python: add HTTP server to access the DHT

python/tools/http_server.py

+#!/usr/bin/env python3
+# Copyright (c) 2016 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
+
+import opendht as dht
+import base64, json
+
+class DhtServer(resource.Resource):
+    isLeaf = True
+    node = dht.DhtRunner()
+
+    def __init__(self):
+        self.node.run()
+        self.node.bootstrap("bootstrap.ring.cx", "4222")
+
+    def render_GET(self, req):
+        uri = req.uri[1:]
+        h = dht.InfoHash(uri) if len(uri) == 40 else dht.InfoHash.get(uri.decode())
+        print('GET', h)
+        res = self.node.get(h)
+        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
+        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:
+            self.node.put(h, dht.Value(data))
+            return json.dumps({'success':True}).encode()
+        else:
+            req.setResponseCode(400)
+            return json.dumps({'success':False, 'error':'no data parameter'}).encode()
+
+endpoints.serverFromString(reactor, "tcp:8080").listen(server.Site(DhtServer()))
+reactor.run()