1package eu.siacs.conversations.utils;
 2
 3import android.graphics.Color;
 4
 5import org.hsluv.HUSLColorConverter;
 6
 7import java.nio.charset.StandardCharsets;
 8import java.security.MessageDigest;
 9
10class XEP0392Helper {
11
12    private static double angle(String nickname) {
13        try {
14            MessageDigest sha1 = MessageDigest.getInstance("SHA-1");
15            byte[] digest = sha1.digest(nickname.getBytes(StandardCharsets.UTF_8));
16            int angle = ((int) (digest[0]) & 0xff) + ((int) (digest[1]) & 0xff) * 256;
17            return angle / 65536.;
18        } catch (Exception e) {
19            return 0.0;
20        }
21    }
22
23    static int rgbFromNick(String name) {
24        double[] hsluv = new double[3];
25        hsluv[0] = angle(name) * 360;
26        hsluv[1] = 100;
27        hsluv[2] = 50;
28        double[] rgb = HUSLColorConverter.hsluvToRgb(hsluv);
29        return Color.rgb((int) Math.round(rgb[0] * 255), (int) Math.round(rgb[1] * 255), (int) Math.round(rgb[2] * 255));
30    }
31}