Add full FB API (Graph API) support

feedify.py

@@ -11,6 +11,8 @@ import lxml.html
 import json
 import urlparse
 
+import time
+
 def toclass(query):
 	pattern = r'\[class=([^\]]+)\]'
 	repl = r'[@class and contains(concat(" ", normalize-space(@class), " "), " \1 ")]'
@@ -59,7 +61,6 @@ def formatString(string, getter, error=False):
 	elif re.search(r'^([^{}<>" ]+)(?:<"([^>]+)">)?(.*)$', string):
 		match = re.search(r'^([^{}<>" ]+)(?:<"([^>]+)">)?(.*)$', string).groups()
 		rawValue = getter(match[0])
-		print repr(rawValue)
 		if not isinstance(rawValue, basestring):
 			if match[1] is not None:
 				out = match[1].join(rawValue)
@@ -76,9 +77,69 @@ def formatString(string, getter, error=False):
 	else:
 		return out
 
+def PreWorker(url, cache):
+	if urlparse.urlparse(url).netloc == 'graph.facebook.com':
+		facebook = cache.new('facebook', True)
+		token = urlparse.parse_qs(urlparse.urlparse(url).query)['access_token'][0]
+
+		if 't'+token not in facebook:
+			# this token ain't known, look for info about it
+			eurl = "https://graph.facebook.com/debug_token?input_token={token}&access_token={app_token}".format(token=token, app_token=morss.FBAPPTOKEN)
+			data = json.loads(urllib2.urlopen(eurl).read())['data']
+
+			app_id = str(data['app_id'])
+			user_id = str(data['user_id'])
+			expires = data['expires_at']
+			short = 'issued_at' not in data
+
+			facebook.set('t'+token, user_id)
+			facebook.set('e'+token, expires)
+
+			good = True
+
+			# do some woodoo to know if we already have sth better
+
+			if 'u'+user_id not in facebook:
+				# grab a new one anyway, new user
+				facebook.set('o'+user_id, token)
+				good = True
+			else:
+				# maybe it's a better one
+				last = facebook.get('u'+user_id)
+				last_expires = facebook.get('e'+last, int)
+
+				if expires > last_expires:
+					# new is better
+					good = True
+
+			if good and short and app_id == morss.FBAPPID:
+				eurl = "https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token&client_id={app_id}&client_secret={app_secret}&fb_exchange_token={short_lived_token}".format(app_id=morss.FBAPPID, app_secret=morss.FBSECRET, short_lived_token=token)
+				values = urlparse.parse_qs(urllib2.urlopen(eurl).read().strip())
+
+				token = values['access_token'][0]
+				expires = int(time.time() + int(values['expires'][0]))
+
+				facebook.set('t'+token, user_id)
+				facebook.set('e'+token, expires)
+
+			if good:
+				facebook.set('u'+user_id, token)
+
+		# hey look for a newer token and use it
+		token = urlparse.parse_qs(urlparse.urlparse(url).query)['access_token'][0]
+		user_id = facebook.get('t'+token)
+		last = facebook.get('u'+user_id)
+		original = facebook.get('o'+user_id)
+
+		nurl = url.replace(token, last)
+		ncache = url.replace(token, original)
+		cache.set('redirect', nurl)
+		cache.set('cache', ncache)
+
 class Builder(object):
-	def __init__(self, link, data=None):
+	def __init__(self, link, data=None, cache=False):
 		self.link = link
+		self.cache = cache
 
 		if data is None:
 			data = urllib2.urlopen(link).read()
@@ -167,3 +228,18 @@ class Builder(object):
 						feedItem['updated'] = self.string(item, 'item_time')
 
 					self.feed.items.append(feedItem)
+
+
+		if urlparse.urlparse(self.link).netloc == 'graph.facebook.com':
+			if self.cache:
+				facebook = self.cache.new('facebook', True)
+				token = urlparse.parse_qs(urlparse.urlparse(self.link).query)['access_token'][0]
+				expires = facebook.get('e'+token, int)
+				lifespan = expires - time.time()
+
+				if lifespan < 5*24*3600:
+					new = self.feed.items.append()
+					new.title = "APP AUTHORISATION RENEWAL NEEDED"
+					new.link = "https://www.facebook.com/dialog/oauth?client_id={app_id}&redirect_uri=http://test.morss.it/:facebook/".format(app_id=morss.FBAPPID)
+					new.desc = "Please renew your Facebook app token for this app to keep working for this feed.<br/><a href='{}'>Go!</a>".format(new.link)
+					new.time = cache.get(expires, int)

morss.py

@@ -42,6 +42,10 @@ UA_HTML = 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.11) G
 MIMETYPE = {	'xml':	['text/xml', 'application/xml', 'application/rss+xml', 'application/rdf+xml', 'application/atom+xml'],
 				'html':	['text/html', 'application/xhtml+xml']}
 
+FBAPPID = "<insert yours>"
+FBSECRET = "<insert yours>"
+FBAPPTOKEN = FBAPPID + '|' + FBSECRET
+
 PROTOCOL = ['http', 'https', 'ftp']
 
 if 'REQUEST_URI' in os.environ:
@@ -360,8 +364,13 @@ def Fill(item, cache, feedurl='/', fast=False):
 		else:
 			link = None
 
-	# facebook, do nothing for now FIXME
+	# facebook
 	if urlparse.urlparse(feedurl).netloc == 'graph.facebook.com':
+		match = lxml.html.fromstring(item.content).xpath('//a/@href')
+		if len(match) and urlparse.urlparse(match[0]).netloc != 'www.facebook.com':
+			link = match[0]
+			log(link)
+		else:
 			link = None
 
 	if link is None:
@@ -423,6 +432,9 @@ def Gather(url, cachePath, options):
 
 	log(cache._hash)
 
+	# do some useful facebook work
+	feedify.PreWorker(url, cache)
+
 	if 'redirect' in cache:
 		url = cache.get('redirect')
 		log('url redirect')
@@ -466,7 +478,7 @@ def Gather(url, cachePath, options):
 	if style == 'normal':
 		rss = feeds.parse(xml)
 	elif style == 'feedify':
-		feed = feedify.Builder(url, xml)
+		feed = feedify.Builder(url, xml, cache)
 		feed.build()
 		rss = feed.feed
 	elif style == 'html':
@@ -526,7 +538,7 @@ if __name__ == '__main__':
 		HOLD = True
 
 		if 'HTTP_IF_NONE_MATCH' in os.environ:
-			if not options.force and time.time() - int(os.environ['HTTP_IF_NONE_MATCH'][1:-1]) < DELAY:
+			if not options.force and not options.facebook and time.time() - int(os.environ['HTTP_IF_NONE_MATCH'][1:-1]) < DELAY:
 				print 'Status: 304'
 				print
 				log(url)
@@ -538,6 +550,42 @@ if __name__ == '__main__':
 		else:
 			cachePath = os.path.expanduser('~') + '/.cache/morss'
 
+	if options.facebook:
+		facebook = Cache(cachePath, 'facebook', True)
+
+		# get real token from code
+		code = urlparse.parse_qs(urlparse.urlparse(url).query)['code'][0]
+		eurl = "https://graph.facebook.com/oauth/access_token?client_id={app_id}&redirect_uri={redirect_uri}&client_secret={app_secret}&code={code_parameter}".format(app_id=FBAPPID, app_secret=FBSECRET, code_parameter=code, redirect_uri="http://test.morss.it/:facebook/")
+		token = urlparse.parse_qs(urllib2.urlopen(eurl).read().strip())['access_token'][0]
+
+		# get long-lived access token
+		eurl = "https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token&client_id={app_id}&client_secret={app_secret}&fb_exchange_token={short_lived_token}".format(app_id=FBAPPID, app_secret=FBSECRET, short_lived_token=token)
+		values = urlparse.parse_qs(urllib2.urlopen(eurl).read().strip())
+
+		ltoken = values['access_token'][0]
+		expires = int(time.time() + int(values['expires'][0]))
+
+		# get user id
+		iurl = "https://graph.facebook.com/me?fields=id&access_token={token}".format(ltoken)
+		user_id = json.loads(urllib2.urlopen(iurl).read())['id']
+
+		# do sth out of it
+		facebook.set('t'+ltoken, user_id)
+		facebook.set('e'+ltoken, expires)
+		facebook.set('u'+user_id, ltoken)
+
+		if 'o'+user_id not in token:
+			facebook.set('o'+user_id, ltoken)
+
+		if 'REQUEST_URI' in os.environ:
+			print 'Status: 200'
+			print 'Content-Type: text/plain'
+			print ''
+
+		print "token updated"
+
+		sys.exit(0)
+
 	if 'REQUEST_URI' in os.environ:
 		print 'Status: 200'
 		print 'ETag: "%s"' % int(time.time())