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#!/usr/bin/env python
#
# Copyright 2009 Facebook
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Implementations of various third-party authentication schemes.
All the classes in this file are class Mixins designed to be used with
web.py RequestHandler classes. The primary methods for each service are
authenticate_redirect(), authorize_redirect(), and get_authenticated_user().
The former should be called to redirect the user to, e.g., the OpenID
authentication page on the third party service, and the latter should
be called upon return to get the user data from the data returned by
the third party service.
They all take slightly different arguments due to the fact all these
services implement authentication and authorization slightly differently.
See the individual service classes below for complete documentation.
Example usage for Google OpenID::
class GoogleHandler(tornado.web.RequestHandler, tornado.auth.GoogleMixin):
@tornado.web.asynchronous
def get(self):
if self.get_argument("openid.mode", None):
self.get_authenticated_user(self.async_callback(self._on_auth))
return
self.authenticate_redirect()
def _on_auth(self, user):
if not user:
raise tornado.web.HTTPError(500, "Google auth failed")
# Save the user with, e.g., set_secure_cookie()
"""
from __future__ import absolute_import, division, with_statement
import base64
import binascii
import hashlib
import hmac
import time
import urllib
import urlparse
import uuid
from tornado import httpclient
from tornado import escape
from tornado.httputil import url_concat
from tornado.log import gen_log
from tornado.util import bytes_type, b
class OpenIdMixin(object):
"""Abstract implementation of OpenID and Attribute Exchange.
See GoogleMixin below for example implementations.
"""
def authenticate_redirect(self, callback_uri=None,
ax_attrs=["name", "email", "language", "username"]):
"""Returns the authentication URL for this service.
After authentication, the service will redirect back to the given
callback URI.
We request the given attributes for the authenticated user by
default (name, email, language, and username). If you don't need
all those attributes for your app, you can request fewer with
the ax_attrs keyword argument.
"""
callback_uri = callback_uri or self.request.uri
args = self._openid_args(callback_uri, ax_attrs=ax_attrs)
self.redirect(self._OPENID_ENDPOINT + "?" + urllib.urlencode(args))
def get_authenticated_user(self, callback, http_client=None):
"""Fetches the authenticated user data upon redirect.
This method should be called by the handler that receives the
redirect from the authenticate_redirect() or authorize_redirect()
methods.
"""
# Verify the OpenID response via direct request to the OP
args = dict((k, v[-1]) for k, v in self.request.arguments.iteritems())
args["openid.mode"] = u"check_authentication"
url = self._OPENID_ENDPOINT
if http_client is None:
http_client = httpclient.AsyncHTTPClient()
http_client.fetch(url, self.async_callback(
self._on_authentication_verified, callback),
method="POST", body=urllib.urlencode(args))
def _openid_args(self, callback_uri, ax_attrs=[], oauth_scope=None):
url = urlparse.urljoin(self.request.full_url(), callback_uri)
args = {
"openid.ns": "http://specs.openid.net/auth/2.0",
"openid.claimed_id":
"http://specs.openid.net/auth/2.0/identifier_select",
"openid.identity":
"http://specs.openid.net/auth/2.0/identifier_select",
"openid.return_to": url,
"openid.realm": urlparse.urljoin(url, '/'),
"openid.mode": "checkid_setup",
}
if ax_attrs:
args.update({
"openid.ns.ax": "http://openid.net/srv/ax/1.0",
"openid.ax.mode": "fetch_request",
})
ax_attrs = set(ax_attrs)
required = []
if "name" in ax_attrs:
ax_attrs -= set(["name", "firstname", "fullname", "lastname"])
required += ["firstname", "fullname", "lastname"]
args.update({
"openid.ax.type.firstname":
"http://axschema.org/namePerson/first",
"openid.ax.type.fullname":
"http://axschema.org/namePerson",
"openid.ax.type.lastname":
"http://axschema.org/namePerson/last",
})
known_attrs = {
"email": "http://axschema.org/contact/email",
"language": "http://axschema.org/pref/language",
"username": "http://axschema.org/namePerson/friendly",
}
for name in ax_attrs:
args["openid.ax.type." + name] = known_attrs[name]
required.append(name)
args["openid.ax.required"] = ",".join(required)
if oauth_scope:
args.update({
"openid.ns.oauth":
"http://specs.openid.net/extensions/oauth/1.0",
"openid.oauth.consumer": self.request.host.split(":")[0],
"openid.oauth.scope": oauth_scope,
})
return args
def _on_authentication_verified(self, callback, response):
if response.error or b("is_valid:true") not in response.body:
gen_log.warning("Invalid OpenID response: %s", response.error or
response.body)
callback(None)
return
# Make sure we got back at least an email from attribute exchange
ax_ns = None
for name in self.request.arguments.iterkeys():
if name.startswith("openid.ns.") and \
self.get_argument(name) == u"http://openid.net/srv/ax/1.0":
ax_ns = name[10:]
break
def get_ax_arg(uri):
if not ax_ns:
return u""
prefix = "openid." + ax_ns + ".type."
ax_name = None
for name in self.request.arguments.iterkeys():
if self.get_argument(name) == uri and name.startswith(prefix):
part = name[len(prefix):]
ax_name = "openid." + ax_ns + ".value." + part
break
if not ax_name:
return u""
return self.get_argument(ax_name, u"")
email = get_ax_arg("http://axschema.org/contact/email")
name = get_ax_arg("http://axschema.org/namePerson")
first_name = get_ax_arg("http://axschema.org/namePerson/first")
last_name = get_ax_arg("http://axschema.org/namePerson/last")
username = get_ax_arg("http://axschema.org/namePerson/friendly")
locale = get_ax_arg("http://axschema.org/pref/language").lower()
user = dict()
name_parts = []
if first_name:
user["first_name"] = first_name
name_parts.append(first_name)
if last_name:
user["last_name"] = last_name
name_parts.append(last_name)
if name:
user["name"] = name
elif name_parts:
user["name"] = u" ".join(name_parts)
elif email:
user["name"] = email.split("@")[0]
if email:
user["email"] = email
if locale:
user["locale"] = locale
if username:
user["username"] = username
claimed_id = self.get_argument("openid.claimed_id", None)
if claimed_id:
user["claimed_id"] = claimed_id
callback(user)
class OAuthMixin(object):
"""Abstract implementation of OAuth.
See TwitterMixin and FriendFeedMixin below for example implementations.
"""
def authorize_redirect(self, callback_uri=None, extra_params=None,
http_client=None):
"""Redirects the user to obtain OAuth authorization for this service.
Twitter and FriendFeed both require that you register a Callback
URL with your application. You should call this method to log the
user in, and then call get_authenticated_user() in the handler
you registered as your Callback URL to complete the authorization
process.
This method sets a cookie called _oauth_request_token which is
subsequently used (and cleared) in get_authenticated_user for
security purposes.
"""
if callback_uri and getattr(self, "_OAUTH_NO_CALLBACKS", False):
raise Exception("This service does not support oauth_callback")
if http_client is None:
http_client = httpclient.AsyncHTTPClient()
if getattr(self, "_OAUTH_VERSION", "1.0a") == "1.0a":
http_client.fetch(
self._oauth_request_token_url(callback_uri=callback_uri,
extra_params=extra_params),
self.async_callback(
self._on_request_token,
self._OAUTH_AUTHORIZE_URL,
callback_uri))
else:
http_client.fetch(
self._oauth_request_token_url(),
self.async_callback(
self._on_request_token, self._OAUTH_AUTHORIZE_URL,
callback_uri))
def get_authenticated_user(self, callback, http_client=None):
"""Gets the OAuth authorized user and access token on callback.
This method should be called from the handler for your registered
OAuth Callback URL to complete the registration process. We call
callback with the authenticated user, which in addition to standard
attributes like 'name' includes the 'access_key' attribute, which
contains the OAuth access you can use to make authorized requests
to this service on behalf of the user.
"""
request_key = escape.utf8(self.get_argument("oauth_token"))
oauth_verifier = self.get_argument("oauth_verifier", None)
request_cookie = self.get_cookie("_oauth_request_token")
if not request_cookie:
gen_log.warning("Missing OAuth request token cookie")
callback(None)
return
self.clear_cookie("_oauth_request_token")
cookie_key, cookie_secret = [base64.b64decode(escape.utf8(i)) for i in request_cookie.split("|")]
if cookie_key != request_key:
gen_log.info((cookie_key, request_key, request_cookie))
gen_log.warning("Request token does not match cookie")
callback(None)
return
token = dict(key=cookie_key, secret=cookie_secret)
if oauth_verifier:
token["verifier"] = oauth_verifier
if http_client is None:
http_client = httpclient.AsyncHTTPClient()
http_client.fetch(self._oauth_access_token_url(token),
self.async_callback(self._on_access_token, callback))
def _oauth_request_token_url(self, callback_uri=None, extra_params=None):
consumer_token = self._oauth_consumer_token()
url = self._OAUTH_REQUEST_TOKEN_URL
args = dict(
oauth_consumer_key=escape.to_basestring(consumer_token["key"]),
oauth_signature_method="HMAC-SHA1",
oauth_timestamp=str(int(time.time())),
oauth_nonce=escape.to_basestring(binascii.b2a_hex(uuid.uuid4().bytes)),
oauth_version=getattr(self, "_OAUTH_VERSION", "1.0a"),
)
if getattr(self, "_OAUTH_VERSION", "1.0a") == "1.0a":
if callback_uri == "oob":
args["oauth_callback"] = "oob"
elif callback_uri:
args["oauth_callback"] = urlparse.urljoin(
self.request.full_url(), callback_uri)
if extra_params:
args.update(extra_params)
signature = _oauth10a_signature(consumer_token, "GET", url, args)
else:
signature = _oauth_signature(consumer_token, "GET", url, args)
args["oauth_signature"] = signature
return url + "?" + urllib.urlencode(args)
def _on_request_token(self, authorize_url, callback_uri, response):
if response.error:
raise Exception("Could not get request token")
request_token = _oauth_parse_response(response.body)
data = (base64.b64encode(request_token["key"]) + b("|") +
base64.b64encode(request_token["secret"]))
self.set_cookie("_oauth_request_token", data)
args = dict(oauth_token=request_token["key"])
if callback_uri == "oob":
self.finish(authorize_url + "?" + urllib.urlencode(args))
return
elif callback_uri:
args["oauth_callback"] = urlparse.urljoin(
self.request.full_url(), callback_uri)
self.redirect(authorize_url + "?" + urllib.urlencode(args))
def _oauth_access_token_url(self, request_token):
consumer_token = self._oauth_consumer_token()
url = self._OAUTH_ACCESS_TOKEN_URL
args = dict(
oauth_consumer_key=escape.to_basestring(consumer_token["key"]),
oauth_token=escape.to_basestring(request_token["key"]),
oauth_signature_method="HMAC-SHA1",
oauth_timestamp=str(int(time.time())),
oauth_nonce=escape.to_basestring(binascii.b2a_hex(uuid.uuid4().bytes)),
oauth_version=getattr(self, "_OAUTH_VERSION", "1.0a"),
)
if "verifier" in request_token:
args["oauth_verifier"] = request_token["verifier"]
if getattr(self, "_OAUTH_VERSION", "1.0a") == "1.0a":
signature = _oauth10a_signature(consumer_token, "GET", url, args,
request_token)
else:
signature = _oauth_signature(consumer_token, "GET", url, args,
request_token)
args["oauth_signature"] = signature
return url + "?" + urllib.urlencode(args)
def _on_access_token(self, callback, response):
if response.error:
gen_log.warning("Could not fetch access token")
callback(None)
return
access_token = _oauth_parse_response(response.body)
self._oauth_get_user(access_token, self.async_callback(
self._on_oauth_get_user, access_token, callback))
def _oauth_get_user(self, access_token, callback):
raise NotImplementedError()
def _on_oauth_get_user(self, access_token, callback, user):
if not user:
callback(None)
return
user["access_token"] = access_token
callback(user)
def _oauth_request_parameters(self, url, access_token, parameters={},
method="GET"):
"""Returns the OAuth parameters as a dict for the given request.
parameters should include all POST arguments and query string arguments
that will be sent with the request.
"""
consumer_token = self._oauth_consumer_token()
base_args = dict(
oauth_consumer_key=escape.to_basestring(consumer_token["key"]),
oauth_token=escape.to_basestring(access_token["key"]),
oauth_signature_method="HMAC-SHA1",
oauth_timestamp=str(int(time.time())),
oauth_nonce=escape.to_basestring(binascii.b2a_hex(uuid.uuid4().bytes)),
oauth_version=getattr(self, "_OAUTH_VERSION", "1.0a"),
)
args = {}
args.update(base_args)
args.update(parameters)
if getattr(self, "_OAUTH_VERSION", "1.0a") == "1.0a":
signature = _oauth10a_signature(consumer_token, method, url, args,
access_token)
else:
signature = _oauth_signature(consumer_token, method, url, args,
access_token)
base_args["oauth_signature"] = signature
return base_args
class OAuth2Mixin(object):
"""Abstract implementation of OAuth v 2."""
def authorize_redirect(self, redirect_uri=None, client_id=None,
client_secret=None, extra_params=None):
"""Redirects the user to obtain OAuth authorization for this service.
Some providers require that you register a Callback
URL with your application. You should call this method to log the
user in, and then call get_authenticated_user() in the handler
you registered as your Callback URL to complete the authorization
process.
"""
args = {
"redirect_uri": redirect_uri,
"client_id": client_id
}
if extra_params:
args.update(extra_params)
self.redirect(
url_concat(self._OAUTH_AUTHORIZE_URL, args))
def _oauth_request_token_url(self, redirect_uri=None, client_id=None,
client_secret=None, code=None,
extra_params=None):
url = self._OAUTH_ACCESS_TOKEN_URL
args = dict(
redirect_uri=redirect_uri,
code=code,
client_id=client_id,
client_secret=client_secret,
)
if extra_params:
args.update(extra_params)
return url_concat(url, args)
class TwitterMixin(OAuthMixin):
"""Twitter OAuth authentication.
To authenticate with Twitter, register your application with
Twitter at http://twitter.com/apps. Then copy your Consumer Key and
Consumer Secret to the application settings 'twitter_consumer_key' and
'twitter_consumer_secret'. Use this Mixin on the handler for the URL
you registered as your application's Callback URL.
When your application is set up, you can use this Mixin like this
to authenticate the user with Twitter and get access to their stream::
class TwitterHandler(tornado.web.RequestHandler,
tornado.auth.TwitterMixin):
@tornado.web.asynchronous
def get(self):
if self.get_argument("oauth_token", None):
self.get_authenticated_user(self.async_callback(self._on_auth))
return
self.authorize_redirect()
def _on_auth(self, user):
if not user:
raise tornado.web.HTTPError(500, "Twitter auth failed")
# Save the user using, e.g., set_secure_cookie()
The user object returned by get_authenticated_user() includes the
attributes 'username', 'name', and all of the custom Twitter user
attributes describe at
http://apiwiki.twitter.com/Twitter-REST-API-Method%3A-users%C2%A0show
in addition to 'access_token'. You should save the access token with
the user; it is required to make requests on behalf of the user later
with twitter_request().
"""
_OAUTH_REQUEST_TOKEN_URL = "http://api.twitter.com/oauth/request_token"
_OAUTH_ACCESS_TOKEN_URL = "http://api.twitter.com/oauth/access_token"
_OAUTH_AUTHORIZE_URL = "http://api.twitter.com/oauth/authorize"
_OAUTH_AUTHENTICATE_URL = "http://api.twitter.com/oauth/authenticate"
_OAUTH_NO_CALLBACKS = False
def authenticate_redirect(self, callback_uri=None):
"""Just like authorize_redirect(), but auto-redirects if authorized.
This is generally the right interface to use if you are using
Twitter for single-sign on.
"""
http = httpclient.AsyncHTTPClient()
http.fetch(self._oauth_request_token_url(callback_uri=callback_uri), self.async_callback(
self._on_request_token, self._OAUTH_AUTHENTICATE_URL, None))
def twitter_request(self, path, callback, access_token=None,
post_args=None, **args):
"""Fetches the given API path, e.g., "/statuses/user_timeline/btaylor"
The path should not include the format (we automatically append
".json" and parse the JSON output).
If the request is a POST, post_args should be provided. Query
string arguments should be given as keyword arguments.
All the Twitter methods are documented at
http://apiwiki.twitter.com/Twitter-API-Documentation.
Many methods require an OAuth access token which you can obtain
through authorize_redirect() and get_authenticated_user(). The
user returned through that process includes an 'access_token'
attribute that can be used to make authenticated requests via
this method. Example usage::
class MainHandler(tornado.web.RequestHandler,
tornado.auth.TwitterMixin):
@tornado.web.authenticated
@tornado.web.asynchronous
def get(self):
self.twitter_request(
"/statuses/update",
post_args={"status": "Testing Tornado Web Server"},
access_token=user["access_token"],
callback=self.async_callback(self._on_post))
def _on_post(self, new_entry):
if not new_entry:
# Call failed; perhaps missing permission?
self.authorize_redirect()
return
self.finish("Posted a message!")
"""
if path.startswith('http:') or path.startswith('https:'):
# Raw urls are useful for e.g. search which doesn't follow the
# usual pattern: http://search.twitter.com/search.json
url = path
else:
url = "http://api.twitter.com/1" + path + ".json"
# Add the OAuth resource request signature if we have credentials
if access_token:
all_args = {}
all_args.update(args)
all_args.update(post_args or {})
method = "POST" if post_args is not None else "GET"
oauth = self._oauth_request_parameters(
url, access_token, all_args, method=method)
args.update(oauth)
if args:
url += "?" + urllib.urlencode(args)
callback = self.async_callback(self._on_twitter_request, callback)
http = httpclient.AsyncHTTPClient()
if post_args is not None:
http.fetch(url, method="POST", body=urllib.urlencode(post_args),
callback=callback)
else:
http.fetch(url, callback=callback)
def _on_twitter_request(self, callback, response):
if response.error:
gen_log.warning("Error response %s fetching %s", response.error,
response.request.url)
callback(None)
return
callback(escape.json_decode(response.body))
def _oauth_consumer_token(self):
self.require_setting("twitter_consumer_key", "Twitter OAuth")
self.require_setting("twitter_consumer_secret", "Twitter OAuth")
return dict(
key=self.settings["twitter_consumer_key"],
secret=self.settings["twitter_consumer_secret"])
def _oauth_get_user(self, access_token, callback):
callback = self.async_callback(self._parse_user_response, callback)
self.twitter_request(
"/users/show/" + access_token["screen_name"],
access_token=access_token, callback=callback)
def _parse_user_response(self, callback, user):
if user:
user["username"] = user["screen_name"]
callback(user)
class FriendFeedMixin(OAuthMixin):
"""FriendFeed OAuth authentication.
To authenticate with FriendFeed, register your application with
FriendFeed at http://friendfeed.com/api/applications. Then
copy your Consumer Key and Consumer Secret to the application settings
'friendfeed_consumer_key' and 'friendfeed_consumer_secret'. Use
this Mixin on the handler for the URL you registered as your
application's Callback URL.
When your application is set up, you can use this Mixin like this
to authenticate the user with FriendFeed and get access to their feed::
class FriendFeedHandler(tornado.web.RequestHandler,
tornado.auth.FriendFeedMixin):
@tornado.web.asynchronous
def get(self):
if self.get_argument("oauth_token", None):
self.get_authenticated_user(self.async_callback(self._on_auth))
return
self.authorize_redirect()
def _on_auth(self, user):
if not user:
raise tornado.web.HTTPError(500, "FriendFeed auth failed")
# Save the user using, e.g., set_secure_cookie()
The user object returned by get_authenticated_user() includes the
attributes 'username', 'name', and 'description' in addition to
'access_token'. You should save the access token with the user;
it is required to make requests on behalf of the user later with
friendfeed_request().
"""
_OAUTH_VERSION = "1.0"
_OAUTH_REQUEST_TOKEN_URL = "https://friendfeed.com/account/oauth/request_token"
_OAUTH_ACCESS_TOKEN_URL = "https://friendfeed.com/account/oauth/access_token"
_OAUTH_AUTHORIZE_URL = "https://friendfeed.com/account/oauth/authorize"
_OAUTH_NO_CALLBACKS = True
_OAUTH_VERSION = "1.0"
def friendfeed_request(self, path, callback, access_token=None,
post_args=None, **args):
"""Fetches the given relative API path, e.g., "/bret/friends"
If the request is a POST, post_args should be provided. Query
string arguments should be given as keyword arguments.
All the FriendFeed methods are documented at
http://friendfeed.com/api/documentation.
Many methods require an OAuth access token which you can obtain
through authorize_redirect() and get_authenticated_user(). The
user returned through that process includes an 'access_token'
attribute that can be used to make authenticated requests via
this method. Example usage::
class MainHandler(tornado.web.RequestHandler,
tornado.auth.FriendFeedMixin):
@tornado.web.authenticated
@tornado.web.asynchronous
def get(self):
self.friendfeed_request(
"/entry",
post_args={"body": "Testing Tornado Web Server"},
access_token=self.current_user["access_token"],
callback=self.async_callback(self._on_post))
def _on_post(self, new_entry):
if not new_entry:
# Call failed; perhaps missing permission?
self.authorize_redirect()
return
self.finish("Posted a message!")
"""
# Add the OAuth resource request signature if we have credentials
url = "http://friendfeed-api.com/v2" + path
if access_token:
all_args = {}
all_args.update(args)
all_args.update(post_args or {})
method = "POST" if post_args is not None else "GET"
oauth = self._oauth_request_parameters(
url, access_token, all_args, method=method)
args.update(oauth)
if args:
url += "?" + urllib.urlencode(args)
callback = self.async_callback(self._on_friendfeed_request, callback)
http = httpclient.AsyncHTTPClient()
if post_args is not None:
http.fetch(url, method="POST", body=urllib.urlencode(post_args),
callback=callback)
else:
http.fetch(url, callback=callback)
def _on_friendfeed_request(self, callback, response):
if response.error:
gen_log.warning("Error response %s fetching %s", response.error,
response.request.url)
callback(None)
return
callback(escape.json_decode(response.body))
def _oauth_consumer_token(self):
self.require_setting("friendfeed_consumer_key", "FriendFeed OAuth")
self.require_setting("friendfeed_consumer_secret", "FriendFeed OAuth")
return dict(
key=self.settings["friendfeed_consumer_key"],
secret=self.settings["friendfeed_consumer_secret"])
def _oauth_get_user(self, access_token, callback):
callback = self.async_callback(self._parse_user_response, callback)
self.friendfeed_request(
"/feedinfo/" + access_token["username"],
include="id,name,description", access_token=access_token,
callback=callback)
def _parse_user_response(self, callback, user):
if user:
user["username"] = user["id"]
callback(user)
class GoogleMixin(OpenIdMixin, OAuthMixin):
"""Google Open ID / OAuth authentication.
No application registration is necessary to use Google for authentication
or to access Google resources on behalf of a user. To authenticate with
Google, redirect with authenticate_redirect(). On return, parse the
response with get_authenticated_user(). We send a dict containing the
values for the user, including 'email', 'name', and 'locale'.
Example usage::
class GoogleHandler(tornado.web.RequestHandler, tornado.auth.GoogleMixin):
@tornado.web.asynchronous
def get(self):
if self.get_argument("openid.mode", None):
self.get_authenticated_user(self.async_callback(self._on_auth))
return
self.authenticate_redirect()
def _on_auth(self, user):
if not user:
raise tornado.web.HTTPError(500, "Google auth failed")
# Save the user with, e.g., set_secure_cookie()
"""
_OPENID_ENDPOINT = "https://www.google.com/accounts/o8/ud"
_OAUTH_ACCESS_TOKEN_URL = "https://www.google.com/accounts/OAuthGetAccessToken"
def authorize_redirect(self, oauth_scope, callback_uri=None,
ax_attrs=["name", "email", "language", "username"]):
"""Authenticates and authorizes for the given Google resource.
Some of the available resources are:
* Gmail Contacts - http://www.google.com/m8/feeds/
* Calendar - http://www.google.com/calendar/feeds/
* Finance - http://finance.google.com/finance/feeds/
You can authorize multiple resources by separating the resource
URLs with a space.
"""
callback_uri = callback_uri or self.request.uri
args = self._openid_args(callback_uri, ax_attrs=ax_attrs,
oauth_scope=oauth_scope)
self.redirect(self._OPENID_ENDPOINT + "?" + urllib.urlencode(args))
def get_authenticated_user(self, callback):
"""Fetches the authenticated user data upon redirect."""
# Look to see if we are doing combined OpenID/OAuth
oauth_ns = ""
for name, values in self.request.arguments.iteritems():
if name.startswith("openid.ns.") and \
values[-1] == u"http://specs.openid.net/extensions/oauth/1.0":
oauth_ns = name[10:]
break
token = self.get_argument("openid." + oauth_ns + ".request_token", "")
if token:
http = httpclient.AsyncHTTPClient()
token = dict(key=token, secret="")
http.fetch(self._oauth_access_token_url(token),
self.async_callback(self._on_access_token, callback))
else:
OpenIdMixin.get_authenticated_user(self, callback)
def _oauth_consumer_token(self):
self.require_setting("google_consumer_key", "Google OAuth")
self.require_setting("google_consumer_secret", "Google OAuth")
return dict(
key=self.settings["google_consumer_key"],
secret=self.settings["google_consumer_secret"])
def _oauth_get_user(self, access_token, callback):
OpenIdMixin.get_authenticated_user(self, callback)
class FacebookMixin(object):
"""Facebook Connect authentication.
New applications should consider using `FacebookGraphMixin` below instead
of this class.
To authenticate with Facebook, register your application with
Facebook at http://www.facebook.com/developers/apps.php. Then
copy your API Key and Application Secret to the application settings
'facebook_api_key' and 'facebook_secret'.
When your application is set up, you can use this Mixin like this
to authenticate the user with Facebook::
class FacebookHandler(tornado.web.RequestHandler,
tornado.auth.FacebookMixin):
@tornado.web.asynchronous
def get(self):
if self.get_argument("session", None):
self.get_authenticated_user(self.async_callback(self._on_auth))
return
self.authenticate_redirect()
def _on_auth(self, user):
if not user:
raise tornado.web.HTTPError(500, "Facebook auth failed")
# Save the user using, e.g., set_secure_cookie()
The user object returned by get_authenticated_user() includes the
attributes 'facebook_uid' and 'name' in addition to session attributes
like 'session_key'. You should save the session key with the user; it is
required to make requests on behalf of the user later with
facebook_request().
"""
def authenticate_redirect(self, callback_uri=None, cancel_uri=None,
extended_permissions=None):
"""Authenticates/installs this app for the current user."""
self.require_setting("facebook_api_key", "Facebook Connect")
callback_uri = callback_uri or self.request.uri
args = {
"api_key": self.settings["facebook_api_key"],
"v": "1.0",
"fbconnect": "true",
"display": "page",
"next": urlparse.urljoin(self.request.full_url(), callback_uri),
"return_session": "true",
}
if cancel_uri:
args["cancel_url"] = urlparse.urljoin(
self.request.full_url(), cancel_uri)
if extended_permissions:
if isinstance(extended_permissions, (unicode, bytes_type)):
extended_permissions = [extended_permissions]
args["req_perms"] = ",".join(extended_permissions)
self.redirect("http://www.facebook.com/login.php?" +
urllib.urlencode(args))
def authorize_redirect(self, extended_permissions, callback_uri=None,
cancel_uri=None):
"""Redirects to an authorization request for the given FB resource.
The available resource names are listed at
http://wiki.developers.facebook.com/index.php/Extended_permission.
The most common resource types include:
* publish_stream
* read_stream
* email
* sms
extended_permissions can be a single permission name or a list of
names. To get the session secret and session key, call
get_authenticated_user() just as you would with
authenticate_redirect().
"""
self.authenticate_redirect(callback_uri, cancel_uri,
extended_permissions)
def get_authenticated_user(self, callback):
"""Fetches the authenticated Facebook user.
The authenticated user includes the special Facebook attributes
'session_key' and 'facebook_uid' in addition to the standard
user attributes like 'name'.
"""
self.require_setting("facebook_api_key", "Facebook Connect")
session = escape.json_decode(self.get_argument("session"))
self.facebook_request(
method="facebook.users.getInfo",
callback=self.async_callback(
self._on_get_user_info, callback, session),
session_key=session["session_key"],
uids=session["uid"],
fields="uid,first_name,last_name,name,locale,pic_square,"
"profile_url,username")
def facebook_request(self, method, callback, **args):
"""Makes a Facebook API REST request.
We automatically include the Facebook API key and signature, but
it is the callers responsibility to include 'session_key' and any
other required arguments to the method.
The available Facebook methods are documented here:
http://wiki.developers.facebook.com/index.php/API
Here is an example for the stream.get() method::
class MainHandler(tornado.web.RequestHandler,
tornado.auth.FacebookMixin):
@tornado.web.authenticated
@tornado.web.asynchronous
def get(self):
self.facebook_request(
method="stream.get",
callback=self.async_callback(self._on_stream),
session_key=self.current_user["session_key"])
def _on_stream(self, stream):
if stream is None:
# Not authorized to read the stream yet?
self.redirect(self.authorize_redirect("read_stream"))
return
self.render("stream.html", stream=stream)
"""
self.require_setting("facebook_api_key", "Facebook Connect")
self.require_setting("facebook_secret", "Facebook Connect")
if not method.startswith("facebook."):
method = "facebook." + method
args["api_key"] = self.settings["facebook_api_key"]
args["v"] = "1.0"
args["method"] = method
args["call_id"] = str(long(time.time() * 1e6))
args["format"] = "json"
args["sig"] = self._signature(args)
url = "http://api.facebook.com/restserver.php?" + \
urllib.urlencode(args)
http = httpclient.AsyncHTTPClient()
http.fetch(url, callback=self.async_callback(
self._parse_response, callback))
def _on_get_user_info(self, callback, session, users):
if users is None:
callback(None)
return
callback({
"name": users[0]["name"],
"first_name": users[0]["first_name"],
"last_name": users[0]["last_name"],
"uid": users[0]["uid"],
"locale": users[0]["locale"],
"pic_square": users[0]["pic_square"],
"profile_url": users[0]["profile_url"],
"username": users[0].get("username"),
"session_key": session["session_key"],
"session_expires": session.get("expires"),
})
def _parse_response(self, callback, response):
if response.error:
gen_log.warning("HTTP error from Facebook: %s", response.error)
callback(None)
return
try:
json = escape.json_decode(response.body)
except Exception:
gen_log.warning("Invalid JSON from Facebook: %r", response.body)
callback(None)
return
if isinstance(json, dict) and json.get("error_code"):
gen_log.warning("Facebook error: %d: %r", json["error_code"],
json.get("error_msg"))
callback(None)
return
callback(json)
def _signature(self, args):
parts = ["%s=%s" % (n, args[n]) for n in sorted(args.keys())]
body = "".join(parts) + self.settings["facebook_secret"]
if isinstance(body, unicode):
body = body.encode("utf-8")
return hashlib.md5(body).hexdigest()
class FacebookGraphMixin(OAuth2Mixin):
"""Facebook authentication using the new Graph API and OAuth2."""
_OAUTH_ACCESS_TOKEN_URL = "https://graph.facebook.com/oauth/access_token?"
_OAUTH_AUTHORIZE_URL = "https://graph.facebook.com/oauth/authorize?"
_OAUTH_NO_CALLBACKS = False
def get_authenticated_user(self, redirect_uri, client_id, client_secret,
code, callback, extra_fields=None):
"""Handles the login for the Facebook user, returning a user object.
Example usage::
class FacebookGraphLoginHandler(LoginHandler, tornado.auth.FacebookGraphMixin):
@tornado.web.asynchronous
def get(self):
if self.get_argument("code", False):
self.get_authenticated_user(
redirect_uri='/auth/facebookgraph/',
client_id=self.settings["facebook_api_key"],
client_secret=self.settings["facebook_secret"],
code=self.get_argument("code"),
callback=self.async_callback(
self._on_login))
return
self.authorize_redirect(redirect_uri='/auth/facebookgraph/',
client_id=self.settings["facebook_api_key"],
extra_params={"scope": "read_stream,offline_access"})
def _on_login(self, user):
logging.error(user)
self.finish()
"""
http = httpclient.AsyncHTTPClient()
args = {
"redirect_uri": redirect_uri,
"code": code,
"client_id": client_id,
"client_secret": client_secret,
}
fields = set(['id', 'name', 'first_name', 'last_name',
'locale', 'picture', 'link'])
if extra_fields:
fields.update(extra_fields)
http.fetch(self._oauth_request_token_url(**args),
self.async_callback(self._on_access_token, redirect_uri, client_id,
client_secret, callback, fields))
def _on_access_token(self, redirect_uri, client_id, client_secret,
callback, fields, response):
if response.error:
gen_log.warning('Facebook auth error: %s' % str(response))
callback(None)
return
args = escape.parse_qs_bytes(escape.native_str(response.body))
session = {
"access_token": args["access_token"][-1],
"expires": args.get("expires")
}
self.facebook_request(
path="/me",
callback=self.async_callback(
self._on_get_user_info, callback, session, fields),
access_token=session["access_token"],
fields=",".join(fields)
)
def _on_get_user_info(self, callback, session, fields, user):
if user is None:
callback(None)
return
fieldmap = {}
for field in fields:
fieldmap[field] = user.get(field)
fieldmap.update({"access_token": session["access_token"], "session_expires": session.get("expires")})
callback(fieldmap)
def facebook_request(self, path, callback, access_token=None,
post_args=None, **args):
"""Fetches the given relative API path, e.g., "/btaylor/picture"
If the request is a POST, post_args should be provided. Query
string arguments should be given as keyword arguments.
An introduction to the Facebook Graph API can be found at
http://developers.facebook.com/docs/api
Many methods require an OAuth access token which you can obtain
through authorize_redirect() and get_authenticated_user(). The
user returned through that process includes an 'access_token'
attribute that can be used to make authenticated requests via
this method. Example usage::
class MainHandler(tornado.web.RequestHandler,
tornado.auth.FacebookGraphMixin):
@tornado.web.authenticated
@tornado.web.asynchronous
def get(self):
self.facebook_request(
"/me/feed",
post_args={"message": "I am posting from my Tornado application!"},
access_token=self.current_user["access_token"],
callback=self.async_callback(self._on_post))
def _on_post(self, new_entry):
if not new_entry:
# Call failed; perhaps missing permission?
self.authorize_redirect()
return
self.finish("Posted a message!")
"""
url = "https://graph.facebook.com" + path
all_args = {}
if access_token:
all_args["access_token"] = access_token
all_args.update(args)
if all_args:
url += "?" + urllib.urlencode(all_args)
callback = self.async_callback(self._on_facebook_request, callback)
http = httpclient.AsyncHTTPClient()
if post_args is not None:
http.fetch(url, method="POST", body=urllib.urlencode(post_args),
callback=callback)
else:
http.fetch(url, callback=callback)
def _on_facebook_request(self, callback, response):
if response.error:
gen_log.warning("Error response %s fetching %s", response.error,
response.request.url)
callback(None)
return
callback(escape.json_decode(response.body))
def _oauth_signature(consumer_token, method, url, parameters={}, token=None):
"""Calculates the HMAC-SHA1 OAuth signature for the given request.
See http://oauth.net/core/1.0/#signing_process
"""
parts = urlparse.urlparse(url)
scheme, netloc, path = parts[:3]
normalized_url = scheme.lower() + "://" + netloc.lower() + path
base_elems = []
base_elems.append(method.upper())
base_elems.append(normalized_url)
base_elems.append("&".join("%s=%s" % (k, _oauth_escape(str(v)))
for k, v in sorted(parameters.items())))
base_string = "&".join(_oauth_escape(e) for e in base_elems)
key_elems = [escape.utf8(consumer_token["secret"])]
key_elems.append(escape.utf8(token["secret"] if token else ""))
key = b("&").join(key_elems)
hash = hmac.new(key, escape.utf8(base_string), hashlib.sha1)
return binascii.b2a_base64(hash.digest())[:-1]
def _oauth10a_signature(consumer_token, method, url, parameters={}, token=None):
"""Calculates the HMAC-SHA1 OAuth 1.0a signature for the given request.
See http://oauth.net/core/1.0a/#signing_process
"""
parts = urlparse.urlparse(url)
scheme, netloc, path = parts[:3]
normalized_url = scheme.lower() + "://" + netloc.lower() + path
base_elems = []
base_elems.append(method.upper())
base_elems.append(normalized_url)
base_elems.append("&".join("%s=%s" % (k, _oauth_escape(str(v)))
for k, v in sorted(parameters.items())))
base_string = "&".join(_oauth_escape(e) for e in base_elems)
key_elems = [escape.utf8(urllib.quote(consumer_token["secret"], safe='~'))]
key_elems.append(escape.utf8(urllib.quote(token["secret"], safe='~') if token else ""))
key = b("&").join(key_elems)
hash = hmac.new(key, escape.utf8(base_string), hashlib.sha1)
return binascii.b2a_base64(hash.digest())[:-1]
def _oauth_escape(val):
if isinstance(val, unicode):
val = val.encode("utf-8")
return urllib.quote(val, safe="~")
def _oauth_parse_response(body):
p = escape.parse_qs(body, keep_blank_values=False)
token = dict(key=p[b("oauth_token")][0], secret=p[b("oauth_token_secret")][0])
# Add the extra parameters the Provider included to the token
special = (b("oauth_token"), b("oauth_token_secret"))
token.update((k, p[k][0]) for k in p if k not in special)
return token
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