disabled by default variant of XEP-0392

1 files changed, 30 insertions, 0 deletions

diff --git a/src/main/java/de/pixart/messenger/utils/XEP0392Helper.java b/src/main/java/de/pixart/messenger/utils/XEP0392Helper.java
new file mode 100644
index 000000000..bbfe50898
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/utils/XEP0392Helper.java
@@ -0,0 +1,30 @@
+package de.pixart.messenger.utils;
+
+import android.graphics.Color;
+
+import org.hsluv.HUSLColorConverter;
+
+import java.security.MessageDigest;
+
+public class XEP0392Helper {
+
+    private static double angle(String nickname) {
+        try {
+            MessageDigest sha1 = MessageDigest.getInstance("SHA-1");
+            byte[] digest = sha1.digest(nickname.getBytes("UTF-8"));
+            int angle = ((int) (digest[0]) & 0xff) + ((int) (digest[1]) & 0xff) * 256;
+            return angle / 65536.;
+        } catch (Exception e) {
+            return 0.0;
+        }
+    }
+
+    public static int rgbFromNick(String name) {
+        double[] hsluv = new double[3];
+        hsluv[0] = angle(name) * 360;
+        hsluv[1] = 100;
+        hsluv[2] = 50;
+        double[] rgb = HUSLColorConverter.hsluvToRgb(hsluv);
+        return Color.rgb((int) Math.round(rgb[0] * 255), (int) Math.round(rgb[1] * 255), (int) Math.round(rgb[2] * 255));
+    }
+}
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