Use default phabricator api key to query public revisions

docker-compose.yml

@@ -16,6 +16,7 @@ services:
       - PORT=80
       - VERSION_PATH=/version.json
       - PHABRICATOR_URL=https://mozphab.dev.mozaws.net
+      - PHABRICATOR_UNPRIVILEGED_API_KEY=api-123456789
   py3-linter:
     build:
       context: ./

landoapi/api/revisions.py

@@ -9,7 +9,7 @@
 from landoapi.phabricator_client import PhabricatorClient
 
 
-def get(api_key, revision_id):
+def get(revision_id, api_key=None):
     """ API endpoint at /revisions/{id} to get revision data. """
     phab = PhabricatorClient(api_key)
     revision = phab.get_revision(id=revision_id)

landoapi/phabricator_client.py

@@ -18,7 +18,10 @@ class PhabricatorClient:
 
     def __init__(self, api_key):
         self.api_url = os.getenv('PHABRICATOR_URL') + '/api'
-        self.api_key = api_key
+        if api_key:
+            self.api_key = api_key
+        else:
+            self.api_key = os.getenv('PHABRICATOR_UNPRIVILEGED_API_KEY')
 
     def get_revision(self, id=None, phid=None):
         """ Gets a revision as defined by the Phabricator API.

landoapi/spec/swagger.yml

@@ -33,8 +33,10 @@ paths:
           in: query
           type: string
           description: |
-            A Phabricator Conduit API key to use to get the revision.
-          required: true
+            A Phabricator Conduit API key to use to get the revision. If not
+            provided, then a default api key capable of getting public revisions
+            only will be used instead.
+          required: false
       responses:
         200:
           description: OK