This is currently mostly a wrapper around _notmuch_crypto_t that keeps
its internals private and doesn't expose any of the GMime API.
However, non-crypto indexing options might also be added later
(e.g. filters or other transformations).
---
 lib/add-message.cc    | 11 ++++++++++-
 lib/indexopts.c       | 22 ++++++++++++++++++++--
 lib/notmuch-private.h |  7 +++++++
 lib/notmuch.h         | 20 ++++++++++++++++++++
 4 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/lib/add-message.cc b/lib/add-message.cc
index bce10a0f..34099ed5 100644
--- a/lib/add-message.cc
+++ b/lib/add-message.cc
@@ -460,7 +460,7 @@ _notmuch_database_link_message (notmuch_database_t *notmuch,
 notmuch_status_t
 notmuch_database_index_file (notmuch_database_t *notmuch,
 			     const char *filename,
-			     notmuch_indexopts_t unused (*indexopts),
+			     notmuch_indexopts_t *indexopts,
 			     notmuch_message_t **message_ret)
 {
     notmuch_message_file_t *message_file;
@@ -468,6 +468,7 @@ notmuch_database_index_file (notmuch_database_t *notmuch,
     notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS, ret2;
     notmuch_private_status_t private_status;
     bool is_ghost = false, is_new = false;
+    notmuch_indexopts_t *def_indexopts = NULL;
 
     const char *date;
     const char *from, *to, *subject;
@@ -540,6 +541,11 @@ notmuch_database_index_file (notmuch_database_t *notmuch,
 	if (is_new || is_ghost)
 	    _notmuch_message_set_header_values (message, date, from, subject);
 
+	if (!indexopts) {
+	    def_indexopts = notmuch_database_get_default_indexopts (notmuch);
+	    indexopts = def_indexopts;
+	}
+
 	ret = _notmuch_message_index_file (message, message_file);
 	if (ret)
 	    goto DONE;
@@ -557,6 +563,9 @@ notmuch_database_index_file (notmuch_database_t *notmuch,
     }
 
   DONE:
+    if (def_indexopts)
+	notmuch_indexopts_destroy (def_indexopts);
+
     if (message) {
 	if ((ret == NOTMUCH_STATUS_SUCCESS ||
 	     ret == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID) && message_ret)
diff --git a/lib/indexopts.c b/lib/indexopts.c
index 2f9b841b..cc1d6422 100644
--- a/lib/indexopts.c
+++ b/lib/indexopts.c
@@ -21,9 +21,27 @@
 #include "notmuch-private.h"
 
 notmuch_indexopts_t *
-notmuch_database_get_default_indexopts (notmuch_database_t unused (*db))
+notmuch_database_get_default_indexopts (notmuch_database_t *db)
 {
-    return NULL;
+    return talloc_zero (db, notmuch_indexopts_t);
+}
+
+notmuch_status_t
+notmuch_indexopts_set_try_decrypt (notmuch_indexopts_t *indexopts,
+				   bool try_decrypt)
+{
+    if (!indexopts)
+	return NOTMUCH_STATUS_NULL_POINTER;
+    indexopts->crypto.decrypt = try_decrypt;
+    return NOTMUCH_STATUS_SUCCESS;
+}
+
+bool
+notmuch_indexopts_get_try_decrypt (const notmuch_indexopts_t *indexopts)
+{
+    if (!indexopts)
+	return false;
+    return indexopts->crypto.decrypt;
 }
 
 void
diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index e86f4582..4c408396 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -52,6 +52,7 @@ NOTMUCH_BEGIN_DECLS
 #include "xutil.h"
 #include "error_util.h"
 #include "string-util.h"
+#include "crypto.h"
 
 #ifdef DEBUG
 # define DEBUG_DATABASE_SANITY 1
@@ -633,6 +634,12 @@ _notmuch_thread_create (void *ctx,
 			notmuch_exclude_t omit_exclude,
 			notmuch_sort_t sort);
 
+/* indexopts.c */
+
+struct _notmuch_indexopts {
+    _notmuch_crypto_t crypto;
+};
+
 NOTMUCH_END_DECLS
 
 #ifdef __cplusplus
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 669e01b1..0b2e8305 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -42,6 +42,7 @@
 NOTMUCH_BEGIN_DECLS
 
 #include <time.h>
+#include <stdbool.h>
 
 #pragma GCC visibility push(default)
 
@@ -2214,6 +2215,25 @@ notmuch_config_list_destroy (notmuch_config_list_t *config_list);
 notmuch_indexopts_t *
 notmuch_database_get_default_indexopts (notmuch_database_t *db);
 
+/**
+ * Specify whether to decrypt encrypted parts while indexing.
+ *
+ * Be aware that the index is likely sufficient to reconstruct the
+ * cleartext of the message itself, so please ensure that the notmuch
+ * message index is adequately protected. DO NOT SET THIS FLAG TO TRUE
+ * without considering the security of your index.
+ */
+notmuch_status_t
+notmuch_indexopts_set_try_decrypt (notmuch_indexopts_t *indexopts,
+				   bool try_decrypt);
+
+/**
+ * Return whether to decrypt encrypted parts while indexing.
+ * see notmuch_indexopts_set_try_decrypt.
+ */
+bool
+notmuch_indexopts_get_try_decrypt (const notmuch_indexopts_t *indexopts);
+
 /**
  * Destroy a notmuch_indexopts_t object.
  *
-- 
2.14.2

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