zulip/zerver/tests/test_thumbnail.py

from io import StringIO

import orjson
from django.test import override_settings

from zerver.lib.rate_limiter import add_ratelimit_rule, remove_ratelimit_rule
from zerver.lib.test_classes import ZulipTestCase


class ThumbnailTest(ZulipTestCase):
    def test_thumbnail_redirect(self) -> None:
        self.login("hamlet")
        fp = StringIO("zulip!")
        fp.name = "zulip.jpeg"

        result = self.client_post("/json/user_uploads", {"file": fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        self.assertIn("uri", json)
        uri = json["uri"]
        base = "/user_uploads/"
        self.assertEqual(base, uri[: len(base)])

        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        self.assertEqual(uri, result.url)

        self.login("iago")
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 403, result)
        self.assert_in_response("You are not authorized to view this file.", result)

        uri = "https://www.google.com/images/srpr/logo4w.png"
        result = self.client_get("/thumbnail", {"url": uri, "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        base = "https://external-content.zulipcdn.net/external_content/56c362a24201593891955ff526b3b412c0f9fcd2/68747470733a2f2f7777772e676f6f676c652e636f6d2f696d616765732f737270722f6c6f676f34772e706e67"
        self.assertEqual(base, result.url)

        uri = "http://www.google.com/images/srpr/logo4w.png"
        result = self.client_get("/thumbnail", {"url": uri, "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        base = "https://external-content.zulipcdn.net/external_content/7b6552b60c635e41e8f6daeb36d88afc4eabde79/687474703a2f2f7777772e676f6f676c652e636f6d2f696d616765732f737270722f6c6f676f34772e706e67"
        self.assertEqual(base, result.url)

        uri = "//www.google.com/images/srpr/logo4w.png"
        result = self.client_get("/thumbnail", {"url": uri, "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        base = "https://external-content.zulipcdn.net/external_content/676530cf4b101d56f56cc4a37c6ef4d4fd9b0c03/2f2f7777772e676f6f676c652e636f6d2f696d616765732f737270722f6c6f676f34772e706e67"
        self.assertEqual(base, result.url)

    @override_settings(RATE_LIMITING=True)
    def test_thumbnail_redirect_for_spectator(self) -> None:
        self.login("hamlet")
        fp = StringIO("zulip!")
        fp.name = "zulip.jpeg"

        result = self.client_post("/json/user_uploads", {"file": fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        uri = json["uri"]

        add_ratelimit_rule(86400, 1000, domain="spectator_attachment_access_by_file")
        # Deny file access for non-web-public stream
        self.subscribe(self.example_user("hamlet"), "Denmark")
        host = self.example_user("hamlet").realm.host
        body = f"First message ...[zulip.txt](http://{host}" + uri + ")"
        self.send_stream_message(self.example_user("hamlet"), "Denmark", body, "test")

        self.logout()
        response = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(response.status_code, 403)

        # Allow file access for web-public stream
        self.login("hamlet")
        self.make_stream("web-public-stream", is_web_public=True)
        self.subscribe(self.example_user("hamlet"), "web-public-stream")
        body = f"First message ...[zulip.txt](http://{host}" + uri + ")"
        self.send_stream_message(self.example_user("hamlet"), "web-public-stream", body, "test")

        self.logout()
        response = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(response.status_code, 302)
        remove_ratelimit_rule(86400, 1000, domain="spectator_attachment_access_by_file")

        # Deny file access since rate limited
        add_ratelimit_rule(86400, 0, domain="spectator_attachment_access_by_file")
        response = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(response.status_code, 403)
        remove_ratelimit_rule(86400, 0, domain="spectator_attachment_access_by_file")

        # Deny random file access
        response = self.client_get(
            "/thumbnail",
            {
                "url": "user_uploads/2/71/QYB7LA-ULMYEad-QfLMxmI2e/zulip-non-existent.txt",
                "size": "full",
            },
        )
        self.assertEqual(response.status_code, 403)