[PATCH 4/9] Add new n_d_add_message_try_decrypt (analogous to to n_d_add_message)

[Daniel Kahn Gillmor <dkg@fifthhorseman.net>]

When adding a message to the database, optionally try to decrypt the
message and index the cleartext.

Note that when a message is retrieved from the database, it will not
have this flag attached to it necessarily (though users can inspect
the tags that were attached during decryption/indexing)
---
 lib/database.cc | 31 ++++++++++++++++++++++++++++---
 lib/notmuch.h   | 19 +++++++++++++++++++
 2 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/lib/database.cc b/lib/database.cc
index 13b0bad..62bc6d9 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -2429,9 +2429,10 @@ _notmuch_database_get_crypto_for_protocol (notmuch_database_t *notmuch,
 }
 
 notmuch_status_t
-notmuch_database_add_message (notmuch_database_t *notmuch,
-			      const char *filename,
-			      notmuch_message_t **message_ret)
+_notmuch_database_add_message_with_options (notmuch_database_t *notmuch,
+					    const char *filename,
+					    notmuch_bool_t decrypt,
+					    notmuch_message_t **message_ret)
 {
     notmuch_message_file_t *message_file;
     notmuch_message_t *message = NULL;
@@ -2550,6 +2551,8 @@ notmuch_database_add_message (notmuch_database_t *notmuch,
 	    date = _notmuch_message_file_get_header (message_file, "date");
 	    _notmuch_message_set_header_values (message, date, from, subject);
 
+	    notmuch_message_set_flag (message, NOTMUCH_MESSAGE_FLAG_INDEX_DECRYPTED, decrypt);
+
 	    ret = _notmuch_message_index_file (message, message_file);
 	    if (ret)
 		goto DONE;
@@ -2587,6 +2590,28 @@ notmuch_database_add_message (notmuch_database_t *notmuch,
     return ret;
 }
 
+
+notmuch_status_t
+notmuch_database_add_message (notmuch_database_t *notmuch,
+			      const char *filename,
+			      notmuch_message_t **message_ret)
+{
+    return _notmuch_database_add_message_with_options (notmuch, filename,
+						       false,
+						       message_ret);
+    
+}
+notmuch_status_t
+notmuch_database_add_message_try_decrypt (notmuch_database_t *notmuch,
+					  const char *filename,
+					  notmuch_message_t **message_ret)
+{
+    return _notmuch_database_add_message_with_options (notmuch, filename,
+						       true,
+						       message_ret);
+    
+}
+
 notmuch_status_t
 notmuch_database_remove_message (notmuch_database_t *notmuch,
 				 const char *filename)
diff --git a/lib/notmuch.h b/lib/notmuch.h
index e7085b7..809a2ea 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -570,6 +570,25 @@ notmuch_status_t
 notmuch_database_add_message (notmuch_database_t *database,
 			      const char *filename,
 			      notmuch_message_t **message);
+/**
+ * Add a new message to the given notmuch database or associate an
+ * additional filename with an existing message.
+ * 
+ * This does the same thing as notmuch_database_add_message except
+ * that it if part of the message is encrypted, it also tries to
+ * decrypt the message and index the cleartext version if it can.
+ * 
+ * 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 USE THIS FUNCTION
+ * without considering the security of your index.
+ * 
+ * FIXME: document new error codes here.
+ */
+notmuch_status_t
+notmuch_database_add_message_try_decrypt (notmuch_database_t *database,
+					  const char *filename,
+					  notmuch_message_t **message);
 
 /**
  * Remove a message filename from the given notmuch database. If the
-- 
2.6.2