Done, I 've placed my facebook.py in attachment. Not sure if any changes to web2py are necessary as I'm using a slightly modified (by me and applying a few patches on the rep) version of http://code.google.com/p/cfhowes/source/browse/#hg/web2py_multiauth instead of the standard auth. My guess is that no changes to web2py are necessary, as that get_user_from_cookie simply does not work as it is and it just does with this change.
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#!/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. """Python client library for the Facebook Platform. This client library is designed to support the Graph API and the official Facebook JavaScript SDK, which is the canonical way to implement Facebook authentication. Read more about the Graph API at http://developers.facebook.com/docs/api. You can download the Facebook JavaScript SDK at http://github.com/facebook/connect-js/. If your application is using Google AppEngine's webapp framework, your usage of this module might look like this: user = facebook.get_user_from_cookie(self.request.cookies, key, secret) if user: graph = facebook.GraphAPI(user["access_token"]) profile = graph.get_object("me") friends = graph.get_connections("me", "friends") """ import cgi import time import urllib import urllib2 import httplib import hashlib import hmac import base64 import logging import socket # Find a JSON parser try: import simplejson as json except ImportError: try: from django.utils import simplejson as json except ImportError: import json _parse_json = json.loads # Find a query string parser try: from urlparse import parse_qs except ImportError: from cgi import parse_qs class GraphAPI(object): """A client for the Facebook Graph API. See http://developers.facebook.com/docs/api for complete documentation for the API. The Graph API is made up of the objects in Facebook (e.g., people, pages, events, photos) and the connections between them (e.g., friends, photo tags, and event RSVPs). This client provides access to those primitive types in a generic way. For example, given an OAuth access token, this will fetch the profile of the active user and the list of the user's friends: graph = facebook.GraphAPI(access_token) user = graph.get_object("me") friends = graph.get_connections(user["id"], "friends") You can see a list of all of the objects and connections supported by the API at http://developers.facebook.com/docs/reference/api/. You can obtain an access token via OAuth or by using the Facebook JavaScript SDK. See http://developers.facebook.com/docs/authentication/ for details. If you are using the JavaScript SDK, you can use the get_user_from_cookie() method below to get the OAuth access token for the active user from the cookie saved by the SDK. """ def __init__(self, access_token=None, timeout=None): self.access_token = access_token self.timeout = timeout def get_object(self, id, **args): """Fetchs the given object from the graph.""" return self.request(id, args) def get_objects(self, ids, **args): """Fetchs all of the given object from the graph. We return a map from ID to object. If any of the IDs are invalid, we raise an exception. """ args["ids"] = ",".join(ids) return self.request("", args) def get_connections(self, id, connection_name, **args): """Fetchs the connections for given object.""" return self.request(id + "/" + connection_name, args) def put_object(self, parent_object, connection_name, **data): """Writes the given object to the graph, connected to the given parent. For example, graph.put_object("me", "feed", message="Hello, world") writes "Hello, world" to the active user's wall. Likewise, this will comment on a the first post of the active user's feed: feed = graph.get_connections("me", "feed") post = feed["data"][0] graph.put_object(post["id"], "comments", message="First!") See http://developers.facebook.com/docs/api#publishing for all of the supported writeable objects. Certain write operations require extended permissions. For example, publishing to a user's feed requires the "publish_actions" permission. See http://developers.facebook.com/docs/publishing/ for details about publishing permissions. """ assert self.access_token, "Write operations require an access token" return self.request(parent_object + "/" + connection_name, post_args=data) def put_wall_post(self, message, attachment={}, profile_id="me"): """Writes a wall post to the given profile's wall. We default to writing to the authenticated user's wall if no profile_id is specified. attachment adds a structured attachment to the status message being posted to the Wall. It should be a dictionary of the form: {"name": "Link name" "link": "http://www.example.com/";, "caption": "{*actor*} posted a new review", "description": "This is a longer description of the attachment", "picture": "http://www.example.com/thumbnail.jpg"} """ return self.put_object(profile_id, "feed", message=message, **attachment) def put_comment(self, object_id, message): """Writes the given comment on the given post.""" return self.put_object(object_id, "comments", message=message) def put_like(self, object_id): """Likes the given post.""" return self.put_object(object_id, "likes") def delete_object(self, id): """Deletes the object with the given ID from the graph.""" self.request(id, post_args={"method": "delete"}) def delete_request(self, user_id, request_id): """Deletes the Request with the given ID for the given user.""" conn = httplib.HTTPSConnection('graph.facebook.com') url = '/%s_%s?%s' % ( request_id, user_id, urllib.urlencode({'access_token': self.access_token}), ) conn.request('DELETE', url) response = conn.getresponse() data = response.read() response = _parse_json(data) # Raise an error if we got one, but don't not if Facebook just # gave us a Bool value if (response and isinstance(response, dict) and response.get("error")): raise GraphAPIError(response) conn.close() def put_photo(self, image, message=None, album_id=None, **kwargs): """Uploads an image using multipart/form-data. image=File like object for the image message=Caption for your image album_id=None posts to /me/photos which uses or creates and uses an album for your application. """ object_id = album_id or "me" #it would have been nice to reuse self.request; #but multipart is messy in urllib post_args = { 'access_token': self.access_token, 'source': image, 'message': message, } post_args.update(kwargs) content_type, body = self._encode_multipart_form(post_args) req = urllib2.Request(("https://graph.facebook.com/%s/photos"; % object_id), data=body) req.add_header('Content-Type', content_type) try: data = urllib2.urlopen(req).read() #For Python 3 use this: #except urllib2.HTTPError as e: except urllib2.HTTPError, e: data = e.read() # Facebook sends OAuth errors as 400, and urllib2 # throws an exception, we want a GraphAPIError try: response = _parse_json(data) # Raise an error if we got one, but don't not if Facebook just # gave us a Bool value if (response and isinstance(response, dict) and response.get("error")): raise GraphAPIError(response) except ValueError: response = data return response # based on: http://code.activestate.com/recipes/146306/ def _encode_multipart_form(self, fields): """Encode files as 'multipart/form-data'. Fields are a dict of form name-> value. For files, value should be a file object. Other file-like objects might work and a fake name will be chosen. Returns (content_type, body) ready for httplib.HTTP instance. """ BOUNDARY = '----------ThIs_Is_tHe_bouNdaRY_$' CRLF = '\r\n' L = [] for (key, value) in fields.items(): logging.debug("Encoding %s, (%s)%s" % (key, type(value), value)) if not value: continue L.append('--' + BOUNDARY) if hasattr(value, 'read') and callable(value.read): filename = getattr(value, 'name', '%s.jpg' % key) L.append(('Content-Disposition: form-data;' 'name="%s";' 'filename="%s"') % (key, filename)) L.append('Content-Type: image/jpeg') value = value.read() logging.debug(type(value)) else: L.append('Content-Disposition: form-data; name="%s"' % key) L.append('') if isinstance(value, unicode): logging.debug("Convert to ascii") value = value.encode('ascii') L.append(value) L.append('--' + BOUNDARY + '--') L.append('') body = CRLF.join(L) content_type = 'multipart/form-data; boundary=%s' % BOUNDARY return content_type, body def request(self, path, args=None, post_args=None): """Fetches the given path in the Graph API. We translate args to a valid query string. If post_args is given, we send a POST request to the given path with the given arguments. """ args = args or {} if self.access_token: if post_args is not None: post_args["access_token"] = self.access_token else: args["access_token"] = self.access_token post_data = None if post_args is None else urllib.urlencode(post_args) try: file = urllib2.urlopen("https://graph.facebook.com/"; + path + "?" + urllib.urlencode(args), post_data, timeout=self.timeout) except urllib2.HTTPError, e: response = _parse_json(e.read()) raise GraphAPIError(response) except TypeError: # Timeout support for Python <2.6 if self.timeout: socket.setdefaulttimeout(self.timeout) file = urllib2.urlopen("https://graph.facebook.com/"; + path + "?" + urllib.urlencode(args), post_data) try: fileInfo = file.info() if fileInfo.maintype == 'text': response = _parse_json(file.read()) elif fileInfo.maintype == 'image': mimetype = fileInfo['content-type'] response = { "data": file.read(), "mime-type": mimetype, "url": file.url, } else: raise GraphAPIError('Maintype was not text or image') finally: file.close() if response and isinstance(response, dict) and response.get("error"): raise GraphAPIError(response["error"]["type"], response["error"]["message"]) return response def fql(self, query, args=None, post_args=None): """FQL query. Example query: "SELECT affiliations FROM user WHERE uid = me()" """ args = args or {} if self.access_token: if post_args is not None: post_args["access_token"] = self.access_token else: args["access_token"] = self.access_token post_data = None if post_args is None else urllib.urlencode(post_args) """Check if query is a dict and use the multiquery method else use single query """ if not isinstance(query, basestring): args["queries"] = query fql_method = 'fql.multiquery' else: args["query"] = query fql_method = 'fql.query' args["format"] = "json" try: file = urllib2.urlopen("https://api.facebook.com/method/"; + fql_method + "?" + urllib.urlencode(args), post_data, timeout=self.timeout) except TypeError: # Timeout support for Python <2.6 if self.timeout: socket.setdefaulttimeout(self.timeout) file = urllib2.urlopen("https://api.facebook.com/method/"; + fql_method + "?" + urllib.urlencode(args), post_data) try: content = file.read() response = _parse_json(content) #Return a list if success, return a dictionary if failed if type(response) is dict and "error_code" in response: raise GraphAPIError(response) except Exception, e: raise e finally: file.close() return response def extend_access_token(self, app_id, app_secret): """ Extends the expiration time of a valid OAuth access token. See <https://developers.facebook.com/roadmap/offline-access-removal/ #extend_token> """ args = { "client_id": app_id, "client_secret": app_secret, "grant_type": "fb_exchange_token", "fb_exchange_token": self.access_token, } response = urllib.urlopen("https://graph.facebook.com/oauth/"; "access_token?" + urllib.urlencode(args)).read() query_str = parse_qs(response) if "access_token" in query_str: result = {"access_token": query_str["access_token"][0]} if "expires" in query_str: result["expires"] = query_str["expires"][0] return result else: response = json.loads(response) raise GraphAPIError(response) class GraphAPIError(Exception): def __init__(self, result): #Exception.__init__(self, message) #self.type = type self.result = result try: self.type = result["error_code"] except: self.type = "" # OAuth 2.0 Draft 10 try: self.message = result["error_description"] except: # OAuth 2.0 Draft 00 try: self.message = result["error"]["message"] except: # REST server style try: self.message = result["error_msg"] except: self.message = result Exception.__init__(self, self.message) def parse_signed_request(signed_request, application_secret_key): """Parse a signed request, returning a dictionary describing its payload.""" def decode(encoded): padding = '=' * (len(encoded) % 4) return base64.urlsafe_b64decode(encoded + padding) try: encoded_signature, encoded_payload = (str(string) for string in signed_request.split('.', 2)) signature = decode(encoded_signature) signed_request_data = json.loads(decode(encoded_payload)) except (TypeError, ValueError): raise Exception("Signed request had a corrupt payload") if signed_request_data.get('algorithm', '').upper() != 'HMAC-SHA256': raise Exception("Signed request is using an unknown algorithm") expected_signature = hmac.new(application_secret_key, msg=encoded_payload, digestmod=hashlib.sha256).digest() if signature != expected_signature: raise Exception("Signed request signature mismatch") return signed_request_data def get_user_from_cookie(cookies, app_id, app_secret): """Parses the cookie set by the official Facebook JavaScript SDK. cookies should be a dictionary-like object mapping cookie names to cookie values. If the user is logged in via Facebook, we return a dictionary with the keys "uid" and "access_token". The former is the user's Facebook ID, and the latter can be used to make authenticated requests to the Graph API. If the user is not logged in, we return None. Download the official Facebook JavaScript SDK at http://github.com/facebook/connect-js/. Read more about Facebook authentication at http://developers.facebook.com/docs/authentication/. """ cookie = cookies.get("fbsr_" + app_id, "") if not cookie: return None response = parse_signed_request(cookie.value, app_secret) if not response: return None args = dict( code = response['code'], client_id = app_id, client_secret = app_secret, redirect_uri = '', ) file = urllib.urlopen("https://graph.facebook.com/oauth/access_token?"; + urllib.urlencode(args)) try: token_response = file.read() finally: file.close() access_token = cgi.parse_qs(token_response)["access_token"][-1] return dict( uid = response["user_id"], access_token = access_token, ) def auth_url(app_id, canvas_url, perms=None, **kwargs): url = "https://www.facebook.com/dialog/oauth?"; kvps = {'client_id': app_id, 'redirect_uri': canvas_url} if perms: kvps['scope'] = ",".join(perms) kvps.update(kwargs) return url + urllib.urlencode(kvps) def get_access_token_from_code(code, redirect_uri, app_id, app_secret): """Get an access token from the "code" returned from an OAuth dialog. Returns a dict containing the user-specific access token and its expiration date (if applicable). """ args = { "code": code, "redirect_uri": redirect_uri, "client_id": app_id, "client_secret": app_secret, } # We would use GraphAPI.request() here, except for that the fact # that the response is a key-value pair, and not JSON. response = urllib.urlopen("https://graph.facebook.com/oauth/access_token"; + "?" + urllib.urlencode(args)).read() query_str = parse_qs(response) if "access_token" in query_str: result = {"access_token": query_str["access_token"][0]} if "expires" in query_str: result["expires"] = query_str["expires"][0] return result else: response = json.loads(response) raise GraphAPIError(response) def get_app_access_token(app_id, app_secret): """Get the access_token for the app. This token can be used for insights and creating test users. app_id = retrieved from the developer page app_secret = retrieved from the developer page Returns the application access_token. """ # Get an app access token args = {'grant_type': 'client_credentials', 'client_id': app_id, 'client_secret': app_secret} file = urllib2.urlopen("https://graph.facebook.com/oauth/access_token?"; + urllib.urlencode(args)) try: result = file.read().split("=")[1] finally: file.close() return result
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