From 2718e47ca084ac8feea4ae58c13cb2049ad409dd Mon Sep 17 00:00:00 2001
From: Alexander Butenko <a.butenka@gmail.com>
Date: Fri, 9 Oct 2009 17:06:32 +0200
Subject: [PATCH] Add a DNS prefetching extension which fetches hovered links

---
 extensions/dnsprefetch.c | 152 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 extensions/dnsprefetch.c

diff --git a/extensions/dnsprefetch.c b/extensions/dnsprefetch.c
new file mode 100644
index 00000000..326050cb
--- /dev/null
+++ b/extensions/dnsprefetch.c
@@ -0,0 +1,152 @@
+/*
+ Copyright (C) 2009 Alexander Butenko <a.butenka@gmail.com>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+*/
+
+#include <midori/midori.h>
+
+#include "config.h"
+
+#include <glib/gstdio.h>
+#if HAVE_UNISTD_H
+    #include <unistd.h>
+#endif
+
+#define MAXHOSTS 50
+static gchar* hosts = NULL;
+static int host_count;
+
+static void
+dnsprefetch_do_prefetch (WebKitWebView *web_view,
+                         gchar         *title,
+                         gchar         *uri,
+                         gpointer       user_data)
+{
+    SoupURI* s_uri;
+
+     /* FIXME: Ignore IP addresses */
+     if (!(uri && g_str_has_prefix (uri, "http")))
+         return;
+
+     s_uri = soup_uri_new (uri);
+     if (!g_regex_match_simple (s_uri->host, hosts,
+                                G_REGEX_CASELESS, G_REGEX_MATCH_NOTEMPTY))
+     {
+         SoupAddress* address;
+         gchar* new_hosts;
+
+         address = soup_address_new (s_uri->host, SOUP_ADDRESS_ANY_PORT);
+         soup_address_resolve_async (address, 0, 0, 0, 0);
+         g_object_unref (address);
+
+         if (host_count > MAXHOSTS)
+         {
+             katze_assign (hosts, g_strdup (""));
+             host_count = 0;
+         }
+         host_count++;
+         new_hosts = g_strdup_printf ("%s|%s", hosts, s_uri->host);
+         katze_assign (hosts, new_hosts);
+     }
+     soup_uri_free (s_uri);
+}
+
+static void
+dnsprefetch_add_tab_cb (MidoriBrowser* browser,
+                        MidoriView*    view)
+{
+    GtkWidget* web_view = gtk_bin_get_child (GTK_BIN (view));
+    g_signal_connect (web_view, "hovering-over-link",
+            G_CALLBACK (dnsprefetch_do_prefetch), 0);
+}
+
+static void
+dnsprefetch_deactivate_cb (MidoriExtension* extension,
+                           MidoriBrowser*   browser);
+
+static void
+dnsprefetch_add_tab_foreach_cb (MidoriView*    view,
+                                MidoriBrowser* browser)
+{
+    dnsprefetch_add_tab_cb (browser, view);
+}
+
+static void
+dnsprefetch_app_add_browser_cb (MidoriApp*       app,
+                                MidoriBrowser*   browser,
+                                MidoriExtension* extension)
+{
+    midori_browser_foreach (browser,
+        (GtkCallback)dnsprefetch_add_tab_foreach_cb, browser);
+    g_signal_connect (browser, "add-tab",
+        G_CALLBACK (dnsprefetch_add_tab_cb), 0);
+    g_signal_connect (extension, "deactivate",
+        G_CALLBACK (dnsprefetch_deactivate_cb), browser);
+}
+
+static void
+dnsprefetch_deactivate_tabs (MidoriView*    view,
+                             MidoriBrowser* browser)
+{
+    GtkWidget* web_view = gtk_bin_get_child (GTK_BIN (view));
+    g_signal_handlers_disconnect_by_func (
+       browser, dnsprefetch_add_tab_cb, 0);
+    g_signal_handlers_disconnect_by_func (
+       web_view, dnsprefetch_do_prefetch, 0);
+}
+
+static void
+dnsprefetch_deactivate_cb (MidoriExtension* extension,
+                       MidoriBrowser*   browser)
+{
+    MidoriApp* app = midori_extension_get_app (extension);
+
+    katze_assign (hosts, g_strdup (""));
+    host_count = 0;
+
+    g_signal_handlers_disconnect_by_func (
+        extension, dnsprefetch_deactivate_cb, browser);
+    g_signal_handlers_disconnect_by_func (
+        app, dnsprefetch_app_add_browser_cb, extension);
+    midori_browser_foreach (browser, (GtkCallback)dnsprefetch_deactivate_tabs, browser);
+
+}
+
+static void
+dnsprefetch_activate_cb (MidoriExtension* extension,
+                         MidoriApp*       app)
+{
+    KatzeArray* browsers;
+    MidoriBrowser* browser;
+    guint i;
+
+    host_count = 0;
+
+    browsers = katze_object_get_object (app, "browsers");
+    i = 0;
+    while ((browser = katze_array_get_nth_item (browsers, i++)))
+        dnsprefetch_app_add_browser_cb (app, browser, extension);
+    g_signal_connect (app, "add-browser",
+        G_CALLBACK (dnsprefetch_app_add_browser_cb), extension);
+
+    g_object_unref (browsers);
+}
+
+MidoriExtension*
+extension_init (void)
+{
+    MidoriExtension* extension = g_object_new (MIDORI_TYPE_EXTENSION,
+        "name", _("DNS prefetching"),
+        "description", _("Prefetch IP addresses of hovered links"),
+        "version", "0.1",
+        "authors", "Alexander V. Butenko <a.butenka@gmail.com>",
+        NULL);
+    g_signal_connect (extension, "activate",
+         G_CALLBACK (dnsprefetch_activate_cb), NULL);
+
+    return extension;
+}