From 00c93d2e7ef5642c9cf900f3fdcfa229e70f843d Mon Sep 17 00:00:00 2001 From: Patrick Cloke Date: Fri, 7 Oct 2022 09:29:43 -0400 Subject: [PATCH] Be more lenient in the oEmbed response parsing. (#14089) Attempt to parse any valid information from an oEmbed response (instead of bailing at the first unexpected data). This should allow for more partial oEmbed data to be returned, resulting in better / more URL previews, even if those URL previews are only partial. --- changelog.d/14089.bugfix | 1 + synapse/rest/media/v1/oembed.py | 119 +++++++++++++++-------------- tests/rest/media/v1/test_oembed.py | 103 ++++++++++++++++++++++++- 3 files changed, 166 insertions(+), 57 deletions(-) create mode 100644 changelog.d/14089.bugfix diff --git a/changelog.d/14089.bugfix b/changelog.d/14089.bugfix new file mode 100644 index 000000000..4a398921b --- /dev/null +++ b/changelog.d/14089.bugfix @@ -0,0 +1 @@ +Fix a bug where invalid oEmbed fields would cause the entire response to be discarded. Introduced in Synapse 1.18.0. diff --git a/synapse/rest/media/v1/oembed.py b/synapse/rest/media/v1/oembed.py index 2177b46c9..827afd868 100644 --- a/synapse/rest/media/v1/oembed.py +++ b/synapse/rest/media/v1/oembed.py @@ -139,66 +139,73 @@ class OEmbedProvider: try: # oEmbed responses *must* be UTF-8 according to the spec. oembed = json_decoder.decode(raw_body.decode("utf-8")) + except ValueError: + return OEmbedResult({}, None, None) - # The version is a required string field, but not always provided, - # or sometimes provided as a float. Be lenient. - oembed_version = oembed.get("version", "1.0") - if oembed_version != "1.0" and oembed_version != 1: - raise RuntimeError(f"Invalid oEmbed version: {oembed_version}") + # The version is a required string field, but not always provided, + # or sometimes provided as a float. Be lenient. + oembed_version = oembed.get("version", "1.0") + if oembed_version != "1.0" and oembed_version != 1: + return OEmbedResult({}, None, None) - # Ensure the cache age is None or an int. - cache_age = oembed.get("cache_age") - if cache_age: - cache_age = int(cache_age) * 1000 - - # The results. - open_graph_response = { - "og:url": url, - } - - title = oembed.get("title") - if title: - open_graph_response["og:title"] = title - - author_name = oembed.get("author_name") - - # Use the provider name and as the site. - provider_name = oembed.get("provider_name") - if provider_name: - open_graph_response["og:site_name"] = provider_name - - # If a thumbnail exists, use it. Note that dimensions will be calculated later. - if "thumbnail_url" in oembed: - open_graph_response["og:image"] = oembed["thumbnail_url"] - - # Process each type separately. - oembed_type = oembed["type"] - if oembed_type == "rich": - calc_description_and_urls(open_graph_response, oembed["html"]) - - elif oembed_type == "photo": - # If this is a photo, use the full image, not the thumbnail. - open_graph_response["og:image"] = oembed["url"] - - elif oembed_type == "video": - open_graph_response["og:type"] = "video.other" - calc_description_and_urls(open_graph_response, oembed["html"]) - open_graph_response["og:video:width"] = oembed["width"] - open_graph_response["og:video:height"] = oembed["height"] - - elif oembed_type == "link": - open_graph_response["og:type"] = "website" - - else: - raise RuntimeError(f"Unknown oEmbed type: {oembed_type}") - - except Exception as e: - # Trap any exception and let the code follow as usual. - logger.warning("Error parsing oEmbed metadata from %s: %r", url, e) - open_graph_response = {} - author_name = None + # Attempt to parse the cache age, if possible. + try: + cache_age = int(oembed.get("cache_age")) * 1000 + except (TypeError, ValueError): + # If the cache age cannot be parsed (e.g. wrong type or invalid + # string), ignore it. cache_age = None + # The oEmbed response converted to Open Graph. + open_graph_response: JsonDict = {"og:url": url} + + title = oembed.get("title") + if title and isinstance(title, str): + open_graph_response["og:title"] = title + + author_name = oembed.get("author_name") + if not isinstance(author_name, str): + author_name = None + + # Use the provider name and as the site. + provider_name = oembed.get("provider_name") + if provider_name and isinstance(provider_name, str): + open_graph_response["og:site_name"] = provider_name + + # If a thumbnail exists, use it. Note that dimensions will be calculated later. + thumbnail_url = oembed.get("thumbnail_url") + if thumbnail_url and isinstance(thumbnail_url, str): + open_graph_response["og:image"] = thumbnail_url + + # Process each type separately. + oembed_type = oembed.get("type") + if oembed_type == "rich": + html = oembed.get("html") + if isinstance(html, str): + calc_description_and_urls(open_graph_response, html) + + elif oembed_type == "photo": + # If this is a photo, use the full image, not the thumbnail. + url = oembed.get("url") + if url and isinstance(url, str): + open_graph_response["og:image"] = url + + elif oembed_type == "video": + open_graph_response["og:type"] = "video.other" + html = oembed.get("html") + if html and isinstance(html, str): + calc_description_and_urls(open_graph_response, oembed["html"]) + for size in ("width", "height"): + val = oembed.get(size) + if val is not None and isinstance(val, int): + open_graph_response[f"og:video:{size}"] = val + + elif oembed_type == "link": + open_graph_response["og:type"] = "website" + + else: + logger.warning("Unknown oEmbed type: %s", oembed_type) + return OEmbedResult(open_graph_response, author_name, cache_age) diff --git a/tests/rest/media/v1/test_oembed.py b/tests/rest/media/v1/test_oembed.py index f38d7225f..319ae8b1c 100644 --- a/tests/rest/media/v1/test_oembed.py +++ b/tests/rest/media/v1/test_oembed.py @@ -14,6 +14,8 @@ import json +from parameterized import parameterized + from twisted.test.proto_helpers import MemoryReactor from synapse.rest.media.v1.oembed import OEmbedProvider, OEmbedResult @@ -23,8 +25,16 @@ from synapse.util import Clock from tests.unittest import HomeserverTestCase +try: + import lxml +except ImportError: + lxml = None + class OEmbedTests(HomeserverTestCase): + if not lxml: + skip = "url preview feature requires lxml" + def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None: self.oembed = OEmbedProvider(hs) @@ -36,7 +46,7 @@ class OEmbedTests(HomeserverTestCase): def test_version(self) -> None: """Accept versions that are similar to 1.0 as a string or int (or missing).""" for version in ("1.0", 1.0, 1): - result = self.parse_response({"version": version, "type": "link"}) + result = self.parse_response({"version": version}) # An empty Open Graph response is an error, ensure the URL is included. self.assertIn("og:url", result.open_graph_result) @@ -49,3 +59,94 @@ class OEmbedTests(HomeserverTestCase): result = self.parse_response({"version": version, "type": "link"}) # An empty Open Graph response is an error, ensure the URL is included. self.assertEqual({}, result.open_graph_result) + + def test_cache_age(self) -> None: + """Ensure a cache-age is parsed properly.""" + # Correct-ish cache ages are allowed. + for cache_age in ("1", 1.0, 1): + result = self.parse_response({"cache_age": cache_age}) + self.assertEqual(result.cache_age, 1000) + + # Invalid cache ages are ignored. + for cache_age in ("invalid", {}): + result = self.parse_response({"cache_age": cache_age}) + self.assertIsNone(result.cache_age) + + # Cache age is optional. + result = self.parse_response({}) + self.assertIsNone(result.cache_age) + + @parameterized.expand( + [ + ("title", "title"), + ("provider_name", "site_name"), + ("thumbnail_url", "image"), + ], + name_func=lambda func, num, p: f"{func.__name__}_{p.args[0]}", + ) + def test_property(self, oembed_property: str, open_graph_property: str) -> None: + """Test properties which must be strings.""" + result = self.parse_response({oembed_property: "test"}) + self.assertIn(f"og:{open_graph_property}", result.open_graph_result) + self.assertEqual(result.open_graph_result[f"og:{open_graph_property}"], "test") + + result = self.parse_response({oembed_property: 1}) + self.assertNotIn(f"og:{open_graph_property}", result.open_graph_result) + + def test_author_name(self) -> None: + """Test the author_name property.""" + result = self.parse_response({"author_name": "test"}) + self.assertEqual(result.author_name, "test") + + result = self.parse_response({"author_name": 1}) + self.assertIsNone(result.author_name) + + def test_rich(self) -> None: + """Test a type of rich.""" + result = self.parse_response({"html": "test", "type": "rich"}) + self.assertIn("og:description", result.open_graph_result) + self.assertIn("og:image", result.open_graph_result) + self.assertEqual(result.open_graph_result["og:description"], "test") + self.assertEqual(result.open_graph_result["og:image"], "foo") + + result = self.parse_response({"type": "rich"}) + self.assertNotIn("og:description", result.open_graph_result) + + result = self.parse_response({"html": 1, "type": "rich"}) + self.assertNotIn("og:description", result.open_graph_result) + + def test_photo(self) -> None: + """Test a type of photo.""" + result = self.parse_response({"url": "test", "type": "photo"}) + self.assertIn("og:image", result.open_graph_result) + self.assertEqual(result.open_graph_result["og:image"], "test") + + result = self.parse_response({"type": "photo"}) + self.assertNotIn("og:image", result.open_graph_result) + + result = self.parse_response({"url": 1, "type": "photo"}) + self.assertNotIn("og:image", result.open_graph_result) + + def test_video(self) -> None: + """Test a type of video.""" + result = self.parse_response({"html": "test", "type": "video"}) + self.assertIn("og:type", result.open_graph_result) + self.assertEqual(result.open_graph_result["og:type"], "video.other") + self.assertIn("og:description", result.open_graph_result) + self.assertEqual(result.open_graph_result["og:description"], "test") + + result = self.parse_response({"type": "video"}) + self.assertIn("og:type", result.open_graph_result) + self.assertEqual(result.open_graph_result["og:type"], "video.other") + self.assertNotIn("og:description", result.open_graph_result) + + result = self.parse_response({"url": 1, "type": "video"}) + self.assertIn("og:type", result.open_graph_result) + self.assertEqual(result.open_graph_result["og:type"], "video.other") + self.assertNotIn("og:description", result.open_graph_result) + + def test_link(self) -> None: + """Test type of link.""" + result = self.parse_response({"type": "link"}) + self.assertIn("og:type", result.open_graph_result) + self.assertEqual(result.open_graph_result["og:type"], "website")