610 lines
25 KiB
Python
610 lines
25 KiB
Python
import asyncio
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import logging
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from six.moves.urllib import parse as urlparse
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import json
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import inspect
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import signal
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from functools import wraps
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from twisted.web import server
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from twisted.internet import defer
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from twisted.internet.defer import Deferred
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from twisted.python.failure import Failure
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from twisted.internet.error import ConnectionDone, ConnectionLost
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from txjsonrpc import jsonrpclib
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from traceback import format_exc
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from lbrynet import conf, analytics
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from lbrynet.core.Error import InvalidAuthenticationToken
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from lbrynet.core import utils
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from lbrynet.core.Error import ComponentsNotStarted, ComponentStartConditionNotMet
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from lbrynet.core.looping_call_manager import LoopingCallManager
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from lbrynet.daemon.ComponentManager import ComponentManager
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from .keyring import APIKey, Keyring
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from .undecorated import undecorated
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from .factory import AuthJSONRPCResource
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from lbrynet.daemon.json_response_encoder import JSONResponseEncoder
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log = logging.getLogger(__name__)
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EMPTY_PARAMS = [{}]
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LBRY_SECRET = "LBRY_SECRET"
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class JSONRPCError:
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# http://www.jsonrpc.org/specification#error_object
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CODE_PARSE_ERROR = -32700 # Invalid JSON. Error while parsing the JSON text.
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CODE_INVALID_REQUEST = -32600 # The JSON sent is not a valid Request object.
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CODE_METHOD_NOT_FOUND = -32601 # The method does not exist / is not available.
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CODE_INVALID_PARAMS = -32602 # Invalid method parameter(s).
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CODE_INTERNAL_ERROR = -32603 # Internal JSON-RPC error (I think this is like a 500?)
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CODE_APPLICATION_ERROR = -32500 # Generic error with our app??
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CODE_AUTHENTICATION_ERROR = -32501 # Authentication failed
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MESSAGES = {
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CODE_PARSE_ERROR: "Parse Error. Data is not valid JSON.",
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CODE_INVALID_REQUEST: "JSON data is not a valid Request",
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CODE_METHOD_NOT_FOUND: "Method Not Found",
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CODE_INVALID_PARAMS: "Invalid Params",
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CODE_INTERNAL_ERROR: "Internal Error",
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CODE_AUTHENTICATION_ERROR: "Authentication Failed",
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}
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HTTP_CODES = {
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CODE_INVALID_REQUEST: 400,
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CODE_PARSE_ERROR: 400,
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CODE_INVALID_PARAMS: 400,
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CODE_METHOD_NOT_FOUND: 404,
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CODE_INTERNAL_ERROR: 500,
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CODE_APPLICATION_ERROR: 500,
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CODE_AUTHENTICATION_ERROR: 401,
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}
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def __init__(self, message, code=CODE_APPLICATION_ERROR, traceback=None, data=None):
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assert isinstance(code, int), "'code' must be an int"
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assert (data is None or isinstance(data, dict)), "'data' must be None or a dict"
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self.code = code
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if message is None:
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message = self.MESSAGES[code] if code in self.MESSAGES else "API Error"
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self.message = message
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self.data = {} if data is None else data
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self.traceback = []
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if traceback is not None:
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trace_lines = traceback.split("\n")
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for i, t in enumerate(trace_lines):
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if "--- <exception caught here> ---" in t:
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if len(trace_lines) > i + 1:
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self.traceback = [j for j in trace_lines[i+1:] if j]
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break
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def to_dict(self):
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return {
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'code': self.code,
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'message': self.message,
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'data': self.traceback
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}
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@classmethod
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def create_from_exception(cls, message, code=CODE_APPLICATION_ERROR, traceback=None):
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return cls(message, code=code, traceback=traceback)
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class UnknownAPIMethodError(Exception):
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pass
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def trap(err, *to_trap):
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err.trap(*to_trap)
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def jsonrpc_dumps_pretty(obj, **kwargs):
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try:
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id_ = kwargs.pop("id")
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except KeyError:
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id_ = None
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if isinstance(obj, JSONRPCError):
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data = {"jsonrpc": "2.0", "error": obj.to_dict(), "id": id_}
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else:
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data = {"jsonrpc": "2.0", "result": obj, "id": id_}
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return json.dumps(data, cls=JSONResponseEncoder, sort_keys=True, indent=2, **kwargs) + "\n"
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class JSONRPCServerType(type):
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def __new__(mcs, name, bases, newattrs):
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klass = type.__new__(mcs, name, bases, newattrs)
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klass.callable_methods = {}
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klass.deprecated_methods = {}
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for methodname in dir(klass):
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if methodname.startswith("jsonrpc_"):
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method = getattr(klass, methodname)
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if not hasattr(method, '_deprecated'):
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klass.callable_methods.update({methodname.split("jsonrpc_")[1]: method})
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else:
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klass.deprecated_methods.update({methodname.split("jsonrpc_")[1]: method})
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return klass
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class AuthorizedBase(metaclass=JSONRPCServerType):
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@staticmethod
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def deprecated(new_command=None):
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def _deprecated_wrapper(f):
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f.new_command = new_command
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f._deprecated = True
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return f
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return _deprecated_wrapper
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@staticmethod
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def requires(*components, **conditions):
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if conditions and ["conditions"] != list(conditions.keys()):
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raise SyntaxError("invalid conditions argument")
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condition_names = conditions.get("conditions", [])
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def _wrap(fn):
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@wraps(fn)
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def _inner(*args, **kwargs):
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component_manager = args[0].component_manager
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for condition_name in condition_names:
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condition_result, err_msg = component_manager.evaluate_condition(condition_name)
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if not condition_result:
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raise ComponentStartConditionNotMet(err_msg)
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if not component_manager.all_components_running(*components):
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raise ComponentsNotStarted("the following required components have not yet started: "
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"%s" % json.dumps(components))
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return fn(*args, **kwargs)
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return _inner
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return _wrap
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class AuthJSONRPCServer(AuthorizedBase):
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"""
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Authorized JSONRPC server used as the base class for the LBRY API
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API methods are named with a leading "jsonrpc_"
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Attributes:
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sessions (dict): (dict): {<session id>: <lbrynet.daemon.auth.util.APIKey>}
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callable_methods (dict): {<api method name>: <api method>}
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Authentication:
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If use_authentication is true, basic HTTP and HMAC authentication will be used for all requests and the
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service url will require a username and password.
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To start an authenticated session a client sends an HTTP POST to <user>:<password>@<api host>:<api port>.
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If accepted, the server replies with a TWISTED_SESSION cookie containing a session id and the message "OK".
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The client initializes their shared secret for hmac to be the b64 encoded sha256 of their session id.
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To send an authenticated request a client sends an HTTP POST to the auth api url with the TWISTED_SESSION
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cookie and includes a hmac token in the message using the previously set shared secret. If the token is valid
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the server will randomize the shared secret and return the new value under the LBRY_SECRET header, which the
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client uses to generate the token for their next request.
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"""
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#implements(resource.IResource)
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isLeaf = True
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allowed_during_startup = []
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component_attributes = {}
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def __init__(self, analytics_manager=None, component_manager=None, use_authentication=None, use_https=None,
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to_skip=None, looping_calls=None, reactor=None):
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if not reactor:
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from twisted.internet import reactor
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self.analytics_manager = analytics_manager or analytics.Manager.new_instance()
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self.component_manager = component_manager or ComponentManager(
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analytics_manager=self.analytics_manager,
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skip_components=to_skip or [],
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reactor=reactor
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)
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self.looping_call_manager = LoopingCallManager({n: lc for n, (lc, t) in (looping_calls or {}).items()})
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self._looping_call_times = {n: t for n, (lc, t) in (looping_calls or {}).items()}
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self._use_authentication = use_authentication or conf.settings['use_auth_http']
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self._use_https = use_https or conf.settings['use_https']
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self.listening_port = None
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self._component_setup_deferred = None
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self.announced_startup = False
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self.sessions = {}
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self.server = None
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self.keyring = Keyring.generate_and_save()
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@defer.inlineCallbacks
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def start_listening(self):
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from twisted.internet import reactor, error as tx_error
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try:
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self.server = self.get_server_factory()
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if self.server.use_ssl:
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log.info("Using SSL")
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self.listening_port = reactor.listenSSL(
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conf.settings['api_port'], self.server, self.server.options, interface=conf.settings['api_host']
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)
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else:
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log.info("Not using SSL")
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self.listening_port = reactor.listenTCP(
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conf.settings['api_port'], self.server, interface=conf.settings['api_host']
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)
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log.info("lbrynet API listening on TCP %s:%i", conf.settings['api_host'], conf.settings['api_port'])
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yield self.setup()
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self.analytics_manager.send_server_startup_success()
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except tx_error.CannotListenError:
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log.error('lbrynet API failed to bind TCP %s:%i for listening. Daemon is already running or this port is '
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'already in use by another application.', conf.settings['api_host'], conf.settings['api_port'])
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reactor.fireSystemEvent("shutdown")
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except defer.CancelledError:
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log.info("shutting down before finished starting")
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reactor.fireSystemEvent("shutdown")
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except Exception as err:
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self.analytics_manager.send_server_startup_error(str(err))
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log.exception('Failed to start lbrynet-daemon')
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reactor.fireSystemEvent("shutdown")
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def setup(self):
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from twisted.internet import reactor
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reactor.addSystemEventTrigger('before', 'shutdown', self._shutdown)
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if not self.analytics_manager.is_started:
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self.analytics_manager.start()
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self.analytics_manager.send_server_startup()
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for lc_name, lc_time in self._looping_call_times.items():
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self.looping_call_manager.start(lc_name, lc_time)
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def update_attribute(setup_result, component):
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setattr(self, self.component_attributes[component.component_name], component.component)
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kwargs = {component: update_attribute for component in self.component_attributes.keys()}
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self._component_setup_deferred = self.component_manager.setup(**kwargs)
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return self._component_setup_deferred
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@staticmethod
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def _already_shutting_down(sig_num, frame):
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log.info("Already shutting down")
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def _shutdown(self):
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# ignore INT/TERM signals once shutdown has started
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signal.signal(signal.SIGINT, self._already_shutting_down)
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signal.signal(signal.SIGTERM, self._already_shutting_down)
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if self.listening_port:
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self.listening_port.stopListening()
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self.looping_call_manager.shutdown()
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if self.server is not None:
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for session in list(self.server.sessions.values()):
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session.expire()
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if self.analytics_manager:
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self.analytics_manager.shutdown()
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try:
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self._component_setup_deferred.cancel()
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except (AttributeError, defer.CancelledError):
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pass
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if self.component_manager is not None:
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d = self.component_manager.stop()
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d.addErrback(log.fail(), 'Failure while shutting down')
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else:
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d = defer.succeed(None)
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return d
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def get_server_factory(self):
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return AuthJSONRPCResource(self).getServerFactory(self.keyring, self._use_authentication, self._use_https)
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def _set_headers(self, request, data, update_secret=False):
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if conf.settings['allowed_origin']:
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request.setHeader("Access-Control-Allow-Origin", conf.settings['allowed_origin'])
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request.setHeader("Content-Type", "application/json")
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request.setHeader("Accept", "application/json-rpc")
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request.setHeader("Content-Length", str(len(data)))
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if update_secret:
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session_id = request.getSession().uid
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request.setHeader(LBRY_SECRET, self.sessions.get(session_id).secret)
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@staticmethod
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def _render_message(request, message: str):
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request.write(message.encode())
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request.finish()
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def _render_error(self, failure, request, id_):
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if isinstance(failure, JSONRPCError):
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error = failure
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elif isinstance(failure, Failure):
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# maybe failure is JSONRPCError wrapped in a twisted Failure
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error = failure.check(JSONRPCError)
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if error is None:
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# maybe its a twisted Failure with another type of error
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if hasattr(failure.type, "code"):
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error_code = failure.type.code
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else:
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error_code = JSONRPCError.CODE_APPLICATION_ERROR
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error = JSONRPCError.create_from_exception(
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failure.getErrorMessage() or failure.type.__name__,
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code=error_code,
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traceback=failure.getTraceback()
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)
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if not failure.check(ComponentsNotStarted, ComponentStartConditionNotMet):
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log.warning("error processing api request: %s\ntraceback: %s", error.message,
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"\n".join(error.traceback))
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else:
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# last resort, just cast it as a string
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error = JSONRPCError(str(failure))
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response_content = jsonrpc_dumps_pretty(error, id=id_, ledger=self.ledger)
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self._set_headers(request, response_content)
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request.setResponseCode(200)
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self._render_message(request, response_content)
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@staticmethod
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def _handle_dropped_request(result, d, function_name):
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if not d.called:
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log.warning("Cancelling dropped api request %s", function_name)
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d.cancel()
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def render(self, request):
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try:
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return self._render(request)
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except BaseException as e:
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log.error(e)
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error = JSONRPCError.create_from_exception(str(e), traceback=format_exc())
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self._render_error(error, request, None)
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return server.NOT_DONE_YET
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def _render(self, request):
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time_in = utils.now()
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# if not self._check_headers(request):
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# self._render_error(Failure(InvalidHeaderError()), request, None)
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# return server.NOT_DONE_YET
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session = request.getSession()
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session_id = session.uid
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finished_deferred = request.notifyFinish()
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if self._use_authentication:
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# if this is a new session, send a new secret and set the expiration
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# otherwise, session.touch()
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if self._initialize_session(session_id):
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def expire_session():
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self._unregister_user_session(session_id)
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session.notifyOnExpire(expire_session)
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message = "OK"
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request.setResponseCode(200)
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self._set_headers(request, message, True)
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self._render_message(request, message)
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return server.NOT_DONE_YET
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else:
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session.touch()
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request.content.seek(0, 0)
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content = request.content.read().decode()
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try:
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parsed = jsonrpclib.loads(content)
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except json.JSONDecodeError:
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log.warning("Unable to decode request json")
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self._render_error(JSONRPCError(None, code=JSONRPCError.CODE_PARSE_ERROR), request, None)
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return server.NOT_DONE_YET
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request_id = None
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try:
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function_name = parsed.get('method')
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args = parsed.get('params', {})
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request_id = parsed.get('id', None)
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token = parsed.pop('hmac', None)
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except AttributeError as err:
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log.warning(err)
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self._render_error(
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JSONRPCError(None, code=JSONRPCError.CODE_INVALID_REQUEST), request, request_id
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)
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return server.NOT_DONE_YET
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reply_with_next_secret = False
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if self._use_authentication:
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try:
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self._verify_token(session_id, parsed, token)
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except InvalidAuthenticationToken as err:
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log.warning("API validation failed")
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self._render_error(
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JSONRPCError.create_from_exception(
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str(err),
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code=JSONRPCError.CODE_AUTHENTICATION_ERROR,
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traceback=format_exc()
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),
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request, request_id
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)
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return server.NOT_DONE_YET
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request.addCookie("TWISTED_SESSION", session_id)
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self._update_session_secret(session_id)
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reply_with_next_secret = True
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try:
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fn = self._get_jsonrpc_method(function_name)
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except UnknownAPIMethodError as err:
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log.warning('Failed to get function %s: %s', function_name, err)
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self._render_error(
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JSONRPCError(None, code=JSONRPCError.CODE_METHOD_NOT_FOUND),
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request, request_id
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)
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return server.NOT_DONE_YET
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if args in (EMPTY_PARAMS, []):
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_args, _kwargs = (), {}
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elif isinstance(args, dict):
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_args, _kwargs = (), args
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elif len(args) == 1 and isinstance(args[0], dict):
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# TODO: this is for backwards compatibility. Remove this once API and UI are updated
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# TODO: also delete EMPTY_PARAMS then
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_args, _kwargs = (), args[0]
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elif len(args) == 2 and isinstance(args[0], list) and isinstance(args[1], dict):
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_args, _kwargs = args
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else:
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raise ValueError('invalid args format')
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params_error, erroneous_params = self._check_params(fn, _args, _kwargs)
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if params_error is not None:
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params_error_message = '{} for {} command: {}'.format(
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params_error, function_name, ', '.join(erroneous_params)
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)
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log.warning(params_error_message)
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self._render_error(
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JSONRPCError(params_error_message, code=JSONRPCError.CODE_INVALID_PARAMS),
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request, request_id
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)
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return server.NOT_DONE_YET
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try:
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result = fn(self, *_args, **_kwargs)
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if isinstance(result, Deferred):
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d = result
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elif isinstance(result, Failure):
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d = defer.fail(result)
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elif asyncio.iscoroutine(result):
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d = Deferred.fromFuture(asyncio.ensure_future(result))
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else:
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d = defer.succeed(result)
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except:
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d = defer.fail(Failure(captureVars=Deferred.debug))
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# finished_deferred will callback when the request is finished
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# and errback if something went wrong. If the errback is
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# called, cancel the deferred stack. This is to prevent
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# request.finish() from being called on a closed request.
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finished_deferred.addErrback(self._handle_dropped_request, d, function_name)
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d.addCallback(self._callback_render, request, request_id, reply_with_next_secret)
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d.addErrback(trap, ConnectionDone, ConnectionLost, defer.CancelledError)
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d.addErrback(self._render_error, request, request_id)
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d.addBoth(lambda _: log.debug("%s took %f",
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function_name,
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(utils.now() - time_in).total_seconds()))
|
|
return server.NOT_DONE_YET
|
|
|
|
def _register_user_session(self, session_id):
|
|
"""
|
|
Add or update a HMAC secret for a session
|
|
|
|
@param session_id:
|
|
@return: secret
|
|
"""
|
|
log.info("Started new api session")
|
|
token = APIKey.create(seed=session_id)
|
|
self.sessions.update({session_id: token})
|
|
|
|
def _unregister_user_session(self, session_id):
|
|
log.info("Unregister API session")
|
|
del self.sessions[session_id]
|
|
|
|
def _check_headers(self, request):
|
|
return (
|
|
self._check_header_source(request, 'Origin') and
|
|
self._check_header_source(request, 'Referer')
|
|
)
|
|
|
|
def _check_header_source(self, request, header):
|
|
"""Check if the source of the request is allowed based on the header value."""
|
|
source = request.getHeader(header)
|
|
if not self._check_source_of_request(source):
|
|
log.warning("Attempted api call from invalid %s: %s", header, source)
|
|
return False
|
|
return True
|
|
|
|
def _check_source_of_request(self, source):
|
|
if source is None:
|
|
return True
|
|
if conf.settings['api_host'] == '0.0.0.0':
|
|
return True
|
|
server, port = self.get_server_port(source)
|
|
return self._check_server_port(server, port)
|
|
|
|
def _check_server_port(self, server, port):
|
|
api = (conf.settings['api_host'], conf.settings['api_port'])
|
|
return (server, port) == api or self._is_from_allowed_origin(server, port)
|
|
|
|
def _is_from_allowed_origin(self, server, port):
|
|
allowed_origin = conf.settings['allowed_origin']
|
|
if not allowed_origin:
|
|
return False
|
|
if allowed_origin == '*':
|
|
return True
|
|
allowed_server, allowed_port = self.get_server_port(allowed_origin)
|
|
return (allowed_server, allowed_port) == (server, port)
|
|
|
|
def get_server_port(self, origin):
|
|
parsed = urlparse.urlparse(origin)
|
|
server_port = parsed.netloc.split(':')
|
|
assert len(server_port) <= 2
|
|
if len(server_port) == 2:
|
|
return server_port[0], int(server_port[1])
|
|
else:
|
|
return server_port[0], 80
|
|
|
|
def _verify_method_is_callable(self, function_path):
|
|
if function_path not in self.callable_methods:
|
|
raise UnknownAPIMethodError(function_path)
|
|
|
|
def _get_jsonrpc_method(self, function_path):
|
|
if function_path in self.deprecated_methods:
|
|
new_command = self.deprecated_methods[function_path].new_command
|
|
log.warning('API function \"%s\" is deprecated, please update to use \"%s\"',
|
|
function_path, new_command)
|
|
function_path = new_command
|
|
self._verify_method_is_callable(function_path)
|
|
return self.callable_methods.get(function_path)
|
|
|
|
@staticmethod
|
|
def _check_params(function, args_tup, args_dict):
|
|
argspec = inspect.getfullargspec(undecorated(function))
|
|
num_optional_params = 0 if argspec.defaults is None else len(argspec.defaults)
|
|
|
|
duplicate_params = [
|
|
duplicate_param
|
|
for duplicate_param in argspec.args[1:len(args_tup) + 1]
|
|
if duplicate_param in args_dict
|
|
]
|
|
|
|
if duplicate_params:
|
|
return 'Duplicate parameters', duplicate_params
|
|
|
|
missing_required_params = [
|
|
required_param
|
|
for required_param in argspec.args[len(args_tup)+1:-num_optional_params]
|
|
if required_param not in args_dict
|
|
]
|
|
if len(missing_required_params):
|
|
return 'Missing required parameters', missing_required_params
|
|
|
|
extraneous_params = [] if argspec.varkw is not None else [
|
|
extra_param
|
|
for extra_param in args_dict
|
|
if extra_param not in argspec.args[1:]
|
|
]
|
|
if len(extraneous_params):
|
|
return 'Extraneous parameters', extraneous_params
|
|
|
|
return None, None
|
|
|
|
def _initialize_session(self, session_id):
|
|
if not self.sessions.get(session_id):
|
|
self._register_user_session(session_id)
|
|
return True
|
|
return False
|
|
|
|
def _verify_token(self, session_id, message, token):
|
|
if token is None:
|
|
raise InvalidAuthenticationToken('Authentication token not found')
|
|
to_auth = json.dumps(message, sort_keys=True)
|
|
api_key = self.sessions.get(session_id)
|
|
if not api_key.compare_hmac(to_auth, token):
|
|
raise InvalidAuthenticationToken('Invalid authentication token')
|
|
|
|
def _update_session_secret(self, session_id):
|
|
self.sessions.update({session_id: APIKey.create(name=session_id)})
|
|
|
|
def _callback_render(self, result, request, id_, auth_required=False):
|
|
try:
|
|
message = jsonrpc_dumps_pretty(result, id=id_, ledger=self.ledger)
|
|
request.setResponseCode(200)
|
|
self._set_headers(request, message, auth_required)
|
|
self._render_message(request, message)
|
|
except Exception as err:
|
|
log.exception("Failed to render API response: %s", result)
|
|
self._render_error(err, request, id_)
|
|
|
|
@staticmethod
|
|
def _render_response(result):
|
|
return defer.succeed(result)
|