feat: auto-convert URL to QR code in PDF export and preview

app/services/pdf_generator.py

@@ -53,6 +53,26 @@ try:
 except Exception as e:
     CHINESE_FONT_OK = False
 
+import re
+import qrcode
+from io import BytesIO
+from reportlab.platypus import Image as RLImage
+
+# URL 正则表达式
+URL_PATTERN = re.compile(r'https?://[^\s<>"{}|\\^`\[\]]+')
+
+def generate_qr_image(url, size=50*mm):
+    """生成二维码图片，返回 BytesIO 对象"""
+    qr = qrcode.make(url, box_size=10)
+    buf = BytesIO()
+    qr.save(buf, format='PNG')
+    buf.seek(0)
+    return buf
+
+def contains_url(text):
+    """检测文本是否包含 URL"""
+    return bool(URL_PATTERN.search(text))
+
 def md_to_xml(text):
     """将markdown转换为reportlab XML markup"""
     if not text:
@@ -169,9 +189,27 @@ class PianoPDF:
             self.elements.append(Paragraph(md_to_xml(text), self.heading_style))
 
     def add_paragraph(self, text):
-        if text:
-            self.elements.append(Paragraph(md_to_xml(text), self.body_style))
-            self.elements.append(Spacer(1, 1*mm))
+        if not text:
+            return
+
+        # 检测是否是纯 URL
+        url_match = URL_PATTERN.match(text.strip())
+        if url_match and url_match.group() == text.strip():
+            # 纯 URL，生成二维码
+            url = url_match.group()
+            try:
+                buf = generate_qr_image(url, 50*mm)
+                img = RLImage(buf, width=50*mm, height=50*mm)
+                img.hAlign = 'CENTER'
+                self.elements.append(img)
+                self.elements.append(Spacer(1, 2*mm))
+                return
+            except Exception as e:
+                # QR生成失败，回退到文字
+                pass
+
+        self.elements.append(Paragraph(md_to_xml(text), self.body_style))
+        self.elements.append(Spacer(1, 1*mm))
 
     def add_list(self, items):
         for item in items: