diff options
Diffstat (limited to 'synapse/rest/media')
| -rw-r--r-- | synapse/rest/media/v1/preview_url_resource.py | 27 | ||||
| -rw-r--r-- | synapse/rest/media/v1/thumbnailer.py | 5 |
2 files changed, 27 insertions, 5 deletions
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py index 531d923f76..fb0d02aa83 100644 --- a/synapse/rest/media/v1/preview_url_resource.py +++ b/synapse/rest/media/v1/preview_url_resource.py @@ -56,6 +56,9 @@ logger = logging.getLogger(__name__) _charset_match = re.compile(br"<\s*meta[^>]*charset\s*=\s*([a-z0-9-]+)", flags=re.I) _content_type_match = re.compile(r'.*; *charset="?(.*?)"?(;|$)', flags=re.I) +OG_TAG_NAME_MAXLEN = 50 +OG_TAG_VALUE_MAXLEN = 1000 + class PreviewUrlResource(DirectServeResource): isLeaf = True @@ -74,8 +77,8 @@ class PreviewUrlResource(DirectServeResource): treq_args={"browser_like_redirects": True}, ip_whitelist=hs.config.url_preview_ip_range_whitelist, ip_blacklist=hs.config.url_preview_ip_range_blacklist, - http_proxy=os.getenv("http_proxy"), - https_proxy=os.getenv("HTTPS_PROXY"), + http_proxy=os.getenvb(b"http_proxy"), + https_proxy=os.getenvb(b"HTTPS_PROXY"), ) self.media_repo = media_repo self.primary_base_path = media_repo.primary_base_path @@ -119,7 +122,7 @@ class PreviewUrlResource(DirectServeResource): pattern = entry[attrib] value = getattr(url_tuple, attrib) logger.debug( - "Matching attrib '%s' with value '%s' against" " pattern '%s'", + "Matching attrib '%s' with value '%s' against pattern '%s'", attrib, value, pattern, @@ -171,7 +174,7 @@ class PreviewUrlResource(DirectServeResource): ts (int): Returns: - Deferred[str]: json-encoded og data + Deferred[bytes]: json-encoded og data """ # check the URL cache in the DB (which will also provide us with # historical previews, if we have any) @@ -272,6 +275,18 @@ class PreviewUrlResource(DirectServeResource): logger.warning("Failed to find any OG data in %s", url) og = {} + # filter out any stupidly long values + keys_to_remove = [] + for k, v in og.items(): + # values can be numeric as well as strings, hence the cast to str + if len(k) > OG_TAG_NAME_MAXLEN or len(str(v)) > OG_TAG_VALUE_MAXLEN: + logger.warning( + "Pruning overlong tag %s from OG data", k[:OG_TAG_NAME_MAXLEN] + ) + keys_to_remove.append(k) + for k in keys_to_remove: + del og[k] + logger.debug("Calculated OG for %s as %s", url, og) jsonog = json.dumps(og) @@ -506,6 +521,10 @@ def _calc_og(tree, media_uri): og = {} for tag in tree.xpath("//*/meta[starts-with(@property, 'og:')]"): if "content" in tag.attrib: + # if we've got more than 50 tags, someone is taking the piss + if len(og) >= 50: + logger.warning("Skipping OG for page with too many 'og:' tags") + return {} og[tag.attrib["property"]] = tag.attrib["content"] # TODO: grab article: meta tags too, e.g.: diff --git a/synapse/rest/media/v1/thumbnailer.py b/synapse/rest/media/v1/thumbnailer.py index 8cf415e29d..c234ea7421 100644 --- a/synapse/rest/media/v1/thumbnailer.py +++ b/synapse/rest/media/v1/thumbnailer.py @@ -129,5 +129,8 @@ class Thumbnailer(object): def _encode_image(self, output_image, output_type): output_bytes_io = BytesIO() - output_image.save(output_bytes_io, self.FORMATS[output_type], quality=80) + fmt = self.FORMATS[output_type] + if fmt == "JPEG": + output_image = output_image.convert("RGB") + output_image.save(output_bytes_io, fmt, quality=80) return output_bytes_io |