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[CT414]: Assignment 1 error handling and testing

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Aindréas Ó hAodha
2025-02-02 18:21:18 +00:00
parent 5cfe0a42a3
commit 66bffe0d85
9 changed files with 54 additions and 12 deletions
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24
year4/semester2/CT414/assignments/assignment1/code/src/client/ApplicationClient.java
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@ -1,5 +1,7 @@
package client;
import exceptions.InvalidCredentialsException;
import exceptions.InvalidSessionIDException;
import interfaces.ApplicationForm;
import interfaces.ApplicationHandler;
@ -21,14 +23,22 @@ public class ApplicationClient {
System.out.println("ApplicationHandler found in registry");
// login
System.out.printf("Enter your username\n> ");
String username = scanner.nextLine();
long sessionID;
while (true) {
try {
System.out.printf("Enter your username\n> ");
String username = scanner.nextLine();
System.out.printf("Enter your password\n> ");
String password = scanner.nextLine();
System.out.printf("Enter your password\n> ");
String password = scanner.nextLine();
long sessionID = handler.login(username, password);
System.out.println("Successfully logged in with session ID: " + sessionID);
sessionID = handler.login(username, password);
System.out.println("Successfully logged in with session ID: " + sessionID);
break;
} catch (Exception e) {
System.out.println("Username or password incorrect, try again.");
}
}
// download application form
ApplicationForm form = handler.downloadApplicationForm(sessionID);
@ -52,6 +62,8 @@ public class ApplicationClient {
handler.submitApplicationForm(sessionID, form);
System.out.println("Successfully submitted application form.");
} catch (InvalidSessionIDException e) {
System.out.println("Invalid session ID, exiting...");
} catch (Exception e) {
e.printStackTrace();
} finally {

2
year4/semester2/CT414/assignments/assignment1/code/src/exceptions/InvalidCredentialsException.java
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@ -2,7 +2,7 @@ package exceptions;
import java.rmi.RemoteException;
public class InvalidCredentialsException extends RemoteException {
public class InvalidCredentialsException extends Exception {
public InvalidCredentialsException() {
super("Invalid username or password.");
}

2
year4/semester2/CT414/assignments/assignment1/code/src/exceptions/InvalidSessionIDException.java
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@ -2,7 +2,7 @@ package exceptions;
import java.rmi.RemoteException;
public class InvalidSessionIDException extends RemoteException {
public class InvalidSessionIDException extends Exception {
public InvalidSessionIDException() {
super("Invalid or expired session ID.");
}

13
year4/semester2/CT414/assignments/assignment1/code/src/implementations/ApplicationHandlerImpl.java
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@ -10,6 +10,13 @@ import java.io.*;
public class ApplicationHandlerImpl implements ApplicationHandler {
private ArrayList<Long> sessions = new ArrayList<Long>();
// private method to validate session ids
private boolean isSessionIDValid(long sessionID) {
// check that session is valid and has not expired
// letting session ids expire after 60 seconds for easier testing, a more practical number would be something like 10 minutes
return sessions.contains(sessionID) && ((System.currentTimeMillis()) - sessionID < 6000);
}
@Override
public long login(String username, String password) throws RemoteException, InvalidCredentialsException {
// hardcoded username and password (great practice for security)
@ -21,13 +28,15 @@ public class ApplicationHandlerImpl implements ApplicationHandler {
return sessionId;
} else {
System.out.println("Login failed with user " + username + " and password " + password);
throw new InvalidCredentialsException("Invalid username or password.");
}
}
@Override
public ApplicationForm downloadApplicationForm(long sessionID) throws RemoteException, InvalidSessionIDException {
if (sessions.contains(sessionID)) {
// check that session is valid and has not expired
if (isSessionIDValid(sessionID)) {
System.out.println("Returning application form for session ID: " + sessionID);
return new ApplicationFormV1();
} else {
@ -37,7 +46,7 @@ public class ApplicationHandlerImpl implements ApplicationHandler {
@Override
public void submitApplicationForm(long sessionID, ApplicationForm applicationForm) throws RemoteException, InvalidSessionIDException {
if (sessions.contains(sessionID)) {
if (isSessionIDValid(sessionID)) {
String filename = applicationForm.getName().replaceAll("\\s", "_") + ".txt";
try (BufferedWriter writer = new BufferedWriter(new FileWriter(filename))) {

2
year4/semester2/CT414/assignments/assignment1/code/src/run.sh
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@ -14,4 +14,4 @@ $TERM -e java -cp $src_path -Djava.rmi.server.codebase=file:$src_path/ server.Ap
sleep 1
# start client (in a new terminal)
$TERM -e java -cp $src_path -Djava.rmi.server.codebase=file:$src_path/ client.ApplicationClient
$TERM -e bash -c "java -cp $src_path -Djava.rmi.server.codebase=file:$src_path/ client.ApplicationClient ; zsh"