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package model.asn1;
import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
import ui.Utils;
import java.nio.charset.StandardCharsets;
import java.time.ZonedDateTime;
/**
* Common base-class for models like UTCTime and GeneralizedTime. Despite all the formatting and encoding differences,
* it stores a timestamp and corresponding timezone.
*/
public abstract class ASN1Time extends ASN1Object {
/**
* The time.
*/
private final ZonedDateTime timestamp;
/**
* EFFECTS: Initialize the time with the specific tag, parentTag, and timestamp. For tag and parentTag, consult
* {@link ASN1Object}.
*/
public ASN1Time(Tag tag, Tag parentTag, ZonedDateTime timestamp) {
super(tag, parentTag);
this.timestamp = timestamp;
}
/**
* EFFECTS: Parse and decode DER bytes into the corresponding time type. For more info on decoding, take a look at
* {@link ASN1Object}.
* Throws {@link ParseException} if the input is invalid:
* - Invalid date format
* - Zero length
* - Other circumstances (e.g., early EOF) as seen in {@link ASN1Object}
* MODIFIES: this, encoded
*/
public ASN1Time(BytesReader encoded, boolean hasParentTag) throws ParseException {
super(encoded, hasParentTag);
this.timestamp = toDate(new String(Utils.byteToByte(encoded.require(getLength(), true))));
}
/**
* EFFECTS: Generate the byte array for the formatted string.
*/
@Override
public Byte[] encodeValueDER() {
return Utils.byteToByte(toString().getBytes(StandardCharsets.UTF_8));
}
/**
* EFFECTS: Convert the given string into corresponding timestamp.
* Throws {@link ParseException} if the time is malformed.
*/
public abstract ZonedDateTime toDate(String str) throws ParseException;
/**
* EFFECTS: Convert getTimestamp() into corresponding ASN.1 time format.
*/
@Override
public abstract String toString();
public ZonedDateTime getTimestamp() {
return timestamp;
}
}
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