X-Git-Url: https://git.nmode.ca/signal-cli/blobdiff_plain/4ab904b88e0b445c5e886fe91add69fb215dd455..1d2c7a479d791dedde6c2022ac65e9c82400af79:/src/main/java/org/asamk/signal/util/Util.java

diff --git a/src/main/java/org/asamk/signal/util/Util.java b/src/main/java/org/asamk/signal/util/Util.java
index c0efd271..4de49ec6 100644
--- a/src/main/java/org/asamk/signal/util/Util.java
+++ b/src/main/java/org/asamk/signal/util/Util.java
@@ -1,10 +1,33 @@
 package org.asamk.signal.util;
 
-import java.io.File;
-import java.io.IOException;
+import org.asamk.signal.manager.groups.GroupId;
+import org.asamk.signal.manager.groups.GroupIdFormatException;
+import org.whispersystems.libsignal.util.guava.Optional;
 
 public class Util {
-    public static File createTempFile() throws IOException {
-        return File.createTempFile("signal_tmp_", ".tmp");
+
+    private Util() {
+    }
+
+    public static String getStringIfNotBlank(Optional<String> value) {
+        var string = value.orNull();
+        if (string == null || string.isBlank()) {
+            return null;
+        }
+        return string;
+    }
+
+    public static String formatSafetyNumber(String digits) {
+        final var partCount = 12;
+        var partSize = digits.length() / partCount;
+        var f = new StringBuilder(digits.length() + partCount);
+        for (var i = 0; i < partCount; i++) {
+            f.append(digits, i * partSize, (i * partSize) + partSize).append(" ");
+        }
+        return f.toString();
+    }
+
+    public static GroupId decodeGroupId(String groupId) throws GroupIdFormatException {
+        return GroupId.fromBase64(groupId);
     }
 }