如何解决刷新 Google Analytics API 访问令牌时出现的'invalid_grant”错误？

使用 Google API 客户端刷新访问令牌

与 Google Analytics API (V3) 交互时，处理令牌过期至关重要访问数据。 Google API 客户端提供了refreshToken() 方法来使用刷新令牌获取新的访问令牌。但是，尝试使用此方法时，您可能会遇到“invalid_grant”错误。

了解令牌过期

访问令牌的寿命有限，通常为一小时。令牌过期后，必须获取新的访问令牌。 freshToken() 方法可用于检索新的访问令牌。

调试“invalid_grant”错误

“invalid_grant”错误表示刷新令牌正在使用的内容无效或已过期。要解决此问题，请验证以下内容：

• 确保您使用与过期访问令牌关联的正确刷新令牌。
• 检查刷新令牌是否尚未过期（其寿命约为 6 个月）。

代码示例

下面是一个简化的示例，演示如何刷新访问令牌并将其存储在数据库中：

<?php
use Google\Client;
use Google\Service\Analytics;

// Set up your client and credentials
$client = new Client();
$client->setClientId('YOUR_CLIENT_ID');
$client->setClientSecret('YOUR_CLIENT_SECRET');
$client->setRedirectUri('YOUR_REDIRECT_URI');
$client->setScopes('https://www.googleapis.com/auth/analytics.readonly');
$client->setState('offline');

// Retrieve the original access token (with a refresh token) from your database
$original_access_token = json_decode($token, true);
$refresh_token = $original_access_token['refresh_token'];

// Check if the original access token has expired
$time_created = $original_access_token['created'];
$time_now = time();
$time_diff = $time_now - $time_created;

// Refresh the access token if it has expired
if ($time_diff > 3600) {
    // Check if a refresh token exists in the database
    $refresh_token_query = "SELECT * FROM token WHERE type='refresh'";
    $refresh_token_result = mysqli_query($cxn, $refresh_token_query);

    // If a refresh token exists, use it to get a new access token
    if ($refresh_token_result != 0) {
        $refresh_token_row = mysqli_fetch_array($refresh_token_result);
        $refresh_token_created = json_decode($refresh_token_row['token'], true)['created'];
        $refresh_token_time_diff = $time_now - $refresh_token_created;

        // If the refresh token has expired, update it
        if ($refresh_token_time_diff > 3600) {
            $client->refreshToken($refresh_token);
            $new_access_token = $client->getAccessToken();

            // Update the refresh token in the database
            $refresh_token_update_query = "UPDATE token SET token='$new_access_token' WHERE type='refresh'";
            mysqli_query($cxn, $refresh_token_update_query);

            // Update the original access token in the database
            $original_access_token_update_query = "UPDATE token SET token='$new_access_token' WHERE type='original'";
            mysqli_query($cxn, $original_access_token_update_query);
        } else {
            // Use the existing refresh token to get a new access token
            $client->refreshToken($refresh_token);
            $new_access_token = $client->getAccessToken();

            // Update the original access token in the database
            $original_access_token_update_query = "UPDATE token SET token='$new_access_token' WHERE type='original'";
            mysqli_query($cxn, $original_access_token_update_query);
        }
    } else {
        // If a refresh token does not exist, retrieve a new one
        $client->refreshToken($refresh_token);
        $new_access_token = $client->getAccessToken();

        // Insert the new refresh token into the database
        $refresh_token_insert_query = "INSERT INTO token (type, token) VALUES ('refresh', '$new_access_token')";
        mysqli_query($cxn, $refresh_token_insert_query);

        // Update the original access token in the database
        $original_access_token_update_query = "UPDATE token SET token='$new_access_token' WHERE type='original'";
        mysqli_query($cxn, $original_access_token_update_query);
    }
}

// Use the new or refreshed access token to make API calls
$service = new Analytics($client);

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