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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/http/client_authority_filter.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
#include "src/core/lib/surface/call.h"
#include "src/core/lib/surface/channel_init.h"
#include "src/core/lib/surface/channel_stack_type.h"
#include "src/core/lib/transport/static_metadata.h"
namespace {
struct call_data {
grpc_linked_mdelem authority_storage;
grpc_call_combiner* call_combiner;
};
struct channel_data {
grpc_slice default_authority;
};
void authority_start_transport_stream_op_batch(
grpc_call_element* elem, grpc_transport_stream_op_batch* batch) {
channel_data* chand = static_cast<channel_data*>(elem->channel_data);
call_data* calld = static_cast<call_data*>(elem->call_data);
// Handle send_initial_metadata.
auto* initial_metadata =
batch->payload->send_initial_metadata.send_initial_metadata;
// If the initial metadata doesn't already contain :authority, add it.
if (batch->send_initial_metadata &&
initial_metadata->idx.named.authority == nullptr) {
grpc_error* error = grpc_metadata_batch_add_head(
initial_metadata, &calld->authority_storage,
grpc_mdelem_from_slices(
GRPC_MDSTR_AUTHORITY,
grpc_slice_ref_internal(chand->default_authority)));
if (error != GRPC_ERROR_NONE) {
grpc_transport_stream_op_batch_finish_with_failure(batch, error,
calld->call_combiner);
return;
}
}
// Pass control down the stack.
grpc_call_next_op(elem, batch);
}
/* Constructor for call_data */
grpc_error* init_call_elem(grpc_call_element* elem,
const grpc_call_element_args* args) {
call_data* calld = static_cast<call_data*>(elem->call_data);
calld->call_combiner = args->call_combiner;
return GRPC_ERROR_NONE;
}
/* Destructor for call_data */
void destroy_call_elem(grpc_call_element* elem,
const grpc_call_final_info* final_info,
grpc_closure* ignored) {}
/* Constructor for channel_data */
grpc_error* init_channel_elem(grpc_channel_element* elem,
grpc_channel_element_args* args) {
channel_data* chand = static_cast<channel_data*>(elem->channel_data);
const grpc_arg* default_authority_arg =
grpc_channel_args_find(args->channel_args, GRPC_ARG_DEFAULT_AUTHORITY);
if (default_authority_arg == nullptr) {
return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"GRPC_ARG_DEFAULT_AUTHORITY channel arg. not found. Note that direct "
"channels must explicitly specify a value for this argument.");
}
const char* default_authority_str =
grpc_channel_arg_get_string(default_authority_arg);
if (default_authority_str == nullptr) {
return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"GRPC_ARG_DEFAULT_AUTHORITY channel arg. must be a string");
}
chand->default_authority =
grpc_slice_intern(grpc_slice_from_static_string(default_authority_str));
GPR_ASSERT(!args->is_last);
return GRPC_ERROR_NONE;
}
/* Destructor for channel data */
void destroy_channel_elem(grpc_channel_element* elem) {
channel_data* chand = static_cast<channel_data*>(elem->channel_data);
grpc_slice_unref_internal(chand->default_authority);
}
} // namespace
const grpc_channel_filter grpc_client_authority_filter = {
authority_start_transport_stream_op_batch,
grpc_channel_next_op,
sizeof(call_data),
init_call_elem,
grpc_call_stack_ignore_set_pollset_or_pollset_set,
destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_channel_next_get_info,
"authority"};
static bool add_client_authority_filter(grpc_channel_stack_builder* builder,
void* arg) {
const grpc_channel_args* channel_args =
grpc_channel_stack_builder_get_channel_arguments(builder);
const grpc_arg* disable_client_authority_filter_arg = grpc_channel_args_find(
channel_args, GRPC_ARG_DISABLE_CLIENT_AUTHORITY_FILTER);
if (disable_client_authority_filter_arg != nullptr) {
const bool is_client_authority_filter_disabled =
grpc_channel_arg_get_bool(disable_client_authority_filter_arg, false);
if (is_client_authority_filter_disabled) {
return true;
}
}
return grpc_channel_stack_builder_prepend_filter(
builder, static_cast<const grpc_channel_filter*>(arg), nullptr, nullptr);
}
void grpc_client_authority_filter_init(void) {
grpc_channel_init_register_stage(GRPC_CLIENT_SUBCHANNEL, INT_MAX,
add_client_authority_filter,
(void*)&grpc_client_authority_filter);
grpc_channel_init_register_stage(GRPC_CLIENT_DIRECT_CHANNEL, INT_MAX,
add_client_authority_filter,
(void*)&grpc_client_authority_filter);
}
void grpc_client_authority_filter_shutdown(void) {}
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