path: root/em-format/e-mail-parser-multipart-related.c

/*
 * e-mail-parser-multipart-related.c
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

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

#include <string.h>

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

#include "e-mail-parser-extension.h"
#include "e-mail-part-utils.h"
#include "e-mail-part-image.h"

typedef EMailParserExtension EMailParserMultipartRelated;
typedef EMailParserExtensionClass EMailParserMultipartRelatedClass;

GType e_mail_parser_multipart_related_get_type (void);

G_DEFINE_TYPE (
    EMailParserMultipartRelated,
    e_mail_parser_multipart_related,
    E_TYPE_MAIL_PARSER_EXTENSION)

static const gchar *parser_mime_types[] = {
    "multipart/related",
    NULL
};

static gboolean
empe_mp_related_parse (EMailParserExtension *extension,
                       EMailParser *parser,
                       CamelMimePart *part,
                       GString *part_id,
                       GCancellable *cancellable,
                       GQueue *out_mail_parts)
{
    CamelMultipart *mp;
    CamelMimePart *body_part, *display_part = NULL, *may_display_part;
    CamelContentType *display_content_type;
    gchar *html_body = NULL;
    gint i, nparts, partidlen, displayid = 0;

    mp = (CamelMultipart *) camel_medium_get_content ((CamelMedium *) part);

    if (!CAMEL_IS_MULTIPART (mp))
        return e_mail_parser_parse_part_as (
            parser, part, part_id,
            "application/vnd.evolution.source",
            cancellable, out_mail_parts);

    display_part = e_mail_part_get_related_display_part (part, &displayid);

    if (display_part == NULL)
        return e_mail_parser_parse_part_as (
            parser, part, part_id, "multipart/mixed",
            cancellable, out_mail_parts);

    may_display_part = display_part;

    display_content_type = camel_mime_part_get_content_type (display_part);
    if (display_content_type && camel_content_type_is (display_content_type, "multipart", "alternative")) {
        CamelMultipart *subparts = CAMEL_MULTIPART (camel_medium_get_content ((CamelMedium *) display_part));
        if (subparts) {
            nparts = camel_multipart_get_number (subparts);
            for (i = 0; i < nparts; i++) {
                body_part = camel_multipart_get_part (subparts, i);
                display_content_type = camel_mime_part_get_content_type (body_part);
                if (display_content_type && camel_content_type_is (display_content_type, "text", "html")) {
                    may_display_part = body_part;
                    break;
                }
            }
        }
    }

    display_content_type = camel_mime_part_get_content_type (may_display_part);
    if (display_content_type &&
        camel_content_type_is (display_content_type, "text", "html")) {
        CamelDataWrapper *dw;

        dw = camel_medium_get_content ((CamelMedium *) may_display_part);
        if (dw) {
            CamelStream *mem = camel_stream_mem_new ();
            GByteArray *bytes;

            camel_data_wrapper_decode_to_stream_sync (dw, mem, cancellable, NULL);
            camel_stream_close (mem, cancellable, NULL);

            bytes = camel_stream_mem_get_byte_array (CAMEL_STREAM_MEM (mem));
            if (bytes && bytes->len)
                html_body = g_strndup ((const gchar *) bytes->data, bytes->len);

            g_object_unref (mem);
        }
    }

    /* The to-be-displayed part goes first */
    partidlen = part_id->len;
    g_string_append_printf (part_id, ".related.%d", displayid);

    e_mail_parser_parse_part (
        parser, display_part, part_id, cancellable, out_mail_parts);

    g_string_truncate (part_id, partidlen);

    /* Process the related parts */
    nparts = camel_multipart_get_number (mp);
    for (i = 0; i < nparts; i++) {
        GQueue work_queue = G_QUEUE_INIT;
        GList *head, *link;

        body_part = camel_multipart_get_part (mp, i);

        if (body_part == display_part)
            continue;

        g_string_append_printf (part_id, ".related.%d", i);

        e_mail_parser_parse_part (
            parser, body_part, part_id,
            cancellable, &work_queue);

        g_string_truncate (part_id, partidlen);

        head = g_queue_peek_head_link (&work_queue);

        for (link = head; link != NULL; link = g_list_next (link)) {
            EMailPart *mail_part = link->data;
            const gchar *cid;

            cid = e_mail_part_get_cid (mail_part);

            /* Don't render the part on its own! */
            if (e_mail_part_utils_body_refers (html_body, cid))
                mail_part->is_hidden = TRUE;
            else if (cid && E_IS_MAIL_PART_IMAGE (mail_part) &&
                 e_mail_part_get_is_attachment (mail_part) &&
                 mail_part->is_hidden) {
                mail_part->is_hidden = FALSE;

                e_mail_parser_wrap_as_attachment (parser, body_part, part_id, &work_queue);
            }
        }

        e_queue_transfer (&work_queue, out_mail_parts);
    }

    g_free (html_body);

    return TRUE;
}

static void
e_mail_parser_multipart_related_class_init (EMailParserExtensionClass *class)
{
    class->mime_types = parser_mime_types;
    class->priority = G_PRIORITY_LOW;
    class->parse = empe_mp_related_parse;
}

static void
e_mail_parser_multipart_related_init (EMailParserExtension *extension)
{
}