Add Reddit.auth.url.

praw/models/auth.py

@@ -31,3 +31,24 @@ def implicit(self, access_token, expires_in, scope):
         implicit_session = session(ImplicitAuthorizer(
             authenticator, access_token, expires_in, scope))
         self._reddit._core = self._reddit._authorized_core = implicit_session
+
+    def url(self, scopes, state, duration=None):
+        """Return the URL used out-of-band to grant access to your application.
+
+        :param scopes: A list of OAuth scopes to request authorization for.
+        :param state: A string that will be reflected in the callback to
+            ``redirect_uri``. This value should be temporarily unique to the
+            client for whom the URL was generated for.
+        :param duration: (web app only) Either ``permanent`` or
+            ``temporary``. ``temporary`` authorizations generate access tokens
+            that last only 1 hour. ``permanent`` authorizations additionally
+            generate a refresh token that can be indefinitely used to generate
+            new hour-long access tokens.
+
+        """
+        authenticator = self._reddit._read_only_core._authorizer._authenticator
+        if isinstance(authenticator, UntrustedAuthenticator):
+            if duration is not None:
+                raise ClientException('installed apps cannot specify duration')
+            return authenticator.authorize_url(scopes, state)
+        return authenticator.authorize_url(duration, scopes, state)