Monday, March 2, 2015

SOAP With Attachments Client

In the enterprise world developing simple SOAP based web services are not enough and they have to deal with binary data like Imgae, PDF, Word, Xls and other documents. We will see simple SOAP client for streaming binary data.


Base64 Problem
The most popular way of sending the binary attachments to SOAP service is to encode the content as Base64. This method may well work for smaller size of attachments as the Base64 encoding is memory intensive operation. The entire content needs to loaded into memory and encoded using Base64. The encoded data needs to embedded within the SOAP body XML.

Also the encoded data size is roughly 37% more than the raw binary data. To make it work for large files you need to upgrade your JVM memory.

Streaming of Attachments (SOAP with attachments)
The memory intensive operation can be avoided using SOAP with attachments. The idea of SOAP with attachments is sames attaching the document to email. The SOAP Body contains only the reference to the binary file and binary file will be streamed outside of SOAP Envelope.

The following example shows the SOAP message and the attachments. This example is for Oracle UCM's CheckInUniversal operation. 

The SOAP message package is constructed using the Multipart/Related media type. The rules for the construction of SOAP message packages are as follows:
  1. The primary SOAP message must be carried in the root body part of the Multipart/Related structure. Consequently the type parameter of the Multipart/Related media header will always equal the Content-Type header for the primary SOAP 1.1 message, i.e., text/xml.
  2. Referenced MIME parts must contain either a Content-ID MIME header.
Content-Type: multipart/related; type="text/xml"; start="<test@example.com>"; boundary="----=_Part_12_21424854.1424891476173"
SOAPAction: "http://www.stellent.com/CheckIn/"
Content-Length: 1818


------=_Part_12_21424854.1424891476173
Content-Type: text/xml; charset=UTF-8
Content-Transfer-Encoding: 8bit
Content-ID: <test@example.com>

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:chec="http://www.stellent.com/CheckIn/">
   <soapenv:Header/>
   <soapenv:Body>
      <chec:CheckInUniversal>
         <chec:dDocName/>
         <chec:dDocTitle>TestStreaming-large</chec:dDocTitle>
         <chec:dDocType>Records</chec:dDocType>
         <chec:dDocAuthor>username</chec:dDocAuthor>
         <chec:dSecurityGroup>group</chec:dSecurityGroup>
         <chec:dDocAccount/>
         <chec:CustomDocMetaData>
            <chec:property>
               <chec:name>xLibrary</chec:name>
               <chec:value>library</chec:value>
            </chec:property>
            <chec:property>
               <chec:name>xesd_proj_name</chec:name>
               <chec:value>Test</chec:value>
            </chec:property>            
         </chec:CustomDocMetaData>
         <chec:primaryFile>
            <chec:fileName>TestUCM-large</chec:fileName>
         </chec:primaryFile>
      </chec:CheckInUniversal>
   </soapenv:Body>
</soapenv:Envelope>
------=_Part_12_21424854.1424891476173
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Content-ID: <primaryFile>

Hello
------=_Part_12_21424854.1424891476173--


The oracle UCM service expects the Content-ID of the attachment to be 'primaryFile' SOAP Part. The attachment file content is "Hello"

UploadStream Client
   1 
import java.io.File;
   2 
import java.io.IOException;
   3 
import java.util.Properties;
   4 
 
   5 
import javax.activation.DataHandler;
   6 
import javax.mail.Session;
   7 
import javax.mail.internet.MimeBodyPart;
   8 
import javax.mail.internet.MimeMessage;
   9 
import javax.mail.internet.MimeMultipart;
  10 
import javax.mail.internet.PreencodedMimeBodyPart;
  11 
 
  12 
import org.apache.commons.httpclient.Header;
  13 
import org.apache.commons.httpclient.HttpClient;
  14 
import org.apache.commons.httpclient.HttpException;
  15 
import org.apache.commons.httpclient.methods.PostMethod;
  16 
 
  17 
 
  18 
public class UploadStream {
  19 
        public static void main(String[] args) {
  20 
                String fileBaseName = "JDebug";
  21 
                String fileExtn = ".zip";
  22 
               
  23 
                for (int i=1; i<=1; i++) {
  24 
                        Upload uploadThread = new Upload("Thread-" + i, fileBaseName + i + fileExtn);
  25 
                        uploadThread.start();
  26 
                }
  27 
        }
  28 
       
  29 
        private static class Upload extends Thread {
  30 
                String name;
  31 
                String fileName;
  32 
                public Upload(String name, String fileName) {
  33 
                        super(name);
  34 
                        this.name = name;
  35 
                        this.fileName = fileName;
  36 
                }
  37 
               
  38 
                public void run() {
  39 
                        System.out.println("Thread["+ this.name +"] Started; Uploading " + "c:\\temp\\" + this.fileName);
  40 
                       
  41 
                        HttpClient client = new HttpClient();
  42 
                        PostMethod method = new PostMethod(
  43 
                                        "http://www.oracle.com:16200/_dav/cs/idcplg");
  44 
                        long start = System.currentTimeMillis();
  45 
                       
  46 
                        try {
  47 
                                                       
  48 
                                method.addRequestHeader("SOAPAction",
  49 
                                                "\"http://www.stellent.com/CheckIn/\"");
  50 
               
  51 
                                MimeMessage message = new MimeMessage(Session.getDefaultInstance( new Properties() ));
  52 
                                MimeMultipart mp = new MimeMultipart();
  53 
                               
  54 
                                // Create the first body part
  55 
                                StringBuffer requestXML = constructRequest(this.fileName);
  56 
                                long requestSize = requestXML.length();
  57 
                                MimeBodyPart rootPart = new PreencodedMimeBodyPart("8bit");
  58 
                                rootPart.setContentID("<test@example.com>");                       
  59 
                                rootPart.setDataHandler(new DataHandler(new RequestXmlDataSource(requestXML.toString())));
  60 
                               
  61 
                                mp.addBodyPart(rootPart, 0);
  62 
                               
  63 
                                File f = new File("c:\\temp\\" + this.fileName);
  64 
                                long attachmentSize = f.length();
  65 
                               
  66 
                                MimeBodyPart attachmentPart = new PreencodedMimeBodyPart("binary");
  67 
                                attachmentPart.setContentID("<primaryFile>");
  68 
                                attachmentPart.setDataHandler(new DataHandler( new AttachmentDataSource("c:\\temp\\" + this.fileName)));
  69 
                                mp.addBodyPart(attachmentPart);
  70 
                               
  71 
                                message.setContent(mp);
  72 
                                message.saveChanges();
  73 
                                                       
  74 
                               
  75 
                                String cType = message.getHeader("Content-Type")[0];
  76 
                                int idx = cType.indexOf("boundary");
  77 
                                int boundryLength = 0;
  78 
                                if (idx != -1) {
  79 
                                        boundryLength = cType.substring(idx+9).length();
  80 
                                }
  81 
                                                       
  82 
                                long contentLength = (boundryLength*3) +2 + requestSize + attachmentSize + 94 + 103 + 28;
  83 
                               
  84 
                                MimeMessageRequestEntity mimeMessageRequestEntity = new MimeMessageRequestEntity(
  85 
                                                message, contentLength);
  86 
                               
  87 
                                method.setDoAuthentication(true);
  88 
                                method.setRequestEntity(mimeMessageRequestEntity);
  89 
                               
  90 
 
  91 
                                method.addRequestHeader("Content-Length", String.valueOf(contentLength));
  92 
                                method.addRequestHeader("Content-Type", mimeMessageRequestEntity.getContentType());
  93 
                                method.getParams().setParameter("http.socket.timeout", new Integer(0));
  94 
                               
  95 
                                // execute the GET
  96 
                                int status = client.executeMethod(method);
  97 
                               
  98 
                                for(Header header : method.getRequestHeaders()) {
  99 
                                        System.out.println(header.getName() +": " + header.getValue());
 100 
                                }
 101 
                               
 102 
                                System.out
 103 
                                                .println(status + "\n" + method.getResponseBodyAsString());
 104 
 
 105 
                        } catch (HttpException e) {
 106 
                                System.out.println("Exception in Thread["+ this.name +"]");
 107 
                                e.printStackTrace();
 108 
                        } catch (IOException e) {
 109 
                                System.out.println("Exception in Thread["+ this.name +"]");
 110 
                                e.printStackTrace();
 111 
                        } catch (Exception e) {
 112 
                                System.out.println("Exception in Thread["+ this.name +"]");
 113 
                                e.printStackTrace();
 114 
                        } finally {
 115 
                                long end = System.currentTimeMillis();
 116 
                                System.out.println("Time taken by thread["+ this.name +"]: "+ (end-start));
 117 
                                // release any connection resources used by the method
 118 
                                method.releaseConnection();
 119 
                        }
 120 
                }
 121 
               
 122 
                public StringBuffer constructRequest(String fileName) {
 123 
                        StringBuffer request = new StringBuffer();
 124 
                        request.append("<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:chec=\"http://www.stellent.com/CheckIn/\">\r\n" +
 125 
                                        "   <soapenv:Header/>" +
 126 
                                        "   <soapenv:Body>\r\n" +
 127 
                                        "      <chec:CheckInUniversal>\r\n" +
 128 
                                        "         <chec:dDocName/>\r\n" +
 129 
                                        "         <chec:dDocTitle>" + fileName +"</chec:dDocTitle>\r\n" +
 130 
                                        "         <chec:dDocType>Records</chec:dDocType>\r\n" +
 131 
                                        "         <chec:dDocAuthor>username</chec:dDocAuthor>\r\n" +
 132 
                                        "         <chec:dSecurityGroup>group</chec:dSecurityGroup>\r\n" +
 133 
                                        "         <chec:dDocAccount/>\r\n" +
 134 
                                        "         <chec:CustomDocMetaData>\r\n" +
 135 
                                        "            <chec:property>\r\n" +
 136 
                                        "               <chec:name>xLibrary</chec:name>\r\n" +
 137 
                                        "               <chec:value>Library</chec:value>\r\n" +
 138 
                                        "            </chec:property>\r\n" +
 139 
                                        "             <chec:property>\r\n" +
 140 
                                        "               <chec:name>xesd_proj_name</chec:name>\r\n" +
 141 
                                        "               <chec:value>Test</chec:value>\r\n" +
 142 
                                        "            </chec:property>            \r\n" +
 143 
                                        "         </chec:CustomDocMetaData>\r\n" +
 144 
                                        "         <chec:primaryFile>\r\n" +
 145 
                                        "            <chec:fileName>" + fileName +"</chec:fileName>\r\n" +
 146 
                                        "         </chec:primaryFile>\r\n" +
 147 
                                        "      </chec:CheckInUniversal>\r\n" +
 148 
                                        "   </soapenv:Body>\r\n" +
 149 
                                        "</soapenv:Envelope>");
 150 
                       
 151 
                        return request;
 152 
                }
 153 
        }
 154 
}

MimeMessageRequestEntity.java
  1 
import java.io.ByteArrayOutputStream;
  2 
import java.io.IOException;
  3 
import java.io.OutputStream;
  4 
 
  5 
import javax.mail.MessagingException;
  6 
import javax.mail.internet.MimeMessage;
  7 
import javax.mail.internet.MimeMultipart;
  8 
 
  9 
import org.apache.commons.httpclient.methods.RequestEntity;
 10 
 
 11 
public class MimeMessageRequestEntity implements RequestEntity {
 12 
        private final MimeMessage message;
 13 
        private byte[] buffer;
 14 
        private long contentLength = 0;
 15 
 
 16 
        public MimeMessageRequestEntity(MimeMessage message, long contentLength) {
 17 
                this.message = message;
 18 
                this.contentLength = contentLength;
 19 
        }
 20 
 
 21 
        public long getContentLength() {
 22 
               
 23 
                return contentLength;
 24 
        }
 25 
 
 26 
        public String getContentType() {
 27 
                try {
 28 
                        String header = message.getHeader("Content-Type")[0];
 29 
                        int ix = header.indexOf("boundary");
 30 
 
 31 
                        return "multipart/related;type=\"text/xml\"; "
 32 
                                        + "start=\"<test@example.com>\"; "
 33 
                                        + header.substring(ix);
 34 
                } catch (MessagingException e) {
 35 
                        e.printStackTrace();
 36 
                }
 37 
 
 38 
                return null;
 39 
        }
 40 
 
 41 
        public boolean isRepeatable() {
 42 
                return true;
 43 
        }
 44 
 
 45 
        public void writeRequest(OutputStream arg0) throws IOException {
 46 
                try {
 47 
                        if (buffer == null) {
 48 
                                arg0.write("\r\n".getBytes());
 49 
                                ((MimeMultipart) message.getContent()).writeTo(arg0);
 50 
                        } else
 51 
                                arg0.write(buffer);
 52 
                } catch (Exception e) {
 53 
                        e.printStackTrace();
 54 
                }
 55 
        }
 56 
 
 57 
        public MimeMultipart getMultiPartRequest() {
 58 
 
 59 
                try {
 60 
                        return ((MimeMultipart) message.getContent());
 61 
                } catch (IOException e) {
 62 
                        e.printStackTrace();
 63 
                } catch (MessagingException e) {
 64 
                        e.printStackTrace();
 65 
                }
 66 
 
 67 
                return null;
 68 
        }
 69 
}


RequestXmlDataSource.java
  1 
import java.io.ByteArrayInputStream;
  2 
import java.io.IOException;
  3 
import java.io.InputStream;
  4 
import java.io.OutputStream;
  5 
 
  6 
import javax.activation.DataSource;
  7 
 
  8 
public class RequestXmlDataSource implements DataSource {
  9 
        private String requestContent;
 10 
 
 11 
        public RequestXmlDataSource(String requestContent) {
 12 
                this.requestContent = requestContent;
 13 
        }
 14 
 
 15 
        public String getContentType() {
 16 
                return "text/xml; charset=UTF-8";
 17 
        }
 18 
 
 19 
        public InputStream getInputStream() throws IOException {
 20 
                byte[] bytes = requestContent.getBytes("UTF-8");
 21 
                return new ByteArrayInputStream(bytes);
 22 
        }
 23 
 
 24 
        public String getName() {
 25 
                return "";
 26 
        }
 27 
 
 28 
        public OutputStream getOutputStream() throws IOException {
 29 
                return null;
 30 
        }
 31 
}

AttachmentDataSource.java
  1 
import java.io.FileInputStream;
  2 
import java.io.IOException;
  3 
import java.io.InputStream;
  4 
import java.io.OutputStream;
  5 
 
  6 
import javax.activation.DataSource;
  7 
 
  8 
 
  9 
public class AttachmentDataSource implements DataSource
 10 
{
 11 
        private final String attachment;
 12 
 
 13 
        public AttachmentDataSource(String attachment)
 14 
        {
 15 
                this.attachment = attachment;
 16 
        }
 17 
 
 18 
        public String getContentType()
 19 
        {
 20 
                return "application/octet-stream";
 21 
        }
 22 
 
 23 
        public InputStream getInputStream() throws IOException
 24 
        {
 25 
                try
 26 
                {
 27 
                        return new FileInputStream(attachment);
 28 
                }
 29 
                catch( Exception e )
 30 
                {
 31 
                        throw new IOException( e.toString() );
 32 
                }
 33 
        }
 34 
 
 35 
        public String getName()
 36 
        {
 37 
                return attachment.substring(attachment.lastIndexOf("/")+1);
 38 
        }
 39 
 
 40 
        public OutputStream getOutputStream() throws IOException
 41 
        {
 42 
                return null;
 43 
        }
 44 
}




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