ai写作辅助检测

2026-07-15 10:55:08 +08:00
parent c80ff9b99f
commit a46df66028
4 changed files with 695 additions and 0 deletions
--- a/application/common/AiTemplateSentenceRuleDetectService.php
+++ b/application/common/AiTemplateSentenceRuleDetectService.php
@@ -0,0 +1,168 @@
+<?php
+
+namespace app\common;
+
+use think\Db;
+
+/**
+ * 模板句规则检测（t_ai_template_sentence）
+ */
+class AiTemplateSentenceRuleDetectService
+{
+    /** @var array<int,array>|null */
+    private static $ruleCache;
+
+    /**
+     * @param array<string,string> $sectionTexts 键：abstract/introduction/...
+     * @return array{hits:array,rule_score:int}
+     */
+    public function detect(array $sectionTexts): array
+    {
+        $rules = $this->loadActiveRules();
+        $hits = [];
+        $ruleScore = 0;
+
+        $normalized = [];
+        foreach ($sectionTexts as $key => $text) {
+            $section = strtolower(trim((string) $key));
+            if ($section === '') {
+                continue;
+            }
+            $normalized[$section] = ManuscriptTextCleanService::clean((string) $text);
+        }
+        $allText = ManuscriptTextCleanService::clean(implode("\n\n", array_filter($normalized)));
+
+        foreach ($rules as $rule) {
+            $section = strtolower(trim((string) ($rule['section'] ?? '')));
+            $pattern = trim((string) ($rule['sentence_pattern'] ?? ''));
+            if ($pattern === '') {
+                continue;
+            }
+
+            $targetText = '';
+            if ($section === 'all') {
+                $targetText = $allText;
+            } elseif (isset($normalized[$section])) {
+                $targetText = $normalized[$section];
+            } else {
+                continue;
+            }
+            if ($targetText === '') {
+                continue;
+            }
+
+            $matches = $this->matchPattern($targetText, $pattern);
+            foreach ($matches as $matchedText) {
+                $sentence = $this->extractSentenceContaining($targetText, $matchedText);
+                $hitScore = max(1, intval($rule['weight'] ?? 1)) * max(1, intval($rule['risk_level'] ?? 1));
+                $hits[] = [
+                    'section'  => $section,
+                    'type'     => '模板化表达',
+                    'sentence' => $sentence !== '' ? $sentence : $matchedText,
+                    'pattern'  => $pattern,
+                    'score'    => $hitScore,
+                    'remark'   => (string) ($rule['remark'] ?? ''),
+                ];
+                $ruleScore += $hitScore;
+            }
+        }
+
+        return [
+            'hits'       => $hits,
+            'rule_score' => min(100, $ruleScore),
+        ];
+    }
+
+    /**
+     * @return array<int,array>
+     */
+    private function loadActiveRules(): array
+    {
+        if (self::$ruleCache !== null) {
+            return self::$ruleCache;
+        }
+        try {
+            self::$ruleCache = Db::name('ai_template_sentence')
+                ->where('status', 1)
+                ->field('id,sentence_pattern,section,language,risk_level,weight,remark')
+                ->order('section asc,id asc')
+                ->select();
+        } catch (\Throwable $e) {
+            self::$ruleCache = [];
+        }
+        return self::$ruleCache;
+    }
+
+    /**
+     * @return array<int,string>
+     */
+    private function matchPattern(string $text, string $pattern): array
+    {
+        // 支持 regex: 前缀；否则优先按正则，失败则按字面量匹配
+        $raw = $pattern;
+        $forceRegex = false;
+        if (stripos($pattern, 'regex:') === 0) {
+            $raw = trim(substr($pattern, 6));
+            $forceRegex = true;
+        }
+
+        $out = $this->runPregMatchAll($text, '#' . $raw . '#iu');
+        if (!empty($out) || $forceRegex) {
+            return $out;
+        }
+
+        // 字面量回退（库内普通句子）
+        return $this->runPregMatchAll($text, '#' . preg_quote($raw, '#') . '#iu');
+    }
+
+    /**
+     * @return array<int,string>
+     */
+    private function runPregMatchAll(string $text, string $regex): array
+    {
+        $error = null;
+        set_error_handler(function ($errno, $errstr) use (&$error) {
+            $error = $errstr;
+            return true;
+        });
+        $ok = preg_match_all($regex, $text, $matches);
+        restore_error_handler();
+        if ($ok === false || $error !== null || empty($matches[0])) {
+            return [];
+        }
+
+        $out = [];
+        foreach ($matches[0] as $match) {
+            $match = trim((string) $match);
+            if ($match !== '') {
+                $out[] = $match;
+            }
+        }
+        return $out;
+    }
+
+    private function extractSentenceContaining(string $text, string $needle): string
+    {
+        $pos = mb_stripos($text, $needle);
+        if ($pos === false) {
+            return '';
+        }
+
+        $before = mb_substr($text, 0, $pos);
+        $after = mb_substr($text, $pos);
+
+        $start = $before;
+        if (preg_match('/.*[.!?。！？]\s*/us', $before, $m)) {
+            $start = substr($before, strlen($m[0]));
+        }
+
+        $sentence = $start . $after;
+        if (preg_match('/^(.+?[.!?。！？])/us', $sentence, $m)) {
+            return trim($m[1]);
+        }
+        if (preg_match('/^.{1,500}/us', $sentence, $m)) {
+            return trim($m[0]);
+        }
+        return trim(mb_substr($sentence, 0, 300));
+    }
+}