add support for configuring IPFS via the config file...

casimport/__init__.py

@@ -141,16 +141,19 @@ class HTTPSCAS(object):
 		return urlfetch(url)
 
 class IPFSCAS(object):
-	gwhost = 'gateway.ipfs.io'
-	gwhost = 'cloudflare-ipfs.com'
+	gwurl = 'https://gateway.ipfs.io/ipfs/'
+	gwurl = 'https://cloudflare-ipfs.com/ipfs/'
+
+	def __init__(self, gw=None):
+		if gw is not None:
+			self.gwurl = gw
 
 	@classmethod
 	def fromconfig(cls, conf):
-		return cls()
+		return cls(conf.get('gateway', None))
 
 	def make_url(self, url):
-		return urllib.parse.urlunparse(('https', self.gwhost,
-		    '/ipfs/' + url.netloc) + ('', ) * 3)
+		return urllib.parse.urljoin(self.gwurl, url.netloc)
 
 	def fetch_data(self, url):
 		if url.scheme != 'ipfs':
@@ -536,6 +539,14 @@ class Test(unittest.TestCase):
 			# and that the second loader is the IPFSCAS
 			self.assertIsInstance(f._loaders[1], IPFSCAS)
 
+	def test_ipfsgwfromconfig(self):
+		gwurl = 'https://www.example.com/somepath/'
+		ipfsconf = dict(gateway=gwurl)
+		ipfsobj = IPFSCAS.fromconfig(ipfsconf)
+
+		self.assertEqual(ipfsobj.make_url(urllib.parse.urlparse('ipfs://someobj')),
+			'https://www.example.com/somepath/someobj')
+
 	def test_defaultinit(self):
 		temphome = self.tempdir / 'home'
 		temphome.mkdir()