def _country_tld_from_url(url: str) -> Optional[str]:
"""
Extract country TLD from URL; it's URL looks weird, don't sweat about it.
:param url: URL, e.g. "https://www.bbc.co.uk/news/politics/eu-regions/vote2014_sitemap.xml".
:return: Country TLD of URL without the prefix period, e.g. "uk", or None if there's no TLD.
"""
if not url:
return None
url = fix_common_url_mistakes(url)
try:
url = canonical_url(url)
except Exception as ex:
log.error(f"Unable to get canonical URL from URL {url}: {ex}")
return None
try:
parsed_url = urlparse(url)
except Exception as ex:
log.warning(f"Unable to parse URL {url}: {ex}")
return None
hostname_parts = parsed_url.hostname.split('.')
if len(hostname_parts) < 2:
log.warning(f"No TLD found in URL {url}")
return None
return hostname_parts[-1].lower()
def test_canonical_url():
# Bad input
with pytest.raises(mc_url.McCanonicalURLException):
# noinspection PyTypeChecker
mc_url.canonical_url(None)
with pytest.raises(mc_url.McCanonicalURLException):
# noinspection PyTypeChecker
mc_url.canonical_url('')
# Invalid URL
with pytest.raises(mc_url.McCanonicalURLException):
funky_url = ('http://Las%20Vegas%20mass%20shooting%20raises%20new%20'
'doubts%20about%20safety%20of%20live%20entertainment')
mc_url.canonical_url(funky_url)
# No urls_are_equal() because we want to compare them as strings here
assert mc_url.canonical_url('HTTP://CYBER.LAW.HARVARD.EDU:80/node/9244') == 'http://cyber.law.harvard.edu/node/9244'
def test_canonical_url():
# Bad input
with pytest.raises(mc_url.McCanonicalURLException):
# noinspection PyTypeChecker
mc_url.canonical_url(None)
with pytest.raises(mc_url.McCanonicalURLException):
# noinspection PyTypeChecker
mc_url.canonical_url('')
# Invalid URL
with pytest.raises(mc_url.McCanonicalURLException):
funky_url = ('http://Las%20Vegas%20mass%20shooting%20raises%20new%20'
'doubts%20about%20safety%20of%20live%20entertainment')
mc_url.canonical_url(funky_url)
# No urls_are_equal() because we want to compare them as strings here
assert mc_url.canonical_url('HTTP://CYBER.LAW.HARVARD.EDU:80/node/9244') == 'http://cyber.law.harvard.edu/node/9244'
def _get_url_stats(url: str, config: Optional[FacebookConfig] = None) -> FacebookURLStats:
"""
Get Facebook statistics for an URL.
Return URL stats on success, throw an exception on failure.
:param url: URL to fetch the stats for.
:param config: (optional) Facebook configuration object.
:return FacebookURLStats object, or None if stats for this URL couldn't be fetched.
"""
url = decode_object_from_bytes_if_needed(url)
if not url:
# Treat unset URLs as a soft failure
raise McFacebookInvalidURLException(url=url, error_message="URL is not set.")
url = fix_common_url_mistakes(url)
if not is_http_url(url):
log.error(f": {url}")
raise McFacebookInvalidURLException(url=url, error_message="URL is not HTTP(s).")
try:
url = canonical_url(url)
except Exception as ex:
raise McFacebookInvalidURLException(url=url, error_message=f"Unable to canonicalize URL: {ex}")
for pattern in __URL_PATTERNS_WHICH_WONT_WORK:
if re.search(pattern, url):
raise McFacebookInvalidURLException(
url=url,
error_message=f"URL matches one of the patterns for URLs that won't work against Facebook API.",
)
if not config:
config = FacebookConfig()
if not config.is_enabled():
raise McFacebookInvalidConfigurationException("Facebook API is not enabled.")
# Make API request (https://developers.facebook.com/docs/graph-api/reference/v5.0/url)
try:
data = _api_request(
node='',
params={
'id': url,
'fields': 'engagement',
},
config=config,
)
except McFacebookException as ex:
# Pass the known exception back to the caller for them to deal with
log.error(f"Unable to fetch stats for URL '{url}': {ex}")
raise ex
except Exception as ex:
# If an unknown exception was raised while making an API call, consider it a fatal error
raise McFacebookErrorAPIResponseException(
f"Unknown error happened while fetching stats for URL '{url}': {ex}"
)
if 'error' in data:
log.error(f"Facebook API responded with error while fetching stats for URL '{url}': {data}")
error = data['error']
error_type = error.get('type', 'unknown type')
error_message = error.get('message', 'unknown message')
if error_type == 'GraphMethodException' and 'Unsupported get request' in error_message:
# Non-fatal permissions error for this specific URL
raise McFacebookInvalidURLException(url=url, error_message=error_message)
elif error_type == 'OAuthException' and error_message == 'An unknown error has occurred.':
# some urls consistently return this error. true permissions errors don't return 'unknown error' message.
raise McFacebookInvalidURLException(url=url, error_message=error_message)
elif error_type == 'OAuthException' and 'facebook.com' in error_message:
# facebook urls require permissions we don't have
raise McFacebookInvalidURLException(url=url, error_message=error_message)
else:
# Everything else is considered a fatal error by us as we don't know what exactly happened
raise McFacebookErrorAPIResponseException(
f"Error response while fetching stats for URL '{url}': {error_type} {error_message}"
)
response_url = data.get('id', None)
if response_url is None:
# Facebook API is expected to always return URL that we got the stats for
raise McFacebookUnexpectedAPIResponseException(
response=data,
error_message="Response doesn't have 'id' key",
)
response_url = str(response_url)
# Facebook API returns a numeric ID for a URL that's a Facebook page
if not response_url.isdigit():
# Verify that we got stats for the right URL
# FIXME for whatever reason 'url' does get un-canonicalized at this point
if response_url != url and canonical_url(response_url) != canonical_url(url):
raise McFacebookUnexpectedAPIResponseException(
response=data,
error_message=f"Response URL ({response_url}) is not the same as request URL ({url})",
)
engagement = data.get('engagement', None)
if engagement is None:
# We expect 'engagement' to be at least set to an empty dict
raise McFacebookUnexpectedAPIResponseException(
response=data,
error_message="Response doesn't have 'engagement' key",
)
# While 'engagement' is expected to always be set, all URL stats are not required to be present because Facebook
# might not have ever seen this URL before
stats = FacebookURLStats(
share_count=engagement.get('share_count', None),
comment_count=engagement.get('comment_count', None),
reaction_count=engagement.get('reaction_count', None),
)
# If none of the stats are set, just return None
if stats.share_count is None and stats.comment_count is None and stats.reaction_count is None:
raise McFacebookInvalidURLException(url=url, error_message="No statistics were returned for URL.")
log.debug(f"Facebook statistics for URL '{url}': {stats}")
return stats
