修复 word 文件预览问题

app/routes/resources.py

@@ -415,9 +415,32 @@ def preview(resource_id):
         abort(404)
 
     ext = (res.original_name or res.filename or '').rsplit('.', 1)[-1].lower()
+    mime = (res.mime_type or '').lower()
+
+    DOCX_MIME = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
+    DOC_MIME = 'application/msword'
+
+    # 部分来源（如 URL 下载）文件名没有扩展名，需用 MIME 与文件头兜底判断
+    is_docx = ext == 'docx' or mime == DOCX_MIME
+    is_doc = ext == 'doc' or mime == DOC_MIME
+    if not (is_docx or is_doc):
+        try:
+            with open(abs_path, 'rb') as f:
+                head = f.read(8)
+            # docx/xlsx/pptx 实际上是 zip：PK\x03\x04
+            if head.startswith(b'PK\x03\x04') and (
+                'wordprocessingml' in mime or 'officedocument' in mime
+            ):
+                is_docx = True
+            # 旧版 .doc 二进制头：D0 CF 11 E0 A1 B1 1A E1
+            elif head.startswith(b'\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1') and \
+                 ('msword' in mime or mime == ''):
+                is_doc = True
+        except Exception:
+            pass
 
     # Word 文档（.docx）使用 mammoth 转换为 HTML
-    if ext == 'docx':
+    if is_docx:
         try:
             import mammoth
             with open(abs_path, 'rb') as f:
@@ -437,7 +460,7 @@ def preview(resource_id):
             )
 
     # 旧版 .doc 二进制格式不支持在线预览
-    if ext == 'doc':
+    if is_doc:
         return Response(
             '<div style="padding:1rem;color:#6c757d">'
             '不支持在线预览旧版 .doc 文件，请下载后查看，或将文件转换为 .docx 格式。</div>',

app/templates/user/detail.html

@@ -157,7 +157,11 @@
           {% elif resource.resource_type == 'text' %}
           {%- set _name = (resource.original_name or resource.filename or '') -%}
           {%- set _ext = _name.rsplit('.', 1)[-1].lower() if '.' in _name else '' -%}
-          {% if _ext in ('doc', 'docx') %}
+          {%- set _mime = (resource.mime_type or '')|lower -%}
+          {%- set _is_word = _ext in ('doc', 'docx')
+                or 'wordprocessingml' in _mime
+                or _mime == 'application/msword' -%}
+          {% if _is_word %}
           <div class="text-preview-toolbar p-2 border-bottom d-flex gap-2 align-items-center">
             <i class="bi bi-file-earmark-word text-primary"></i>
             <span class="small text-muted">Word 文档预览</span>
@@ -212,7 +216,11 @@
 {% if resource.resource_type == 'text' and resource.file_path and resource.download_status in ('na','done') %}
 {%- set _name = (resource.original_name or resource.filename or '') -%}
 {%- set _ext = _name.rsplit('.', 1)[-1].lower() if '.' in _name else '' -%}
-{% if _ext in ('doc', 'docx') %}
+{%- set _mime = (resource.mime_type or '')|lower -%}
+{%- set _is_word = _ext in ('doc', 'docx')
+      or 'wordprocessingml' in _mime
+      or _mime == 'application/msword' -%}
+{% if _is_word %}
 // Word 文档：服务端已转换为 HTML，直接渲染
 fetch("{{ url_for('resources.preview', resource_id=resource.id) }}")
   .then(r => r.text())