Introduced authenticator

clipper/auth.py

@@ -0,0 +1,28 @@
+import requests
+
+TOKEN_URL = "https://id.twitch.tv/oauth2/token?client_id={0}&client_secret={1}&grant_type=client_credentials"
+
+
+class TwitchAuthenticator:
+    cached_token = None
+
+    def __init__(self, client_id, client_secret):
+        self.client_id = client_id
+        self.client_secret = client_secret
+        self.token_url = TOKEN_URL.format(self.client_id, self.client_secret)
+
+    def get_token(self):
+        if self.cached_token is None:
+            self._fetch_token()
+
+        return self.cached_token
+
+    def refresh_token(self):
+        self._fetch_token()
+        return self.cached_token
+
+    def _fetch_token(self):
+        token_response = requests.post(self.token_url, timeout=15)
+        token_response.raise_for_status()
+        token = token_response.json()
+        self.cached_token = token["access_token"]