mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-23 23:09:23 -05:00
refactor calc_og; spider image URLs; fix xpath; add a (broken) expiringcache; loads of other fixes
This commit is contained in:
Matthew Hodgson
parent
c60b751694
commit
5fd07da764
@ -20,6 +20,7 @@ from twisted.internet import defer
|
||||
from lxml import html
|
||||
from urlparse import urlparse, urlunparse
|
||||
from synapse.util.stringutils import random_string
|
||||
from synapse.util.caches.expiringcache import ExpiringCache
|
||||
from synapse.http.client import SpiderHttpClient
|
||||
from synapse.http.server import request_handler, respond_with_json, respond_with_json_bytes
|
||||
|
||||
@ -36,6 +37,12 @@ class PreviewUrlResource(BaseMediaResource):
|
||||
def __init__(self, hs, filepaths):
|
||||
BaseMediaResource.__init__(self, hs, filepaths)
|
||||
self.client = SpiderHttpClient(hs)
|
||||
self.cache = ExpiringCache(
|
||||
cache_name = "url_previews",
|
||||
clock = self.clock,
|
||||
expiry_ms = 60*60*1000, # don't spider URLs more often than once an hour
|
||||
)
|
||||
self.cache.start()
|
||||
|
||||
def render_GET(self, request):
|
||||
self._async_render_GET(request)
|
||||
@ -50,6 +57,11 @@ class PreviewUrlResource(BaseMediaResource):
|
||||
requester = yield self.auth.get_user_by_req(request)
|
||||
url = request.args.get("url")[0]
|
||||
|
||||
if self.cache:
|
||||
og = self.cache.get(url)
|
||||
respond_with_json_bytes(request, 200, json.dumps(og), send_cors=True)
|
||||
return
|
||||
|
||||
# TODO: keep track of whether there's an ongoing request for this preview
|
||||
# and block and return their details if there is one.
|
||||
|
||||
@ -74,98 +86,25 @@ class PreviewUrlResource(BaseMediaResource):
|
||||
elif self._is_html(media_info['media_type']):
|
||||
# TODO: somehow stop a big HTML tree from exploding synapse's RAM
|
||||
|
||||
def _calc_og():
|
||||
# suck it up into lxml and define our OG response.
|
||||
# if we see any URLs in the OG response, then spider them
|
||||
# (although the client could choose to do this by asking for previews of those URLs to avoid DoSing the server)
|
||||
|
||||
# "og:type" : "article"
|
||||
# "og:url" : "https://twitter.com/matrixdotorg/status/684074366691356672"
|
||||
# "og:title" : "Matrix on Twitter"
|
||||
# "og:image" : "https://pbs.twimg.com/profile_images/500400952029888512/yI0qtFi7_400x400.png"
|
||||
# "og:description" : "Synapse 0.12 is out! Lots of polishing, performance & bugfixes: /sync API, /r0 prefix, fulltext search, 3PID invites https://t.co/5alhXLLEGP"
|
||||
# "og:site_name" : "Twitter"
|
||||
|
||||
# or:
|
||||
|
||||
# "og:type" : "video",
|
||||
# "og:url" : "https://www.youtube.com/watch?v=LXDBoHyjmtw",
|
||||
# "og:site_name" : "YouTube",
|
||||
# "og:video:type" : "application/x-shockwave-flash",
|
||||
# "og:description" : " ",
|
||||
# "og:title" : "RemoteJam - Matrix team hack for Disrupt Europe Hackathon",
|
||||
# "og:image" : "https://i.ytimg.com/vi/LXDBoHyjmtw/maxresdefault.jpg",
|
||||
# "og:video:url" : "http://www.youtube.com/v/LXDBoHyjmtw?version=3&autohide=1",
|
||||
# "og:video:width" : "1280"
|
||||
# "og:video:height" : "720",
|
||||
# "og:video:secure_url": "https://www.youtube.com/v/LXDBoHyjmtw?version=3&autohide=1",
|
||||
|
||||
og = {}
|
||||
for tag in tree.xpath("//*/meta[starts-with(@property, 'og:')]"):
|
||||
og[tag.attrib['property']] = tag.attrib['content']
|
||||
|
||||
if 'og:title' not in og:
|
||||
# do some basic spidering of the HTML
|
||||
title = tree.xpath("(//title)[1] | (//h1)[1] | (//h2)[1] | (//h3)[1]")
|
||||
og['og:title'] = title[0].text if title else None
|
||||
|
||||
|
||||
if 'og:image' not in og:
|
||||
meta_image = tree.xpath("//*/meta[@itemprop='image']/@content");
|
||||
if meta_image:
|
||||
og['og:image'] = self._rebase_url(meta_image[0], media_info['uri'])
|
||||
else:
|
||||
images = [ i for i in tree.xpath("//img") if 'src' in i.attrib ]
|
||||
big_images = [ i for i in images if (
|
||||
'width' in i.attrib and 'height' in i.attrib and
|
||||
i.attrib['width'] > 64 and i.attrib['height'] > 64
|
||||
)]
|
||||
big_images = big_images.sort(key=lambda i: (-1 * int(i.attrib['width']) * int(i.attrib['height'])))
|
||||
images = big_images if big_images else images
|
||||
|
||||
if images:
|
||||
og['og:image'] = self._rebase_url(images[0].attrib['src'], media_info['uri'])
|
||||
|
||||
if 'og:description' not in og:
|
||||
meta_description = tree.xpath("//*/meta[@name='description']/@content");
|
||||
if meta_description:
|
||||
og['og:description'] = meta_description[0]
|
||||
else:
|
||||
text_nodes = tree.xpath("//h1/text() | //h2/text() | //h3/text() | //p/text() | //div/text() | //span/text() | //a/text()")
|
||||
# text_nodes = tree.xpath("//h1/text() | //h2/text() | //h3/text() | //p/text() | //div/text()")
|
||||
text = ''
|
||||
for text_node in text_nodes:
|
||||
if len(text) < 500:
|
||||
text += text_node + ' '
|
||||
else:
|
||||
break
|
||||
text = re.sub(r'[\t ]+', ' ', text)
|
||||
text = re.sub(r'[\t \r\n]*[\r\n]+', '\n', text)
|
||||
text = text.strip()[:500]
|
||||
og['og:description'] = text if text else None
|
||||
|
||||
# TODO: extract a favicon?
|
||||
# TODO: turn any OG media URLs into mxc URLs to capture and thumbnail them too
|
||||
# TODO: store our OG details in a cache (and expire them when stale)
|
||||
# TODO: delete the content to stop diskfilling, as we only ever cared about its OG
|
||||
return og
|
||||
|
||||
try:
|
||||
tree = html.parse(media_info['filename'])
|
||||
og = _calc_og()
|
||||
og = yield self._calc_og(tree, media_info, requester)
|
||||
except UnicodeDecodeError:
|
||||
# XXX: evil evil bodge
|
||||
file = open(media_info['filename'])
|
||||
body = file.read()
|
||||
file.close()
|
||||
tree = html.fromstring(body.decode('utf-8','ignore'))
|
||||
og = _calc_og()
|
||||
og = yield self._calc_og(tree, media_info, requester)
|
||||
|
||||
else:
|
||||
logger.warn("Failed to find any OG data in %s", url)
|
||||
og = {}
|
||||
|
||||
logger.warn(og)
|
||||
if self.cache:
|
||||
self.cache[url] = og
|
||||
|
||||
logger.warn(og);
|
||||
|
||||
respond_with_json_bytes(request, 200, json.dumps(og), send_cors=True)
|
||||
except:
|
||||
@ -182,11 +121,112 @@ class PreviewUrlResource(BaseMediaResource):
|
||||
)
|
||||
raise
|
||||
|
||||
@defer.inlineCallbacks
|
||||
def _calc_og(self, tree, media_info, requester):
|
||||
# suck our tree into lxml and define our OG response.
|
||||
|
||||
# if we see any image URLs in the OG response, then spider them
|
||||
# (although the client could choose to do this by asking for previews of those URLs to avoid DoSing the server)
|
||||
|
||||
# "og:type" : "article"
|
||||
# "og:url" : "https://twitter.com/matrixdotorg/status/684074366691356672"
|
||||
# "og:title" : "Matrix on Twitter"
|
||||
# "og:image" : "https://pbs.twimg.com/profile_images/500400952029888512/yI0qtFi7_400x400.png"
|
||||
# "og:description" : "Synapse 0.12 is out! Lots of polishing, performance &amp; bugfixes: /sync API, /r0 prefix, fulltext search, 3PID invites https://t.co/5alhXLLEGP"
|
||||
# "og:site_name" : "Twitter"
|
||||
|
||||
# or:
|
||||
|
||||
# "og:type" : "video",
|
||||
# "og:url" : "https://www.youtube.com/watch?v=LXDBoHyjmtw",
|
||||
# "og:site_name" : "YouTube",
|
||||
# "og:video:type" : "application/x-shockwave-flash",
|
||||
# "og:description" : " ",
|
||||
# "og:title" : "RemoteJam - Matrix team hack for Disrupt Europe Hackathon",
|
||||
# "og:image" : "https://i.ytimg.com/vi/LXDBoHyjmtw/maxresdefault.jpg",
|
||||
# "og:video:url" : "http://www.youtube.com/v/LXDBoHyjmtw?version=3&autohide=1",
|
||||
# "og:video:width" : "1280"
|
||||
# "og:video:height" : "720",
|
||||
# "og:video:secure_url": "https://www.youtube.com/v/LXDBoHyjmtw?version=3&autohide=1",
|
||||
|
||||
og = {}
|
||||
for tag in tree.xpath("//*/meta[starts-with(@property, 'og:')]"):
|
||||
og[tag.attrib['property']] = tag.attrib['content']
|
||||
|
||||
# TODO: grab article: meta tags too, e.g.:
|
||||
|
||||
# <meta property="article:publisher" content="https://www.facebook.com/thethudonline" />
|
||||
# <meta property="article:author" content="https://www.facebook.com/thethudonline" />
|
||||
# <meta property="article:tag" content="baby" />
|
||||
# <meta property="article:section" content="Breaking News" />
|
||||
# <meta property="article:published_time" content="2016-03-31T19:58:24+00:00" />
|
||||
# <meta property="article:modified_time" content="2016-04-01T18:31:53+00:00" />
|
||||
|
||||
if 'og:title' not in og:
|
||||
# do some basic spidering of the HTML
|
||||
title = tree.xpath("(//title)[1] | (//h1)[1] | (//h2)[1] | (//h3)[1]")
|
||||
og['og:title'] = title[0].text.strip() if title else None
|
||||
|
||||
|
||||
if 'og:image' not in og:
|
||||
# TODO: extract a favicon failing all else
|
||||
meta_image = tree.xpath("//*/meta[@itemprop='image']/@content");
|
||||
if meta_image:
|
||||
og['og:image'] = self._rebase_url(meta_image[0], media_info['uri'])
|
||||
else:
|
||||
images = tree.xpath("//img[@src][number(@width)>10][number(@height)>10]")
|
||||
images = sorted(images, key=lambda i: (-1 * int(i.attrib['width']) * int(i.attrib['height'])))
|
||||
if not images:
|
||||
images = tree.xpath("//img[@src]")
|
||||
if images:
|
||||
og['og:image'] = self._rebase_url(images[0].attrib['src'], media_info['uri'])
|
||||
|
||||
# pre-cache the image for posterity
|
||||
if 'og:image' in og and og['og:image']:
|
||||
image_info = yield self._download_url(og['og:image'], requester.user)
|
||||
|
||||
if self._is_media(image_info['media_type']):
|
||||
# TODO: make sure we don't choke on white-on-transparent images
|
||||
dims = yield self._generate_local_thumbnails(
|
||||
image_info['filesystem_id'], image_info
|
||||
)
|
||||
og["og:image"] = "mxc://%s/%s" % (self.server_name, image_info['filesystem_id'])
|
||||
og["og:image:type"] = image_info['media_type']
|
||||
og["og:image:width"] = dims['width']
|
||||
og["og:image:height"] = dims['height']
|
||||
else:
|
||||
del og["og:image"]
|
||||
|
||||
if 'og:description' not in og:
|
||||
meta_description = tree.xpath("//*/meta[@name='description']/@content");
|
||||
if meta_description:
|
||||
og['og:description'] = meta_description[0]
|
||||
else:
|
||||
# text_nodes = tree.xpath("//h1/text() | //h2/text() | //h3/text() | //p/text() | //div/text() | //span/text() | //a/text()")
|
||||
text_nodes = tree.xpath("//text()[not(ancestor::header | ancestor::nav | ancestor::aside | " +
|
||||
"ancestor::footer | ancestor::script | ancestor::style)]" +
|
||||
"[ancestor::body]")
|
||||
text = ''
|
||||
for text_node in text_nodes:
|
||||
if len(text) < 500:
|
||||
text += text_node + ' '
|
||||
else:
|
||||
break
|
||||
text = re.sub(r'[\t ]+', ' ', text)
|
||||
text = re.sub(r'[\t \r\n]*[\r\n]+', '\n', text)
|
||||
text = text.strip()[:500]
|
||||
og['og:description'] = text if text else None
|
||||
|
||||
# TODO: persist a cache mapping { url, etag } -> { og, mxc of url (if we bother keeping it around), age }
|
||||
# TODO: delete the url downloads to stop diskfilling, as we only ever cared about its OG
|
||||
defer.returnValue(og);
|
||||
|
||||
def _rebase_url(self, url, base):
|
||||
base = list(urlparse(base))
|
||||
url = list(urlparse(url))
|
||||
if not url[0] and not url[1]:
|
||||
url[0] = base[0]
|
||||
if not url[0]:
|
||||
url[0] = base[0] or "http"
|
||||
if not url[1]:
|
||||
url[1] = base[1]
|
||||
if not url[2].startswith('/'):
|
||||
url[2] = re.sub(r'/[^/]+$', '/', base[2]) + url[2]
|
||||
|
||||
Loading…
Reference in New Issue
Block a user