diff --git a/zxxk_dl/json.drawio b/zxxk_dl/json.drawio
new file mode 100644
index 0000000..747e1b1
--- /dev/null
+++ b/zxxk_dl/json.drawio
@@ -0,0 +1 @@
+<mxfile host="Electron" modified="2023-03-12T07:30:24.882Z" agent="5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/18.0.1 Chrome/100.0.4896.143 Electron/18.2.0 Safari/537.36" etag="82TSt2pg6ExYW7F0cBMx" version="18.0.1" type="device"><diagram id="JlMTTUAl3hiSqVjWN_ON" name="第 1 页">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</diagram></mxfile>
\ No newline at end of file
diff --git a/zxxk_dl/main.py b/zxxk_dl/main.py
index 32cc118..eff3a92 100644
--- a/zxxk_dl/main.py
+++ b/zxxk_dl/main.py
@@ -1,5 +1,4 @@
 import requests
-from time import strftime
 from re import findall, sub
 from hashlib import md5
 
diff --git a/zxxk_dl/process.md b/zxxk_dl/process.md
new file mode 100644
index 0000000..60f3ccc
--- /dev/null
+++ b/zxxk_dl/process.md
@@ -0,0 +1,213 @@
+# 对于某网站预览文档分析
+
+Released in [52pojie](https://www.52pojie.cn/thread-1757323-1-1.html)
+
+## 背景
+
+某网站资源页面存在预览，有的只有部分，有的能显示全部。对于文字版文档，文件是矢量版，看起来效果很好。
+
+## 预览数据抓包
+
+在页面内打开一个没有打开的文档，抓包找到大量svg文件请求：
+
+链接（已隐藏部分数据）：
+
+```url
+https://preview.*****.com/resource/oss/preview/rbm-preview-product/rbm/*******/svg/6.svg?Expires=167*****11&Signature=qK47**********rYq43G6Q%3D
+```
+
+将抓包数据导入apifox，删除cookie和header测试是否存在验证，结果证明不存在除了url param外的其他认证。
+
+## 寻找根源请求数据
+
+上文已经找到了每一页预览的请求，但是由于`Signature`的存在还是无法实现自动请求。刷新页面，搜索上述链接可能的关键词`preview`。
+
+观察到有一个疑似请求：
+
+```url
+https://www.****.com/soft/Preview/FirstLoadPreviewJson?softID=33****78&fileaddress=&type=3&product=1&v=2&FullPreview=false
+```
+
+响应内容是一个json：
+
+```json
+{
+    "code": 0,
+    "success": false,
+    "data": {
+        "IsSuccess": true,
+        "IsRar": true,
+        "SoftExt": null,
+        "Html": "\r\n\u003cstyle\u003e\r\n  {{请求内容过长忽略}}  \u003e\r\nHHHHHHisrar",
+        "PreviewPage": 0,
+        "TotalPage": 0,
+        "rarPreviewInfo": [
+            {
+                "FileId": 38****99,
+                "Html": "\r\n\u003cdiv class=\"multiple-date-preview-file\" data-index=\"3****499\"\u003e\r\n    \u003cdiv class=\"preview-main\"\u003e\r\n        \r\n        \u003cimg data-original=\"https://preview.***.com/resource/oss/preview/rbm-preview-product/rbm/38****99/svg/1.svg?Expires=1678604711\u0026Signature=7w%2BPVktPi********5Lha0%3D\" onselectstart=\"return false\" /\u003e\u003cimg data-original=\"https://preview.***.com/resource/oss/preview/rbm-preview-product/rbm/38****99/svg/2.svg?Expires=16****4711\u0026Signature=zt20********BQ1RGZDlTaB0%3D\" onselectstart=\"return false\" /\u003e\u003c  {{以下存在类似内容，忽略}}    \u003c/div\u003e\r\n\u003c/div\u003e\r\n\u003cscript\u003e\r\n    document.oncontextmenu = function () {\r\n        window.event.returnValue = false;\r\n    };\r\n    var pageNum = 9;\r\n    var hasPreview = true;\r\n    if (pageNum \u0026\u0026 window.setDocumentPageNum) {\r\n        window.setDocumentPageNum(pageNum, hasPreview);\r\n    }\r\n\u003c/script\u003e\r\n\r\n",
+                "SoftName": "************.docx",
+                "IconClassName": "icon-doc-doc",
+                "TotalPage": 9,
+                "PreviewPage": 9,
+                "IsMedia": false,
+                "Url": null
+            },
+            {
+                "FileId": 3****500,
+                "Html": "{{类似上文}}",
+                "SoftName": "********.docx",
+                "IconClassName": "icon-doc-doc",
+                "TotalPage": 5,
+                "PreviewPage": 5,
+                "IsMedia": false,
+                "Url": null
+            }
+        ]
+    },
+    "msg": "预览错误",
+    "message": null
+}
+```
+
+PS：上文中的`"msg": "预览错误"`对任意都相同，忽略。
+
+经分析，上文的第一个`Html`内容基本无效，都时限制用户的脚本。
+`rarPreviewInfo`中的`Html`内容格式化后如下：
+
+```html
+<div class="multiple-date-preview-file" data-index="38****99">
+    <div class="preview-main">
+
+        <img
+            data-original="https://preview.***.com/resource/oss/preview/rbm-preview-product/rbm/38****99/svg/1.svg?Expires=167****711&Signature=7w%2************86WF5Lha0%3D"
+            onselectstart="return false"
+        />
+        <img
+            data-original="https://preview.***.com/resource/oss/preview/rbm-preview-product/rbm/38****99/svg/2.svg?Expires=167****711&Signature=zt206U***********1RGZDlTaB0%3D"
+            onselectstart="return false"
+        />
+        <!-- {{以下类似内容忽略}} -->
+    </div>
+</div>
+<script>
+    document.oncontextmenu = function () {
+        window.event.returnValue = false;
+    };
+    var pageNum = 9;
+    var hasPreview = true;
+    if (pageNum && window.setDocumentPageNum) {
+        window.setDocumentPageNum(pageNum, hasPreview);
+    }
+</script>
+```
+
+显然，preview链接被直接返回了，经检验该链接可以直接请求。
+最后导入apifox验证后可以确定无需特殊headers或cookies。
+
+## 最小化请求链接和寻找相关参数
+
+当前链接参数：
+
+SoftID可以直接在文档页面的链接中可以找到：
+
+```url
+https://www.****.com/soft/33****78.html
+```
+
+上文的`33****78`即为softID
+
+`type`, `product`, `v`参数不知道用途，对任意文档都是相同的，疑似网站作者还没有实现，直接引用原文了。
+
+`FullPreview`原本是`false`，改为`true`就直接返回全部内容的预览了.....
+
+## 分析返回的json
+
+测试了多个文档后确定一下结论：
+
+## demo代码
+
+**代码无法运行，因为关键域名被"\*"替代**
+
+```python
+import requests
+from re import findall, sub
+from hashlib import md5
+
+HTML_FORMAT ='''
+<html>
+
+<head>
+<title>{title}</title>
+</head>
+
+<body>
+{body}
+</body>
+
+</html>
+'''
+
+def writefile(filename,text):
+    filename = sub(r"""[\*\/\\\|\<\>\? \:\.\'\"\!]""", "", filename)
+    unique = md5(text.encode())
+    filename += "_"+unique.hexdigest()[:5]
+    filename+=".html"
+    print("Writing "+filename)
+    # print("-=-=-=-=\n",text,"\n-=-=-=-=")
+    with open(filename+'.html', 'w', encoding="utf-8") as f:
+        f.write(text)
+
+
+def main():
+    softID=input("ID: ")
+    url = "https://www.*******.com/soft/Preview/FirstLoadPreviewJson?softID={}&type=3&product=1&v=2&FullPreview=true"
+    response = requests.get(url.format(softID))
+    if response.status_code!=200:
+        print("ERROR")
+        print(response.status_code)
+        return -1
+    ret=response.json()["data"]
+    if not ret["IsSuccess"]:
+        print("ERROR: IsSuccess option is not true")
+        print(ret)
+    if not ret['IsRar']:
+        print("Not rar")
+        print("TotalPage=%d" % ret['TotalPage'])
+        print("SoftExt=%s" % ret['SoftExt'])
+        try:
+            html=ret["Html"]
+            print(ret)
+        except:
+            print(ret)
+            exit(1)
+        # replace "data-original" to "src" for showing in browser
+        html=html.replace("data-original", "src")
+        writefile(f"{softID}",html)
+    else:
+        print("is RAR")
+        rar=ret['rarPreviewInfo']
+        for file in rar:
+            html=file["Html"]
+            title=file["SoftName"]
+            # replace "data-original" to "src" for showing in browser
+            # html=html.replace("data-original", "src")
+            urls=findall("(?<=data-original=\")https://preview.*******.com/\\S+(?=\")",html)
+            l=[]
+            for url in urls:
+                if "jpg" in url:
+                    l.append(f"<img src={url} />")
+                    continue
+                page=requests.get(url,cookies=response.cookies)
+                if not page.status_code==200:
+                    print(page)
+                    print(page.status_code)
+                    print(page.text)
+                assert page.status_code==200
+                l.append(page.text)
+            format_html=HTML_FORMAT.format(title=title,body="\n".join(l))
+            writefile(title,format_html)
+
+if __name__  == "__main__":
+    while True:
+        main()
+```
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