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authorPeter Hofmann <scm@uninformativ.de>2018-07-07 13:24:02 +0200
committerPeter Hofmann <scm@uninformativ.de>2018-07-10 19:00:01 +0200
commitae12ce8df22a0388bdf24b2164882f5fb95255c5 (patch)
tree968a4536dcf4facaa7d88ddc69cd81fd2c2c2abf /browser.c
parent0645abbf01a156fed0f1b95fc9b9c98b8d0e530e (diff)
downloadlariza-ae12ce8df22a0388bdf24b2164882f5fb95255c5.tar.gz
Indicate RSS/Atom feeds on web sites
Diffstat (limited to 'browser.c')
-rw-r--r--browser.c157
1 files changed, 156 insertions, 1 deletions
diff --git a/browser.c b/browser.c
index 68d190b..c2eb9ab 100644
--- a/browser.c
+++ b/browser.c
@@ -11,6 +11,7 @@
#include <gdk/gdkkeysyms.h>
#include <gio/gio.h>
#include <webkit2/webkit2.h>
+#include <JavaScriptCore/JavaScript.h>
static void client_destroy(GtkWidget *, gpointer);
@@ -33,8 +34,11 @@ static gboolean downloadmanager_delete(GtkWidget *, gpointer);
static void downloadmanager_setup(void);
static gchar *ensure_uri_scheme(const gchar *);
static void external_handler_run(GSimpleAction *, GVariant *, gpointer);
+static void feed_icon(gpointer, gchar *);
static void grab_environment_configuration(void);
+static void grab_feeds_finished(GObject *, GAsyncResult *, gpointer);
static void hover_web_view(WebKitWebView *, WebKitHitTestResult *, guint, gpointer);
+static void icon_location(GtkEntry *, GtkEntryIconPosition, GdkEvent *, gpointer);
static gboolean key_common(GtkWidget *, GdkEvent *, gpointer);
static gboolean key_downloadmanager(GtkWidget *, GdkEvent *, gpointer);
static gboolean key_location(GtkWidget *, GdkEvent *, gpointer);
@@ -55,6 +59,7 @@ struct Client
{
gchar *external_handler_uri;
gchar *hover_uri;
+ gchar *feed_html;
GtkWidget *location;
GtkWidget *vbox;
GtkWidget *web_view;
@@ -88,6 +93,46 @@ static gchar *search_text = NULL;
static gboolean tabbed_automagic = TRUE;
static gchar *user_agent = NULL;
+static gchar *feed_html_header =
+"<!DOCTYPE html>"
+"<html>"
+" <head>"
+" <title>Feeds</title>"
+" </head>"
+" <body>"
+" <p>Feeds found on this page:</p>"
+" <ul>"
+;
+
+static gchar *feed_html_footer =
+" </ul>"
+" </body>"
+"</html>"
+;
+
+static gchar *grab_feeds =
+"a = document.querySelectorAll('"
+" html > head > link[rel=\"alternate\"][href][type=\"application/atom+xml\"],"
+" html > head > link[rel=\"alternate\"][href][type=\"application/rss+xml\"]"
+"');"
+"if (a.length == 0)"
+" null;"
+"else"
+"{"
+" out = '';"
+" for (i = 0; i < a.length; i++)"
+" {"
+" url = encodeURIComponent(a[i].href);"
+" if ('title' in a[i] && a[i].title != '')"
+" title = encodeURIComponent(a[i].title);"
+" else"
+" title = url;"
+" out += '<li><a href=\"' + url + '\">' + title + '</a></li>';"
+" }"
+" out;"
+"}"
+;
+
void
client_destroy(GtkWidget *widget, gpointer data)
@@ -214,6 +259,8 @@ client_new(const gchar *uri, WebKitWebView *related_wv, gboolean show)
c->location = gtk_entry_new();
g_signal_connect(G_OBJECT(c->location), "key-press-event",
G_CALLBACK(key_location), c);
+ g_signal_connect(G_OBJECT(c->location), "icon-release",
+ G_CALLBACK(icon_location), c);
c->vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
gtk_box_pack_start(GTK_BOX(c->vbox), c->location, FALSE, FALSE, 0);
@@ -327,7 +374,17 @@ changed_load_progress(GObject *obj, GParamSpec *pspec, gpointer data)
p = webkit_web_view_get_estimated_load_progress(WEBKIT_WEB_VIEW(c->web_view));
if (p == 1)
+ {
p = 0;
+
+ /* The page has loaded fully. We now run a short JavaScript
+ * snippet that operates on the DOM. It tries to grab all
+ * occurences of <link rel="alternate" ...>, i.e. RSS/Atom feed
+ * references. */
+ webkit_web_view_run_javascript(WEBKIT_WEB_VIEW(c->web_view),
+ grab_feeds, NULL,
+ grab_feeds_finished, c);
+ }
gtk_entry_set_progress_fraction(GTK_ENTRY(c->location), p);
}
@@ -545,7 +602,8 @@ ensure_uri_scheme(const gchar *t)
if (!g_str_has_prefix(f, "http:") &&
!g_str_has_prefix(f, "https:") &&
!g_str_has_prefix(f, "file:") &&
- !g_str_has_prefix(f, "about:"))
+ !g_str_has_prefix(f, "about:") &&
+ !g_str_has_prefix(f, "data:"))
{
g_free(f);
fabs = realpath(t, NULL);
@@ -585,6 +643,31 @@ external_handler_run(GSimpleAction *simple, GVariant *param, gpointer data)
g_spawn_close_pid(pid);
}
+void feed_icon(gpointer user_data, gchar *feed_html)
+{
+ struct Client *c = (struct Client *)user_data;
+
+ if (feed_html != NULL)
+ {
+ gtk_entry_set_icon_from_icon_name(GTK_ENTRY(c->location),
+ GTK_ENTRY_ICON_PRIMARY,
+ "application-rss+xml-symbolic");
+ gtk_entry_set_icon_activatable(GTK_ENTRY(c->location),
+ GTK_ENTRY_ICON_PRIMARY,
+ TRUE);
+
+ if (c->feed_html != NULL)
+ g_free(c->feed_html);
+ c->feed_html = g_strdup(feed_html);
+ }
+ else
+ {
+ gtk_entry_set_icon_from_icon_name(GTK_ENTRY(c->location),
+ GTK_ENTRY_ICON_PRIMARY,
+ NULL);
+ }
+}
+
void
grab_environment_configuration(void)
{
@@ -628,6 +711,48 @@ grab_environment_configuration(void)
}
void
+grab_feeds_finished(GObject *object, GAsyncResult *result, gpointer data)
+{
+ WebKitJavascriptResult *js_result;
+ JSValueRef value;
+ JSGlobalContextRef context;
+ GError *err = NULL;
+ JSStringRef js_str_value;
+ gchar *str_value;
+ gsize str_length;
+
+ /* This was taken almost verbatim from the example in WebKit's
+ * documentation. */
+
+ js_result = webkit_web_view_run_javascript_finish(WEBKIT_WEB_VIEW(object),
+ result, &err);
+ if (!js_result)
+ {
+ fprintf(stderr, __NAME__": Error running javascript: %s\n", err->message);
+ g_error_free(err);
+ return;
+ }
+
+ context = webkit_javascript_result_get_global_context(js_result);
+ value = webkit_javascript_result_get_value(js_result);
+
+ if (JSValueIsString(context, value))
+ {
+ js_str_value = JSValueToStringCopy(context, value, NULL);
+ str_length = JSStringGetMaximumUTF8CStringSize(js_str_value);
+ str_value = (gchar *)g_malloc(str_length);
+ JSStringGetUTF8CString(js_str_value, str_value, str_length);
+ JSStringRelease(js_str_value);
+ feed_icon(data, str_value);
+ g_free(str_value);
+ }
+ else
+ feed_icon(data, NULL);
+
+ webkit_javascript_result_unref(js_result);
+}
+
+void
hover_web_view(WebKitWebView *web_view, WebKitHitTestResult *ht, guint modifiers,
gpointer data)
{
@@ -656,6 +781,36 @@ hover_web_view(WebKitWebView *web_view, WebKitHitTestResult *ht, guint modifiers
}
}
+void
+icon_location(GtkEntry *entry, GtkEntryIconPosition icon_pos, GdkEvent *event, gpointer data)
+{
+ struct Client *c = (struct Client *)data;
+ gchar *d;
+
+ if (c->feed_html != NULL)
+ {
+ /* What we're actually trying to do is show a simple HTML page
+ * that lists all the feeds on the current page. The function
+ * webkit_web_view_load_html() looks like the proper way to do
+ * that. Sad thing is, it doesn't create a history entry, but
+ * instead simply replaces the content of the current page. This
+ * is not what we want.
+ *
+ * RFC 2397 [0] defines the data URI scheme [1]. We abuse this
+ * mechanism to show my custom HTML snippet *and* create a
+ * history entry.
+ *
+ * [0]: https://tools.ietf.org/html/rfc2397
+ * [1]: https://en.wikipedia.org/wiki/Data_URI_scheme */
+ d = g_strdup_printf("data:text/html,%s%s%s",
+ feed_html_header,
+ c->feed_html,
+ feed_html_footer);
+ webkit_web_view_load_uri(WEBKIT_WEB_VIEW(c->web_view), d);
+ g_free(d);
+ }
+}
+
gboolean
key_common(GtkWidget *widget, GdkEvent *event, gpointer data)
{
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-03 16:26:05 +0000