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scicat/authmixin.py

@@ -0,0 +1,52 @@
+import getpass
+from abc import ABC, abstractmethod
+from .config import Config
+from .utils import typename
+
+
+HEADER_JSON = {
+    "Content-type": "application/json",
+    "Accept":       "application/json"
+}
+
+
+class AuthMixin(ABC):
+
+    def __init__(self, address):
+        self.address = address.rstrip("/")
+        self._token = None
+        tn = typename(self).lower()
+        self.config = Config(f".{tn}-tokens")
+
+    def __repr__(self):
+        tn = typename(self)
+        return f"{tn} @ {self.address}"
+
+    @abstractmethod
+    def authenticate(self, username, password):
+        raise NotImplementedError
+
+    @property
+    def token(self):
+        return self._retrieve_token()
+
+    def _retrieve_token(self):
+        username = input("Username: ")
+        token = self._token
+        if token is None:
+            try:
+                token = self.config[username]
+            except KeyError:
+                tn = typename(self)
+                password = getpass.getpass(prompt=f"{tn} password for {username}: ")
+                token = self.authenticate(username, password)
+        self.config[username] = self._token = token
+        return token
+
+
+
+class AuthError(Exception):
+    pass
+
+
+