path: root/camel/providers/nntp/camel-nntp-store.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-nntp-store.c : class for an nntp store */

/* 
 *
 * Copyright (C) 2000 Helix Code, Inc. <toshok@helixcode.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 Place, Suite 330, Boston, MA 02111-1307
 * USA
 */


#include <config.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <dirent.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "libgnome/libgnome.h"

#include "camel-folder-summary.h"
#include "camel-nntp-store.h"
#include "camel-nntp-folder.h"
#include "camel-stream-buffer.h"
#include "camel-stream-fs.h"
#include "camel-exception.h"
#include "camel-url.h"
#include "string-utils.h"

#define NNTP_PORT 119

static CamelServiceClass *service_class = NULL;

/* Returns the class for a CamelNNTPStore */
#define CNNTPS_CLASS(so) CAMEL_NNTP_STORE_CLASS (GTK_OBJECT(so)->klass)
#define CF_CLASS(so) CAMEL_FOLDER_CLASS (GTK_OBJECT(so)->klass)
#define CNNTPF_CLASS(so) CAMEL_NNTP_FOLDER_CLASS (GTK_OBJECT(so)->klass)

static gboolean ensure_news_dir_exists (CamelNNTPStore *store);

static gboolean
nntp_store_connect (CamelService *service, CamelException *ex)
{
    struct hostent *h;
    struct sockaddr_in sin;
    int fd;
    char *buf;
    CamelNNTPStore *store = CAMEL_NNTP_STORE (service);

    if (!ensure_news_dir_exists(store)) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      "Could not open directory for news server: %s",
                      strerror (errno));
        return FALSE;
    }

    if (!service_class->connect (service, ex))
        return FALSE;

    h = camel_service_gethost (service, ex);
    if (!h)
        return FALSE;

    sin.sin_family = h->h_addrtype;
    sin.sin_port = htons (service->url->port ? service->url->port : NNTP_PORT);
    memcpy (&sin.sin_addr, h->h_addr, sizeof (sin.sin_addr));

    fd = socket (h->h_addrtype, SOCK_STREAM, 0);
    if (fd == -1 ||
        connect (fd, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                      "Could not connect to %s (port %s): %s",
                      service->url->host, service->url->port,
                      strerror(errno));
        if (fd > -1)
            close (fd);
        return FALSE;
    }

    store->ostream = camel_stream_fs_new_with_fd (fd);
    store->istream = camel_stream_buffer_new (store->ostream,
                          CAMEL_STREAM_BUFFER_READ);

    /* Read the greeting */
    buf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (store->istream));
    if (!buf) {
        return -1;
    }

    g_free (buf);

    /* get a list of extensions that the server supports */
    if (CAMEL_NNTP_OK == camel_nntp_command (store, NULL, "LIST EXTENSIONS")) {
        char *ext_response = camel_nntp_command_get_additional_data(store);

        g_free (ext_response);
    }

    return TRUE;
}

static gboolean
nntp_store_disconnect (CamelService *service, CamelException *ex)
{
    CamelNNTPStore *store = CAMEL_NNTP_STORE (service);

    if (!service->connected)
        return TRUE;

    camel_nntp_command (store, NULL, "QUIT");

    if (store->newsrc)
        camel_nntp_newsrc_write (store->newsrc);

    if (!service_class->disconnect (service, ex))
        return FALSE;

    gtk_object_unref (GTK_OBJECT (store->ostream));
    gtk_object_unref (GTK_OBJECT (store->istream));
    store->ostream = NULL;
    store->istream = NULL;
    return TRUE;
}

static char *
nntp_store_get_name (CamelService *service, gboolean brief)
{
    /* Same info for long and brief... */
    return g_strdup_printf ("USENET news via %s", service->url->host);
}

static CamelFolder *
nntp_store_get_folder (CamelStore *store, const gchar *folder_name,
               gboolean get_folder, CamelException *ex)
{
    CamelNNTPFolder *new_nntp_folder;
    CamelFolder *new_folder;
    CamelNNTPStore *nntp_store = CAMEL_NNTP_STORE (store);

    /* if we haven't already read our .newsrc, read it now */
    if (!nntp_store->newsrc)
        nntp_store->newsrc = 
        camel_nntp_newsrc_read_for_server (CAMEL_SERVICE(store)->url->host);

    /* check if folder has already been created */
    /* call the standard routine for that when  */
    /* it is done ... */

    new_nntp_folder =  gtk_type_new (CAMEL_NNTP_FOLDER_TYPE);
    new_folder = CAMEL_FOLDER (new_nntp_folder);
    
    /* XXX We shouldn't be passing NULL here, but it's equivalent to
     * what was there before, and there's no
     * CamelNNTPFolder::get_subfolder yet anyway...
     */
    CF_CLASS (new_folder)->init (new_folder, store, NULL,
                     folder_name, ".", FALSE, ex);

    return new_folder;
}

static char *
nntp_store_get_folder_name (CamelStore *store, const char *folder_name,
                CamelException *ex)
{
    return g_strdup (folder_name);
}

static void
finalize (GtkObject *object)
{
    CamelException ex;

    camel_exception_init (&ex);
    nntp_store_disconnect (CAMEL_SERVICE (object), &ex);
    camel_exception_clear (&ex);
}

static void
camel_nntp_store_class_init (CamelNNTPStoreClass *camel_nntp_store_class)
{
    GtkObjectClass *object_class =
        GTK_OBJECT_CLASS (camel_nntp_store_class);
    CamelStoreClass *camel_store_class = CAMEL_STORE_CLASS (camel_nntp_store_class);
    CamelServiceClass *camel_service_class = CAMEL_SERVICE_CLASS (camel_nntp_store_class);

    service_class = gtk_type_class (camel_service_get_type ());
    
    /* virtual method overload */
    object_class->finalize = finalize;

    camel_service_class->connect = nntp_store_connect;
    camel_service_class->disconnect = nntp_store_disconnect;
    camel_service_class->get_name = nntp_store_get_name;

    camel_store_class->get_folder = nntp_store_get_folder;
    camel_store_class->get_folder_name = nntp_store_get_folder_name;
}



static void
camel_nntp_store_init (gpointer object, gpointer klass)
{
    CamelService *service = CAMEL_SERVICE (object);

    service->url_flags = CAMEL_SERVICE_URL_NEED_HOST;
}

GtkType
camel_nntp_store_get_type (void)
{
    static GtkType camel_nntp_store_type = 0;
    
    if (!camel_nntp_store_type) {
        GtkTypeInfo camel_nntp_store_info = 
        {
            "CamelNNTPStore",
            sizeof (CamelNNTPStore),
            sizeof (CamelNNTPStoreClass),
            (GtkClassInitFunc) camel_nntp_store_class_init,
            (GtkObjectInitFunc) camel_nntp_store_init,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };
        
        camel_nntp_store_type = gtk_type_unique (CAMEL_STORE_TYPE, &camel_nntp_store_info);
    }
    
    return camel_nntp_store_type;
}


/**
 * camel_nntp_command: Send a command to a NNTP server.
 * @store: the NNTP store
 * @ret: a pointer to return the full server response in
 * @fmt: a printf-style format string, followed by arguments
 *
 * This command sends the command specified by @fmt and the following
 * arguments to the connected NNTP store specified by @store. It then
 * reads the server's response and parses out the status code. If
 * the caller passed a non-NULL pointer for @ret, camel_nntp_command
 * will set it to point to an buffer containing the rest of the
 * response from the NNTP server. (If @ret was passed but there was
 * no extended response, @ret will be set to NULL.) The caller must
 * free this buffer when it is done with it.
 *
 * Return value: one of CAMEL_NNTP_OK (command executed successfully),
 * CAMEL_NNTP_ERR (command encounted an error), or CAMEL_NNTP_FAIL
 * (a protocol-level error occurred, and Camel is uncertain of the
 * result of the command.)
 **/
int
camel_nntp_command (CamelNNTPStore *store, char **ret, char *fmt, ...)
{
    char *cmdbuf, *respbuf;
    va_list ap;
    int status;
    int resp_code;
    CamelException *ex;

    va_start (ap, fmt);
    cmdbuf = g_strdup_vprintf (fmt, ap);
    va_end (ap);

    ex = camel_exception_new();

    /* make sure we're connected */
    if (store->ostream == NULL)
        nntp_store_connect (CAMEL_SERVICE (store), ex);

    if (camel_exception_get_id (ex)) {
        camel_exception_free (ex);
        return CAMEL_NNTP_FAIL;
    }

    /* Send the command */
    camel_stream_write (store->ostream, cmdbuf, strlen (cmdbuf));
    g_free (cmdbuf);
    camel_stream_write (store->ostream, "\r\n", 2);

    /* Read the response */
    respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (store->istream));
    resp_code = atoi (respbuf);

    if (resp_code < 400)
        status = CAMEL_NNTP_OK;
    else if (resp_code < 500)
        status = CAMEL_NNTP_ERR;
    else
        status = CAMEL_NNTP_FAIL;

    if (ret) {
        *ret = strchr (respbuf, ' ');
        if (*ret)
            *ret = g_strdup (*ret + 1);
    }
    g_free (respbuf);

    return status;
}

/**
 * camel_nntp_command_get_additional_data: get "additional data" from
 * a NNTP command.
 * @store: the NNTP store
 *
 * This command gets the additional data returned by
 * This command gets the additional data returned by "multi-line" POP
 * commands, such as LIST, RETR, TOP, and UIDL. This command _must_
 * be called after a successful (CAMEL_NNTP_OK) call to
 * camel_nntp_command for a command that has a multi-line response.
 * The returned data is un-byte-stuffed, and has lines termined by
 * newlines rather than CR/LF pairs.
 *
 * Return value: the data, which the caller must free.
 **/
char *
camel_nntp_command_get_additional_data (CamelNNTPStore *store)
{
    CamelStreamBuffer *stream = CAMEL_STREAM_BUFFER (store->istream);
    GPtrArray *data;
    char *buf;
    int i, status = CAMEL_NNTP_OK;

    data = g_ptr_array_new ();
    while (1) {
        buf = camel_stream_buffer_read_line (stream);
        if (!buf) {
            status = CAMEL_NNTP_FAIL;
            break;
        }

        if (!strcmp (buf, "."))
            break;
        if (*buf == '.')
            memmove (buf, buf + 1, strlen (buf));
        g_ptr_array_add (data, buf);
    }

    if (status == CAMEL_NNTP_OK) {
        /* Append an empty string to the end of the array
         * so when we g_strjoinv it, we get a "\n" after
         * the last real line.
         */
        g_ptr_array_add (data, "");
        g_ptr_array_add (data, NULL);
        buf = g_strjoinv ("\n", (char **)data->pdata);
    } else
        buf = NULL;

    for (i = 0; i < data->len - 2; i++)
        g_free (data->pdata[i]);
    g_ptr_array_free (data, TRUE);

    return buf;
}

void
camel_nntp_store_subscribe_group (CamelStore *store,
                  const gchar *group_name)
{
    gchar *root_dir = camel_nntp_store_get_toplevel_dir(CAMEL_NNTP_STORE(store));
    char *ret = NULL;
    CamelException *ex = camel_exception_new();

    if (camel_exception_get_id (ex)) {
        g_free (root_dir);
        camel_exception_free (ex);
        return;
    }

    if (CAMEL_NNTP_OK  == camel_nntp_command ( CAMEL_NNTP_STORE (store),
                           &ret, "GROUP %s", group_name)) {
        /* we create an empty summary file here, so that when
                   the group is opened we'll know we need to build it. */
        gchar *summary_file;
        int fd;
        summary_file = g_strdup_printf ("%s/%s-ev-summary", root_dir, group_name);
        
        fd = open (summary_file, O_CREAT | O_RDWR, 0666);
        close (fd);

        g_free (summary_file);
    }
    if (ret) g_free (ret);

    g_free (root_dir);
    camel_exception_free (ex);
}

void
camel_nntp_store_unsubscribe_group (CamelStore *store,
                    const gchar *group_name)
{
    gchar *root_dir = camel_nntp_store_get_toplevel_dir(CAMEL_NNTP_STORE(store));
    gchar *summary_file;

    summary_file = g_strdup_printf ("%s/%s-ev-summary", root_dir, group_name);
    if (g_file_exists (summary_file))
        unlink (summary_file);
    g_free (summary_file);

    g_free (root_dir);
}

GList *
camel_nntp_store_list_subscribed_groups(CamelStore *store)
{
    GList *group_name_list = NULL;
    struct stat stat_buf;
    gint stat_error = 0;
    gchar *entry_name;
    gchar *full_entry_name;
    gchar *real_group_name;
    struct dirent *dir_entry;
    DIR *dir_handle;
    gchar *root_dir = camel_nntp_store_get_toplevel_dir(CAMEL_NNTP_STORE(store));

    dir_handle = opendir (root_dir);
    g_return_val_if_fail (dir_handle, NULL);

    /* read the first entry in the directory */
    dir_entry = readdir (dir_handle);
    while ((stat_error != -1) && (dir_entry != NULL)) {

        /* get the name of the next entry in the dir */
        entry_name = dir_entry->d_name;
        full_entry_name = g_strdup_printf ("%s/%s", root_dir, entry_name);
        stat_error = stat (full_entry_name, &stat_buf);
        g_free (full_entry_name);

        /* is it a normal file ending in -ev-summary ? */
        if ((stat_error != -1) && S_ISREG (stat_buf.st_mode)) {
            gboolean summary_suffix_found;

            real_group_name = string_prefix (entry_name, "-ev-summary",
                             &summary_suffix_found);

            if (summary_suffix_found)
                /* add the folder name to the list */
                group_name_list = g_list_append (group_name_list, 
                                 real_group_name);
        }
        /* read next entry */
        dir_entry = readdir (dir_handle);
    }

    closedir (dir_handle);

    return group_name_list;
}

gchar *
camel_nntp_store_get_toplevel_dir (CamelNNTPStore *store)
{
    CamelURL *url = CAMEL_SERVICE (store)->url;
    char *top_dir;
    extern char *evolution_dir;

    g_assert(url != NULL);

    top_dir = g_strdup_printf( "%s/news/%s",
                   evolution_dir,
                   url->host );

    return top_dir;
}

static gboolean
ensure_news_dir_exists (CamelNNTPStore *store)
{
    gchar *dir = camel_nntp_store_get_toplevel_dir (store);
    struct stat sb;
    int rv;

    rv = stat (dir, &sb);
    if (-1 == rv && errno != ENOENT) {
        g_free (dir);
        return FALSE;
    }

    if (S_ISDIR (sb.st_mode)) {
        g_free (dir);
        return TRUE;
    }
    else {
        rv = mkdir (dir, 0777);
        g_free (dir);

        if (-1 == rv)
            return FALSE;
        else
            return TRUE;
    }
}