Add signature verification of PGP/MIME-signed parts with --verify.

This is primarily for notmuch-show, although the functionality is
added to show-message.  Once signatures are processed a new
part_sigstatus formatter is emitted, and the entire multipart/signed
part is replaced with the contents of the signed part.

At the moment only a json part_sigstatus formatting function is
available.  Emacs support to follow.

The original work for this patch was done by

  Daniel Kahn Gillmor <dkg@fifthhorseman.net>

whose help with this functionality I greatly appreciate.

1 files changed, 49 insertions, 0 deletions

diff --git a/notmuch-gmime-session.c b/notmuch-gmime-session.c
new file mode 100644
index 00000000..d83d9b3d
--- /dev/null
+++ b/notmuch-gmime-session.c
@@ -0,0 +1,49 @@
+#include "notmuch-client.h"
+
+/* CRUFTY BOILERPLATE for GMimeSession (dkg thinks this will go away once GMime 2.6 comes out) */
+typedef struct _NotmuchGmimeSession NotmuchGmimeSession;
+typedef struct _NotmuchGmimeSessionClass NotmuchGmimeSessionClass;
+
+struct _NotmuchGmimeSession {
+    GMimeSession parent_object;
+};
+
+struct _NotmuchGmimeSessionClass {
+    GMimeSessionClass parent_class;
+};
+
+static void notmuch_gmime_session_class_init (NotmuchGmimeSessionClass *klass);
+
+static GMimeSessionClass *parent_class = NULL;
+
+GType
+notmuch_gmime_session_get_type (void)
+{
+    static GType type = 0;
+
+    if (!type) {
+	static const GTypeInfo info = {
+	    sizeof (NotmuchGmimeSessionClass),
+	    NULL, /* base_class_init */
+	    NULL, /* base_class_finalize */
+	    (GClassInitFunc) notmuch_gmime_session_class_init,
+	    NULL, /* class_finalize */
+	    NULL, /* class_data */
+	    sizeof (NotmuchGmimeSession),
+	    0,    /* n_preallocs */
+	    NULL, /* object_init */
+	    NULL, /* value_table */
+	};
+	type = g_type_register_static (GMIME_TYPE_SESSION, "NotmuchGmimeSession", &info, 0);
+    }
+    return type;
+}
+
+static void
+notmuch_gmime_session_class_init (NotmuchGmimeSessionClass *klass)
+{
+    GMimeSessionClass *session_class = GMIME_SESSION_CLASS (klass);
+    parent_class = g_type_class_ref (GMIME_TYPE_SESSION);
+    session_class->request_passwd = NULL;
+}
+/* END CRUFTY BOILERPLATE */