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fix: exclude Arabic diacritics from spam character-density check #16

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fix: exclude Arabic diacritics from spam character-density check #16

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10 changes: 8 additions & 2 deletions query_router.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
"""

import re
import unicodedata

from config import SearchMode

Expand Down Expand Up @@ -44,10 +45,15 @@ def is_spam(query):
if _SPAM_WA_RE.search(q):
return True
# High special-character density: >40% of non-space chars are punctuation/symbols.
# .isalpha() handles Arabic and other Unicode letters correctly.
# Exclude Unicode combining marks (Mn) — Arabic diacritics (harakat) are Mn
# and are part of the word, not punctuation. Without this, heavily voweled
# Arabic like "اللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ" exceeds the threshold and is
# wrongly rejected.
non_space = [c for c in q if not c.isspace()]
if len(non_space) >= 8:
special = sum(1 for c in non_space if not c.isalpha() and not c.isdigit())
special = sum(1 for c in non_space
if not c.isalpha() and not c.isdigit()
and unicodedata.category(c) != 'Mn')
if special / len(non_space) > 0.4:
return True
return False
Expand Down