path: root/camel/camel-mime-part.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; fill-column: 160 -*- */
/* camelMimePart.c : Abstract class for a mime_part */

/* 
 * Authors: Bertrand Guiheneuf <bertrand@helixcode.com>
 *      Michael Zucchi <notzed@helixcode.com>
 *
 * Copyright 1999, 2000 Helix Code, Inc. (http://www.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 <string.h>
#include "camel-mime-part.h"
#include <stdio.h>
#include "gmime-content-field.h"
#include "string-utils.h"
#include "hash-table-utils.h"
#include "camel-mime-part-utils.h"
#include <ctype.h>
#include "camel-mime-parser.h"
#include "camel-stream-mem.h"
#include "camel-stream-filter.h"
#include "camel-mime-filter-basic.h"
#include "camel-mime-filter-crlf.h"
#include "camel-exception.h"

#define d(x)

typedef enum {
    HEADER_UNKNOWN,
    HEADER_DESCRIPTION,
    HEADER_DISPOSITION,
    HEADER_CONTENT_ID,
    HEADER_ENCODING,
    HEADER_CONTENT_MD5,
    HEADER_CONTENT_LANGUAGES,
    HEADER_CONTENT_TYPE
} CamelHeaderType;


static GHashTable *header_name_table;


static CamelMediumClass *parent_class=NULL;

/* Returns the class for a CamelMimePart */
#define CMP_CLASS(so) CAMEL_MIME_PART_CLASS (CAMEL_OBJECT_GET_CLASS(so))
#define CDW_CLASS(so) CAMEL_DATA_WRAPPER_CLASS (CAMEL_OBJECT_GET_CLASS(so))
#define CMD_CLASS(so) CAMEL_MEDIUM_CLASS (CAMEL_OBJECT_GET_CLASS(so))

/* from CamelDataWrapper */
static int             write_to_stream                 (CamelDataWrapper *data_wrapper, CamelStream *stream);
static int         construct_from_stream           (CamelDataWrapper *dw, CamelStream *s);

/* from CamelMedia */ 
static void            add_header                      (CamelMedium *medium, const char *header_name, const void *header_value);
static void            set_header                      (CamelMedium *medium, const char *header_name, const void *header_value);
static void            remove_header                   (CamelMedium *medium, const char *header_name);
static const void     *get_header                      (CamelMedium *medium, const char *header_name);

static void            set_content_object              (CamelMedium *medium, CamelDataWrapper *content);

/* from camel mime parser */
static int             construct_from_parser           (CamelMimePart *, CamelMimeParser *);

/* forward references */
static void set_disposition (CamelMimePart *mime_part, const gchar *disposition);


/* loads in a hash table the set of header names we */
/* recognize and associate them with a unique enum  */
/* identifier (see CamelHeaderType above)           */
static void
init_header_name_table()
{
    header_name_table = g_hash_table_new (g_strcase_hash, g_strcase_equal);
    g_hash_table_insert (header_name_table, "Content-Description", (gpointer)HEADER_DESCRIPTION);
    g_hash_table_insert (header_name_table, "Content-Disposition", (gpointer)HEADER_DISPOSITION);
    g_hash_table_insert (header_name_table, "Content-id", (gpointer)HEADER_CONTENT_ID);
    g_hash_table_insert (header_name_table, "Content-Transfer-Encoding", (gpointer)HEADER_ENCODING);
    g_hash_table_insert (header_name_table, "Content-MD5", (gpointer)HEADER_CONTENT_MD5);
    g_hash_table_insert (header_name_table, "Content-Type", (gpointer)HEADER_CONTENT_TYPE);
    
}

static void
camel_mime_part_class_init (CamelMimePartClass *camel_mime_part_class)
{
    CamelMediumClass *camel_medium_class = CAMEL_MEDIUM_CLASS (camel_mime_part_class);
    CamelDataWrapperClass *camel_data_wrapper_class = CAMEL_DATA_WRAPPER_CLASS (camel_mime_part_class);

    parent_class = CAMEL_MEDIUM_CLASS (camel_type_get_global_classfuncs (camel_medium_get_type ()));
    init_header_name_table();

    camel_mime_part_class->construct_from_parser = construct_from_parser;
    
    /* virtual method overload */   
    camel_medium_class->add_header                = add_header;
    camel_medium_class->set_header                = set_header;
    camel_medium_class->get_header                = get_header;
    camel_medium_class->remove_header             = remove_header;
    camel_medium_class->set_content_object        = set_content_object;

    camel_data_wrapper_class->write_to_stream     = write_to_stream;
    camel_data_wrapper_class->construct_from_stream= construct_from_stream;
}

static void
camel_mime_part_init (gpointer   object,  gpointer   klass)
{
    CamelMimePart *camel_mime_part = CAMEL_MIME_PART (object);
    
    camel_mime_part->content_type         = gmime_content_field_new ("text", "plain");
    camel_mime_part->description          = NULL;
    camel_mime_part->disposition          = NULL;
    camel_mime_part->content_id           = NULL;
    camel_mime_part->content_MD5          = NULL;
    camel_mime_part->content_languages    = NULL;
    camel_mime_part->encoding             = CAMEL_MIME_PART_ENCODING_DEFAULT;

    camel_mime_part->temp_message_buffer  = NULL;   
    camel_mime_part->content_input_stream = NULL;
}


static void           
camel_mime_part_finalize (CamelObject *object)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (object);

    g_free (mime_part->description);
    g_free (mime_part->content_id);
    g_free (mime_part->content_MD5);
    string_list_free (mime_part->content_languages);
    header_disposition_unref(mime_part->disposition);
    
    if (mime_part->content_type) gmime_content_field_unref (mime_part->content_type);
    if (mime_part->temp_message_buffer) g_byte_array_free (mime_part->temp_message_buffer, TRUE);

    if (mime_part->content_input_stream) camel_object_unref (CAMEL_OBJECT (mime_part->content_input_stream));

    header_raw_clear(&mime_part->headers);
}



CamelType
camel_mime_part_get_type (void)
{
    static CamelType camel_mime_part_type = CAMEL_INVALID_TYPE;
    
    if (camel_mime_part_type == CAMEL_INVALID_TYPE) {
        camel_mime_part_type = camel_type_register (CAMEL_MEDIUM_TYPE, "CamelMimePart",
                                sizeof (CamelMimePart),
                                sizeof (CamelMimePartClass),
                                (CamelObjectClassInitFunc) camel_mime_part_class_init,
                                NULL,
                                (CamelObjectInitFunc) camel_mime_part_init,
                                (CamelObjectFinalizeFunc) camel_mime_part_finalize);
    }
    
    return camel_mime_part_type;
}


/* **** */

static gboolean
process_header(CamelMedium *medium, const char *header_name, const char *header_value)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (medium);
    CamelHeaderType header_type;
    char *text;

    /* Try to parse the header pair. If it corresponds to something   */
    /* known, the job is done in the parsing routine. If not,         */
    /* we simply add the header in a raw fashion                      */

    /* FIXMME: MUST check fields for validity before adding them! */

    header_type = (CamelHeaderType) g_hash_table_lookup (header_name_table, header_name);
    switch (header_type) {
    case HEADER_DESCRIPTION: /* raw header->utf8 conversion */
        text = header_decode_string(header_value);
        g_free(mime_part->description);
        mime_part->description = text;
        break;
    case HEADER_DISPOSITION:
        set_disposition (mime_part, header_value);
        break;
    case HEADER_CONTENT_ID:
        text = header_msgid_decode(header_value);
        g_free(mime_part->content_id);
        mime_part->content_id = text;
        break;
    case HEADER_ENCODING:
        text = header_token_decode(header_value);
        mime_part->encoding = camel_mime_part_encoding_from_string (text);
        g_free(text);
        break;
    case HEADER_CONTENT_MD5:
        g_free(mime_part->content_MD5);
        mime_part->content_MD5 = g_strdup(header_value);
        break;
    case HEADER_CONTENT_TYPE: 
        gmime_content_field_construct_from_string (mime_part->content_type, header_value);
        break;
    default:
        return FALSE;
    }
    return TRUE;
}


static void
set_header (CamelMedium *medium, const char *header_name, const void *header_value)
{
    CamelMimePart *part = (CamelMimePart *)medium;

    process_header(medium, header_name, header_value);
    header_raw_replace(&part->headers, header_name, header_value, -1);
}

static void
add_header (CamelMedium *medium, const char *header_name, const void *header_value)
{
    CamelMimePart *part = (CamelMimePart *)medium;

    /* Try to parse the header pair. If it corresponds to something   */
    /* known, the job is done in the parsing routine. If not,         */
    /* we simply add the header in a raw fashion                      */

    /* FIXMME: MUST check fields for validity before adding them! */

    /* If it was one of the headers we handled, it must be unique, set it instead of add */
    if (process_header(medium, header_name, header_value))
        header_raw_replace(&part->headers, header_name, header_value, -1);
    else
        header_raw_append(&part->headers, header_name, header_value, -1);
}

static void
remove_header (CamelMedium *medium, const char *header_name)
{
    CamelMimePart *part = (CamelMimePart *)medium;

    process_header(medium, header_name, NULL);
    header_raw_remove(&part->headers, header_name);
}

static const void *
get_header (CamelMedium *medium, const char *header_name)
{
    CamelMimePart *part = (CamelMimePart *)medium;

    return header_raw_find(&part->headers, header_name, NULL);
}


/* **** Content-Description */
void
camel_mime_part_set_description (CamelMimePart *mime_part, const gchar *description)
{
    camel_medium_set_header (CAMEL_MEDIUM (mime_part),
                 "Content-Description", description);
}

const gchar *
camel_mime_part_get_description (CamelMimePart *mime_part)
{
    return mime_part->description;
}

/* **** Content-Disposition */

static void
set_disposition (CamelMimePart *mime_part, const gchar *disposition)
{
    header_disposition_unref(mime_part->disposition);
    if (disposition)
        mime_part->disposition = header_disposition_decode(disposition);
    else
        mime_part->disposition = NULL;
}


void
camel_mime_part_set_disposition (CamelMimePart *mime_part, const gchar *disposition)
{
    char *text;

    /* we poke in a new disposition (so we dont lose 'filename', etc) */
    if (mime_part->disposition == NULL) {
        set_disposition(mime_part, disposition);
    }
    if (mime_part->disposition != NULL) {
        g_free(mime_part->disposition->disposition);
        mime_part->disposition->disposition = g_strdup(disposition);
    }
    text = header_disposition_format(mime_part->disposition);

    camel_medium_set_header (CAMEL_MEDIUM (mime_part),
                 "Content-Disposition", text);

    g_free(text);
}

const gchar *
camel_mime_part_get_disposition (CamelMimePart *mime_part)
{
    if (mime_part->disposition)
        return (mime_part->disposition)->disposition;
    else
        return NULL;
}


/* **** Content-Disposition: filename="xxx" */

void
camel_mime_part_set_filename (CamelMimePart *mime_part, const gchar *filename)
{
    char *str;
    if (mime_part->disposition == NULL)
        mime_part->disposition = header_disposition_decode("attachment");

    header_set_param(&mime_part->disposition->params, "filename", filename);
    str = header_disposition_format(mime_part->disposition);

    camel_medium_set_header (CAMEL_MEDIUM (mime_part),
                 "Content-Disposition", str);
    g_free(str);
}

const gchar *
camel_mime_part_get_filename (CamelMimePart *mime_part)
{
    if (mime_part->disposition)
        return header_param(mime_part->disposition->params, "filename");
    return NULL;
}


/* **** Content-ID: */

void
camel_mime_part_set_content_id (CamelMimePart *mime_part, const char *contentid)
{
    camel_medium_set_header (CAMEL_MEDIUM (mime_part), "Content-ID",
                 contentid);
}

const gchar *
camel_mime_part_get_content_id (CamelMimePart *mime_part)
{
    return mime_part->content_id;
}

/* **** Content-MD5: */

void
camel_mime_part_set_content_MD5 (CamelMimePart *mime_part, const char *md5)
{
    camel_medium_set_header (CAMEL_MEDIUM (mime_part), "Content-MD5", md5);
}

const gchar *
camel_mime_part_get_content_MD5 (CamelMimePart *mime_part)
{
    return mime_part->content_MD5;
}

/* **** Content-Transfer-Encoding: */

void
camel_mime_part_set_encoding (CamelMimePart *mime_part,
                  CamelMimePartEncodingType encoding)
{
    const char *text;

    text = camel_mime_part_encoding_to_string (encoding);
    camel_medium_set_header (CAMEL_MEDIUM (mime_part),
                 "Content-Transfer-Encoding", text);
}

const CamelMimePartEncodingType
camel_mime_part_get_encoding (CamelMimePart *mime_part)
{
    return mime_part->encoding;
}

/* FIXME: do something with this stuff ... */

void
camel_mime_part_set_content_languages (CamelMimePart *mime_part, GList *content_languages)
{
    if (mime_part->content_languages) string_list_free (mime_part->content_languages);
    mime_part->content_languages = content_languages;

    /* FIXME: translate to a header and set it */
}

const GList *
camel_mime_part_get_content_languages (CamelMimePart *mime_part)
{
    return mime_part->content_languages;
}


/* **** */

/* **** Content-Type: */

void 
camel_mime_part_set_content_type (CamelMimePart *mime_part, gchar *content_type)
{
    camel_medium_set_header (CAMEL_MEDIUM (mime_part),
                 "Content-Type", content_type);
}

GMimeContentField *
camel_mime_part_get_content_type (CamelMimePart *mime_part)
{
    return mime_part->content_type;
}

/*********/



static void
set_content_object (CamelMedium *medium, CamelDataWrapper *content)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (medium);
    GMimeContentField *object_content_field;

    parent_class->set_content_object (medium, content);

    object_content_field = camel_data_wrapper_get_mime_type_field (content);
    if (mime_part->content_type &&
        (mime_part->content_type != object_content_field)) {
        char *txt;

        txt = header_content_type_format(object_content_field?object_content_field->content_type:NULL);
        camel_medium_set_header (CAMEL_MEDIUM (mime_part),
                     "Content-Type", txt);
    }
}

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

static int
write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{
    CamelMimePart *mp = CAMEL_MIME_PART (data_wrapper);
    CamelMedium *medium = CAMEL_MEDIUM (data_wrapper);
    CamelDataWrapper *content;
    int total = 0;
    int count;

    d(printf("mime_part::write_to_stream\n"));

    /* FIXME: something needs to be done about this ... */
    /* FIXME: need to count these bytes too */
#ifndef NO_WARNINGS
#warning content-languages should be stored as a header
#endif

    if (mp->headers) {
        struct _header_raw *h = mp->headers;
        while (h) {
            count = camel_stream_printf(stream, "%s%s%s\n", h->name, isspace(h->value[0]) ? ":" : ": ", h->value);
            if (count == -1)
                return -1;
            total += count;
            h = h->next;
        }
    }

    count = camel_stream_write (stream, "\n", 1);
    if (count == -1)
        return -1;
    total += count;

    content = camel_medium_get_content_object (medium);
    if (content) {
        /* I dont really like this here, but i dont know where else it might go ... */
#define CAN_THIS_GO_ELSEWHERE
#ifdef CAN_THIS_GO_ELSEWHERE
        CamelMimeFilter *filter = NULL;
        CamelStreamFilter *filter_stream = NULL;

        switch(mp->encoding) {
        case CAMEL_MIME_PART_ENCODING_BASE64:
            filter = (CamelMimeFilter *)camel_mime_filter_basic_new_type(CAMEL_MIME_FILTER_BASIC_BASE64_ENC);
            break;
        case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
            filter = (CamelMimeFilter *)camel_mime_filter_basic_new_type(CAMEL_MIME_FILTER_BASIC_QP_ENC);
            break;
        default:
            break;
        }
        if (filter) {
            filter_stream = camel_stream_filter_new_with_stream(stream);
            if (gmime_content_field_is_type(mp->content_type, "text", "*")) {
                CamelMimeFilter *crlf = camel_mime_filter_crlf_new(CAMEL_MIME_FILTER_CRLF_ENCODE,
                                           CAMEL_MIME_FILTER_CRLF_MODE_CRLF_ONLY);
                char *charset;

                camel_stream_filter_add(filter_stream, crlf);
                camel_object_unref((CamelObject *)crlf);

                charset = gmime_content_field_get_parameter(mp->content_type, "charset");
                if (!(charset == NULL || !strcasecmp(charset, "us-ascii") || !strcasecmp(charset, "utf-8"))) {
                    CamelMimeFilter *charenc;
                    charenc = camel_mime_filter_charset_new("utf-8", charset);
                    camel_stream_filter_add(filter_stream, charenc);
                    /* well some idiot changed the _add function to do its own ref'ing for
                       no decent purpose whatsoever ... */
                    camel_object_unref((CamelObject *)charenc);
                } 
            }
            camel_stream_filter_add(filter_stream, filter);
            camel_object_unref((CamelObject *)filter);
            stream = (CamelStream *)filter_stream;
        }

#endif
        count = camel_data_wrapper_write_to_stream (content, stream);
        if (filter_stream) {
            camel_stream_flush((CamelStream *)filter_stream);
            camel_object_unref((CamelObject *)filter_stream);
        }
        if (count == -1)
            return -1;
        total += count;
    } else {
        g_warning("No content for medium, nothing to write");
    }
    return total;
}

/* mime_part */
static int
construct_from_parser(CamelMimePart *dw, CamelMimeParser *mp)
{
    struct _header_raw *headers;
    char *buf;
    int len;

    d(printf("mime_part::construct_from_parser()\n"));

    switch (camel_mime_parser_step(mp, &buf, &len)) {
    case HSCAN_MESSAGE:
        /* set the default type of a message always */
        gmime_content_field_construct_from_string (dw->content_type, "message/rfc822");
    case HSCAN_HEADER:
    case HSCAN_MULTIPART:
        /* we have the headers, build them into 'us' */
        headers = camel_mime_parser_headers_raw(mp);
        while (headers) {
            camel_medium_add_header((CamelMedium *)dw, headers->name, headers->value);
            headers = headers->next;
        }
        camel_mime_part_construct_content_from_parser(dw, mp);
        break;
    default:
        g_warning("Invalid state encountered???: %d", camel_mime_parser_state(mp));
    }

    d(printf("mime_part::construct_from_parser() leaving\n"));
#ifndef NO_WARNINGS
#warning "Need to work out how to detect a (fatally) bad parse in the parser"
#endif
    return 0;
}

/**
 * camel_mime_part_construct_from_parser:
 * @mime_part: 
 * @mp: 
 * 
 * 
 * 
 * Return value: 
 **/
int
camel_mime_part_construct_from_parser(CamelMimePart *mime_part, CamelMimeParser *mp)
{
    return CMP_CLASS (mime_part)->construct_from_parser (mime_part, mp);
}

static int
construct_from_stream(CamelDataWrapper *dw, CamelStream *s)
{
    CamelMimeParser *mp;
    int ret;

    d(printf("mime_part::construct_from_stream()\n"));

    mp = camel_mime_parser_new();
    if (camel_mime_parser_init_with_stream(mp, s) == -1) {
        g_warning("Cannot create parser for stream");
        ret = -1;
    } else {
        ret = camel_mime_part_construct_from_parser((CamelMimePart *)dw, mp);
    }
    camel_object_unref((CamelObject *)mp);
    return ret;
}


const gchar *
camel_mime_part_encoding_to_string (CamelMimePartEncodingType encoding)
{
    switch (encoding) {
    case CAMEL_MIME_PART_ENCODING_DEFAULT:
    case CAMEL_MIME_PART_ENCODING_7BIT:
        return "7bit";
    case CAMEL_MIME_PART_ENCODING_8BIT:
        return "8bit";
    case CAMEL_MIME_PART_ENCODING_BASE64:
        return "base64";
    case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
        return "quoted-printable";
    default:
        break;
    }
    return "";
}



/* FIXME I am not sure this is the correct way to do this.  */
CamelMimePartEncodingType
camel_mime_part_encoding_from_string (const gchar *string)
{
    if (string == NULL)
        return CAMEL_MIME_PART_ENCODING_DEFAULT;
    else if (strcasecmp (string, "7bit") == 0)
        return CAMEL_MIME_PART_ENCODING_7BIT;
    else if (strcasecmp (string, "8bit") == 0)
        return CAMEL_MIME_PART_ENCODING_8BIT;
    else if (strcasecmp (string, "base64") == 0)
        return CAMEL_MIME_PART_ENCODING_BASE64;
    else if (strcasecmp (string, "quoted-printable") == 0)
        return CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE;
    else
        /* FIXME?  Spit a warning?  */
        return CAMEL_MIME_PART_ENCODING_DEFAULT;
}


/******************************/
/**  Misc utility functions  **/

/**
 * camel_mime_part_new:
 *
 * Return value: a new CamelMimePart
 **/
CamelMimePart *
camel_mime_part_new (void)
{
    return (CamelMimePart *)camel_object_new (CAMEL_MIME_PART_TYPE);
}

/**
 * camel_mime_part_set_content:
 * @camel_mime_part: Mime part
 * @data: data to put into the part
 * @length: length of @data
 * @type: Content-Type of the data
 * 
 * Utility function used to set the content of a mime part object to 
 * be the provided data. If @length is 0, this routine can be used as
 * a way to remove old content (in which case @data and @type are
 * ignored and may be %NULL).
 **/
void 
camel_mime_part_set_content (CamelMimePart *camel_mime_part,
                 const char *data, int length,
                 const char *type) /* why on earth is the type last? */
{
    CamelMedium *medium = CAMEL_MEDIUM (camel_mime_part);

    if (length) {
        CamelDataWrapper *dw;
        CamelStream *stream;

        dw = camel_data_wrapper_new ();
        camel_data_wrapper_set_mime_type (dw, type);
        stream = camel_stream_mem_new_with_buffer (data, length);
        camel_data_wrapper_construct_from_stream (dw, stream);
        camel_object_unref (CAMEL_OBJECT (stream));
        camel_medium_set_content_object (medium, dw);
        camel_object_unref (CAMEL_OBJECT (dw));
    } else {
        if (medium->content)
            camel_object_unref (CAMEL_OBJECT (medium->content));
        medium->content = NULL;
    }
}