[banshee] Add support for using the GNOME proxy settings

[Aaron Bockover <abock src gnome org>]

commit ebb43a8a21bd8bcf37b4b9b5881cbfbf49e57887
Author: Iain Lane <laney ubuntu com>
Date:   Sat May 22 20:55:19 2010 +0100

    Add support for using the GNOME proxy settings
    
    Read GNOME's proxy settings from GConf and use them to make HTTP
    requests. Unfortunately there doesn't seem to be a way to parse PAC
    (autoconfig) files, so these aren't supported.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=619856
    
    Signed-off-by: Aaron Bockover <abockover novell com>

 src/Backends/Banshee.Gnome/Banshee.Gnome.csproj    |    1 +
 .../GConfConfigurationClient.cs                    |    9 ++
 .../Banshee.GnomeBackend/GConfProxy.cs             |  124 ++++++++++++++++++++
 .../Banshee.GnomeBackend/GnomeService.cs           |    3 +
 src/Backends/Banshee.Gnome/Makefile.am             |    1 +
 5 files changed, 138 insertions(+), 0 deletions(-)
---
diff --git a/src/Backends/Banshee.Gnome/Banshee.Gnome.csproj b/src/Backends/Banshee.Gnome/Banshee.Gnome.csproj
index 0afdb05..9ee6384 100644
--- a/src/Backends/Banshee.Gnome/Banshee.Gnome.csproj
+++ b/src/Backends/Banshee.Gnome/Banshee.Gnome.csproj
@@ -90,6 +90,7 @@
     <Compile Include="Banshee.GnomeBackend\Brasero.cs" />
     <Compile Include="Banshee.GnomeBackend\DiscDuplicator.cs" />
     <Compile Include="Banshee.GnomeBackend\GnomeScreensaverManager.cs" />
+    <Compile Include="Banshee.GnomeBackend\GConfProxy.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Banshee.Gnome.addin.xml">
diff --git a/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GConfConfigurationClient.cs b/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GConfConfigurationClient.cs
index 69635b3..844249f 100644
--- a/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GConfConfigurationClient.cs
+++ b/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GConfConfigurationClient.cs
@@ -77,6 +77,15 @@ namespace Banshee.GnomeBackend
             }
         }
 
+        public void AddCallback (string @namespace, NotifyEventHandler callback)
+        {
+            if (DisableGConf || @namespace == null) {
+                return;
+            }
+
+            client.AddNotify(@namespace, callback);
+        }
+
         private string CreateKey (string @namespace, string part)
         {
             string hash_key = String.Concat (@namespace, part);
diff --git a/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GConfProxy.cs b/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GConfProxy.cs
new file mode 100644
index 0000000..5fdff82
--- /dev/null
+++ b/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GConfProxy.cs
@@ -0,0 +1,124 @@
+// 
+// GConfProxy.cs
+// 
+// Author:
+//   Iain Lane <laney ubuntu com>
+// 
+// Copyright 2010 Iain Lane
+// 
+// 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.
+
+using System;
+using System.Net;
+
+using Hyena;
+
+using Banshee.Configuration;
+
+namespace Banshee.GnomeBackend
+{
+    public class GConfProxy
+    {
+        const string PROXY = "/system/http_proxy";
+        const string PROXY_USE_PROXY = "use_http_proxy";
+        const string PROXY_USE_AUTH = "use_authentication";
+        const string PROXY_HOST = "host";
+        const string PROXY_PORT = "port";
+        const string PROXY_USER = "authentication_user";
+        const string PROXY_PASSWORD = "authentication_password";
+        const string PROXY_BYPASS_LIST = "ignore_hosts";
+
+        private bool use_proxy, use_auth;
+        private string proxy_host, proxy_user, proxy_password;
+        private int proxy_port;
+        private string[] proxy_bypass_list;
+
+        private GConfConfigurationClient gconf_configuration_client;
+
+        public GConfProxy ()
+        {
+            gconf_configuration_client = new GConfConfigurationClient ();
+
+            // Set them up the initial DefaultWebProxy
+            System.Net.HttpWebRequest.DefaultWebProxy = GetProxyFromGConf ();
+
+            // And hook up a callback so that we get notified of any changes in the proxy settings
+            AddCallback ();
+        }
+
+        private void AddCallback ()
+        {
+            gconf_configuration_client.AddCallback (PROXY, new GConf.NotifyEventHandler(OnProxyChanged));
+        }
+
+        private void OnProxyChanged (object sender, GConf.NotifyEventArgs args)
+        {
+            Log.Debug ("Updating web proxy");
+            HttpWebRequest.DefaultWebProxy = GetProxyFromGConf ();
+        }
+
+        private WebProxy GetProxyFromGConf ()
+        {
+            // Read the settings in from GConf
+            use_proxy = gconf_configuration_client.Get<bool> (PROXY, PROXY_USE_PROXY, false);
+            use_auth = gconf_configuration_client.Get<bool> (PROXY,  false);
+            proxy_host = gconf_configuration_client.Get<string> (PROXY, PROXY_HOST, null);
+            proxy_port = gconf_configuration_client.Get<int> (PROXY, PROXY_PORT, 0);
+            proxy_user = gconf_configuration_client.Get<string> (PROXY,  null);
+            proxy_password = gconf_configuration_client.Get<string> (PROXY, null);
+            proxy_bypass_list = gconf_configuration_client.Get<string[]> (PROXY, PROXY_BYPASS_LIST, new string[0]);
+
+            WebProxy proxy = new WebProxy ();
+
+            // No proxy set, just return the empty proxy
+            if (!use_proxy || proxy_host == null) {
+                Log.Debug ("No proxy in use");
+                return proxy;
+            }
+
+            // otherwise we have a proxy. Let's get this show on the road.
+
+            // First we need to construct the uri of the proxy
+
+            string uri = String.Format ("http://{0}:{1}";, proxy_host, proxy_port);
+            proxy.Address = new Uri (uri);
+
+            // Next the list of websites to bypass the proxy for.
+            foreach (string host in proxy_bypass_list) {
+                if (host.Contains ("*.local")) {
+                    proxy.BypassProxyOnLocal = true;
+                    continue;
+                }
+
+                proxy.BypassArrayList.Add (string.Format ("http://{0}";, host));
+            }
+
+            // and finally we might need to authenticate, so let's do that
+            if (use_auth) {
+                proxy.Credentials = new NetworkCredential (proxy_user, proxy_password);
+            } else {
+                proxy.Credentials = null;
+            }
+
+            Log.Debug (String.Format ("Set web proxy to: {0}", proxy.Address.AbsoluteUri));
+
+            return proxy;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GnomeService.cs b/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GnomeService.cs
index 44002d9..d2b3f4c 100644
--- a/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GnomeService.cs
+++ b/src/Backends/Banshee.Gnome/Banshee.GnomeBackend/GnomeService.cs
@@ -49,6 +49,9 @@ namespace Banshee.GnomeBackend
             try {
                 brasero = new Brasero ();
                 brasero.Initialize ();
+
+                new GConfProxy ();
+
             } catch {
                 brasero = null;
             }
diff --git a/src/Backends/Banshee.Gnome/Makefile.am b/src/Backends/Banshee.Gnome/Makefile.am
index f809f36..a06dbc9 100644
--- a/src/Backends/Banshee.Gnome/Makefile.am
+++ b/src/Backends/Banshee.Gnome/Makefile.am
@@ -7,6 +7,7 @@ SOURCES =  \
 	Banshee.GnomeBackend/Brasero.cs \
 	Banshee.GnomeBackend/DiscDuplicator.cs \
 	Banshee.GnomeBackend/GConfConfigurationClient.cs \
+	Banshee.GnomeBackend/GConfProxy.cs \
 	Banshee.GnomeBackend/GnomeScreensaverManager.cs \
 	Banshee.GnomeBackend/GnomeService.cs