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package ganarchy.friendcode.sam;
import ganarchy.friendcode.util.ConfigUtil;
import org.apache.commons.codec.binary.Base32;
import java.security.SecureRandom;
import java.util.Properties;
/**
* Helper for I2P SAM authentication.
*/
public class I2PSamAuthUtil {
/**
* The default username. It is used by default.
*/
private static final String DEFAULT_USERNAME = "minecraft_friendcode";
/**
* Fallback authentication password, used on first install.
*/
private static final AuthenticationPair INSECURE_FALLBACK =
new AuthenticationPair(DEFAULT_USERNAME, "friendcode");
/**
* Returns the currently active SAM auth pair.
*/
public static AuthenticationPair getAuthPair() {
AuthenticationPair strongAuthPair = getStrongAuthPair();
if (strongAuthPair != null) {
return strongAuthPair;
}
return INSECURE_FALLBACK;
}
/**
* Generates and stores a modern auth pair.
*
* @return The generated auth pair.
*/
public static AuthenticationPair upgradeAuthPair() {
var rand = new SecureRandom();
var bytes = new byte[16];
rand.nextBytes(bytes);
var b32 = new Base32().encodeToString(bytes);
Properties auth = new Properties();
auth.setProperty("i2p.sam.username", DEFAULT_USERNAME);
auth.setProperty("i2p.sam.password", b32);
if (ConfigUtil.updateSettings(auth)) {
return new AuthenticationPair(DEFAULT_USERNAME, b32);
} else {
return INSECURE_FALLBACK;
}
}
/**
* Returns whether strong auth is enabled.
*/
public static boolean isStrongAuth() {
return getStrongAuthPair() != null;
}
/**
* Returns the currently active strong SAM auth pair, or null if using the
* weak fallback.
*/
private static AuthenticationPair getStrongAuthPair() {
Properties auth = new Properties();
if (ConfigUtil.getSettings(auth)) {
String username = auth.getProperty("i2p.sam.username");
String password = auth.getProperty("i2p.sam.password");
if (username != null && password != null) {
return new AuthenticationPair(username, password);
}
}
return null;
}
/**
* An authentication pair.
*
* @param user The username.
* @param password The password.
*/
public record AuthenticationPair(String user, String password) {
}
}
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