feat: add upload and download function

app.py

@@ -0,0 +1,30 @@
+from flask import Flask, request, send_from_directory, abort
+import os
+
+app = Flask(__name__)
+
+UPLOAD_FOLDER = './uploads'
+os.makedirs(UPLOAD_FOLDER, exist_ok=True)
+
+@app.route('/upload', methods=['POST'])
+def upload_file():
+    if 'file' not in request.files:
+        return 'No file part'
+    
+    file = request.files['file']
+    if file.filename == '':
+        return 'No selected file'
+
+    # 保存文件到指定目录
+    file.save(os.path.join(UPLOAD_FOLDER, file.filename))
+    return 'File uploaded successfully'
+
+@app.route('/download/<filename>', methods=['GET'])
+def download_file(filename):
+    try:
+        return send_from_directory(UPLOAD_FOLDER, filename, as_attachment=True)
+    except FileNotFoundError:
+        abort(404)
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=880)