[banshee] [WebBrowser] Bind nav and resource request callbacks

[Gabriel Burt <gburt src gnome org>]

commit d393e2992430bb9fee61d24c42468fffc6d20475
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Tue Jul 13 20:36:35 2010 -0700

    [WebBrowser] Bind nav and resource request callbacks
    
    With these you can reject navigation requests and reject or redirect
    resource (eg images in a page) requests.

 .../Banshee.WebBrowser/OssiferWebView.cs           |   32 +++++++++-
 .../libossifer/ossifer-web-view.c                  |   65 +++++++++++++++++++-
 2 files changed, 95 insertions(+), 2 deletions(-)
---
diff --git a/src/Core/Banshee.WebBrowser/Banshee.WebBrowser/OssiferWebView.cs b/src/Core/Banshee.WebBrowser/Banshee.WebBrowser/OssiferWebView.cs
index 61e3c27..0e5a4e1 100644
--- a/src/Core/Banshee.WebBrowser/Banshee.WebBrowser/OssiferWebView.cs
+++ b/src/Core/Banshee.WebBrowser/Banshee.WebBrowser/OssiferWebView.cs
@@ -32,7 +32,9 @@ namespace Banshee.WebBrowser
     public class OssiferWebView : Gtk.Widget
     {
         private delegate OssiferNavigationResponse MimeTypePolicyDecisionRequestedCallback (IntPtr ossifer, IntPtr mimetype);
+        private delegate OssiferNavigationResponse NavigationPolicyDecisionRequestedCallback (IntPtr ossifer, IntPtr uri);
         private delegate IntPtr DownloadRequestedCallback (IntPtr ossifer, IntPtr mimetype, IntPtr uri, IntPtr suggested_filename);
+        private delegate IntPtr ResourceRequestStartingCallback (IntPtr ossifer, IntPtr uri);
         private delegate void LoadStatusChangedCallback (IntPtr ossifer, OssiferLoadStatus status);
         private delegate void DownloadStatusChangedCallback (IntPtr ossifer, OssiferDownloadStatus status, IntPtr mimetype, IntPtr destnation_uri);
 
@@ -40,7 +42,9 @@ namespace Banshee.WebBrowser
         private struct Callbacks
         {
             public MimeTypePolicyDecisionRequestedCallback MimeTypePolicyDecisionRequested;
+            public NavigationPolicyDecisionRequestedCallback NavigationPolicyDecisionRequested;
             public DownloadRequestedCallback DownloadRequested;
+            public ResourceRequestStartingCallback ResourceRequestStarting;
             public LoadStatusChangedCallback LoadStatusChanged;
             public DownloadStatusChangedCallback DownloadStatusChanged;
         }
@@ -73,7 +77,10 @@ namespace Banshee.WebBrowser
             callbacks = new Callbacks () {
                 MimeTypePolicyDecisionRequested =
                     new MimeTypePolicyDecisionRequestedCallback (HandleMimeTypePolicyDecisionRequested),
+                NavigationPolicyDecisionRequested =
+                    new NavigationPolicyDecisionRequestedCallback (HandleNavigationPolicyDecisionRequested),
                 DownloadRequested = new DownloadRequestedCallback (HandleDownloadRequested),
+                ResourceRequestStarting = new ResourceRequestStartingCallback (HandleResourceRequestStarting),
                 LoadStatusChanged = new LoadStatusChangedCallback (HandleLoadStatusChanged),
                 DownloadStatusChanged = new DownloadStatusChangedCallback (HandleDownloadStatusChanged)
             };
@@ -93,6 +100,16 @@ namespace Banshee.WebBrowser
             return OssiferNavigationResponse.Unhandled;
         }
 
+        private OssiferNavigationResponse HandleNavigationPolicyDecisionRequested (IntPtr ossifer, IntPtr mimetype)
+        {
+            return OnNavigationPolicyDecisionRequested (GLib.Marshaller.Utf8PtrToString (mimetype));
+        }
+
+        protected virtual OssiferNavigationResponse OnNavigationPolicyDecisionRequested (string mimetype)
+        {
+            return OssiferNavigationResponse.Unhandled;
+        }
+
         private IntPtr HandleDownloadRequested (IntPtr ossifer, IntPtr mimetype, IntPtr uri, IntPtr suggested_filename)
         {
             var destination_uri = OnDownloadRequested (
@@ -109,6 +126,19 @@ namespace Banshee.WebBrowser
             return null;
         }
 
+        private IntPtr HandleResourceRequestStarting (IntPtr ossifer, IntPtr old_uri)
+        {
+            string new_uri = OnResourceRequestStarting (GLib.Marshaller.Utf8PtrToString (old_uri));
+            return new_uri == null
+                ? IntPtr.Zero
+                : GLib.Marshaller.StringToPtrGStrdup (new_uri);
+        }
+
+        protected virtual string OnResourceRequestStarting (string old_uri)
+        {
+            return null;
+        }
+
         private void HandleLoadStatusChanged (IntPtr ossifer, OssiferLoadStatus status)
         {
             OnLoadStatusChanged (status);
@@ -263,4 +293,4 @@ namespace Banshee.WebBrowser
 #endregion
 
     }
-}
\ No newline at end of file
+}
diff --git a/src/Core/Banshee.WebBrowser/libossifer/ossifer-web-view.c b/src/Core/Banshee.WebBrowser/libossifer/ossifer-web-view.c
index 2fda2b2..920904a 100644
--- a/src/Core/Banshee.WebBrowser/libossifer/ossifer-web-view.c
+++ b/src/Core/Banshee.WebBrowser/libossifer/ossifer-web-view.c
@@ -32,9 +32,15 @@ G_DEFINE_TYPE (OssiferWebView, ossifer_web_view, WEBKIT_TYPE_WEB_VIEW);
 typedef WebKitNavigationResponse (* OssiferWebViewMimeTypePolicyDecisionRequestedCallback)
     (OssiferWebView *ossifer, const gchar *mimetype);
 
+typedef WebKitNavigationResponse (* OssiferWebViewNavigationPolicyDecisionRequestedCallback)
+    (OssiferWebView *ossifer, const gchar *uri);
+
 typedef gchar * (* OssiferWebViewDownloadRequestedCallback)
     (OssiferWebView *ossifer, const gchar *mimetype, const gchar *uri, const gchar *suggested_filename);
 
+typedef gchar * (* OssiferWebViewResourceRequestStartingCallback)
+    (OssiferWebView *ossifer, const gchar *uri);
+
 typedef void (* OssiferWebViewDownloadStatusChanged)
     (OssiferWebView *ossifer, WebKitDownloadStatus status, const gchar *mimetype, const gchar *uri);
 
@@ -43,7 +49,9 @@ typedef void (* OssiferWebViewLoadStatusChanged)
 
 typedef struct {
     OssiferWebViewMimeTypePolicyDecisionRequestedCallback mime_type_policy_decision_requested;
+    OssiferWebViewNavigationPolicyDecisionRequestedCallback navigation_policy_decision_requested;
     OssiferWebViewDownloadRequestedCallback download_requested;
+    OssiferWebViewResourceRequestStartingCallback resource_request_starting;
     OssiferWebViewLoadStatusChanged load_status_changed;
     OssiferWebViewDownloadStatusChanged download_status_changed;
 } OssiferWebViewCallbacks;
@@ -71,6 +79,25 @@ ossifer_web_view_create_web_view (WebKitWebView *web_view, WebKitWebFrame *frame
     return WEBKIT_WEB_VIEW (g_object_new (OSSIFER_TYPE_WEB_VIEW, NULL));
 }
 
+static void
+ossifer_web_view_resource_request_starting (WebKitWebView *web_view, WebKitWebFrame *frame,
+    WebKitWebResource *resource, WebKitNetworkRequest *request,
+    WebKitNetworkResponse *response, gpointer user_data)
+{
+    OssiferWebView *ossifer = OSSIFER_WEB_VIEW (web_view);
+    const gchar *old_uri;
+    gchar *new_uri = NULL;
+
+    if (ossifer->priv->callbacks.resource_request_starting != NULL) {
+        old_uri = webkit_network_request_get_uri (request);
+        new_uri = ossifer->priv->callbacks.resource_request_starting (ossifer, old_uri);
+        if (new_uri) {
+            webkit_network_request_set_uri (request, new_uri);
+            g_free (new_uri);
+        }
+    }
+}
+
 static gboolean
 ossifer_web_view_mime_type_policy_decision_requested (WebKitWebView *web_view, WebKitWebFrame *frame,
     WebKitNetworkRequest *request, gchar *mimetype, WebKitWebPolicyDecision *policy_decision, gpointer user_data)
@@ -99,6 +126,35 @@ ossifer_web_view_mime_type_policy_decision_requested (WebKitWebView *web_view, W
     return TRUE;
 }
 
+static gboolean
+ossifer_web_view_navigation_policy_decision_requested (WebKitWebView *web_view, WebKitWebFrame *frame,
+    WebKitNetworkRequest *request, WebKitWebNavigationAction *action, WebKitWebPolicyDecision *policy_decision, gpointer user_data)
+{
+    OssiferWebView *ossifer = OSSIFER_WEB_VIEW (web_view);
+
+    if (ossifer->priv->callbacks.navigation_policy_decision_requested == NULL) {
+        return FALSE;
+    }
+
+    const gchar * uri = webkit_network_request_get_uri (request);
+    switch ((gint)ossifer->priv->callbacks.navigation_policy_decision_requested (ossifer, uri)) {
+        case 1000 /* Ossifer addition for 'unhandled' */:
+            return FALSE;
+        case (gint)WEBKIT_NAVIGATION_RESPONSE_DOWNLOAD:
+            webkit_web_policy_decision_download (policy_decision);
+            break;
+        case (gint)WEBKIT_NAVIGATION_RESPONSE_IGNORE:
+            webkit_web_policy_decision_ignore (policy_decision);
+            break;
+        case (gint)WEBKIT_NAVIGATION_RESPONSE_ACCEPT:
+        default:
+            webkit_web_policy_decision_use (policy_decision);
+            break;
+    }
+
+    return TRUE;
+}
+
 static void
 ossifer_web_view_download_notify_status (GObject* object, GParamSpec* pspec, gpointer user_data)
 {
@@ -185,12 +241,16 @@ ossifer_web_view_init (OssiferWebView *ossifer)
     g_object_get (ossifer, "settings", &settings, NULL);
     g_object_set (settings,
         "enable-plugins", FALSE,
+        "enable-page-cache", TRUE,
         "enable-default-context-menu", FALSE,
         NULL);
 
     g_signal_connect (ossifer, "mime-type-policy-decision-requested",
         G_CALLBACK (ossifer_web_view_mime_type_policy_decision_requested), NULL);
 
+    g_signal_connect (ossifer, "navigation-policy-decision-requested",
+        G_CALLBACK (ossifer_web_view_navigation_policy_decision_requested), NULL);
+
     g_signal_connect (ossifer, "download-requested",
         G_CALLBACK (ossifer_web_view_download_requested), NULL);
 
@@ -202,6 +262,9 @@ ossifer_web_view_init (OssiferWebView *ossifer)
 
     g_signal_connect (ossifer, "create-web-view",
         G_CALLBACK (ossifer_web_view_create_web_view), NULL);
+
+    g_signal_connect (ossifer, "resource-request-starting",
+        G_CALLBACK (ossifer_web_view_resource_request_starting), NULL);
 }
 
 // ---------------------------------------------------------------------------
@@ -298,4 +361,4 @@ ossifer_web_view_execute_script (OssiferWebView *ossifer, const gchar *script)
 {
     g_return_if_fail (OSSIFER_WEB_VIEW (ossifer));
     return webkit_web_view_execute_script (WEBKIT_WEB_VIEW (ossifer), script);
-}
\ No newline at end of file
+}