diff options
Diffstat (limited to '')
| -rw-r--r-- | synapse/rest/media/v1/preview_url_resource.py | 174 |
1 files changed, 96 insertions, 78 deletions
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py index bae3905a43..a7ffe593b1 100644 --- a/synapse/rest/media/v1/preview_url_resource.py +++ b/synapse/rest/media/v1/preview_url_resource.py @@ -74,84 +74,93 @@ class PreviewUrlResource(BaseMediaResource): elif self._is_html(media_info['media_type']): # TODO: somehow stop a big HTML tree from exploding synapse's RAM - # XXX: can't work out how to make lxml ignore UTF8 decoding errors - # so slurp as a string at this point. - file = open(media_info['filename']) - body = file.read() - file.close() - # FIXME: we shouldn't be forcing utf-8 if the page isn't actually utf-8... - tree = html.fromstring(body.decode('utf-8','ignore')) - # tree = html.parse(media_info['filename']) - - # 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 &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'] - - if not 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 - - 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: - base = list(urlparse(media_info['uri'])) - src = list(urlparse(images[0].attrib['src'])) - if not src[0] and not src[1]: - src[0] = base[0] - src[1] = base[1] - if not src[2].startswith('/'): - src[2] = re.sub(r'/[^/]+$', '/', base[2]) + src[2] - og['og:image'] = urlunparse(src) - - 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) < 1024: - text += text_node + ' ' + 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 &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'] + + 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: - break - text = re.sub(r'[\t ]+', ' ', text) - text = re.sub(r'[\t \r\n]*[\r\n]+', '\n', text) - text = text.strip()[:1024] - 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 + 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() + 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() + else: logger.warn("Failed to find any OG data in %s", url) og = {} @@ -173,6 +182,15 @@ class PreviewUrlResource(BaseMediaResource): ) raise + 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] + url[1] = base[1] + if not url[2].startswith('/'): + url[2] = re.sub(r'/[^/]+$', '/', base[2]) + url[2] + return urlunparse(url) @defer.inlineCallbacks def _download_url(self, url, user): @@ -223,7 +241,7 @@ class PreviewUrlResource(BaseMediaResource): download_name = None yield self.store.store_local_media( - media_id=fname, + media_id=file_id, media_type=media_type, time_now_ms=self.clock.time_msec(), upload_name=download_name, |