Google Drive API v3 - 使用PHP下载文件 [英] Google Drive API v3 - downloading files in PHP

问题描述

我正在尝试使用PHP了解Google Drive API v3的下载流程。使用API​​ v2下载文件我：

• 获取文件元数据


• 使用downloadUrl参数以获得文件的直接链接，附加一个oAuth标记并向其发出GET请求。
使用API​​ v3这似乎已被弃用，根据文档，您可以致电 files-> get（），数组参数为alt=> media来获取文件本身而不是元​​数据。




他们的例子是：

  $ fileId ='0BwwA4oUTeiV1UVNwOHItT0xfa2M'; 
 $ content = $ driveService-> files-> get（$ fileId，array（
'alt'=>'media'））; 
  

我很难理解它是如何工作的，并且通过代码遍历它，但它没有提供更多信息。





当您调用 get（）时，实际进入 $ content 在这个例子中？它是文件的内容（在处理大文件时这似乎很麻烦 - 当然你会失去内存？！）还是某种类型的流引用，我可以调用 fopen on？我怎么把这个文件保存到磁盘？





文档没有详细说明你做这个API调用会发生什么，它只是说它执行文件下载？

解决方案





当您使用文档中指定的 alt => media 参数调用 get（）方法时您将获得底层的HTTP响应，这是一个 Guzzle响应对象（显然客户端库使用Guzzle作为底层传输）。



从那里你可以调用任何Guzzle响应方法，比如 $ response-> getStatusCode（），或者你可以获得实际文件内容的流。





如果他们在某处记录了这些内容，会有帮助！





编辑：这是一个粗略的例子，如果其他人被卡住如何保存文件。

 <？php 
 
 date_default_timezone_set（Europe / London）; 
 require_once'vendor / autoload.php'; 
 
 //我正在使用一个服务帐户，为您的帐户类型使用任何Google认证流程。 
 
 putenv（'GOOGLE_APPLICATION_CREDENTIALS = / path / to / service / account / key.json'）; 
 $ client = new Google_Client（）; 
 $ client-> addScope（Google_Service_Drive :: DRIVE）; 
 $ client-> useApplicationDefaultCredentials（）; 
 
 $ service = new Google_Service_Drive（$ client）; 
 
 $ fileId =0Bxxxxxxxxxxxxxxxxxxxx; // Google File ID 
 $ content = $ service-> files-> get（$ fileId，array（alt=>media））; 
 
 //打开输出文件句柄。 
 
 $ outHandle = fopen（/ path / to / destination，w +）; 
 
 //在我们到达EOF之前，一次读取1024个字节并写入输出文件句柄。 （$！$ content-> getBody（） - > eof（））{
 fwrite（$ outHandle，$ content-> getBody（） - > read（1024 ））; 
} 
 
 //关闭输出文件句柄。 
 
 fclose（$ outHandle）; 
 echoDone.\\\

 
？> 
  




I'm trying to understand the download flow for the Google Drive API v3 using PHP. Using the API v2 to download a file I:

• Got the file metadata
• Used the downloadUrl parameter to get a direct link to the file, attached an oAuth token to it and made a GET request to that.

Using API v3 this appears to have been deprecated, and according to the docs you call files->get() on the Drive Service with an array parameter of "alt" => "media" to get the file itself rather than the metadata.

And their example was:

$fileId = '0BwwA4oUTeiV1UVNwOHItT0xfa2M';
$content = $driveService->files->get($fileId, array(
'alt' => 'media' ));

I'm having trouble understanding how this works though and have trawled through the code but it didn't give much more info.

When you call get(), what actually goes into $content in the example? Is it the contents of the file (in which case this seems troublesome when dealing with large files - surely you'll get out of memory?!) or is it some type of stream reference that I can call fopen on? How would I save this file to disk?

The documentation doesn't really go into any detail about what happens when you make that API call, it just says it performs a file download?

解决方案

I figured it out after a bit of experimenting.

When you call the get() method with the alt=>media parameter as specified in the docs you get the underlying HTTP response which is a Guzzle response object (as apparently the client library uses Guzzle for it's underlying transport).

From there you can call any Guzzle response method such as $response->getStatusCode() or you can get a stream of the actual file content.

Would have been helpful if they had documented this somewhere!

EDIT: Here's a rough example if anyone else gets stuck of how to save a file.

<?php

date_default_timezone_set("Europe/London");
require_once 'vendor/autoload.php';

// I'm using a service account, use whatever Google auth flow for your type of account.

putenv('GOOGLE_APPLICATION_CREDENTIALS=/path/to/service/account/key.json');
$client = new Google_Client();
$client->addScope(Google_Service_Drive::DRIVE);
$client->useApplicationDefaultCredentials();

$service = new Google_Service_Drive($client);

$fileId = "0Bxxxxxxxxxxxxxxxxxxxx"; // Google File ID
$content = $service->files->get($fileId, array("alt" => "media"));

// Open file handle for output.

$outHandle = fopen("/path/to/destination", "w+");

// Until we have reached the EOF, read 1024 bytes at a time and write to the output file handle.

while (!$content->getBody()->eof()) {
        fwrite($outHandle, $content->getBody()->read(1024));
}

// Close output file handle.

fclose($outHandle);
echo "Done.\n"

?>

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