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


/* 
 *
 * Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@aful.org> .
 *
 * 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 "camel-mime-message.h"
#include <stdio.h>
#include "gmime-content-field.h"
#include "string-utils.h"
#include "camel-log.h"
#include "gmime-utils.h"
#include "hash-table-utils.h"

typedef enum {
    HEADER_UNKNOWN,
    HEADER_FROM,
    HEADER_REPLY_TO,
    HEADER_SUBJECT,
    HEADER_TO,
    HEADER_CC,
    HEADER_BCC
} CamelHeaderType;

static GHashTable *header_name_table;



static CamelMimePartClass *parent_class=NULL;

static gchar *received_date_str;
static gchar *sent_date_str;
static gchar *reply_to_str;
static gchar *subject_str;
static gchar *from_str;

static void _set_received_date (CamelMimeMessage *mime_message, gchar *received_date);
static const gchar *_get_received_date (CamelMimeMessage *mime_message);
static const gchar *_get_sent_date (CamelMimeMessage *mime_message);
static void _set_reply_to (CamelMimeMessage *mime_message, gchar *reply_to);
static const gchar *_get_reply_to (CamelMimeMessage *mime_message);
static void _set_subject (CamelMimeMessage *mime_message, gchar *subject);
static const gchar *_get_subject (CamelMimeMessage *mime_message);
static void _set_from (CamelMimeMessage *mime_message, gchar *from);
static const gchar *_get_from (CamelMimeMessage *mime_message);
static void _add_recipient (CamelMimeMessage *mime_message, gchar *recipient_type, gchar *recipient); 
static void _remove_recipient (CamelMimeMessage *mime_message, const gchar *recipient_type, const gchar *recipient);
static const GList *_get_recipients (CamelMimeMessage *mime_message, const gchar *recipient_type);
static void _set_flag (CamelMimeMessage *mime_message, const gchar *flag, gboolean value);
static gboolean _get_flag (CamelMimeMessage *mime_message, const gchar *flag);
static GList *_get_flag_list (CamelMimeMessage *mime_message);
static void _set_message_number (CamelMimeMessage *mime_message, guint number);
static guint _get_message_number (CamelMimeMessage *mime_message);
static void _write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream);
static gboolean _parse_header_pair (CamelMimePart *mime_part, gchar *header_name, gchar *header_value);
static void _finalize (GtkObject *object);

/* Returns the class for a CamelMimeMessage */
#define CMM_CLASS(so) CAMEL_MIME_MESSAGE_CLASS (GTK_OBJECT(so)->klass)
#define CDW_CLASS(so) CAMEL_DATA_WRAPPER_CLASS (GTK_OBJECT(so)->klass)


static void
_init_header_name_table()
{
    header_name_table = g_hash_table_new (g_str_hash, g_str_equal);
    g_hash_table_insert (header_name_table, "From", (gpointer)HEADER_FROM);
    g_hash_table_insert (header_name_table, "Reply-To", (gpointer)HEADER_REPLY_TO);
    g_hash_table_insert (header_name_table, "Subject", (gpointer)HEADER_SUBJECT);
    g_hash_table_insert (header_name_table, "To", (gpointer)HEADER_TO);
    g_hash_table_insert (header_name_table, "Cc", (gpointer)HEADER_CC);
    g_hash_table_insert (header_name_table, "Bcc", (gpointer)HEADER_BCC);
    
}

static void
camel_mime_message_class_init (CamelMimeMessageClass *camel_mime_message_class)
{
    CamelDataWrapperClass *camel_data_wrapper_class = CAMEL_DATA_WRAPPER_CLASS (camel_mime_message_class);
    CamelMimePartClass *camel_mime_part_class = CAMEL_MIME_PART_CLASS (camel_mime_message_class);
    GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_mime_message_class);
    
    parent_class = gtk_type_class (camel_mime_part_get_type ());
    _init_header_name_table();
    
    received_date_str = "";
    sent_date_str = "";
    reply_to_str = "Reply-To";
    subject_str = "Subject";
    from_str = "From";
    
    /* virtual method definition */
    camel_mime_message_class->set_received_date = _set_received_date;
    camel_mime_message_class->get_received_date = _get_received_date;
    camel_mime_message_class->get_sent_date = _get_sent_date;
    camel_mime_message_class->set_reply_to = _set_reply_to;
    camel_mime_message_class->get_reply_to = _get_reply_to;
    camel_mime_message_class->set_subject = _set_subject;
    camel_mime_message_class->get_subject = _get_subject;
    camel_mime_message_class->set_from = _set_from;
    camel_mime_message_class->get_from = _get_from;
    camel_mime_message_class->add_recipient = _add_recipient; 
    camel_mime_message_class->remove_recipient = _remove_recipient;
    camel_mime_message_class->get_recipients = _get_recipients;
    camel_mime_message_class->set_flag = _set_flag;
    camel_mime_message_class->get_flag = _get_flag;
    camel_mime_message_class->get_flag_list = _get_flag_list;
    camel_mime_message_class->set_message_number = _set_message_number;
    camel_mime_message_class->get_message_number = _get_message_number;
    
    /* virtual method overload */
    camel_data_wrapper_class->write_to_stream = _write_to_stream;
    camel_mime_part_class->parse_header_pair = _parse_header_pair;
    
    gtk_object_class->finalize = _finalize;
}




static void
camel_mime_message_init (gpointer object, gpointer klass)
{
    CamelMimeMessage *camel_mime_message = CAMEL_MIME_MESSAGE (object);
    
    camel_mime_message->recipients =  g_hash_table_new (g_strcase_hash, g_strcase_equal);
    camel_mime_message->flags = g_hash_table_new (g_strcase_hash, g_strcase_equal);
    
    camel_mime_message->received_date = NULL;
    camel_mime_message->sent_date = NULL;
    camel_mime_message->subject = NULL;
    camel_mime_message->reply_to = NULL;
    camel_mime_message->from = NULL;
    camel_mime_message->folder = NULL;
    camel_mime_message->session = NULL;
}

GtkType
camel_mime_message_get_type (void)
{
    static GtkType camel_mime_message_type = 0;
    
    if (!camel_mime_message_type)   {
        GtkTypeInfo camel_mime_message_info =   
        {
            "CamelMimeMessage",
            sizeof (CamelMimeMessage),
            sizeof (CamelMimeMessageClass),
            (GtkClassInitFunc) camel_mime_message_class_init,
            (GtkObjectInitFunc) camel_mime_message_init,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };
        
        camel_mime_message_type = gtk_type_unique (camel_mime_part_get_type (), &camel_mime_message_info);
    }
    
    return camel_mime_message_type;
}


static void           
_finalize (GtkObject *object)
{
    CamelMimeMessage *message = CAMEL_MIME_MESSAGE (object);
    
    CAMEL_LOG_FULL_DEBUG ("Entering CamelMimeMessage::finalize\n");
    g_free (message->received_date);
    g_free (message->sent_date);
    g_free (message->subject);
    g_free (message->reply_to);
    g_free (message->from);
    
#warning free recipients.
    if (message->folder) gtk_object_unref (GTK_OBJECT (message->folder));
    if (message->session) gtk_object_unref (GTK_OBJECT (message->session));
    
    if (message->flags)
        g_hash_table_foreach (message->flags, g_hash_table_generic_free, NULL);
    
    GTK_OBJECT_CLASS (parent_class)->finalize (object);
    CAMEL_LOG_FULL_DEBUG ("Leaving CamelMimeMessage::finalize\n");
}



CamelMimeMessage *
camel_mime_message_new_with_session (CamelSession *session) 
{
    CamelMimeMessage *mime_message;
    mime_message = gtk_type_new (CAMEL_MIME_MESSAGE_TYPE);
    mime_message->session = session;
    if (session) gtk_object_ref (GTK_OBJECT (session));
    
    return mime_message;
}


/* some utils func */

static void
_set_field (CamelMimeMessage *mime_message, gchar *name, gchar *value, gchar **variable)
{
    if (variable) {
        g_free (*variable);
        *variable = value;
    }
}

/* for future use */
/* for the moment, only @variable is used */
static gchar *
_get_field (CamelMimeMessage *mime_message, gchar *name, gchar *variable)
{
    return variable;
}

static gboolean
_check_not_expunged (CamelMimeMessage *mime_message)
{
    if (mime_message->expunged) {
        CAMEL_LOG_WARNING ("CamelMimeMessage:: An invalid operation has been tempted on an expunged message\n");
    }
    return (!mime_message->expunged);
}

/* * */


static void
_set_received_date (CamelMimeMessage *mime_message, gchar *received_date)
{
    _set_field (mime_message, received_date_str, received_date, &(mime_message->received_date));
}

void
camel_mime_message_set_received_date (CamelMimeMessage *mime_message, gchar *received_date)
{
    g_assert (mime_message);
    g_return_if_fail (_check_not_expunged (mime_message));
    CMM_CLASS (mime_message)->set_received_date (mime_message, received_date);
}


static const gchar *
_get_received_date (CamelMimeMessage *mime_message)
{
    return _get_field (mime_message, received_date_str, mime_message->received_date);
}

const gchar *
camel_mime_message_get_received_date (CamelMimeMessage *mime_message)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), NULL);
    return CMM_CLASS (mime_message)->get_received_date (mime_message);
}


static const gchar *
_get_sent_date (CamelMimeMessage *mime_message)
{
    return _get_field (mime_message, sent_date_str, mime_message->sent_date);
}

const gchar *
camel_mime_message_get_sent_date (CamelMimeMessage *mime_message)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), NULL);
    return CMM_CLASS (mime_message)->get_sent_date (mime_message);
}


static void
_set_reply_to (CamelMimeMessage *mime_message, gchar *reply_to)
{
    _set_field (mime_message, reply_to_str, reply_to, &(mime_message->reply_to));
}

void
camel_mime_message_set_reply_to (CamelMimeMessage *mime_message, gchar *reply_to)
{
    g_assert (mime_message);
    g_return_if_fail (_check_not_expunged (mime_message));
    CMM_CLASS (mime_message)->set_reply_to (mime_message, reply_to);
}


static const gchar *
_get_reply_to (CamelMimeMessage *mime_message)
{
    return _get_field (mime_message, reply_to_str, mime_message->reply_to);
}

const gchar *
camel_mime_message_get_reply_to (CamelMimeMessage *mime_message)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), NULL);
    return CMM_CLASS (mime_message)->get_reply_to (mime_message);
}




static void
_set_subject (CamelMimeMessage *mime_message, gchar *subject)
{
    _set_field (mime_message, subject_str, subject, &(mime_message->subject));
}

void
camel_mime_message_set_subject (CamelMimeMessage *mime_message, gchar *subject)
{
    g_assert (mime_message);
    g_return_if_fail (_check_not_expunged (mime_message));
    CMM_CLASS (mime_message)->set_subject (mime_message, subject);
}


static const gchar *
_get_subject (CamelMimeMessage *mime_message)
{
    return _get_field (mime_message, subject_str, mime_message->subject);
}

const gchar *
camel_mime_message_get_subject (CamelMimeMessage *mime_message)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), NULL);
    return CMM_CLASS (mime_message)->get_subject (mime_message);
}




static void
_set_from (CamelMimeMessage *mime_message, gchar *from)
{
    _set_field (mime_message, from_str, from, &(mime_message->from));
}

void
camel_mime_message_set_from (CamelMimeMessage *mime_message, gchar *from)
{
    g_assert (mime_message);
    g_return_if_fail (_check_not_expunged (mime_message));
    CMM_CLASS (mime_message)->set_from (mime_message, from);
}


static const gchar *
_get_from (CamelMimeMessage *mime_message)
{
    return _get_field (mime_message, from_str, mime_message->from);
}

const gchar *
camel_mime_message_get_from (CamelMimeMessage *mime_message)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), NULL);
    return CMM_CLASS (mime_message)->get_from (mime_message);
}






static void
_add_recipient (CamelMimeMessage *mime_message, gchar *recipient_type, gchar *recipient) 
{
    /* be careful, recipient_type and recipient may be freed within this func */
    GList *recipients_list;
    GList *existent_list;
    
    /* see if there is already a list for this recipient type */
    existent_list = (GList *)g_hash_table_lookup (mime_message->recipients, recipient_type);
    
    /* if the recipient is already in this list, do nothing */
    if ( existent_list && g_list_find_custom (existent_list, (gpointer)recipient, string_equal_for_glist) ) {
        g_free (recipient_type);
        g_free (recipient);
        return;
    }
    /* append the new recipient to the recipient list
       if the existent_list is NULL, then a new GList is
       automagically created */ 
    recipients_list = g_list_append (existent_list, (gpointer)recipient);
    
    if (!existent_list) /* if there was no recipient of this type create the section */
        g_hash_table_insert (mime_message->recipients, recipient_type, recipients_list);
    else 
        g_free (recipient_type);
}


/**
 * add_recipient:
 * @mime_message: 
 * @recipient_type: 
 * @recipient: 
 * 
 * Have to write the doc. IMPORTANT : @recipient_type and 
 * @recipient may be freed within this func
 **/
void
camel_mime_message_add_recipient (CamelMimeMessage *mime_message, gchar *recipient_type, gchar *recipient) 
{
    g_assert (mime_message);
    g_return_if_fail (_check_not_expunged (mime_message));
    CMM_CLASS (mime_message)->add_recipient (mime_message, recipient_type, recipient);
}


/**
 * _remove_recipient: remove a recipient from the list of recipients
 * @mime_message: the message
 * @recipient_type: recipient type from which the recipient should be removed
 * @recipient: recipient to remove
 * 
 * Be careful, recipient and recipient_type are not freed. 
 * calling programns must free them themselves. They can free
 * them just after remove_recipient returns.
 **/
static void
_remove_recipient (CamelMimeMessage *mime_message, const gchar *recipient_type, const gchar *recipient) 
{
    GList *recipients_list;
    GList *new_recipients_list;
    GList *old_element;
    gchar *old_recipient_type;
    
    /* if the recipient type section does not exist, do nothing */
    if (! g_hash_table_lookup_extended (mime_message->recipients, 
                        recipient_type, 
                        (gpointer)&(old_recipient_type),
                        (gpointer)&(recipients_list)) 
        ) return;
    
    /* look for the recipient to remove */
    /* g_list_find_custom does use "const" for recipient, is it a mistake ? */
    old_element = g_list_find_custom (recipients_list, recipient, g_str_equal);
    if (old_element) {
        /* if recipient exists, remove it */
        new_recipients_list =  g_list_remove_link (recipients_list, old_element);
        
        /* if glist head has changed, fix up hash table */
        if (new_recipients_list != recipients_list)
            g_hash_table_insert (mime_message->recipients, old_recipient_type, new_recipients_list);
        
        g_free( (gchar *)(old_element->data));
        g_list_free_1 (old_element);
    }
}


void
camel_mime_message_remove_recipient (CamelMimeMessage *mime_message, const gchar *recipient_type, const gchar *recipient) 
{
    g_assert (mime_message);
    g_return_if_fail (_check_not_expunged (mime_message));
    CMM_CLASS (mime_message)->remove_recipient (mime_message, recipient_type, recipient);
}


static const GList *
_get_recipients (CamelMimeMessage *mime_message, const gchar *recipient_type)
{
    return (GList *)g_hash_table_lookup (mime_message->recipients, recipient_type);
}

const GList *
camel_mime_message_get_recipients (CamelMimeMessage *mime_message, const gchar *recipient_type)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), NULL);
    return CMM_CLASS (mime_message)->get_recipients (mime_message, recipient_type);
}


static void
_set_flag (CamelMimeMessage *mime_message, const gchar *flag, gboolean value)
{
    gchar *old_flags;
    gboolean ptr_value;

    if (! g_hash_table_lookup_extended (mime_message->flags, 
                        flag, 
                        (gpointer)&(old_flags),
                        (gpointer)&(ptr_value)) ) {
        
        g_hash_table_insert (mime_message->flags, g_strdup (flag), GINT_TO_POINTER (value));
    } else 
        g_hash_table_insert (mime_message->flags, old_flags, GINT_TO_POINTER (value));
    
}

void
camel_mime_message_set_flag (CamelMimeMessage *mime_message, const gchar *flag, gboolean value)
{
    g_assert (mime_message);
    g_return_if_fail (_check_not_expunged (mime_message));
    CMM_CLASS (mime_message)->set_flag (mime_message, flag, value);
}



static gboolean 
_get_flag (CamelMimeMessage *mime_message, const gchar *flag)
{
    return GPOINTER_TO_INT (g_hash_table_lookup (mime_message->flags, flag));
}

gboolean 
camel_mime_message_get_flag (CamelMimeMessage *mime_message, const gchar *flag)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), FALSE);
    return CMM_CLASS (mime_message)->get_flag (mime_message, flag);
}



static void
_add_flag_to_list (gpointer key, gpointer value, gpointer user_data)
{
    GList **flag_list = (GList **)user_data;
    gchar *flag_name = (gchar *)key;
    
    if ((flag_name) && (flag_name[0] != '\0'))
        *flag_list = g_list_append (*flag_list, flag_name);
}

static GList *
_get_flag_list (CamelMimeMessage *mime_message)
{
    GList *flag_list = NULL;
    
    if (mime_message->flags)
        g_hash_table_foreach (mime_message->flags, _add_flag_to_list, &flag_list);
    return flag_list;
}


GList *
camel_mime_message_get_flag_list (CamelMimeMessage *mime_message)
{
    g_assert (mime_message);
    g_return_val_if_fail (_check_not_expunged (mime_message), NULL);
    return CMM_CLASS (mime_message)->get_flag_list (mime_message);
}



static void 
_set_message_number (CamelMimeMessage *mime_message, guint number)
{
    mime_message->message_number = number;
}

static guint 
_get_message_number (CamelMimeMessage *mime_message)
{
    return mime_message->message_number;
}



guint
camel_mime_message_get_message_number (CamelMimeMessage *mime_message)
{
    return CMM_CLASS (mime_message)->get_message_number (mime_message);
}




#ifdef WHPT
#warning : WHPT is already defined !!!!!!
#endif
#define WHPT gmime_write_header_pair_to_stream

static void
_write_one_recipient_to_stream (gpointer key, gpointer value, gpointer user_data)
{
    gchar *recipient_type = (gchar *)key;
    GList *recipients = (GList *)value;
    //  gchar *current;
    CamelStream *stream = (CamelStream *)user_data;
    if  (recipient_type)
        write_header_with_glist_to_stream (stream, recipient_type, recipients, ", ");
}

static void
_write_recipients_to_stream (CamelMimeMessage *mime_message, CamelStream *stream)
{
    g_hash_table_foreach (mime_message->recipients, _write_one_recipient_to_stream, (gpointer)stream);
}

static void
_write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{
    CamelMimeMessage *mm = CAMEL_MIME_MESSAGE (data_wrapper);
    CAMEL_LOG_FULL_DEBUG ( "CamelMimeMessage::write_to_stream\n");
    CAMEL_LOG_FULL_DEBUG ( "CamelMimeMessage:: Writing \"From\"\n");
    WHPT (stream, "From", mm->from);
    CAMEL_LOG_FULL_DEBUG ( "CamelMimeMessage:: Writing \"Reply-To\"\n");
    WHPT (stream, "Reply-To", mm->reply_to);
    CAMEL_LOG_FULL_DEBUG ( "CamelMimeMessage:: Writing recipients\n");
    _write_recipients_to_stream (mm, stream);
    CAMEL_LOG_FULL_DEBUG ( "CamelMimeMessage:: Writing \"Date\"\n");
    WHPT (stream, "Date", mm->received_date);
    CAMEL_LOG_FULL_DEBUG ( "CamelMimeMessage:: Writing \"Subject\"\n");
    WHPT (stream, "Subject", mm->subject);
    CAMEL_DATA_WRAPPER_CLASS (parent_class)->write_to_stream (data_wrapper, stream);
    
}

/*******************************/
/* mime message header parsing */

static void
_set_recipient_list_from_string (CamelMimeMessage *message, gchar *recipient_type, gchar *recipients_string)
{
    GList *recipients_list;
    CAMEL_LOG_FULL_DEBUG ("CamelMimeMessage::_set_recipient_list_from_string parsing ##%s##\n", recipients_string);
    recipients_list = string_split (
                    recipients_string, ',', "\t ",
                    STRING_TRIM_STRIP_TRAILING | STRING_TRIM_STRIP_LEADING);
    g_hash_table_insert (message->recipients, recipient_type, recipients_list);
    
}

static gboolean
_parse_header_pair (CamelMimePart *mime_part, gchar *header_name, gchar *header_value)
{
    CamelHeaderType header_type;
    CamelMimeMessage *message = CAMEL_MIME_MESSAGE (mime_part);
    gboolean header_handled = FALSE;
    
    
    header_type = (CamelHeaderType) g_hash_table_lookup (header_name_table, header_name);
    switch (header_type) {
        
    case HEADER_FROM:
        CAMEL_LOG_FULL_DEBUG (
                      "CamelMimeMessage::parse_header_pair found HEADER_FROM : %s\n",
                      header_value );
        
        camel_mime_message_set_from (message, header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_REPLY_TO:
        CAMEL_LOG_FULL_DEBUG (
                      "CamelMimeMessage::parse_header_pair found HEADER_REPLY_YO : %s\n",
                      header_value );
        
        camel_mime_message_set_reply_to (message, header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_SUBJECT:
        CAMEL_LOG_FULL_DEBUG (
                      "CamelMimeMessage::parse_header_pair found HEADER_SUBJECT : %s\n",
                      header_value );
        
        camel_mime_message_set_subject (message, header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_TO:
        CAMEL_LOG_FULL_DEBUG (
                      "CamelMimeMessage::parse_header_pair found HEADER_TO : %s\n",
                      header_value );
        
        _set_recipient_list_from_string (message, "To", header_value);
        g_free (header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_CC:
        CAMEL_LOG_FULL_DEBUG (
                      "CamelMimeMessage::parse_header_pair found HEADER_CC : %s\n",
                      header_value );
        
        _set_recipient_list_from_string (message, "Cc", header_value);
        g_free (header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_BCC:
        CAMEL_LOG_FULL_DEBUG (
                      "CamelMimeMessage::parse_header_pair found HEADER_BCC : %s\n",
                      header_value );
        
        _set_recipient_list_from_string (message, "Bcc", header_value);
        g_free (header_value);
        header_handled = TRUE;
        break;
        
        
    }
    if (header_handled) {
        g_free (header_name);
        return TRUE;
    } else
        return parent_class->parse_header_pair (mime_part, header_name, header_value);
    
    
}