Merge branch 'master' of github.com:grpc/grpc into core_creds_plugin
diff --git a/include/grpc/grpc_security.h b/include/grpc/grpc_security.h
index 87bc250..34f7eab 100644
--- a/include/grpc/grpc_security.h
+++ b/include/grpc/grpc_security.h
@@ -131,6 +131,32 @@
const char *authorization_token, const char *authority_selector,
void *reserved);
+/* Callback function to be called by the metadata credentials plugin
+ implementation when the metadata is ready. */
+typedef void (*grpc_credentials_plugin_metadata_cb)(
+ void *user_data, const grpc_metadata *creds_md, size_t num_creds_md,
+ grpc_status_code status, const char *error_details);
+
+typedef struct {
+ /* The implementation of this method has to be non-blocking.
+ - service_url is the fully qualified URL that the client stack is
+ connecting to.
+ - cb is the callback that needs to be called when the metadata is ready.
+ - user_data needs to be passed as the first parameter of the callback. */
+ void (*get_metadata)(void *state, const char *service_url,
+ grpc_credentials_plugin_metadata_cb cb, void *user_data);
+
+ /* Destroys the plugin state. */
+ void (*destroy)(void *state);
+
+ /* State that will be set as the first parameter of the methods above. */
+ void *state;
+} grpc_metadata_credentials_plugin;
+
+/* Creates a credentials object
+grpc_credentials *grpc_metadata_credentials_create_from_plugin(
+ grpc_metadata_credentials_plugin plugin, void *reserved);
+
/* --- Secure channel creation. --- */
/* Creates a secure channel using the passed-in credentials. */