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Facebook Graph APIを使用して500を超える要素(友達リストなど)を返す場合は、ページングが必要です。これを行うための良い方法は何ですか?

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これが、自分のアプリでページングを使用する方法です。

http://developsocialapps.com/facebook-friends-list-and-paging/

ライブラリには、必要なコードのほとんどが含まれています。主なメソッドはgetGraphObjectWithPagingです。グラフAPIを使用してオブジェクトを取得し、応答に次のページがあるか、$ maxpagesに到達するまで、ループを続けます。1つの特徴は、Facebookが次のページを取得したばかりの同じページとして返すことがあるため、これをチェックしてその時点で停止することです。

class FacebookApp {               

    public $appId;
    private $appSecret;
    private $nameSpace;
    public $userId;
    public $token;
    public $tokenExpires;

    // get your own from http://www.w3.org/P3P/
    public $p3p = 'P3P:CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"'; 

    /*  construct object 
        appid, secret, and namespace from app settings  */
    public function __construct($id, $secret, $namespace) {
        $this->appId = $id;
        $this->appSecret = $secret;
        $this->nameSpace = $namespace;
    }

    /*  return json data from a graph api object using paging   
        $object = object to get
        limit = limit parameter for API object
        maxpages = maximum number of pages to get   */
    function getGraphObjectWithPaging($object,$limit=500,$maxpages=10) {
        $data = array();
        $url = $this->getGraphUrl($object,$limit);
        // loop through API calls until maxpages or no paging->next
        while ($maxpages > 0) {
            $response = $this->makeCurlRequest($url);
            if ($repsonse === false) {
                // something went wrong
                break;
            } else {
                $jsonarray = json_decode($response,true);
                if (isset($jsonarray['error'])) {
                    // something went wrong
                    break;
                } else {
                    // add current data to data array
                    $data = array_merge ($data,$jsonarray['data']);
                    if (isset($jsonarray['paging']['next'])) {
                        if ($url == $jsonarray['paging']['next']) {
                            // for some reason facebook sometimes returns a next url which is the same as we just got, so exit here
                            break;
                        } else {
                            // keep looping
                            $url = $jsonarray['paging']['next'];
                            $maxpages--;
                        }
                    } else {
                        // no more pages
                        break;
                    }
                }
            }
        }
        return array("data"=>$data); // using data so it is the same format as other API repsonses
    }

    /*  constructs graphs url   */
    public function getGraphUrl($object,$limit=false) {
        $url = "https://graph.facebook.com/".$object;
        if (strpos($url,"?") === false) $url .= "?";
        else $url .= "&";
        $url .= "access_token=".$this->token;
        if ($limit !== false) $url .= "&limit=".$limit;
        return $url;
    }

    /*  uses curl to get a url, use $postarray to make a post, otherwise it will get    */
    public function makeCurlRequest($url,$postarray=false) { 
        $return = false;
        try {
            $ch = curl_init(); 
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_HEADER, false); 
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
            if($postarray !== false){ 
                curl_setopt ($ch, CURLOPT_POST, true); 
                curl_setopt ($ch, CURLOPT_POSTFIELDS, $postarray); 
            } 
            $response = curl_exec($ch); 
            $responseInfo = curl_getinfo($ch); 
            curl_close($ch); 
            if ($responseInfo['http_code']==200) { 
                $return = $response; 
            } 
        } catch (Exception $e) {
            $return = false; 
        }
        return $return;
    } 

    /*  sets userid and token from signed request, return true or false if authorized   */
    public function initOauthUserFromSignedRequest() {
        $authorized = false;
        if (isset($_REQUEST['signed_request'])) {
            $data = $this->parseSignedRequest($_REQUEST['signed_request']);
            if ($data !== false) {
                if (isset($data['user_id']) && isset($data['oauth_token'])) {
                    $this->userId = $data['user_id'];
                    $this->token = $data['oauth_token'];
                    $this->tokenExpires = $data['expires'];
                    $authorized = true;
                }
            }
        }
        return $authorized;
    }

    /*  require user to authorize and have permissions for page
        redirect_uri = url to return after user has authorized like redirect.php
        success_uri = url to redirect to on successful authorization like mypage.php
        scope = comma separted list of permissions  */
    function requireAuthorization($redirect_uri,$success_uri=false,$scope=false) {
        if ($success_uri === false) {
            // if no success_uri use current page, all files for app must be in same directory
            $success_uri = substr($_SERVER['REQUEST_URI'],strrpos($_SERVER['REQUEST_URI'],"/")+1); 
        }
        $this->setCookie ("success_uri",$success_uri,0); // we will use this on the redirect_uri page
        $requireauth = true;
        if ($this->initOauthUserFromSignedRequest()) { // user has authorized
            if (($scope === false) || ($this->hasAllPermissions($scope))) { // now check for perms
                $requireauth = false;
            }
        }
        if ($requireauth) { // user is either not authorized or doesn't have permissions
            $url = $this->getAuthUrl($this->getCanvasUrl($redirect_uri),$scope);
            echo "<html>\n<body>\n<script>\ntop.location.href='".$url."';\n</script></body></html>";
            exit();
        }
    }

    /*  checks to see if has permissions, scope is comma separated list */
    public function hasAllPermissions($scope) {
        $return = false;
        $cookiename = "permissions_".$this->appId."_".$this->userId;
        $requiredpermissions = explode(",",$scope);
        // first check cookie
        if (isset($_COOKIE[$cookiename])) {
            $return = true;
            $permissions = json_decode($_COOKIE[$cookiename],true);
            foreach ($requiredpermissions as $perm) {
                if ($permissions['data'][0][$perm] != 1) {
                    $return = false;
                    break;
                }
            }
        }
        // if didn't have all in cookie, then see if it is in graph 
        if ($return == false) {
            $permissions = $this->getGraphObject("me/permissions");
            if ($permissions !== false) {
                $this->setCookie($cookiename,json_encode($permissions),0);
                $return = true;
                foreach ($requiredpermissions as $perm) {
                    if ($permissions['data'][0][$perm] != 1) {
                        $return = false;
                        break;
                    }
                }   
            }
        }
        return $return;
    }

    /*  sets a cookie with p3p headers  */
    public function setCookie($name,$value,$expires) {
        if ($this->p3p != '') {
            header($this->p3p);
            $this->p3p = '';
        }
        setcookie ($name,$value,$expires,"/"); 
    }

    /*  returns url for oauth authorization
        redirect_uri = url to return after user has authorized
        scope = comma separted list of permissions  */
    public function getAuthUrl($redirect_uri,$scope=false) {
        $url = "https://www.facebook.com/dialog/oauth/?client_id=".$this->appId."&redirect_uri=".rawurlencode($redirect_uri);
        if ($scope !== false) $url .= "&scope=".rawurlencode($scope);
        return $url;
    }

    /* returns url to app canvas page, $page like mypage.php?foo=bar    */
    public function getCanvasUrl($page) {
        if ($_SERVER['HTTPS'] == "on") $protocol = "https";
        else $protocol = "http";
        return $protocol."://apps.facebook.com/".$this->nameSpace."/".$page;
    }

    /*  parses signed_request parameter and returns data object, returns false if sigs don't match  */
    public function parseSignedRequest($signed_request) {
        list($encoded_sig, $payload) = explode('.', $signed_request, 2); 
        $data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
        $sig = base64_decode(strtr($encoded_sig, '-_', '+/'));
        $expected_sig = hash_hmac('sha256', $payload, $this->appSecret, true);
        if ($sig == $expected_sig) {
            return $data;
        } else {
            return false;
        }
    }

}

ページでの使用方法は次のとおりです。

$facebookapp = new FacebookApp($GLOBALS['facebookAppId'],$GLOBALS['facebookAppSecret'],$GLOBALS['facebookNamespace']);

$facebookapp->requireAuthorization($GLOBALS['facebookRedirectPage']);

$friends = $facebookapp->getGraphObjectWithPaging("me/friends");
于 2012-09-07T14:48:31.450 に答える