Question

在我们的项目中，我们需要通过代理服务器（squid）访问Blob存储。

我们计划使用Microsoft Azure Storage SDK for Java version 2.2.0。但看起来API并未提供设置代理。我可以让它通过代理的唯一方法是设置系统属性

System.setProperty("http.proxyHost", "127.0.0.1");
System.setProperty("http.proxyPort", "3128");

但这会影响我的JVM上运行的所有服务，这会损害其他不应通过代理服务器的服务。

查看它看起来的java代码 com.microsoft.azure.storage.core.BaseRequest.createURLConnection（URI，RequestOptions，UriQueryBuilder，OperationContext）。在没有代理的情况下调用java.net.URL.openConnection（）。使用java.net.URL.openConnection（Proxy）可以提供所需的支持吗？

我觉得这不支持吗？我在这里想念一下吗？

更新：我在azure-storage-java git中打开了issue，我很乐意得到您的输入，因为我想建议一个拉取请求。< / p>

Answer 1

到目前为止，还没有Java SDK API支持通过代理服务器直接访问Azure存储，因为BaseRequest类在函数“public static HttpConnection createURLConnection（...）”中错过了“url.openConnection（proxy）”。

根据我的经验，有两种方法可以帮助您实现访问功能。

一个是您可以通过java.net.Proxy类使用Azure存储REST API来访问存储服务。

Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(host, port));
URLConnection conn = url.openConnection(proxy);
And if you should be authorize proxy user & password, you can do it as the follows:
//Proxy-Authorization: Basic <Base64.encode(user:password)>
String headerKey = "Proxy-Authorization";
String headerValue = "Basic " + Base64.encode(user+":"+password);
conn.setRequestProperty(headerKey, headerValue);

最后一个是您可以修改Azure SDK API， 覆盖Class“BaseRequest” 中的方法“createURLConnection”以实现访问。 GitHub上的Azure Storage SDK v2.2.0项目为https://github.com/Azure/azure-storage-java/tree/v2.2.0/。

注意：

public static HttpURLConnection createURLConnection（final URI uri，final RequestOptions options，UriQueryBuilder builder，final OperationContext opContext， java.net.Proxy proxy ）

和

final HttpURLConnection retConnection =（HttpURLConnection）resourceUrl.openConnection（ proxy ）;

public static HttpURLConnection createURLConnection(final URI uri, final RequestOptions options, UriQueryBuilder builder, final OperationContext opContext, java.net.Proxy proxy) throws IOException, URISyntaxException, StorageException {
    if (builder == null) {
        builder = new UriQueryBuilder();
    }

    final URL resourceUrl = builder.addToURI(uri).toURL();

    final HttpURLConnection retConnection = (HttpURLConnection) resourceUrl.openConnection(proxy);

    if (options.getTimeoutIntervalInMs() != null && options.getTimeoutIntervalInMs() != 0) {
        builder.add(TIMEOUT, String.valueOf(options.getTimeoutIntervalInMs() / 1000));
    }

    // Note: ReadTimeout must be explicitly set to avoid a bug in JDK 6.
    // In certain cases, this bug causes an immediate read timeout exception to be thrown even if ReadTimeout is not set.
    retConnection.setReadTimeout(Utility.getRemainingTimeout(options.getOperationExpiryTimeInMs(), options.getTimeoutIntervalInMs()));

    // Note : accept behavior, java by default sends Accept behavior as text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
    retConnection.setRequestProperty(Constants.HeaderConstants.ACCEPT, Constants.HeaderConstants.XML_TYPE);
    retConnection.setRequestProperty(Constants.HeaderConstants.ACCEPT_CHARSET, Constants.UTF8_CHARSET);

    // Note : Content-Type behavior, java by default sends Content-type behavior as application/x-www-form-urlencoded for posts.
    retConnection.setRequestProperty(Constants.HeaderConstants.CONTENT_TYPE, Constants.EMPTY_STRING);

    retConnection.setRequestProperty(Constants.HeaderConstants.STORAGE_VERSION_HEADER,
        Constants.HeaderConstants.TARGET_STORAGE_VERSION);
    retConnection.setRequestProperty(Constants.HeaderConstants.USER_AGENT, getUserAgent());
    retConnection.setRequestProperty(Constants.HeaderConstants.CLIENT_REQUEST_ID_HEADER,
        opContext.getClientRequestID());

    return retConnection;
}

顺便说一下，你需要在每个CloudXXXClient（CloudBlobClient等）类中调用上面的方法。

Answer 2

根据此问题以及由strazh issue-48打开的其他问题，由我打开issue-65后，代理支持在版本4.2.0中进行了改进，请参阅here。

添加了对设置库范围代理的支持。默认代理可以在OperationContext上设置。

有关完整示例，请参阅JUnits https://github.com/Azure/azure-storage-java/blob/master/microsoft-azure-storage-test/src/com/microsoft/azure/storage/GenericTests.java

查找testDefaultProxy和testProxy

Answer 3

Azure存储团队已经发布了一个新的SDK（v10），现在通过HttpPipeline支持该代理。您可以通过将管道传递给StorageURL来在所有操作中共享管道，也可以通过将其传递给BlobURL对象在单个Blob中使用。

AnonymousCredentials creds = new AnonymousCredentials();

// Use PipelineOptions to define a retry strategy and a proxy - you can also pass your own HttpClient to this if you like
PipelineOptions po = new PipelineOptions();

// Proxy configuration shown here as a sample
HttpClientConfiguration configuration = new HttpClientConfiguration(
      new Proxy(Proxy.Type.HTTP, new InetSocketAddress("localhost", 8888)), false); //pass true if the Proxy endpoint is HTTPS
po.client = HttpClient.createDefault(configuration);


// Create a URI with SAS token, and pass it to the PageBlobURL with an HttpPipeline created by createPipeline method
URL u = new URL("https://myaccount.blob.core.windows.net/mycontainer/myfile?sv=2017-04-17&sr=b&si=14169767-6354-41ed-a99b-c9db8dcc66bc&sig=8NUr%2BSpmRH%2BB2z%2FpQZDPDquTQ7rbgWfE9a6AePLlFT0%3D");
PageBlobURL blobURL = new PageBlobURL(u, PageBlobURL.createPipeline(creds, po));

通过代理服务器连接到Azure存储帐户Microsoft Azure Storage SDK for Java

3 个答案: