How can I upload files to GoogleDrive in "multipart" type by using php-curl?

Question

I want to upload in using php curl other than google-api-php-client, but I really don't know how to do it, here is the documentation:Send a multipart upload request

Here is my code snippet, I stuck in CURLOPT_POSTFIELDS, can anybody help me with this?

public function uploadByCurl($uploadFilePath, $accessToken){
    $ch = curl_init();
    $mimeType = $this->getMimeType($uploadFilePath);
    $options = [
        CURLOPT_URL =>  'https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart',
        CURLOPT_POST => true,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POSTFIELDS => [
            'file' => new \CURLFile($uploadFilePath),
            // 'name' =>
        ],
        CURLOPT_HTTPHEADER => [
            'Authorization:Bearer ' . $accessToken,
            'Content-Type:' . $mimeType,
            'Content-Length:' . filesize($uploadFilePath),
        ],
        //In case you're in Windows, sometimes will throw error if not set SSL verification to false
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => 0,
    ];
    //In case you need a proxy
    //$options[CURLOPT_PROXY] = 'http://127.0.0.1:1087';

    curl_setopt_array($ch, $options);
    $result = curl_exec($ch);
    if (curl_errno($ch)) {
        echo 'Error:' . curl_error($ch);
    }
    curl_close ($ch);
    return $result;
}

I just don't know how to translate this to code(not familiar with multipart/related):

Metadata part. Must come first, and must have a Content-Type header set to application/json; charset=UTF-8. Add the file's metadata to this part in JSON format.
Media part. Must come second, and must have a Content-Type header, which may have any MIME type. Add the file's data to this part.

Refer to this: [How can I upload files to GoogleDrive in “multipart” type by using Guzzle?](https://stackoverflow.com/questions/60837047/how-can-i-upload-files-to-googledrive-in-multipart-type-by-using-guzzle) — Willis, Mar 25 '20 at 01:39

score 6 · Accepted Answer · edited Feb 10 '23 at 18:27

You want to upload a file using multipart/ralated with Drive API v3.
You want to achieve this using PHP CURL.
Your access token can be used for uploading the file to Google Drive.

If my understanding is correct, how about this answer?

Modification points:

In this case, I would like to propose to create the structure including the file and the metadata for multipart/ralated and request it.

Modified script:

When your script is modified, it becomes as follows.

public function uploadByCurl($uploadFilePath, $accessToken){
    $handle = fopen($uploadFilePath, "rb");
    $file = fread($handle, filesize($uploadFilePath));
    fclose($handle);

    $boundary = "xxxxxxxxxx";
    $data = "--" . $boundary . "\r\n";
    $data .= "Content-Type: application/json; charset=UTF-8\r\n\r\n";
    $data .= "{\"name\": \"" . basename($uploadFilePath) . "\", \"mimeType\": \"" . mime_content_type($uploadFilePath) . "\"}\r\n";
    $data .= "--" . $boundary . "\r\n";
    $data .= "Content-Transfer-Encoding: base64\r\n\r\n";
    $data .= base64_encode($file);
    $data .= "\r\n--" . $boundary . "--";

    $ch = curl_init();
    $options = [
        CURLOPT_URL =>  'https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart',
        CURLOPT_POST => true,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POSTFIELDS => $data,
        CURLOPT_HTTPHEADER => [
            'Authorization:Bearer ' . $accessToken,
            'Content-Type:multipart/related; boundary=' . $boundary,
        ],
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => 0,
    ];
    curl_setopt_array($ch, $options);
    $result = curl_exec($ch);
    if (curl_errno($ch)) {
        echo 'Error:' . curl_error($ch);
    }
    curl_close ($ch);
    return $result;
}

At this modified script, the filename and mimeType are retrieved from $uploadFilePath.

Note:

Multipart upload can upload files less than 5 MB size. Please be careful this.

References:

Perform a multipart upload

Multipart upload: uploadType=multipart. For quick transfer of a small file (5 MB or less) and metadata that describes the file, all in a single request.

Actually I almost figure it out after I post this question several hours, but I really appreciate, you help me a lot, now I know how **boundary** works and how data actually transfer in "POST" method, if I use `google-api-php-client`, I won't learn this, this is one of the reason why I'm not using the `google-api-php-client`. Thank you so much! — Willis, Mar 24 '20 at 05:07
@Bruce Xie Thank you for replying. I agree with your direction. Also at first, I created some applications without using the official goolgeapis. By this, when I actually used the googleapis, I could understand more about the googleapis. — Tanaike, Mar 24 '20 at 05:12
@anaike Thank you! I also notice that we don't have to set the `Content-Length` header cause the curl tool will do it automatically. Another point is that `fopen()`, `fread()` and `fclose()` can be replaced with `file_get_contents()`. — Willis, Mar 24 '20 at 05:39
@anaike I found we can't use `base_encode()`, otherwise if you upload image, you can't preview it. — Willis, Mar 24 '20 at 06:32
@Bruce Xie Thank you for replying. In my environment, when the image file is uploaded using this modified script, I could confirm that the script worked and the image can be correctly shown. So I proposed this modification. But if in your environment, it cannot be used, I have to apologize for this. — Tanaike, Mar 24 '20 at 06:35
Oh, I know why, I miss this line: `$data .= "Content-Transfer-Encoding: base64\r\n\r\n";` — Willis, Mar 24 '20 at 06:39

How can I upload files to GoogleDrive in "multipart" type by using php-curl?

1 Answers1

Modification points:

Modified script:

Note:

References:

Linked