streaminitiation.java

JBother是纯Java开发的Jabber(即时消息开源软件)客户端。支持群组聊天

            return fDescription;
        }
        
        
        /**
         *  Sets the description of the file
         *
         *@param  aDescription  The new description
         */
        public void setDescription(String aDescription) {
            this.fDescription = aDescription;
        }
        
        
        /**
         *  Gets the md5 hash of the file
         *
         *@return    The md5 hash of the file, or <tt>null</tt> if it isn't available
         */
        public String getHash() {
            return fHash;
        }
        
        
        /**
         *  Sets the md5 hash of the file
         *
         *@param  aHash  The new md5 hash of the file
         */
        public void setHash(String aHash) {
            this.fHash = aHash;
        }
        
        
        /**
         *  Gets the creation date of the file
         *
         *@return    The creation date of the file, or <tt>null</tt> if it isn't available
         */
        public String getDate() {
            return fDate;
        }
        
        
        /**
         *  Gets the <tt>File</tt> object for this file
         *
         *@return    The <tt>File</tt> for this file, or <tt>null</tt> if it's not available
         */
        public File getFile() {
            return fFile;
        }
        
        
        /**
         *  Sets the <tt>File</tt> object for this file
         *
         *@param  aFile  The <tt>File</tt> object for this file
         */
        public void setFile(File aFile) {
            this.fFile = aFile;
        }
        
        
        /**
         *  Returns the XML representation of this packet
         *
         *@return    Returns the XML representation of this packet
         */
        public String getXML() {
            StringBuffer buf = new StringBuffer();
            buf.append("<file xmlns=\"").append(PROFILE).append("\"");
            if (getFileName() != null) {
                buf.append(" name=\"").append(getFileName()).append("\"");
            }
            if (getFileSize() != 0) {
                buf.append(" size=\"").append(getFileSize()).append("\"");
            }
            if (getDate() != null) {
                buf.append(" date=\"").append(getDate()).append("\"");
            }
            if (getHash() != null) {
                buf.append(" hash=\"").append(getHash()).append("\"");
            }
            buf.append(">");
            if (getDescription() != null) {
                buf.append("<desc>").append(getDescription()).append("</desc>");
            }
            buf.append("</file>");
            
            return buf.toString();
        }
        
        
        /**
         *  returns MD5 sum of a file
         *
         *@return    returns the md5 sum of a file
         */
        public String createMD5Sum() {
            String out = "";
            try {
                byte[] digest;
                MessageDigest md = MessageDigest.getInstance("MD5");
                BufferedInputStream bis = new BufferedInputStream(new FileInputStream(fFile));
                byte[] buff = new byte[1024];
                int chunk = 1024;
                int bytesRead = 0;
                while ((bytesRead = bis.read(buff, 0, chunk)) != -1) {
                    md.update(buff, 0, bytesRead);
                }
                digest = md.digest();
                String hexChar = null;
                if (digest != null) {
                    for (int i = 0; i < digest.length; i++) {
                        if (digest[i] > 0) {
                            hexChar = Integer.toHexString(digest[i]);
                        } else if (digest[i] < 0) {
                            hexChar = Integer.toHexString(digest[i]).substring(6);
                        } else {
                            hexChar = "00";
                        }
                        out += hexChar;
                    }
                }
                return out;
            } catch (FileNotFoundException e) {
                
                return null;
            } catch (NoSuchAlgorithmException e) {
                
                return null;
            } catch (IOException e) {
            }
            
            return null;
        }
        
    }
    
    
    /**
     *  class that will hold feature information re-using DataForm code to
     *
     */
    public static class Feature {
        
        private final static String BYTESTREAMS_FEATURE =
        "http://jabber.org/protocol/bytestreams";
        
        private final static String IBB_FEATURE = "http://jabber.org/protocol/ibb";
        
        DataForm fDataForm;
        int preferred = -1;
        
        
        /**
         *  Creates the "features" portion of the StreamInitiation packet
         */
        public Feature(int type) {
            this("form");
            preferred = type;
            createForm();
        }
        
        public Feature()
        {
            this(-1);
        }
        
        /**
         * Adds the various data fields to the data form
         **/
        private void createForm() {
            FormField field = new FormField("stream-method");
            field.setType(FormField.TYPE_LIST_SINGLE);
            if(preferred == -1 || preferred == FileTransferManager.TYPE_SOCKS5) 
                field.addOption(new FormField.Option("http://jabber.org/protocol/bytestreams"));
            if(preferred == -1 || preferred == FileTransferManager.TYPE_IBB)
                field.addOption(new FormField.Option("http://jabber.org/protocol/ibb"));
            fDataForm.addField(field);
        }
        
        
        /**
         *  Creates the "features" portion of the StreamInitiation object
         *
         *@param  aDataFormType  The type of data form you wish to use for this packet
         */
        public Feature(String aDataFormType) {
            
            fDataForm = new DataForm(aDataFormType);
            
        }
        
        /**
         * Returns the data form for this packet
         *@return the DataForm for this packet
         */
        public DataForm getDataForm() { return fDataForm; }
        
        
        /**
         * Gets the XML representation of this part of the packet
         *
         *@return    the XML representation of this part of the packet
         */
        public String getXML() {
            StringBuffer buf = new StringBuffer();
            buf.append("<feature xmlns=\"http://jabber.org/protocol/feature-neg\">");
            if (fDataForm != null) {
                buf.append(fDataForm.toXML());
            }
            buf.append("</feature>");
            
            return buf.toString();
        }
        
        
        /**
         *  Sets the DataForm to be used
         *
         *@param  fFeatureForm  The new DataForm
         */
        public void setDataForm(DataForm fFeatureForm) {
            this.fDataForm = fFeatureForm;
        }
        
        /**
         *  Determines if this packet supports IBB
         *
         *@return   <tt>true</tt> if this packet supports IBB
         */
        public boolean providesIBBOption() {
            return providesOption(IBB_FEATURE);
        }
        
        
        /**
         *  check if this Feature provides bytestream option this method works
         *  with both "set" and "result" <si> requests, the one in form:
         *
         *@return    <tt>true</tt> if this feature provides bytestreams
         */
        public boolean providesBytestreamOption() {
            return providesOption(BYTESTREAMS_FEATURE);
        }
        
        
        /**
         *  Checks if this packet supports a feature
         *
         *@param  o  The feature to check
         *@return    <tt>true</tt> if the feature is supported
         */
        private boolean providesOption(String o) {
            // check if the caller asks for bytestream feature
            Iterator iFields = fDataForm.getFields();
            while (iFields.hasNext()) {
                FormField field = (FormField) iFields.next();
                if (field.getVariable().equals("stream-method")) {
                    Iterator iOptions = field.getOptions();
                    while (iOptions.hasNext()) {
                        FormField.Option option = (FormField.Option) iOptions.next();
                        
                        if (option.getValue().equals(o)) {
                            return true;
                        }
                    }
                    Iterator iValues = field.getValues();
                    while (iValues.hasNext()) {
                        String value = (String) iValues.next();
                        if (value.equals(o)) {
                            return true;
                        }
                    }
                }
            }
            return false;
        }
        
    }
}