static grpc_mdelem *client_recv_filter(void *user_data, grpc_mdelem *md) {
client_recv_filter_args *a = user_data;
if (md == GRPC_MDELEM_STATUS_200) {
return NULL;
} else if (md->key == GRPC_MDSTR_STATUS) {
char *message_string;
gpr_asprintf(&message_string, "Received http2 header with status: %s",
grpc_mdstr_as_c_string(md->value));
grpc_slice message = grpc_slice_from_copied_string(message_string);
gpr_free(message_string);
grpc_call_element_send_close_with_message(a->exec_ctx, a->elem,
GRPC_STATUS_CANCELLED, &message);
return NULL;
} else if (md->key == GRPC_MDSTR_GRPC_MESSAGE) {
grpc_slice pct_decoded_msg =
grpc_permissive_percent_decode_slice(md->value->slice);
if (grpc_slice_is_equivalent(pct_decoded_msg, md->value->slice)) {
grpc_slice_unref(pct_decoded_msg);
return md;
} else {
return grpc_mdelem_from_metadata_strings(
GRPC_MDSTR_GRPC_MESSAGE, grpc_mdstr_from_slice(pct_decoded_msg));
}
} else if (md == GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC) {
return NULL;
} else if (md->key == GRPC_MDSTR_CONTENT_TYPE) {
const char *value_str = grpc_mdstr_as_c_string(md->value);
if (strncmp(value_str, EXPECTED_CONTENT_TYPE,
EXPECTED_CONTENT_TYPE_LENGTH) == 0 &&
(value_str[EXPECTED_CONTENT_TYPE_LENGTH] == '+' ||
value_str[EXPECTED_CONTENT_TYPE_LENGTH] == ';')) {
/* Although the C implementation doesn't (currently) generate them,
any custom +-suffix is explicitly valid. */
/* TODO(klempner): We should consider preallocating common values such
as +proto or +json, or at least stashing them if we see them. */
/* TODO(klempner): Should we be surfacing this to application code? */
} else {
/* TODO(klempner): We're currently allowing this, but we shouldn't
see it without a proxy so log for now. */
gpr_log(GPR_INFO, "Unexpected content-type '%s'", value_str);
}
return NULL;
}
return md;
}
grpc_mdelem *grpc_mdelem_from_slices(grpc_mdctx *ctx, gpr_slice key,
gpr_slice value) {
return grpc_mdelem_from_metadata_strings(ctx, grpc_mdstr_from_slice(ctx, key),
grpc_mdstr_from_slice(ctx, value));
}