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fix cyrillic URL previews by hardcoding all page decoding to UTF-8 for now, rather than relying on lxml's heuristics which seem to get it wrong

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This commit is contained in:
Matthew Hodgson 2016-04-15 13:19:57 +01:00
parent 737aee9295
commit 84f9cac4d0
1 changed files with 8 additions and 16 deletions
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24
synapse/rest/media/v1/preview_url_resource.py
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@ -181,22 +181,14 @@ class PreviewUrlResource(BaseMediaResource):
from lxml import html from lxml import html
try: # XXX: always manually try to decode body as utf-8 first, which
tree = html.parse(media_info['filename']) # seems to help with most character encoding woes.
og = yield self._calc_og(tree, media_info, requester) # XXX: handle non-utf-8 encodings?
except UnicodeDecodeError: file = open(media_info['filename'])
# XXX: evil evil bodge body = file.read()
# Empirically, sites like google.com mix Latin-1 and utf-8 file.close()
# encodings in the same page. The rogue Latin-1 characters tree = html.fromstring(body.decode('utf-8', 'ignore'))
# cause lxml to choke with a UnicodeDecodeError, so if we og = yield self._calc_og(tree, media_info, requester)
# see this we go and do a manual decode of the HTML before
# handing it to lxml as utf-8 encoding, counter-intuitively,
# which seems to make it happier...
file = open(media_info['filename'])
body = file.read()
file.close()
tree = html.fromstring(body.decode('utf-8', 'ignore'))
og = yield self._calc_og(tree, media_info, requester)
else: else:
logger.warn("Failed to find any OG data in %s", url) logger.warn("Failed to find any OG data in %s", url)