/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * Copyright (C) 2003-2006 Imendio AB
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this program; if not, see <https://www.gnu.org/licenses>
 */

/*
 * Description:
 * A little program that let you send jabber messages to another person.
 *
 * Build instructions:
 * gcc -o lm-send-async `pkg-config --cflags --libs loudmouth-1.0` lm-send-async.c
 */

#include <stdlib.h>
#include <string.h>

#include <loudmouth/loudmouth.h>

static GMainLoop *main_loop;
static gboolean   test_success = FALSE;

static gchar      expected_fingerprint[20];

static gchar     *server = NULL;
static gint       port = 5222;
static gchar     *username = NULL;
static gchar     *password = NULL;
static gchar     *resource = "lm-send-async";
static gchar     *recipient = NULL;
static gchar     *fingerprint = NULL;
static gchar     *message = "test asynchronous message";

static GOptionEntry entries[] =
{
    { "server", 's', 0, G_OPTION_ARG_STRING, &server,
      "Server to connect to", NULL },
    { "port", 'P', 0, G_OPTION_ARG_INT, &port,
      "Port to connect to [default=5222]", NULL },
    { "username", 'u', 0, G_OPTION_ARG_STRING, &username,
      "Username to connect with (user@server.org)", NULL },
    { "password", 'p', 0, G_OPTION_ARG_STRING, &password,
      "Password to try", NULL },
    { "resource", 'r', 0, G_OPTION_ARG_STRING, &resource,
      "Resource connect with [default=lm-send-async]", NULL },
    { "recipient", 'R', 0, G_OPTION_ARG_STRING, &recipient,
      "Recipient to send the message to (e.g. user@server.org)", NULL },
    { "fingerprint", 'f', 0, G_OPTION_ARG_STRING, &fingerprint,
      "SSL Fingerprint to use", NULL },
    { "message", 'm', 0, G_OPTION_ARG_STRING, &message,
      "Message to send to recipient [default=test message]", NULL },
    { NULL }
};

static gchar *
get_part_name (const gchar *username)
{
    const gchar *ch;

    g_return_val_if_fail (username != NULL, NULL);

    ch = strchr (username, '@');
    if (!ch) {
        return NULL;
    }

    return g_strndup (username, ch - username);
}

static void
print_finger (const char   *fpr,
              unsigned int  size)
{
    gint i;
    for (i = 0; i < size-1; i++) {
        g_printerr ("%02X:", fpr[i]);
    }

    g_printerr ("%02X", fpr[size-1]);
}

static LmSSLResponse
ssl_cb (LmSSL       *ssl,
        LmSSLStatus  status,
        gpointer     ud)
{
    g_print ("LmSendAsync: SSL status:%d\n", status);

    switch (status) {
    case LM_SSL_STATUS_NO_CERT_FOUND:
        g_printerr ("LmSendAsync: No certificate found!\n");
        break;
    case LM_SSL_STATUS_UNTRUSTED_CERT:
        g_printerr ("LmSendAsync: Certificate is not trusted!\n");
        break;
    case LM_SSL_STATUS_CERT_EXPIRED:
        g_printerr ("LmSendAsync: Certificate has expired!\n");
        break;
    case LM_SSL_STATUS_CERT_NOT_ACTIVATED:
        g_printerr ("LmSendAsync: Certificate has not been activated!\n");
        break;
    case LM_SSL_STATUS_CERT_HOSTNAME_MISMATCH:
        g_printerr ("LmSendAsync: Certificate hostname does not match expected hostname!\n");
        break;
    case LM_SSL_STATUS_CERT_FINGERPRINT_MISMATCH: {
        const char *fpr = lm_ssl_get_fingerprint (ssl);
        g_printerr ("LmSendAsync: Certificate fingerprint does not match expected fingerprint!\n");
        g_printerr ("LmSendAsync: Remote fingerprint: ");
        print_finger (fpr, 16);

        g_printerr ("\n"
                    "LmSendAsync: Expected fingerprint: ");
        print_finger (expected_fingerprint, 16);
        g_printerr ("\n");
        break;
    }
    case LM_SSL_STATUS_GENERIC_ERROR:
        g_printerr ("LmSendAsync: Generic SSL error!\n");
        break;
    }

    return LM_SSL_RESPONSE_CONTINUE;
}

static void
connection_auth_cb (LmConnection *connection,
                    gboolean      success,
                    gpointer      user_data)
{
    if (success) {
        GError    *error = NULL;
        LmMessage *m;

        g_print ("LmSendAsync: Authenticated successfully\n");

        m = lm_message_new (recipient, LM_MESSAGE_TYPE_MESSAGE);
        lm_message_node_add_child (m->node, "body", message);

        if (!lm_connection_send (connection, m, &error)) {
            g_printerr ("LmSendAsync: Failed to send message:'%s'\n",
                        lm_message_node_to_string (m->node));
        } else {
            g_print ("LmSendAsync: Sent message:'%s'\n",
                     lm_message_node_to_string (m->node));
            test_success = TRUE;
        }

        lm_message_unref (m);
    } else {
        g_printerr ("LmSendAsync: Failed to authenticate\n");
    }

    lm_connection_close (connection, NULL);
    g_main_loop_quit (main_loop);
}

static void
connection_open_cb (LmConnection *connection,
                    gboolean      success,
                    gpointer      user_data)
{
    if (success) {
        gchar *user;

        user = get_part_name (username);
        if (!lm_connection_authenticate (connection, user,
                                         password, resource,
                                         connection_auth_cb,
                                         NULL, FALSE,  NULL)) {
            g_free (user);
            g_printerr ("LmSendAsync: Failed to send authentication\n");
            g_main_loop_quit (main_loop);
            return;
        }

        g_free (user);

        g_print ("LmSendAsync: Sent authentication message\n");
    } else {
        g_printerr ("LmSendAsync: Failed to connect\n");
        g_main_loop_quit (main_loop);
    }
}

int
main (int argc, char **argv)
{
    GMainContext   *main_context;
    GOptionContext *context;
    LmConnection   *connection;

    context = g_option_context_new ("- test send message asynchronously");
    g_option_context_add_main_entries (context, entries, NULL);
    g_option_context_parse (context, &argc, &argv, NULL);
    g_option_context_free (context);

    if (!username || !password || !recipient) {
        g_printerr ("For usage, try %s --help\n", argv[0]);
        return EXIT_FAILURE;
    }

    if (username && strchr (username, '@') == NULL) {
        g_printerr ("LmSendAsync: Username must have an '@' included\n");
        return EXIT_FAILURE;
    }

    main_context = g_main_context_new ();
    connection = lm_connection_new_with_context (server, main_context);
    lm_connection_set_port (connection, port);
    lm_connection_set_jid (connection, username);

    if (fingerprint) {
        LmSSL *ssl;
        char  *p;
        int    i;

        if (port == LM_CONNECTION_DEFAULT_PORT) {
            lm_connection_set_port (connection,
                                    LM_CONNECTION_DEFAULT_PORT_SSL);
        }

        for (i = 0, p = fingerprint; *p && *(p+1); i++, p += 3) {
            expected_fingerprint[i] = (unsigned char) g_ascii_strtoull (p, NULL, 16);
        }

        ssl = lm_ssl_new (expected_fingerprint,
                          (LmSSLFunction) ssl_cb,
                          NULL, NULL);

        lm_ssl_use_starttls (ssl, TRUE, FALSE);

        lm_connection_set_ssl (connection, ssl);
        lm_ssl_unref (ssl);
    }

    if (!lm_connection_open (connection,
                             (LmResultFunction) connection_open_cb,
                             NULL, NULL, NULL)) {
        g_printerr ("LmSendAsync: Could not open a connection\n");
        return EXIT_FAILURE;
    }

    main_loop = g_main_loop_new (main_context, FALSE);
    g_main_loop_run (main_loop);

    return (test_success ? EXIT_SUCCESS : EXIT_FAILURE);
}