/*

 * e-mail-parser-multipart-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.

 *

 * 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/>.

 *

 */

#include "evolution-config.h"

#include <glib/gi18n-lib.h>

#include <libedataserver/libedataserver.h>

#include "e-mail-formatter-utils.h"

#include "e-mail-parser-extension.h"

#include "e-mail-part-utils.h"

typedef EMailParserExtension EMailParserMultipartEncrypted;

typedef EMailParserExtensionClass EMailParserMultipartEncryptedClass;

GType e_mail_parser_multipart_encrypted_get_type (void);

G_DEFINE_TYPE (

	EMailParserMultipartEncrypted,

	e_mail_parser_multipart_encrypted,

	E_TYPE_MAIL_PARSER_EXTENSION)

static const gchar *parser_mime_types[] = {

	"multipart/encrypted",

	NULL

};

static gboolean

empe_mp_encrypted_parse (EMailParserExtension *extension,

                         EMailParser *parser,

                         CamelMimePart *part,

                         GString *part_id,

                         GCancellable *cancellable,

                         GQueue *out_mail_parts)

{

	CamelCipherContext *context;

	const gchar *protocol;

	CamelMimePart *opart;

	CamelCipherValidity *valid;

	CamelMultipartEncrypted *mpe;

	GQueue work_queue = G_QUEUE_INIT;

	GList *head, *link;

	GError *local_error = NULL;

	gint len;

	mpe = (CamelMultipartEncrypted *) camel_medium_get_content ((CamelMedium *) part);

	if (!CAMEL_IS_MULTIPART_ENCRYPTED (mpe)) {

		e_mail_parser_error (

			parser, out_mail_parts,

			_("Could not parse MIME message. "

			"Displaying as source."));

		e_mail_parser_parse_part_as (

			parser, part, part_id,

			"application/vnd.evolution/source",

			cancellable, out_mail_parts);

		return TRUE;

	}

	/* Currently we only handle RFC2015-style PGP encryption. */

	protocol = camel_content_type_param (camel_data_wrapper_get_mime_type_field (CAMEL_DATA_WRAPPER (mpe)), "protocol");

	if (!protocol || g_ascii_strcasecmp (protocol, "application/pgp-encrypted") != 0) {

		e_mail_parser_error (

			parser, out_mail_parts,

			_("Unsupported encryption type for multipart/encrypted"));

		e_mail_parser_parse_part_as (

			parser, part, part_id, "multipart/mixed",

			cancellable, out_mail_parts);

		return TRUE;

	}

	context = camel_gpg_context_new (e_mail_parser_get_session (parser));

	opart = camel_mime_part_new ();

	valid = camel_cipher_context_decrypt_sync (

		context, part, opart, cancellable, &local_error);

	e_mail_part_preserve_charset_in_content_type (part, opart);

	if (local_error != NULL) {

		e_mail_parser_error (

			parser, out_mail_parts,

			_("Could not parse PGP/MIME message: %s"),

			local_error->message);

		e_mail_parser_parse_part_as (

			parser, part, part_id, "multipart/mixed",

			cancellable, out_mail_parts);

		g_object_unref (opart);

		g_object_unref (context);

		g_error_free (local_error);

		return TRUE;

	}

	len = part_id->len;

	g_string_append (part_id, ".encrypted");

	g_warn_if_fail (e_mail_parser_parse_part (

		parser, opart, part_id, cancellable, &work_queue));

	g_string_truncate (part_id, len);

	head = g_queue_peek_head_link (&work_queue);

	/* Update validity of all encrypted sub-parts */

	for (link = head; link != NULL; link = g_list_next (link)) {

		EMailPart *mail_part = link->data;

		e_mail_part_update_validity (

			mail_part, valid,

			E_MAIL_PART_VALIDITY_ENCRYPTED |

			E_MAIL_PART_VALIDITY_PGP);

		/* Do not traverse sub-messages */

		if (g_str_has_suffix (e_mail_part_get_id (mail_part), ".rfc822"))

			link = e_mail_formatter_find_rfc822_end_iter (link);

	}

	e_queue_transfer (&work_queue, out_mail_parts);

	/* Add a widget with details about the encryption, but only when

	 * the decrypted part isn't itself secured, in that case it has

	 * created the button itself. */

	if (!e_mail_part_is_secured (opart)) {

		EMailPart *mail_part;

		g_string_append (part_id, ".encrypted.button");

		e_mail_parser_parse_part_as (

			parser, part, part_id,

			"application/vnd.evolution.secure-button",

			cancellable, &work_queue);

		mail_part = g_queue_peek_head (&work_queue);

		if (mail_part != NULL)

			e_mail_part_update_validity (

				mail_part, valid,

				E_MAIL_PART_VALIDITY_ENCRYPTED |

				E_MAIL_PART_VALIDITY_PGP);

		e_queue_transfer (&work_queue, out_mail_parts);

		g_string_truncate (part_id, len);

	}

	camel_cipher_validity_free (valid);

	/* TODO: Make sure when we finalize this part, it is zero'd out */

	g_object_unref (opart);

	g_object_unref (context);

	return TRUE;

}

static void

e_mail_parser_multipart_encrypted_class_init (EMailParserExtensionClass *class)

{

	class->mime_types = parser_mime_types;

	class->priority = G_PRIORITY_LOW;

	class->parse = empe_mp_encrypted_parse;

}

static void

e_mail_parser_multipart_encrypted_init (EMailParserExtension *extension)

{

}