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package ui.tui;
import model.asn1.exceptions.InvalidDBException;
import model.asn1.exceptions.ParseException;
import model.ca.CertificationAuthority;
import persistence.Decoder;
import persistence.FS;
import ui.Utils;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.Scanner;
/**
* Main program
*/
public class JCA {
/**
* Default db file (./data/ca.json)
*/
private static final Path PATH_DEFAULT = Path.of("data", "ca.json");
/**
* Instances of the five screens;
*/
private final UIHandler mainScreen;
private final UIHandler mgmtScreen;
private final UIHandler issueScreen;
private final UIHandler templatesScreen;
private final UIHandler templateSetScreen;
/**
* The CA
*/
private CertificationAuthority ca;
/**
* The current screen.
*/
private UIHandler screen;
/**
* There are unsaved changes.
*/
private boolean unsaved = false;
/**
* EFFECTS: Init with main screen and empty CA. No private key and no CA cert.
* Throws {@link NoSuchAlgorithmException} when crypto issue happens.
*/
public JCA() throws NoSuchAlgorithmException, InvalidKeySpecException {
this.mainScreen = new MainScreen(this);
this.mgmtScreen = new MgmtScreen(this);
this.issueScreen = new IssueScreen(this);
this.templatesScreen = new TemplatesScreen(this);
this.templateSetScreen = new TemplateSetScreen(this);
setScreen(Screen.MAIN);
this.ca = new CertificationAuthority();
}
/**
* EFFECT: Checks if the CA is installed or not (according to the desired state) and print if not matching. Returns
* true if matching.
*/
public boolean checkCA(boolean requireInstalled) {
if (requireInstalled && ca.getCertificate() == null) {
System.out.println("No CA installed");
return false;
} else if (!requireInstalled && ca.getCertificate() != null) {
System.out.println("CA already installed");
return false;
}
return true;
}
/**
* EFFECTS: Read PEM from stdin, matched the given tag.
* Throws {@link ParseException} if the input is incorrect.
*/
public Byte[] handleInputPEM(String desiredTag) throws ParseException {
final Scanner scanner = new Scanner(System.in);
StringBuilder in = new StringBuilder();
while (true) {
final String line = scanner.nextLine();
in.append(line);
in.append("\n");
if (line.matches("-----END .*-----")) {
break;
}
}
return Utils.parsePEM(Utils.byteToByte(in.toString().getBytes(StandardCharsets.UTF_8)), desiredTag);
}
/**
* EFFECT: Set the current screen with optional args. Exit the program when mode is null.
* MODIFIES: this
*/
public void setScreen(Screen mode, Object... args) {
if (mode == null) {
System.exit(0);
}
switch (mode) {
case MAIN:
this.screen = mainScreen;
break;
case MGMT:
this.screen = mgmtScreen;
break;
case ISSUE:
this.screen = issueScreen;
break;
case TEMPLATES:
this.screen = templatesScreen;
break;
case TEMPLATE_SET:
this.screen = templateSetScreen;
break;
}
screen.enter(args);
}
/**
* EFFECTS: Read the database file and replace all local states.
* MODIFIES: this
*/
private void load() {
if (unsaved) {
System.out.println("Current database is not saved yet.");
return;
}
try {
this.ca = Decoder.decodeCA(FS.read(PATH_DEFAULT));
} catch (InvalidDBException | NoSuchAlgorithmException e) {
System.out.println(e.getMessage());
if (e.getCause() != null) {
System.out.println(e.getCause().getMessage());
e.getCause().printStackTrace();
}
}
}
/**
* EFFECTS: Handle input line
* MODIFIES: this
*/
private void handleLine(String... args) {
if (args[0].equals("log")) {
ca.getLogs().forEach(System.out::println);
return;
}
if ("help".equals(args[0])) {
screen.help();
System.out.println("log\tView audit logs");
System.out.println("load\tLoad database");
System.out.println("save\tSave database");
} else if ("commit".equals(args[0])) {
screen.commit();
} else if ("show".equals(args[0])) {
screen.show();
} else if ("exit".equals(args[0])) {
setScreen(screen.exit());
} else if ("save".equals(args[0])) {
save();
} else if ("load".equals(args[0])) {
load();
} else {
screen.command(args);
}
printPS1();
}
/**
* EFFECTS: Print the '*user@JCA PS1' line
*/
private void printPS1() {
System.out.printf("%s%s@JCA %s ",
unsaved ? "*" : "",
ca.getUser(),
screen.getPS1());
}
/**
* EFFECTS: Save the DB
*/
public void save() {
try {
FS.write(PATH_DEFAULT, Decoder.encodeCA(ca));
unsaved = false;
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
/**
* EFFECTS: Run the program
*/
public void run() {
printPS1();
final Scanner scanner = new Scanner(System.in);
while (true) {
String[] args = scanner.nextLine().split(" ");
if (args.length <= 0 || args[0].isBlank()) {
printPS1();
continue;
}
handleLine(args);
}
}
public void setUnsaved(boolean unsaved) {
this.unsaved = unsaved;
}
public CertificationAuthority getCa() {
return ca;
}
}
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