text: #!/usr/bin/env python3
  # Copyright (c) 2016-2019 Savoir-faire Linux Inc.
  # Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation; either version 3 of the License, or
  # (at your option) any later version.
  #
  # This program is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program; If not, see <http://www.gnu.org/licenses/>.
  
  from twisted.web import server, resource
  from twisted.internet import reactor, endpoints
  from urllib.parse import urlparse
  
  import opendht as dht
  import base64, json
  
  class DhtServer(resource.Resource):
      isLeaf = True
      node = dht.DhtRunner()
  
      def __init__(self, port, bootstrap):
          self.node.run(port=port)
          b_url = urlparse('//'+bootstrap)
          self.node.bootstrap(b_url.hostname, str(b_url.port) if b_url.port else '4222')
  
      def render_GET(self, req):
          uri = req.uri[1:].decode().rsplit('?', 1)[0]
          h = dht.InfoHash(uri.encode()) if len(uri) == 40 else dht.InfoHash.get(uri)
          w = dht.Where('WHERE '+''.join(k.decode()+'='+req.args[k][0].decode()+','
              for k in req.args.keys()
              if k in [b'id', b'user_type', b'value_type', b'owner', b'seq'])[:-1])
          print('GET', '"'+uri+'"', h, w)
          res = self.node.get(h, where=w)
          req.setHeader(b"content-type", b"application/json")
          return json.dumps({'{:x}'.format(v.id):{'base64':base64.b64encode(v.data).decode()} for v in res}).encode()
  
      def render_POST(self, req):
          uri = req.uri[1:]
          data = req.args[b'data'][0] if b'data' in req.args else None
          user_type = req.args[b'user_type'][0].decode() if b'user_type' in req.args else ""
          try:
              vid = int(req.args[b'id'][0].decode()) if b'id' in req.args else 0
          except ValueError:
              vid = 0
          if not data and b'base64' in req.args:
              data = base64.b64decode(req.args[b'base64'][0])
          h = dht.InfoHash(uri) if len(uri) == 40 else dht.InfoHash.get(uri.decode())
          print('POST', h, data)
          req.setHeader(b"content-type", b"application/json")
          if data:
              v = dht.Value(data)
              if vid != 0:
                  v.id = vid
              v.user_type = user_type
              self.node.put(h, v)
              return json.dumps({'success':True}).encode()
          else:
              req.setResponseCode(400)
              return json.dumps({'success':False, 'error':'no data parameter'}).encode()
  
  
  if __name__ == '__main__':
      import argparse
      parser = argparse.ArgumentParser(description='Launch an OpenDHT node with an HTTP control interface')
      parser.add_argument('-p', '--port', help='OpenDHT port to bind', type=int, default=4222)
      parser.add_argument('-hp', '--http-port', help='HTTP port to bind', type=int, default=8080)
      parser.add_argument('-b', '--bootstrap', help='bootstrap address', default="bootstrap.ring.cx:4222")
      args = parser.parse_args()
      endpoints.serverFromString(reactor, "tcp:"+str(args.http_port)).listen(server.Site(DhtServer(args.port, args.bootstrap)))
      reactor.run()
  