Split out the local backend (#2052)

This splits the backend into two parts: the local backend for desktop cellxgene and the AWS backend for hosted cellxgene. The local backend is in local_server while the hosted remains in server. The general idea is to copy everything from server to local_server, pull unneeded stuff out of local_server, and keep server as-is for this PR. Not touching server means all the infra and deployment code will continue working just as it did before so we can make those changes incrementally.

local_server/auth/auth_test.py

@@ -0,0 +1,73 @@
+from local_server.auth.auth import AuthTypeClientBase, AuthTypeFactory
+from flask import session, request, redirect
+
+
+class AuthTypeTest(AuthTypeClientBase):
+    """An authentication type for testing client based logins.  When the login route is accessed
+    the user is automatically logged in with a default or configured username"""
+
+    # key in session token with userid and username
+    CXGUID = "cxguid_test"
+    CXGUNAME = "cxguname_test"
+    CXGUEMAIL = "cxguemail_test"
+    CXGUPICTURE = "cxgupicture_test"
+
+    def __init__(self, app_config):
+        super().__init__()
+        self.user_name = "test_account"
+        self.user_id = "id0001"
+        self.user_email = "test_account@test.com"
+        self.user_picture = None
+
+    def is_valid_authentication_type(self):
+        return True
+
+    def requires_client_login(self):
+        return True
+
+    def add_url_rules(self, app):
+        app.add_url_rule("/login", "login", self.login, methods=["GET"])
+        app.add_url_rule("/logout", "logout", self.logout, methods=["GET"])
+
+    def complete_setup(self, app):
+        pass
+
+    def is_user_authenticated(self):
+        return self.CXGUID in session
+
+    def get_user_id(self):
+        return session.get(self.CXGUID)
+
+    def get_user_name(self):
+        return session.get(self.CXGUNAME)
+
+    def get_user_email(self):
+        return session.get(self.CXGUEMAIL)
+
+    def get_user_picture(self):
+        return session.get(self.CXGUPICTURE)
+
+    def login(self):
+        args = request.args
+        return_to = args.get("dataset", "/")
+        session[self.CXGUID] = args.get("userid", self.user_id)
+        session[self.CXGUNAME] = args.get("username", self.user_name)
+        session[self.CXGUEMAIL] = args.get("email", self.user_email)
+        session[self.CXGUPICTURE] = args.get("picture", self.user_picture)
+        return redirect(return_to)
+
+    def logout(self):
+        session.clear()
+        return_to = request.args.get("dataset", "/")
+        return redirect(return_to)
+
+    def get_login_url(self, data_adaptor):
+        """Return the url for the login route"""
+        return "/login"
+
+    def get_logout_url(self, data_adaptor):
+        """Return the url for the logout route"""
+        return "/logout"
+
+
+AuthTypeFactory.register("test", AuthTypeTest)