[evolution] Show local images in Signature preview

[Milan Crha <mcrha src gnome org>]

commit 39645fa1b90b319aa024b89f56dd2567a3a54686
Author: Milan Crha <mcrha redhat com>
Date:   Wed Feb 20 19:21:55 2013 +0100

    Show local images in Signature preview
    
    WebKit deny in loading local URIs (file://...) when an HTML body is
    constructed from a string, not from a local file, thus fix the URIs
    into "evo-file://", which are passed into our request handlers,
    which can load the local files.

 e-util/e-mail-signature-preview.c |   64 +++++++++++++++++++++++++++++++++++-
 1 files changed, 62 insertions(+), 2 deletions(-)
---
diff --git a/e-util/e-mail-signature-preview.c b/e-util/e-mail-signature-preview.c
index 8bf27fd..d4b57f4 100644
--- a/e-util/e-mail-signature-preview.c
+++ b/e-util/e-mail-signature-preview.c
@@ -57,6 +57,64 @@ G_DEFINE_TYPE (
        E_TYPE_WEB_VIEW)
 
 static void
+replace_local_image_links (WebKitDOMElement *element)
+{
+       if (!element)
+               return;
+
+       if (WEBKIT_DOM_IS_HTML_IMAGE_ELEMENT (element)) {
+               WebKitDOMHTMLImageElement *img;
+               gchar *src;
+
+               img = WEBKIT_DOM_HTML_IMAGE_ELEMENT (element);
+               src = webkit_dom_html_image_element_get_src (img);
+               if (src && g_ascii_strncasecmp (src, "file://", 7) == 0) {
+                       gchar *new_src;
+
+                       /* this forms "evo-file://", which can be loaded,
+                          while "file://" cannot be, due to webkit policy */
+                       new_src = g_strconcat ("evo-", src, NULL);
+                       webkit_dom_html_image_element_set_src (img, new_src);
+                       g_free (new_src);
+               }
+
+               g_free (src);
+       }
+
+       if (WEBKIT_DOM_IS_HTML_IFRAME_ELEMENT (element)) {
+               WebKitDOMDocument *frame_document;
+
+               frame_document =
+                       webkit_dom_html_iframe_element_get_content_document (
+                               WEBKIT_DOM_HTML_IFRAME_ELEMENT (element));
+               replace_local_image_links (WEBKIT_DOM_ELEMENT (frame_document));
+       }
+
+       replace_local_image_links (webkit_dom_element_get_first_element_child (element));
+
+       while (element = webkit_dom_element_get_next_element_sibling (element), element) {
+               replace_local_image_links (element);
+       }
+}
+
+static void
+signature_preview_document_loaded_cb (WebKitWebView *web_view,
+                                     WebKitWebFrame *web_frame,
+                                     gpointer user_data)
+{
+       WebKitDOMDocument *document;
+       WebKitDOMNode *node;
+
+       document = webkit_web_view_get_dom_document (web_view);
+       for (node = webkit_dom_node_get_first_child (WEBKIT_DOM_NODE (document));
+            node;
+            node = webkit_dom_node_get_next_sibling (node)) {
+               if (WEBKIT_DOM_IS_ELEMENT (node))
+                       replace_local_image_links (WEBKIT_DOM_ELEMENT (node));
+       }
+}
+
+static void
 mail_signature_preview_load_cb (ESource *source,
                                 GAsyncResult *result,
                                 EMailSignaturePreview *preview)
@@ -94,9 +152,9 @@ mail_signature_preview_load_cb (ESource *source,
        extension = e_source_get_extension (source, extension_name);
        mime_type = e_source_mail_signature_get_mime_type (extension);
 
-       if (g_strcmp0 (mime_type, "text/html") == 0)
+       if (g_strcmp0 (mime_type, "text/html") == 0) {
                e_web_view_load_string (E_WEB_VIEW (preview), contents);
-       else {
+       } else {
                gchar *string;
 
                string = g_markup_printf_escaped ("<pre>%s</pre>", contents);
@@ -303,6 +361,8 @@ static void
 e_mail_signature_preview_init (EMailSignaturePreview *preview)
 {
        preview->priv = E_MAIL_SIGNATURE_PREVIEW_GET_PRIVATE (preview);
+
+       g_signal_connect (preview, "document-load-finished", G_CALLBACK 
(signature_preview_document_loaded_cb), NULL);
 }
 
 GtkWidget *