过滤敏感词

CustomKeyboard/Manager/KBSuggestionEngine.m

@@ -43,26 +43,41 @@
 
 - (NSArray<NSString *> *)suggestionsForPrefix:(NSString *)prefix limit:(NSUInteger)limit {
     if (prefix.length == 0 || limit == 0) { return @[]; }
+    // 为过滤留出候选空间，避免过滤后数量过少。
+    NSUInteger fetchLimit = limit;
+    if (fetchLimit < 80) {
+        fetchLimit = MIN((NSUInteger)80, MAX(fetchLimit * 4, fetchLimit));
+    }
+    NSArray<NSString *> *raw = nil;
 
     switch (self.engineType) {
         case KBSuggestionEngineTypeEnglish:
-            return [self kb_englishSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_englishSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
         case KBSuggestionEngineTypeSpanish:
-            return [self kb_spanishSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_spanishSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
         case KBSuggestionEngineTypePortuguese:
-            return [self kb_portugueseSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_portugueseSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
         case KBSuggestionEngineTypeIndonesian:
-            return [self kb_indonesianSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_indonesianSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
         case KBSuggestionEngineTypePinyinTraditional:
-            return [self kb_traditionalPinyinSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_traditionalPinyinSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
         case KBSuggestionEngineTypePinyinSimplified:
-            return [self kb_simplifiedPinyinSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_simplifiedPinyinSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
         case KBSuggestionEngineTypeBopomofo:
-            return [self kb_bopomofoSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_bopomofoSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
         case KBSuggestionEngineTypeLatin:
         default:
-            return [self kb_latinSuggestionsForPrefix:prefix limit:limit];
+            raw = [self kb_latinSuggestionsForPrefix:prefix limit:fetchLimit];
+            break;
     }
+    return [self kb_filterSensitiveSuggestions:raw limit:limit];
 }
 
 - (void)recordSelection:(NSString *)word {
@@ -880,4 +895,80 @@
     }
 }
 
+#pragma mark - Safety Filter
+
+- (NSArray<NSString *> *)kb_filterSensitiveSuggestions:(NSArray<NSString *> *)items
+                                                 limit:(NSUInteger)limit {
+    if (items.count == 0 || limit == 0) { return @[]; }
+    NSMutableOrderedSet<NSString *> *result = [NSMutableOrderedSet orderedSet];
+    for (id item in items) {
+        if (![item isKindOfClass:NSString.class]) { continue; }
+        NSString *word = (NSString *)item;
+        if (word.length == 0) { continue; }
+        if ([self kb_isSensitiveSuggestion:word]) { continue; }
+        [result addObject:word];
+        if (result.count >= limit) { break; }
+    }
+    return result.array ?: @[];
+}
+
+- (BOOL)kb_isSensitiveSuggestion:(NSString *)word {
+    NSString *normalized = [self kb_normalizedSuggestionToken:word];
+    if (normalized.length == 0) { return YES; }
+    if ([[self.class kb_blockedSuggestionWords] containsObject:normalized]) {
+        return YES;
+    }
+    for (NSString *fragment in [self.class kb_blockedSuggestionFragments]) {
+        if ([normalized containsString:fragment]) {
+            return YES;
+        }
+    }
+    return NO;
+}
+
+- (NSString *)kb_normalizedSuggestionToken:(NSString *)word {
+    if (![word isKindOfClass:NSString.class]) { return @""; }
+    NSString *value = [[word stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]
+        lowercaseString];
+    if (value.length == 0) { return @""; }
+    value = [value stringByFoldingWithOptions:NSDiacriticInsensitiveSearch
+                                       locale:[NSLocale currentLocale]];
+    NSMutableCharacterSet *trimSet = [[NSCharacterSet punctuationCharacterSet] mutableCopy];
+    [trimSet formUnionWithCharacterSet:[NSCharacterSet symbolCharacterSet]];
+    return [value stringByTrimmingCharactersInSet:trimSet];
+}
+
++ (NSSet<NSString *> *)kb_blockedSuggestionWords {
+    static NSSet<NSString *> *words = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        // 上架合规优先：过滤常见成人、露骨性行为、毒品、暴力武器等高风险词。
+        words = [NSSet setWithArray:@[
+            @"sex", @"sexy", @"porn", @"porno", @"xxx", @"nude", @"naked",
+            @"fuck", @"fucking", @"shit", @"bitch", @"penis", @"vagina",
+            @"boob", @"rape", @"cocaine", @"heroin", @"drug", @"drugs",
+            @"kill", @"murder", @"gun", @"weapon",
+            @"sexo", @"porno", @"pornografia", @"violacion", @"violacao",
+            @"drogas", @"cocaina", @"heroina", @"arma", @"matar", @"muerte",
+            @"pene",
+            @"色情", @"裸露", @"裸体", @"裸聊", @"裸照",
+            @"强奸", @"毒品", @"海洛因", @"可卡因",
+            @"枪", @"武器", @"杀人", @"谋杀"
+        ]];
+    });
+    return words;
+}
+
++ (NSArray<NSString *> *)kb_blockedSuggestionFragments {
+    static NSArray<NSString *> *fragments = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        fragments = @[
+            @"porn", @"fuck", @"rape", @"cocaine", @"heroin",
+            @"色情", @"裸聊", @"裸照", @"强奸", @"毒品", @"杀人"
+        ];
+    });
+    return fragments;
+}
+
 @end