Feeds

From: Peter Hofmann Date: Sat, 7 Jul 2018 11:24:02 +0000 (+0200) Subject: Indicate RSS/Atom feeds on web sites X-Git-Tag: v1.0.0~130 X-Git-Url: https://git.armaanb.net/?p=chorizo.git;a=commitdiff_plain;h=ae12ce8df22a0388bdf24b2164882f5fb95255c5 Indicate RSS/Atom feeds on web sites --- diff --git a/browser.c b/browser.c index 68d190b..c2eb9ab 100644 --- a/browser.c +++ b/browser.c @@ -11,6 +11,7 @@ #include #include #include +#include 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 = +"" +"" +" " +" Feeds" +" " +" " +"

Feeds found on this page:

" +"

" +; + +static gchar *feed_html_footer = +" " +" " +"" +; + +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 += '

' + title + '

';" +" }" +" 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 , 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) { @@ -627,6 +710,48 @@ grab_environment_configuration(void) global_zoom = atof(e); } +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) {