kapsikkum-unmanic – Blame information for rev 1

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1 office 1 #!/usr/bin/env python3
2 # -*- coding: utf-8 -*-
3  
4 """
5 unmanic.downloads.py
6  
7 Written by: Josh.5 <jsunnex@gmail.com>
8 Date: 31 Oct 2021, (4:41 PM)
9  
10 Copyright:
11 Copyright (C) Josh Sunnex - All Rights Reserved
12  
13 Permission is hereby granted, free of charge, to any person obtaining a copy
14 of this software and associated documentation files (the "Software"), to deal
15 in the Software without restriction, including without limitation the rights
16 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
17 copies of the Software, and to permit persons to whom the Software is
18 furnished to do so, subject to the following conditions:
19  
20 The above copyright notice and this permission notice shall be included in all
21 copies or substantial portions of the Software.
22  
23 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
26 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
27 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
28 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
29 OR OTHER DEALINGS IN THE SOFTWARE.
30  
31 """
32 import os
33 import threading
34 import time
35 import uuid
36  
37 from tornado import iostream, web
38  
39 from unmanic.libs.singleton import SingletonType
40  
41  
42 class DownloadsLinks(object, metaclass=SingletonType):
43 _download_links = {}
44  
45 def __remove_expired(self):
46 """
47 Find and remove expired links
48  
49 :return:
50 """
51 time_now = time.time()
52 keys = [t for t in self._download_links]
53 lock = threading.RLock()
54 with lock:
55 for k in keys:
56 if k in self._download_links:
57 if self._download_links[k].get('expires', 0) < time_now:
58 # Item has expired. Remove this item
59 del self._download_links[k]
60  
61 def generate_download_link(self, link_data):
62 link_id = str(uuid.uuid4())
63 lock = threading.RLock()
64 with lock:
65 # Expire in 1 min
66 link_data['expires'] = (time.time() + 60)
67 self._download_links[link_id] = link_data
68 return link_id
69  
70 def get_download_link(self, link_id):
71 # Find and remove expired links
72 self.__remove_expired()
73 return self._download_links.get(link_id, {})
74  
75  
76 class DownloadsHandler(web.RequestHandler):
77  
78 async def get(self, link_id):
79  
80 # Fetch link from
81 download_links = DownloadsLinks()
82 link_data = download_links.get_download_link(link_id)
83 # Set file details
84 abspath = link_data.get('abspath', '')
85 basename = link_data.get('basename', '')
86 # Return 404 on file not found
87 if not os.path.exists(abspath):
88 # Link ID must not be valid
89 self.write_error(404)
90 return
91  
92 self.set_header('Content-Type', 'application/octet-stream')
93 self.set_header('Content-Disposition', 'attachment; filename={}'.format(basename))
94  
95 # Serve file download in 1MB chunks
96 with open(abspath, 'rb') as f:
97 while True:
98 data = f.read(1024 * 1024)
99 if not data:
100 break
101 try:
102 self.write(data)
103 await self.flush()
104 except iostream.StreamClosedError:
105 break
106 finally:
107 del data