facebook OAuth + PHP でログイン処理の実装


Twitter に続いて、会員制サイト作るときに facebook のアカウントでログインできるようにするアレです。
激しく今更感がありますが、メモ用にまとめます。

  • PHP
  • ライブラリとかは使いません。json_decode 使うのでPHPのバージョンが古いと入ってないかも。入ってない場合は「pecl install json」とかで導入してください。

イメージ

facebook API を使うための登録

これが一番大変です。まずアプリケーション登録ページ
「新しいアプリを作成」をクリック

App Name にアプリケーション名を入れて「続行」

うっとしいchapchaを入力して「送信」

無事作成されるとこんな画面になるので「App ID」「App Secret」をメモります。
そして画像下の「Website with Facebook Login」をクリックして開き、アプリのURLを http or https 付きで入力して、「App Domains」にアプリのURL(サブドメインなし)を入力。「変更を保存」をクリックして設定を保存します。

↑の画面にならない場合

こんなメッセージがでる
You've been blocked from creating apps because we haven't been able to verify your account

どうも作りたてのアカウントだとNGなようです。。一定数「いいね」されないとダメとか?しばらくfacebook使ってみて再登録試しましょう。

携帯認証 または クレカ登録が求められる

面倒ですが初回だけなのでどちらか選んで認証を終わらせます。携帯キャリアのメールなんて使ってねーよ、って人、結構いると思うんですけどねぇ・・・こーいうとこが嫌いです、facebook(´・ω・`)

login page を作る

図の一番上のログイン用ページを作ります。よくある作りならログインページが出る == session が切れてるはずなので、自前ログイン、Twitterアカウントからログイン、Facebookアカウントでログイン、Googleアカウントでログインみたいなページになると思います。

最低限、getCode.php へのリンクがあればOKです。

getCode.php を作る

getCode.php

<?php

define('APP_ID', 'メモった App ID');
define('APP_SECRET', 'メモった App Secret');
define('CALLBACK', 'http://app.example.com/callback.php');

$authURL = 'http://www.facebook.com/dialog/oauth?client_id=' .
	APP_ID . '&redirect_uri=' . urlencode(CALLBACK);

header("Location: " . $authURL);

10行しかないけどコードの説明

3〜4行目: メモったApp ID, App Secret を設定します。
5行目     : facebookから戻ってくるURLを設定。もちろん http or https から入れてください。
7〜8行目: facebook認証用のURLを生成
10行目   : 生成したURLへのRedirect

getCode.php へアクセスすると初回は、facebook認証画面へ飛ばされて

認証済み+2回目以降ならfacebook認証画面から直接Redirectされて callback に指定したURLへ飛ばされるようになります。

callback.php を作る

facebook認証画面からの遷移先、callback.php を作ります。
callback.php

<?php

define('APP_ID', 'メモったApp ID');
define('APP_SECRET', 'メモったApp Secret');

$code = $_REQUEST['code'];

$token_url = 'https://graph.facebook.com/oauth/access_token?client_id='.
	APP_ID . '&redirect_uri=' . urlencode(CALLBACK) . '&client_secret='.
	APP_SECRET . '&code=' . $code;

// access token 取得
$access_token = file_get_contents($token_url);

// ユーザ情報json取得してdecode
$user_json = file_get_contents('https://graph.facebook.com/me?' . $access_token);
$user = json_decode($user_json);

// facebook の user_id + name(表示名)をセット
$user_id = $user->id;
$name    = $user->name;

// 初回ユーザかチェックするロジック
if(){

	// 初回ユーザならDatabaseへの登録処理・・・などなど

}

// ログイン後の画面へ遷移

コードの説明

3〜4行目: メモったApp ID, App Secret を設定します。
6行目: facebookからRedirectされる際に code が渡されるのでセット
8〜10行目: 取得した code + App ID + App Secret から token 取得用のURLを生成
13行目: token を取得
16行目: token を使ってユーザ情報を取得。
17行目: 取得したユーザ情報を json_decode して利用できるように。
20〜21行目: $user (Object) から facebook IDとフルネームをセット。
24行目: facebook ID と自前アプリのデータベースなどを比較して初回ユーザかチェック。初回なら登録処理とか。
30行目: ログイン画面に遷移、とか

以上です。次はGoogle OAuthでログイン処理を書く予定。

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