CGoogleOAuthInterface::GetAccessToken

public function GetAccessToken($redirect_uri = false)
{
	$tokens = $this->getStorageTokens();

	if(is_array($tokens))
	{
		$this->access_token = $tokens["OATOKEN"];
		$this->accessTokenExpires = $tokens["OATOKEN_EXPIRES"];

		if(!$this->code)
		{
			if($this->checkAccessToken())
			{
				return true;
			}
			elseif(isset($tokens["REFRESH_TOKEN"]))
			{
				if($this->getNewAccessToken($tokens["REFRESH_TOKEN"], $this->userId, true))
				{
					return true;
				}
			}
		}

		$this->deleteStorageTokens();
	}

	if($this->code === false)
	{
		return false;
	}

	if($redirect_uri === false)
	{
		if(IsModuleInstalled('bitrix24') && defined('BX24_HOST_NAME'))
		{
			$redirect_uri = CSocServGoogleOAuth::getControllerUrl()."/redirect.php";
		}
		else
		{
			$redirect_uri = $this->getRedirectUri();
		}
	}

	$authParams = [
		"client_id" => $this->appID,
		"code" => $this->code,
		"redirect_uri" => $redirect_uri,
		"grant_type" => "authorization_code",
		"client_secret" => $this->appSecret,
	];

	$this->arResult = $this->getDecodedJson(static::TOKEN_URL, $authParams);

	if(isset($this->arResult["access_token"]) && $this->arResult["access_token"] <> '')
	{
		if(isset($this->arResult["refresh_token"]) && $this->arResult["refresh_token"] <> '')
		{
			$this->refresh_token = $this->arResult["refresh_token"];
		}
		$this->access_token = $this->arResult["access_token"];
		$this->accessTokenExpires = $this->arResult["expires_in"] + time();

		$_SESSION["OAUTH_DATA"] = array(
			"OATOKEN" => $this->access_token,
			"OATOKEN_EXPIRES" => $this->accessTokenExpires,
			"REFRESH_TOKEN" => $this->refresh_token,
		);

		return true;
	}
	return false;
}