Add simple webapp to upload files

webapp/app.py

@@ -0,0 +1,57 @@
+from flask import Flask, render_template, request
+import socket
+from struct import pack, unpack
+import hashlib
+import sys
+
+PORT = 8989
+
+files = []
+
+app = Flask(__name__)
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+@app.route('/upload', methods=['POST'])
+def upload():
+    if 'file' not in request.files:
+        return 'No file part'
+    file = request.files['file']
+    if file.filename == '':
+        return 'No selected file'
+    
+    buf = file.read()
+    hash = hashlib.sha256(buf).digest()
+    
+    # Scan file
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    s.settimeout(10)
+    s.connect(("localhost", PORT))
+
+    s.send(pack("I", len(buf)))
+    s.send(buf)
+
+    try:
+        recv_hash = s.recv(32)
+        status = unpack("B", s.recv(1))
+
+        if (hash != recv_hash):
+            message = 'Error: Mismatching sha256.'
+        
+        elif (status == 1):
+            message = "Error: Potential virus found, cannot upload."
+
+        else:
+            message = 'File successfully uploaded'
+            files.append({'filename': file.filename, 'content':buf})
+
+    except:
+        message = 'Error: Failed to scan file'
+
+    s.close()
+    return message
+
+if __name__ == '__main__':
+    app.run(debug=True)