Add Cloudflare ALIAS record support

Translates them to/from root CNAME

README.md

@@ -150,7 +150,7 @@ The above command pulled the existing data out of Route53 and placed the results
 | Provider | Record Support | GeoDNS Support | Notes |
 |--|--|--|--|
 | [AzureProvider](/octodns/provider/azuredns.py) | A, AAAA, CNAME, MX, NS, PTR, SRV, TXT | No | |
-| [CloudflareProvider](/octodns/provider/cloudflare.py) | A, AAAA, CAA, CNAME, MX, NS, SPF, TXT | No | CAA tags restricted |
+| [CloudflareProvider](/octodns/provider/cloudflare.py) | A, AAAA, ALIAS, CAA, CNAME, MX, NS, SPF, TXT | No | CAA tags restricted |
 | [DigitalOceanProvider](/octodns/provider/digitalocean.py) | A, AAAA, CAA, CNAME, MX, NS, TXT, SRV | No | CAA tags restricted |
 | [DnsimpleProvider](/octodns/provider/dnsimple.py) | All | No | CAA tags restricted |
 | [DynProvider](/octodns/provider/dyn.py) | All | Yes | |

octodns/provider/cloudflare.py

@@ -37,7 +37,8 @@ class CloudflareProvider(BaseProvider):
     '''
     SUPPORTS_GEO = False
     # TODO: support SRV
-    SUPPORTS = set(('A', 'AAAA', 'CAA', 'CNAME', 'MX', 'NS', 'SPF', 'TXT'))
+    SUPPORTS = set(('ALIAS', 'A', 'AAAA', 'CAA', 'CNAME', 'MX', 'NS', 'SPF',
+                    'TXT'))
 
     MIN_TTL = 120
     TIMEOUT = 15
@@ -124,6 +125,8 @@ class CloudflareProvider(BaseProvider):
             'value': '{}.'.format(only['content'])
         }
 
+    _data_for_ALIAS = _data_for_CNAME
+
     def _data_for_MX(self, _type, records):
         values = []
         for r in records:
@@ -182,6 +185,11 @@ class CloudflareProvider(BaseProvider):
 
             for name, types in values.items():
                 for _type, records in types.items():
+
+                    # Cloudflare supports ALIAS semantics with root CNAMEs
+                    if _type == 'CNAME' and name == '':
+                        _type = 'ALIAS'
+
                     data_for = getattr(self, '_data_for_{}'.format(_type))
                     data = data_for(_type, records)
                     record = Record.new(zone, name, data, source=self,
@@ -238,6 +246,10 @@ class CloudflareProvider(BaseProvider):
         _type = record._type
         ttl = max(self.MIN_TTL, record.ttl)
 
+        # Cloudflare supports ALIAS semantics with a root CNAME
+        if _type == 'ALIAS':
+            _type = 'CNAME'
+
         contents_for = getattr(self, '_contents_for_{}'.format(_type))
         for content in contents_for(record):
             content.update({

tests/test_octodns_provider_cloudflare.py

@@ -442,3 +442,45 @@ class TestCloudflareProvider(TestCase):
             call('DELETE', '/zones/ff12ab34cd5611334422ab3322997650/'
                  'dns_records/fc12ab34cd5611334422ab3322997653')
         ])
+
+    def test_alias(self):
+        provider = CloudflareProvider('test', 'email', 'token')
+
+        # A CNAME for us to transform to ALIAS
+        provider.zone_records = Mock(return_value=[
+            {
+                "id": "fc12ab34cd5611334422ab3322997642",
+                "type": "CNAME",
+                "name": "unit.tests",
+                "content": "www.unit.tests",
+                "proxiable": True,
+                "proxied": False,
+                "ttl": 300,
+                "locked": False,
+                "zone_id": "ff12ab34cd5611334422ab3322997650",
+                "zone_name": "unit.tests",
+                "modified_on": "2017-03-11T18:01:43.420689Z",
+                "created_on": "2017-03-11T18:01:43.420689Z",
+                "meta": {
+                    "auto_added": False
+                }
+            },
+        ])
+
+        zone = Zone('unit.tests.', [])
+        provider.populate(zone)
+        self.assertEquals(1, len(zone.records))
+        record = list(zone.records)[0]
+        self.assertEquals('', record.name)
+        self.assertEquals('unit.tests.', record.fqdn)
+        self.assertEquals('ALIAS', record._type)
+        self.assertEquals('www.unit.tests.', record.value)
+
+        # Make sure we transform back to CNAME going the other way
+        contents = provider._gen_contents(record)
+        self.assertEquals({
+            'content': u'www.unit.tests.',
+            'name': 'unit.tests',
+            'ttl': 300,
+            'type': 'CNAME'
+        }, list(contents)[0])