Fix: is_english_text -> is_korean_text (30% threshold)

app.py

@@ -69,6 +69,34 @@ import functools
 import time # Added for potential retries
 
 
+def is_korean_text(text: str, threshold: float = 0.3) -> bool:
+    """
+    Check if text contains sufficient Korean characters.
+    Returns True if Korean character ratio >= threshold (default 30%).
+    Also returns True for empty text or text with mostly numbers/punctuation.
+    """
+    if not text:
+        return True
+    
+    korean_count = 0
+    letter_count = 0
+    
+    for char in text:
+        # Check if it's a letter (Korean, English, etc.)
+        if char.isalpha():
+            letter_count += 1
+            # Korean Unicode ranges: Hangul Syllables, Hangul Jamo, Hangul Compatibility Jamo
+            if '\uAC00' <= char <= '\uD7AF' or '\u1100' <= char <= '\u11FF' or '\u3130' <= char <= '\u318F':
+                korean_count += 1
+    
+    # If no letters, allow (might be numbers, punctuation, etc.)
+    if letter_count == 0:
+        return True
+    
+    korean_ratio = korean_count / letter_count
+    return korean_ratio >= threshold
+
+
 def get_client_ip():
     """Get the client's IP address, handling proxies and load balancers."""
     # Check for forwarded headers first (common with reverse proxies)
@@ -555,9 +583,9 @@ def generate_tts():
     if not text or len(text) > 1000:
         return jsonify({"error": "Invalid or too long text"}), 400
     
-    # Check if text is in English
-    if not is_english_text(text):
-        return jsonify({"error": "Only English language text is supported for now. Please provide text in English. A multilingual Arena is coming soon!"}), 400
+    # Check if text contains Korean (at least 30% Korean characters)
+    if not is_korean_text(text):
+        return jsonify({"error": "한국어 텍스트를 입력해주세요. 최소 30% 이상의 한국어가 포함되어야 합니다."}), 400
     
     # Check if sentence has already been consumed
     if is_sentence_consumed(text):