php curl无法与Dropbox Oauth一起工作，返回“无效请求”

Question

Dropbox文档说要进行身份验证您必须执行以下操作：

curl https://api.dropbox.com/oauth2/token \
    -d code=<AUTHORIZATION_CODE> \
    -d grant_type=authorization_code \
    -d redirect_uri=<REDIRECT_URI> \
    -u <APP_KEY>:<APP_SECRET>

这是我对PHP的尝试，但是在错误之后返回dropbox 无效请求 - 请求参数与任何支持的授权流不匹配

$url = "https://api.dropbox.com/oauth2/token";
            $redirect_uri = 'https://www.mywebsite.com/oauth_dropbox';
           
            $postfields = array(
                'code' => $_GET['code'],
                'grant_type' => 'authorization_code',
                'redirect_uri' => $redirect_uri
            );

            $auth = "$app_key:$app_secret";
            $curl = curl_init($url);

            curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
            curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($postfields));
            curl_setopt($curl, CURLOPT_USERPWD, $auth);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

            $json_response = curl_exec($curl);
            $responseObj = json_decode($json_response);

我如何求解？

Answer 1

如果您明确设置基本授权，那就可以做到这一点，也就是说：

curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);

设置以下操作：

curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);

Answer 2

您当前的curl发送GET请求（这就是外部API看不到发送的任何参数的原因），但您正在添加内容，因为它是POST请求。也添加CURLOPT_POST。

$url = "https://api.dropbox.com/oauth2/token";
$redirect_uri = 'https://www.mywebsite.com/oauth_dropbox';
           
$postfields = [
    'code' => $_GET['code'],
    'grant_type' => 'authorization_code',
    'redirect_uri' => $redirect_uri
];

$auth = "$app_key:$app_secret";
$curl = curl_init($url);

curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($postfields));
curl_setopt($curl, CURLOPT_USERPWD, $auth);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

$json_response = curl_exec($curl);
$responseObj = json_decode($json_response);