gsoc2013-evolution - Google Summer of Code 2013 - GNOME

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* mail-session.c: handles the session information and resource manipulation */
/*
 *  Authors: Miguel de Icaza <miguel@gnu.org>
 *
 *  Copyright 2001 Ximian, Inc. (www.ximian.com)
 *
 *  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 Street #330, Boston, MA 02111-1307, USA.
 *
 */

#include <config.h>
#include <gnome.h>
#include "mail.h"
#include "mail-session.h"
#include "mail-mt.h"

CamelSession *session;

static GHashTable *passwords;
static gboolean interaction_enabled;

static void
request_callback (gchar *string, gpointer data)
{
    char **ans = data;

    if (string)
        *ans = g_strdup(string);
    else
        *ans = NULL;
}

char *
mail_session_request_dialog (const char *prompt, gboolean secret, const char *key,
                 gboolean async)
{
    GtkWidget *dialog;
    char *ans;

    if (!passwords)
        passwords = g_hash_table_new (g_str_hash, g_str_equal);

    ans = g_hash_table_lookup (passwords, key);
    if (ans)
        return g_strdup (ans);

    if (!interaction_enabled)
        return NULL;

    if (!async) {
        dialog = gnome_request_dialog (secret, prompt, NULL, 0,
                           request_callback, &ans, NULL);
        if (!dialog)
            return NULL;
        if (gnome_dialog_run_and_close (GNOME_DIALOG (dialog)) == -1 ||
            ans == NULL)
            return NULL;
    } else {
        if ((ans = mail_get_password ((char *) prompt, secret)) == NULL)
            return NULL;
    }

    g_hash_table_insert (passwords, g_strdup (key), g_strdup (ans));
    return ans;
}

static char *
auth_callback (CamelAuthCallbackMode mode, char *data, gboolean secret,
           CamelService *service, char *item, CamelException *ex)
{
    char *key, *ans, *url;

    url = camel_url_to_string (service->url, FALSE);
    key = g_strdup_printf ("%s:%s", url, item);
    g_free (url);

    if (mode == CAMEL_AUTHENTICATOR_TELL) {
        if (!data) {
            g_hash_table_remove (passwords, key);
            g_free (key);
        } else {
            gpointer old_key, old_data;

            if (g_hash_table_lookup_extended (passwords, key,
                              &old_key,
                              &old_data)) {
                g_hash_table_insert (passwords, old_key, data);
                g_free (old_data);
                g_free (key);
            } else
                g_hash_table_insert (passwords, key, data);
        }

        return NULL;
    }

    ans = mail_session_request_dialog (data, secret, key, TRUE);
    g_free (key);

    if (!ans) {
        camel_exception_set (ex, CAMEL_EXCEPTION_USER_CANCEL,
                     "User canceled operation.");
    }

    return ans;
}

static char *
decode_base64 (char *base64)
{
    char *plain, *pad = "==";
    int len, out, state, save;

    len = strlen (base64);
    plain = g_malloc0 (len);
    state = save = 0;
    out = base64_decode_step (base64, len, plain, &state, &save);
    if (len % 4) {
        base64_decode_step (pad, 4 - len % 4, plain + out,
                    &state, &save);
    }

    return plain;
}

static void
maybe_remember_password (gpointer key, gpointer password, gpointer url)
{
    char *path, *key64, *pass64;
    int len, state, save;

    len = strlen (url);
    if (strncmp (key, url, len) != 0)
        return;

    len = strlen (key);
    key64 = g_malloc0 ((len + 2) * 4 / 3 + 1);
    state = save = 0;
    base64_encode_close (key, len, FALSE, key64, &state, &save);
    path = g_strdup_printf ("/Evolution/Passwords/%s", key64);
    g_free (key64);

    len = strlen (password);
    pass64 = g_malloc0 ((len + 2) * 4 / 3 + 1);
    state = save = 0;
    base64_encode_close (password, len, FALSE, pass64, &state, &save);

    gnome_config_private_set_string (path, pass64);
    g_free (path);
    g_free (pass64);
}

void
mail_session_remember_password (const char *url)
{
    g_hash_table_foreach (passwords, maybe_remember_password, (void *) url);
}

void
mail_session_forget_password (const char *key)
{
    gpointer okey, value;
    
    if (g_hash_table_lookup_extended (passwords, key, &okey, &value)) {
        g_hash_table_remove (passwords, key);
        g_free (okey);
        g_free (value);
    }
}

/* ******************** */

struct _timeout_data {
    CamelTimeoutCallback cb;
    gpointer camel_data;
    gboolean result;
};

struct _timeout_msg {
    struct _mail_msg msg;

    CamelTimeoutCallback cb;
    gpointer camel_data;
};

static void timeout_timeout(struct _mail_msg *mm)
{
    struct _timeout_msg *m = (struct _timeout_msg *)mm;

    /* we ignore the callback result, do we care?? no. */
    m->cb(m->camel_data);
}

static struct _mail_msg_op timeout_op = {
    NULL,
    timeout_timeout,
    NULL,
    NULL,
};

static gboolean 
camel_timeout (gpointer data)
{
    struct _timeout_data *td = data;
    struct _timeout_msg *m;

    m = mail_msg_new(&timeout_op, NULL, sizeof(*m));

    m->cb = td->cb;
    m->camel_data = td->camel_data;

    e_thread_put(mail_thread_queued, (EMsg *)m);

    return TRUE;
}

static guint
register_callback (guint32 interval, CamelTimeoutCallback cb, gpointer camel_data)
{
    struct _timeout_data *td;

    /* We do this because otherwise the timeout can get called
     * more often than the dispatch thread can get rid of it,
     * leading to timeout calls piling up, and we don't have a
     * good way to watch the return values. It's not cool.
     */
    g_return_val_if_fail (interval > 1000, 0);

    td = g_malloc(sizeof(*td));
    td->result = TRUE;
    td->cb = cb;
    td->camel_data = camel_data;

    return gtk_timeout_add_full(interval, camel_timeout, NULL, td, g_free);
}

static gboolean
remove_callback (guint handle)
{
    gtk_timeout_remove (handle);
    return TRUE;
}

/* ******************** */

void
mail_session_init (void)
{
    char *camel_dir, *key, *value;
    void *iter;

    camel_init ();
    camel_dir = g_strdup_printf ("%s/mail", evolution_dir);
    session = camel_session_new (camel_dir, auth_callback,
                     register_callback, remove_callback);
    g_free (camel_dir);

    passwords = g_hash_table_new (g_str_hash, g_str_equal);
    iter = gnome_config_private_init_iterator ("/Evolution/Passwords");
    if (iter) {
        while (gnome_config_iterator_next (iter, &key, &value)) {
            g_hash_table_insert (passwords, decode_base64 (key),
                         decode_base64 (value));
            g_free (key);
            g_free (value);
        }
    }
}

void
mail_session_enable_interaction (gboolean enable)
{
    interaction_enabled = enable;
}

static gboolean
free_entry (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
    memset (value, 0, strlen (value));
    g_free (value);
    return TRUE;
}

void
mail_session_forget_passwords (BonoboUIComponent *uih, void *user_data,
                   const char *path)
{
    g_hash_table_foreach_remove (passwords, free_entry, NULL);
    gnome_config_private_clean_section ("/Evolution/Passwords");
    gnome_config_sync ();
}

void
mail_session_set_password (const char *url, const char *password)
{
    g_hash_table_insert (passwords, g_strdup (url), g_strdup (password));
}


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