From 3e5c026f31b2403ea8e2387c1360bedb1ca4c27a Mon Sep 17 00:00:00 2001
From: Christian Schneppe <christian@pix-art.de>
Date: Sun, 26 Aug 2018 15:02:40 +0200
Subject: disabled by default variant of XEP-0392

---
 src/main/java/de/pixart/messenger/Config.java      |  2 ++
 .../java/de/pixart/messenger/utils/UIHelper.java   |  3 +++
 .../de/pixart/messenger/utils/XEP0392Helper.java   | 30 ++++++++++++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 src/main/java/de/pixart/messenger/utils/XEP0392Helper.java

(limited to 'src/main')

diff --git a/src/main/java/de/pixart/messenger/Config.java b/src/main/java/de/pixart/messenger/Config.java
index ac99b1709..644b0af82 100644
--- a/src/main/java/de/pixart/messenger/Config.java
+++ b/src/main/java/de/pixart/messenger/Config.java
@@ -77,6 +77,8 @@ public final class Config {
     public static final int CONNECT_DISCO_TIMEOUT = 30;
     public static final int MINI_GRACE_PERIOD = 750;
 
+    public static final boolean XEP_0392 = false; //enables a variant of XEP-0392 that is based on HSLUV
+
     public static final int FILE_SIZE = 1048576; // 1 MiB
 
     public static final int AVATAR_SIZE = 480;
diff --git a/src/main/java/de/pixart/messenger/utils/UIHelper.java b/src/main/java/de/pixart/messenger/utils/UIHelper.java
index f5730e981..b603f68ee 100644
--- a/src/main/java/de/pixart/messenger/utils/UIHelper.java
+++ b/src/main/java/de/pixart/messenger/utils/UIHelper.java
@@ -222,6 +222,9 @@ public class UIHelper {
     }
 
     public static int getColorForName(String name, boolean safe) {
+        if (Config.XEP_0392) {
+            return XEP0392Helper.rgbFromNick(name);
+        }
         if (name == null || name.isEmpty()) {
             return 0xFF202020;
         }
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));
+    }
+}
\ No newline at end of file
-- 
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