如何为创建Bearer令牌

Question

要将对象上传到google云存储桶，我需要一个身份验证令牌。我选择了JSON方法将对象上传到桶中。

<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,  "https://www.googleapis.com/upload/storage/v1/b/Mybucket/o?uploadType=media");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "yourdata");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$headers = array();
$headers[] = "Authorization:Bearer <TOKEN>";
$headers[] = "x-goog-project-id: xxxxxxxxxxx";
$headers[] = "x-goog-user-project: xxxxxxxxxxx";
$headers[] = "Content-Length: 8";
$headers[] = "Content-Type: image/jpeg";
$headers[] = "x-goog-acl: public-read-write";
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$result = curl_exec($ch);
if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
}
curl_close ($ch);
?>

1. 在没有这些类型的身份验证或任何其他身份验证方法的情况下，有什么方法可以上传对象吗？
2. 如何使用api/curl/php以编程方式生成此令牌(承载)？

Answer 1

function getOAuthToken(){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
    $headers = array();
    $headers[] = "Metadata-Flavor: Google";
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    $result = curl_exec($ch);
    if (curl_errno($ch)) {
      //  echo 'Error:' . curl_error($ch);
    }
    curl_close ($ch);
    $result = json_decode($result,true);
    return $result['access_token'];
}

$result‘’access_ token‘是承载令牌。