Php 试图从azure blob下载文件，mime类型出现问题

我有以下代码，在按下按钮时通过ajax调用下载文件。奇怪的是，它实际上工作正常，给了我预期的文件，有一段时间，当我再次访问以更改一些命名约定时，mime类型给了我一些问题。当下载时，它告诉我资源被解释为文档，但与应用程序/八位字节流一起传输。这些文件可以是pdf、图像或word文档，我想一种方法是检查扩展名并指定正确的mime类型，但是有没有更通用的方法，或者我可以从八进制流中获取原始文件

try    {
    // Get blob.
    $blob = $blobClient->getBlob($container, $blob_name);
    $properties = $blobClient->getBlobProperties($container, $blob_name);
    $size = $properties->getProperties()->getContentLength();
    $mime = $properties->getProperties()->getContentType();

    header("Content-type: $mime");
    header("Content-length: $size");
    header ("Content-Disposition: attachment; filename=$blob_name");
    fpassthru($blob->getContentStream());

}

您可以使用这些函数获取要下载的文件的mime类型

下面是示例代码片段

<?php

try {
    // Get blob.
    $blob = $blobClient->getBlob($container, $blob_name);
    $properties = $blobClient->getBlobProperties($container, $blob_name);
    $size = $properties->getProperties()->getContentLength();

    $content = stream_get_contents($blob->getContentStream());  
    $finfo = new finfo(FILEINFO_MIME);
    $mime = $finfo->buffer($content);

    header("Content-type: $mime");
    header("Content-length: $size");
    header ("Content-Disposition: inline; filename=$blob_name");

    print_r($content);

} catch(ServiceException $e) {

    $code = $e->getCode();
    $error_message = $e->getMessage();
    echo $code.": ".$error_message."<br />";
}

此外，将文件上载到Azure存储的最佳做法是始终为blob设置内容类型，然后您可以使用上面提供的代码从Azure存储下载具有适当mime类型的文件

下面的代码示例演示了如何将blob上载到内容类型为的容器中：

<?php

require_once 'vendor/autoload.php';

use WindowsAzure\Common\ServicesBuilder;
use MicrosoftAzure\Storage\Blob\Models\CreateBlobOptions;

$connectionString = "DefaultEndpointsProtocol=https;AccountName=$account;AccountKey=$key";

$blobClient = ServicesBuilder::getInstance()->createBlobService($connectionString);

$filetoUpload = realpath('./image.jpg');
$content = fopen($filetoUpload, "r");
$mime = mime_content_type($filetoUpload);
$blob_name = "image.jpg";

try {
    //Upload blob
    $options = new CreateBlobOptions();
    $options->setContentType($mime);
    $blobClient->createBlockBlob("mycontainer", $blob_name, $content, $options);
}
catch(ServiceException $e) {
    $code = $e->getCode();
    $error_message = $e->getMessage();
    echo $code.": ".$error_message."<br />";
}

---

谢谢，上传时添加mime类型就解决了这个问题。非常简单，一开始就不会因为某种原因想到要这么做！
<?php

require_once 'vendor/autoload.php';

use WindowsAzure\Common\ServicesBuilder;
use MicrosoftAzure\Storage\Blob\Models\CreateBlobOptions;

$connectionString = "DefaultEndpointsProtocol=https;AccountName=$account;AccountKey=$key";

$blobClient = ServicesBuilder::getInstance()->createBlobService($connectionString);

$filetoUpload = realpath('./image.jpg');
$content = fopen($filetoUpload, "r");
$mime = mime_content_type($filetoUpload);
$blob_name = "image.jpg";

try {
    //Upload blob
    $options = new CreateBlobOptions();
    $options->setContentType($mime);
    $blobClient->createBlockBlob("mycontainer", $blob_name, $content, $options);
}
catch(ServiceException $e) {
    $code = $e->getCode();
    $error_message = $e->getMessage();
    echo $code.": ".$error_message."<br />";
}