path: root/em-format/e-mail-parser-inlinepgp-encrypted.c

/*
 * e-mail-parser-inlinepgp-encrypted.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; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

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

#include "e-mail-format-extensions.h"

#include <em-format/e-mail-parser-extension.h>
#include <em-format/e-mail-parser.h>
#include <em-format/e-mail-part-utils.h>
#include <e-util/e-util.h>

#include <glib/gi18n-lib.h>
#include <camel/camel.h>

#include <string.h>

typedef struct _EMailParserInlinePGPEncrypted {
    GObject parent;
} EMailParserInlinePGPEncrypted;

typedef struct _EMailParserInlinePGPEncryptedClass {
    GObjectClass parent_class;
} EMailParserInlinePGPEncryptedClass;

static void e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface);
static void e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface);

G_DEFINE_TYPE_EXTENDED (
    EMailParserInlinePGPEncrypted,
    e_mail_parser_inline_pgp_encrypted,
    G_TYPE_OBJECT,
    0,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_MAIL_EXTENSION,
        e_mail_parser_mail_extension_interface_init)
    G_IMPLEMENT_INTERFACE (
        E_TYPE_MAIL_PARSER_EXTENSION,
        e_mail_parser_parser_extension_interface_init));

static const gchar* parser_mime_types[] = { "application/x-inlinepgp-encrypted",
                        NULL };

static GSList *
empe_inlinepgp_encrypted_parse (EMailParserExtension *extension,
                                EMailParser *parser,
                                CamelMimePart *part,
                                GString *part_id,
                                GCancellable *cancellable)
{
    CamelCipherContext *cipher;
    CamelCipherValidity *valid;
    CamelMimePart *opart;
    CamelDataWrapper *dw;
    gchar *mime_type;
    gint len;
    GError *local_error = NULL;
    GSList *parts, *iter;

    if (g_cancellable_is_cancelled (cancellable))
        return NULL;

    cipher = camel_gpg_context_new (e_mail_parser_get_session (parser));

    opart = camel_mime_part_new ();

    /* Decrypt the message */
    valid = camel_cipher_context_decrypt_sync (
        cipher, part, opart, cancellable, &local_error);

    if (!valid) {
        parts = e_mail_parser_error (
                parser, cancellable,
                _("Could not parse PGP message: %s"),
                local_error->message ?
                    local_error->message :
                    _("Unknown error"));
        g_clear_error (&local_error);

        parts = g_slist_concat (parts,
                e_mail_parser_parse_part_as (parser,
                    part, part_id,
                    "application/vnd.evolution.source",
                    cancellable));

        g_object_unref (cipher);
        g_object_unref (opart);
        return parts;
    }

    dw = camel_medium_get_content ((CamelMedium *) opart);
    mime_type = camel_data_wrapper_get_mime_type (dw);

    /* this ensures to show the 'opart' as inlined, if possible */
    if (mime_type && g_ascii_strcasecmp (mime_type, "application/octet-stream") == 0) {
        const gchar *snoop = e_mail_part_snoop_type (opart);

        if (snoop)
            camel_data_wrapper_set_mime_type (dw, snoop);
    }

    e_mail_part_preserve_charset_in_content_type (part, opart);
    g_free (mime_type);

    /* Pass it off to the real formatter */
    len = part_id->len;
    g_string_append (part_id, ".inlinepgp_encrypted");

    parts = e_mail_parser_parse_part_as (
            parser, opart, part_id,
            camel_data_wrapper_get_mime_type (dw), cancellable);

    g_string_truncate (part_id, len);

    for (iter = parts; iter; iter = iter->next) {
        EMailPart *mail_part;

        mail_part = iter->data;
        if (!mail_part)
            continue;

        e_mail_part_update_validity (mail_part, valid,
            E_MAIL_PART_VALIDITY_ENCRYPTED |
            E_MAIL_PART_VALIDITY_PGP);
    }

    /* Add a widget with details about the encryption, but only when
     * the encrypted isn't itself secured, in that case it has created
     * the button itself */
    if (!e_mail_part_is_secured (opart)) {
        GSList *button;
        EMailPart *mail_part;
        g_string_append (part_id, ".inlinepgp_encrypted.button");

        button = e_mail_parser_parse_part_as (
                parser, part, part_id,
                "application/vnd.evolution.widget.secure-button",
                cancellable);
        if (button && button->data) {
            mail_part = button->data;

            e_mail_part_update_validity (mail_part, valid,
                E_MAIL_PART_VALIDITY_ENCRYPTED |
                E_MAIL_PART_VALIDITY_PGP);
        }

        parts = g_slist_concat (parts, button);

        g_string_truncate (part_id, len);
    }

    /* Clean Up */
    camel_cipher_validity_free (valid);
    g_object_unref (opart);
    g_object_unref (cipher);

    return parts;
}

static const gchar **
empe_inlinepgp_encrypted_mime_types (EMailExtension *extension)
{
    return parser_mime_types;
}

static void
e_mail_parser_inline_pgp_encrypted_class_init (EMailParserInlinePGPEncryptedClass *klass)
{
    e_mail_parser_inline_pgp_encrypted_parent_class = g_type_class_peek_parent (klass);
}

static void
e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface)
{
    iface->parse = empe_inlinepgp_encrypted_parse;
}

static void
e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface)
{
    iface->mime_types = empe_inlinepgp_encrypted_mime_types;
}

static void
e_mail_parser_inline_pgp_encrypted_init (EMailParserInlinePGPEncrypted *parser)
{

}