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<?php |
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/** |
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* Created by PhpStorm. |
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* User: jaredchu |
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* Date: 12/2/16 |
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* Time: 4:25 PM |
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*/ |
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namespace JC\Firebase; |
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use Firebase\JWT\JWT; |
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use JC\JCRequest; |
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class OAuth |
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{ |
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/* |
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* token life time in second |
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* */ |
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public $tokenLifeTime; |
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public $key; |
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public $iss; |
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protected $expireTimestamp; |
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protected $accessToken; |
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/** |
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* OAuth constructor. |
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* |
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* @param $key |
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* @param $iss |
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* @param $lifeTime |
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*/ |
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public function __construct($key, $iss, $lifeTime = 3600) |
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{ |
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$this->key = $key; |
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$this->iss = $iss; |
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$this->tokenLifeTime = $lifeTime; |
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} |
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public static function fromJson($jsonString, $lifeTime = 3600) |
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{ |
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if ($jsonString) { |
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$privateKey = $jsonString->private_key; |
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$serviceAccount = $jsonString->client_email; |
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return new static($privateKey, $serviceAccount, $lifeTime); |
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} else { |
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throw new \Exception("can't get data from key file"); |
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} |
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} |
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public static function fromKeyFile($keyFile, $lifeTime = 3600) |
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{ |
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try { |
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$jsonString = json_decode(file_get_contents($keyFile)); |
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} catch (\Exception $exception) { |
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$jsonString = JCRequest::get($keyFile)->json(); |
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} |
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return static::fromJson($jsonString, $lifeTime); |
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} |
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protected function requestAccessToken() |
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{ |
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$currentTimestamp = time(); |
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$this->expireTimestamp = $currentTimestamp + $this->tokenLifeTime; |
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$jsonToken = array( |
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"iss" => $this->iss, |
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"scope" => "https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email", |
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"aud" => "https://www.googleapis.com/oauth2/v4/token", |
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"exp" => $this->expireTimestamp, |
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"iat" => $currentTimestamp |
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); |
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$jwt = JWT::encode($jsonToken, $this->key, 'RS256'); |
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$OAuthResponse = JCRequest::post('https://www.googleapis.com/oauth2/v4/token', array( |
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'grant_type' => 'urn:ietf:params:oauth:grant-type:jwt-bearer', |
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'assertion' => $jwt |
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)); |
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if ($OAuthResponse->status() == 200) { |
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$this->accessToken = json_decode($OAuthResponse->body())->access_token; |
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return true; |
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} |
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return false; |
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} |
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public function getAccessToken() |
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{ |
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$currentTime = time(); |
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if ($this->expireTimestamp < $currentTime) { |
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$startTime = time(); |
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$this->requestAccessToken(); |
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$endTime = time(); |
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$this->expireTimestamp -= ($endTime - $startTime); |
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} |
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return $this->accessToken; |
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} |
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} |
jaredchu /
JC-Firebase-PHP
