Use method initialize to pass settings

handler.py

@@ -21,10 +21,6 @@ DELAY = 3
 
 class MixinHandler(object):
 
-    def __init__(self, *args, **kwargs):
-        self.loop = args[0]._loop
-        super(MixinHandler, self).__init__(*args, **kwargs)
-
     def get_client_addr(self):
         ip = self.request.headers.get('X-Real-Ip')
         port = self.request.headers.get('X-Real-Port')
@@ -40,6 +36,11 @@ class MixinHandler(object):
 
 class IndexHandler(MixinHandler, tornado.web.RequestHandler):
 
+    def initialize(self, loop, policy, host_keys_settings):
+        self.loop = loop
+        self.policy = policy
+        self.host_keys_settings = host_keys_settings
+
     def get_privatekey(self):
         try:
             data = self.request.files.get('privatekey')[0]['body']
@@ -107,10 +108,10 @@ class IndexHandler(MixinHandler, tornado.web.RequestHandler):
 
     def ssh_connect(self):
         ssh = paramiko.SSHClient()
-        ssh._system_host_keys = self.settings['system_host_keys']
-        ssh._host_keys = self.settings['host_keys']
-        ssh._host_keys_filename = self.settings['host_keys_filename']
-        ssh.set_missing_host_key_policy(self.settings['policy'])
+        ssh._system_host_keys = self.host_keys_settings['system_host_keys']
+        ssh._host_keys = self.host_keys_settings['host_keys']
+        ssh._host_keys_filename = self.host_keys_settings['host_keys_filename']
+        ssh.set_missing_host_key_policy(self.policy)
 
         args = self.get_args()
         dst_addr = (args[0], args[1])
@@ -167,9 +168,9 @@ class IndexHandler(MixinHandler, tornado.web.RequestHandler):
 
 class WsockHandler(MixinHandler, tornado.websocket.WebSocketHandler):
 
-    def __init__(self, *args, **kwargs):
+    def initialize(self, loop):
+        self.loop = loop
         self.worker_ref = None
-        super(WsockHandler, self).__init__(*args, **kwargs)
 
     def get_client_addr(self):
         return super(WsockHandler, self).get_client_addr() or self.stream.\

main.py

@@ -2,23 +2,26 @@ import logging
 import tornado.web
 import tornado.ioloop
 
-from tornado.options import parse_command_line, options
+from tornado.options import define, parse_command_line, options
 from handler import IndexHandler, WsockHandler
-from settings import get_application_settings
+from settings import (get_app_settings, get_host_keys_settings,
+                      get_policy_setting)
 
 
 def main():
     parse_command_line()
-    settings = get_application_settings()
+    app_settings = get_app_settings(options)
+    host_keys_settings = get_host_keys_settings(options)
+    policy = get_policy_setting(options, host_keys_settings)
+    loop = tornado.ioloop.IOLoop.current()
 
     handlers = [
-        (r'/',   IndexHandler),
-        (r'/ws', WsockHandler)
+        (r'/', IndexHandler, dict(loop=loop, policy=policy,
+                                  host_keys_settings=host_keys_settings)),
+        (r'/ws', WsockHandler, dict(loop=loop))
     ]
 
-    loop = tornado.ioloop.IOLoop.current()
-    app = tornado.web.Application(handlers, **settings)
-    app._loop = loop
+    app = tornado.web.Application(handlers, **app_settings)
     app.listen(options.port, options.address)
     logging.info('Listening on {}:{}'.format(options.address, options.port))
     loop.start()

policy.py

@@ -35,6 +35,20 @@ def get_policy_class(policy):
     return cls
 
 
+def check_policy_setting(policy_class, host_keys_settings):
+    host_keys = host_keys_settings['host_keys']
+    host_keys_filename = host_keys_settings['host_keys_filename']
+    system_host_keys = host_keys_settings['system_host_keys']
+
+    if policy_class is paramiko.client.AutoAddPolicy:
+        host_keys.save(host_keys_filename)  # for permission test
+    elif policy_class is paramiko.client.RejectPolicy:
+        if not host_keys and not system_host_keys:
+            raise ValueError(
+                'Reject policy could not be used without host keys.'
+            )
+
+
 class AutoAddPolicy(paramiko.client.MissingHostKeyPolicy):
     """
     thread-safe AutoAddPolicy

settings.py

 import logging
 import os.path
 import uuid
-import paramiko
 
-from tornado.options import define, options
-from policy import get_host_keys, get_policy_class
+from tornado.options import define
+from policy import get_host_keys, get_policy_class, check_policy_setting
 
 
 define('address', default='127.0.0.1', help='listen address')
@@ -12,32 +11,47 @@ define('port', default=8888, help='listen port', type=int)
 define('debug', default=False, help='debug mode', type=bool)
 define('policy', default='warning',
        help='missing host key policy, reject|autoadd|warning')
+define('hostFile', default='', help='User-defined host keys file')
+define('sysHostFile', default='', help='System-wide host keys File')
 
 
-def get_application_settings():
-    base_dir = os.path.dirname(__file__)
-    filename = os.path.join(base_dir, 'known_hosts')
-    host_keys = get_host_keys(filename)
-    system_host_keys = get_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
-    policy_class = get_policy_class(options.policy)
-    logging.info(policy_class.__name__)
+base_dir = os.path.dirname(__file__)
 
-    if policy_class is paramiko.client.AutoAddPolicy:
-        host_keys.save(filename)  # for permission test
-    elif policy_class is paramiko.client.RejectPolicy:
-        if not host_keys and not system_host_keys:
-            raise ValueError('Empty known_hosts with reject policy?')
 
+def get_app_settings(options):
     settings = dict(
         template_path=os.path.join(base_dir, 'templates'),
         static_path=os.path.join(base_dir, 'static'),
         cookie_secret=uuid.uuid4().hex,
         xsrf_cookies=True,
-        host_keys=host_keys,
-        host_keys_filename=filename,
-        system_host_keys=system_host_keys,
-        policy=policy_class(),
         debug=options.debug
     )
+    return settings
+
+
+def get_host_keys_settings(options):
+    if not options.hostFile:
+        host_keys_filename = os.path.join(base_dir, 'known_hosts')
+    else:
+        host_keys_filename = options.hostFile
+    host_keys = get_host_keys(host_keys_filename)
+
+    if not options.sysHostFile:
+        filename = os.path.expanduser('~/.ssh/known_hosts')
+    else:
+        filename = options.sysHostFile
+    system_host_keys = get_host_keys(filename)
 
+    settings = dict(
+        host_keys=host_keys,
+        system_host_keys=system_host_keys,
+        host_keys_filename=host_keys_filename
+    )
     return settings
+
+
+def get_policy_setting(options, host_keys_settings):
+    policy_class = get_policy_class(options.policy)
+    logging.info(policy_class.__name__)
+    check_policy_setting(policy_class, host_keys_settings)
+    return policy_class()