检查 Dropbox 应用文件夹是否存在答案

【问题标题】：Check if Dropbox App Folder Exists检查 Dropbox 应用文件夹是否存在
【发布时间】：2016-10-04 06:25:52
【问题描述】：

我正在尝试检查用户何时登录我的仪表板，如果他们有连接的 Dropbox 帐户。我可以做到这一点，但是，我还想检查 App 文件夹 是否存在于 Dropbox 中，否则用户可以开始上传文件并失败，因为路径不存在，因为没有 root。我宁愿在开始时抓住这个，然后在上传过程中。

我尝试使用findErrorNonRoot，但显然不接受根目录。

$pathError = dbx\Path::findErrorNonRoot($dropboxPath);

我也试过isValid

$pathError = dbx\Path::isValid("/");

【问题讨论】：

标签： php api http dropbox

【解决方案1】：

如果用户删除了他们的“App”文件夹，Dropbox API 会抛出 Dropbox\Exception_InvalidAccessToken 异常。所以你应该只正确处理这个异常。例如：

use \Dropbox as dbx;

define ('API_CONF_FILE', '/path/to/api-conf.json');
define ('CLIENT_ID', 'Your Upload App/1.0');

$accessToken = obtain_the_access_token();

$appInfo = dbx\AppInfo::loadFromJsonFile(API_CONF_FILE);

for (;;) {
  echo "Connecting to Dropbox...\n";
  $dbxClient = new dbx\Client($accessToken, CLIENT_ID);

  try {
    // This call will also throw `Dropbox\Exception_InvalidAccessToken`
    //$folderMetadata = $dbxClient->getMetadataWithChildren("/");

    $f = fopen("/path/to/test.txt", "r");
    $result = $dbxClient->uploadFile("/test.txt", dbx\WriteMode::add(), $f);
    fclose($f);
    print_r($result);
    break;
  } catch (Dropbox\Exception_InvalidAccessToken $e) {
    $message = $e->getMessage();
    if ($brace_pos = strpos($message, '{')) {
      $error_title = substr($message, 0, $brace_pos);

      if ($json_error = json_decode(substr($message, $brace_pos), true)) {
        $error_description = $json_error['error'] ?? 'N/A';
      }

      fprintf(STDERR, "Error: %s\nDescription: %s\n",
        $error_title, $error_description ?? 'N/A');

      $webAuth = new dbx\WebAuthNoRedirect($appInfo, CLIENT_ID);
      $authorizeUrl = $webAuth->start();
      echo "1. Go to: $authorizeUrl\n";
      echo "2. Click \"Allow\" (you might have to log in first).\n";
      echo "3. Copy the authorization code.\n";
      $authCode = \trim(\readline("Enter the authorization code here: "));

      list($accessToken, $dropboxUserId) = $webAuth->finish($authCode);
      echo "Access Token: $accessToken\n";
    }
  } catch (Exception $e) {
    fprintf(STDERR, "Unknown exception: %s\n", $e->getMessage());
    exit(1);
  }
}

注意，我使用的是 PHP7 Null coalescing operator。

示例输出（最初删除文件夹时）

Connecting to Dropbox...
Error: HTTP status 401

Description: User has removed their App folder.
1. Go to: https://www.dropbox.com/1/oauth2/authorize?locale=&client_id=2deadbeef2ofaft&response_type=code
2. Click "Allow" (you might have to log in first).
3. Copy the authorization code.
Enter the authorization code here: IugIByIMdKkAAAAAAAAAhVTH02dF7LW70_fFEHHohXo
Access Token: IugIByIMdKkAAAAAAAAAhtPGKSoVOBs557XXrq-zX57L4QRAmqiUTagktS7YDmg1
Connecting to Dropbox...
Array
(
    [revision] => 1
    [bytes] => 10
    [thumb_exists] => 
    [rev] => 14ef8952b
    [modified] => Tue, 04 Oct 2016 09:02:31 +0000
    [mime_type] => text/plain
    [path] => /working-draft.txt
    [is_dir] => 
    [size] => 10 bytes
    [root] => app_folder
    [id] => id:rmvcpq3LHlAAAAAAAAAAAw
    [client_mtime] => Tue, 04 Oct 2016 09:02:31 +0000
    [icon] => page_white_text
)

示例输出（当文件夹最初存在时）

Connecting to Dropbox...
Array
(
    [revision] => 2
    [bytes] => 10
    [thumb_exists] => 
    [rev] => 24ef8b68e
    [modified] => Tue, 04 Oct 2016 09:18:20 +0000
    [mime_type] => text/plain
    [path] => /test.txt
    [is_dir] => 
    [size] => 10 bytes
    [root] => app_folder
    [id] => id:VMaySA3Ug5AAAAAAAAAABA
    [client_mtime] => Tue, 04 Oct 2016 09:18:20 +0000
    [icon] => page_white_text
)

当用户点击链接并单击“允许”按钮时，将创建根 App 文件夹。

【讨论】：