参考文献作者堆叠

参考文献相关性检测作者ai写作辅助检测工作
2026-07-15 10:49:05 +08:00
parent da71dfc04e
commit 8785610e6d
27 changed files with 10008 additions and 204 deletions
--- a/application/common/UnpaywallService.php
+++ b/application/common/UnpaywallService.php
@@ -0,0 +1,76 @@
+<?php
+
+namespace app\common;
+
+use think\Env;
+
+/**
+ * Unpaywall OA PDF 定位
+ * @see https://unpaywall.org/products/api
+ */
+class UnpaywallService
+{
+    private $email;
+    private $timeout = 20;
+
+    public function __construct()
+    {
+        $this->email = trim((string)Env::get('unpaywall_email', Env::get('pubmed_email', '')));
+    }
+
+    /**
+     * @return string PDF 直链，找不到返回空
+     */
+    public function findOaPdfUrl($doi)
+    {
+        $doi = trim((string)$doi);
+        if ($doi === '' || $this->email === '') {
+            return '';
+        }
+
+        $url = 'https://api.unpaywall.org/v2/' . rawurlencode($doi) . '?' . http_build_query([
+            'email' => $this->email,
+        ]);
+
+        $ch = curl_init();
+        curl_setopt_array($ch, [
+            CURLOPT_URL            => $url,
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_TIMEOUT        => $this->timeout,
+            CURLOPT_SSL_VERIFYPEER => false,
+            CURLOPT_HTTPHEADER     => ['User-Agent: TMRjournals-Unpaywall/1.0'],
+        ]);
+        $raw = curl_exec($ch);
+        curl_close($ch);
+        if (!is_string($raw) || $raw === '') {
+            return '';
+        }
+
+        $json = json_decode($raw, true);
+        if (!is_array($json)) {
+            return '';
+        }
+
+        $best = $json['best_oa_location'] ?? [];
+        if (!is_array($best)) {
+            return '';
+        }
+
+        foreach (['url_for_pdf', 'url'] as $key) {
+            $candidate = trim((string)($best[$key] ?? ''));
+            if ($candidate !== '' && $this->looksLikePdfUrl($candidate)) {
+                return $candidate;
+            }
+        }
+
+        return '';
+    }
+
+    private function looksLikePdfUrl($url)
+    {
+        if (stripos($url, '.pdf') !== false) {
+            return true;
+        }
+        return (bool)preg_match('#/(pdf|download|content/pdf)#i', $url);
+    }
+}