我正在尝试使用此处找到的 Facebook 登录来扩展示例 AppEngine 应用程序。我能够让它按原样工作（我自己的访问令牌是从一个单独的文件中添加的），并且当用户登录时它会显示这个漂亮的小页面（由这个example.html提供给你）：
现在，我想访问有关用户朋友的信息；例如，他们喜欢的电影。首先，我在 Facebook 开发人员的仪表板上为我的底层应用程序添加了过多的权限（例如，friends_likes），然后保存了更改。然后我决定尝试显示一个朋友的名字，以及他或她最喜欢的电影。目前，我只是将这些内容显式存储给用户，因此修改了 example.py 文件如下（新行以“###################”结尾):
#!/usr/bin/env python
#
# Copyright 2010 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.
"""
A barebones AppEngine application that uses Facebook for login.
1. Make sure you add a copy of facebook.py (from python-sdk/src/)
into this directory so it can be imported.
2. Don't forget to tick Login With Facebook on your facebook app's
dashboard and place the app's url wherever it is hosted
3. Place a random, unguessable string as a session secret below in
config dict.
4. Fill app id and app secret.
5. Change the application name in app.yaml.
"""
import facebook
import auth
import webapp2
import os
import jinja2
import urllib2
from google.appengine.ext import db
from webapp2_extras import sessions
config = {}
config['webapp2_extras.sessions'] = dict(secret_key=auth.SESSION_SECRET)
class User(db.Model):
id = db.StringProperty(required=True)
created = db.DateTimeProperty(auto_now_add=True)
updated = db.DateTimeProperty(auto_now=True)
name = db.StringProperty(required=True)
profile_url = db.StringProperty(required=True)
access_token = db.StringProperty(required=True)
friend_name = db.StringProperty(required=True) ######################
friend_movies = db.StringProperty(required=True) ####################
class BaseHandler(webapp2.RequestHandler):
"""Provides access to the active Facebook user in self.current_user
The property is lazy-loaded on first access, using the cookie saved
by the Facebook JavaScript SDK to determine the user ID of the active
user. See http://developers.facebook.com/docs/authentication/ for
more information.
"""
@property
def current_user(self):
if self.session.get("user"):
# User is logged in
return self.session.get("user")
else:
# Either used just logged in or just saw the first page
# We'll see here
cookie = facebook.get_user_from_cookie(self.request.cookies,
auth.FACEBOOK_APP_ID,
auth.FACEBOOK_APP_SECRET)
if cookie:
# Okay so user logged in.
# Now, check to see if existing user
user = User.get_by_key_name(cookie["uid"])
if not user:
# Not an existing user so get user info
graph = facebook.GraphAPI(cookie["access_token"])
profile = graph.get_object("me")
friends = graph.get_connections("me", "friends", fields="name")############
fname = friends["data"][0]["name"] ################
fid = friends["data"][0]["id"] ################
fmov = graph.get_connections(fid, "movies", fields="name")##############
user = User(
key_name=str(profile["id"]),
id=str(profile["id"]),
name=profile["name"],
friend_name=str(fname),##############
friend_movies=str(fmov),##############
profile_url=profile["link"],
access_token=cookie["access_token"]
)
user.put()
elif user.access_token != cookie["access_token"]:
user.access_token = cookie["access_token"]
user.put()
# User is now logged in
self.session["user"] = dict(
name=user.name,
friend_name = user.friend_name, #################
friend_movies=user.friend_movies, ###############
profile_url=user.profile_url,
id=user.id,
access_token=user.access_token
)
return self.session.get("user")
return None
def dispatch(self):
"""
This snippet of code is taken from the webapp2 framework documentation.
See more at
http://webapp-improved.appspot.com/api/webapp2_extras/sessions.html
"""
self.session_store = sessions.get_store(request=self.request)
try:
webapp2.RequestHandler.dispatch(self)
finally:
self.session_store.save_sessions(self.response)
@webapp2.cached_property
def session(self):
"""
This snippet of code is taken from the webapp2 framework documentation.
See more at
http://webapp-improved.appspot.com/api/webapp2_extras/sessions.html
"""
return self.session_store.get_session()
class HomeHandler(BaseHandler):
def get(self):
template = jinja_environment.get_template('main.html')
self.response.out.write(template.render(dict(
facebook_app_id=auth.FACEBOOK_APP_ID,
current_user=self.current_user
)))
def post(self):
url = self.request.get('url')
file = urllib2.urlopen(url)
graph = facebook.GraphAPI(self.current_user['access_token'])
response = graph.put_photo(file, "Test Image")
photo_url = ("http://www.facebook.com/"
"photo.php?fbid={0}".format(response['id']))
self.redirect(str(photo_url))
class LogoutHandler(BaseHandler):
def get(self):
if self.current_user is not None:
self.session['user'] = None
self.redirect('/')
jinja_environment = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(__file__))
)
app = webapp2.WSGIApplication(
[('/', HomeHandler), ('/logout', LogoutHandler)],
debug=True,
config=config
)
我在 example.html 文件中添加了几行来传达新信息：
...
{% if current_user %}
<p><a href="{{ current_user.profile_url }}">
<img src="http://graph.facebook.com/{{ current_user.id }}/picture?type=square"/>
</a></p>
<p>Hello, {{ current_user.name|escape }}</p>
<p>You have a friend named {{ current_user.friend_name|escape }}</p> #################
<p>Movies your friend likes, probably in some weird format: #################
{{ current_user.friend_movies }}</p> ##############
{% endif %}
...
对于我的示例 Facebook 帐户，它有一个名为“Sey Ian”的朋友，现在的输出是：
我有两个主要问题：
Sey Ian 确实有一些喜欢的电影，为什么不显示呢？我是否需要在我的代码中做其他与权限相关的事情？还是我使用错误的语法访问它们（例如，
friend_movies=str(fmov["data"][0]["name"])在这种情况下，我需要类似...对于第一部电影，有点像我如何访问第一个朋友的名字）？在某些时候，我会想要提取更多关于用户和他或她的朋友的信息。考虑到这一点，是否有任何不错的 Python Facebook SDK 图形调用示例？弄清楚如何去做我现在所拥有的已经占据了 FOREVER 的大部分内容。