cli: new crypto structure to store crypto contexts and parameters, and functions...

[notmuch] / crypto.c

diff --git a/crypto.c b/crypto.c
new file mode 100644 (file)
index 0000000..fbe5aeb
--- /dev/null
+++ b/crypto.c
@@ -0,0 +1,71 @@
+/* notmuch - Not much of an email program, (just index and search)
+ *
+ * Copyright © 2012 Jameson Rollins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 General Public License
+ * along with this program.  If not, see http://www.gnu.org/licenses/ .
+ *
+ * Authors: Jameson Rollins <jrollins@finestructure.net>
+ */
+
+#include "notmuch-client.h"
+
+/* for the specified protocol return the context pointer (initializing
+ * if needed) */
+notmuch_crypto_context_t *
+notmuch_crypto_get_context (notmuch_crypto_t *crypto, const char *protocol)
+{
+    notmuch_crypto_context_t *cryptoctx = NULL;
+
+    /* As per RFC 1847 section 2.1: "the [protocol] value token is
+     * comprised of the type and sub-type tokens of the Content-Type".
+     * As per RFC 1521 section 2: "Content-Type values, subtypes, and
+     * parameter names as defined in this document are
+     * case-insensitive."  Thus, we use strcasecmp for the protocol.
+     */
+    if ((strcasecmp (protocol, "application/pgp-signature") == 0)
+       || (strcasecmp (protocol, "application/pgp-encrypted") == 0)) {
+       if (!crypto->gpgctx) {
+#ifdef GMIME_ATLEAST_26
+           /* TODO: GMimePasswordRequestFunc */
+           crypto->gpgctx = g_mime_gpg_context_new (NULL, "gpg");
+#else
+           GMimeSession* session = g_object_new (g_mime_session_get_type(), NULL);
+           crypto->gpgctx = g_mime_gpg_context_new (session, "gpg");
+           g_object_unref (session);
+#endif
+           if (crypto->gpgctx) {
+               g_mime_gpg_context_set_always_trust ((GMimeGpgContext*) crypto->gpgctx, FALSE);
+           } else {
+               fprintf (stderr, "Failed to construct gpg context.\n");
+           }
+       }
+       cryptoctx = crypto->gpgctx;
+
+    } else {
+       fprintf (stderr, "Unknown or unsupported cryptographic protocol.\n");
+    }
+
+    return cryptoctx;
+}
+
+int
+notmuch_crypto_cleanup (notmuch_crypto_t *crypto)
+{
+    if (crypto->gpgctx) {
+       g_object_unref (crypto->gpgctx);
+       crypto->gpgctx = NULL;
+    }
+
+    return 0;
+}