PHP。如何获取访问 token 。使用 Google API 的 OAuth 2.0 进行身份验证

Question

I found this function据说可以获取 accessToken，但我什么也没得到。我确实有 $_REQUEST['code'] 以及该函数所需的其他信息。

你知道这里出了什么问题吗？谢谢。

//Oauth 2.0: exchange token for session token so multiple calls can be made to api
if(isset($_REQUEST['code'])){
    $_SESSION['accessToken'] = get_oauth2_token($_REQUEST['code']);
}

//returns session token for calls to API using oauth 2.0
function get_oauth2_token($code) {
    global $client_id;
    global $client_secret;
    global $redirect_uri;

    $oauth2token_url = "https://accounts.google.com/o/oauth2/token";
    $clienttoken_post = array(
    "code" => $code,
    "client_id" => $client_id,
    "client_secret" => $client_secret,
    "redirect_uri" => $redirect_uri,
    "grant_type" => "authorization_code"
    );

    $curl = curl_init($oauth2token_url);

    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $clienttoken_post);
    curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

    $json_response = curl_exec($curl);
    curl_close($curl);

    $authObj = json_decode($json_response);

    if (isset($authObj->refresh_token)){
        //refresh token only granted on first authorization for offline access
        //save to db for future use (db saving not included in example)
        global $refreshToken;
        $refreshToken = $authObj->refresh_token;
    }

    $accessToken = $authObj->access_token;
    return $accessToken;
}

Answer 1

这就是我为获取访问 token 和刷新 token 所做的事情。

创建一个包含以下代码的文件:

<?php

if (isset($_GET['code'])) {
    // try to get an access token
    $code = $_GET['code'];
    $url = 'https://accounts.google.com/o/oauth2/token';
    $params = array(
        "code" => $code,
        "client_id" => YOUR_CLIENT_ID,
        "client_secret" => YOUR_CLIENT_SECRET,
        "redirect_uri" => 'http://' . $_SERVER["HTTP_HOST"] . $_SERVER["PHP_SELF"],
        "grant_type" => "authorization_code"
    );

    $ch = curl_init();
    curl_setopt($ch, constant("CURLOPT_" . 'URL'), $url);
    curl_setopt($ch, constant("CURLOPT_" . 'POST'), true);
    curl_setopt($ch, constant("CURLOPT_" . 'POSTFIELDS'), $params);
    $output = curl_exec($ch);
    $info = curl_getinfo($ch);
    curl_close($ch);
    if ($info['http_code'] === 200) {
        header('Content-Type: ' . $info['content_type']);
        return $output;
    } else {
        return 'An error happened';
    }
} else {

    $url = "https://accounts.google.com/o/oauth2/auth";

    $params = array(
        "response_type" => "code",
        "client_id" => YOUR_CLIENT_ID,
        "redirect_uri" => 'http://' . $_SERVER["HTTP_HOST"] . $_SERVER["PHP_SELF"],
        "scope" => "https://www.googleapis.com/auth/plus.me"
    );

    $request_to = $url . '?' . http_build_query($params);

    header("Location: " . $request_to);
}

现在，将 YOUR_CLIENT_ID 和 YOUR_CLIENT_SECRET 替换为您的客户端 ID 和客户端 key 。

确保您的范围正确。例如，如果您想访问 Analytics，则应为 https://www.googleapis.com/auth/analytics。

如果运行该文件，您应该会看到 OAuth2 批准屏幕。

如果您现在按接受，您应该得到如下所示的结果:

{
  "access_token" : YOUR_ACCESS_TOKEN,
  "token_type" : "Bearer",
  "expires_in" : 3600,
  "refresh_token" : YOUR_REFRESH_TOKEN
}

结果可能包含其他字段，具体取决于您申请的范围。