Facebook接入（上）

一、开发者后台账号设置
web site
    sit url: http://apps.facebook.com/app_name/
facebook Integration
    canvas url: http://your_real_domain/
    iframe size: auto_resize
    bookmark url: you_app_url
    tab name: you_app_name
    tab url: your_real_domain
advanced
    sandbox mode: enable disable时，只有测试号可以登录app
    Remove Deprecated Auth Methods：disabled
    Stream post URL security: enabled
    OAuth 2.0 for Canvas: enabled
    Timezone-less events: enabled
    Upgrade to Requests 2.0: disabled
    Develop Using Deprecated FBML Canvas: disabled

二、验证和授权代码

def parse_signed_request(signed_request):
    signed_request = str(signed_request)
    encoded_sig, payload = signed_request.split(".", 2)
    encoded_sig2 = str(encoded_sig) + "=="
    payload2 = str(payload) + "=="
    sig = base64.b64decode(encoded_sig2, "-_")
    data = simplejson.loads(base64.b64decode(payload2, "-_"))
    expected_sig = hmac.new(settings.SNS_SECRET_KEY, payload, hashlib.sha256).digest()
    sig_ok = expected_sig == sig
    return data, sig_ok

if request.POST.has_key('signed_request'):
    signed_request = request.POST.get("signed_request", '')
    data, sig_ok = parse_signed_request(signed_request)
    if not sig_ok:
        return HttpResponse("SIG_ERROR")
    
    if not data.has_key('user_id') or not data.has_key('oauth_token'):
        app_id = settings.SNS_APP_ID
        sns_url = settings.SNS_URL
        redirect_uri = urllib.quote_plus(sns_url)
        redirect_url = "https://www.facebook.com/dialog/oauth?client_id=%s&redirect_uri=%s&scope=email,read_stream" %(app_id, redirect_uri)
        return render_to_response('%s/freegift/redirect.html' % (settings.SNS), {'redirect_url': redirect_url})
    access_token = data['oauth_token']
    to_sns_id = data['user_id']
else:
    return HttpResponse("")

三、REST API

def get_request_info(access_token, request_id):
    try:
        graph_url = "https://graph.facebook.com/%s?access_token=%s" % (request_id, access_token)
        data = simplejson.loads( urllib2.urlopen(graph_url).read() )
        
        return data['from']['id'], data['to']['id']
    except:
        return '', ''


def check_is_fan(access_token, sns_id):
    try:
        q = 'SELECT uid FROM page_fan WHERE page_id="%s" and uid=%s' % (settings.SNS_APP_ID , sns_id)
        q = urllib2.quote(q) 
        graph_url = "https://api.facebook.com/method/fql.query?access_token=%s&query=%s&format=json" % (access_token, q)

        fan = simplejson.loads( urllib2.urlopen(graph_url).read())

        if len(fan)>0:
            return True
        return False
    except:
        return False


def convert_session_to_access_token(skey):
    try:
        service_url = 'https://graph.facebook.com/oauth/exchange_sessions'
        params = {}
        params['type'] = 'client_cred'
        params['client_id'] = settings.SNS_APP_ID
        params['client_secret'] = settings.SNS_SECRET_KEY
        params['sessions'] = skey
        
        data = urllib.urlencode(params)
        req = urllib2.Request(service_url)
        result = simplejson.loads( urllib2.urlopen(req, data).read() )
        
        return result[0]['access_token']
    except:
        return 'CONVERT_FAILED'


def get_sns_id(access_token):
    try:
        graph_url = "https://graph.facebook.com/me?access_token=%s&fields=id" % access_token
        profile = simplejson.loads( urllib2.urlopen(graph_url).read() )
        
        return profile['id']
    except:
        return 'SNS_API_ERROR'


def get_sns_user(access_token, sns_id, fields='name,picture'):
    try:
        graph_url = "https://graph.facebook.com/me?access_token=%s&fields=id,name,picture" % access_token
        user = simplejson.loads( urllib2.urlopen(graph_url).read() )
        
        return user['name'],user['picture']
    except:
        return 'SNS_API_ERROR'

def get_third_party_id(access_token, sns_id):
    try:
        graph_url = "https://graph.facebook.com/me?access_token=%s&fields=third_party_id" % access_token
        user = simplejson.loads( urllib2.urlopen(graph_url).read() )
        
        return user['third_party_id']
    except:
        return 'SNS_API_ERROR'

def get_app_friends(access_token):
    try:
        graph_url = "https://api.facebook.com/method/friends.getAppUsers?access_token=%s&format=json" % access_token
        friend_ids = simplejson.loads( urllib2.urlopen(graph_url).read() )
        if type(friend_ids) == types.ListType:
            return friend_ids
        else:
            return []
    except:
        return 'SNS_API_ERROR'

def get_all_friends(access_token):
    try:
        graph_url = "https://api.facebook.com/method/friends.get?access_token=%s&format=json" % access_token
        friend_ids = simplejson.loads( urllib2.urlopen(graph_url).read() )
        if type(friend_ids) == types.ListType:
            return friend_ids
        else:
            return []
    except:
        return 'SNS_API_ERROR'
       
def get_are_friends(access_token, uids1, uids2):
    try:
        graph_url = "https://api.facebook.com/method/friends.areFriends?uids1=%s&uids2=%s&access_token=%s&format=json" % (uids1, uids2, access_token)
        are_friends = simplejson.loads( urllib2.urlopen(graph_url).read() )
         
        return are_friends[0]["are_friends"]
    except:
        return 'SNS_API_ERROR'

def get_fan_status(access_token, sns_id):
    try:
        q = 'SELECT uid FROM page_fan WHERE page_id="%s" and uid=%s' % (settings.SNS_APP_ID , sns_id)
        q = urllib2.quote(q) 
        graph_url = "https://api.facebook.com/method/fql.query?access_token=%s&query=%s&format=json" % (access_token, q)

        fan = simplejson.loads( urllib2.urlopen(graph_url).read())

        if len(fan)>0:
            return 1
        return 0
    except:
        return 'SNS_API_ERROR'
        

def get_progressbar_status(access_token, sns_id):
    try:
        q = "SELECT bookmarked,email,publish_stream FROM permissions WHERE uid=%s" % sns_id
        q = urllib2.quote(q) 
        graph_url = "https://api.facebook.com/method/fql.query?access_token=%s&query=%s&format=json" % (access_token, q)

        bookmarked = simplejson.loads( urllib2.urlopen(graph_url).read())

        return bookmarked[0]
    except:
        return 'SNS_API_ERROR'