path: root/embed/ephy-favicon-cache.c

/*
 *  Copyright (C) 2002 Jorn Baayen <jorn@nl.linux.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <libxml/tree.h>
#include <libgnomevfs/gnome-vfs-ops.h>
#include <string.h>
#include <time.h>
#include <sys/stat.h>

#include "ephy-embed-persist.h"
#include "ephy-file-helpers.h"
#include "ephy-favicon-cache.h"
#include "ephy-node-common.h"
#include "ephy-node.h"
#include "ephy-debug.h"

#define EPHY_FAVICON_CACHE_XML_VERSION "0.1"

#define EPHY_FAVICON_CACHE_OBSOLETE_DAYS 30

static void ephy_favicon_cache_class_init (EphyFaviconCacheClass *klass);
static void ephy_favicon_cache_init (EphyFaviconCache *ma);
static void ephy_favicon_cache_finalize (GObject *object);

struct EphyFaviconCachePrivate
{
    char *directory;
    char *xml_file;
    EphyNodeDb *db;
    EphyNode *icons;
    GHashTable *icons_hash;
    GStaticRWLock *icons_hash_lock;
    GHashTable *downloads_hash;
};

enum
{
    CHANGED,
    LAST_SIGNAL
};

static guint ephy_favicon_cache_signals[LAST_SIGNAL] = { 0 };

static GObjectClass *parent_class = NULL;

GType
ephy_favicon_cache_get_type (void)
{
    static GType ephy_favicon_cache_type = 0;

    if (ephy_favicon_cache_type == 0)
    {
        static const GTypeInfo our_info =
        {
            sizeof (EphyFaviconCacheClass),
            NULL,
            NULL,
            (GClassInitFunc) ephy_favicon_cache_class_init,
            NULL,
            NULL,
            sizeof (EphyFaviconCache),
            0,
            (GInstanceInitFunc) ephy_favicon_cache_init
        };

        ephy_favicon_cache_type = g_type_register_static (G_TYPE_OBJECT,
                                    "EphyFaviconCache",
                                     &our_info, 0);
    }

    return ephy_favicon_cache_type;
}

static void
ephy_favicon_cache_class_init (EphyFaviconCacheClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class = g_type_class_peek_parent (klass);

    object_class->finalize = ephy_favicon_cache_finalize;

    ephy_favicon_cache_signals[CHANGED] =
        g_signal_new ("changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyFaviconCacheClass, changed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__STRING,
                  G_TYPE_NONE,
                  1,
                  G_TYPE_STRING);
}

EphyFaviconCache *
ephy_favicon_cache_new (void)
{
    EphyFaviconCache *cache;

    cache = EPHY_FAVICON_CACHE (g_object_new (EPHY_TYPE_FAVICON_CACHE, NULL));

    g_return_val_if_fail (cache->priv != NULL, NULL);

    return cache;
}

static void
ephy_favicon_cache_load (EphyFaviconCache *eb)
{
    xmlDocPtr doc;
    xmlNodePtr root, child;
    char *tmp;

    if (g_file_test (eb->priv->xml_file, G_FILE_TEST_EXISTS) == FALSE)
        return;

    doc = xmlParseFile (eb->priv->xml_file);
    g_assert (doc != NULL);

    root = xmlDocGetRootElement (doc);

    tmp = xmlGetProp (root, "version");
    g_assert (tmp != NULL && strcmp (tmp, EPHY_FAVICON_CACHE_XML_VERSION) == 0);
    g_free (tmp);

    for (child = root->children; child != NULL; child = child->next)
    {
        EphyNode *node;

        node = ephy_node_new_from_xml (eb->priv->db, child);
    }

    xmlFreeDoc (doc);
}

static gboolean
icon_is_obsolete (EphyNode *node, GDate *now)
{
    int last_visit;
    GDate date;

    last_visit = ephy_node_get_property_int
        (node, EPHY_NODE_FAVICON_PROP_LAST_USED);

        g_date_clear (&date, 1);
        g_date_set_time (&date, last_visit);

    return (g_date_days_between (&date, now) >=
        EPHY_FAVICON_CACHE_OBSOLETE_DAYS);
}

static void
icons_added_cb (EphyNode *node,
            EphyNode *child,
            EphyFaviconCache *eb)
{
    g_static_rw_lock_writer_lock (eb->priv->icons_hash_lock);

    g_hash_table_insert (eb->priv->icons_hash,
                 (char *) ephy_node_get_property_string (child, EPHY_NODE_FAVICON_PROP_URL),
                 child);

    g_static_rw_lock_writer_unlock (eb->priv->icons_hash_lock);
}

static void
icons_removed_cb (EphyNode *node,
          EphyNode *child,
          EphyFaviconCache *eb)
{
    g_static_rw_lock_writer_lock (eb->priv->icons_hash_lock);

    g_hash_table_remove (eb->priv->icons_hash,
                 ephy_node_get_property_string (child, EPHY_NODE_FAVICON_PROP_URL));

    g_static_rw_lock_writer_unlock (eb->priv->icons_hash_lock);
}

static void
remove_obsolete_icons (EphyFaviconCache *eb)
{
    GPtrArray *children;
    int i;
    GTime now;
    GDate current_date;

    now = time (NULL);
        g_date_clear (&current_date, 1);
        g_date_set_time (&current_date, time (NULL));

    children = ephy_node_get_children (eb->priv->icons);
    ephy_node_thaw (eb->priv->icons);
    for (i = 0; i < children->len; i++)
    {
        EphyNode *kid;

        kid = g_ptr_array_index (children, i);

        if (icon_is_obsolete (kid, &current_date))
        {
            const char *filename;
            const char *path;

            filename = ephy_node_get_property_string
                (kid, EPHY_NODE_FAVICON_PROP_FILENAME);
            path = g_build_filename (eb->priv->directory,
                         filename, NULL);
            gnome_vfs_unlink (path);
            ephy_node_unref (kid);
        }
    }
}

static void
ephy_favicon_cache_save (EphyFaviconCache *eb)
{
    xmlDocPtr doc;
    xmlNodePtr root;
    GPtrArray *children;
    int i;

    /* save nodes to xml */
    xmlIndentTreeOutput = TRUE;
    doc = xmlNewDoc ("1.0");

    root = xmlNewDocNode (doc, NULL, "ephy_favicons_cache", NULL);
    xmlSetProp (root, "version", EPHY_FAVICON_CACHE_XML_VERSION);
    xmlDocSetRootElement (doc, root);

    children = ephy_node_get_children (eb->priv->icons);
    for (i = 0; i < children->len; i++)
    {
        EphyNode *kid;

        kid = g_ptr_array_index (children, i);

        ephy_node_save_to_xml (kid, root);
    }
    ephy_node_thaw (eb->priv->icons);

    ephy_file_save_xml (eb->priv->xml_file, doc);

    xmlFreeDoc (doc);
}

static void
ephy_favicon_cache_init (EphyFaviconCache *cache)
{
    EphyNodeDb *db;

    cache->priv = g_new0 (EphyFaviconCachePrivate, 1);

    db = ephy_node_db_new ("EphyFaviconCache");
    cache->priv->db = db;

    cache->priv->xml_file = g_build_filename (ephy_dot_dir (),
                              "ephy-favicon-cache.xml",
                              NULL);

    cache->priv->directory = g_build_filename (ephy_dot_dir (),
                           "favicon_cache/",
                           NULL);

    if (g_file_test (cache->priv->directory, G_FILE_TEST_IS_DIR) == FALSE)
    {
        if (mkdir (cache->priv->directory, 488) != 0)
        {
            g_error ("Couldn't mkdir %s.", cache->priv->directory);
        }
    }

    cache->priv->icons_hash = g_hash_table_new (g_str_hash,
                                        g_str_equal);
    cache->priv->icons_hash_lock = g_new0 (GStaticRWLock, 1);
    g_static_rw_lock_init (cache->priv->icons_hash_lock);
    cache->priv->downloads_hash = g_hash_table_new_full (g_str_hash,
                                                 g_str_equal,
                                 g_free,
                                 NULL);

    /* Icons */
    cache->priv->icons = ephy_node_new_with_id (db, ICONS_NODE_ID);
    ephy_node_ref (cache->priv->icons);
    ephy_node_signal_connect_object (cache->priv->icons,
                         EPHY_NODE_CHILD_ADDED,
                         (EphyNodeCallback) icons_added_cb,
                         G_OBJECT (cache));
    ephy_node_signal_connect_object (cache->priv->icons,
                         EPHY_NODE_CHILD_REMOVED,
                         (EphyNodeCallback) icons_removed_cb,
                         G_OBJECT (cache));

    ephy_favicon_cache_load (cache);
}

static gboolean
kill_download (gpointer key,
           gpointer value,
           gpointer data)
{
    EphyEmbedPersist *persist = EPHY_EMBED_PERSIST (value);
    EphyFaviconCache *cache = EPHY_FAVICON_CACHE (data);
    EphyNode *icon;

    ephy_embed_persist_cancel (persist);
    g_object_unref (persist);

    g_static_rw_lock_reader_lock (cache->priv->icons_hash_lock);
    icon = g_hash_table_lookup (cache->priv->icons_hash, (char *)key);
    g_static_rw_lock_reader_unlock (cache->priv->icons_hash_lock);

    ephy_node_unref (icon);

    return TRUE;
}


static void
cleanup_downloads_hash (EphyFaviconCache *cache)
{
    g_hash_table_foreach_remove (cache->priv->downloads_hash,
                     kill_download, cache);
}

static void
ephy_favicon_cache_finalize (GObject *object)
{
    EphyFaviconCache *cache;

    LOG ("Finalize favicon cache")

    g_return_if_fail (object != NULL);
    g_return_if_fail (EPHY_IS_FAVICON_CACHE (object));

    cache = EPHY_FAVICON_CACHE (object);

    g_return_if_fail (cache->priv != NULL);

    cleanup_downloads_hash (cache);
    remove_obsolete_icons (cache);
    ephy_favicon_cache_save (cache);

    g_free (cache->priv->xml_file);
    g_free (cache->priv->directory);
    g_hash_table_destroy (cache->priv->icons_hash);
    g_static_rw_lock_free (cache->priv->icons_hash_lock);
    g_hash_table_destroy (cache->priv->downloads_hash);

    g_object_unref (cache->priv->db);

    g_free (cache->priv);

    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static char *
favicon_name_build (const char *url)
{
    char *res;
    char *slashpos;

    res = g_strdup (url);

    while ((slashpos = strstr (res, "/")) != NULL)
        *slashpos = '_';

    return res;
}

static void
favicon_download_completed_cb (EphyEmbedPersist *persist,
                   EphyFaviconCache *cache)
{
    char *url;

    url = g_object_get_data (G_OBJECT (persist), "url");
    g_return_if_fail (url != NULL);

    g_signal_emit (G_OBJECT (cache), ephy_favicon_cache_signals[CHANGED], 0, url);

    g_hash_table_remove (cache->priv->downloads_hash, url);
    g_object_unref (persist);
}

static void
ephy_favicon_cache_download (EphyFaviconCache *cache,
                 const char *favicon_url,
                 const char *filename)
{
    EphyEmbedPersist *persist;
    char *dest;

    LOG ("Download favicon: %s", favicon_url)

    g_return_if_fail (EPHY_IS_FAVICON_CACHE (cache));
    g_return_if_fail (favicon_url != NULL);
    g_return_if_fail (filename != NULL);

    dest = g_build_filename (cache->priv->directory, filename, NULL);

    persist = ephy_embed_persist_new (NULL);

    ephy_embed_persist_set_max_size (persist, 100);
    ephy_embed_persist_set_flags    (persist, EMBED_PERSIST_BYPASSCACHE);
    ephy_embed_persist_set_source   (persist, favicon_url);
    ephy_embed_persist_set_dest     (persist, dest);

    g_free (dest);

    g_object_set_data_full (G_OBJECT (persist), "url",
                g_strdup (favicon_url), g_free);

    g_signal_connect (G_OBJECT (persist),
              "completed",
              G_CALLBACK (favicon_download_completed_cb),
              cache);

    g_hash_table_insert (cache->priv->downloads_hash,
                 g_strdup (favicon_url), persist);

    ephy_embed_persist_save (persist);
}

GdkPixbuf *
ephy_favicon_cache_get (EphyFaviconCache *cache,
            const char *url)
{
    GTime now;
    EphyNode *icon;
    GValue value = { 0, };
    char *pix_file;
    GdkPixbuf *pixbuf;

    if (url == NULL) return NULL;

    now = time (NULL);

    g_static_rw_lock_reader_lock (cache->priv->icons_hash_lock);
    icon = g_hash_table_lookup (cache->priv->icons_hash, url);
    g_static_rw_lock_reader_unlock (cache->priv->icons_hash_lock);

    if (!icon)
    {
        char *filename;

        filename = favicon_name_build (url);

        icon = ephy_node_new (cache->priv->db);
        g_value_init (&value, G_TYPE_STRING);
        g_value_set_string (&value, url);
        ephy_node_set_property (icon, EPHY_NODE_FAVICON_PROP_URL,
                        &value);
        g_value_unset (&value);

        g_value_init (&value, G_TYPE_STRING);
        g_value_set_string (&value, filename);
        ephy_node_set_property (icon, EPHY_NODE_FAVICON_PROP_FILENAME,
                        &value);
        g_value_unset (&value);

        ephy_node_add_child (cache->priv->icons, icon);

        ephy_favicon_cache_download (cache, url, filename);

        g_free (filename);
    }

    g_value_init (&value, G_TYPE_INT);
    g_value_set_int (&value, now);
    ephy_node_set_property (icon, EPHY_NODE_FAVICON_PROP_LAST_USED,
                    &value);
    g_value_unset (&value);

    if (g_hash_table_lookup (cache->priv->downloads_hash, url) != NULL)
    {
        /* still downloading, return NULL */
        return NULL;
    }

    pix_file = g_build_filename
        (cache->priv->directory,
         ephy_node_get_property_string (icon, EPHY_NODE_FAVICON_PROP_FILENAME),
         NULL);

    LOG ("Create pixbuf for %s", pix_file)

    pixbuf = gdk_pixbuf_new_from_file (pix_file, NULL);

    if (pixbuf &&
        (gdk_pixbuf_get_width (pixbuf) > 16 ||
         gdk_pixbuf_get_height (pixbuf) > 16))
    {
        GdkPixbuf *scaled = gdk_pixbuf_scale_simple (pixbuf, 16, 16,
                                 GDK_INTERP_NEAREST);
        g_object_unref (G_OBJECT (pixbuf));
        pixbuf = scaled;
    }

    g_free (pix_file);

    return pixbuf;
}