void

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025MONGOC_CLIENT_ENCRYPTI...TIAL_PROVIDER_CALLBACK(3)

       • opts - The options object to update.

       • fn  -  The provider callback to set on the options object. May be NULL to clear the callback. Refer to:
         mongoc_kms_credentials_provider_callback_fn

       • userdata - An arbitrary pointer that will be passed along to the callback function when it is called by
         libmongoc.

       SEEALSO:mongoc_auto_encryption_opts_set_kms_credential_provider_callback()

       Related:

       typemongoc_kms_credentials_provider_callback_fn

                 typedef
                 bool (*mongoc_kms_credentials_provider_callback_fn) (void *userdata,
                                                                      const bson_t *params,
                                                                      bson_t *out,
                                                                      bson_error_t *error);

              The type of a callback function for providing KMS providers data on-demand.

              Parameters

                     • userdata - The same userdata pointer provided to the userdata parameter when the callback
                       was set.

                     • params - Parameters for the requested KMS credentials. Currently empty.

                     • out - The output bson_t in which to write the new  KMS  providers.  When  passed  to  the
                       callback, this already points to an empty BSON document which must be populated.

                     • error  -  An output parameter for indicating any errors that might occur while generating
                       the KMS credentials.

              Returnvalue
                     Must return true on success, false on failure.

          void
          mongoc_client_encryption_opts_set_kms_credential_provider_callback (
            mongoc_client_encryption_opts_t *opts,
            mongoc_kms_credentials_provider_callback_fn fn,
            void *userdata);

       Set the user-provided callback to provide KMS credentials on-demand when they are needed.