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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;
/**
* Represents an ASN.1 string with an optional character set restriction. Users should choose from one of its
* implementations that encode a specific ASN.1 string type (e.g., {@link PrintableString} or {@link IA5String}).
*/
public abstract class ASN1String extends ASN1Object {
private String rawString;
/**
* EFFECTS: Constructs an ASN1String with the given tag, parent tag, and string.
* - Throws {@link ParseException} if the string does not pass corresponding restrictions of the specific
* string type (same as {@link ASN1String#validate(String)})
* REQUIRES: For the requirements of tag and parentTag, consult {@link ASN1Object}.
*/
public ASN1String(Tag tag, Tag parentTag, String string) throws ParseException {
super(tag, parentTag);
setString(string);
}
/**
* EFFECTS: Parse the input value. See {@link ASN1Object} with the rawString.
* Throws {@link ParseException} when invalid:
* - String does not pass type restrictions
* - Early EOF
* - Other cases as seen in {@link ASN1Object}
* MODIFIES: this, encoded (bytes are read)
*/
public ASN1String(BytesReader encoded, boolean hasParentTag) throws ParseException {
super(encoded, hasParentTag);
}
/**
* EFFECTS: Validate and set the string.
* Throws {@link ParseException} if the string is invalid.
* MODIFIES: this
*/
protected void setString(String rawString) throws ParseException {
if (!validate(rawString)) {
throw new ParseException(String.format("The string '%s' is illegal for '%s'.",
rawString,
getClass().getSimpleName()));
}
this.rawString = rawString;
}
/**
* EFFECTS: Validate whether the given string matches the ASN.1 restrictions on this specific string type. By
* default, it always returns true.
*/
protected boolean validate(String newString) {
return true;
}
/**
* Same as {@link ASN1String#getString()}.
*/
@Override
public String toString() {
return rawString;
}
/**
* EFFECTS: Encode the string in DER bytes (big-endian UTF-8).
*/
@Override
public Byte[] encodeValueDER() {
final byte[] bytes = rawString.getBytes(StandardCharsets.UTF_8);
Byte[] b = new Byte[bytes.length];
for (int i = 0; i < bytes.length; i++) {
b[i] = bytes[i];
}
return b;
}
public String getString() {
return rawString;
}
}
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