Java Programing

for( int eachAuthMethod=0;eachAuthMethod

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} try { satellaPeerGroup=myNetPeerGroup.newGroup( satellaPeerGroupAdvertisement); } catch (net.jxta.exception.PeerGroupException e) { System.err.println(”Can’t create Peer Group from Advertisement”); e.printStackTrace(); return null; } return satellaPeerGroup; } private void joinPeerGroup(PeerGroup satellaPeerGroup, String login,String passwd) { // Get the Heavy Weight Paper for the resume // Alias define the type of credential to be provided StructuredDocument creds = null; try { // Create the resume to apply for the Job // Alias generate the credentials for the Peer Group AuthenticationCredential authCred =new AuthenticationCredential(satellaPeerGroup, null, creds); // Create the resume to apply for the Job // Alias generate the credentials for the Peer Group MembershipService membershipService = satellaPeerGroup. getMembershipService(); // Send the resume and get the Job application form // Alias get the Authenticator from the Authentication creds Authenticator auth = membershipService.apply(authCred); // Fill in the Job Application Form // Alias complete the authentication completeAuth( auth, login, passwd ); // Check if I got the Job // Alias Check if the authentication that was submitted was //accepted. if (!auth.isReadyForJoin()) { System.out.println( “Failure in authentication.”); System.out.println( “Group was not joined. Does not know how to complete authenticator”); } // I got the Job, Join the company // Alias I the authentication I completed was accepted, // therefore join the Peer Group accepted. membershipService.join(auth); 135 JXTA v2.3.x: Java Programmer s Guide

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} catch (Exception e) { System.out.println(”Failure in authentication.”); System.out.println(”Group was not joined. Login was incorrect.”); e.printStackTrace(); } } private void completeAuth(Authenticator auth, String login, String passwd) throws Exception { Method [] methods = auth.getClass().getMethods(); Vector authMethods = new Vector(); // Find out with fields of the application needs to be filled // Alias Go through the methods of the Authenticator class and // copy them sorted by name into a vector. for(int eachMethod = 0; eachMethod < methods.length; eachMethod++) { if (methods[eachMethod].getName().startsWith("setAuth") ) { if (Modifier.isPublic( methods[eachMethod].getModifiers())) { // sorted insertion. for(int doInsert = 0; doInsert<=authMethods.size(); doInsert++ ) { int insertHere = -1; if( doInsert == authMethods.size() ) insertHere = doInsert; else { if(methods[eachMethod].getName().compareTo (((Method)authMethods.elementAt( doInsert)).getName()) <= 0 ) insertHere = doInsert; } // end else if(-1!= insertHere ) { authMethods.insertElementAt( methods[eachMethod],insertHere); break; } // end if ( -1 != insertHere) } // end for (int doInsert=0 } // end if (modifier.isPublic } // end if (methods[eachMethod] } // end for (int eachMethod) Object [] AuthId = {login}; Object [] AuthPasswd = {passwd}; 136 JXTA v2.3.x: Java Programmer s Guide

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private PeerGroup discoverPeerGroup(PeerGroup myNetPeerGroup, PeerGroupID satellaPeerGroupID) { // First discover the peer group // In most cases we should use discovery listeners so that // we can do the discovery assynchroneously. // Here I won’t, for increased simplicity and because // The Peer Group Advertisement is in the local cache for sure PeerGroup satellaPeerGroup; DiscoveryService myNetPeerGroupDiscoveryService=null; if (myNetPeerGroup!=null) { myNetPeerGroupDiscoveryService = myNetPeerGroup.getDiscoveryService(); } else { System.err.println(”Can’t join Peer Group since its parent is null”); System.exit(1); } boolean isGroupFound=false; Enumeration localPeerGroupAdvertisementEnumeration=null; PeerGroupAdvertisement satellaPeerGroupAdvertisement=null; while(!isGroupFound) { try { localPeerGroupAdvertisementEnumeration = myNetPeerGroupDiscoveryService. getLocalAdvertisements(DiscoveryService.GROUP, “GID”, satellaPeerGroupID.toString()); } catch (java.io.IOException e) { System.out.println(”Can’t Discover Local Adv”); } if (localPeerGroupAdvertisementEnumeration!=null) { while (localPeerGroupAdvertisementEnumeration. hasMoreElements()) { PeerGroupAdvertisement pgAdv=null; pgAdv= (PeerGroupAdvertisement) localPeerGroupAdvertisementEnumeration. nextElement(); if (pgAdv.getPeerGroupID(). equals(satellaPeerGroupID)) { satellaPeerGroupAdvertisement=pgAdv; isGroupFound=true ; break ; } } } try { Thread.sleep(5 * 1000); } catch(Exception e) {} 134 JXTA v2.3.x: Java Programmer s Guide

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} catch (net.jxta.exception.PeerGroupException e) { System.err.println(”Can’t execute: StdPeerGroupParamAdv passwdMembershipPeerGroupParamAdv = new StdPeerGroupParamAdv (allPurposePeerGroupImplAdv.getParam());”); System.exit(1); } Hashtable allPurposePeerGroupServicesHashtable = passwdMembershipPeerGroupParamAdv.getServices(); Enumeration allPurposePeerGroupServicesEnumeration = allPurposePeerGroupServicesHashtable.keys(); boolean membershipServiceFound=false; while ((!membershipServiceFound) && (allPurposePeerGroupServicesEnumeration.hasMoreElements())) { Object allPurposePeerGroupServiceID = allPurposePeerGroupServicesEnumeration.nextElement(); if (allPurposePeerGroupServiceID.equals (PeerGroup.membershipClassID)) { // allPurposePeerGroupMemershipServiceModuleImplAdv is // the all Purpose Mermbership Service for the all // purpose Peer Group Module Impl adv ModuleImplAdvertisement allPurposePeerGroupMemershipServiceModuleImplAdv= (ModuleImplAdvertisement) allPurposePeerGroupServicesHashtable.get (allPurposePeerGroupServiceID); //Create the passwdMembershipServiceModuleImplAdv passwdMembershipServiceModuleImplAdv=this.createPasswdM embershipServiceModuleImplAdv (allPurposePeerGroupMemershipServiceModuleImplAdv); //Remove the All purpose Membership Service implementation allPurposePeerGroupServicesHashtable.remove (allPurposePeerGroupServiceID); // And Replace it by the Passwd Membership Service // Implementation allPurposePeerGroupServicesHashtable.put( PeerGroup.membershipClassID, passwdMembershipServiceModuleImplAdv); membershipServiceFound=true; // Now the Service Advertisements are complete. Let’s // update the passwdMembershipPeerGroupModuleImplAdv by // Updating its param passwdMembershipPeerGroupModuleImplAdv.setParam ((Element) passwdMembershipPeerGroupParamAdv.getDocument(new MimeMediaType(”text/xml”))); // Update its Spec ID This comes from the // Instant P2P PeerGroupManager Code (Thanks !!!!) if (!passwdMembershipPeerGroupModuleImplAdv.getModuleSpecID().equals 132 JXTA v2.3.x: Java Programmer s Guide

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(PeerGroup.allPurposePeerGroupSpecID)) { passwdMembershipPeerGroupModuleImplAdv.setModuleSpe cID(IDFactory.newModuleSpecID (passwdMembershipPeerGroupModuleImplAdv.getModuleSpecID().getBaseClass ())); } else { ID passwdGrpModSpecID= ID.nullID; try { passwdGrpModSpecID = IDFactory.fromURL(new URL( “urn”, “”, “jxta:uuid-”+ “DeadBeefDeafBabaFeedBabe00000001″ +”04″ +”06″)); } catch (java.net.MalformedURLException e) {} catch (java.net.UnknownServiceException ee) {} passwdMembershipPeerGroupModuleImplAdv. setModuleSpecID((ModuleSpecID) passwdGrpModSpecID); } //End Else membershipServiceFound=true; } //end if (allPurposePeerGroupServiceID. // equals(PeerGroup.membershipClassID)) }//end While return passwdMembershipPeerGroupModuleImplAdv; } private ModuleImplAdvertisement createPasswdMembershipServiceModuleImplAdv(ModuleImplAdvertisement allPurposePeerGroupMemershipServiceModuleImplAdv) { //Create a new ModuleImplAdvertisement for the // Membership Service ModuleImplAdvertisement passwdMembershipServiceModuleImplAdv = (ModuleImplAdvertisement) AdvertisementFactory.newAdvertisement (ModuleImplAdvertisement.getAdvertisementType()); passwdMembershipServiceModuleImplAdv.setModuleSpecID (PasswdMembershipService.passwordMembershipSpecID); passwdMembershipServiceModuleImplAdv.setCode (PasswdMembershipService.class.getName()); passwdMembershipServiceModuleImplAdv.setDescription(” Module Impl Advertisement for the PasswdMembership Service”); passwdMembershipServiceModuleImplAdv.setCompat (allPurposePeerGroupMemershipServiceModuleImplAdv.getCompat()); passwdMembershipServiceModuleImplAdv.setUri (allPurposePeerGroupMemershipServiceModuleImplAdv.getUri()); passwdMembershipServiceModuleImplAdv.setProvider (allPurposePeerGroupMemershipServiceModuleImplAdv.getProvider()); return passwdMembershipServiceModuleImplAdv; } 133 JXTA v2.3.x: Java Programmer s Guide

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System.exit(1); } // Finally Create the Peer Group if (satellaPeerGroupAdvertisement==null) { System.err.println(”satellaPeerGroupAdvertisement is null”); } try { satellaPeerGroup=rootPeerGroup.newGroup( satellaPeerGroupAdvertisement); } catch (net.jxta.exception.PeerGroupException e) { System.err.println(”Can’t create Satella Peer Group from Advertisement”); e.printStackTrace(); return null; } return satellaPeerGroup; } private PeerGroupAdvertisement createPeerGroupAdvertisement( ModuleImplAdvertisement passwdMembershipModuleImplAdv, String groupName, String login, String passwd) { // Create a PeerGroupAdvertisement for the peer group PeerGroupAdvertisement satellaPeerGroupAdvertisement= (PeerGroupAdvertisement) AdvertisementFactory.newAdvertisement( PeerGroupAdvertisement.getAdvertisementType()); // Instead of creating a new group ID each time, by using the // line below // satellaPeerGroupAdvertisement.setPeerGroupID // (IDFactory.newPeerGroupID()); // I use a fixed ID so that each time I start SecurePeerGroup, // it creates the same Group satellaPeerGroupAdvertisement.setPeerGroupID( satellaPeerGroupID); satellaPeerGroupAdvertisement.setModuleSpecID( passwdMembershipModuleImplAdv.getModuleSpecID()); satellaPeerGroupAdvertisement.setName(groupName); satellaPeerGroupAdvertisement.setDescription(”Peer Group using Password Authentication”); // Now create the Structured Document Containing the login and // passwd informations. Login and passwd are put into the Param // section of the peer Group if (login!=null) { StructuredTextDocument loginAndPasswd= 130 JXTA v2.3.x: Java Programmer s Guide

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(StructuredTextDocument) StructuredDocumentFactory.newStructuredDocument( new MimeMediaType(”text/xml”),”Parm”); String loginAndPasswdString= login+”:”+ PasswdMembershipService.makePsswd(passwd)+”:”; TextElement loginElement = loginAndPasswd.createElement( “login”,loginAndPasswdString); loginAndPasswd.appendChild(loginElement); // All Right, now that loginAndPasswdElement // (The strucuted document // that is the Param Element for The PeerGroup Adv // is done, include it in the Peer Group Advertisement satellaPeerGroupAdvertisement.putServiceParam( PeerGroup.membershipClassID,loginAndPasswd); } return satellaPeerGroupAdvertisement; } private ModuleImplAdvertisement createPasswdMembershipPeerGroupModuleImplAdv(PeerGroup rootPeerGroup) { // Create a ModuleImpl Advertisement for the Passwd // Membership Service Take a allPurposePeerGroupImplAdv // ModuleImplAdvertisement parameter to // Clone some of its fields. It is easier than to recreate // everything from scratch // Try to locate where the PasswdMembership is within this // ModuleImplAdvertisement. // For a PeerGroup Module Impl, the list of the services // (including Membership) are located in the Param section ModuleImplAdvertisement allPurposePeerGroupImplAdv=null; try { allPurposePeerGroupImplAdv=rootPeerGroup.getAllPurposePeerG roupImplAdvertisement(); } catch (java.lang.Exception e) { System.err.println(”Can’t Execute: getAllPurposePeerGroupImplAdvertisement();”); System.exit(1); } ModuleImplAdvertisement passwdMembershipPeerGroupModuleImplAdv=allPurposePeerGroupImplAdv; ModuleImplAdvertisement passwdMembershipServiceModuleImplAdv=null; StdPeerGroupParamAdv passwdMembershipPeerGroupParamAdv=null; try { passwdMembershipPeerGroupParamAdv = new StdPeerGroupParamAdv( allPurposePeerGroupImplAdv.getParam()); 131 JXTA v2.3.x: Java Programmer s Guide

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satellaPeerGroup.getPeerGroupAdvertisement () ); } private PeerGroup createPeerGroup(PeerGroup rootPeerGroup, String groupName, String login, String passwd ) { // create the Peer Group by doing the following: // -Create a Peer Group Module Implementation Advertisement and publish it // -Create a Peer Group Adv and publish it // -Create a Peer Group from the Peer Group Adv and return this object PeerGroup satellaPeerGroup=null; PeerGroupAdvertisement satellaPeerGroupAdvertisement; // Create the PeerGroup Module Implementation Adv ModuleImplAdvertisement passwdMembershipModuleImplAdv ; passwdMembershipModuleImplAdv=this.createPasswdMembershipPeerGr oupModuleImplAdv(rootPeerGroup); // Publish it in the parent peer group DiscoveryService rootPeerGroupDiscoveryService = rootPeerGroup.getDiscoveryService(); try { rootPeerGroupDiscoveryService.publish( passwdMembershipModuleImplAdv, PeerGroup.DEFAULT_LIFETIME, PeerGroup.DEFAULT_EXPIRATION); rootPeerGroupDiscoveryService.remotePublish( passwdMembershipModuleImplAdv, PeerGroup.DEFAULT_EXPIRATION); } catch (java.io.IOException e) { System.err.println(”Can’t Publish passwdMembershipModuleImplAdv”); System.exit(1); } // Now, Create the Peer Group Advertisement satellaPeerGroupAdvertisement= this.createPeerGroupAdvertisement (passwdMembershipModuleImplAdv,groupName,login,passwd); // Publish it in the parent peer group try { rootPeerGroupDiscoveryService.publish( satellaPeerGroupAdvertisement, PeerGroup.DEFAULT_LIFETIME, PeerGroup.DEFAULT_EXPIRATION); rootPeerGroupDiscoveryService.remotePublish( satellaPeerGroupAdvertisement, PeerGroup.DEFAULT_EXPIRATION); } catch (java.io.IOException e) { System.err.println(”Can’t Publish satellaPeerGroupAdvertisement”); 129 JXTA v2.3.x: Java Programmer s Guide

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if (myNetPeerGroup!=null) { System.out.println(”JXTA platform Started …”); } else { System.err.println(” JXTA platform has failed to start: myNetPeerGroup is null”); System.exit(1); } //Generate the parameters: // login, passwd, peer group name and peer group id // for creating the Peer Group String login=”SecurePeerGroups”; String passwd=”RULE”; String groupName=”SatellaGroup”; // and finally peer group id // the peer group id is constant so that the same peer group is //recreated each time. try { satellaPeerGroupID = (PeerGroupID) net.jxta.id.IDFactory.fromURL( new java.net.URL(”urn”,”",GROUPID)); } catch (java.net.MalformedURLException e) { System.err.println(” Can’t create satellaPeerGroupID: MalformedURLException”) ; System.exit(1); } catch (java.net.UnknownServiceException e) { System.err.println(” Can’t create satellaPeerGroupID: UnknownServiceException “) ; System.exit(1); } // create The Passwd Authenticated Peer Group satellaPeerGroup =this.createPeerGroup( myNetPeerGroup,groupName,login,passwd); // join the satellaPeerGroup if (satellaPeerGroup!=null) { System.out.println(” Peer Group Created …”); discoveredSatellaPeerGroup=this.discoverPeerGroup( myNetPeerGroup,satellaPeerGroupID); if (discoveredSatellaPeerGroup!=null) { System.out.println(” Peer Group Found …”); this.joinPeerGroup(discoveredSatellaPeerGroup, login, passwd); } } System.out.println(” Peer Group Joined …”); // Print the Peer Group Adverstisement on sdt out. this.printXmlAdvertisement(”XML Advertisement for Peer Group Advertisement”, 128 JXTA v2.3.x: Java Programmer s Guide

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