Add ability to override key used to authenticate with Polygon

Author: ttt733

alpaca_trade_api/common.py

@@ -23,6 +23,13 @@ def get_credentials(key_id=None, secret_key=None):
     return key_id, secret_key
 
 
+def get_polygon_credentials(alpaca_key=None):
+    key_id = os.environ.get('POLYGON_KEY_ID') or alpaca_key
+    if key_id is None:
+        raise ValueError('Key ID must be given to access Polygon API')
+    return key_id
+
+
 def get_api_version(api_version):
     api_version = api_version or os.environ.get('APCA_API_VERSION')
     if api_version is None:

alpaca_trade_api/polygon/rest.py

@@ -6,6 +6,7 @@
     Exchange, SymbolTypeMap, ConditionMap,
     Company, Dividends, Splits, Earnings, Financials, NewsList, Ticker
 )
+from alpaca_trade_api.common import get_polygon_credentials
 
 
 def _is_list_like(o):
@@ -15,6 +16,7 @@ def _is_list_like(o):
 class REST(object):
 
     def __init__(self, api_key, staging=False):
+        self._api_key = get_polygon_credentials(api_key)
         self._api_key = api_key
         self._staging = staging
         self._session = requests.Session()

alpaca_trade_api/polygon/stream2.py

@@ -7,12 +7,13 @@
 from .entity import (
     Quote, Trade, Agg, Entity,
 )
+from alpaca_trade_api.common import get_polygon_credentials
 import logging
 
 
 class StreamConn(object):
     def __init__(self, key_id=None):
-        self._key_id = key_id or os.environ.get('APCA_API_KEY_ID')
+        self._key_id = get_polygon_credentials(key_id)
         self._endpoint = os.environ.get(
             'POLYGON_WS_URL',
             'wss://alpaca.socket.polygon.io/stocks'