path: root/libempathy/empathy-utils.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2003-2007 Imendio AB
 * Copyright (C) 2007 Collabora Ltd.
 *
 * 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.
 *
 * Authors: Richard Hult <richard@imendio.com>
 *          Martyn Russell <martyn@imendio.com>
 *          Xavier Claessens <xclaesse@gmail.com>
 */

#include "config.h"

#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <regex.h>

#include <glib/gi18n.h>

#include <libxml/uri.h>
#include <libtelepathy/tp-helpers.h>

#include "empathy-debug.h"
#include "empathy-utils.h"
#include "empathy-contact-manager.h"

#define DEBUG_DOMAIN "Utils"

static void regex_init (void);

gchar *
empathy_substring (const gchar *str,
          gint         start,
          gint         end)
{
    return g_strndup (str + start, end - start);
}

/*
 * Regular Expression code to match urls.
 */
#define USERCHARS "-A-Za-z0-9"
#define PASSCHARS "-A-Za-z0-9,?;.:/!%$^*&~\"#'"
#define HOSTCHARS "-A-Za-z0-9"
#define PATHCHARS "-A-Za-z0-9_$.+!*(),;:@&=?/~#%"
#define SCHEME    "(news:|telnet:|nntp:|file:/|https?:|ftps?:|webcal:)"
#define USER      "[" USERCHARS "]+(:["PASSCHARS "]+)?"
#define URLPATH   "/[" PATHCHARS "]*[^]'.}>) \t\r\n,\\\"]"

static regex_t dingus[EMPATHY_REGEX_ALL];

static void
regex_init (void)
{
    static gboolean  inited = FALSE;
    const gchar     *expression;
    gint             i;

    if (inited) {
        return;
    }

    for (i = 0; i < EMPATHY_REGEX_ALL; i++) {
        switch (i) {
        case EMPATHY_REGEX_AS_IS:
            expression =
                SCHEME "//(" USER "@)?[" HOSTCHARS ".]+"
                "(:[0-9]+)?(" URLPATH ")?";
            break;
        case EMPATHY_REGEX_BROWSER:
            expression =
                "(www|ftp)[" HOSTCHARS "]*\\.[" HOSTCHARS ".]+"
                "(:[0-9]+)?(" URLPATH ")?";
            break;
        case EMPATHY_REGEX_EMAIL:
            expression =
                "(mailto:)?[a-z0-9][a-z0-9.-]*@[a-z0-9]"
                "[a-z0-9-]*(\\.[a-z0-9][a-z0-9-]*)+";
            break;
        case EMPATHY_REGEX_OTHER:
            expression =
                "news:[-A-Z\\^_a-z{|}~!\"#$%&'()*+,./0-9;:=?`]+"
                "@[" HOSTCHARS ".]+(:[0-9]+)?";
            break;
        default:
            /* Silence the compiler. */
            expression = NULL;
            continue;
        }

        memset (&dingus[i], 0, sizeof (regex_t));
        regcomp (&dingus[i], expression, REG_EXTENDED | REG_ICASE);
    }

    inited = TRUE;
}

gint
empathy_regex_match (EmpathyRegExType  type,
            const gchar     *msg,
            GArray          *start,
            GArray          *end)
{
    regmatch_t matches[1];
    gint       ret = 0;
    gint       num_matches = 0;
    gint       offset = 0;
    gint       i;

    g_return_val_if_fail (type >= 0 || type <= EMPATHY_REGEX_ALL, 0);

    regex_init ();

    while (!ret && type != EMPATHY_REGEX_ALL) {
        ret = regexec (&dingus[type], msg + offset, 1, matches, 0);
        if (ret == 0) {
            gint s;

            num_matches++;

            s = matches[0].rm_so + offset;
            offset = matches[0].rm_eo + offset;

            g_array_append_val (start, s);
            g_array_append_val (end, offset);
        }
    }

    if (type != EMPATHY_REGEX_ALL) {
        empathy_debug (DEBUG_DOMAIN,
                  "Found %d matches for regex type:%d",
                  num_matches, type);
        return num_matches;
    }

    /* If EMPATHY_REGEX_ALL then we run ALL regex's on the string. */
    for (i = 0; i < EMPATHY_REGEX_ALL; i++, ret = 0) {
        while (!ret) {
            ret = regexec (&dingus[i], msg + offset, 1, matches, 0);
            if (ret == 0) {
                gint s;

                num_matches++;

                s = matches[0].rm_so + offset;
                offset = matches[0].rm_eo + offset;

                g_array_append_val (start, s);
                g_array_append_val (end, offset);
            }
        }
    }

    empathy_debug (DEBUG_DOMAIN,
              "Found %d matches for ALL regex types",
              num_matches);

    return num_matches;
}

gint
empathy_strcasecmp (const gchar *s1,
           const gchar *s2)
{
    return empathy_strncasecmp (s1, s2, -1);
}

gint
empathy_strncasecmp (const gchar *s1,
            const gchar *s2,
            gsize        n)
{
    gchar *u1, *u2;
    gint   ret_val;

    u1 = g_utf8_casefold (s1, n);
    u2 = g_utf8_casefold (s2, n);

    ret_val = g_utf8_collate (u1, u2);
    g_free (u1);
    g_free (u2);

    return ret_val;
}

/* Stolen from telepathy-glib */
gboolean
empathy_strdiff (const gchar *left, const gchar *right)
{
  if ((NULL == left) != (NULL == right))
    return TRUE;

  else if (left == right)
    return FALSE;

  else
    return (0 != strcmp (left, right));
}

/* Stolen from telepathy-glib */
static inline gboolean
_esc_ident_bad (gchar c, gboolean is_first)
{
  return ((c < 'a' || c > 'z') &&
          (c < 'A' || c > 'Z') &&
          (c < '0' || c > '9' || is_first));
}

/* Stolen from telepathy-glib */
gchar *
empathy_escape_as_identifier (const gchar *name)
{
  gboolean bad = FALSE;
  size_t len = 0;
  GString *op;
  const gchar *ptr, *first_ok;

  g_return_val_if_fail (name != NULL, NULL);

  for (ptr = name; *ptr; ptr++)
    {
      if (_esc_ident_bad (*ptr, ptr == name))
        {
          bad = TRUE;
          len += 3;
        }
      else
        len++;
    }

  /* fast path if it's clean */
  if (!bad)
    return g_strdup (name);

  /* If strictly less than ptr, first_ok is the first uncopied safe character.
   */
  first_ok = name;
  op = g_string_sized_new (len);
  for (ptr = name; *ptr; ptr++)
    {
      if (_esc_ident_bad (*ptr, ptr == name))
        {
          /* copy preceding safe characters if any */
          if (first_ok < ptr)
            {
              g_string_append_len (op, first_ok, ptr - first_ok);
            }
          /* escape the unsafe character */
          g_string_append_printf (op, "_%02x", (unsigned char)(*ptr));
          /* restart after it */
          first_ok = ptr + 1;
        }
    }
  /* copy trailing safe characters if any */
  if (first_ok < ptr)
    {
      g_string_append_len (op, first_ok, ptr - first_ok);
    }
  return g_string_free (op, FALSE);
}

gboolean
empathy_xml_validate (xmlDoc      *doc,
             const gchar *dtd_filename)
{
    gchar        *path, *escaped;
    xmlValidCtxt  cvp;
    xmlDtd       *dtd;
    gboolean      ret;

    path = g_build_filename (DATADIR, "empathy", dtd_filename, NULL);

    /* The list of valid chars is taken from libxml. */
    escaped = xmlURIEscapeStr (path, ":@&=+$,/?;");

    g_free (path);

    memset (&cvp, 0, sizeof (cvp));
    dtd = xmlParseDTD (NULL, escaped);
    ret = xmlValidateDtd (&cvp, doc, dtd);

    xmlFree (escaped);
    xmlFreeDtd (dtd);

    return ret;
}

xmlNodePtr
empathy_xml_node_get_child (xmlNodePtr   node, 
               const gchar *child_name)
{
    xmlNodePtr l;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (child_name != NULL, NULL);

    for (l = node->children; l; l = l->next) {
        if (l->name && strcmp (l->name, child_name) == 0) {
            return l;
        }
    }

    return NULL;
}

xmlChar *
empathy_xml_node_get_child_content (xmlNodePtr   node, 
                   const gchar *child_name)
{
    xmlNodePtr l;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (child_name != NULL, NULL);

    l = empathy_xml_node_get_child (node, child_name);
    if (l) {
        return xmlNodeGetContent (l);
    }
        
    return NULL;
}

xmlNodePtr
empathy_xml_node_find_child_prop_value (xmlNodePtr   node, 
                       const gchar *prop_name,
                       const gchar *prop_value)
{
    xmlNodePtr l;
    xmlNodePtr found = NULL;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (prop_name != NULL, NULL);
        g_return_val_if_fail (prop_value != NULL, NULL);

    for (l = node->children; l && !found; l = l->next) {
        xmlChar *prop;

        if (!xmlHasProp (l, prop_name)) {
            continue;
        }

        prop = xmlGetProp (l, prop_name);
        if (prop && strcmp (prop, prop_value) == 0) {
            found = l;
        }
        
        xmlFree (prop);
    }
        
    return found;
}

guint
empathy_account_hash (gconstpointer key)
{
    return g_str_hash (mc_account_get_unique_name (MC_ACCOUNT (key)));
}

gboolean
empathy_account_equal (gconstpointer a,
              gconstpointer b)
{
    const gchar *name_a;
    const gchar *name_b;

    name_a = mc_account_get_unique_name (MC_ACCOUNT (a));
    name_b = mc_account_get_unique_name (MC_ACCOUNT (b));

    return g_str_equal (name_a, name_b);
}

MissionControl *
empathy_mission_control_new (void)
{
    static MissionControl *mc = NULL;

    if (!mc) {
        mc = mission_control_new (tp_get_bus ());
        g_object_add_weak_pointer (G_OBJECT (mc), (gpointer) &mc);
    } else {
        g_object_ref (mc);
    }

    return mc;
}

gchar *
empathy_inspect_channel (McAccount *account,
                 TpChan    *tp_chan)
{
    g_return_val_if_fail (MC_IS_ACCOUNT (account), NULL);
    g_return_val_if_fail (TELEPATHY_IS_CHAN (tp_chan), NULL);

    return empathy_inspect_handle (account,
                       tp_chan->handle,
                       tp_chan->handle_type);
}

gchar *
empathy_inspect_handle (McAccount *account,
            guint      handle,
            guint      handle_type)
{
    MissionControl  *mc;
    TpConn          *tp_conn;
    GArray          *handles;
    gchar          **names;
    gchar           *name;
    GError          *error;

    g_return_val_if_fail (MC_IS_ACCOUNT (account), NULL);
    g_return_val_if_fail (handle != 0, NULL);
    g_return_val_if_fail (handle_type != 0, NULL);

    mc = empathy_mission_control_new ();
    tp_conn = mission_control_get_connection (mc, account, NULL);
    g_object_unref (mc);

    if (!tp_conn) {
        return NULL;
    }

    /* Get the handle's name */
    handles = g_array_new (FALSE, FALSE, sizeof (guint));
    g_array_append_val (handles, handle);
    if (!tp_conn_inspect_handles (DBUS_G_PROXY (tp_conn),
                      handle_type,
                      handles,
                      &names,
                      &error)) {
        empathy_debug (DEBUG_DOMAIN, 
                  "Couldn't get id: %s",
                  error ? error->message : "No error given");

        g_clear_error (&error);
        g_array_free (handles, TRUE);
        g_object_unref (tp_conn);
        
        return NULL;
    }

    name = *names;
    g_free (names);
    g_object_unref (tp_conn);

    return name;
}