问PHP上传PDF到Google Drive API

EN

  $client->setAccessToken($_SESSION['accessToken']);
    $service = new Google_DriveService($client);
    $finfo = finfo_open(FILEINFO_MIME_TYPE);
    $file = new Google_DriveFile();
    foreach ($files as $file_name) {
        $file_path = 'files/'.$file_name;
        $mime_type = finfo_file($finfo, $file_path);
        $file->setTitle($file_name);
        $file->setDescription('This is a '.$mime_type.' document');
        $file->setMimeType($mime_type);
        $service->files->insert(
            $file,
            array(
                'data' => file_get_contents($file_path),
                'mimeType' => $mime_type
            )
        );
    }
    finfo_close($finfo);

function uploadFile($credentials, $filename, $targetPath)
{

    global $GAPIS;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $GAPIS . 'upload/drive/v2/files?uploadType=media');

    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    //curl_setopt($ch, CURLOPT_POSTFIELDS, array("title" =>"newfile.txt"));
    curl_setopt($ch, CURLOPT_POSTFIELDS, file_get_contents($filename));

    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER,
            array('Content-Type : text/plain', 'Content-Length:' . filesize($filename),
                    'Authorization: Bearer ' . getAccessToken($credentials))
    );

    $postResult = curl_exec($ch);
    curl_close($ch);

    return json_decode($postResult, true);
}

<?php

$GAPIS = 'https://www.googleapis.com/';
$GAPIS_AUTH = $GAPIS . 'auth/';
$GOAUTH = 'https://accounts.google.com/o/oauth2/';

$CLIENT_ID = '709846732498-xxxxxxxx';
$CLIENT_SECRET = 'XXXXXXXXXXXXXX';
$REDIRECT_URI = 'http' . ($_SERVER['SERVER_PORT'] == 80 ? '' : 's') . '://' . $_SERVER['SERVER_NAME'] . $_SERVER['SCRIPT_NAME'];
$SCOPES = array($GAPIS_AUTH . 'drive', $GAPIS_AUTH . 'drive.file', $GAPIS_AUTH . 'userinfo.email', $GAPIS_AUTH . 'userinfo.profile');
$STORE_PATH = 'credentials.json';

function uploadFile($credentials, $filename, $targetPath)
{

    global $GAPIS;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $GAPIS . 'upload/drive/v2/files?uploadType=media');

    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, file_get_contents($filename));
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER,
            array('Content-Type : application/pdf', 'Content-Length:' . filesize($filename),
                    'Authorization: Bearer ' . getAccessToken($credentials))
    );

    $postResult = curl_exec($ch);
    curl_close($ch);

    return json_decode($postResult, true);
}

function getStoredCredentials($path)
{

    $credentials = json_decode(file_get_contents($path), true);

    if (isset($credentials['refresh_token']))
        return $credentials;

    $expire_date = new DateTime();
    $expire_date->setTimestamp($credentials['created']);
    $expire_date->add(new DateInterval('PT' . $credentials['expires_in'] . 'S'));

    $current_time = new DateTime();

    if ($current_time->getTimestamp() >= $expire_date->getTimestamp())
    {
        $credentials = null;
        unlink($path);
    }

    return $credentials;
}

function storeCredentials($path, $credentials)
{

    $credentials['created'] = (new DateTime())->getTimestamp();
    file_put_contents($path, json_encode($credentials));
    return $credentials;
}

function requestAuthCode()
{

    global $GOAUTH, $CLIENT_ID, $REDIRECT_URI, $SCOPES;
    $url = sprintf($GOAUTH . 'auth?scope=%s&redirect_uri=%s&response_type=code&client_id=%s&approval_prompt=force&access_type=offline',
            urlencode(implode(' ', $SCOPES)), urlencode($REDIRECT_URI), urlencode($CLIENT_ID)
    );
    header('Location:' . $url);
}

function requestAccessToken($access_code)
{

    global $GOAUTH, $CLIENT_ID, $CLIENT_SECRET, $REDIRECT_URI;
    $url = $GOAUTH . 'token';
    $post_fields = 'code=' . $access_code . '&client_id=' . urlencode($CLIENT_ID) . '&client_secret=' . urlencode($CLIENT_SECRET)
            . '&redirect_uri=' . urlencode($REDIRECT_URI) . '&grant_type=authorization_code';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
    curl_setopt($ch, CURLOPT_POST, true);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_URL, $url);

    $result = curl_exec($ch);

    curl_close($ch);

    return json_decode($result, true);
}

function getAccessToken($credentials)
{

    $expire_date = new DateTime();
    $expire_date->setTimestamp($credentials['created']);
    $expire_date->add(new DateInterval('PT' . $credentials['expires_in'] . 'S'));

    $current_time = new DateTime();

    if ($current_time->getTimestamp() >= $expire_date->getTimestamp())
        return $credentials['refresh_token'];
    else
        return $credentials['access_token'];

}

function authenticate()
{

    global $STORE_PATH;

    if (file_exists($STORE_PATH))
        $credentials = getStoredCredentials($STORE_PATH);
    else
        $credentials = null;

    if (!(isset($_GET['code']) || isset($credentials)))
        requestAuthCode();

    if (!isset($credentials))
        $credentials = requestAccessToken($_GET['code']);

    if (isset($credentials) && isset($credentials['access_token']) && !file_exists($STORE_PATH))
        $credentials = storeCredentials($STORE_PATH, $credentials);

    return $credentials;
}

$credentials = authenticate();

$result = uploadFile($credentials, 'example.pdf', '');

if (!isset($result['id']))
    throw new Exception(print_r($result));
else
    echo 'File copied successfuly (file Id: ' . $result['id'] . ')';

echo '<pre>'; print_r($result);