# -*- coding: utf-8 -*- # Copyright © 2012-2014 Zulip, Inc. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. from __future__ import print_function from __future__ import absolute_import from __future__ import division import simplejson import requests import time import traceback import sys import os import optparse import platform import random from distutils.version import LooseVersion from six.moves.configparser import SafeConfigParser from six.moves import urllib import logging import six from typing import Any, Callable, Dict, Mapping, Optional, Tuple, Union __version__ = "0.2.5" logger = logging.getLogger(__name__) # Check that we have a recent enough version # Older versions don't provide the 'json' attribute on responses. assert(LooseVersion(requests.__version__) >= LooseVersion('0.12.1')) # In newer versions, the 'json' attribute is a function, not a property requests_json_is_function = callable(requests.Response.json) API_VERSTRING = "v1/" class CountingBackoff(object): def __init__(self, maximum_retries=10, timeout_success_equivalent=None): # type: (int, Optional[float]) -> None self.number_of_retries = 0 self.maximum_retries = maximum_retries self.timeout_success_equivalent = timeout_success_equivalent self.last_attempt_time = 0.0 def keep_going(self): # type: () -> bool self._check_success_timeout() return self.number_of_retries < self.maximum_retries def succeed(self): # type: () -> None self.number_of_retries = 0 self.last_attempt_time = time.time() def fail(self): # type: () -> None self._check_success_timeout() self.number_of_retries = min(self.number_of_retries + 1, self.maximum_retries) self.last_attempt_time = time.time() def _check_success_timeout(self): # type: () -> None if (self.timeout_success_equivalent is not None and self.last_attempt_time != 0 and time.time() - self.last_attempt_time > self.timeout_success_equivalent): self.number_of_retries = 0 class RandomExponentialBackoff(CountingBackoff): def fail(self): # type: () -> None super(RandomExponentialBackoff, self).fail() # Exponential growth with ratio sqrt(2); compute random delay # between x and 2x where x is growing exponentially delay_scale = int(2 ** (self.number_of_retries / 2.0 - 1)) + 1 delay = delay_scale + random.randint(1, delay_scale) message = "Sleeping for %ss [max %s] before retrying." % (delay, delay_scale * 2) try: logger.warning(message) except NameError: print(message) time.sleep(delay) def _default_client(): # type: () -> str return "ZulipPython/" + __version__ def generate_option_group(parser, prefix=''): # type: (optparse.OptionParser, str) -> optparse.OptionGroup group = optparse.OptionGroup(parser, 'Zulip API configuration') group.add_option('--%ssite' % (prefix,), dest="zulip_site", help="Zulip server URI", default=None) group.add_option('--%sapi-key' % (prefix,), dest="zulip_api_key", action='store') group.add_option('--%suser' % (prefix,), dest='zulip_email', help='Email address of the calling bot or user.') group.add_option('--%sconfig-file' % (prefix,), action='store', dest="zulip_config_file", help='Location of an ini file containing the\nabove information. (default ~/.zuliprc)') group.add_option('-v', '--verbose', action='store_true', help='Provide detailed output.') group.add_option('--%sclient' % (prefix,), action='store', default=None, dest="zulip_client", help=optparse.SUPPRESS_HELP) group.add_option('--insecure', action='store_true', dest='insecure', help='''Do not verify the server certificate. The https connection will not be secure.''') group.add_option('--cert-bundle', action='store', dest='cert_bundle', help='''Specify a file containing either the server certificate, or a set of trusted CA certificates. This will be used to verify the server's identity. All certificates should be PEM encoded.''') group.add_option('--client-cert', action='store', dest='client_cert', help='''Specify a file containing a client certificate (not needed for most deployments).''') group.add_option('--client-cert-key', action='store', dest='client_cert_key', help='''Specify a file containing the client certificate's key (if it is in a separate file).''') return group def init_from_options(options, client=None): # type: (Any, Optional[str]) -> Client if options.zulip_client is not None: client = options.zulip_client elif client is None: client = _default_client() return Client(email=options.zulip_email, api_key=options.zulip_api_key, config_file=options.zulip_config_file, verbose=options.verbose, site=options.zulip_site, client=client, cert_bundle=options.cert_bundle, insecure=options.insecure, client_cert=options.client_cert, client_cert_key=options.client_cert_key) def get_default_config_filename(): # type: () -> str config_file = os.path.join(os.environ["HOME"], ".zuliprc") if (not os.path.exists(config_file) and os.path.exists(os.path.join(os.environ["HOME"], ".humbugrc"))): raise RuntimeError("The Zulip API configuration file is now ~/.zuliprc; please run:\n\n" " mv ~/.humbugrc ~/.zuliprc\n") return config_file class Client(object): def __init__(self, email=None, api_key=None, config_file=None, verbose=False, retry_on_errors=True, site=None, client=None, cert_bundle=None, insecure=None, client_cert=None, client_cert_key=None): # type: (Optional[str], Optional[str], Optional[str], bool, bool, Optional[str], Optional[str], Optional[str], bool, Optional[str], Optional[str]) -> None if client is None: client = _default_client() if config_file is None: config_file = get_default_config_filename() if os.path.exists(config_file): config = SafeConfigParser() with open(config_file, 'r') as f: config.readfp(f, config_file) if api_key is None: api_key = config.get("api", "key") if email is None: email = config.get("api", "email") if site is None and config.has_option("api", "site"): site = config.get("api", "site") if client_cert is None and config.has_option("api", "client_cert"): client_cert = config.get("api", "client_cert") if client_cert_key is None and config.has_option("api", "client_cert_key"): client_cert_key = config.get("api", "client_cert_key") if cert_bundle is None and config.has_option("api", "cert_bundle"): cert_bundle = config.get("api", "cert_bundle") if insecure is None and config.has_option("api", "insecure"): # Be quite strict about what is accepted so that users don't # disable security unintentionally. insecure_setting = config.get("api", "insecure").lower() if insecure_setting == "true": insecure = True elif insecure_setting == "false": insecure = False else: raise RuntimeError("insecure is set to '%s', it must be 'true' or 'false' if it is used in %s" % (insecure_setting, config_file)) elif None in (api_key, email): raise RuntimeError("api_key or email not specified and %s does not exist" % (config_file,)) self.api_key = api_key self.email = email self.verbose = verbose if site is not None: if site.startswith("localhost"): site = "http://" + site elif not site.startswith("http"): site = "https://" + site # Remove trailing "/"s from site to simplify the below logic for adding "/api" site = site.rstrip("/") self.base_url = site else: raise RuntimeError("Missing Zulip server URL; specify via --site or ~/.zuliprc.") if not self.base_url.endswith("/api"): self.base_url += "/api" self.base_url += "/" self.retry_on_errors = retry_on_errors self.client_name = client if insecure: self.tls_verification = False # type: Union[bool, str] elif cert_bundle is not None: if not os.path.isfile(cert_bundle): raise RuntimeError("tls bundle '%s' does not exist" % (cert_bundle,)) self.tls_verification = cert_bundle else: # Default behavior: verify against system CA certificates self.tls_verification = True if client_cert is None: if client_cert_key is not None: raise RuntimeError("client cert key '%s' specified, but no client cert public part provided" % (client_cert_key,)) else: # we have a client cert if not os.path.isfile(client_cert): raise RuntimeError("client cert '%s' does not exist" % (client_cert,)) if client_cert_key is not None: if not os.path.isfile(client_cert_key): raise RuntimeError("client cert key '%s' does not exist" % (client_cert_key,)) self.client_cert = client_cert self.client_cert_key = client_cert_key def get_user_agent(self): # type: () -> str vendor = '' vendor_version = '' try: vendor = platform.system() vendor_version = platform.release() except IOError: # If the calling process is handling SIGCHLD, platform.system() can # fail with an IOError. See http://bugs.python.org/issue9127 pass if vendor == "Linux": vendor, vendor_version, dummy = platform.linux_distribution() elif vendor == "Windows": vendor_version = platform.win32_ver()[1] elif vendor == "Darwin": vendor_version = platform.mac_ver()[0] return "{client_name} ({vendor}; {vendor_version})".format( client_name=self.client_name, vendor=vendor, vendor_version=vendor_version, ) def do_api_query(self, orig_request, url, method="POST", longpolling = False): # type: (Mapping[str, Any], str, str, bool) -> Dict[str, Any] request = {} for (key, val) in six.iteritems(orig_request): if isinstance(val, str) or isinstance(val, six.text_type): request[key] = val else: request[key] = simplejson.dumps(val) query_state = { 'had_error_retry': False, 'request': request, 'failures': 0, } # type: Dict[str, Any] def error_retry(error_string): # type: (str) -> bool if not self.retry_on_errors or query_state["failures"] >= 10: return False if self.verbose: if not query_state["had_error_retry"]: sys.stdout.write("zulip API(%s): connection error%s -- retrying." % \ (url.split(API_VERSTRING, 2)[0], error_string,)) query_state["had_error_retry"] = True else: sys.stdout.write(".") sys.stdout.flush() query_state["request"]["dont_block"] = simplejson.dumps(True) time.sleep(1) query_state["failures"] += 1 return True def end_error_retry(succeeded): # type: (bool) -> None if query_state["had_error_retry"] and self.verbose: if succeeded: print("Success!") else: print("Failed!") while True: try: if method == "GET": kwarg = "params" else: kwarg = "data" kwargs = {kwarg: query_state["request"]} # Build a client cert object for requests if self.client_cert_key is not None: client_cert = (self.client_cert, self.client_cert_key) # type: Union[str, Tuple[str, str]] else: client_cert = self.client_cert res = requests.request( method, urllib.parse.urljoin(self.base_url, url), auth=requests.auth.HTTPBasicAuth(self.email, self.api_key), verify=self.tls_verification, cert=client_cert, timeout=90, headers={"User-agent": self.get_user_agent()}, **kwargs) # On 50x errors, try again after a short sleep if str(res.status_code).startswith('5'): if error_retry(" (server %s)" % (res.status_code,)): continue # Otherwise fall through and process the python-requests error normally except (requests.exceptions.Timeout, requests.exceptions.SSLError) as e: # Timeouts are either a Timeout or an SSLError; we # want the later exception handlers to deal with any # non-timeout other SSLErrors if (isinstance(e, requests.exceptions.SSLError) and str(e) != "The read operation timed out"): raise if longpolling: # When longpolling, we expect the timeout to fire, # and the correct response is to just retry continue else: end_error_retry(False) return {'msg': "Connection error:\n%s" % traceback.format_exc(), "result": "connection-error"} except requests.exceptions.ConnectionError: if error_retry(""): continue end_error_retry(False) return {'msg': "Connection error:\n%s" % traceback.format_exc(), "result": "connection-error"} except Exception: # We'll split this out into more cases as we encounter new bugs. return {'msg': "Unexpected error:\n%s" % traceback.format_exc(), "result": "unexpected-error"} try: if requests_json_is_function: json_result = res.json() else: json_result = res.json except Exception: json_result = None if json_result is not None: end_error_retry(True) return json_result end_error_retry(False) return {'msg': "Unexpected error from the server", "result": "http-error", "status_code": res.status_code} @classmethod def _register(cls, name, url=None, make_request=None, method="POST", computed_url=None, **query_kwargs): # type: (Any, str, Optional[Callable], str, Optional[Callable], **Any) -> Any if url is None: url = name if make_request is None: def make_request(**kwargs): # type: (**Any) -> Any return kwargs.get("request", {}) def call(self, *args, **kwargs): # type: (*Any, **Any) -> str request = make_request(*args, **kwargs) if computed_url is not None: req_url = computed_url(request) else: req_url = url return self.do_api_query(request, API_VERSTRING + req_url, method=method, **query_kwargs) call.__name__ = name setattr(cls, name, call) def call_on_each_event(self, callback, event_types=None, narrow=None): # type: (Callable, Optional[List[str]], Any) -> None if narrow is None: narrow = [] def do_register(): # type: () -> Tuple[str, int] while True: if event_types is None: res = self.register() # type: ignore else: res = self.register(event_types=event_types, narrow=narrow) # type: ignore if 'error' in res.get('result'): if self.verbose: print("Server returned error:\n%s" % res['msg']) time.sleep(1) else: return (res['queue_id'], res['last_event_id']) queue_id = None while True: if queue_id is None: (queue_id, last_event_id) = do_register() res = self.get_events(queue_id=queue_id, last_event_id=last_event_id) # type: ignore if 'error' in res.get('result'): if res["result"] == "http-error": if self.verbose: print("HTTP error fetching events -- probably a server restart") elif res["result"] == "connection-error": if self.verbose: print("Connection error fetching events -- probably server is temporarily down?") else: if self.verbose: print("Server returned error:\n%s" % res["msg"]) if res["msg"].startswith("Bad event queue id:"): # Our event queue went away, probably because # we were asleep or the server restarted # abnormally. We may have missed some # events while the network was down or # something, but there's not really anything # we can do about it other than resuming # getting new ones. # # Reset queue_id to register a new event queue. queue_id = None # TODO: Make this back off once it's more reliable time.sleep(1) continue for event in res['events']: last_event_id = max(last_event_id, int(event['id'])) callback(event) def call_on_each_message(self, callback): # type: (Callable) -> None def event_callback(event): # type: (Dict[str, str]) -> None if event['type'] == 'message': callback(event['message']) self.call_on_each_event(event_callback, ['message']) def _mk_subs(streams, **kwargs): # type: (str, **Any ) -> Dict[str, str] result = kwargs result['subscriptions'] = streams return result def _mk_rm_subs(streams): # type: (str) -> Dict[str, str] return {'delete': streams} def _mk_deregister(queue_id): # type: (str) -> Dict[str, str] return {'queue_id': queue_id} def _mk_events(event_types=None, narrow=None): # type: (Any, List[None]) -> Dict[Any, List[None]] if event_types is None: return dict() if narrow is None: narrow = [] return dict(event_types=event_types, narrow=narrow) def _kwargs_to_dict(**kwargs): # type: (**Any) -> Any return kwargs class ZulipStream(object): """ A Zulip stream-like object """ def __init__(self, type, to, subject, **kwargs): # type: (str, str, str, **Any) -> None self.client = Client(**kwargs) self.type = type self.to = to self.subject = subject def write(self, content): # type: (str) -> None message = {"type": self.type, "to": self.to, "subject": self.subject, "content": content} self.client.send_message(message) # type: ignore def flush(self): # type: () -> None pass Client._register('send_message', url='messages', make_request=(lambda request: request)) Client._register('update_message', method='PATCH', url='messages', make_request=(lambda request: request)) Client._register('get_messages', method='GET', url='messages/latest', longpolling=True) Client._register('get_events', url='events', method='GET', longpolling=True, make_request=(lambda **kwargs: kwargs)) Client._register('register', make_request=_mk_events) Client._register('export', method='GET', url='export') Client._register('deregister', url="events", method="DELETE", make_request=_mk_deregister) Client._register('get_profile', method='GET', url='users/me') Client._register('get_streams', method='GET', url='streams', make_request=_kwargs_to_dict) Client._register('get_members', method='GET', url='users') Client._register('list_subscriptions', method='GET', url='users/me/subscriptions') Client._register('add_subscriptions', url='users/me/subscriptions', make_request=_mk_subs) Client._register('remove_subscriptions', method='PATCH', url='users/me/subscriptions', make_request=_mk_rm_subs) Client._register('get_subscribers', method='GET', computed_url=lambda request: 'streams/%s/members' % (urllib.parse.quote(request['stream'], safe=''),), make_request=_kwargs_to_dict) Client._register('render_message', method='GET', url='messages/render') Client._register('create_user', method='POST', url='users')