Сервер: уточнить правила имён каналов и поиск треда

SHiNE-server/shine-server-db/src/main/java/shine/db/channels/ChannelNameRules.java

@@ -8,6 +8,10 @@ public final class ChannelNameRules {
     private static final int MAX_DISPLAY_NAME_LENGTH = 32;
     private static final Pattern DISPLAY_ALLOWED_PATTERN =
             Pattern.compile("^[A-Za-z0-9_-]+$");
+    private static final Pattern PUBLIC_CHANNEL_ALLOWED_PATTERN =
+            Pattern.compile("^[A-Za-z0-9_-]+$");
+    private static final Pattern DIGITS_ONLY_PATTERN =
+            Pattern.compile("^[0-9]+$");
 
     private ChannelNameRules() {}
 
@@ -34,6 +38,17 @@ public final class ChannelNameRules {
         return normalized;
     }
 
+    public static String requireValidPublicDisplayNameForCreate(String rawName) {
+        String normalized = requireValidDisplayNameForCreate(rawName);
+        if (!PUBLIC_CHANNEL_ALLOWED_PATTERN.matcher(normalized).matches()) {
+            throw new IllegalArgumentException("channelName contains unsupported characters");
+        }
+        if (DIGITS_ONLY_PATTERN.matcher(normalized).matches()) {
+            throw new IllegalArgumentException("channelName must not contain only digits");
+        }
+        return normalized;
+    }
+
     public static String toCanonicalSlug(String rawName) {
         String normalized = normalizeDisplayName(rawName);
         if (normalized.isEmpty()) {