无法在C#中提取MTOM/XOP附件

Question

我仍然无法提取MIME附件。请检查下面的MIME消息。这是我们从服务处收到的。

--MIMEBoundary_199ca6b7114b9acca5deb2047d25d5841d4afb7f68281379
Content-Type: application/xop+xml; charset=utf-8; type="text/xml"
Content-Transfer-Encoding: binary
Content-ID: <0.099ca6b7114b9acca5deb2047d25d5841d4afb7f68281379@apache.org>

<?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Header><StateHeader xmlns="http://www.statemef.com/StateGatewayService"><MessageID>12345201704200009962</MessageID><RelatesTo>12345201704200009962</RelatesTo><Action>GetNewAcks</Action><Timestamp>2017-02-11T01:54:51.676-05:00</Timestamp><TestIndicator>T</TestIndicator></StateHeader></soapenv:Header><soapenv:Body><GetNewAcksResponse xmlns="http://www.statemef.com/StateGatewayService"><MoreAvailable>true</MoreAvailable><AcknowledgementListAttachmentMTOM><xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:299ca6b7114b9acca5deb2047d25d5841d4afb7f68281379@apache.org"></xop:Include></AcknowledgementListAttachmentMTOM></GetNewAcksResponse></soapenv:Body></soapenv:Envelope>
--MIMEBoundary_199ca6b7114b9acca5deb2047d25d5841d4afb7f68281379
Content-Type: application/octet-stream
Content-Transfer-Encoding: binary
Content-ID: <299ca6b7114b9acca5deb2047d25d5841d4afb7f68281379@apache.org>

Answer 1

步骤1:获取完整的MIME流，即定义boundary参数为MIMEBoundary_199ca6b7114b9acca5deb2047d25d5841d4afb7f68281379的Content-Type头部。没有这个，你就是索尔。

如果您使用的是HttpWebRequest之类的工具，请继续执行步骤2。

第2步:按照MimeKit FAQ中的说明进行操作

如何从HTTP web请求中解析多部分/表单数据？

由于像HttpWebResponse这样的类负责解析header(包括Content-Type header)，并且只提供一个内容流供消费，因此MimeKit在MimeEntity上使用以下两个静态方法提供了一种方法来处理此问题

public static MimeEntity Load (ParserOptions options, ContentType contentType, Stream content, CancellationToken cancellationToken = default (CancellationToken));

public static MimeEntity Load (ContentType contentType, Stream content, CancellationToken cancellationToken = default (CancellationToken));

下面是如何使用这些方法：

MimeEntity ParseMultipartFormData (HttpWebResponse response)
{
    var contentType = ContentType.Parse (response.ContentType);

    return MimeEntity.Load (contentType, response.GetResponseStream ());
}

一旦有了MimeEntity，就可以将其转换为Multipart并枚举其中的附件，将内容保存到流中，如下所示：

int i = 1;
foreach (var attachment in multipart.OfType<MimePart> ()) {
    string fileName = string.Format ("attachment.{0}.dat", i++);
    using (var stream = File.Create (fileName))
        attachment.ContentObject.DecodeTo (stream);
}

Answer 2

该问题仅显示响应正文。要解析它，您应该预先考虑响应头。

例如，它应该如下所示：

MIME-Version: 1.0 
content-type: multipart/related; type="application/xop+xml";start="<http://tempuri.org/0>";boundary="MIMEBoundary_someuniqueID";start-info="text/xml"
Server: Microsoft-IIS/10.0 
X-Powered-By: ASP.NET 
Content-Length:24371900


--MIMEBoundary_someuniqueID
Content-Type: application/xop+xml; charset=utf-8; type="text/xml" Content-Transfer-Encoding: binary
Content-ID: <http://tempuri.org/0>

<soap:Envelope> 
    <someWrapperElt>
        <xop:Include href="cid:uri_of_content"></xop:Include>
    </someWrapperElt>
</soap:Envelope>
--MIMEBoundary_someuniqueID
Content-Type: application/octet-stream 
Content-Transfer-Encoding: binary 
Content-ID: <uri_of_content>

...start.b1n@ry-content-here-etc.fckZ8990832d...
--MIMEBoundary_someuniqueID--

然后将整个响应转换为MemoryStream对象，并使用XmlDictionaryReader对其进行解析。

XmlDictionaryReader mtomReader = XmlDictionaryReader.CreateMtomReader(ms, Encoding.UTF8, XmlDictionaryReaderQuotas.Max);

也就是说，您现在可以从mtomReader对象中提取所需的值，包括附件。

Answer 3

您可以在Github WebResponseDerializer组件中使用解析器项目来解析多部分soap消息

1)将soap body标签之间的xml消息复制到xml2charp站点，取反序列化对象。

2)获取响应流并调用，如下所示。

 Byte[] file = File.ReadAllBytes("..\\..\\Data\\ccc.xxx");
        Stream stream = new MemoryStream(file);
        WebResponseDerializer<SIGetImageResponse> deserilizer = new WebResponseDerializer<SIGetImageResponse>(stream);
        SIGetImageResponse ddd = deserilizer.GetData();
        foreach (var item in ddd.ResponseData.AttachmentDescriptor.Attachment)
        {
            String contentId = "<<" + item.ImageData.Include.Href + ">>";
            contentId = contentId.Replace("%40", "@").Replace("cid:", "");
            item.ImageData.Include.XopData = deserilizer.GetAttachment(contentId);
        }