initial commit

env/lib/python3.10/site-packages/keyring/backends/chainer.py

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+"""
+Keyring Chainer - iterates over other viable backends to
+discover passwords in each.
+"""
+
+from .. import backend
+from ..compat import properties
+from . import fail
+
+
+class ChainerBackend(backend.KeyringBackend):
+    """
+    >>> ChainerBackend()
+    <keyring.backends.chainer.ChainerBackend object at ...>
+    """
+
+    # override viability as 'priority' cannot be determined
+    # until other backends have been constructed
+    viable = True
+
+    @properties.classproperty
+    def priority(cls) -> float:
+        """
+        If there are backends to chain, high priority
+        Otherwise very low priority since our operation when empty
+        is the same as null.
+        """
+        return 10 if len(cls.backends) > 1 else (fail.Keyring.priority - 1)
+
+    @properties.classproperty
+    def backends(cls):
+        """
+        Discover all keyrings for chaining.
+        """
+
+        def allow(keyring):
+            limit = backend._limit or bool
+            return (
+                not isinstance(keyring, ChainerBackend)
+                and limit(keyring)
+                and keyring.priority > 0
+            )
+
+        allowed = filter(allow, backend.get_all_keyring())
+        return sorted(allowed, key=backend.by_priority, reverse=True)
+
+    def get_password(self, service, username):
+        for keyring in self.backends:
+            password = keyring.get_password(service, username)
+            if password is not None:
+                return password
+
+    def set_password(self, service, username, password):
+        for keyring in self.backends:
+            try:
+                return keyring.set_password(service, username, password)
+            except NotImplementedError:
+                pass
+
+    def delete_password(self, service, username):
+        for keyring in self.backends:
+            try:
+                return keyring.delete_password(service, username)
+            except NotImplementedError:
+                pass
+
+    def get_credential(self, service, username):
+        for keyring in self.backends:
+            credential = keyring.get_credential(service, username)
+            if credential is not None:
+                return credential