Question

我试图仅在php中限制文件上传到图像，但不允许我上传.psd格式的图像。如何在php中允许. psd文件上传。

现在我正在这样做 <input accept="image/*" type="file" name="image" />

Answer 1

永远不要依赖客户端验证和不信任 $_FILES['upfile']['mime']值!!

您需要检查psd文件的以下mime类型，并根据您的情况进行一些修改：

            'psd' => 'image/psd',
            'psd' => 'image/x-photoshop',
            'psd' => 'application/photoshop',
            'psd' => 'zz-application/zz-winassoc-psd',
            'psd' => 'application/psd'

来自php手册Handling file uploads：

<?php

header('Content-Type: text/plain; charset=utf-8');

try {

    // Undefined | Multiple Files | $_FILES Corruption Attack
    // If this request falls under any of them, treat it invalid.
    if (
        !isset($_FILES['image']['error']) ||
        is_array($_FILES['image']['error'])
    ) {
        throw new RuntimeException('Invalid parameters.');
    }

    // Check $_FILES['image']['error'] value.
    switch ($_FILES['image']['error']) {
        case UPLOAD_ERR_OK:
            break;
        case UPLOAD_ERR_NO_FILE:
            throw new RuntimeException('No file sent.');
        case UPLOAD_ERR_INI_SIZE:
        case UPLOAD_ERR_FORM_SIZE:
            throw new RuntimeException('Exceeded filesize limit.');
        default:
            throw new RuntimeException('Unknown errors.');
    }

    // DO NOT TRUST $_FILES['image']['mime'] VALUE !!
    // Check MIME Type by yourself.
    $finfo = new finfo(FILEINFO_MIME_TYPE);
    if (false === $ext = array_search(
        $finfo->file($_FILES['image']['tmp_name']),
        array(
            'psd' => 'image/psd',
            'psd' => 'image/x-photoshop',
            'psd' => 'application/photoshop',
            'psd' => 'zz-application/zz-winassoc-psd',
            'psd' => 'application/psd'
        ),
        true
    )) {
        throw new RuntimeException('Invalid file format.');
    }

    // You should name it uniquely.
    // DO NOT USE $_FILES['image']['name'] WITHOUT ANY VALIDATION !!
    // On this example, obtain safe unique name from its binary data.
    if (!move_uploaded_file(
        $_FILES['image']['tmp_name'],
        sprintf('./uploads/%s.%s',
            sha1_file($_FILES['image']['tmp_name']),
            $ext
        )
    )) {
        throw new RuntimeException('Failed to move uploaded file.');
    }

    echo 'File is uploaded successfully.';

} catch (RuntimeException $e) {

    echo $e->getMessage();

}

?>

如何在php文件上传中仅上传.psd

1 个答案: