path: root/camel/providers/pop3/camel-pop3-folder.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-pop3-folder.c : class for a pop3 folder */

/* 
 * Authors:
 *   Dan Winship <danw@ximian.com>
 *   Michael Zucchi <notzed@ximian.com>
 *
 * Copyright (C) 2002 Ximian, Inc. (www.ximian.com)
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of version 2 of the GNU General Public 
 * License as published by the Free Software Foundation.
 *
 * 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
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>

#include "camel-pop3-folder.h"
#include "camel-pop3-store.h"
#include "camel-exception.h"
#include "camel-stream-mem.h"
#include "camel-stream-filter.h"
#include "camel-mime-message.h"
#include "camel-operation.h"
#include "camel-data-cache.h"

#include <e-util/md5-utils.h>

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

#define d(x)

#define CF_CLASS(o) (CAMEL_FOLDER_CLASS (CAMEL_OBJECT_GET_CLASS(o)))
static CamelFolderClass *parent_class;

static void pop3_finalize (CamelObject *object);
static void pop3_refresh_info (CamelFolder *folder, CamelException *ex);
static void pop3_sync (CamelFolder *folder, gboolean expunge, CamelException *ex);
static gint pop3_get_message_count (CamelFolder *folder);
static GPtrArray *pop3_get_uids (CamelFolder *folder);
static CamelMimeMessage *pop3_get_message (CamelFolder *folder, const char *uid, CamelException *ex);
static void pop3_set_message_flags (CamelFolder *folder, const char *uid, guint32 flags, guint32 set);

static void
camel_pop3_folder_class_init (CamelPOP3FolderClass *camel_pop3_folder_class)
{
    CamelFolderClass *camel_folder_class =
        CAMEL_FOLDER_CLASS (camel_pop3_folder_class);
    
    parent_class = CAMEL_FOLDER_CLASS(camel_type_get_global_classfuncs (camel_folder_get_type ()));
    
    /* virtual method overload */
    camel_folder_class->refresh_info = pop3_refresh_info;
    camel_folder_class->sync = pop3_sync;
    
    camel_folder_class->get_message_count = pop3_get_message_count;
    camel_folder_class->get_uids = pop3_get_uids;
    camel_folder_class->free_uids = camel_folder_free_shallow;
    
    camel_folder_class->get_message = pop3_get_message;
    camel_folder_class->set_message_flags = pop3_set_message_flags;
}

CamelType
camel_pop3_folder_get_type (void)
{
    static CamelType camel_pop3_folder_type = CAMEL_INVALID_TYPE;
    
    if (!camel_pop3_folder_type) {
        camel_pop3_folder_type = camel_type_register (CAMEL_FOLDER_TYPE, "CamelPOP3Folder",
                                  sizeof (CamelPOP3Folder),
                                  sizeof (CamelPOP3FolderClass),
                                  (CamelObjectClassInitFunc) camel_pop3_folder_class_init,
                                  NULL,
                                  NULL,
                                  (CamelObjectFinalizeFunc) pop3_finalize);
    }
    
    return camel_pop3_folder_type;
}

void
pop3_finalize (CamelObject *object)
{
    CamelPOP3Folder *pop3_folder = CAMEL_POP3_FOLDER (object);
    CamelPOP3FolderInfo **fi = (CamelPOP3FolderInfo **)pop3_folder->uids->pdata;
    int i;

    for (i=0;i<pop3_folder->uids->len;i++,fi++) {
        g_free(fi[0]->uid);
        g_free(fi[0]);
    }

    g_ptr_array_free(pop3_folder->uids, TRUE);
}

CamelFolder *
camel_pop3_folder_new (CamelStore *parent, CamelException *ex)
{
    CamelFolder *folder;

    d(printf("opening pop3 INBOX folder\n"));
    
    folder = CAMEL_FOLDER (camel_object_new (CAMEL_POP3_FOLDER_TYPE));
    camel_folder_construct (folder, parent, "inbox", "inbox");
    
    /* mt-ok, since we dont have the folder-lock for new() */
    camel_folder_refresh_info (folder, ex);/* mt-ok */
    if (camel_exception_is_set (ex)) {
        camel_object_unref (CAMEL_OBJECT (folder));
        folder = NULL;
    }
    
    return folder;
}

static CamelPOP3FolderInfo *
id_to_fi(CamelPOP3Folder *folder, guint32 id)
{
    int i;
    CamelPOP3FolderInfo **fi = (CamelPOP3FolderInfo **)folder->uids->pdata;
    int len = folder->uids->len;

    for (i=0;i<len;i++, fi++)
        if (fi[0]->id == id)
            return fi[0];

    return NULL;
}

static CamelPOP3FolderInfo *
uid_to_fi(CamelPOP3Folder *folder, const char *uid)
{
    int i;
    CamelPOP3FolderInfo **fi = (CamelPOP3FolderInfo **)folder->uids->pdata;
    int len = folder->uids->len;

    for (i=0;i<len;i++,fi++)
        if (fi[0]->uid && strcmp(fi[0]->uid, uid) == 0)
            return fi[0];

    return NULL;
}

static int
fi_to_index(CamelPOP3Folder *folder, CamelPOP3FolderInfo *fin)
{
    int i;
    CamelPOP3FolderInfo **fi = (CamelPOP3FolderInfo **)folder->uids->pdata;
    int len = folder->uids->len;

    for (i=0;i<len;i++,fi++)
        if (fi[0] == fin)
            return i;

    return -1;
}

/* create a uid from md5 of 'top' output */
static void
cmd_builduid(CamelPOP3Engine *pe, CamelPOP3Stream *stream, void *data)
{
    CamelPOP3FolderInfo *fi = data;
    MD5Context md5;
    unsigned char *start;
    unsigned int len;
    unsigned char digest[16];
    int ret;

    /* TODO; somehow work out the limit and use that for proper progress reporting
       We need a pointer to the folder perhaps? */
    camel_operation_progress_count(NULL, fi->id);

    md5_init(&md5);
    do {
        ret = camel_pop3_stream_getd(stream, &start, &len);
        if (ret >= 0)
            md5_update(&md5, start, len);
    } while (ret > 0);
    md5_final(&md5, digest);
    fi->uid = base64_encode_simple (digest, 16);

    d(printf("building uid for id '%d' = '%s'\n", fi->id, fi->uid));
}

static void
cmd_list(CamelPOP3Engine *pe, CamelPOP3Stream *stream, void *data)
{
    int ret;
    unsigned int len, id, size;
    unsigned char *line;
    CamelFolder *folder = data;
    CamelPOP3Store *pop3_store = CAMEL_POP3_STORE (folder->parent_store);
    CamelPOP3FolderInfo *fi;

    do {
        ret = camel_pop3_stream_line(stream, &line, &len);
        if (ret>=0) {
            if (sscanf(line, "%u %u", &id, &size) == 2) {
                fi = g_malloc0(sizeof(*fi));
                fi->size = size;
                fi->id = id;
                if ((pop3_store->engine->capa & CAMEL_POP3_CAP_UIDL) == 0)
                    fi->cmd = camel_pop3_engine_command_new(pe, CAMEL_POP3_COMMAND_MULTI, cmd_builduid, fi, "TOP %u 0\r\n", id);
                g_ptr_array_add(((CamelPOP3Folder *)folder)->uids, fi);
            }
        }
    } while (ret>0);
}

static void
cmd_uidl(CamelPOP3Engine *pe, CamelPOP3Stream *stream, void *data)
{
    int ret;
    unsigned int len;
    unsigned char *line;
    char uid[1025];
    unsigned int id, i=0;
    CamelPOP3FolderInfo *fi;
    CamelPOP3Folder *folder = data;
    
    do {
        ret = camel_pop3_stream_line(stream, &line, &len);
        if (ret>=0) {           
            if (strlen(line) > 1024)
                line[1024] = 0;
            if (sscanf(line, "%u %s", &id, uid) == 2) {
                fi = id_to_fi(folder, id);
                if (fi) {
                    /* fixme: dreadfully inefficient */
                    i = fi_to_index(folder, fi);
                    camel_operation_progress(NULL, (i+1) * 100 / folder->uids->len);
                    fi->uid = g_strdup(uid);
                } else {
                    g_warning("ID %u (uid: %s) not in previous LIST output", id, uid);
                }
            }
        }
    } while (ret>0);
}

static void 
pop3_refresh_info (CamelFolder *folder, CamelException *ex)
{
    CamelPOP3Store *pop3_store = CAMEL_POP3_STORE (folder->parent_store);
    CamelPOP3Folder *pop3_folder = (CamelPOP3Folder *) folder;
    CamelPOP3Command *pcl, *pcu = NULL;
    int i;

    camel_operation_start (NULL, _("Retrieving POP summary"));

    pop3_folder->uids = g_ptr_array_new ();

    pcl = camel_pop3_engine_command_new(pop3_store->engine, CAMEL_POP3_COMMAND_MULTI, cmd_list, folder, "LIST\r\n");
    if (pop3_store->engine->capa & CAMEL_POP3_CAP_UIDL) {
        pcu = camel_pop3_engine_command_new(pop3_store->engine, CAMEL_POP3_COMMAND_MULTI, cmd_uidl, folder, "UIDL\r\n");
    }
    while ((i = camel_pop3_engine_iterate(pop3_store->engine, NULL)) > 0)
        ;

    if (i == -1) {
        if (errno == EINTR)
            camel_exception_setv(ex, CAMEL_EXCEPTION_USER_CANCEL, _("User cancelled"));
        else
            camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot get POP summary: %s"), strerror(errno));
    }

    /* TODO: check every id has a uid & commands returned OK too? */

    /* Free any commands we created along the way */
    if (pop3_store->engine->capa & CAMEL_POP3_CAP_UIDL) {
        camel_pop3_engine_command_free(pop3_store->engine, pcu);
    } else {
        for (i=0;i<pop3_folder->uids->len;i++) {
            CamelPOP3FolderInfo *fi = pop3_folder->uids->pdata[i];
            if (fi->cmd) {
                camel_pop3_engine_command_free(pop3_store->engine, fi->cmd);
                fi->cmd = NULL;
            }
        }
    }

    camel_operation_end (NULL);
    return;
}

static void
pop3_sync (CamelFolder *folder, gboolean expunge, CamelException *ex)
{
    CamelPOP3Folder *pop3_folder;
    CamelPOP3Store *pop3_store;
    int i;
    CamelPOP3FolderInfo *fi;

    if (!expunge)
        return;

    pop3_folder = CAMEL_POP3_FOLDER (folder);
    pop3_store = CAMEL_POP3_STORE (folder->parent_store);

    camel_operation_start(NULL, _("Expunging deleted messages"));
    
    for (i = 0; i < pop3_folder->uids->len; i++) {
        fi = pop3_folder->uids->pdata[i];
        /* busy already?  wait for that to finish first */
        if (fi->cmd) {
            while (camel_pop3_engine_iterate(pop3_store->engine, fi->cmd) > 0)
                ;
            camel_pop3_engine_command_free(pop3_store->engine, fi->cmd);
            fi->cmd = NULL;
        }

        if (fi->flags & CAMEL_MESSAGE_DELETED) {
            fi->cmd = camel_pop3_engine_command_new(pop3_store->engine, 0, NULL, NULL, "DELE %u\r\n", fi->id);

            /* also remove from cache */
            if (pop3_store->cache && fi->uid)
                camel_data_cache_remove(pop3_store->cache, "cache", fi->uid, NULL);
        }
    }

    for (i = 0; i < pop3_folder->uids->len; i++) {
        fi = pop3_folder->uids->pdata[i];
        /* wait for delete commands to finish */
        if (fi->cmd) {
            while (camel_pop3_engine_iterate(pop3_store->engine, fi->cmd) > 0)
                ;
            camel_pop3_engine_command_free(pop3_store->engine, fi->cmd);
            fi->cmd = NULL;
        }
        camel_operation_progress(NULL, (i+1) * 100 / pop3_folder->uids->len);
    }

    camel_operation_end(NULL);

    camel_pop3_store_expunge (pop3_store, ex);
}

static void
cmd_tocache(CamelPOP3Engine *pe, CamelPOP3Stream *stream, void *data)
{
    CamelPOP3FolderInfo *fi = data;
    char buffer[2048];
    int w = 0, n;

    /* What if it fails? */

    /* We write an '*' to the start of the stream to say its not complete yet */
    /* This should probably be part of the cache code */
    if ((n = camel_stream_write(fi->stream, "*", 1)) == -1)
        goto done;

    while ((n = camel_stream_read((CamelStream *)stream, buffer, sizeof(buffer))) > 0) {
        n = camel_stream_write(fi->stream, buffer, n);
        if (n == -1)
            break;

        w += n;
        if (w > fi->size)
            w = fi->size;
        camel_operation_progress(NULL, (w * 100) / fi->size);
    }

    /* it all worked, output a '#' to say we're a-ok */
    if (n != -1) {
        camel_stream_reset(fi->stream);
        n = camel_stream_write(fi->stream, "#", 1);
    }
done:
    if (n == -1) {
        fi->err = errno;
        g_warning("POP3 retrieval failed: %s", strerror(errno));
    } else {
        fi->err = 0;
    }
    
    camel_object_unref((CamelObject *)fi->stream);
    fi->stream = NULL;
}

static CamelMimeMessage *
pop3_get_message (CamelFolder *folder, const char *uid, CamelException *ex)
{
    CamelMimeMessage *message = NULL;
    CamelPOP3Store *pop3_store = CAMEL_POP3_STORE (folder->parent_store);
    CamelPOP3Folder *pop3_folder = (CamelPOP3Folder *)folder;
    CamelPOP3Command *pcr;
    CamelPOP3FolderInfo *fi;
    char buffer[1];
    int ok, i;
    CamelStream *stream = NULL;

    fi = uid_to_fi(pop3_folder, uid);
    if (fi == NULL) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_INVALID_UID,
                      _("No message with uid %s"), uid);
        return NULL;
    }

    /* Sigh, most of the crap in this function is so that the cancel button
       returns the proper exception code.  Sigh. */

    camel_operation_start_transient(NULL, _("Retrieving POP message %d"), fi->id);

    /* If we have an oustanding retrieve message running, wait for that to complete
       & then retrieve from cache, otherwise, start a new one, and similar */

    if (fi->cmd != NULL) {
        while ((i = camel_pop3_engine_iterate(pop3_store->engine, fi->cmd)) > 0)
            ;

        if (i == -1)
            fi->err = errno;

        /* getting error code? */
        ok = fi->cmd->state == CAMEL_POP3_COMMAND_DATA;
        camel_pop3_engine_command_free(pop3_store->engine, fi->cmd);
        fi->cmd = NULL;

        if (fi->err != 0) {
            if (fi->err == EINTR)
                camel_exception_setv(ex, CAMEL_EXCEPTION_USER_CANCEL, _("User cancelled"));
            else
                camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot get message %s: %s"), uid, strerror(fi->err));
            goto fail;
        }
    }
    
    /* check to see if we have safely written flag set */
    if (pop3_store->cache == NULL
        || (stream = camel_data_cache_get(pop3_store->cache, "cache", fi->uid, NULL)) == NULL
        || camel_stream_read(stream, buffer, 1) != 1
        || buffer[0] != '#') {

        /* Initiate retrieval, if disk backing fails, use a memory backing */
        if (pop3_store->cache == NULL
            || (stream = camel_data_cache_add(pop3_store->cache, "cache", fi->uid, NULL)) == NULL)
            stream = camel_stream_mem_new();

        /* ref it, the cache storage routine unref's when done */
        camel_object_ref((CamelObject *)stream);
        fi->stream = stream;
        fi->err = EIO;
        pcr = camel_pop3_engine_command_new(pop3_store->engine, CAMEL_POP3_COMMAND_MULTI, cmd_tocache, fi, "RETR %u\r\n", fi->id);

        /* Also initiate retrieval of all following messages, assume we'll be receiving them */
        if (pop3_store->cache != NULL) {
            i = fi_to_index(pop3_folder, fi)+1;
            for (;i<pop3_folder->uids->len;i++) {
                CamelPOP3FolderInfo *pfi = pop3_folder->uids->pdata[i];
                
                if (pfi->uid && pfi->cmd == NULL) {
                    pfi->stream = camel_data_cache_add(pop3_store->cache, "cache", pfi->uid, NULL);
                    if (pfi->stream) {
                        pfi->err = EIO;
                        pfi->cmd = camel_pop3_engine_command_new(pop3_store->engine, CAMEL_POP3_COMMAND_MULTI,
                                             cmd_tocache, pfi, "RETR %u\r\n", pfi->id);
                    }
                }
            }
        }

        /* now wait for the first one to finish */
        while ((i = camel_pop3_engine_iterate(pop3_store->engine, pcr)) > 0)
            ;

        if (i == -1)
            fi->err = errno;

        /* getting error code? */
        ok = pcr->state == CAMEL_POP3_COMMAND_DATA;
        camel_pop3_engine_command_free(pop3_store->engine, pcr);
        camel_stream_reset(stream);

        /* Check to see we have safely written flag set */
        if (fi->err != 0) {
            if (fi->err == EINTR)
                camel_exception_setv(ex, CAMEL_EXCEPTION_USER_CANCEL, _("User cancelled"));
            else
                camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot get message %s: %s"), uid, strerror(fi->err));
            goto done;
        }

        if (camel_stream_read(stream, buffer, 1) != 1
            || buffer[0] != '#') {
            camel_exception_setv(ex, CAMEL_EXCEPTION_FOLDER_INVALID_UID,
                         _("Cannot get message %s: %s"), uid, _("Unknown reason"));
            goto done;
        }
    }

    message = camel_mime_message_new ();
    if (camel_data_wrapper_construct_from_stream((CamelDataWrapper *)message, stream) == -1) {
        if (errno == EINTR)
            camel_exception_setv(ex, CAMEL_EXCEPTION_USER_CANCEL, _("User cancelled"));
        else
            camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot get message %s: %s"), uid, strerror(errno));
        camel_object_unref((CamelObject *)message);
        message = NULL;
    }
done:
    camel_object_unref((CamelObject *)stream);
fail:
    camel_operation_end(NULL);

    return message;
}

static void
pop3_set_message_flags (CamelFolder *folder, const char *uid, guint32 flags, guint32 set)
{
    CamelPOP3Folder *pop3_folder = CAMEL_POP3_FOLDER (folder);
    CamelPOP3FolderInfo *fi;

    fi = uid_to_fi(pop3_folder, uid);
    if (fi)
        fi->flags = (fi->flags & ~flags) | (set & flags);
}

static gint
pop3_get_message_count (CamelFolder *folder)
{
    CamelPOP3Folder *pop3_folder = CAMEL_POP3_FOLDER (folder);
    
    return pop3_folder->uids->len;
}

static GPtrArray *
pop3_get_uids (CamelFolder *folder)
{
    CamelPOP3Folder *pop3_folder = CAMEL_POP3_FOLDER (folder);
    GPtrArray *uids = g_ptr_array_new();
    CamelPOP3FolderInfo **fi = (CamelPOP3FolderInfo **)pop3_folder->uids->pdata;
    int i;

    for (i=0;i<pop3_folder->uids->len;i++,fi++) {
        if (fi[0]->uid)
            g_ptr_array_add(uids, fi[0]->uid);
    }
    
    return uids;
}