Implement JSON RPC myself.

Write my own implementation of JSON RPC and HTTP queries, because
the jsonrpc module failed to let me configure what to do with
failed HTTP authentications.

src/bitmessageqt/__init__.py

@@ -14,7 +14,7 @@ except ImportError:
 from addresses import *
 import shared
 from bitmessageui import *
-from class_namecoin import *
+from class_namecoin import namecoinConnection
 from newaddressdialog import *
 from newsubscriptiondialog import *
 from regenerateaddresses import *

src/class_namecoin.py

@@ -1,17 +1,49 @@
+# Copyright (C) 2013 by Daniel Kraft <d@domob.eu>
+# This file is part of the Bitmessage project.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import base64
 import json
-from jsonrpc import ServiceProxy, JSONRPCException
+import socket
+
+# Error thrown when the RPC call returns an error.
+class RPCError (Exception):
+    error = None
+
+    def __init__ (self, data):
+        self.error = data
 
 # This class handles the Namecoin identity integration.
-
 class namecoinConnection (object):
+    user = None
+    password = None
+    host = None
+    port = None
+    bufsize = 4096
+    queryid = 1
 
     def __init__ (self):
-        user = "daniel"
+        self.user = "daniel"
-        password = "password"
+        self.password = "password"
-        host = "localhost"
+        self.host = "localhost"
-        port = "8336"
+        self.port = "8336"
-        self.s = ServiceProxy("http://" + user + ":" + password
-                              + "@" + host + ":" + port)
 
     # Query for the bitmessage address corresponding to the given identity
     # string.  If it doesn't contain a slash, id/ is prepended.  We return
@@ -23,24 +55,86 @@ class namecoinConnection(object):
             string = "id/" + string
 
         try:
-            res = self.s.name_show(string)
+            res = self.callRPC ("name_show", [string])
-        except JSONRPCException as err:
+        except RPCError as exc:
-            if err.error["code"] == -4:
+            if exc.error["code"] == -4:
-                return ("The name '" + string + "' was not found.", None)
+                return ("The name '%s' was not found." % string, None)
             else:
-                return ("The namecoin query failed ("
+                return ("The namecoin query failed (%s)" % exc.error["message"],
-                        + err.error["message"] + ")", None)
+                        None)
-        except:
+        except Exception as exc:
+            print "Namecoin query exception: %s" % str (exc)
             return ("The namecoin query failed.", None)
 
         try:
-            print res["value"]
             val = json.loads (res["value"])
         except:
-            return ("The name '" + string + "' has no valid JSON data.", None)
+            return ("The name '%s' has no valid JSON data." % string, None)
 
         if "bitmessage" in val:
             return (None, val["bitmessage"])
 
-        return ("The name '" + string
+        return ("The name '%s' has no associated Bitmessage address." % string,
-                + "' has no associated Bitmessage address.", None)
+                None)
+
+    # Helper routine that actually performs an JSON RPC call.
+    def callRPC (self, method, params):
+        data = {"method": method, "params": params, "id": self.queryid}
+        resp = self.queryHTTP (json.dumps (data))
+        val = json.loads (resp)
+
+        if val["id"] != self.queryid:
+            raise Exception ("ID mismatch in JSON RPC answer.")
+        self.queryid = self.queryid + 1
+
+        if val["error"] is not None:
+            raise RPCError (val["error"])
+
+        return val["result"]
+
+    # Query the server via HTTP.
+    def queryHTTP (self, data):
+        header = "POST / HTTP/1.1\n"
+        header += "User-Agent: bitmessage\n"
+        header += "Host: %s\n" % self.host
+        header += "Content-Type: application/json\n"
+        header += "Content-Length: %d\n" % len (data)
+        header += "Accept: application/json\n"
+        authstr = "%s:%s" % (self.user, self.password)
+        header += "Authorization: Basic %s\n" % base64.b64encode (authstr)
+
+        resp = self.queryServer ("%s\n%s" % (header, data))
+        lines = resp.split ("\r\n")
+        result = None
+        body = False
+        for line in lines:
+            if line == "" and not body:
+                body = True
+            elif body:
+                if result is not None:
+                    raise Exception ("Expected a single line in HTTP response.")
+                result = line
+
+        return result
+
+    # Helper routine sending data to the RPC server and returning the result.
+    def queryServer (self, data):
+        try:
+            s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
+            s.setsockopt (socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            s.connect ((self.host, int (self.port)))
+            s.sendall (data)
+            result = ""
+
+            while True:
+                tmp = s.recv (self.bufsize)
+                if not tmp:
+                  break
+                result += tmp
+
+            s.close ()
+
+            return result
+
+        except socket.error as exc:
+            raise Exception ("Socket error in RPC connection: %s" % str (exc))