = "Upgrade to Standard"
        current_plan = "Current plan"
        sponsorship_pending = "Sponsorship pending"

        # Root domain
        result = self.client_get("/plans/", subdomain="")
        self.assert_in_success_response([sign_up_now, upgrade_to_standard], result)
        self.assert_not_in_success_response([current_plan, sponsorship_pending], result)

        realm = get_realm("zulip")
        realm.plan_type = Realm.PLAN_TYPE_SELF_HOSTED
        realm.save(update_fields=["plan_type"])

        with self.settings(PRODUCTION=True):
            result = self.client_get("/plans/", subdomain="zulip")
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result["Location"], "https://zulip.com/plans/")

            self.login("iago")

            # SELF_HOSTED should hide the local plans page, even if logged in
            result = self.client_get("/plans/", subdomain="zulip")
            self.assertEqual(result.status_code, 302)
            self.assertEqual(result["Location"], "https://zulip.com/plans/")

        # But in the development environment, it renders a page
        result = self.client_get("/plans/", subdomain="zulip")
        self.assert_in_success_response([sign_up_now, upgrade_to_standard], result)
        self.assert_not_in_success_response([current_plan, sponsorship_pending], result)

        realm.plan_type = Realm.PLAN_TYPE_LIMITED
        realm.save(update_fields=["plan_type"])
        result = self.client_get("/plans/", subdomain="zulip")
        self.assert_in_success_response([current_plan, upgrade_to_standard], result)
        self.assert_not_in_success_response([sign_up_now, sponsorship_pending], result)

        with self.settings(FREE_TRIAL_DAYS=60):
            result = self.client_get("/plans/", subdomain="zulip")
            self.assert_in_success_response([current_plan, "Start 60 day free trial"], result)
            self.assert_not_in_success_response(
                [sign_up_now, sponsorship_pending, upgrade_to_standard], result
            )

        realm.plan_type = Realm.PLAN_TYPE_STANDARD_FREE
        realm.save(update_fields=["plan_type"])
        result = self.client_get("/plans/", subdomain="zulip")
        self.assert_in_success_response([current_plan], result)
        self.assert_not_in_success_response(
            [sign_up_now, upgrade_to_standard, sponsorship_pending], result
        )

        realm.plan_type = Realm.PLAN_TYPE_STANDARD
        realm.save(update_fields=["plan_type"])
        result = self.client_get("/plans/", subdomain="zulip")
        self.assert_in_success_response([current_plan], result)
        self.assert_not_in_success_response(
            [sign_up_now, upgrade_to_standard, sponsorship_pending], result
        )

        customer = Customer.objects.create(realm=get_realm("zulip"), stripe_customer_id="cus_id")
        plan = CustomerPlan.objects.create(
            customer=customer,
            tier=CustomerPlan.STANDARD,
            status=CustomerPlan.FREE_TRIAL,
            billing_cycle_anchor=timezone_now(),
            billing_schedule=CustomerPlan.MONTHLY,
        )
        result = self.client_get("/plans/", subdomain="zulip")
        self.assert_in_success_response(["Current plan (free trial)"], result)
        self.assert_not_in_success_response(
            [sign_up_now, upgrade_to_standard, sponsorship_pending], result
        )

        realm.plan_type = Realm.PLAN_TYPE_LIMITED
        realm.save()
        customer.sponsorship_pending = True
        customer.save()
        plan.delete()
        result = self.client_get("/plans/", subdomain="zulip")
        self.assert_in_success_response([current_plan], result)
        self.assert_in_success_response([current_plan, sponsorship_pending], result)
        self.assert_not_in_success_response([sign_up_now, upgrade_to_standard], result)


class AppsPageTest(ZulipTestCase):
    def test_get_apps_page_url(self) -> None:
        with self.settings(CORPORATE_ENABLED=False):
            apps_page_url = get_apps_page_url()
        self.assertEqual(apps_page_url, "https://zulip.com/apps/")

        with self.settings(CORPORATE_ENABLED=True):
            apps_page_url = get_apps_page_url()
        self.assertEqual(apps_page_url, "/apps/")

    def test_apps_view(self) -> None:
        with self.settings(CORPORATE_ENABLED=False):
            # Note that because this cannot actually uninstall the
            # "corporate" app and trigger updates to URL resolution,
            # this does not test the "apps/" path installed in
            # zproject.urls, but rather the special-case for testing
            # in corporate.views.portico
            result = self.client_get("/apps")
            self.assertEqual(result.status_code, 301)
            self.assertTrue(result["Location"].endswith("/apps/"))

            result = self.client_get("/apps/")
            self.assertEqual(result.status_code, 301)
            self.assertTrue(result["Location"] == "https://zulip.com/apps/")

            result = self.client_get("/apps/linux")
            self.assertEqual(result.status_code, 301)
            self.assertTrue(result["Location"] == "https://zulip.com/apps/")

        with self.settings(CORPORATE_ENABLED=True):
            result = self.client_get("/apps")
            self.assertEqual(result.status_code, 301)
            self.assertTrue(result["Location"].endswith("/apps/"))

            result = self.client_get("/apps/")
            self.assertEqual(result.status_code, 200)
            html = result.content.decode()
            self.assertIn("Apps for every platform.", html)

    def test_app_download_link_view(self) -> None:
        return_value = "https://desktop-download.zulip.com/v5.4.3/Zulip-Web-Setup-5.4.3.exe"
        with mock.patch(
            "corporate.views.portico.get_latest_github_release_download_link_for_platform",
            return_value=return_value,
        ) as m:
            result = self.client_get("/apps/download/windows")
            m.assert_called_once_with("windows")
            self.assertEqual(result.status_code, 302)
            self.assertTrue(result["Location"] == return_value)

        result = self.client_get("/apps/download/plan9")
        self.assertEqual(result.status_code, 404)


class PrivacyTermsTest(ZulipTestCase):
    def test_terms_and_policies_index(self) -> None:
        with self.settings(POLICIES_DIRECTORY="corporate/policies"):
            response = self.client_get("/policies/")
        self.assert_in_success_response(["Terms and policies"], response)

    def test_custom_terms_of_service_template(self) -> None:
        not_configured_message = "This server is an installation"
        with self.settings(POLICIES_DIRECTORY="zerver/policies_absent"):
            response = self.client_get("/policies/terms")
        self.assert_in_response(not_configured_message, response)

        with self.settings(POLICIES_DIRECTORY="corporate/policies"):
            response = self.client_get("/policies/terms")
        self.assert_in_success_response(["Kandra Labs"], response)

    def test_custom_privacy_policy_template(self) -> None:
        not_configured_message = "This server is an installation"
        with self.settings(POLICIES_DIRECTORY="zerver/policies_absent"):
            response = self.client_get("/policies/privacy")
        self.assert_in_response(not_configured_message, response)

        with self.settings(POLICIES_DIRECTORY="corporate/policies"):
            response = self.client_get("/policies/privacy")
        self.assert_in_success_response(["Kandra Labs"], response)

    def test_custom_privacy_policy_template_with_absolute_url(self) -> None:
        """Verify that using our recommended production default of an absolute path
        like /etc/zulip/policies/ works."""
        current_dir = os.path.dirname(os.path.abspath(__file__))
        abs_path = os.path.abspath(
            os.path.join(current_dir, "..", "..", "templates/corporate/policies")
        )
        with self.settings(POLICIES_DIRECTORY=abs_path):
            response = self.client_get("/policies/privacy")
        self.assert_in_success_response(["Kandra Labs"], response)

        with self.settings(POLICIES_DIRECTORY=abs_path):
            response = self.client_get("/policies/nonexistent")
        self.assert_in_response("No such page", response)

    def test_redirects_from_older_urls(self) -> None:
        with self.settings(POLICIES_DIRECTORY="corporate/policies"):
            result = self.client_get("/privacy/", follow=True)
        self.assert_in_success_response(["Kandra Labs"], result)

        with self.settings(POLICIES_DIRECTORY="corporate/policies"):
            result = self.client_get("/terms/", follow=True)
        self.assert_in_success_response(["Kandra Labs"], result)

    def test_no_nav(self) -> None:
        # Test that our ?nav=0 feature of /policies/privacy and /policies/terms,
        # designed to comply with the Apple App Store draconian
        # policies that ToS/Privacy pages linked from an iOS app have
        # no links to the rest of the site if there's pricing
        # information for anything elsewhere on the site.

        # We don't have this link at all on these pages; this first
        # line of the test would change if we were to adjust the
        # design.
        response = self.client_get("/policies/terms")
        self.assert_not_in_success_response(["Back to Zulip"], response)

        response = self.client_get("/policies/terms", {"nav": "no"})
        self.assert_not_in_success_response(["Back to Zulip"], response)

        response = self.client_get("/policies/privacy", {"nav": "no"})
        self.assert_not_in_success_response(["Back to Zulip"], response)