1 files changed, 252 insertions, 0 deletions
diff --git a/em-format/e-mail-parser-multipart-signed.c b/em-format/e-mail-parser-multipart-signed.c
new file mode 100644
index 0000000000..37bedc91f0
--- /dev/null
+++ b/em-format/e-mail-parser-multipart-signed.c
@@ -0,0 +1,252 @@
+/*
+ * e-mail-parser-multipart-signed.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 <glib/gi18n-lib.h>
+#include <camel/camel.h>
+
+typedef struct _EMailParserMultipartSigned {
+	GObject parent;
+} EMailParserMultipartSigned;
+
+typedef struct _EMailParserMultipartSignedClass {
+	GObjectClass parent_class;
+} EMailParserMultipartSignedClass;
+
+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 (
+	EMailParserMultipartSigned,
+	e_mail_parser_multipart_signed,
+	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[] = { "multipart/signed",
+					    "application/pgp-signature",
+					    NULL };
+
+static GSList *
+empe_mp_signed_parse (EMailParserExtension *extension,
+                      EMailParser *parser,
+                      CamelMimePart *part,
+                      GString *part_id,
+                      GCancellable *cancellable)
+{
+	CamelMimePart *cpart;
+	CamelMultipartSigned *mps;
+	CamelCipherContext *cipher = NULL;
+	CamelSession *session;
+	guint32 validity_type;
+	GSList *parts;
+	CamelCipherValidity *valid;
+	GError *local_error = NULL;
+	gint i, nparts, len;
+	gboolean secured;
+
+	if (g_cancellable_is_cancelled (cancellable))
+		return NULL;
+
+	/* If the part is application/pgp-signature sub-part then skip it. */
+	if (!CAMEL_IS_MULTIPART (part)) {
+		CamelContentType *ct;
+		ct = camel_mime_part_get_content_type (CAMEL_MIME_PART (part));
+		if (camel_content_type_is (ct, "application", "pgp-signature")) {
+			return g_slist_alloc ();
+		}
+	}
+
+	mps = (CamelMultipartSigned *) camel_medium_get_content ((CamelMedium *) part);
+	if (!CAMEL_IS_MULTIPART_SIGNED (mps)
+	    || (cpart = camel_multipart_get_part ((CamelMultipart *) mps,
+		CAMEL_MULTIPART_SIGNED_CONTENT)) == NULL) {
+		parts = e_mail_parser_error (
+				parser, cancellable,
+				_("Could not parse MIME message. "
+				"Displaying as source."));
+
+		parts = g_slist_concat (parts,
+				e_mail_parser_parse_part_as (
+					parser, part, part_id,
+					"application/vnd.evolution.source",
+					cancellable));
+		return parts;
+	}
+
+	session = e_mail_parser_get_session (parser);
+	/* FIXME: Should be done via a plugin interface */
+	/* FIXME: duplicated in em-format-html-display.c */
+	if (mps->protocol) {
+#ifdef ENABLE_SMIME
+		if (g_ascii_strcasecmp("application/x-pkcs7-signature", mps->protocol) == 0
+		    || g_ascii_strcasecmp("application/pkcs7-signature", mps->protocol) == 0) {
+			cipher = camel_smime_context_new (session);
+			validity_type = E_MAIL_PART_VALIDITY_SMIME;
+		} else {
+#endif
+			if (g_ascii_strcasecmp("application/pgp-signature", mps->protocol) == 0) {
+				cipher = camel_gpg_context_new (session);
+				validity_type = E_MAIL_PART_VALIDITY_PGP;
+			}
+#ifdef ENABLE_SMIME
+		}
+#endif
+	}
+
+	if (cipher == NULL) {
+		parts = e_mail_parser_error (
+				parser, cancellable,
+				_("Unsupported signature format"));
+
+		parts = g_slist_concat (parts,
+				e_mail_parser_parse_part_as (
+					parser, part, part_id,
+				 	"multipart/mixed", cancellable));
+
+		return parts;
+	}
+
+	valid = camel_cipher_context_verify_sync (
+		cipher, part, cancellable, &local_error);
+	if (valid == NULL) {
+		parts = e_mail_parser_error (
+				parser, cancellable,
+				_("Error verifying signature: %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,
+					"multipart/mixed", cancellable));
+
+		g_object_unref (cipher);
+		return parts;
+	}
+
+	nparts = camel_multipart_get_number (CAMEL_MULTIPART (mps));
+	secured = FALSE;
+	len = part_id->len;
+	parts = NULL;
+	for (i = 0; i < nparts; i++) {
+		CamelMimePart *subpart;
+		GSList *mail_parts, *iter;
+		subpart = camel_multipart_get_part (CAMEL_MULTIPART (mps), i);
+
+		g_string_append_printf(part_id, ".signed.%d", i);
+
+		mail_parts = e_mail_parser_parse_part (
+				parser, subpart, part_id, cancellable);
+
+		g_string_truncate (part_id, len);
+
+		if (!secured)
+			secured = e_mail_part_is_secured (subpart);
+
+		for (iter = mail_parts; iter; iter = iter->next) {
+			EMailPart *mail_part;
+
+			mail_part = iter->data;
+			if (!mail_part)
+				continue;
+
+			e_mail_part_update_validity (mail_part, valid,
+				validity_type | E_MAIL_PART_VALIDITY_SIGNED);
+		}
+
+		parts = g_slist_concat (parts, mail_parts);
+	}
+
+	/* 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 (!secured) {
+		GSList *button;
+		EMailPart *mail_part;
+		g_string_append (part_id, ".signed.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,
+				validity_type | E_MAIL_PART_VALIDITY_SIGNED);
+		}
+
+		parts = g_slist_concat (parts, button);
+
+		g_string_truncate (part_id, len);
+	}
+
+	camel_cipher_validity_free (valid);
+
+	g_object_unref (cipher);
+
+	return parts;
+}
+
+static const gchar **
+empe_mp_signed_mime_types (EMailExtension *extension)
+{
+	return parser_mime_types;
+}
+
+static void
+e_mail_parser_multipart_signed_class_init (EMailParserMultipartSignedClass *klass)
+{
+	e_mail_parser_multipart_signed_parent_class = g_type_class_peek_parent (klass);
+}
+
+static void
+e_mail_parser_parser_extension_interface_init (EMailParserExtensionInterface *iface)
+{
+	iface->parse = empe_mp_signed_parse;
+}
+
+static void
+e_mail_parser_mail_extension_interface_init (EMailExtensionInterface *iface)
+{
+	iface->mime_types = empe_mp_signed_mime_types;
+}
+
+static void
+e_mail_parser_multipart_signed_init (EMailParserMultipartSigned *parser)
+{
+
+}